Denitrification

Classification Escherichia coli is a bacterium that is mostly found in humans and other animals. It is a unicellular micro-organism, making its Domain and Kingdom Bacteria. E. coli’s Phylum is Proteobacteria because it is a gram-negative bacterium. It is also in the Phylum Proteobacteria because of the lipopolysaccharides that protect the cell membrane. E. coli is a facultative anaerobic G- bacterium, making its Class Gamma Proteobacteria. Because of its rod-shape, E. coli’s Order is…

rotation promotes N leaching (Kessavalou et al., 1998; Sainji et al., 2009). This occurs through leaching, volatilization and denitrification (Sainji et al., 2009). Tillage has a similar impact as fallow on N leaching and also affects SOM content, soil structure and soil biological activities (Martens, 2001). As main channels for N losses, N volatilization, leaching and denitrification become prominent when N mineralization activity occurs under favourable conditions for these N losses. Tillage…

NOx burners to certain sites and, since 2005, all new upstream units. Moreover, corrective measures have been applied, such as the installation of gas denitrification systems and the production of combustion urea. Certain countries such as the Netherlands, Germany and France, where Total conducts its activity, have been modernized with denitrification systems flue gas using urea or ammonia as the…

INTRODUCTION Worldwide, air pollution is a growing threat to human health and the natural environment. One of the major effects of air pollution is acid rain and it is caused by sulfur dioxide (SO2) and nitrogen oxides (NOx) gases. The combustion of high sulphur content fossil fuels can release harmful toxic gases into the air and therefore pose serious environmental problems. Coal, oil and natural gas are major energy resources available in environment where as fuel combustion processes and…

2. Introduction Nitrogen fertilizer can aid increase crop production and provide more food for the growing population. Since earlier ages, people has shown preoccupation about soil fertility and soil exhaustion (Strawn, Bohn, & O'Connor, 2015). Some management practices such as manure application or crop rotation were known by Chinese 3000 years ago (Strawn, Bohn, & O'Connor, 2015). However, it was just in the last-century that the crop yield increased dramatically. Improvements of hybrids, soil…

cycle can occur throughout the biological and physical processes. The five main processes of the nitrogen cycle through the biosphere, atmosphere, and geosphere includes the nitrogen fixation, assimilation, nitrification, ammonification, and denitrification. Many of those processes are carried out by a microbes, either in their effort on harvesting energy or to accumulate nitrogen in a form needed to their growth. The Earth’s atmosphere is consists of 78% nitrogen. The nitrogen cycle is one of…

Discussion To understand the functional diversity, composition, structure and dynamics of rhizospheric diazotrophs communities under sugarcane-legume intercropping, we carried out this study to examine the effect of different cultivation systems on the stability of the soil properties and rhizospheric diazotrophs. Previous studies have investigated that soil microbial diversity, soil enzyme activities and crop yield could be affected by land management practices and all these soil properties…

ultimately lead to a large increase in the export of organic carbon. This could then lead to anoxia in the deeper oceans that support the conditions needed for the processes of methanogenesis and denitrification to take place. The end product of methanogenesis is methane (CH4). During the process of denitrification, the intermediate product of nitrous oxide (N2O) is produced. Both of these products are very potent greenhouse gasses on a much higher magnitude than CO2. The…

The removal of carbon dioxide in Recirculating Aquaculture Systems (RAS) has been an important topic of research due to the increasing amount of recirculating aquaculture systems being employed in the aquaculture industry. Carbon dioxide, as well as ammonia, are excreted by the fish and can be present in high quantities. Elevated levels of CO2 accumulation within the recirculating water could have toxic effects on fish. The maximum level of CO2 and ammonia that can be present in the tanks…

Other microorganisms may help defend the sponge with secondary metabolites or processes. Various beta- and gammaproeobacteria are responsible for denitrification in the sponge Geodia barrette. (Webster and Taylor, 2012). Additionally, a pure culture of an ammonia-oxidizing archaea (AOA) in the phylum Crenarchaeota was isolated from a sponge. This culture confirmed predictions of chemoautotrophic ammonia…