Reviewer #3 (Public Review):

The main goals of this study by Guan, Aflalo and colleagues were to examine the encoding scheme of populations of neurons in the posterior parietal cortex (PPC) of a person with paralysis while she attempted individual finger movements as part of a brain-computer interface task (BCI). They used these data to answer several questions:

1) Could they decode attempted finger movements from these data (building on this group's prior work decoding a variety of movements, including arm movements, from PPC)?

2) Is there evidence that the encoding scheme for these movements is similar to that of able-bodied individuals, which would argue that even after paralysis, this area is not reorganized and that the motor representations remain more or less stable after the injury?

3) Related to #2: is there beneficial remapping, such that neural correlates of attempted movements change to improve BCI performance over time?

4) Can looking at the interrelationship between different fingers' population firing rate patterns (one aspect of the encoding scheme) indicate whether the representation structure is similar to the statistics of natural finger use, a somatotopic organization (how close the fingers are to each other), or be uniformly different from one another (which would be advantageous for the BCI and connects to question #3)? Furthermore, does the best fit amongst these choices to the data change over the course of a movement, indicating a time-varying neural encoding structure or multiple overlapping processes?

The study is well-conducted and uses sound analysis methods, and is able to contribute some new knowledge related to all of the above questions. These are rare and precious data, given the relatively few people implanted with multielectrode arrays like the Utah arrays used in this study. Even more so when considering that to this reviewer's knowledge, no other group is recording from PPC, and this manuscript thus is the first look at the attempted finger moving encoding scheme in this part of human cortex .

An important caveat is that the representational similarity analysis (RDA) method and resulting representational dissimilarity matrix (RDM) that is the workhorse analysis/metric throughout the study is capturing a fairly specific question: which pairs of finger movements' neural correlates are more/less similar, and how does that pattern across the pairings compare to other datasets. There are other questions that one could ask with these data (and perhaps this group will in subsequent studies), which will provide additional information about the encoding; for example, how well does the population activity correlate with the kinematics, kinetics, and predicted sensory feedback that would accompany such movements in an able-bodied person?

What this study shows is that the RDMs from these PPC Utah array data are most similar to motor cortical RDMs based on a prior fMRI study. It's innovative to compare effectors' representational similarity across different recording modalities, but this apparent similarity should be interpreted in light of several limitations: 1) the vastly different spatial scales (voxels spanning cm that average activity of millions of neurons each versus a few mm of cortex with sparse sampling of individual neurons, 2) the vastly different temporal scales (firing rates versus blood flow), 3) that dramatically different encoding schemes and dynamics could still result in the same RDMs. As currently written, the study does not adequately caveat the relatively superficial and narrow similarity being made between these data and the prior Ejaz et al (2015) sensorimotor cortex fMRI results before except for (some) exposition in the Discussion.

Relatedly, the study would benefit from additional explanation for why the comparison is being made to able-bodied fMRI data, rather than similar intracortical neural recordings made in homologous areas of non-human primates (NHPs), which have been traditionally used as an animal model for vision-guided forelimb reaching. This group has an illustrious history of such macaque studies, which makes this omission more surprising.

A second area in which the manuscript in its current form could better set the context for its reader is in how it introduces their motivating question of "do paralyzed BCI users need to learn a fundamentally new skillset, or can they leverage their pre-injury motor repertoire". Until the Discussion, there is almost no mention of the many previous human BCI studies where high performance movement decoding was possible based on asking participants to attempt to make arm or hand movements (to just list a small number of the many such studies: Hochberg et al 2006 and 2012, Collinger et al 2013, Gilja et al 2015, Bouton et al 2016, Ajiboye*, Willett* et al 2017; Brandman et al 2018; Willett et al 2020; Flesher et al 2021). This is important; while most of these past studies examined motor (and somatosensory) cortex and not PPC (though this group's prior Aflalo*, Kellis* et al 2015 study did!), they all did show that motor representations remain at least distinct enough between movements to allow for decoding; were qualitatively similar to the able-bodied animal studies upon which that body of work was build; and could be readily engaged by the user just by attempting/imagining a movement. Thus, there was a very strong expectation going into this present study that the result would be that there would be a resemblance to able-bodied motor representational similarity. While explicitly making this connection is a meaningful contribution to the literature by the present study (and so is comparing it to different areas' representational similarity), care should be taken not to overstate the novelty of retained motor encoding schemes in people with paralysis, given the extensive prior work.

The final analyses in the manuscript are particularly interesting: they examine the representational structure as a function of a short sliding analysis window, which indicates that there is a more motoric representational structure at the start of the movement, followed by a more somatotopic structure. These analyses are a welcome expansion of the study scope to include the population dynamics, and provides clues as to the role of this activity / the computations this area is involved in throughout movement (e.g., the authors speculate the initial activity is an efference copy from motor cortex, and the later activity is a sensory-consequence model).

An interesting result in this study is that the participant did not improve performance at the task (and that the neural representations of each finger did not change to become more separable by the decoder). This was despite ample room for improvement (the performance was below 90% accuracy across 5 possible choices), at least not over 4,016 trials. The authors provide several possible explanations for this in the Discussion. Another possibility is that the nature of the task impeded learning because feedback was delayed until the end of the 1.5 second attempted movement period (at which time the participant was presented with text reporting which finger's movement was decoded). This is a very different discrete-and-delayed paradigm from the continuous control used in prior NHP BCI studies that showed motor learning (e.g., Sadtler et al 2014 and follow-ups; Vyas et al 2018 and follow-up; Ganguly & Carmena 2009 and follow-ups). It is possible that having continuous visual feedback about the BCI effector is more similar to the natural motor system (where there is consistent visual, as well as proprioceptive and somatosensory feedback about movements), and thus better engages motor adaptation/learning mechanisms.

Overall the study contributes to the state of knowledge about human PPC cortex and its neurophysiology even years after injury when a person attempts movements. The methods are sound, but are unlikely (in this reviewer's view) to be widely adopted by the community. Two specific contributions of this study are 1) that it provides an additional data point that motor representations are stable after injury, lowering the risk of BCI strategies based on PPC recording; and 2) that it starts the conversation about how to make deeper comparisons between able-bodied neural dynamics and those of people unable to make overt movements.

Reviewer #3 (Public Review):

Childhood acute myeloid leukemia (AML) is a heterogeneous disease with different outcomes for different patients, making identifying patients with different prognoses for clinical management. A variety of approaches have been used to stratify AML patients' risk, including molecular and clinical measurements to build prognostic risk scores. Previously, Chaudhary et al found that mitochondrial genome copy number per AML cell could stratify patients who would have good and poor outcomes and survival. This interesting finding suggested that mitochondrial amount and/or function alter AML disease course and suggested a further in-depth study of mitochondria in AML.

