By Richard Bartlett;Patricia Bartlett
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Extra resources for Ball Pythons (Reptile Keeper's Guides)
It is usually tested by a person’s ability to tell the difference between a plain grey square and a square divided up by stripes. The narrower the stripes that can be distinguished, the better the visual acuity. e. have no visual input until then) have the visual acuity of a newborn baby when their cataracts are removed l these babies then improve their visual acuity rapidly, so that by 1 year old they have the same visual acuity as a baby that has developed normally l they then fall behind in their development, so that by 5 years old their visual acuity is 3 times worse than normal, and they never do develop normal adult visual acuity This indicates that there is no one ‘critical window’ when visual acuity develops, but rather a range of ‘windows’ in which deprivation of normal visual input has different effects on development.
The generation of an action potential is triggered by depolarisation of the plasma membrane. This makes the cell less negative inside, up to or beyond a certain threshold level. Once the threshold is reached, an action potential is always generated. An exception to this is during the refractory period — a short period of time immediately after an action potential, during which it is much harder to generate another action potential. The refractory period is divided into two parts. At first, no action potential can be triggered at all — this is called the absolute refractory period.
This can increase yields and reduce the risk of harming beneficial insects. l Crop plants can be produced that are resistant to a particular herbicide, allowing the herbicide to be sprayed on the crop where it will kill weeds but not the crop plants. l Crop plants can be modified so that they produce higher quantities of a particular Examiner tip Remember that the correct term to use here is ‘resistant’ not ‘immune’. nutrient, for example Golden Rice, which produces b-carotene (a precursor of vitamin A) and therefore reduces the risk of children suffering from vitamin A deficiency.