Image Nitrogen Cycle.svg thumb 320px Nitrogen cycle. Denitrification is a microbially facilitated process ... 2 sub O and dinitrigen N2 . In terms of the general nitrogen cycle , denitrification completes the cycle .... L. Ingraham. 1983. Comparison of denitrification by Pseudomonas stutzeri , Pseudomonas aeruginosa ... basis of denitrification. Microbiol. Mol. Biol. Rev. 61 533 616. ref Generally several species ... DNRA as a nitrogen link, versus denitrification as a sink in a shallow estuary Laguna Madre ... use a non fermentable substrate. The Nitrogen Cycle Denitrification and its Relationship to N2 Fixation, p. 277 342. ref This is less common than denitrification in most ecosystems as a means of nitrate ... and nos nitrous oxide reductase among others ref Zumft, W. 1997. Cell biology and molecular basis of denitrification ..., R. Lowrance, B. Peterson, C. Tobias, and G. V. Drecht. 2006. Denitrification Across Landscapes .... Smith, J. A. D. Phillip, H. D. Ratcliffe, J. W. Drozd, and A. T. Bull. 1980. Anaerobic Growth and Denitrification ... required Denitrification takes place under special conditions in both terrestrial and marine ecosystem .... Tobias, and G. V. Drecht. 2006. Denitrification Across Landscapes and Waterscapes A Synthesis. Ecological ... denitrification only takes place in wikt anaerobic anaerobic environments where oxygen consumption ... first3 A. year 1985 title Relationship between photosynthesis and denitrification in planted ... , ref cite journal last Korom first Scott F. year 1992 title Natural Denitrification in the Saturated ... ref poorly ventilated corners of the ocean, and in seafloor sediments. Denitrification generally proceeds ... NO chem N 2 O chem N 2 g The complete denitrification process can be expressed as a redox reaction ... to identify denitrification processes in nature. Denitrification by rhizobia Rhizobia are soil bacteria ... nitrate s to support respiration. This denitrification pathway comprises the sequential reduction .... The enzymes involved in denitrification are nitrate , nitrite , nitric oxide and nitrous oxide reductase ... more details
Aerobic denitrification or co respiration the simultaneous use of both oxygen O sub 2 sub and nitrate NO sub 3 sub sup sup as oxidizing agent s, performed by various genera of microorganisms. ref name controversy cite journal last Robertson first Lesley A. coauthors J. Gijs Kuenen date 22 April 1984 title Aerobic denitrification a controversy revived journal Archives of Microbiology volume 139 issue 4 issn 0302 8933 url http www.springerlink.com content v34t52584g6r63t2 ref This process differs from anaerobic denitrification not only in its insensitivity to the presence of oxygen, but also in that it has a higher potential to create the harmful byproduct nitrous oxide. ref name soils cite journal last Lloyd first David date October 1993 title Aerobic denitrification in soils and sediments from fallacies to facts journal Trends in Ecology & Evolution volume 8 issue 10 url http www.sciencedirect.com science? ob ArticleURL& udi B6VJ1 4B0PBXH N4& user 4423& coverDate 10 2F31 2F1993& rdoc 1& fmt high& orig search& sort d& docanchor &view c& acct C000059605& version 1& urlVersion 0& userid 4423&md5 b4759cfa326f979b58c4bf6b9a4a465e doi 10.1016 0169 5347 93 90218 E pages 352 ref Nitrogen, acting as an oxidant, is therefore reduced in a succession of four reactions performed by the enzymes ... species nitrous oxide N sub 2 sub O . A simple denitrification reaction proceeds as chem NO 3 ... g 6 chem H 2 O Classically, it was thought that denitrification would not occur in the presence of oxygen ... denitrification does indeed occur in a broad range of Denitrifying bacteria microbial organisms .... The advantages of being able to perform denitrification in the presence of oxygen are uncertain ... to remove carcinogenic nitrate ions from drinking water. ref name soils Aerobic denitrification tends to produce more nitrous oxide N sub 2 sub O than anaerobic denitrification. The nitrous oxide ... pages 529 ref See also Denitrification Cellular respiration Nitrogen cycle Nitrogen fixation References ... more details
