merge to Sigma factor date January 2012 The sigma subunit of the Escherichia coli RNA polymerase holoenzyme is the specificityfactor that mediates the promoter biology promoter recognition and binding subunit of molecular weight 70 Dalton unit kDa . Under some conditions, some of the 70 kDa subunits are replaced by one of the other, more specific factors. For instance, when bacteria are subjected to heat stress, some of the 70 kDa subunits are replaced by a 32 kDa subunit when bound to 32, RNA polymerase is directed to a specialized set of promoters with a different consensus sequence. Category Transcription factors Category DNA ... more details
Cleavage and polyadenylation specificityfactor CPSF or Cleavage polyadenylation stimulating factor is involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA pre mRNA molecule in the process of transcription genetics gene transcription . It is the first protein to bind to the signaling region near the cleavage site of the pre mRNA, to which the polyadenylation polyadenine tail will be added by polyadenine polymerase . The upstream signaling region has the canonical nucleotide sequence AAUAAA, which is highly conserved across the vast majority of pre mRNAs. A second downstream signaling region, located on the portion of the pre mRNA that is cleaved before polyadenylation, consists of a GU rich region required for efficient processing. CPSF is a protein complex consisting of four proteins CPSF 73 , CPSF 100 , CPSF 30 and CPSF 160 . CPSF 73 is believed to be the endonuclease which cleaves mRNA precursor and the crystal structure of its N terminal domain has been resolved. CPSF recruits additional proteins to the 3 region. Identified proteins that are coordinated by CPSF activity include cleavage stimulatory factor and the two poorly understood cleavage factor s. The binding of the polyadenine polymerase responsible for actually synthesizing the tail is a necessary prerequisite for cleavage, thus ensuring that cleavage and polyadenylation are tightly coupled processes. Genes CPSF1 , CPSF2 , CPSF3 , CPSF4 , CPSF6 References Lodish H, Berk A, Matsudaira P, Kaiser CA, Krieger M, Scott MP, Zipursky SL, Darnell J. 2004 . Molecular Cell Biology. WH Freeman New York, NY. 5th ed. Murthy KG, Manley JL. 1995 . The 160 kD subunit of human cleavage polyadenylation specificityfactor coordinates pre mRNA 3 end formation. Gene Dev 9 2672 2683. External links MeshName Cleavage And Polyadenylation SpecificityFactor protein stub RNA binding proteins Post transcriptional modification Category Proteins Category Gene expression ... more details
wiktionarypar specificitySpecificity may refer to Being specific disambiguation Specificity statistics , the proportion of negatives in a binary classification test which are correctly identified Definiteness , in linguistics, whether the referent of a noun phrase in a given context is identifiable Particular , as opposed to abstract, in philosophy Asset specificity , the extent to which the investments made to support a particular transaction have a higher value to that transaction than they would have if they were redeployed for any other purpose Domain specificity , theory that many aspects of cognition are supported by specialized, presumably evolutionarily specified, learning devices See also Species disambiguation Specification disambiguation Specialty disambiguation Site specific disambiguation Language for specific purposes disambig es Especificidad sk pecifickos ... more details
Unreferenced date December 2009 Chemical specificity is the ability of a protein s binding site to bind specific ligand biochemistry ligand s. The fewer ligands a protein can bind, the greater its specificity. DEFAULTSORT Chemical Specificity Category Chemical bonding Category Proteins Biochem stub ... more details
Unreferenced date February 2007 Orphan date February 2009 The specificity constant math k cat K m math is a measure of how efficiently an enzyme converts a Substrate biochemistry Substrate into Product chemistry Product . See Enzyme kinetics Michaelis Menten kinetics . DEFAULTSORT Specificity Constant Category Enzyme kinetics biochem stub ... more details
Medium specificity is a consideration in aesthetics and art criticism . It is most closely associated with modernism , but it predates it. ref http csmt.uchicago.edu glossary2004 specificity.htm ref According to Clement Greenberg , who helped popularize the term, medium specificity holds that the unique and proper area of competence for a form of art corresponds with the ability of an artist to manipulate those features that are unique to the nature of a particular medium. ref cite web url http www.sharecom.ca greenberg modernism.html title Modernist Painting author Clement Greenberg archiveurl http web.archive.org web 20060105194921 http www.sharecom.ca greenberg modernism.html archivedate 2006 01 05 ref For example, in painting, literal flatness and Abstract art abstraction are emphasised rather than illusionism and figuration . ref Vanessa R. Schwartz, Jeannene M. Przyblyski, The Nineteenth Century Visual Culture Reader , Routledge, 2004, p8. ISBN 0415308666 ref Medium specific can be seen to mean that the artwork is constituted by the characteristic qualities of the raw material. This would probably include the techniques used to manipulate the materials. Medium specificity is based on the distinct materiality of artistic media. As early as 1776 Gotthold Ephraim Lessing contends that an artwork, in order to be successful, needs to adhere to the specific stylistic properties ... 2006 03 13 ref As discussed by critic Marshall Soules, medium specificity and media specific analysis ... soules animate.htm archivedate 2006 02 24 ref Medium specificity suggests that a work of art ... dialogue in the post modern period has tended to steer away from medium specificity as a particularly ... Specificity ref References references See also Classificatory disputes about art Form follows function ... specificity.htm Medium Specificity http csmt.uchicago.edu glossary2004 specificity.htm University of Chicago Theories of Media Glossary medium specificity Category Concepts in aesthetics Category ... more details
