Abstract:
:1. The metabolic activity of the gastrointestinal microflora can be modified by numerous factors derived from the host, the host's environment, and the flora itself. 2. Marked differences exist in microbial composition and metabolism of the gut floras of different species of animal, and in the degree of colonization of the various regions of the gut. 3. The microbial flora changes with age, particularly in early infancy, and developmental changes in in vivo metabolism attributable to the gut flora have been noted for methylmercury. 4. Gastrointestinal disease can have a profound effect on microbial colonization and metabolism in the upper regions of the human gut. In particular, hypochlorhydria can lead to elevation in bacterial numbers, and nitrite and nitrosamine concentrations in gastric juice. 5. Environmental factors such as drugs (particularly antibiotics), diet, and xenobiotics can modify microbial metabolism and toxicity of foreign compounds. In some cases exposure to xenobiotics (e.g., cyclamate, rutin) results in metabolic adaptation and increased biotransformation of the foreign compound. 6. By their fermentation of dietary residues and endogenous carbohydrates, the gut bacteria produce acids which can lower lumenal pH and, in turn, modify bacterial enzyme activities. However, the changes in activity appear to be enzyme specific, some increasing with pH and others being inversely related to pH of incubation.
journal_name
Drug Metab Revjournal_title
Drug metabolism reviewsauthors
Rowland IRdoi
10.3109/03602538808994135subject
Has Abstractpub_date
1988-01-01 00:00:00pages
243-61issue
3-4eissn
0360-2532issn
1097-9883journal_volume
19pub_type
杂志文章,评审abstract::The present paper has discussed available test systems for determination of the response of G-6-PD-deficient human erythrocytes to environmental agents. The limitations and advantages of each model have been examined, and the results of research using each model have been presented. The future development of suitable ...
journal_title:Drug metabolism reviews
pub_type: 杂志文章,评审
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journal_title:Drug metabolism reviews
pub_type: 传,历史文章,杂志文章
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journal_title:Drug metabolism reviews
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journal_title:Drug metabolism reviews
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journal_title:Drug metabolism reviews
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