Variation in physical and chemical characteristics of common bean (Phaseolus vulgaris L.) grain along a domestication gradient.

The objective of this study was to compare six samples of Mexican wild common bean (Phaseolus vulgaris L.) against three landraces and three improved cultivars with respect to physical and chemical attributes, and the culinary quality potential of their grain. A completely randomized experimental design was used to characterize the twelve genotypes.

Conjugate regenerative dividers.

We discuss a novel design of a self-starting regenerative divider that permits division by 3, 4, 5, 6 ...