منابع مشابه
Straight mutants of Spirillum volutans can swim.
Nonhelical mutant cells of Spirillum volutans ATCC 19554 can swim as fast as the helical cells. Consequently, a helical cell shape is not required for motility of this species, and the function of the polar flagellar fascicles is not merely to cause rotation, and therefore translocation, of the corkscrew-shaped cell.
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We report the discovery of a extremely narrow, extremely linear, ionized filament. The filament is ∼ 2.5◦ long and has an Hα surface brightness of ∼0.5 rayleighs. It is at high galactic latitude, stretching from (l, b) = (140.8◦, 39.0◦) to (138.0◦, 37.7◦). The filament is approximately “Y” shaped. The vertical segment of the “Y” is ∼ 1.2◦ long and ∼ 20′′ wide, and the widest separation of the t...
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Neurons in visual cortex are selective for the orientation of a visual stimulus, while the receptive fields of their thalamic input are circular. Cortical orientation selectivity arises from the organization of both thalamic input and local cortical circuits. In this issue of Neuron, Schummers and colleagues provide evidence that the local circuit mechanisms contributing to orientation selectiv...
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The past decade has seen a tremendous increase in the number of men treated for hypogonadism with the expectation of symptomatic benefit. However, the long-term cardiovascular safety of testosterone replacement remains unknown because retrospective studies of testosterone replacement have been inconsistent, and definitive, prospective, randomized studies are lacking. The purpose of this review ...
متن کاملThe straight and narrow path: the evolution of straight-line dispersal at a cane toad invasion front.
At the edge of a biological invasion, evolutionary processes (spatial sorting, natural selection) often drive increases in dispersal. Although numerous traits influence an individual's displacement (e.g. speed, stamina), one of the most important is path straightness. A straight (i.e. highly correlated) path strongly enhances overall dispersal rate relative to time and energetic cost. Thus, we ...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2015
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.112227