Plants chlorophylls

In plants, chlorophyll is the pigment that absorbs radiant energy from the Sun. This allows the transfer of electrons from water to carbon dioxide, creating the products glucose and oxygen. The equation for photosynthesis is ... 

In one way or the other, the Sun is responsible for most of the Earth s energy. Green plant (chlorophyll) photosynthesis has provided the basis of... 

Photosynthesis in phytoplankton and higher plants Chlorophyll for aquatic monitoring Marine science 61, 62... 

The chlorophylls are responsible for the green colour of nearly all plants. The isomers, chlorophyll a and chlorophyll b exist in a 3 1 ratio in plants. Chlorophylls are magnesium-chelated tetrapyrroles with an esterified 20-carbon alcohol, phytol. Acidic conditions can cause the replacement of magnesium for hydrogen and change the chlorophyll into pheophytins. The pheophytins are brown in colour, and are normally undesirable in most foods. 

It is a matter of conjecture as to what extent the much longer cycles of biological processes, over 1 year in particular, may be determined by the seasonal variations of the intensity of sunlight. In many green plants chlorophyll is degraded slowly in the autumn, and in its place quite different pigments are formed (anthocyanins). 

Figure 2.12 Absorption spectra of various pigments from algae and plants chlorophyll a (—),...

Milk fat contains small quantities of phytanic and pristanic acid. Phytanic acid is produced by bacterial cleavage of the phytol side chain of plant chlorophyll in the rumen. Some phytanic acid is converted to pristanic acid by a-oxidation in the liver. Both of these branched-chain acids are agonists for PPARa at physiological concentrations (Parodi, 2004). Milk fat from cows fed cannery fruit and vegetable waste no doubt contains other interesting phytochemicals with anti-cancer potential. 

The substances from the tetrapyrrole class are remarkable both through the very deep colour and through the extreme stability to chemical and physical agents, which naturally go together according to the resonance theory. To this class belong the coloured constituent of the blood haemin and of plants chlorophyll, all derivatives of porphyrin and also the artificial pigments discovered by Linstead, the phthalocya-... 

Clones - a part of a plant, which once removed from a parent plant is used to make another plant Chlorophyll - what makes plants look green Copper - a trace element... 

JP Thornber, JP Markwell and S Reinman (1979) Plant chlorophyll-protein complexes Recent advances. Photochem Photobiol 29 1205-1216... 

In the human body, magnesium ensures that the body s enzymes function correctly. Magnesium is also important to green plants. Chlorophyll, which is essential in photosynthesis (which, in turn, is essential for the survival of green plants), contains magnesium. 

The interaction of light with any molecule always takes place at the level of the photon. In photosynthesis, chlorophyll is the molecule that absorbs photons. It cannot absorb any photon — it is constrained by the structure of its bonds to absorb photons with very particular quantities of energy. Plant chlorophyll absorbs photons of red light, with a wavelength of 680 nanometres. In contrast, the anoxygenic purple photosynthetic... 

Chlorophyll a occurs in all types of plants and in algae. Chlorophyll b is found primarily in land plants. Chlorophyll... 

Phytol, a long-chain alcohol, appears as an ester in plant chlorophyll. When consumed as part of the diet, phytol is converted to phytanic acid (see Figure 12.3). 

The plant chlorophylls have a rra s-configuration in the D ring but it has recently been shown that phaeophobides with the unnatural cij-configuration may be prepared by photochemical reduction of zinc porphyrins. ... 

A new approach recently was taken to maintain an excess of soluble scavenging metal in a mud and to minimize the adverse effects of the metal ion. The metal ion is bonded loosely with an organic compound (ligand) that is highly water-soluble. These organometallic compounds are commonly called metal chelates. Examples are hemoglobin in blood (iron chelate) and plant chlorophyll (magnesium chelate). 

In high light plants, chlorophyll-protein complexes were... 

Chlorophyll photosynthetic potentials (CPP) may be calculated as the" area under the curve of chlorophyll dynamics in the whole plant. Chlorophyll content was determined by spectrophotometery method. 

The green color of plants is due to chlorophyll, a magnesium complex of a modified porphyrin. This pigment is present in chloroplasts, one or more of which can be present in cells, depending on the plant. Chlorophyll-a is an ester of the long-chain alcohol phytol, which helps solubilize the pigment in the chloroplasts. 

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