Taxobox name Purplesulfurbacteria image image width 240px image caption Purplesulfurbacteria regnum Bacteria phylum Proteobacteria classis Gammaproteobacteria ordo Chromatiales subdivision ranks Families subdivision Chromatiaceae br Ectothiorhodospiraceae br Halothiobacillus Halothiobacillaceae The purplesulfurbacteria are a group of Proteobacteria capable of photosynthesis , collectively referred to as purplebacteria . They are Anaerobic organism anaerobic or microaerophilic , and are often found in hot spring s or stagnant water . Unlike Plantae plants , algae , and cyanobacteria , they do not use water as their reducing agent , and so do not produce oxygen . Instead they use hydrogen sulfide , which is oxidized to produce granules of elemental sulfur . This in turn may be oxidized to form sulfuric acid . The purplesulfurbacteria are divided into two families, the Chromatiaceae and Ectothiorhodospiraceae , which respectively produce internal and external sulfur granules, and show differences in the structure of their internal membranes. They make up the order Chromatiales, included ... in the Chromatiales, in its own family, but it is not photosynthetic. Purplesulfurbacteria are generally ... lakes for the development of purplesulfurbacteria are meromictic permanently stratified lakes ... purplesulfurbacteria can form dense cell masses, called blooms, usually in association with green phototrophic bacteria. See also Sulfur reducing bacteria Green Lake New York Anoxic event Anoxygenic ... accumulates and also in sulfur springs where geochemically or biologically produced hydrogen sulfide can trigger the formation of blooms of purplesulfurbacteria. Anoxic conditions are required for photosynthesis these bacteria cannot thrive in oxygenated environments. ref Proctor, Lita M. 1997 . http www.int res.com articles ame 12 a012p105.pdf Nitrogen fixing, photosynthetic, anaerobic bacteria ... del sofre de Chromatiales es Bacteria p rpura del azufre fr Bact rie pourpre sulfureuse it Chromatiales ... more details
e.g. Rhodoferax Purplesulfurbacteria are included among the Gammaproteobacteria gamma subgroup , and make up the order purplesulfurbacteria Chromatiales . The similarity between the photosynthetic ...Purplebacteria or purple photosynthetic bacteria are proteobacteria that are phototroph ic, that is capable ..., tubes, or sheets, increasing the available surface area. Like most other photosynthetic bacteria, purplebacteria do not produce oxygen , because the reducing agent electron donor involved in photosynthesis is not water. In some, called purplesulfurbacteria , it is either sulfide or elemental sulfur . The others, called purple non sulfurbacteria aka PNSB , typically use hydrogen although some ... show the purplebacteria make up a variety of separate groups, each closer relatives of non photosynthetic proteobacteria than one another. History Purplebacteria were the first bacteria discovered to photosynthesize without having an oxygen byproduct. Instead, their byproduct is sulfur. This was proved by first establishing the bacteria s reactions to different concentrations of oxygen. What was found was that the bacteria moved quickly away from even the slightest trace of oxygen. Then a dish of the bacteria was taken, and a light was focused on one part of the dish leaving the rest dark. As the bacteria cannot survive without light, all the bacteria moved into the circle of light, becoming very crowded. If the bacteria s byproduct was oxygen, the distances between individuals would become larger and larger as more oxygen was produced. But because of the bacteria s behavior in the focused light, it was concluded that the bacteria s photosynthetic byproduct could not be oxygen. Taxonomy Purple non sulfurbacteria are found among the Alphaproteobacteria alpha and Betaproteobacteria ... s. These give them colours ranging between purple, red, brown, and orange. Metabolism Photosynthesis ... bacteria Category Microbiology ca Bacteri porpra cs Purpurov bakterie de Purpurbakterien et Purpurbakterid ... more details