Context date October 2009 Simultaneous nitrification denitrification SNdN is a wastewater treatment process. Microbe Microbial simultaneous nitrification denitrification is the conversion of the ammonium ion to nitrogen gas in a single bioreactor . The process is dependent on floc characteristics, reaction kinetics, mass loading of readily biodegradable chemical oxygen demand , rbCOD, and the dissolved oxygen , DO, concentration ref name Tchobanoglous, 2003 Tchobanoglous, 2003 ref Microbiology The oxidation of the ammonium to nitrogen gas has been achieved with attached growth and suspended growth wastewater treatment processes. The most common bacteria responsible for the two step conversion are the autotrophic organisms, Nitrosomonas and Nitrobacter , and many different heterotrophs. The former obtain energy from the oxidation of ammonia , obtain carbon from carbon dioxide CO sub 2 sub , and use oxygen as the electron acceptor . They are termed autotrophic because of their carbon source and termed aerobes because of their aerobic environment. The heterotrophic organisms are responsible for denitrification or the oxidation of nitrate , NO sub 3 sub sup sup , to nitrogen gas, N sub 2 sub . They use carbon from complex organic compounds, prefer low to zero dissolved oxygen, and use nitrate as the electron acceptor. Systems Design The most common design uses two different basins one catering to the autotrophic bacteria and the second to the heterotrophic bacteria. However, SNdN caters to both in one basin with strict control of the DO. This has been done in two common approaches. One is to develop an oxygen Diffusion gradient by adding oxygen in one location in the basin. Next ... in the inner rings of the floc where denitrification occurs. This method is dependent on the floc ... the nitrification or the denitrification steps. The SNdN limitation due to partial active biomass ... Denitrification in a Single Reactor using Ciliated Columns Packed with Granular Sulfur. Water Quality ... more details
Unreferenced date April 2008 Denitrifying bacteria form a necessary part of the process known as denitrification as part of the nitrogen cycle , their primary purpose being to metabolism metabolise nitrogenous Chemical compound compounds , with the assistance of the nitrate reductase enzyme , to turn oxide s back to nitrogen gas or nitrous oxides for energy generation. This process takes place only in the absence of oxygen , as most denitrifying bacteria are facultative aerobe s prefers to use oxygen as their terminal electron acceptors , however, they could also utilize nitrate instead. Therefore, denitrification can only be performed under wikt anaerobic anaerobic conditions. This is the main reason why denitrification mostly occurs in the deep substrata of the soil , or in areas of stagnant water . The process of denitrification lowers the fertility of the soil and thus is less common in areas where the land is rather well Tillage cultivated . But this loss of nitrogen to the atmosphere can eventually be regained via introduced food and water, as part of the nitrogen cycle. Some nitrogen may also be nitrogen fixation fixated by species of nitrifying bacteria and the cyanobacteria . Denitrification also becomes the key pathway for Microbial metabolism Denitrification nitrate as electron acceptor dissimilative nitrate reduction , which is the process in which nitrates are reduced from the soil, the former being highly toxic for living organisms. Unlike its antithesis, denitrification tends to produce large amounts of by product s. The most common denitrification process is basically outlined below, with the nitrogen oxides being converted back to gaseous nitrogen as opposed to that of nitrifying bacteria 2 NO sub 3 sub sup sup 10 e sup sup 12 H sup sup N sub 2 sub 6 H sub 2 sub O As can be seen, the result is one molecule of nitrogen consisting of two atoms and six molecules of water. Denitrifying bacteria themselves include several species of pseudomonas , alkaligene ... more details