Chaudhary and colleagues follow up their preliminary study on mitochondrial genome copy number in AML with this current study by looking if the expression of specific genes encoding mitochondrial components could provide further insight into AML prognosis. The authors collected childhood AML patient samples and grouped them based on mitochondrial genome copy number. They then performed transcriptomic analysis and identified a number of nuclear-encoded mitochondrial component genes whose expression was correlated or anticorrelated with mitochondrial genome copy number and this was confirmed with targeted analysis of identified transcripts in validation cohorts. Multivariate analysis was used to identify those genes whose expression was prognostic of patient outcome. This led to the identification of three mitochondrial genes (SDHC, CLIC1, SLC25A29) whose expression was used to build a multivariate risk model for childhood AML patients. The risk model based on the expression of these genes outperformed currently used ELN risk stratification and could be combined with ELN to increase prognostic power. Lastly, the authors used publically available data from adult AML patients and found that their risk score also had prognostic power in adult AML patients as well.

Altogether, the work by Chaudhary and colleagues interestingly builds on their previous work and suggests that mitochondria may influence AML outcomes, and measuring mitochondrial parameters may help assess patient risk. Numerous exciting questions remain: what outputs of the mitochondria influence AML disease course and how? Why are some mitochondrial genes but not others correlated with mitochondrial DNA copy number in AML cells and how does this influence mitochondrial properties? Outside of predicting patient risk, can the mitochondrial phenotype of AML cells predict effective therapies? How does the mitochondrial risk model perform compared to and when utilized with other transcriptional-based risk stratification models proposed in the literature?

Reviewer #3 (Public Review):

In their previous work, the authors studied the problem of clonal life cycles evolution. Here they extended the previous work by developing a model that describes such evolution under the presence of competition between groups. The model is studied using a combination of analytical methods and numerical simulations. The results obtained are more biologically justifiable than those obtained in the linear model that neglects competition between groups.

Strengths:

- As is known from previous work, in a linear model (when the competition is absent), a typical outcome is an exponential growth in the number of groups of some life cycle, which can be considered as a natural limitation of the model. Obviously, this limitation is removed in the presented paper.

- The authors provide analytical results for some special cases of the model and compare them with those obtained in the absence of competition. In the general case of the model, when analytical progress is impossible, the authors provide the results of extensive numerical simulations. All these results allow the authors to build a clear picture of the process under study.

- The authors study the evolutionary stability of various life cycles. Specifically, it was shown that only binary fragmentation life cycles can be evolutionary stable strategies. This result holds in the linear model as well. In contrast to the linear model, more complex dynamics can be observed in the general case (like the existence of several evolutionary stable strategies).

Overall, in my opinion, the model significantly contributes to our understanding of the evolution of clonal life cycles. Moreover, it illuminates to what extent are adequate the results of simple linear models in describing the processes under consideration.

Reviewer #3 (Public Review):

In this manuscript, the authors investigated the role of glutamine metabolism in chondrocytes and in the context of inflammation. Thus, they report that chondrocytes use glutamine for their energy production and anabolic functions. Moreover, they found that removal of glutamine resulted in metabolic reprogramming and decreased inflammatory response of chondrocytes. They attributed this anti-inflammatory response to decreased NF-κB activity. Moreover, the removal of glutamine promoted autophagy. This is a very interesting study and the vast majority of the conclusions are supported by strong data.

Reviewer #3 (Public Review):

The authors present a modular computational workflow for automated sample screening and collection of cryo-EM data and demonstrate its use for screening and 3D structure determination of human mitochondrial DNA polymerase as a test sample. Despite major advances in automation of microscope operation, optimising and screening sample conditions for the acquisition of high-quality data is still a laborious task that involves human input to navigate low-, medium- and high-magnification images to identify and select specimen areas amenable to high-resolution structure determination; and subjective tuning of parameters that can result in inefficient use of high-end cryo-TEM equipment. Fully automated methods for screening and data collection are therefore needed to meet the increasing demand for access and throughput of cryo-EM. Utilising deep-learning-based object detection algorithms, the authors show that their pre-trained models can effectively detect, classify, and rank regions (grid squares and holes) of interest based on established criteria such as contamination, support film integrity, and ice thickness. A challenge for any such method is the scarcity of annotated data reflecting the broad variety across the wide range of image and sample conditions in cryo-EM, and that selection of the "best" areas may vary by particle and sample preparation conditions. To mitigate this risk, the authors provide a web interface that allows re-training of the feature models and integrates on-the-fly assessment of data quality and adjustment of data collection parameters. As such, the presented pipeline and related approaches can become a useful addition to existing automation software for cryo-EM data collection, in multi-user environments such as cryo-EM facilities. Such approaches will best strive if software and models are openly available to the cryo-EM community so that annotated data can be added or customised and the quality of the prediction methods can improve over time.

Reviewer #3 (Public Review):

In general, I find this to be an experimentally and analytically sound paper. The observation that rate information is preserved in hippocampal replay is hinted at in previous work, but to my knowledge, has not yet been explicitly quantified as the authors have done here. Thus, this work is novel and, in my opinion, an important contribution to our understanding of hippocampal network function.

The large number of control analyses strongly support the core finding of this work. I feel that the authors have very convincingly demonstrated that rate information is represented along with spatial information in replay.

While I can think of many suggestions to follow up on this work, I have no major concerns regarding the experiments, analyses, or interpretation of the manuscript.

Reviewer #3 (Public Review):

The TRPV1 receptor channel is primarily localised to sensory nerves as well as other non-neuronal tissues. It has been known for some time that TRPV1 has a role in the regulation of body temperature, as TRPV1 antagonists, being developed as analgesics, cause hyperthermia. There is a need for further mechanistic information, as the present drug discovery programme has been delayed by the inability of scientists to develop TRPV1 analgesics that act without temperature-related side effects. This manuscript is designed to investigate whether sensory nerves or smooth muscle cells are included in the mechanisms, through the study of tissue specific genetically modified mice.

This is a highly readable and concise manuscript with a relatively simple and clear take home message that advances current knowledge. However, at times the information could be more fully given.

Reviewer #3 (Public Review):

This work seeks to identify a common factor governing priority effects, including mechanism, condition, evolution, and functional consequences. It is suggested that environmental pH is the main factor that explains various aspects of priority effects across levels of biological organization. Building upon this well-studied nectar microbiome system, it is suggested that pH-mediated priority effects give rise to bacterial and yeast dominance as alternative community states. Furthermore, pH determines both the strengths and limits of priority effects through rapid evolution, with functional consequences for the host plant's reproduction. These data contribute to ongoing discussions of deterministic and stochastic drivers of community assembly processes.

Strengths:

Provides multiple lines of field and laboratory evidence to show that pH is the main factor shaping priority effects in the nectar microbiome. Field surveys characterize the distribution of microbial communities with flowers frequently dominated by either bacteria or yeast, suggesting that inhibitory priority effects explain these patterns. Microcosm experiments showed that A. nectaris (bacteria) showed negative inhibitory priority effects against M. reukaffi (yeast). Furthermore, high densities of bacteria were correlated with lower pH potentially due to bacteria-induced reduction in nectar pH. Experimental evolution showed that yeast evolved in low-pH and bacteria-conditioned treatments were less affected by priority effects as compared to ancestral yeast populations. This potentially explains the variation of bacteria-dominated flowers observed in the field, as yeast rapidly evolves resistance to bacterial priority effects. Genome sequencing further reveals that phenotypic changes in low-pH and bacteria-conditioned nectar treatments corresponded to genomic variation. Lastly, a field experiment showed that low nectar pH reduced flower visitation by hummingbirds. pH not only affected microbial priority effects but also has functional consequences for host plants.