event Purplesulfurbacteria Notes, links and References External links cite web title The Family ...Taxobox name Green sulfurbacteria image Green d winogradsky.jpg image caption Green sulfurbacteria in a Winogradsky column colour lightgrey domain Bacteria phylum Chlorobi classis Chlorobia ordo Chlorobiales familia Chlorobiaceae subdivision ranks Genera subdivision Chlorobium Chloroherpeton Clathrochloris Pelodictyon Prosthecochloris The green sulfurbacteria are a family biology family of obligately anaerobic organism anaerobic photoautotrophic bacteria . Most closely related to the distant Bacteroidetes , they are accordingly assigned their own phylum . ref name bryantfrigaard cite journal author D.A. Bryant & N. U. Frigaard month November year 2006 title Prokaryotic photosynthesis and phototrophy illuminated journal Trends Microbiol. volume 14 issue 11 pages 488 doi 10.1016 j.tim.2006.09.001 pmid 16997562 ref Green sulfurbacteria are non motile except Chloroherpeton thalassium , which may bacterial gliding glide ref name bryantfrigaard and come in spheres, rods, and spirals. Citation needed date August 2007 Photosynthesis is achieved using bacteriochlorophyll BChl c , d , or e , in addition to BChl a and chlorophyll a chlorophyll a , ref name bryantfrigaard in chlorosome s attached to the membrane. Citation needed date August 2007 They use sulfide ions, hydrogen or ferrous iron as an electron donor and the process is mediated by the type I reaction centre and Fenna Matthews Olson complex . Elemental sulfur deposited outside the cell may be further oxidized. By contrast ... A species of green sulfurbacteria has been found living near a black smoker off the coast of Mexico ... 9306 10 pmid 15967984 doi 10.1073 pnas.0503674102 pmc 1166624 ref Green sulfurbacteria appear in Lake .... For example The green sulfurbacteria are a family of obligately anaerobic photoautotrophic bacteria ..., 9 July 2008 UTC Bacteria classification DEFAULTSORT Green SulfurBacteria Category Phototrophic bacteria ... more details
Sulfur reducing bacteria SRB get their energy by redox reaction reducing elemental sulfur to hydrogen sulfide . They couple this reaction with the oxidation of acetate , succinate or other organic compounds . Several types of bacteria and many non methanogen ic archaea can reduce sulfur. Some bacteria ndash such as Proteus bacterium Proteus , Campylobacter , Pseudomonas and Salmonella ndash have the ability to reduce sulfur, but can also use oxygen and other terminal electron acceptors. Others, such as Desulfuromonas , use only sulfur. These bacteria can be used in industrial processes to generate hydrogen sulfide for the precipitation of metals. Some bacteria can use both elemental sulfur and sulfate as electron acceptors. See sulfate reducing bacteria . References cite book last1 Brock first1 Thomas D. authorlink1 Thomas D. Brock last2 Madigan first2 Michael T. last3 Martinko first3 John M. last4 Parker first4 Jack title Biology of Microorganisms publisher Prentice Hall date 1994 location New Jersey pages 749 752 isbn 1 4058 5345 X bacteria stub Category Phototrophic bacteria Category Hydrogen biology Category Microbiology cs Sirn bakterie de Schwefeloxidierende Bakterien es Bacteria reductora de azufre fi Rikkibakteerit uk ... more details
, green sulfurbacteria and some purplebacteria , but also many chemolithotrophic species, such as nitrifying or sulfur oxidising bacteria. ref cite journal author Hellingwerf K, Crielaard W, Hoff ... structures called chlorosome s in green sulfurbacteria . ref cite journal author Psenc k J, Ikonen ... compounds photoheterotrophs or carbon fixation photoautotrophs Cyanobacteria , Green sulfurbacteria , Chloroflexi , or Purplebacteria Lithotroph s align center Inorganic compounds ... article Taxobox color lightgrey name Bacteria fossil range Archean or earlier Recent image EscherichiaColi ... bacilli domain Bacteria subdivision ranks Phyla ref cite web url http www.ncbi.nlm.nih.gov Taxonomy Browser wwwtax.cgi?mode Undef&id 2&lvl 3&lin f&keep 1&srchmode 1&unlock title Bacteria eubacteria accessdate ... br Dictyoglomi br Thermodesulfobacteria br Thermotogae Bacteria IPA en b k t ri en ... s. Typically a few micrometre s in length, bacteria have a wide range of shapes, ranging from sphere s to rods and spirals. Bacteria are ubiquitous in every habitat on Earth , growing in soil ... Names of large numbers The standard dictionary numbers nonillion 5 10 sup 30 sup bacteria on Earth ... Hogan. 