italic title Taxobox name Pseudomonas tuticorinensis color lightgrey image image width 240px image caption regnum Bacterium Bacteria phylum Proteobacteria classis Gamma Proteobacteria ordo Pseudomonadales familia Pseudomonadaceae genus Pseudomonas species P. tuticorinensis binomial Pseudomonas tuticorinensis binomial authority Sreenivasan 1956 Pseudomonas tuticorinensis is a Gram negative , ocean marine denitrification denitrifying bacterium ref cite journal unused data Sreenivasan, A, and Venkataraman, R title Pseudomonas tuticorinensis n. sp., A Marine Denitrifying Bacterium journal Indian Academy of Sciences volume 25 pages 294 295 year 1956 ref . The type strain is ATCC 12230. References Reflist Category Pseudomonadales Proteobacteria stub ... more details
title Studies on denitrification. X. The denitrifying enzyme" as a nitrite reductase and the electron donating system for denitrification journal J. volume Biochem. pages 463 471 pmid 5354021 issue 4 cite journal author CHUNG CW, NAJJAR VA date 1956 title Cofactor requirements for enzymatic denitrification ... date 1996 title Characterization of the membranous denitrification enzymes nitrite reductase cytochrome ... of denitrification journal Microbiol. Mol. Biol. Rev. volume 61 pages 533 616 pmid 9409151 issue ... In vivo studies disprove an obligatory role of azurin in denitrification in Pseudomonas aeruginosa ... more details
SHARON S ingle reactor system for H igh activity A mmonium R emoval O ver N itrite is a sewage treatment process. A partial nitrification process of sewage treatment used for the removal of ammonia and organic nitrogen components from wastewater flow streams. The process results in stable nitrite formation, rather than complete oxidation to nitrate . Nitrate formation by nitr a fying bacteria such as Nitrobacter is prevented by adjusting temperature, pH, and retention time to select for nitr i fying bacteria such as Nitrosomonas . ref name PA DEP http www.dep.state.pa.us dep deputate watermgt wsm WSM TAO InnovTech ProjReviews SharonHiRate.htm Pennsylvania Department of Environmental Protection , The SHARON High Rate Nitrogen Removal System ref Denitrification of waste streams utilizing SHARON reactors can proceed with an annoxic reduction, such as anammox . ref name Volke http watermatex2007.org biomath publications download VolckeEveline PhD.pdf Volcke E.I.P. 2006 . Modelling, analysis and control of partial nitritation in a SHARON reactor. PhD thesis, Ghent University, Belgium, pp. 300. ref ref name STOWA http www.stowa selectedtechnologies.nl Sheets Sheets Sharon...Anammox.Process.html STOWA sheets SHARON ANAMMOX Process ref References See Wikipedia Footnotes on how to create references using ref ref tags which will then appear here automatically Reflist External links http www.m2ttech.com index.html M2T Technologies Categories Category Anaerobic digestion Category Articles created via the Article Wizard ... more details
, and carbon to more reduced compounds. Dissimilatory denitrification is the main route by which ... of sulfide minerals sulfidic metal ores . Economic relevance Dissimiltory denitrification is widely ... water can lead to problems due to its toxicity. Denitrification converts both compounds into harmless ... nitrate reduction denitrification facultative aerobes nitrate NO sub 3 sub sup sup nitrite ... more details
Unreferenced stub auto yes date December 2009 Image Axial 2.png thumb left Figure 1 Axial flow pump for industrial use An axial flow pump , or AFP, is a common type of pump that essentially consists of a propeller in a pipe. The propeller can be driven directly by a sealed Electric motor motor in the pipe or mounted to the pipe from the outside or by a right angle drive shaft that pierces the pipe. The main advantage of an AFP is that it can easily be adjusted to run at peak Efficient energy use efficiency at low flow high pressure and high flow low pressure by changing the blade pitch pitch on the propeller some models only . These pumps have the smallest of the dimensions among many of the conventional pumps and are more suited for low heads and higher discharges. Image Axial 1.png thumb left Figure 2 Characteristic curve of an axial flow pump. Red lines show the different performance at varying blade pitch, blue lines the absorbed power. An application example of an AFP would be transfer pumps used for sailing ballast . In Power Plants they are used for pumping water from a reservoir, river, lake or sea for the refrigeration line. In chemical industry, they are used for the circulation of large masses of liquid, such as in evaporator s and crystallizer s. In sewage treatment an AFP is often used for internal mixed liquor recirculation i.e. transferring nitrified mixed liquor from aeration zone to denitrification zone . DEFAULTSORT Axial Flow Pump Category Pumps Fluiddynamics stub nl Schroefpomp pl Pompa mig owa zh de Axialpumpe ja ... more details