Weaknesses:

The conclusions of this paper are generally well-supported by the data, but some aspects of the experiments and analysis need to be clarified and expanded.

The authors imply that in their field surveys flowers were frequently dominated by bacteria or yeast, but rarely together. The authors argue that the distributional patterns of bacteria and yeast are therefore indicative of alternative states. In each of the 12 sites, 96 flowers were sampled for nectar microbes. However, it's unclear to what degree the spatial proximity of flowers within each of the sampled sites biased the observed distribution patterns. Furthermore, seasonal patterns may also influence microbial distribution patterns, especially in the case of co-dominated flowers. Temperature and moisture might influence the dominance patterns of bacteria and yeast.

The authors exposed yeast to nectar treatments varying in pH levels. Using experimental evolution approaches, the authors determined that yeast grown in low pH nectar treatments were more resistant to priority effects by bacteria. The metric used to determine the bacteria's priority effect strength on yeast does not seem to take into account factors that limit growth, such as the environmental carrying capacity. In addition, yeast evolves in normal (pH =6) and low pH (3) nectar treatments, but it's unclear how resistance differs across a range of pH levels (ranging from low to high pH) and affects the cost of yeast resistance to bacteria priority effects. The cost of resistance may influence yeast life-history traits.

• With proper design, the internet can play a more proactive role
• From passive to active, sensemaking to action
• Cosmolocal production: https://clreader.net
• Web 3 technology
• Indyweb

3 Be Radically Open-Minded

Bitcoin, in spite of its unintended consequences, does demonstrate the power and potential of these kinds of systems to scale.

Process flow: Worldview, purpose, metric and finally design

Paper 1: Worldview and purpose Paper 2: practical implementation Paper 3: Design

"Specifically, when one of my classmates stated how he was struggling with the concept and another one of my classmates took the initiative to clarify it, I realized that that individual possibilities vary greatly among students."

Example of using GPT-3 for programming

fighting and honor and protection

honor by resisting dishonor

honor

enforcement

honor

honor for all regardless of gender

how far honor goes

concept

how remained honorable

honor

.

.

white ppl are dumb

honor

Haseltine, W. A. (n.d.). Birth Of The Omicron Family: BA.1, BA.2, BA.3. Each As Different As Alpha Is From Delta. Forbes. Retrieved 30 March 2022, from https://www.forbes.com/sites/williamhaseltine/2022/01/26/birth-of-the-omicron-family-ba1-ba2-ba3-each-as-different-as-alpha-is-from-delta/

Can symbol that represents one thing change over a long period of time to mean something different?

Why was the apple chosen as the representation of temptation?

A Theory of signs and symbols that deals especially with there function in both artificially constructed and natural languages.

First

Arg3: Malgré les risques environnementaux qui pèsent sur les EM, il existe des initiatives pour protéger ces espaces

• Réduction des émissions de CO2 GAS + niveau CO2 atm + température ++ océans = phytoplanctons moins utiles à l'homme Absorber 30% du CO2 généré par l'homme Produire 50% oxygène = indispensables pour la vie humaine sur terre.

Arg3: Les Etats tentent également de lutter contre les trafics illégaux

• Lutte contre la pêche illicite Selon FAO = 15 et 20 % des prises => 23 Milliards $ /an Moins de préservation du stock renouvelable = surpêche Concurrence déloyale = pecheurs + respect quotas

• Lutte contre le trafic de cocaïne 2017 - 2019: Cocaïne saisie à bord d'embarcations commerciales x3 = 73 tonnes Moyens ? Sous marins artisanaux, Ou ? Antilles = plaque tournante Quelles saisies ? 3 tonnes sous marins par police espagnole en 2019

• Lutte contre le trafic des déchets Cout traitement + législation contraignante = Etats exportent leurs déchets / filières illégales ==> Pays d'Asie et d'Afrique: ++ déchets électroniques Malaisie => FR: 43 conteneurs de plastique illégaux

Arg3: Les EM sont au coeur de tensions géopolitiques entre les Etats qui se disputent l'accès aux ressources halieutiques, hauturières et aux routes maritimes

• Mer de Chine méridionale Chine // Philippines, Vietnam, Brunei, Indonésie, Malaison "langue de boeuf" => Archipel des Spratleys + Îles Paracels Zone de trafic CMM Territorialisation , militarisation des EM Mars 2020: percussion bateau de pêche vietnamien

• Mer de Chine Orientale Chine // Japon Îles Senkaku et Diaoyu COVID19: Liaoning traverse ZEE jap

• Mer méditerranée Turquie // Grèce // Chypre // Israël // Liban EM triangulaire de 850km² = réserves de gaz ?

Arg3: les ressources énergétiques sont également exploitées dans les Mers et les Océans

• les hydrocarbures 30% hydrocarbures proviennent de gisements offshore Mer du Nord, Mer Caspienne, Golfe de Guinée, Golfe Arabo-persique, Mer de Chine méridionale

espaces inexploités: conditions extrêmes (Arctique), fonds marins profonds = ++ pression (Brésil qui se lance dans l'exploitation d'hydrocarbures au dela du plateau continental)

• les énergies renouvelables off shore Usines marémotrices: UM de la Rance (Côtes d'Armor, FR) Parcs éoliens off shore: projets aux îles de Lérons, Europe = 1er prod mondial électricité = 5000 éoliennes off shore (Mer du Nord ++)

• les avancées scientifiques possibles Bathymétrie est mal connue = couts ++ 90% des espèces marines resteraient à découvrir

Arg3: les enjeux vitaux des chokes points pour l'économie mondialisée et le CM Connecter espaces de prod°/conso° Espaces maritimes très réduits concentrent trafic maritime:

• Canaux; Suez, Panama
• Détroit, Ormuz, Gibraltar, Bab el Manbed, Bering, Malacca
• Caps: Bonne espérance, Horn

Détroit de Malacca selon Institut Supérieur d'économie marine (2017) 14M barils / jours Port Klang (Malaisie) = 12e port à conteneurs mondial "Dilemme de Malacca" selon Hu Jintao 20 - 25% du trafic mondial / an

Dépendance = ouverture permanente des passages stratégiques Mauvaise situations: insécurité, piraterie, conflits, tensions géopolitiques sinon = perturber approvisionnement marchandises + matières premières = - économie mondiale EX: 1967 -> 1974 = pas Canal de Suez (G6jours) alternative = Cap de Bonne Espérance (+ temps, +argent)

DOI: 10.1016/j.celrep.2021.110234

Resource: (ZFIN Cat# ZDB-GENO-110330-3,RRID:ZFIN_ZDB-GENO-110330-3)

Curator: @scibot

SciCrunch record: RRID:ZFIN_ZDB-GENO-110330-3

What is this?

DOI: 10.7554/eLife.72345

Resource: (ZFIN Cat# ZDB-GENO-071217-3,RRID:ZFIN_ZDB-GENO-071217-3)

Curator: @scibot

SciCrunch record: RRID:ZFIN_ZDB-GENO-071217-3

What is this?

it should be regarding the first amendment not second!