2010. http www.eoearth.org article Bacteria?topic 49480 Bacteria . Encyclopedia of Earth ... DC ref Bacteria are vital in recycling nutrients, with many steps in nutrient cycle s depending on these organisms ... and putrefaction . However, most bacteria have not been characterised, and only about half of the phylum phyla of bacteria have species that can be microbiological culture grown in the laboratory ... annurev.micro.57.030502.090759 ref The study of bacteria is known as bacteriology , a branch of microbiology ... cells in the body, with large numbers of bacteria on the skin and as gut flora . ref cite journal ... of the bacteria in the body are rendered harmless by the protective effects of the immune system , and a few are probiotic beneficial . However, a few species of bacteria are pathogenic bacteria pathogenic ... more details
green and purplesulfurbacteria and some chemolithotroph s use elemental oxygen to carry out ... Main Sulfur cycle Sulfur may also serve as energy chemical food source for bacterium bacteria ... of hydrogen sulfide as food to be oxidized. The so called sulfurbacteria , by contrast, breathe sulfate ...About the chemical element pp move indef Infobox sulfurSulfur or sulphur IPAc en icon s l f r respell ... conditions for temperature and pressure normal conditions , sulfur atoms form cyclic octatomic molecules with chemical formula S sub 8 sub . Elemental sulfur is a bright yellow crystal line solid. Chemically, sulfur can react as either an oxidant or reducing agent . It oxidizes most metal s and several ... s, but it reduces several strong oxidants, such as oxygen and fluorine . In nature , sulfur can be found as the pure element and as sulfide and sulfate minerals. Elemental sulfur crystals are commonly ... in native form, sulfur was known in ancient times, mentioned for its uses in ancient Greece , ancient China China and ancient Egypt Egypt . Sulfur fumes were used as fumigants, and sulfur containing medicinal mixtures were used as balms and antiparasitics. Sulfur is referenced in the Bible as brimstone , with this name still used in several nonscientific terms. ref name Greenwd Sulfur was considered ... the scientific community that sulfur was a basic element, rather than a compound. Elemental sulfur was once ... been obsolete since the late 20th century. Today, almost all elemental sulfur is produced as a byproduct of removing sulfur containing contaminants from natural gas and petroleum . The element s commercial ... for the element are in match es, insecticide s and fungicide s. Many sulfur compounds are odiferous, and the smell of odorized natural gas, skunk scent, grapefruit, and garlic is due to sulfur compounds ... biological processes. Sulfur is an essential element for all life, and is widely used in biochemical processes. In metabolic reactions, sulfur compounds serve as both fuels and respiratory oxygen ... more details
distinguish Coliiformes File E coli at 10000x, original.jpg thumb Escherichia coli Coliform bacteria are a commonly used bacteria l indicator of sanitary quality of foods and water. They are defined as rod shaped Gram negative non endospore spore forming bacteria which can ferment lactose with the production of acid and gas when incubated at 35 37 C. ref American Public Health Association APHA , Standard Methods for the Examination of Water and Wastewater 19th ed. , APHA, Washington, DC 1995 . ref Coliforms are abundant in the faeces of warm blooded animals, but can also be found in the aquatic environment, in soil and on vegetation. While coliforms are themselves not normally causes of serious illness, they are easy to culture and their presence is used to indicate that other pathogenic organisms of faecal origin may be present. Faecal pathogens include bacteria, viruses, or protozoa and many multicellular parasites. Typical genera include ref The Microbiology of Drinking Water 2002 Part 1 Water Quality and Public Health Department of the Environment ref Citrobacter , Enterobacter Escherichia Hafnia bacterium Hafnia Klebsiella Serratia Escherichia coli E. coli , a rod shaped member of the coliform group, can be distinguished from most other coliforms by its ability to ferment lactose at 44 C in the fecal coliform test, and by its growth