Asset specificity is a term related to the inter party relationships of a transaction. It is usually ... specificity has been extensively studied in a variety of management and economics areas such as marketing ... of asset specificity is closely related to that of opportunism . Classical economists assume the existence ... and the propensity to act opportunistically. Asset specificity becomes an issue because of opportunism. Definition Asset specificity is usually defined as the extent to which the investments made ... know how and skills. Basically, asset specificity refers to the extent to which a party ... is high with the few Navajo speaking people, but almost zero otherwise. Originally asset specificity ... have realized that asset specificity could be bilateral, or even multi lateral. For example Joskow ... acknowledged the multidimensional property of asset specificity. For example, Williamson 1983 identified four dimensions of asset specificity Site specificity, e.g. a natural resource available at a certain location and movable only at great cost Physical asset specificity, e.g. a specialized machine tool or complex computer system designed for a single purpose Human asset specificity, i.e., highly ... made an important addition to the above list Time specificity, an asset is time specific if its value ... costs inherent in a market based relationship Zaheer and Venkatraman 1994 acknowledge four asset specificity ... of asset specificity in their study human asset specificity and the newly developed procedural asset specificity , where Human asset specificity deals with the degree to which skills, knowledge and experience of the agency s personnel are specific to the business process. Procedural asset specificity incorporates notions of human asset specificity and refers to the degree that an agency s workflows ... focus on the relationships between asset specificity and sunk cost effects, transaction costs , vertical ... 1994 . Operationalization Asset specificity is usually operationalized using one of the following ... more details
Sensitivity and specificity are statistical measures of the performance of a binary classification classification rule test , also known in statistics as Statistical classification classification function ... as having the condition . Specificity measures the proportion of negatives which are correctly identified ... as sick and 100 specificity i.e. not predict anyone from the healthy group as sick , however theoretically ... like belt buckles and keys low specificity , in order to reduce the risk of missing objects that do ... i.e. all sick people are recognized as being ill. Thus, in contrast to a high specificity test, negative ... II errors Type II error type II error rate. SpecificitySpecificity relates to the ability of the test .... The specificity of a test is defined as the proportion of patients who do not have the disease who will test negative for it. This can also be written as math text specificity frac text number ... specificity, a positive result from the test means a high probability of the presence of disease ... 100 specificity. Therefore the specificity alone cannot be used to determine whether a test is useful in practice. A test with a high specificity has a low Type I and type II errors type I error rate ... and low specificity File LowSensitivity HighSpecificity 1400x1050.png Low sensitivity and high specificity ... identify those with the disease true ve rate , whereas test specificity is the ability of the test ... has 96 specificity. A highly specific test is unlikely to give a false positive result a positive result should thus be regarded as a true positive. A sign or symptom with very high specificity ... ACC math ACC TP TN TP TN FP FN math Specificity tests specificity SPC or True Negative Rate math SPC ... tests. 1 Sensitivity and specificity journal BMJ volume 308 issue 6943 pages 1552 year 1994 ... http faculty.vassar.edu lowry clin1.html Vassar College s Sensitivity Specificity Calculator References Reflist Medical research studies DEFAULTSORT Sensitivity And Specificity Category Statistical ... more details
, attentional, and motor deficits. Current proponents of domain specificity argue that evolution ... specificity in a variety of ways. Some look for unique cognitive signatures thought to characterize .... Prominent proponents of domain specificity include Jerry Fodor , Noam Chomsky , Stephen ... Domain Specificity vs. Domain Generality Domain specificity vs. domain generality in evolutionary ... and Culture , a collection of essays on domain specificity. Category Interdisciplinary fields Psychological ... more details