DOI: 10.7554/eLife.69264

Resource: (ZFIN Cat# ZDB-ALT-130130-3,RRID:ZFIN_ZDB-ALT-130130-3)

Curator: @bandrow

SciCrunch record: RRID:ZFIN_ZDB-ALT-130130-3

What is this?

The president

incorrect- the act being charged is "Unfurled the glad, doused it with kerosene and set it on fire"

También depende del factor de cuanto uso se le ha dado a ese motor, no solo por el incremento de desgaste significa que va a bajar su calidad.

This seems like an unreasonably high stoichiometry of Arp2/3 complexes per actin subunit; we now know that each Arp2/3 complex covers a few subunits, so there shouldn't be enough room on the filament to fit 1:1 Arp2/3 complex/actin

It should be the first amendment

Wrong, it supposed to be did the voucher program violate the establishment clause?

Cleveland

incorrect school district - school district should be Cleveland

It should be Cleveland

APA 7 3 or more authors

THIS is it - web 3 is making consumers mutiplicitous - opens marketts WITHIN games, subworlds that can be exploited / marketed to / fashion trends will sweep games, online subcultures (maybe) - people have markeable personas on and off the web, new context for targeted advertising / commerce.

Will cannabalize physical economies?

Accessorize for a zoom meeting - digital suits, etc digital costumes. Something to wear at digital concerts, in games; your Perona will not be birthed into the metaverse clothed, accessorized...

Assets will be portable across platforms.

Is this the foundational argument for the Supremacy Clause? For this example, does this mean if the states had the power to influence federal programs or policies, that the powers delegated to the federal government would be redundantly delegated?

When do state laws take effect over federal laws? How do you know when which is supreme? or vice versa?

Based on the relationship between State, banks, and General Government, is this suggesting a contradiction or non mutual relationship between the 3 in this line of argument?

This whole phrase is really confusing me? I'm not able to even figure out what any of the parts mean, could anybody help me out?

Is this suggesting that if States were allowed to tax the Federal Government, would States hold power and authority over citizens outside of their state? Would State laws apply universally?

A lot of this argument seems centered around the idea that the people, via its representatives, declared the Constitution has supreme power over states. In this, a State (and by extension, representatives of the people) is arguing the apparent supremacy of the federal gov't over the state, doesn't this contradict the argument of the Supreme Court a bit, that the will of the people was for a federal gov't to hold supreme over state?

Does Maryland grapple with the idea that the sovereignty and power of the states comes from the people in its argument that the Constitution receives its power from the states, as opposed to the people?

I don't understand what this is saying? So on the basis of Marylands contends it changes the meaning of what the Bank means in the constitution?? I'm not sure if I even read it correctly the end of the sentence isn't making sense to me. Changes the character of what instrument? Constitution?

Taxation seems to be a big pinpoint of this argument. In history we have seen many problems with "taxation without representation" or misuse of taxing in this case, but we also see problems today with people not agreeing with where the tax money goes, or especially problems with getting tax returns. Do you think taxation is going to continue being a problem?

This question is more a thought for questions. Do you think that this idea of one government have power over another government issues still stand in to days modern world? or do you think that states and governments the the US are more lacs about this issues then they where in 1819?

Is 'another government' directly referring to the state vs. the national government?

What constitutes a case of confidence? Is Marshall saying here that the national and state governments need to just have confidence in one another that there will be no abuse of power from either end? When does the Court decide a case is to be considered a case of confidence?

Kind of seperate, but do federal buildings pay taxes to the state they are in? Or to the government? Or do they pay at all? If they dont does that mean that the state tax payer does?

In the Epstein text, it says that one of the seven Supreme Court Justices, Thomas Todd, did not participate in the decision. So it was unanimous, but only among 6 of the 7. I wonder why Todd didn't participate? Does anyone know from the text or other history?

I feel like this is a tad dramatic. How would allowing Maryland to tax a government institution arrest "all the measures of the Government"? I understand that taxing the bank would likely lead to the closing of that bank - but how would it interrupt the rest of our governence?

There - opens up GIGANTIC barter economy possibilities - will shut out old middle men & create new ones - swap airline tickets / hotel reservations for concert tickets or memorabilia

incorrect: The Court held that the President's military power as Commander in Chief of the Armed Forces did not extend to labor disputes.

The president.

News ·, C. B. C. (2021, October 1). B.C. expands mask mandate in schools to include kindergarten to Grade 3 after community outcry | CBC News. CBC. https://www.cbc.ca/news/canada/british-columbia/bc-schools-masks-safety-plans-update-1.6196198

DOI: 10.1016/j.celrep.2021.109775

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Curator: @Naa003

SciCrunch record: RRID:ZFIN_ZDB-ALT-070612-3

What is this?

We do not need images here. you can use some kind of icon if you wish. But this is largely text. Also FYI this section might need a headline. Such as summary overview - tbd.

Now that Marshall observes the supreme law of the land to be the constitution, this makes me wonder how the Judiciary Act of 1789 was passed when it altered the original jurisdiction that was written in the constitution. Did the creators of the this act not consult or care about the constitution?

This concludes Marshall's habit of asking questions that he proceeds to answer. Are many modern day decisions written similarly? Or is this style more suited to an early justice seeking to define the role of the court, including the types of questions a Justice should be asking and answering?

Okay help me clarify this. In this phrasing saying that if Congress gives appellate jurisdiction over the constitution witch already holds original jurisdiction than that new law or rule makes no sense?

So a mandamus can only be applied to Appellate jurisdiction and not Original? Or can it be applied to both if met with the "specificity" of the original jurisdiction requirements?

I realize this is just an example he's using to prove his point, that every word of the constitution is important and that the constitution should trump other laws. However, I've never heard of either of these - A "bill of attainder" or an "ex post facto" law. Does anyone know what these are?

I'm a little confused on how this analogy fits in. Is this meaning that the bill passed should be enforced by the courts? If this is true how exactly does this fit in the argument?

I do not understand how this statement relates to what was said before. If I'm correct, the previous statements was suggesting that the supreme and inferior courts have certain jurisdiction. Are they saying that how jurisdiction is determined may change over time?

I thought the whole point of this case was to review laws or precedents within the constitution and deem whether or not they were truly viable. Doesn't appellate jurisdiction become necessary then? A higher court overturning a lower courts decision?

How can a court's opinion change? When there are different people on the court would that maybe produce a different outcome? How would you be able to be sure that things are standard?

I am confused on how the legislature fits into the court's original jurisdiction. Did the legislature have to approve each of the cases that the supreme court took? Why only for original jurisdiction and not appellate jurisdiction as well? Does this still apply today?

Where does the issue writs of mandamus come from then if not the constitution? I thought that the way judicial courts act were all centered around the constitutional law. But the way this is worded, it appears that mandamus is not in reference to the constitution.

I'm curious as to how the writers of the Constitution had not considered that something similar could occur? Why did the writers not introduce some sort of specific method where one of the branches could declare an action of another unconstitutional?

DOI: 10.1111/bph.15630

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What is this?

DOI: 10.1016/j.devcel.2021.09.005

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Curator: @Naa003

SciCrunch record: RRID:ZFIN_ZDB-ALT-140521-3

What is this?

