Deterioration organism responsible

Table II. Types of Biological Deterioration of Wood and the Organisms Responsible...

Biodeterioration. For objects made out of organic materials, mold and insect attack are a principal cause of damage. Microbiological organisms can also be responsible for serious deterioration of outdoor stone. Museums, especially storage areas, are quite conducive to providing the conditions in which infestations can occur. Objects are stored in close proximity, and left untouched for prolonged periods, often with Htde if any ak movement. 

A patient developed atorvastatin-induced severe autoimmune hepatitis and a lupus-like syndrome. Although the drug was immediately withdrawn, the disease persisted and deteriorated to a fulminant form with acute hepatic failure. There was no response to conventional immunosuppression with glucocorticoids and azathioprine. Only the introduction of intense immunosuppressive therapy, as used in solid organ transplantation, led to a complete and sustained recovery. The patient had the HLA haplotypcs DR3 and DR4, which are well-known genetic factors associated with autoimmune diseases. 

Boiler Feed Waters.— Impurities in boiler waters not only reduce efficiency and capacity, but also impair quickness of response to demands for steam, increase the rate of deterioration of the boiler, and may produce dangerous conditions. The removal of deposits from a boiler nearly always involves considerable hard labor. Their prevention should be the aim in view. The unintelligent use of proprietary compounds is to be avoided. Some of them contain, besides reagents based on the water analysis, organic compounds which may loosen large masses of scale. 

In many cases the use of pigments is not a convenient way to prevent the absorption of damaging radiation by polymers. However, substances that are transparent in the visible region but have a high absorption coefficient in the ultraviolet can be used as filters for that part of the solar spectrum which is responsible for the deterioration of most polymers. Although many organic compounds have a suitable absorption spectrum for that purpose only very few can be used as ultraviolet absorbers a severe restriction is that they should be photochemically stable, otherwise the stabilization effect will not be durable and sensitization may occur. Ultraviolet absorbers that have found commercial application belong to five main families. 

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