Denitrifying microorganisms

G. T. Sperl and P. L. Sperl. Enhanced oil recovery using denitrifying microorganisms. Patent US 5044435, 1991. 

Schropp, S. J., and Schwarz, J. R. (1983). Nitrous oxide production by denitrifying microorganisms from the eastern tropical Pacific and the Caribbean Sea. Geomicrobiol. J. 3(1), 17—31. 

Kerner, M., Mayer-Miebach, E., Rathjen, A., Schubert, H. (1990). Reduction of nitrate content in vegetable food using denitrifying microorganisms. In R Zeuthen, J. C. Cheftel, C. Eriksson, T. R. Gormley, P. Linko, K. Paulus (Eds.), Processing and quality of foods. Food biotechnology Avenues to healthy and nutritious products Vol. 2. London and New York Elsevier Appl. Science. 

The microorganisms reduce the nitrate and produce sulfuric acid, which eventually dissolves the rock formation, thus releasing oil. The microorganisms can be denitrifying thiobacilli, such as T. denitrificans [1667]. 

Sublette [285] describes a process for desulfurizing sour natural gas using another commonly known chemolithotrophic microorganism, the aerobic bacterium T. denitrifi-cans. This patent describes a process wherein bacteria of the Thiobacillus genus convert sulfides to sulfates under aerobic conditions. Sublette defined the ideal characteristics of a suitable microorganism for the oxidative H2S removal from gaseous streams as ... 

Hutchins, S. R., Sewell, G. W., Kovacs, D. A. Smith, G. A. (1991b). Biodegradation of aromatic hydrocarbons by aquifer microorganisms under denitrifying conditions. Environmental Science and Technology, 25(1), 68-76. 

Total microbial populations are often higher in no-till soils. In a study comparing surface soils from long-term no-till and conventional tillage plots at seven United States locations, counts of aerobic microorganisms, facultative anaerobes, and denitrifiers in no-till soils were 1.14-1.58, 1.57, and 7.31 times higher, respectively, than in the surface of plowed soils (Doran, 1980). 

Cytochrome c is present in all organisms having mitochondrial respiratory chains plants, animals, and eukaryohc microorganisms. This electron carrier evolved more than 1.5 billion years ago, before the divergence of plants and animals. Its function has been conserved throughout this period, as evidenced by the fact that the cytochrome c of any eukaryotic species reacts in vitro with the cytochrome c oxidase of any other species tested thus far. Finally, some prokaryotic cytochromes, such as cytochrome c2 from a photosynthetic bacterium and cytochrome c 550 from a denitrifying bacterium, closely resemble cytochrome c from tuna heart mitochondria (Figure 18.23). This evidence attests that the structural and functional characteristics of cytochrome c present an efficient evolutionary solution to electron transfer. 

Molecular oxygen (O2) is the physiologically preferred terminal electron acceptor for denitrifying bacteria, and its presence represses denitrihcation enzyme synthesis and activity. Although some microorganisms are capable of performing... 

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