By Gordon Grice
No matter if at a zoo, on a camping out journey, or lower than our bedsheets, we're surrounded by way of animals. whereas so much are completely risk free, it's the really good exceptions that populate The booklet of lethal Animals. Award-winning author Gordon Grice takes readers on a journey of the animal kingdom—from grizzly bears to nice white sharks, immense cats to crocodiles. each web page overflows with striking evidence approximately Earth's nice predators and unforgettable tales in their encounters with people, all introduced in Grice's signature darkish comedian variety. Illustrated with awe-inspiring pictures of beasts and insects, this wondrous paintings will horrify, satisfaction, and amaze.
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Additional resources for The Book of Deadly Animals
Sample text
NGF does not work on all neurons, but since the discovery of NGF, a number of other related neurotrophin proteins, including a protein called brain-derived growth factor (BDNF) and two closely related proteins, neurotrophin 3 and neurotrophin 4/5, have been identified. These proteins differ in terms of the types of neurons they act upon and the effects they exert. However, they all act on Trk receptors that are present on the responsive cells and that are specific for a particular neurotrophin.
Amount devoted to the closed eye, but the columnar stripes reflecting input from the deprived eye are discontinuous. Compare this image with Figure 2-5A, which shows the ocular dominance columns in a normal monkey. How might one eye take over cortical territory from the other? One plausible suggestion is that the axon terminals of the geniculate axons coming from the open eye do not retract as much as they do ordinarily, whereas the axon fibers coming from the closed eye retract much more. The implication here is that lateral geniculate axons compete for cortical space and synaptic connections in the young animal.
From these experiments (and others) has come the realization that there are positive and negative recognition factors at work in this process. That is, some factors attract axons whereas others repel them. A number of these factors have been identified as small proteins, but almost certainly all of the factors are not yet identified. The assumption is that these cell adhesion or repulsion proteins interact with receptors on the cells and or axons and activate intracellular enzyme cascades similar to those described earlier between the R8 and R7 cells in the developing fruit fly’s eye.