and color reaction on certain types of culture media. When cultured on an EMB plate, a positive result for E. coli is metallic green colonies on a dark purple media. Unlike the general coliform group, E. coli are almost exclusively of fecal origin and their presence is thus an effective confirmation of fecal contamination. See also Bacteriological water analysis Coliform Index Fecal coliforms Indicator bacteria References Reflist Category Bacteria Category Foodborne illnesses Category Water quality indicators Category Microbiology bacteria stub cs Koliformn bakterie de Coliforme Bakterien id Bakteri koliform it Coliformi he ... more details
dwelling sulfurbacteria Thioploca spp. in overcoming diffusion limitations journal Appl ...Magnetotactic bacteria or MTB are a polyphyletic group of bacteria discovered in the 1960s, that orient along the magnetic field magnetic field lines of Earth s magnetic field . To perform this task, these bacteria ... taxis involves a stimulus response mechanism . In contrast to the magnetoception of animals, the bacteria contain fixed magnets that force the bacteria into alignment even dead cells align, just like ... The first description of magnetotactic bacteria appeared in 1963 in a publication of the Microbiology ... Universita di Pavia. ref While observing bog sediments under his microscope, he noticed a group of bacteria ... according to the direction of the North Pole , and hence called them magnetosensitive bacteria . The first peer reviewed article on magnetotactic bacteria appeared in a 1975 article in Science by Richard ... had similarly observed bacteria capable of orienting themselves in a certain direction Blakemore realised ... Blakemore, Richard title Magnetotactic Bacteria year 1975 journal Science volume 190 pages 377 379 pmid 170679 issue 4212 ref These bacteria have been the subject of many experiments they have even ... of magnetotactic bacteria to the Earth s magnetic field arises from the fact these bacteria ... bacteria are reported to precipitate either magnetite or greigite . These crystals, and sometimes ... of fossil magnetotactic bacteria journal Earth Science Reviews year 2007 doi 10.1016 j.earscirev.2007.08.001 ... lodestones.shtml Living Lodestones Magnetotactic bacteria , Strange Horizons, 2001 ref Biology Several ... Magnetite producing magnetotactic bacteria are usually found in an Anoxic waters oxic anoxic transition ... of magnetotactic bacteria can produce magnetite even in Hypoxia environmental anaerobic conditions, using ... title Controlled biomineralization of magnetic minerals by magnetotactic bacteria year 1995 journal ... from that found in magnetotactic bacteria has been also found in higher organisms, from Euglenoid ... more details
wiktionarypar bacteria The bacteria are a major group of Prokaryote prokaryotic living organisms. Bacteria may also refer to Bacteria malware or Rabbit Programs, a type of malicious software Bacteria, a fictional country in The Great Dictator Bacteriidae , a family of South American stick insect s disambig ... more details
Unreferenced date September 2008 Phototrophic bacteria or photolithotrophic bacteria are lithotrophic bacteria that use photosynthesis as their source of energy. Gallery gallery Image Chlorofl.jpg Chloroflexus aurantiacus Image Halobacteria.jpg Cluster cells of Halobacterium gallery Photolithotrophic bacteria Category Phototrophic bacteria ja ... more details
unreferenced date July 2010 Atypical bacteria are bacteria which remain colourless after gram staining . See also Gram negative bacteria Category Bacteriology microbiology stub ... more details
Unreferenced date March 2007 Putrefying bacteria is the term used to describe bacteria involved in putrefaction of living matter. Putrefying bacteria turn nitrogen proteins into ammonium compounds. Nitrifying bacteria turn the ammonium compounds into nitrates. See also Decomposition Anaerobic organism DEFAULTSORT Putrefying Bacteria Category Alchemical processes Category Microbiology bacteria stub ... more details