I looked up the Voluntary Cessation Doctrine, but I am still unsure what it means and how it pertains to this case? I wish they would have elaborated more on it. I could be mistaken, but I believe the Doctrine deals with exceptions to mootness, however, I thought Justice Breyer said this case was not moot.

Does Lockey vs Davey involve the qustion of scholarship (of religious schools) provided from government money? Thats what I'm gathering but I'm not sure. Not familiar with the case but before I look it up I'm guessing it has to do with government funded school scholarships secular vs non secular?

How often does social media play a part into political bias? How are judges or trial members able to keep their rulings separate from the bias they're hearing in the news or headlines?

He doesn't really answer the justices question of how he doesn't see the other way of questioning as discrimination IN FAVOR of the church against other non religious people which I think is sort of telling and again why I think justice sotomayor is one of the dissenting judges. One question I have is whether or not there actually is anything in the constitution that protects discrimination in favor of religion? I always hear about it the other way around and I remember in one instance not long ago about a christian baker who refused to bake a wedding cake for a gay couple based on the argument that it violates his ability to practice his religious beliefs. The court sided with him, which to me is discrimination in favor of "religious beliefs" that was ruled by the supreme courts as justified and constitutional.

Having no prior knowledge of the Establishment Clause, I believe I've been able to glean a little of what it might say from the course of listening to this case. The application of it seems to be broken into two halves of conditionality, "endorsement" and "entanglement." Does anyone on the thread have a definition of what these two conditions mean?

This mention of Locke has been used numerous times throughout this conversation, and I have yet to understand where the meaning of this is being drawn from. Are they referring to something John Locke wrote? Is this the name of something or someone I may have missed?

DOI: 10.1016/j.cub.2021.08.049

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What is this?

DOI: 10.1016/j.cub.2021.08.049

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What is this?

DOI: 10.1016/j.cub.2021.08.049

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What is this?

polyphonic: style of musical composition employing two or more simultaneous but relatively independent melodic lines

merriam

primordial: existing in or persisting from the beginning (as of a solar system or universe)

merriam

dampness of homes in council estates in Bath. research for community advocacy. Collective action example.

he is transitioning from what he is going through to what he went through through the class. teacher seems pretty mean towards the students and a little bit aggressive

he thought he was doing well until he mispronounced ibm and learns that it was a mistake he shouldn't of made because of how the teacher was ridiculing every single student he was confused as to why the teacher was referring to objects as genders it just didn't make sense to him

feeling very scared. seems like he is regretting it a little bit?

Moderna Completes Submission of Biologics License Application to the U.S. Food and Drug Administration for its COVID-19 Vaccine | Moderna, Inc. (n.d.). Retrieved 26 August 2021, from https://investors.modernatx.com/news-releases/news-release-details/moderna-completes-submission-biologics-license-application-us/

DOI: 10.7554/eLife.44431

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What is this?

DOI: 10.7554/eLife.38911

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What is this?

DOI: 10.1016/j.neuron.2018.06.035

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What is this?

DOI: 10.7554/eLife.68755

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What is this?

DOI: 10.1016/j.celrep.2019.09.041

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What is this?

DOI: 10.7554/eLife.35796

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What is this?

DOI: 10.1016/j.mod.2015.10.001

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What is this?

DOI: 10.1016/j.cub.2017.11.018

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What is this?

This list makes sense based on the definition of metadata above in the article saying that it helps organize, find and understand data. I would expect these elements to be a part of metadata because they all give information as to what you are looking at and who created it.

The word metadata sounded way more advanced than my skill level in computers. I didn't really know what the word metadata meant until reading this article. The fact that it is just data about data makes it way easier to understand. I am finding that a lot of terms that we have used so far in class seemed hard to understand but are actually simple to do once they're broken down.

I agree with this. I think we should be asking and questioning things because that is how we learn and develop our ideas and opinions. Once we start questioning all of these things we can take this new knowledge and start to make changes.

I don't believe that Google should be biasing search to its own economic interests. I find that when I am searching things that my ads are targeted to what I have looked at previously or something that Google thinks I will like. As well, some of the other ads are completely random and not related to anything I have searched. I think that Google should base its ads on equality as well as its searches so you gain accurate information and not something put up to serve their own economic interests.

I can't believe that people are still thinking this way. Suggestions such as women cannot drive or be trusted and they should stay at home and be put in their places are not ones that we should be hearing anymore. Men and women are supposed to be viewed as equal and it shocked me that these came up as autosuggestions on Google Search. That shows that there is still a ways to go to fully achieve gender equality.

It would be great if we could pull empirical evidence to support this

Testing out the annotate feature. Student 1 will highlight sections according to the prompts, as shown HERE.

For example: "This is me during interviews. I say too much and veer off topic."

This is a shortened version of the full definition to avoid vocab words we haven't defined yet

Starting off with Giacomo's slide content

Johnson, Khari. ‘AI Could Soon Write Code Based on Ordinary Language’. Wired. Accessed 21 June 2021. https://www.wired.com/story/ai-write-code-ordinary-language.

DOI: 10.1016/j.celrep.2021.109255

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What is this?

DOI: 10.1016/j.celrep.2021.109255

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What is this?

DOI: 10.1016/j.celrep.2021.109255

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What is this?

DOI: 10.1016/j.celrep.2021.109255

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What is this?

DOI: 10.7554/eLife.62196

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What is this?

DOI: 10.1016/j.celrep.2021.109230

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What is this?

Reviewer #3 (Public Review):

Barone, Paul et al. present a new computational method, named T-REX, to detect changes in immune cell populations from repeated cytometry measurements (before and after infection or treatment). The proposed method is designed to detect changes in rare and common cells with particular focus on the former. T-REX detects subpopulations of cells showing marked differences in abundance between the proportion of cells from different time points (before and after infection) from a single individual. The method relies of a dimensionality reduction step using UMAP followed by a K-nearest neighbor (KNN) search to identify cells that have a large fraction (>0.95) of neighbors from one time point, indicating expansion or shrinkage of certain cell populations. Areas in the UMAP with clustered expanding or shrinking neighborhoods are labeled as hotspots. Cells in these hotspots were further characterized and enriched markers were identified using MEM, a method published earlier by the same authors. T-REX was applied to a newly collected dataset of rhinovirus infection and three publicly available datasets of SARS-CoV-2 infections, melanoma immunotherapy and AML chemotherapy. The results are presented clearly and the authors discuss in details several examples in which the cells identified by T-REX have a phenotypic profile which align with previous knowledge, indicating the relevance of the results.

Strengths:

• T-REX is based on a simple pipeline including UMAP and KNN. This is an advantage especially given the large number of cells collected. Further, the proposed approach has a key advantage since it allows the analysis of one sample at a time, which is practical if one wants to analyze a new sample. There is no need to rerun the analysis on an aggregate of a large number of samples.

• The new rhinovirus dataset is of great value to the community.

Weaknesses:

• The paper lacks a comparison to other methods for differential abundance testing. In particular, it is not clear how T-REX differs from the Differential abundance test proposed by Lun et al. (https://doi.org/10.1038/nmeth.4295). Similarly, there are no experiments or results to support the authors' initial claim that T-REX outperforms current clustering-based methods (SPADE, FLOWSOM, Phenograph,...etc.) in capturing changes in rare (<1%) cell populations.