transformations. ref name HAMAP The denitrification properties of Paracoccus denitrificans are an important ... to the chemical process called denitrification in which nitrogen is converted to dinitrogen to produce ... under denitrifying conditions. ref name HAMAP Some strains are capable of aerobic denitrification ..., a process known as heterotrophic nitrification . Coupled to denitrification, heterotrophic nitrification ... more details
Taxobox color lightgrey image image width 240px image caption regnum Bacterium Bacteria phylum Proteobacteria classis Gamma Proteobacteria ordo Pseudomonadales familia Pseudomonadaceae genus Pseudomonas species P. denitrificans binomial Pseudomonas denitrificans binomial authority David Hendricks Bergey Bergey , et al. 1961 type strain http www.atcc.org common catalog numSearch numResults.cfm?atccNum 19244 ATCC 19244 br CCEB 525 br http www.iam.u tokyo.ac.jp 81 main.php IAM 12023 br http www.ncimb.com search.php?parent culture NCIMB 1656 br http www.hpa.org.uk nctc searcher.html NCTC 1656 br http nrrl.ncaur.usda.gov cgi bin usda NRRL B 1028 Pseudomonas denitrificans is a Gram negative facultative anaerobic organism facultative anaerobic bacterium that performs denitrification . It was first isolated from garden soil in Vienna , Austria . It synthesizes vitamin B12 vitamin B sub 12 sub ref cite journal author Lago BD, and Demain AL title Alternate requirement for vitamin B sub 12 sub or methionine in mutants of Pseudomonas denitrificans , a vitamin B sub 12 sub producing bacterium journal J Bacteriol volume 99 issue 1 pages 347 9 year 1969 pmid 5802615 pmc 250011 ref . Based on 16S rRNA analysis, P. denitrificans has been placed in the Pseudomonas pertucinogena P. pertucinogena group ref cite journal author Anzai, et al. title Phylogenetic affiliation of the pseudomonads based on 16S rRNA sequence journal Int J Syst Evol Microbiol volume 50 issue 4 pages 1563 89 year 2000, Jul pmid 10939664 last2 Kim first2 H last3 Park first3 JY last4 Wakabayashi first4 H last5 Oyaizu first5 H doi 10.1099 00207713 50 4 1563 ref . References reflist Category Pseudomonadales Proteobacteria stub ... more details
Ferrotitanium is a ferroalloy , an alloy of iron and titanium with between 10 20..45 75 titanium and sometimes a small amount of carbon. It is used in steelmaking as a cleansing agent for iron and steel the titanium is highly reactive with sulfur, carbon, oxygen, and nitrogen, forming insoluble compounds and sequestering them in slag , and is therefore used for deoxidizing , and sometimes for desulfurization and denitrification . In steelmaking the addition of titanium yields metal with finer grain structure. ilmenite 100 600 kg aluminium powder 52 312 kg fe 32 192 kg burnt lime 13 78 kg CHEMICAL ANALYSIS TYPICAL TiO2 79.3 SiO2 2.2 ZrO2 0.25 FeO 1.3 Fe2O3 12.10 EXPECTED VARIATIONS TiO2 75.0 82.0 SiO2 1.0 2.5 ZrO2 0.2 0.3 FeO 1.2 1.5 Fe2O3 9.0 15.0 SIEVE ANALYSIS SIEVE OPENING MICRONS WEIGHT AGE RETAINED 300 Trace 250 1.9 180 25.2 150 34.0 125 13.4 106 21.9 106 3.6 ti 100 kg alu 52 kg lime 12 kg php 2 kg fe 38 n 4 ANALYSIS is ti34,alu 8,c 1,si 3,n 0.03, re 70to80 Ferrotitanium powder can be also used as a fuel in some pyrotechnic composition s. Ferrotitanium can be manufactured by mixing titanium sponge and scrap with iron and melting them together in an induction furnace . Manganese alloyed ferrotitanium is investigated as a material for hydrogen storage . http adsabs.harvard.edu abs 1978aes.....8.3739J External links cite web url http minerals.usgs.gov minerals pubs commodity ferroalloys myb1 2006 feall.pdf title Minerals Yearbook 2006 Ferroalloys publisher United States Geological Survey accessdate 2009 04 24 first John D. last Jorgenson coauthors Corathers, Lisa A. Gambogi, Joseph Kuck, Peter H. Magyar, Michael J. Papp, John F. Shedd, Kim B. http www.sumitomo ti.co.jp titan e ferro.html Sumitomo Titanium Corporation ferrotitaniums QFT 70, QFT 40, QFT 28 http www.femottram.co.uk mottram index.php company profile sheffield F.E. Mottram Group Category Ferroalloys Category Deoxidizers Category Pyrotechnic fuels de Ferrotitan fr ... more details
