pp. Essentially, aging is therefore the result of natural selection for pleiotropic genes which are beneficial early in life. For example, in plants the death of one, or more, cells benefit the organism as whole. By converting nicotinamide to niacin, it removes nicotinamide, which inhibits the activity of Sir2. Pleiotropy, natural selection and the evolution [...]
One argument against the somatic mutation theory comes from observations of inbred animals. However, scientists point out that this wear and tear theory of aging comes from insect observations. The damage begins at the level of molecules within our cells. And that damage accumulates over time. For example, few cells in the wing muscles of [...]
2 Rebbeca Gershmans observation that hyperbaric oxygen toxicity and radiation toxicity could be explained by the same underlying phenomenon oxygen free radicals. This involvement is not at all surprising as free radical chemistry is an important aspect of phagocytosis, inflammation, and apoptosis. PMID 8415630.^ Schulz TJ, Zarse Voigt Urban Birringer Ristow 2007. The situation in [...]
This happens becausechildrenare often not mentioned in particularly obscure, side branches ofgenealogicaltrees remote relatives. 159]. How does it happen that,afterhaving accomplished the miraculous success that led us from singlecellat conception through birth and then to sexual maturity and productiveadulthood including reading this article, the developmental programformedby biological evolution fails even to maintain the accomplishments ofitsown [...]
Early in Calvin Harley, of Geron Corporation and Jerry Shay of the University of Texas Southwestern Medical Center, announced the discovery of human gene that resets the number of replications of cell. There are many theories of aging. He found that human body cells are programmed to reproduce themselves finite number of times. Some theories [...]
ouroboros Says 4, at am Good point, Mstudent. Exp Gerontol 2003 388921923. This implies that SENS must be based on retuning adaptation, not repairing damage. But with humans at least it fits. Michael Says 3, at am AllI find Dr. Biochem Soc Trans 2003 312452454. had inferred Roses point from your earlier posting, exactly as [...]