Danger degradation process

In spite of the differences in fine details the task is similar in all the three main (thermo oxidative- UV- and radiation) degradation processes, namely to control and/or diminish the danger of deterioration of properties either by... 

UV-b radiation has wavelengths in the range 290-320 nm. It is much more dangerous to the skin than UV-a because each photon possesses more energy. In consequence, the photolytic processes caused by UV-b are more extreme than those caused by UV-a. For example, UV-b causes thermal degradation of the skin (we call it sunburn ) but, additionally, it inhibits DNA and RNA replication, which is why over-exposure to UV-b will ultimately lead to skin cancer. 

Nitrophenols are persistent pollutants and commonly found in industrial wastewaters. Degradation of nitrophenols to less dangerous materials or mineralization is difficult by natural process involving biodegradation or oxidation. Nitrophenols are commonly found in degradation of pesticides such as parathion and nitrofen. Kiwi et al. (1994) showed efficient photo-and dark oxidation via Fenton-like reactions on 2 and 4-nitrophenols. Photolysis of acidic solutions of H2Oz give OH radicals as primary photoproducts (Baxendale and Wilson, 1957) as follows ... 

Most PMF search engines allow a mass for the protein to be entered the search will then consider only database entries within a window around this mass. This can be dangerous, as proteins are subject to processing/degradation, which can significantly increase or decrease their molecular mass. Mascot uses a more complex method of applying this parameter, but in most cases this can be left blank. 

This process was developed for cellulose-rich raw materials since high concentration of the acid may cause degradation of the pentoses in hemicellulose to furfural derivatives. The ethanol yield is usually about 35%. However, corrosion problems and the need for higher capital investment and dangers associated with the recovery of the concentrated acid make this method less attractive. Furthermore, during combustion of lignin that is contaminated with hydrochloric acid there is some risk of dioxin emissions. 

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