منابع مشابه
Structure of saccharides
It is estimated that approximately 4x10 tons of carbohydrates are biosynthesized each year on earth by plants and photosynthesizing bacteria. The majority of these carbohydrates are produced as polysaccharides. Polysaccharides are macromolecules consisting of a large number of monosaccharide residues. They are sometimes also called glycans. (The term 'glycan' is also used for the saccharide com...
متن کاملStructure of saccharides
Standard monosaccharides are widely distributed in nature and easily obtained by degredation of polysaccharides or isolation from various materials for example plants, microorganisms, yeast, marine sources or milk. However, the structures of many sugars which are known today are different from the general formula Cn(H2O)n. They are modified by amino groups or deoxygenation to name but a few. Ma...
متن کاملInfluence of saccharides production
The symbols Gn , Gm , and Gx represent straight-chain malto-oligosaccharides containing n, m, and x units of (I ->4)-Cl.-D-glucopyranose; cGx is a CD composed of x units. A D-glucose unit at the non-reducing end of a (I ->4)-X-D-glucopyranosyl chain appears to be transferred by way of either 0-4 or C-4 to either C-I or 0-1 of another D-glucose unit that functions as a suitable donor. A variety ...
متن کاملStructure of saccharides
Carbohydrates exist as aldoses, which are polyhydroxyaldehydes, and ketoses, being polyhydroxyketones. Their open–chain forms can be suitably represented by Fischer projections. Aldoses and ketoses can be of different chain length and are all derived from glyceraldehyde. A formal insertion of a stereogenic (HCOH)–group between the carbonyl carbon atom and the α–C–atom of glyceraldehyde leads to...
متن کاملNon - Reducing Saccharides : Floridosides and Sucrose
The none reducing sugar floridosides and sucrose, which are abundant in photosynthetic red algae and green plants, respectively, are recognized as the initial stable neutral saccharides produced in large quantity. In the fifties, when the author started a research program on the assimilation of translocated neutral saccharides in sink organs, live red algae were not readily available and the st...
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ژورنال
عنوان ژورنال: Nature
سال: 1967
ISSN: 0028-0836,1476-4687
DOI: 10.1038/215216b0