• T-REX relies on arbitrary cutoffs (0.95 and 0.5 %) to define expansion or shrinkage in the neighborhood of each cell (0.95 and 0.5 %) rather than a formal statistical test. These cut-offs were defined based on the ability to detect tetramer positive cells in one subject only. This greatly limits the generalizability of the method.

• The authors do not motivate the use of UMAP prior to the KNN graph reconstruction. While UMAP is a clearly powerful method to visualize single cell data, the resulting embedding can potentially show distinct groups of points when the high dimensional manifold is more continuous. For this reason, KNN graphs are usually built using the high-dimensional data (or principal components).

• Given that T-REX is mainly developed to detect changes in rare cell populations, the paper lacks an assessment of the method's sensitivity. For instance, cells were subsampled equally from each time point. An assessment of the effects of this subsampling step is necessary. In general, a guide to the users indicating the limitations of T-REX will be greatly helpful.

• Given that the main aim of T-REX is to detect differences in rare cells, the rational to perform a separate analysis for CD4 positive cells is not clear. One would expect these differences to be identified also in the analysis performed using all cells.

• The paper lacks a discussion on the effects of batch effects between the different time points on the performance of T-REX.

Reviewer #3 (Public Review):

This is an important manuscript on COVID-19 convalescent plasma (CCP) that challenges the findings of the larger Mayo Clinic CCP study demonstrating a lack of efficacy. Their main findings are that there is a strong inverse correlation between CCP use and mortality for admitted patients in the USA. Overall this is a well written manuscript without any overt weaknesses.

Shapoorji Pallonji Joyville Sector 102 Gurgaon is a premium residential project in close proximity to Delhi. Contemporary construction, state-of-the-art amenities, top-notch security, and huge green expanse make the project highly demanding. Nestled right close to major establishments like hospitals, schools, malls, and offices.

Reviewer #3 (Public Review):

In this study, Alhussein and Smith provide two strong tests of competing hypotheses about motor planning under uncertainty: Averaging of multiple alternative plans (MA) versus optimization of motor performance (PO). In this first study, they used a force field adaptation paradigm to test this question, asking if observed intermediate movements between competing reach goals reflected the average of adapted plans to each goal, or a deliberate plan toward the middle direction. In the second experiment, they tested an obstacle avoidance task, asking if obstacle avoidance behaviors were averaged with respect to movements to non-obstructed targets, or modulated to afford optimal intermediate movements based on a commuted "safety margin." In both experiments the authors observed data consistent with the PO hypothesis, and contradictory of the MA hypothesis. The authors thus conclude that MA is not a feasible hypothesis concerning motor planning under uncertainty; rather, people appear to generate a single plan that is optimized for the task at hand.

I am of two minds about this (very nice) study. On the one hand, I think it is probably the most elegant examination of the MA idea to date, and presents perhaps the strongest behavioral evidence (within a single study) against it. The methods are sound, the analysis is rigorous, and it is clearly written/presented. Moreover, it seems to stress-test the PO idea more than previous work. On the other hand, it is hard for me to see a high degree of novelty here, given recent studies on the same topic (e.g. Haith et al., 2015; Wong & Haith, 2017; Dekleva et al., 2018). That is, I think these would be more novel findings if the motor-averaging concept had not been very recently "wounded" multiple times.

The authors dutifully cite these papers, and offer the following reasons that one of those particular studies fell short (I acknowledge that there may be other reasons that are not as explicitly stated): On line 628, it is argued that Wong & Haith (2017) allowed for across-condition (i.e., timing/spacing constraints) strategic adjustments, such as guessing the cued target location at the start of the trial. It is then stated that, "While this would indeed improve performance and could therefore be considered a type of performance-optimization, such strategic decision making does not provide information about the implicit neural processing involved in programming the motor output for the intermediate movements that are normally planned under uncertain conditions." I'm not quite sure the current paper does this either? For example, in Exp 1, if people deliberately strategize to simply plan towards the middle on 2-target trials and feedback-correct after the cue is revealed (there is no clear evidence against them doing this), what do the results necessarily say about "implicit neural processing?" If I deliberately plan to the intermediate direction, is it surprising that my responses would inherit the implicit FF adaption responses from the associated intermediate learning trials, especially in light of evidence for movement- and/or plan-based representations in motor adaptation (Castro et al., 2011; Hirashima & Nozacki, 2012; Day et al., 2016; Sheahan et a., 2016)?

In that same vein, the Gallivan et al 2017 study is cited as evidence that intermediate movements are by nature implicit. First, it seems that this consideration would be necessarily task/design-dependent. Second, that original assumption rests on the idea that a 30˚ gradual visuomotor rotation would never reach explicit awareness or alter deliberate planning, an assumption which I'm not convinced is solid.

The Haith et al., 2015 study does not receive the same attention as the 2017 study, though I imagine the critique would be similar. However, that study uses unpredictable target jumps and short preparation times which, in theory, should limit explicit planning while also getting at uncertainty. I think the authors could describe further reasons that that paper does not convince them about a PO mechanism.

If the participants in Exp 2 were asked both "did you switch which side of the obstacle you went around" and "why did you do that [if yes to question 1]", what do the authors suppose they would say? It's possible that they would typically be aware of their decision to alter their plan (i.e., swoop around the other way) to optimize success. This is of course an empirical question. If true, it wouldn't hurt the authors' analysis in any way. However, I think it might de-tooth the complaint that e.g. the Wong & Haith study is too "explicit."

Reviewer #3 (Public Review):

This is a well-presented study on the development of the CNS in the octopus O. vulgaris. The aim of the study is to identify the origin of the neural progenitors of the brain. The authors provide an excellent gene expression study of conserved neural genes to identify the location of these progenitors. Furthermore, by cell lineage tracing, they confirm the results of a previous study by Koenig et al. showing that the progeny of neural progenitors generated in the so-called lateral lips, a region adjacent to the eyes, migrate to different brain areas. The neural precursor location in the brain can be correlated with their spatial origin from the neural progenitors in the lateral lips. The authors suggest that the spatial map of the lateral lips is conserved in cephalopods. Furthermore, they analyse the mitotic activity in the developing brain by Ov-pcna in situ hybridisation and anti-PH3 immunohistochemistry. The authors conclude that "grossly, the embryonic octopus brain does not contain dividing progenitor cells." Based on the cell lineage studies, the strong expression of neural genes in the lateral lip and the observed mitotic activity, the authors overall conclude that the lateral lips represent the neurogenic zone in the developing brain of the octopus, i.e. that the neural progenitors of the brain derive from this area. I agree with the authors that the lateral lips are neurogenic regions, however, it is also possible that neural progenitors do arise from other regions of the developing brain. Overall this is a valuable contribution to our knowledge of neurogenesis in deuterostomian invertebrates and in a wider context the evolution of neural developmental processes.

