Dissimilation

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Related to Dissimilatory: Dissimilatory nitrate reduction

Dissimilation

 

in biology, the opposite of assimilation in the process of metabolism, consisting in the decomposition of organic compounds and conversion of protein, nucleic acids, fats, and carbohydrates (including those ingested) into simple substances. A number of dissimilation processes—respiration, fermentation, and glycolysis—play the central role in metabolism. As a result of these processes, energy contained in the molecules of complex organic compounds is released, partially to be transformed into adenosinephosphoric acids (chiefly ATP). The fundamental end products of dissimilation in all organisms are water, carbon dioxide, and ammonia. In animals these products are eliminated as they accumulate. In plant organisms CO2, partially, and NH3, totally, are used in the biosynthesis of organic matter, thus serving as the primary materials for assimilation.

The inseparable link between dissimilation and assimilation assures constant tissue renewal in organisms. Thus, in human blood one-half of the existing albumin is exchanged for new albumin molecules in ten days; the life span of erythrocytes is about four months. The relationship of the intensity of assimilation and dissimilation changes in relation to the stage of development, age, and physiological condition of the organism. The growth and development of the organism are characterized by the predominance of assimilation, which is manifested in the formation of new cells, tissues, and organs; their growth and differentiation; and in a general increase in body weight. In some pathological conditions and in starvation dissimilation usually predominates over assimilation, leading to a decrease in body weight.

S. E. SEVERIN and G. A. SOLOV’EVA


Dissimilation

 

in linguistics, one of the kinds of combinative sound changes in the course of speech. It occurs when one of two identical or similar speech sounds (adjacent or nonadjacent) changes to another distinct or less similar sound. Two examples of dissimilation are Latin peregrinum and Russian piligrim and Latinfebruaris and Russian fevral’.

References in periodicals archive ?
Lovley, "Reductive precipitation of gold by dissimilatory Fe(III)-reducing bacteria and archaea," Applied and Environmental Microbiology, vol.
Bacterial dissimilatory reduction of arsenic(V) to arsenic (III) in anoxic sediments.
Nitrate metabolisme in Azospirillum brasilense: a molecular approach for the identification of assimilatory and dissimilatory pathways PhD thesis.
Pore-fluid iron isotope measurements have so far been restricted to the continental shelves where the supply of carbon is typically high and dissimilatory iron reduction is extensive, precluding comparisons with low-carbon, deep-water environments.
En este proceso, tambien llamado DNRA (por sus siglas en ingles: Dissimilatory Nitrate Reduction to Ammonium), el N[O.
and ammonium ion soil concentration analyses were performed in the investigated soil layers before the experiment and in the soil columns after the experiment to check whether a process of dissimilatory respiration was present in columns during the experiment.
Occurrence of sulphate-reducing bacteria in human faeces and the relationship of dissimilatory sulphate reduction to methanogenesis in the large gut.
Lovley D, Phillips E (1998) Novel of microbial energy metabolism: Organism carbon oxidation coupled to dissimilatory reduction of iron and manganese.
Phylogeography of sulfate-reducing bacteria among disturbed sediments disclosed by analysis of the dissimilatory sulfite reductase genes (dsrAB).
2006) recently constructed a genome-scale metabolic model of metabolism in the dissimilatory Fe(III) reduction with the objective of improved understanding of this unique mode of metabolism.
This is, however, harder to show, given the wide range of dissimilatory processes that are frequently grouped together (see Suzuki 1998).
Nitrate may also be removed from sediment by biotic dissimilatory N[O.