Unreferenced stub auto yes date December 2009 Symbiotic bacteria are bacteria living in symbiosis with another organism or each other. For example, Zoamastogopera , found in the stomach of termites, enable them to digest cellulose . Some types of cyanobacteria are endosymbiont to types of lichens and sponges. Symbiotic bacteria are able to live in or on plant or animal tissue biology tissue . In digestive systems, symbiotic bacteria help break down foods that contain fibre . They also help produce vitamins . br Symbiotic bacteria can live near hydrothermal vents. They usually have a mutual relationship with other bacteria. Some live in giant tube worm tube worm s. A use for symbiotic bacteria has recently been in paratransgenesis for controlling important vectors for disease, such as the transmission of Chagas disease by Triatoma Triatome kissing bug s. br DEFAULTSORT Symbiotic Bacteria Category Symbiosis Category Bacteriology Category Microbiology Bacteria stub Ecology stub fr Bact rie symbiotique ... more details
unreferenced date June 2008 Siderophilic bacteria are bacteria that require or are facilitated by free iron . They may include Vibrio vulnificus , Listeria monocytogenes , Yersinia enterocolica , Salmonella enterica serotype Typhymurium , Klebsiella pneumoniae and Escherichia coli . One possible symptom of haemochromatosis is susceptibility to infections from these species. Certain non bacterial microorganisms such as Rhizopus arrhizus and Mucor may also be siderophilic. See also Iron bacteria Iron in microbiology Category Bacteria Category Microbiology bacteria stub fi Siderofiilit ... more details
Unreferenced date March 2007 Knallgas bacteria is a name sometimes used for bacteria which oxidize hydrogen . See microbial metabolism Microbial metabolism Hydrogen oxidation hydrogen oxidation . These bacteria include Hydrogenobacter thermophilus , Hydrogenovibrio marinus , and Helicobacter pylori . There are both Gram positive and negative knallgas bacteria. Most grow best under microaerophilic conditions. They do this because the hydrogenase enzyme used in hydrogen oxidation is inhibited by the presence of oxygen, but oxygen is still needed as a terminal electron acceptor . The word Knallgas is Swedish language Swedish and German language German for bang gas and means a mixture of hydrogen and oxygen see oxyhydrogen . DEFAULTSORT Knallgas Bacteria Category Bacteria Category Microbiology bacteria stub cs Vod kov bakterie ru ... more details
Thermoduric bacteria are bacteria which can survive, to varying extents, the pasteurisation process. ref name indo cite news url http www.independent.ie farming dairy the heatresisting bacteria 1388056.html title The heat resisting bacteria last Donworth first John date 2008 05 27 work Irish Independent publisher Independent News and Media accessdate 2009 08 11 ref Species of bacteria which are thermoduric include Bacillus , Clostridium and Enterococci . ref name glan cite web url https agrilink.ie MilkNews2007 4241 20Thermoduric 20Bacteria.pdf last Murphy first Pat title Control of Thermoduric Bacteria in Raw Milk Supplies publisher Glanbia accessdate 2009 08 11 ref References Reflist bacteria stub Category Food science ... more details
Psychrotrophic bacteria are bacteria that are capable of surviving or even thriving in a cold environment. They can be found in soils ref cite web url http www3.interscience.wiley.com journal 120081154 abstract?CRETRY 1&SRETRY 0 title An Ecological Study of the Psychrotrophic Bacteria of Soil, Water, Grass and Hay Druce 2008 Journal of Applied Microbiology Wiley Online Library publisher .interscience.wiley.com date accessdate 2010 09 01 ref , in surface and deep sea waters ref cite web url http www.springerlink.com content 0kcy3gl47cftrj0w title Marine Biotechnology, Volume 3, Number 5 publisher SpringerLink date accessdate 2010 09 01 ref , and in foods ref cite web url http www.encyclopedia.com doc 1G1 14605181.html title Psychrotrophic Bacteria in Foods Disease and Spoilage. Food Trade Review publisher Encyclopedia.com date 1993 09 01 accessdate 2010 09 01 ref . Psychrotrophic bacteria are of particular concern to the dairy industry ref cite web url http www.leonthemilkman.com 2006 03 18 the case of psychrotrophic bacteria title Leon the Milkman s Blog The case of Psychrotrophic bacteria publisher Leonthemilkman.com date 2006 03 18 accessdate 2010 09 01 ref . Most are killed by pasteurization however, they can be present in milk as post pasteurization