Sludges derived from wastewater treatment are foul-smelling, biologically unstable substances. As well as containing numerous pathogenic microorganisms, they also consist of organic matter that can be used as agricultural fertilizer. Legislation nevertheless requires sludges to be virologically tested prior to spreading by the counting of infectious enterovirus particles. This method, based on ...

Analysis of deoxyribonucleic acid (DNA) from four species of Clostridium, including two thermophiles, a mesophile, and a psychrophile, revealed no obvious relationship between growth temperature and DNA base composition. The melting temperatures (T(m)) of the DNA from the four species varied no more among the thermophilic, mesophilic, and psychrophilic species than among many related mesophilic...

Safety of patients and dental personnel requires the appropriate microbiological water quality in dental units. During treatment, patients and dental workers are exposed both to direct contact with bacteria-contaminated water in the form of splatter and with contaminated water aerosol emitted during work by unit handpieces, including rotating and ultrasonic instruments. The aim of the study was...

The halophile environment has a number of compelling aspects with regard to the origin of structured polypeptides (i.e., proteogenesis) and, instead of a curious niche that living systems adapted into, the halophile environment is emerging as a candidate "cradle" for proteogenesis. In this viewpoint, a subsequent halophile-to-mesophile transition was a key step in early evolution. Several lines...

Fish are marketed as a food and consumed worldwide. During the production of food, contamination by microorganisms is possible through air, soil, water, surfaces, handlers, etc. The air does not have natural microbial composition, but it vehicle for transmission economic health interest because they associated with spoilage human diseases. objective this study was microbiological analysis in an...

Upadhyay, J. (Washington State University, Pullman) and J. L. Stokes. Temperature-sensitive hydrogenase and hydrogenase synthesis in a psychrophilic bacterium. J. Bacteriol. 86:992-998. 1963.-Hydrogenase and its synthesis were more heat-sensitive in psychrophilic strain 82 than in mesophilic Escherichia coli. The enzyme was not formed above 20 C by the psychrophile, whereas it was formed by E. ...

in this research work, the zinc extraction was investigated, using bioleaching process from a low grade zinc concentrate which was produced from the accumulated flotation tailings. zinc content was initially upgraded to 11.97% by flotation process. bioleaching experiments were designed and carried out by a mixed culture of acidithiobacillus ferrooxidans, acidithiobacillus thiooxidans, leptospir...

respect to the less stable mesophile. When focusing on different timeand lengthscales specific behaviors arise. At an atomistic scale, it is found that in the hyperthermophile a more regular alternation of rigid and flexible regions stabilizes a key part of the protein where the unfolding of the mesophile begins. We furthermore find that the conformational landscape of the hyperthermophile is c...