italic title Taxobox color darkgrey name Pseudovibrio domain Bacteria phylum Proteobacteria classis Alphaproteobacteria ordo Rhodobacterales familia Rhodobacteraceae genus Pseudovibrio subdivision ranks Species biology Species subdivision Pseudovibrio ascidiaceicola Pseudovibrio denitrificans Pseudovibrio japonicus Pseudovibrio olivaceus Pseudovibrio sp. 0703 Pseudovibrio sp. 1603 Pseudovibrio sp. IS0405 Pseudovibrio sp. MKT84 Pseudovibrio sp. MKT94 Pseudovibrio sp. SPO723 Pseudovibrio sp. TJD641 Pseudovibrio sp. TJD659 synonyms Pseudovibrio Shieh et al. 2004 In alpha taxonomy taxonomy , Pseudovibrio is a genus biology genus of the Rhodobacteraceae . ref See the National Center for Biotechnology Information NCBI http www.ncbi.nlm.nih.gov Taxonomy Browser wwwtax.cgi?mode Info&id 258255 webpage on Pseudovibrio . Data extracted from the cite web url ftp ftp.ncbi.nih.gov pub taxonomy title NCBI taxonomy resources publisher National Center for Biotechnology Information accessdate 2007 03 19 ref References reflist 1 Further reading Scientific journals cite journal author Shieh WY, Lin Y T, Jean WD date 2004 title Pesudovibrio denitrificans gen. nov., sp. nov., a marine, facultatively anaerobic, fermentative bacterium capable of denitrification journal Int. J. Syst. Evol. Microbiol. volume 54 pages 2307&ndash 2312 pmid 15545476 doi 10.1099 ijs.0.63107 0 issue Pt 6 Scientific books cite book author Garrity GM, Holt JG date 2001 chapter Taxonomic Outline of the Archaea and Bacteria title Bergey s Manual of Systematic Bacteriology Volume 1 The Archaea and the deeply branching and phototrophic Bacteria edition 2nd editor DR Boone and RW Castenholz, eds. pages p. 155 166 publisher Springer Verlag location New York isbn 978 0387987712 Scientific databases Taxonomic references taxon Pseudovibrio External links Taxonomic links microbe yes NCBI taxID 258255 taxoname Pseudovibrio LSPN letter p LSPN taxoname pseudovibrio proteobacteria stub Category Rhodobacterales Category Bacteria ... more details
McIntosh and Filde s anaerobic jar is an instrument used in the production of an anaerobic environment. This method of anaerorbiosis as others is used to culture bacteria which die or fail to grow in presence of oxygen anaerobes . ref Textbook of Microbiology by Prof. C P Baveja, ISBN 81 7855 266 3 ref ref Textbook of Microbiology by Ananthanarayan and Panikar, ISBN 81 250 2808 0 ref Construction The jar, about 20&Prime 12.5&Prime is made up of a metal. Its parts are as follows The body made up of metal airtight The lid, also metal can be placed in an airtight fashion A screw going through a curved metal strip to secure and hold the lid in place A thermometer to measuring the internal temperature A pressure gauge to measuring the internal pressure or a side tube is attached to a manometer Another side tube for evacuation and introduction of gases to a gas cylinder or a vacuum pump A wire cage hanging from the lid to hold a catalyst that makes hydrogen react to oxygen without the need of any Combustion ignition source Method of use First The culture The culture media are placed in side the jar, stacked up one on the other, and Indicator system Pseudomonas aeruginosa , inoculated on to a nutrient agar plate is kept inside the jar along with the other plates. This bacteria need oxygen to grow Aerobic organism aerobic . A growth free culture plate at the end of the process indicates a successful anaerobiosis. However, P. aeruginosa possesses a denitrification pathway. If nitrate is present in the media, P. aeruginosa may still grow under anaerobic conditions. Second sup 6 sup sub 7 sub sup ths sup of the air inside is pumped out and replaced with either unmixed Hydrogen or as a 10 CO sub 2 sub 90 H sub 2 sub mixture. The catalyst Palladium acts and the oxygen is used up in forming water with the hydrogen. The manometer registers this as a fall in the internal pressure of the jar. Third Hydrogen is pumped in to fill up the jar so that the pressure inside equals atmospher ... more details