contaminants due to less than adequate sanitation practices. According to The Food Science Department at Cornell university Cornell University , psychrotrophs are bacteria capable of growth at temperatures at or less than 7 C 44.6 F . At freezing temperatures, growth of pyschrotrophic bacteria becomes negligible or virtually stops. ref http 74.125.93.132 search?q cache 7i8krEBo1GgJ foodscience.cornell.edu cals foodsci extension upload Bact Milk Shelf Life Doc.doc 22Psychrotrophic bacteria 22&cd 2&hl en&ct clnk&gl us&client ..., Cornell University. . Retrieved 22 November 2009. ref Psychrotrophic bacteria also fall under the more general category of psychrophiles . Notes reflist Category Bacteriabacteria stub fr Psychrotrophe ... more details
Exogenous bacteria are bacteria introduced to closed biological systems from the external world. They exist in water, earth, and the air. Examples are cholera , Legionella , salmonella , rickettsia , mycobacterium , and bacillus anthracis. Endogenous bacteria are part of our normal internal flora . Sources div class references small Lowy, Microbiology and Infectious Diseases Lecture I Bacterial Classification, Structure and Function, Part I August 31, 2004, Transcribed by Anjail Shar. http healthsciences.columbia.edu dept ps 2007 mid mid01.pdf references div Category Microbial growth and nutrition Category Bacteriology Category Microbiology bacteria stub ... more details
Lipophilic bacteria fat liking bacteria are bacteria that may proliferate in lipids . Types They include lipophilic corynebacteria . ref name cmr http cmr.asm.org cgi reprint 10 1 125.pdf Clinical Microbiology of Coryneform Bacteria GUIDO FUNKE,1 ALEXANDER VON GRAEVENITZ,1 JILL E. CLARRIDGE III,2 AND KATHRYN A. BERNARD3 Department of Medical Microbiology, University of Zu rich, Zu rich, Switzerland1 Laboratory Service, Veterans Affairs Medical Center, Departments of Pathology, Microbiology, and Immunology, Baylor College of Medicine, Houston, Texas2 and Special Bacteriology Laboratory, Laboratory Centre for Disease Control, Ottawa, Ontario, Canada3 ref . Propionibacterium acnes is a type of liphophilic bacteria ref http www.muzisyenlerkulubu.com acnetreatments.asp Natural Acne Treatments Guide How to get rid of pimples ref , releasing fatty acids and worsening comedone s. However, the group of lipophilic bacteria are not pathogenic, i.e. they don t cause food poisoning or food infection ref name jensen http www.springerlink.com content 2203u0385q2n1v5r fulltext.pdf The Action of Microorganisms on Fats By L. B. JENSEN and D. P. GRETTIE Swift & Company Laboratories, Chicago, Ill. Published 1933, so feel free to replace ref Health risks Most materials in laboratories and health care centers have small amounts of lipids on their surface, and thus may support the proliferation of lipophilic bacteria. ref http linkinghub.elsevier.com retrieve pii S0886335004006741 Postoperative endophthalmitis. Journal of Cataract & Refractive Surgery, Volume 30, Issue 11, Pages 2441 2444 C. Ferrer ... name jensen , this is not a serous threat. Lipophilic bacteria may also proliferate in diet fat. However ... of the fat ref name jensen Commercial Use Many liopohilic bacteria are a good source of Biosurfactants, hence are used commercially, e.g. Bacillus lichenoformis . These kind of bacteria produce Biosurfactant ... ones. References reflist Extremophile Category Bacteria Category Microbiology medicine stub ... more details
Unreferenced date July 2009 Indicator bacteria are certain species of bacteria used by health authorities to detect contaminated water. Each gram of human feces contains approximately 12 billion val 1.2 e 9 bacteria, among them may include pathogenic bacteria, such as Salmonella , associated with gastroenteritis . In addition, feces may contain pathogenic virus es, protozoa and parasitism parasites . If ingested, these organisms would cause disease. When testing drinking water for contamination, the variety and often low concentrations of pathogens makes them difficult to test for individually. Health authorities therefore use the presence of other more abundant and more easily detected fecal bacteria as indicators of the presence of fecal contamination. Indicator bacteria are not themselves dangerous to the health