منابع مشابه
Squeezing dendritic necks
Squeezing dendritic necks Sure enough, diffusion restriction was induced in individual dendrites by pairing two excitatory signals from pre-synaptic and postsynaptic sources. The clampdown at the dendrite neck may involve cross-linking of an actin mesh, or blockage by mitochondria or smooth endoplasmic reticulum. Either way, says Sabatini, “if a spine can hold onto [molecules such as] active ki...
متن کاملHow Bird Necks Get Naked
Some birds such as vultures, ostriches, and certain species of stork have naked necks. This unusual feature allows them to tolerate heat better in hot climates. And, for vultures, the absence of neck feathers helps them poke about the insides of carrion unimpeded. The fossil record provides no evidence that naked necks evolved in a common ancestor, leaving scientists to explore other avenues to...
متن کاملThe Bare Metaphysical Possibility of Bare Dispositions
Many philosophers hold that all dispositions must have independent causal bases. I challenge this view, hence defending the possibility of bare dispositions. In part 1, I explain more fully what I mean by "disposition," "causal basis," and "bare disposition." In part 2, I consider the claim that the concept of a disposition entails that dispositions are not bare. dispositions necessarily have d...
متن کاملWhy sauropods had long necks; and why giraffes have short necks
The necks of the sauropod dinosaurs reached 15 m in length: six times longer than that of the world record giraffe and five times longer than those of all other terrestrial animals. Several anatomical features enabled this extreme elongation, including: absolutely large body size and quadrupedal stance providing a stable platform for a long neck; a small, light head that did not orally process ...
متن کاملThe Articulation of Sauropod Necks: Methodology and Mythology
Sauropods are often imagined to have held their heads high atop necks that ascended in a sweeping curve that was formed either intrinsically because of the shape of their vertebrae, or behaviorally by lifting the head, or both. Their necks are also popularly depicted in life with poses suggesting avian flexibility. The grounds for such interpretations are examined in terms of vertebral osteolog...
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ژورنال
عنوان ژورنال: Journal of Heredity
سال: 1914
ISSN: 1465-7333,0022-1503
DOI: 10.1093/oxfordjournals.jhered.a107903