postÂ·synÂ·apÂ·tic memÂ·brane. That part of the plasma membrane of a neuron or muscle fiber with which an axon terminal forms a synaptic junction. postsynaptic membrane. the excitable membrane of the DENDRITE next to the AXON at a synapse, that receives the nerve impulse.
Turbidity is the measure of relative clarity of a liquid. It is an optical characteristic of water and is an expression of the amount of light that is scattered by material in the water when a light is shined through the water sample. The higher the intensity of scattered light, the higher the turbidity. Material that causes water to be turbid include clay, silt, finely divided inorganic and organic matter, algae, soluble colored organic compounds, and plankton and other microscopic organisms. Turbidity makes water cloudy or opaque.
Turbidity Effects on Fish and Aquatic Life. The significance of excessive turbidity in water on fish and other aquatic life begins by modifying the temperature structure of lakes. Bottom temperatures are generally lower in turbid lakes or ponds than in clear ones. In many lakes, lower temperatures means lower productivity. Turbidity also interferes with the penetration of light.