but are used to indicate the presence of a health risk. The most popularized known indicator bacteria are fecal coliforms , which are found in the intestinal tracts of warm blooded animals. Another less commonly used group of indicator organisms are Sulfate reducing bacteria hydrogen sulfide producing bacteria , which are also found in humans as well as the intestinal tracts of birds and reptiles known carriers of Salmonella. World Health Organization Guidelines for Drinking Water Quality state that as an indicator organism Escherichia coli provides conclusive evidence of recent fecal water pollution pollution and should not be present in water meant for human consumption. It is generally assumed that higher the number of coliform organisms found in a 100ml sample, the higher the risk for waterborne disease. DEFAULTSORT Indicator Bacteria Category Bacteriology Category Microbiology Category Water pollution Category Water quality indicators ... 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 nitrase 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 aerobes prefers to use oxygen as their terminal electron acceptors , however, they could also utilize nitrate instead. Therefore, denitrification can only be synthethised under anaerobic circumstances. This is the main reason why denitrification mostly occurs in the deep substrata of the soil , or in areas of stagnant water . This process of denitrification lowers the fertility of the soil and thus is less common in areas where the land is rather well Cultivation 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 dissimilative nitrate reduction dissimilation , which ... converted back to gaseous nitrogen as opposed to that of nitrifying bacteria 2NO sub 3 sub sup sup 10e ... consisting of two atoms and six molecules of water. Denitrifying bacteria themselves include several ... is roughly balanced by that which is released into the soil by nitrifying bacteria, forming the relatively reliable cycle. Denitrifying bacteria A Group of bacteria that reduce nitrates ... Nitrogen to cycle see Nitrogen cycle back into the atmosphere . These bacteria have also been implicated in depletion of soil fertility, and thereby agricultural productivity See also Nitrifying bacteria Nitrogen cycle Category Bacteria Category Nitrogen metabolism Category Soil biology Category Microbiology ... more details
Refimprove date September 2007 Image Iron bacteria in runoff.JPG thumb right 250px Iron bacteria in surface water In the management of water supply water supply water well well s, iron bacteria are bacteria ... with iron bacteria. Iron bacteria are a natural part of the environment in most parts of the world ... colored deposits. In the process, the bacteria produce a brown slime that builds up on well screens, pipes, and plumbing fixtures. Bacteria known to feed on iron are Thiobacillus ferrooxidans and Leptospirillum ferrooxidans . Habitat Iron bacteria colonize the transition zone where de oxygenated water ... the de oxygenated water reaches a source of oxygen, iron bacteria use that oxygen to convert the soluble ... is often the underlying cause of an iron bacteria population. Groundwater may be naturally de ... 1979 isbn 0 07 035447 2 p.544 ref Other conditions associated with iron bacteria result from the anaerobic aqueous environment rather than the iron bacteria visibly colonizing that habitat. Corrosion ... which indicate that iron bacteria may be present in well water Iron bacteria often produce unpleasant ... bacteria will usually cause yellow, orange, red, or brown stains and colored water It is sometimes possible to see a rainbow colored, oil like sheen on the water. Iron bacteria produce a sticky slime ... growth may also be seen, particularly in standing water such as a toilet tank. Image Iron bacteria burn.JPG right thumb A burn in Scotland with Iron bacteria. The dramatic effects of iron bacteria are seen ... the water. More serious problems occur when bacteria build up in well systems. Iron bacteria in wells ... Iron bacteria can be introduced into a well or water system during drilling, repair, or service. Elimination of iron bacteria once a well is heavily infested can be extremely difficult. Normal treatment techniques may be only partly effective. Good housekeeping practices can prevent iron bacteria ... Iron Bacteria in Well Water ref Water placed in a well for drilling, repair, or priming of pumps should ... more details
