BIODETERIORATION OF RUBBER PDF

Aromatic compounds are among the most persistent of these pollutants and lessons can be learned from the recent genomic studies of Burkholderia xenovorans LB and Rhodococcus sp. These studies have helped expand our understanding of bacterial catabolism , non-catabolic physiological adaptation to organic compounds , and the evolution of large bacterial genomes. First, the metabolic pathways from phylogenetically diverse isolates are very similar with respect to overall organization. Thus, as originally noted in pseudomonads , a large number of "peripheral aromatic" pathways funnel a range of natural and xenobiotic compounds into a restricted number of "central aromatic" pathways.

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However, this technique restricts the growth of microorganisms to the perimeter of the samples and is less satisfactory as a long term test. In a liquid medium, there should not be any problem for the microorganisms to gain access to the inorganic and organic nutrients as well as oxygen. Many experimental trials were carried out in liquid media under dynamic and static conditions with Streptomyces lipmanii NCIMB as test organism. This led to the development of the modified batch processes.

The modified tests allowed experiments to be performed over a long period of time without concern of accumulation of toxins from the leachable antimicrobial additives in the rubber samples and the metabolites from the utilisation of carbon sources by the microorganisms. The test procedure developed proved to be very reproducible and repeatable. The use of neutral chemically defined media with no added carbon source, the absence of strong oxidation catalysts coupled with the use of proper control samples defined the least vigorous conditions for biodeterioration of rubber compounds.

On the other hand, the degradation of the rubber compounds under field and semi-field tests is likely to be a combined effect of biodeterioration, hydrolytic degradation, leaching and oxidation of samples.

Five strains of fungi and four strains of actinomycetes were tested against five carbon black-filled seal compounds. Among all the species tested, Nocardia was found to be the most aggressive group of microorganisms in affecting the rubber samples. It was found that besides the physical dimensions, types and formulations of rubber compounds; test conditions such as temperature, agitation speed, pH; amount of rubber sample used per unit volume of test medium, and renewal or non-renewal of test media also played an important role in affecting the activities of microorganisms towards rubber compounds.

AIKIDO SZTUKA WALKI DLA DENTELMENW PDF

Microbial biodegradation

However, this technique restricts the growth of microorganisms to the perimeter of the samples and is less satisfactory as a long term test. In a liquid medium, there should not be any problem for the microorganisms to gain access to the inorganic and organic nutrients as well as oxygen. Many experimental trials were carried out in liquid media under dynamic and static conditions with Streptomyces lipmanii NCIMB as test organism. This led to the development of the modified batch processes. The modified tests allowed experiments to be performed over a long period of time without concern of accumulation of toxins from the leachable antimicrobial additives in the rubber samples and the metabolites from the utilisation of carbon sources by the microorganisms. The test procedure developed proved to be very reproducible and repeatable. The use of neutral chemically defined media with no added carbon source, the absence of strong oxidation catalysts coupled with the use of proper control samples defined the least vigorous conditions for biodeterioration of rubber compounds.

HIGH-PERFORMANCE THIN-LAYER CHROMATOGRAPHY HPTLC BY MANMOHAN SRIVASTAVA PDF

Microbial Deterioration of Rubber

Biodeterioration of Various Materials Microbiology Article Shared by In this article we will discuss about the biodeterioration of various materials. Biodeterioration of Stored Plant Food Material: The stored unprocessed plant material fruits, seeds, etc. This kind of spoilage is called biodeterioration. However, loss of plant materials before harvest is covered in plant pathology.

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