Related substances

Cellulose is the main component of the cell walls of plants. The so-called hemicelluloses and other related polysaccharides constitute a considerable proportion of plants (Chapter XII). Therefore, these substances are present in nearly all dietaries. None of the higher forms of life appears to be 

The disappearance of crude fiber from the digestive tract is extremely variable and depends in part upon the proportion of cellulose and hemi-celluloses, or pentosans, and also upon the presence of specific bacteria in the alimentary tract. The digestibility of the fibrous fraction appears to be inversely proportional to the lignin content of the foodstuff. Lignin does not appear to be digested. 

The content of fibrous material affects the biological value of various dietary essentials 67). In studies on children, Macy and co-workers 68) found that the content of fibrous material influenced the nitrogen retention and also the acid-base and the mineral balances. 

In dietaries particularly high in fibrous material, these facts must be given careful consideration in all quantitative determinations of nutritional value 69). Thus, the value that cellulose and related materials might have in human nutrition is concerned with their effect simply as bulk, which may be desirable in some instances 70). 

It has been claimed that the growth of chickens is promoted by the presence of cellulose in amounts from 5 to 15 % in complete but purified diets 71). Whether chickens have any ability to utilize cellulose, except through such microbiological activity as may occur in their alimentary tracts, has not been established. There is evidence that they can utilize sawmill wood waste when it is mixed with sugar molasses and fed in amounts up to 50% of the entire ration 72). There are numerous evidences that cattle, and to some extent other domestic animals, are able to utilize different sources of cellulose, especially when the sawdust or other product is mixed with molasses. 

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Chromatography is based upon the selective adsorption from solution on the active surface of certain finely divided solids. Closely related substances exhibit different powers of adsorption, so that separations, which are extremely difficult by ordinary chemical methods, may be effected by this means. When, for example, a solution of leaf pigments... 

Sterculic acid and related substances are the subject of an article in the July 1982 is sue of Journal of Chemical Education (pp 539-543)... 

Research in physiology carried out in the 1930s established that the lipid fraction of semen contains small amounts of substances that exert powerful effects on smooth mus cle Sheep prostate glands proved to be a convenient source of this material and yielded a mixture of structurally related substances referred to collectively as prostaglandins We now know that prostaglandins are present m almost all animal tissues where they carry out a variety of regulatory functions... 

Homologous series (Section 2 9) Group of structurally related substances in which successive members differ by a CH2 group... 

KETENES, KETENE DIFffiRS AND RELATED SUBSTANCES] (Vol 14) o-Acetoacetotoluidide [93-68-5]... 

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