Organs in plants

In the biochemistry of D-fucose and its derivatives, there are larger lacunae in our knowledge. The biosynthesis of D-fucose has not been examined, so that it is not yet known how this sugar is produced in the organisms that contain it (mainly plants and some micro-organisms). In plants, it occurs especially in the form of steroid glycosides, whereas, in micro-organisms, it has been particularly located in antibiotic substances. It has not been identified in animals. 

Staiger, C.J., Gibbon, B.C., Kovar, D.R., and Zonia, L.E., 1997, Profilin and actin-depolymerizing factor Modulators of actin organization in plants. Trends Plant Sci. 7 275-281. 

Many questions about the molecular organization in plant cell walls... 

Wardlaw, C.W A commentary on Turing s diffusion-reaction theory of morphogenesis. New Phytol. 52(1), 40-47 (1953). http //www.jstor.org/stable/2429242 Wardlaw, C.W The chemical concept of organization in plants. New Phytol. 54(3), 302-310 (1955). http //www.jstor.org/stable/2429313... 

Tryptophan is an essential amino acid for most organisms. In plants and bacteria, this compound is derived from chorismic acid. Many groups of secondary compounds are formed from tryptophan among these are several simple amine derivatives and a number of alkaloids. 

So far there is no known specific biochemical function for nickel in animal organisms. In plants and microorganisms, some metal-loenzymes containing nickel have been found. Such an enzyme is urease, found in soybeans, other legumes (this enzyme was first isolated from the seeds of the Jack bean, Canavalia ensiformis), rice and tobacco. Molecule of urease (580 kDa) contains 12 nickel atoms in six subunits. In the active enzyme centre, two nickel atoms are coordinated by four histidyl residues and one residue of e-N-carbamoyl lysine, while the carbamoyl group and one molecule of water form a bridge between the two nickel atoms. Urease catalyses the hydrolysis of urea to ammonia and carbamate (carbamic acid), which is hydrolysed spontaneously to hydrogen carbonate (bicarbonate) and ammonium ions ... 

Biosynthesis of Aromatic G>mpounds. Compounds containing the benzene ring, in general, are not synthesized by the animal organism. In plants and microorganisms, such substances can at times be formed in huge amounts, as exemplified by lignin, a major component of woody material. 

Embryo The structure that develops in plants and animals from a zygote through repeated division of cells that differentiates into tissues and organs. In plants, the embryo forms part of the seed. 

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