LYCOS RETRIEVER 
Chlorophyll: Plants
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Chlorophyll is the green pigment of plants which initiates photosynthesis by absorbing energy from sunlight and transferring this energy to other molecules. Chlorophyll causes carbon dioxide and water to combine into glucose. Chlorophyll contains enzymes and superoxide dismutase, a copper-containing protein found in mature red blood cells. This enzyme decomposes superoxide radicals in the body into a more manageable form, thereby helping to slow down the aging process.
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Chlorophyll is the pigment that algal and plant cells use to absorb solar energy in the form of sugars. This process known as photosynthesis, involves chlorophyll, sunlight, water, and CO2. In lakes most of the chlorophyll is associated with phytoplankton and periphyton. Since chlorophyll is mostly found algae, this method gives a way to estimate total algal biomass in the lake and its distribution.
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Chlorophyll is the molecule that traps this 'most elusive of all powers' - and is called a photoreceptor. It is found in the chloroplasts of green plants, and is what makes green plants, green. The basic structure of a chlorophyll molecule is a porphyrin ring, co-ordinated to a central atom. This is very similar in structure to the heme group found in hemoglobin, except that in heme the central atom is iron, whereas in chlorophyll it is magnesium.
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Chlorophyll refers to a complex of molecules (in plants and algea) that contain Mg and basic poryphrin ring structure. They are the molecules that give plants the green pigment. The function of chlorophyll in plants is to absorb sunlight, which is an essential requirement for plants to carry out photosynthesis. Photosynthesis is a process in which plants synthesize carbohydrates using sunlight, CO2 and water.
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Chlorophyll is the green pigment in plants that allows them to create energy from light – to photosynthesize. By measuring chlorophyll, you are indirectly measuring the amount of photosynthesizing plants found in a sample. In a lake water sample, these plants would be algae or phytoplankton. Chlorophyll is a measure of all green pigments whether they are active (alive) or inactive (dead). Chlorophyll a is a measure of the portion of the pigment that is still active; that is, the portion that was still actively respiring and photosynthesizing at the time of sampling.
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Chlorophyll is a chlorin pigment, which is structurally similar to and produced through the same metabolic pathway as other porphyrin pigments such as heme. At the center of the chlorin ring is a magnesium ion. The chlorin ring can have several different side chains, usually including a long phytol chain. There are a few different forms that occur naturally, but the most widely distributed form in terrestrial plants is chlorophyll a. The general structure of chlorophyll a was elucidated by Hans Fischer in 1940, and by 1960, when most of the stereochemistry of chlorophyll a was known, Robert Burns Woodward published a total synthesis of the molecule as then known.[3] In 1967, the last remaining stereochemical elucidation was completed by Ian Fleming,[4] and in 1990 Woodward and co-authors published an updated synthesis.[5]
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