To test this hypothesis we conducted a detailed study on the root architecture of these crops using SimRoot (Postma and Lynch, 2011a, b), a functional–structural plant model, and estimated competition for nitrate, potassium and phosphorus among roots of maize, bean and squash plants grown in monoculture or polyculture.

In this study we examine how the water transport and photosynthetic carbon assimilation rates of leaves are related to the spatial arrangement of veins in the leaf mesophyll.

in an effort to more firmly ascertain the influence of climate on leaf physiognomy within species, we report results from a large data set that includes two North American woody plants (A. rubrum and Q. kelloggii) whose native ranges span large MAT gradients and are not closely related to each other.

We report results from randomized, placebo-controlled, double-blind trials of antibiotic therapy inseropositive and seronegative patients who had chron-ic symptoms after treatment for Lyme disease.