Luminescent bacteria emit light as the result of a chemical reaction during which chemical energy is converted to light energy. Luminescent bacteria exist as symbiotic organisms carried within a larger organism, such as many deep sea organisms, including the Lantern Fish , the Angler fish , certain jellyfish , certain clam s and the Gulper eel . The light is generated by an enzyme catalyzed chemoluminescence reaction, wherein the pigment luciferin is oxidisation oxidised by the enzyme luciferase . The expression of gene s related to bioluminescence is controlled by an operon called the lux operon . Some species of luminescent bacteria possess quorum sensing, the ability to determine local population by the concentration of chemical messengers. Species which have quorum sensing can turn on and off certain chemical pathways, commonly luminescence in this way, once population levels reach a certain point the bacteria switch off light production. ref name Meighen 1999 cite journal author Meighen E title Autoinduction of light emission in different species of bioluminescent bacteria journal Luminescence volume 14 issue 1 pages 3 9 year 1999 pmid 10398554 doi 10.1002 SICI 1522 7243 199901 02 14 1 3 AID BIO507 3.0.CO 2 4 ref Characteristics of the phenomenon Bioluminescence is a form of luminescence , or cold light light emission emission less than 20 of the light generates thermal radiation . It should not be confused with fluorescence , phosphorescence or refraction of light. Most forms of bioluminescence are lighter or only exist at night, following a circadian rhythm . See also Dinoflagellate s Vibrionaceae e.g. Vibrio fischeri , Vibrio harveyi , Photobacterium phosphoreum Vibrio phosphoreum References references External links http www.science.siu.edu microbiology micr460 ... bakterie sw index en.html Luminescent Bacteria http siobiolum.ucsd.edu Biolum intro.html Scripps Institution of Oceanography Bioluminescence Category Bacteria Category Bioluminescent organisms ... more details
Nitrifying bacteria are chemotroph chemoautotrophic or chemolithotrophs depending on the genera Nitrosomonas , Nitrosococcus , Nitrobacter , Nitrococcus bacteria that grow by consuming inorganic nitrogen compounds. ref name pmid11539154 cite journal author Mancinelli RL title The nature of nitrogen an overview journal Life support & biosphere science international journal of earth space volume 3 issue 1 2 pages 17 24 year 1996 pmid 11539154 ref Many species of nitrifying bacteria have complex internal membrane systems that are the location for key enzymes in nitrification ammonia monooxygenase which oxidizes ammonia to hydroxylamine , and nitrite oxidoreductase , which oxidizes nitrite to nitrate. Ecology Nitrifying bacteria are widespread in soil and water, and are found in highest numbers where considerable amounts of ammonia are present areas with extensive protein decomposition, and sewage treatment plants . ref name pmid386925 cite journal author Belser LW title Population ecology of nitrifying bacteria journal Annu. Rev. Microbiol. volume 33 issue pages 309 33 year 1979 pmid 386925 doi 10.1146 annurev.mi.33.100179.001521 ref Nitrifying bacteria thrive in lakes and streams with high inputs of sewage and wastewater because of the high ammonia content. Oxidation of ammonia to nitrate Nitrification in nature is the result of actions of two groups of organisms, the nitrosifyers ammonia oxidizing bacteria and nitrifying bacteria nitrite oxidizing, nitrate producing bacteria ref ... 2 pages 25 9 year 1996 pmid 11539155 doi ref Nitrosifying bacteria br NH sub 3 sub O sub 2 sub 2H sup ... sup 1.2 br NH sub 3 sub O sub 2 sub no2 3H sup sup 2e sup &minus sup 1 Nitrifying bacteria br no2 h2o no3 2H sup sup 2e sup &minus sup 2 border 1 align center style text align center Nitrifying bacteria ... 54 Soil border 1 align center style text align center Nitrifying bacteria that oxidize nitrite Standard ... 50 Marine, Soil See also Root nodule Denitrification Denitrifying bacteria f ratio Nitrification ... more details
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