Reviewer #3 (Public Review):

The manuscript of Oggenfuss et al presents a comprehensive analysis of TE insertion polymorphisms detected in the genome of ~300 isolates of the wheat fungus Zymoseptoria tritici. The article shows that numerous TE families generated thousands of polymorphic insertions and the authors propose that some of these insertions might potentially be linked to adaptation. They identified a recent burst of transposition in a rapidly expanding population, providing empirical evidence that drastic demographic process shape TE dynamics in nature. Last, they show that intra-specific variation in genome size can be accounted by variation in the number of polymorphic TE insertions, which recapitulate the well stablished association between TE content and genome size variation observed across the diversity of life forms.

The article is well written, present novel as well as relevant results, and provide insights to our understanding of the role of TEs in microevolutionary processes. In addition, it provides an important amount of population genomic data that will serve as a resource. Thus, this manuscript is of potential interest to a broad audience on evolutionary and population genomics.

My major concern is the lack of strong evidence supporting positive selection and/or functional relevance of the TE insertions detected. In particular, the selective sweep scans performed ignored other types of variants (such as SNPs and INDELs), preventing the identification of the actual targets of natural selection.

Reviewer #3 (Public Review):

In "Assembly of higher-order SMN oligomers is essential for animal viability, requiring a motif exposed in TG zipper dimers," Gupta et al. present an impressive amount of data regarding the solution behavior of constructs of the protein SMN1 (or just SMN) from Homo sapiens, Drosophila melanogaster, and Schizosaccharomyces pombe. Defects in the Hs protein are known to cause the neuromuscular disease "Spinal Muscular Atrophy" (SMA). They also present experiments in genetically modified organisms (fission yeast and fruit flies) to test their hypotheses. Bioinformatics are used to generate and refine hypotheses. The potential power of these complementary methods is substantial, if employed well.

The main finding of these researchers is that the oligomerization potential of SMN and its disease-causing variants (usually in complex with the protein Gemin 2 or "G2") mostly correlates with phenotype severity. In humans, this is correlated with the Type of SMA (I/0 for severe disease, ranging to IV for a milder form), and in fruit flies and yeast, it is correlated with viability and, in some cases, animal behavior. The results are extended through the creation of a model that purports to show how higher-order SMN oligomers can form.

Strengths:

The experiments appear to have been carried out competently. There is a virtual mountain of data presented in this paper, and, for the most part, they are summarized in a digestible fashion. The effort to correlate the biophysical solution data with observable phenotypes in human patients or genetically modified organisms is laudable, and it is done in a thoughtful fashion. The authors' structural intuition and savvy enables the generation of testable models that are explored in the paper. A plausible model for higher-order oligomers is presented.

Weaknesses:

The most serious weakness of the paper is that the data cannot support the conclusion stated in the title, i.e. that multimerization of SMN is necessary for organismic viability. Instead, the data support an already-stated, decades-old conclusion (see their reference 21): that multimerization correlates with disease (viability). Even if the reader takes into account the new information about a multimerization interface that is separate from the dimerization one, the advance seems incremental.

The large amount of data leads to numerous difficulties for the reader in the text:

1) Complex biophysical measurements, due to space, are usually summarized by one or two words in tabular format.

2) When these measurements are shown, there is no visual context for the reader to assess the pre-digested conclusions that are included in the figures. For example, all SEC-MALS data show a conclusion ("Tetramer-Octamer"), but there is no visual cue for the reader to know what the theoretical masses for these species are (so that the reader may draw an independent conclusion).

In some cases, the conclusions reached in the paper are not clearly supported by the data or are self-contradictory. An example is the discussion of the residue H273 (human numbering). In Fig. 4B, the mutation H273R is said to have a wild-type "Oligomer Status". But in Fig. 5B, it is "Dimer-Tetramer+". The text says that H273R is "only partially impaired" in forming oligomers; the authors apparently mean the data presented in Fig. 5B but refer to the contradictory result in Fig. 4B. Another example centers on the discussion of the putative "dominant-negative" effect of some human missense mutations. But they do not point to any human data that support this contention (SMA-associated missense mutations are usually discovered in mixed heterozygotes have a deletion in the other copy of the Smn gene), but they cite data that suggest a more nuanced position regarding negative dominance would be appropriate.

Finally, the paper suffers throughout from a lack of precision of language that undercuts its conclusions at numerous points. They continually rely on qualitative statements rather than hard, statistically rigorous facts, e.g. "more intimate," "a bit of a sequence outlier," "very modest."

Reviewer #3 (Public Review):

This study investigates the temporal orientation abilities of cerebellar degeneration and control subjects during an orientation discrimination task of visual stimuli with showed a contrast near threshold. Participants were queried to express their discrimination decision with a response only after a random delay following target offset, which decreases the motor preparation component of the task in the interval-based condition. CD subjects showed similar visual discrimination performance to controls when cued by a rhythmic set of stimuli but showed no benefit when the target interval was presented aperiodically. The authors interpret these findings as evidence supporting the notion that the cerebellum plays a role in interval based attentional orienting to proactively modulate perception. This is an elegantly simple experiment providing a novel observation in the field.

Reviewer #3 (Public Review):

The authors use a synthetic light-controlled transcription factor (GAVPO) to test a model of bistable gene expression that is hypothesized to originate from positive feedback via local histone modifications by trans-activator recruitment of CBP/p300 to facilitate open chromatin, which facilitates GAVPO binding, etc... Their proposed model for the origin of bistability is important because it should apply to any trans-activator that recruits CBP/p300 to modify chromatin and active gene expression. The authors show that periodic modulation of light reduces the bimodal distribution at intermediate light-intensity levels to a unimodal distribution. This is an elegant demonstration of how GAVPO and different temporal patterns of light can reduce cell-to-cell variability in gene expression, if needed.

Strengths:

The authors generate an impressive amount of single-cell data of gene expression and chromatin state (flow cytometry, single-cell sequencing, live-cell MS2-tagging) at different intensity levels. The periodic modulation of GAVPO activity by light is a practical demonstration of how to sculpt the gene expression output in useful ways. This may be a very useful tool for future biologists.

Weakness:

The proposed model for bistability is not convincingly tested or supported by the existing data. Each reporter should exhibit a bistable response because the positive feedback is localized to the promoter via cis-effects on gene expression by local chromatin state/GAVPO binding. The authors show a bimodal distribution of gene expression in a population of cells, which is consistent with a bistable response in a single reporter gene. However, their strain has 9 independent reporters integrated into the genome. Thus, I would expect to see up to 10 peaks, not 2 peaks. Moreover, the mathematical model used to validate their observations does not model the total expression from 9 independent promoters, which is a critical omission given the cis-nature of the positive feedback loop. The fact that these 9 promoters generate 2 peaks at intermediate light intensity suggests that the GAVPO bistability likely originates from a trans-effect, i.e., either all 9 promoters are OFF or all 9 promoters are ON, not a cis-effect.

Reviewer #3 (Public Review):

In this report the authors characterize a mechanism that plays a role in inducing the rhythmic depolarizations that are observed in identified neurons that are part of the feeding CPG in Aplysia. The neurons studied (B63 neurons) are of interest because previous work has established that they play an important role in triggering cycles of motor activity. Further, previous work from this group has demonstrated that activity in the B63 neurons can be modified by operant conditioning.

