منابع مشابه
Biological role of D-amino acid oxidase and D-aspartate oxidase. Effects of D-amino acids.
D-Amino acids administered to animals are absorbed by the intestine and transported through the blood-stream to solid tissues where they are oxidized in vivo by D-amino acid oxidase and D-aspartate oxidase to produce the same compounds they do in vitro; i.e. NH3, H2O2, and the keto acid corresponding to the amino acid ingested. In the liver and kidneys of the animals, an inverse relationship ex...
متن کاملMinutes, days and years: molecular interactions among different scales of biological timing.
Biological clocks are genetically encoded oscillators that allow organisms to keep track of their environment. Among them, the circadian system is a highly conserved timing structure that regulates several physiological, metabolic and behavioural functions with periods close to 24 h. Time is also crucial for everyday activities that involve conscious time estimation. Timing behaviour in the sec...
متن کاملThe Swine Plasma Metabolome Chronicles "Many Days" Biological Timing and Functions Linked to Growth.
The paradigm of chronobiology is based almost wholly upon the daily biological clock, or circadian rhythm, which has been the focus of intense molecular, cellular, pharmacological, and behavioral, research. However, the circadian rhythm does not explain biological timings related to fundamental aspects of life history such as rates of tissue/organ/body size development and control of the timing...
متن کاملChristmas Days
Some of the achievements at festivities and exhibitions are greeted with surprise. It is not always possible to have the privilege of personal inspection, though those in charge of defectives are usually most ready to give of their precious leisure in showingvisitors what is being done.. The following notes giving different accounts of Christmas activities have been kindly sent to us. They may ...
متن کاملSixteen days.
When does a human being begin to exist? We argue that it is possible, through a combination of biological fact and philosophical analysis, to provide a definitive answer to this question. We lay down a set of conditions for being a human being, and we determine when, in the course of normal fetal development, these conditions are first satisfied. Issues dealt with along the way include: modes o...
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ژورنال
عنوان ژورنال: Nature
سال: 1958
ISSN: 0028-0836,1476-4687
DOI: 10.1038/1821576a0