Bacterioplankton refers to the bacterium bacterial component of the plankton that drifts in the water column. The name comes from the Ancient Greek word lang grc lang grc Latn planktos , meaning wanderer or drifter Thurman, 1997 , and lang la bacterium , a Latin neologism coined in the 19th century by Christian Gottfried Ehrenberg . They are found in both seawater and freshwater . Bacterioplankton occupy a range of ecological niche s in aquatic systems. Many are saprotroph ic, and obtain energy by consuming organic material produced by other organisms. This material may be Dissolved Organic Carbon dissolved in the medium and taken directly from there, or bacteria may live and grow in association with particulate material such as marine snow . Many other bacterioplankton species are autotroph ic, and derive energy from either photosynthesis or chemosynthesis . The former are often categorised as phytoplankton picophytoplankton , and include cyanobacteria l groups such as Prochlorococcus and Synechococcus . Bacterioplankton also play roles in ecological pathways such as nitrogen fixation , nitrification , denitrification , remineralisation and methanogen esis. Like other small plankton, the bacterioplankton are predation preyed upon by zooplankton usually protozoa ns , and their numbers are also controlled through infection by bacteriophage s. See also Cyanobacteria Pelagibacter Phytoplankton Plankton Zooplankton References cite book last Thurman first H. V. year 1997 title Introductory Oceanography publisher Prentice Hall College location New Jersey, USA isbn 0 13 262072 3 External links http thalassa.cbl.umces.edu MO2006 Typical Marine bacterioplankton http thalassa.cbl.umces.edu MO2006 marbac.html A list of Seawater Bacteria http halia.hik.se mbd start.jsp Marine Bacterioplankton Database plankton Category Biological oceanography Category Planktology Category Aquatic ecology ar de Bakterio und Virioplankton et Bakterioplankton fr Bact rioplan ... more details
. The conventional removal is nitrification, followed by denitrification . The cost of this process ... source e.g., methanol for the denitrification. Nitrification can also occur in drinking water. In distribution ... and Denitrification Probing the Nitrogen Cycle in Aquatic Environments B. B. Ward Microbial ... for the oxidation of ammonia. ref Nitrification and Denitrification Probing the Nitrogen Cycle ... See also f ratio Haber process Nitrogen fixation Simultaneous nitrification denitrification References ... more details
nitrogen from the atmosphere into nitrogen containing organic substances. ref name epa Denitrification ..., a series of processes called denitrification returns an approximately equal amount of nitrogen ... . In excess, denitrification can lead to overall losses of available soil nitrogen and subsequent loss ... before denitrification returns it to the atmosphere. The diagram above illustrates the nitrogen cycle ... more details
Refimprove date March 2007 In fishkeeping , a refugium is an appendage to a marine, brackish, or freshwater fish tank that shares the same water supply. For some applications water flow is limited in order to protect plants or animals that require slow flow. The refugium light cycle can be operated opposite to the main tank, in order to keep total system pH more stable due to the uptake of acid forming CO2 by the refugium during its daylight hours . One size guideline is 1 10 main tank volume. A refugium may be used for one or more purposes such as denitrification, nutrient export, plankton production, circulation, surface agitation, oxygenation or aesthetic purposes. Construction Citations missing section date March 2007 Tropical Marine Refugiums often contain live rock and live sand, macroalgae, and sometimes scavenger microfauna such as micro brittle stars, tiny sea stars such as Asterina starfish asterina , snails, and worms ref name Calfo1 Calfo, A Book of Coral Propagation . Reading Trees Publication, 2009. ISBN 0 9716371 0 5 ref . To achieve maximum biological filtration