Word: gradient
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...mutation caused younger cells to stop and not pass the older neurons. A gradient of increasingly older neurons toward the outside of the cortex resulted, which, according to Tsai, "effectively inverted the pecking order of the cortex...
...goes one step further: making an analogy between the events of the Cambrian explosion and the characteristics of a chaotic system. In so doing, you raise a disturbing question: Might not theoretical biologist Stuart Kauffman's idea of the intrinsic instability of the evolving system be greatest when the gradient of change is at its steepest? If so, is the closing paragraph of your report pointing out the precariousness of human existence in the face of the current technological ''big bang''? CHARLES F. (''CHICK'') KELLER Los Alamos National Laboratory Los Alamos, New Mexico Via E-mail...
...answer, according to a group of Harvard chemists, is a qualified "yes." In a collaborative effort, Mallinckrodt Professor of Chemistry George M. Whitesides '60 and Manoj K. Chaudhury of Dow Corning showed that water, pulled by a chemical gradient, can indeed travel upwards on a surface...
...novelist was a latent homosexual. He cites incriminating passages from The White Peacock and allusions in Lady Chatterley's Lover that Mellors did not limit himself to ordinary heterosexual acts with Lady C. The difficulty with such speculation is that the term latent covers a long and slippery gradient. One might just as casually assume latent homosexual content in the movie Coming Home, that contemporary switch on Lady Chatterley in which the guy in the wheelchair gets the girl...
...adenosine triphosphate), which conveyed energy through the cell to power the cell's varied chemical reactions. But they had not been able to explain satisfactorily how ATP was formed. Mitchell suggested the novel theory that the key to ATP synthesis is the creation of a kind of gradient -or difference in voltage-on opposite sides of the membranes of bacteria, as well as of such cellular bodies as mitochondria and chloroplasts. This gradient is coupled with a flow of protons (which Mitchell calls "proticity") that in turn provides the energy for the synthesis of ATP. In addition to explaining...