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Scientists have known for many years that plants respond to light, growing toward sources of light and protecting themselves from light that is too harsh. In many of these cases, plants are responding to the level of blue light. Blue light has several advantages over other colors. It is among the most energetic of the visible colors, and thus can have a greater effect on chromophore molecules that absorb light. For plants that live in water, blue light also penetrates deeper than other colors. Plants, as well many other types of organisms, use sensor proteins to see the level of blue light and respond to it.Full Article
Calcium is used to control many cellular processes that require synchronized action. For instance, in muscle cells, large quantities of calcium are stored in special compartments, termed the sarcoplasmic reticulum, which is released in a flood to trigger contraction simultaneously throughout the cell. The ryanodine receptor is at the center of this process. It forms a gated channel through the membrane of these storage compartments, which opens and releases the calcium when triggered. Full Article | Archive | PSI Structural Biology Knowledgebase
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