through uptake of nutrients by macroalgae mangroves, strong lighting is often utilized in the refugium. In this fashion, macroalgae algae growth is encouraged, competing with nuisance algae which would otherwise thrive in the main display tank. Some also use refugiums to raise tiny brine shrimp , mysis shrimp , ostracod s, amphipod s, copepod s and isopod s for delicate fish like seahorse s and dragonet s to feed on ref name Calfo1 . A sump is an additional tank often kept under the display tank that serves to house filtration and other miscellaneous equipment such as protein skimmers, reaction chambers, hoses, heaters and the like. This is especially common for show tanks and reef tanks. In addition to housing critical equipment, the sump serves to add volume to the total system mitigating the effects of nutrient buildup or unintentional introduction of foreign substances. Tropical Freshwate ... more details
rich bottom of a beaver dam. Denitrification Some scientists believe that the nitrate cascade, the production ... date July 2008 but not proven, that beaver dams along a stream may contribute to denitrification the conversion of nitrogen compounds back into nitrogen . In sewage plants, denitrification is achieved ... all the way down the stream and denitrification is a likely result. Salmon Beaver dams are a nursery ... more details
Taxobox image Bradyrhizobium japonicum USDA 110 on TY agar.JPG image caption Bradyrhizobium japonicum strain USDA 110 on an agar plate . regnum Bacteria phylum Proteobacteria classis Alphaproteobacteria ordo Rhizobiales familia Bradyrhizobiaceae genus Bradyrhizobium species B. japonicum binomial Bradyrhizobium japonicum binomial authority Kirchner 1896 in science 1896 Jordan , 1982 in science 1982 synonyms Rhizobium japonicum Buchanan 1926 br Rhizobacterium japonicum Kirchner 1896 ref Transfer of Rhizobium japonicum Buchanan 1980 to Bradyrhizobium gen. nov., a genus of slow growing, root nodule bacteria from leguminous plants. Int. J. Syst. Bacteriol., 1982, 32, 136 139. ref Bradyrhizobium japonicum is a species of legume root nodulating, microsymbiotic nitrogen fixing bacterium species. B. japonicum is identified as a DNA homology group group II ref cite journal author A. B. Hollis, W. E. Kloos & G. E. Elkan year 1981 title DNA DNA hybridization studies of Rhizobium japonicum and related Rhizobiaceae journal Microbiology journal Journal of General Microbiology volume 123 pages 215 222 ref . B. japonicum is able to degrade catechin with formation of phloroglucinol carboxylic acid , further decarboxylated to phloroglucinol , which is dehydroxylated to resorcinol and hydroxyquinol . Citation needed date June 2010 B. japonicum possess the nosRZDFYLX gene, which aides in denitrification and has two catalytic subunits Cu a and Cu z with several histidine residues . It manages an expression cascade that can sense oxygen gradients, termed FixJ FixK2 FixK1. FixJ positively regulates FixK2, which activates nitrogen respiration genes as well as FixK1. FixK1 mutants are unable to respire from nitrogen due to a defective catatylic copper subunit Cu z in nosRZDFYLX. ref cite journal author D. Nellen Anthamatten, P. Rossi, et al. year 1998 title Bradyrhizobium japonicum, FixK2, a Crucial Distributor in the FixLJ Dependent Regulatory Cascade for Control of Genes Inducible by Low O ... more details
Nofootnotes article date May 2011 Bioelectrochemical reactors are a type of bioreactor where bioelectrochemistry bioelectrochemical processes can take place. They are used in bioelectrochemical syntheses, environmental remediation and electrochemical energy conversion. Examples of bioelectrochemical reactors include microbial electrolysis cell s, microbial fuel cell s and enzymatic biofuel cell s and electrolysis cells, microbial electrosynthesis microbial electrosynthesis cell s, and biobattery biobatteries . See also Electromethanogenesis Electrochemical energy conversion Electrofuels Electrochemical engineering Bioelectrochemistry Bioelectronics Electrochemical reduction of carbon dioxide Electrochemical cell Galvanic cell Electrolytic cell External links cite journal pages 47 9 doi 10.1016 j.jbiosc.2010.08.010 title Methanogenic communities on