The authors present this study as though previous work had established that plateau potentials generated in the B63 neurons play an important role in driving network activity. For example, in line 102 they state "This essential role played by B63 is partly mediated by a bistable membrane property, which allows the sudden switching of the neuron's resting membrane potential to a depolarized plateau..." To support this statement, they reference Susswein et al. 2002, which does not support this statement. In the Susswein et al. study it is the B31/32 neurons that are modeled as having plateau properties.

If previous work has not established the role of the B63 plateau potentials, the only data that speak to this issue are presumably in the current report. In this study the authors do provide data that indicate that the B63 neurons generate low amplitude oscillations that are not likely to depend on input from the electrically coupled neurons studied (notably B31). The authors also show that in some instances, these depolarizations do trigger plateau potentials in B63. It is, however, not clear that the B63 generated plateau potentials are then responsible for triggering network activity (e.g., as opposed to a situation where depolarizing input from B63 triggers plateau potentials in B31/32 and the depolarization in B31/32 drives the rest of the feeding circuit). For example, in Figs. 6A and Supplemental Fig. 4A it does not appear that the plateau depolarization in B63 is being transmitted to other electrically coupled neurons to any large extent.

A clarification of this issue is important because it potentially impacts thinking concerning how 'decision making' is occurring. If decision making means induction of a motor program and this does not occur unless the depolarization in B63 is transmitted to B31/32, the process is more complicated than what the manuscript currently suggests.

The title is misleading since there are no studies of behavior in this report.

In part, interest in the mechanisms that drive spontaneous oscillatory activity in the B63 neurons stems from the overall context of this work. Namely the authors have previously established that oscillatory activity can be modified through associative learning. In the Sieling et al. 2014 study they demonstrate that two aspects of plasticity are accounted for by changes in synaptic properties and an effect on a leak current. For readers trying to understand this body of work as a whole, the Discussion should more clearly indicated how the results of the present study integrate with these previous findings.

Reviewer #3 (Public Review):

Some Gram-negative bacteria synthesize acyl-homoserine lactone molecules, which are secreted into the environment and then transported into nearby bacteria, where they are detected by receptors. Different species make acyl-homoserine lactones that differ in chain length and oxidation state at the C-3 position. The manuscript by Wellington et al. reports an elegant and compelling investigation of the specificity determinants involved in quorum sensing, using a combination of bioinformatics and experimental approaches.

Over the course of evolution, if an amino acid change occurs in one protein, then a compensating change can occur in a partner protein to restore/retain a functional interaction between the two. Analyses of evolutionarily covarying positions between two interacting proteins, or within a single protein, have long been used to identify positions that directly interact. Wellington et al. applied the same approach to two protein families (the synthases and receptors for acyl-homoserine lactones) to identify positions that are connected not by direct physical interaction between the two proteins but rather by interaction with the same acyl-homoserine lactone. The covariation analysis was made possible by the fortuitous case (and reasonable assumption) that genes encoding partner synthases and receptors are located close to one another within bacterial genomes.

The covarying residues turn out to be in the active site of the synthase and the binding site of the receptor, in positions that directly interact with the acyl-homoserine lactone. The authors made a variety of single amino acid substitutions at positions with high covariation scores in the Pseudomonas aeruginosa LasI synthase and LasR receptor proteins. The mutant proteins exhibited altered synthetic and detection specificities for acyl-homoserine lactones. Altering three residues simultaneously resulted in substantial changes in specificity.

This paper constitutes a proof of principle for an approach that could be used to investigate other families of proteins connected by interactions with small molecules (e.g. metabolic pathways). Furthermore, it suggests a path toward rational engineering of quorum sensing systems for synthetic biology, as well as specificity prediction for uncharacterized quorum sensing pathways based simply on the primary amino acid sequences of the synthase and receptor proteins.

Reviewer #3 (Public Review):

The manuscript titled "The Shu complex prevents mutagenesis and cytotoxicity of single-strand specific alkylation lesions" investigates the biological function of the Shu complex in S. cerevisiae. The Shu complex, containing a DNA binding module comprised of the Csm2-Psy3 heterodimer, is conserved from budding yeast to man, and contributes to the defense against DNA damage caused by DNA alkylation. DNA alkylation occurs due to spontaneous reactions with metabolites and can be greatly increased by exogenous exposure to DNA alkylating agents. Therefore, it is an important question for how the Shu complex acts to detect and direct repair of alkylation damage. It has been well established that loss of the Shu complex sensitizes cells to alkylation damage, but the mechanism by which this complex locates sites of DNA damage and directs repair is not fully understood. This paper measures the methylation-induced mutation spectrum and uses genetic interactions to argue that the Shu complex may be involved in detecting and directing error-free repair of 3-methyl cytosine. This is a plausible hypothesis based on the body of previous work, however the evidence that Csm2-Psy3 directly detects 3-methyl cytosine sites is indirect. It would be highly significant if this complex recognizes many different structures, but future structural information is needed to understand how this could be possible.

The strengths of the paper are in the use of whole genome sequencing to map mutation type and location in different genetic backgrounds and in the systematic testing for genetic interactions between csm2 and other DNA repair factors. It appears that the mutation spectra are very similar in the presence and absence of csm2, which suggests a broad role of the Shu complex in the cellular response to MMS.

The impact of the work is that it could help to explain the cellular program for protection against DNA alkylating agents in budding yeast which has been a very valuable model eukaryotic organism, and raise new questions about how DNA alkylation repair pathways might function in humans that differ from yeast in important features such as in the presence of a direct repair pathway performed by ALKBH2 and ALKBH3.

Reviewer #3 (Public Review):

The authors tackle an interesting question - whether the dentate gyrus is a locus of pathology in Scn1a+/- mice and uncover a strong phenotype - the granule cells of the dentate gyrus are over-activated and the EC to dentate pathway is prone to seizure genesis. In the discussion, they suggest that their results support the idea that the DG may be a common locus to several different types of epilepsy... an attractive hypothesis! There are several strengths of the paper. The team has done a nice job of presenting 'ground-truth' data that their measurements of dF/F across a large population of granule cells correlates with action potentials in these cells. As the authors point out, this is especially important when working in disease models in which the dF/F-action potential relationship may be altered. Throughout, the authors were also careful about considering the limitations of their various techniques and analyze the data in several ways to account for possible artifacts (e.g. ensuring that differences in activation are not arising because of slicing and consideration of kindling in later in vivo seizure threshold experiments). The experiments were well designed and appropriately interpreted.

One of most intriguing results of the work is that PV interneurons in the DG of Scn1a+/- show only very minor impairments in young adult animals (they show more spike accommodation than in control animals). Rather, it seems that the GCs receive enhanced excitation from the entorhinal cortex. They perform a set of pharmacological experiments to prove that PV interneurons (and more generally inhibition) do not account for the difference in granule cell activation - however, here it would be useful to see the data summarized more consistently. It is difficult to interpret the pharmacological results (both of which are presented as changes in dF/F0) with respect to the initial findings of the manuscript (presented as estimated activation across the entire population). A beautiful aspect of this work is that it goes from cells to circuits to intact brain (in vivo). They nicely show that the heightened excitation from the EC to the DG is sufficient to drive seizures in the Scn1a+/- mice, and finally that since PVs are intact, they can be harnessed to balance out the over activation of GC via optogenetic stimulation of PVs.

Reviewer #3 (Public Review):