Nitrogenous substances

The Lassaigne procedure for detecting nitrogen in organic compounds frequently gives unsatisfactory results with explosive compounds (diazonium salts, polynitro compounds and the like) and with certain volatile nitrogenous substances, such as bases, their acyl derivatives or their salts. These difficulties... 

Crude protein = %nitrogen X 6.25. Does not accurately reflect true protein content. Algal cells may contain nonprotein nitrogen substances, eg, 4—6% nucleic acids, dry wt basis. 

A remarkable variety of compounds in the Ca-(B,C,N) system has opened a window for research in related fields. With the elements boron, carbon and nitrogen, substance classes such as borocarbides, boronitrides, and carbonitrides can be considered to contain anionic derivatives of binary compounds B4C, BN, and C3N4. Until now, most compounds in these substance classes have been considered to contain alkali, alkaline-earth, or lanthanide elements. Lanthanide borocarbides are known from the work of Bauer [1]. Lanthanide boronitrides represent a younger family of compounds, also assigned as nitridoborates [2] following the nomenclature of oxoborates. 

In relationship to their living conditions, yeasts like Saccharomyces cerevisiae have developed a large number of transport systems which take up nitrogenous substances present in the external medium, and accumulate them in unmodified form (for... 

Nhro amines aod other complex nitrogenous substances... 

The symptoms of HE are thought to result from an accumulation of gut-derived nitrogenous substances in the systemic circulation as a consequence of shunting through portosystemic collaterals bypassing the liver. These substances then enter the CNS and result in alterations of neurotransmitters that affect consciousness and behavior. 

Hepatic effects - If encephalopathy due to hepatic failure occurs, discontinue treatment to avoid further administration of nitrogenous substances. 

In 1935, Zemplen applied the Wohl reaction to octa-O-acetylcello-biononitrile,40 and obtained amorphous, nitrogenated substances that he supposed to be acetamido derivatives. His aim being the demonstration of the structure of the reducing disaccharides through successive degradation of their acylated nitriles to the lower aldo-biose, he discontinued these studies. 

In addition to the pathways for synthesis and degradation of nitrogenous substances, many organisms have specialized metabolism for incorporation of excess nitrogen into relatively nontoxic excretion products. All of these aspects of nitrogen metabolism will be dealt with in this and the following chapter. 

Efforts are being made to clarify the relationships of auxins with metal ions present in plant systems.42- 1 This topic is irrelevant here, except for noting that it is considered that the auxins are transported to centers of high metabolic activity where they may act as mobilization centers for the metallic ions. Whether or not this view will hold is still not clear however, it has been found that carbohydrates and nitrogeneous substances are strongly attracted to these centers of induced metabolism. 

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