the electrodes of bioelectrochemical reactors without membranes year 2011 last1 Sasaki first1 Kengo last2 Morita first2 Masahiko last3 Sasaki first3 Daisuke last4 Hirano first4 Shin Ichi last5 Matsumoto first5 Norio last6 Ohmura first6 Naoya last7 Igarashi first7 Yasuo journal Journal of Bioscience and Bioengineering volume 111 pmid 20840887 issue 1 cite journal pages 4164 71 doi 10.1016 j.electacta.2009.02.062 title Nitrate remediation in a novel upflow bio electrochemical reactor UBER using palm shell activated carbon as cathode material year 2009 last1 Ghafari first1 Shahin last2 Hasan first2 Masitah last3 Aroua first3 Mohamed Kheireddine journal Electrochimica Acta volume 54 issue 17 cite journal pages 440 9 doi 10.1089 ees.2005.22.440 title Sequential Nitrification and Denitrification in a Divided Cell Attached Growth Bioelectrochemical Reactor year 2005 last1 Goel first1 Ramesh K. last2 Flora first2 Joseph R.V. journal Environmental Engineering Science volume 22 issue 4 cite journal pmid 15566194 year 2004 last1 Watanabe first1 T last2 Jin first2 HW last3 Cho first3 KJ last4 Kuroda first4 M title Application of a bio ... more details
Eg Engs is an artificial lake and wetland site located in the north of the town of rhus between Vejlby , Risskov and Lystrup . It is bordered by the Djursland motorway to the north and the rhus Grenaa railway and the municipal heating pipes from Studstrup Power Station to the south and east. File Egaa Engsoe.jpg thumb Eg Engs with Lisbjerg on the hill behind It was created by re flooding meadows on land previously drained in the 1950s for agricultural use. By the 1990s the water quality and natural ecosystem in and around the Eg river into which the site drained had declined due to the effect of nitrate fertiliser eutrophication use through intensive farming in the area. rhus Municipality , rhus County and the Danish Forest and Nature Agency resolved to construct the lake to reduce this effect through bacterial denitrification. ref http www.energymap.dk Profiles City of Aarhus Cases Wastewater treatment E2 80 93 the natural way ref The lake was created alongside work on the new Djursland motorway, and completed in 2006. File Egaa Engsoe2.jpg thumb left Eg Engs with Skejby on the hill in the background The lake covers approximately 115 hectares, with another 50 hectares of meadow and paths. It is not possible to reach the lake edge in many places, which are reserved for the grazing of cattle which help maintain the natural meadowland. It is approximately a maximum of 1.7m deep.The lake contains a number of fish species, however fishing is prohibited. On the south edge, there is a bird hide, opened in 2007 whose construction was funded by Australian wine firm Banrock Station . The lake attracts many different bird species in high numbers, with 169 species registered up to 2010. A path approximately 5 km long with each km marked runs round the outside of the lake, suitable for walking, running or biking. There are 2 parking places, near the motorway junction from Lystrupvej at the north east corner and from Viengevej in the south east corner. There is a ... more details
ammonia laden water into the environment can cause problems, Simultaneous nitrification denitrification ... of ammonia in the future because of its abundance and the need to Denitrification remove it from ... more details
4 sub small small to nitrate NO sub 3 sub small small and denitrification anaerobic process in which ... of the mineralized N. Because microbial nitrification and denitrification are leaky , N deposition ... importance of Nr accumulation and denitrification , which has been mainly due to a lack of integration ... of progress in denitrification research. Ecological Applications 16 2057 2063 ref Most Nr ... until it is converted to N sub 2 sub , primarily through denitrification . ref name gallo2003 Although terrestrial denitrification produces gaseous intermediates nitric oxide NO and nitrous oxide ... agricultural systems through denitrification . ref http www.springerlink.com content q501k74527643w60 ... on Nr storage and denitrification rates. ref name davseit this is part of the nitrogen cycle References ... more details
Encyclopedia
top
