Accelerated aging process

Contraindications Taken too soon after food may cause nausea. Mazatec Indians claim that constant use of these mushrooms over extended period will accelerate aging process. One death (6-year-old boy) was attributed to the ingestion of a large number of P. baeocystis, which contains baeocystin and nor-beaocystin. Normal use... 

Since Washington summers are known for high temperature and humidity levels, it might be said that the collections at the Library of Congress have suffered from a natural accelerated aging process. The majority of nineteenth and twentieth century books and unbound items that are brittle in the Library of Congress, and no doubt other collections,... 

There is suggestive evidence that 03 exposure accelerates aging processes. Some investigators suggest that aging is due to irreversible crosslinking between macromolecules, principally proteins and nucleic acids. Animals exposed to 0.1 ppm 03 may increase the susceptibility to bacterial infections. Exposed mice may have congenital abnormalities and neonatal deaths. 

Experiments on the stress-chemllumlnescence (SCL) behavior of TGDDM/DDS epoxy and nylon 66 specimens were performed under various conditions to determine the potential of the technique to measure stress-induced and stress-accelerated aging processes. Representative results of typical SCL experiments with epoxy specimens are shown In Figures 2 and 3 where emitted light (photon counts/s) Is plotted as a function of time and stress. In both... 

B. Accelerated Aging Process in Nontransformed RER+ Cells Possible Role of Very Early Telomerase Reactivation in Senescence Rescue and Possible Impact on Karyotype... 

Theoretical model considerations are also involved when the results of long-term tests obtained under accelerated test conditions are analysed and extrapolated to application conditions. Increase in concentration of influencing substances or increase in mechanical loads may be used to accelerate ageing processes. However, the most important accelerating test condition is increase in temperature. The following consideration can illustrate this (Landau and Lifshitz 2000). 

Predicting the changes in properties that will occnr over an extended period of natural ageing is a problem that occupies many indnstrial scientists. Even though techniques have been refined, accelerated ageing processes have been... 

Report 84 Rheology and its Role in Plastics Processing, P. Prentice, The Nottingham Trent University. Report 110 Long-Term and Accelerated Ageing Tests on Rubbers, R.P. Brown, M.J. Forrest and G. Soulagnet, Rapra Technology Ltd. 

In thermal-swing regeneration, the bed may need a substantial time to reach the regeneration temperature. The high temperatures may also affect the product and accelerate the ageing processes in the adsorbent. 

There is some suggestive evidence that exposure to ozone accelerates the aging process(es). Bjorksten and Bjorksten and Andrews have presented evidence that aging is due to irreversible cross-linking between macromolecules, principally proteins and nucleic acids. Aldehydes were included in the list of cross-linking agents, and these can be produced in the lung as a result of ozone exposure. ... 

Various problems related to the construction and performances of these batteries, such as changes in materials of membranes and additives both to the electrode materials and to the electrolyte, were studied in recent years. Some instability of the silver electrode during such storage period and the ways of avoiding these difficulties were studied and discussed [347]. Reserve activated silver oxide-zinc cells were constructed [348] with synthetic Ag20 and Pb-treated zinc electrodes were produced by a nonelec-trolytic process. The cells were tested before and after thermally accelerated aging. 

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