wiktionarypar factor A factor , a Latin word meaning who which acts , may refer to In commerce Factor agent , a person who acts for another, notably a mercantile and or colonial agent Factor Scotland , a person or firm managing a Scottish estate Factors of production , a resource used in the production of goods and services Factoring finance , an entity providing commercial finance services Max Factor , a cosmetics company founded by Max Factor, Sr. In science An enzyme , proteins that catalyze chemical ... to affect an experiment see design of experiments Sun protection factor , a unit describing reduction in transmitted ultraviolet light Factor B and factor D , peptides involved in the alternate pathway ... non trivial divisors A coefficient , a multiplicative factor in an expression, usually a number A von Neumann algebra with a trivial center Factor graph theory , a spanning subgraph Any finite contiguous subsequence of a Word mathematics word In statistics Factor analysis is the study of how factors ... technology Authentication factor , a piece of information used to verify a person s identity for security purposes Factor programming language , a concatenative stack oriented programming language A substring , a subsequence of consecutive symbols in a string In television The O Reilly Factor , an American talk show hosted by Bill O Reilly on Fox News The Krypton Factor , a British game show hosted by Gordon Burns, formerly on ITV The Krypton Factor US game show The Krypton Factor US game show American version People Max Factor, Sr. , a Polish American businessman and cosmetician Max Factor, Jr. , son of the above, born Francis Factor John Factor , a Prohibition era gangster Organizations FACTOR , the Foundation to Assist Canadian Talent on Records disambig ar ca Factor cs Faktor da Faktor de Faktor es Factor eu Faktore argipena fr Facteur io Faktoro it Fattori nl Factor ja no Faktor pl Faktor ro Factor ru simple Factor sk Faktor fi Faktori sv Faktor uk ... more details
Orphan date February 2009 Notability date May 2008 Factor T is a book first published in 1956 written by the Polish writer, philosopher, filmmaker, composer and poet Stefan Themerson . ref cite journal last Wisdom first J. O. authorlink John Wisdom year 1958 month May title Review journal The British Journal for the Philosophy of Science volume 9 issue 33 pages 84 85 url http www.jstor.org sici?sici 0007 0882 195805 9 3A33 3C84 3AFT 3E2.0.CO 3B2 F accessdate 2008 05 14 doi 10.1093 bjps IX.33.84 ref Factor T is based upon Themerson s theory that the eternal tragedy factor T of humanity is found in the conflict between the urge to satisfy certain desires and the aversion against the actions required for such a satisfaction. References reflist philo book stub Category 1956 books Category Polish non fiction books nl Factor T ... more details
FACTOR the Foundation to Assist Canadian Talent on Records is a private non profit organization, ... dedicated to providing assistance toward the growth and development of the Canadian independent recording industry from http www.factor.ca whatisfactor.html their website . Founded in 1982 , FACTOR has been administering public money since 1986 . From an inaugural budget of 200,000 Canadian dollar CAD , they now distribute over 11.5 million dollars annually. The merit based approach of monetary distribution used by FACTOR and Canadian music video funding organization VideoFACT , is not without critics. In 2009, the organizations came under public scrutiny when a letter written by Unfamiliar Records founder Greg Ipp was republished on the internet ref http www.thedailyswarm.com swarm open letter canadas music industry grant system why does metric mstrkrft and well funded mediocrity get all support ref in turn promoting the idea that bigger image based bands shouldn t be getting such a huge amount of those finite funds as it leaves relatively little, if any, funding for the smaller up and coming bands. ref http www.exclaim.ca articles generalarticlesynopsfullart.aspx?csid1 134&csid2 844&fid1 39899 ref Notable recording artists who have received FACTOR grants include Alexisonfire Jann Arden Bedouin Soundclash Blue Rodeo Dave Borins Boy Canadian band BOY Jason Collett The Dears K naan Mark Sultan Metric band Metric Michael Kulas Moneen Propaghandi Protest The Hero Sam Roberts The Trews Wolf Parade Woodpigeon band Woodpigeon Xavier Rudd References reflist External links http www.factor.ca The FACTOR website Canada stub Category Canadian music industry ... more details
Infobox television show name The It Factor image caption show name 2 genre Reality television format creator developer writer director creative director presenter starring judges voices narrated theme music composer opentheme endtheme composer country United States language English language English num seasons 2 num episodes list episodes executive producer producer editor location cinematography camera runtime 30 minutes company distributor channel Bravo US TV channel Bravo picture format audio format first run first aired Start date 2002 1 6 last aired End date 2003 3 31 status Ended preceded by followed by related website production website The It Factor is a reality television show that aired on the Bravo US TV network Bravo network. It followed actors trying to lead successful careers. The show lasted for two seasons. The first season profiled actors in New York City and the second season profiled actors in Los Angeles . Notable actors who appeared on the show include Oscar nominee Jeremy Renner , model actress LisaRaye , Michaela Conlin who went on to become a regular on the TV series Bones TV series Bones , and Godfrey comedian Godfrey who became a spokesman for 7 Up . External links imdb title 0307762 The It Factor imdb title 0348510 The It Factor Los Angeles DEFAULTSORT It Factor Category 2000s American television series Category 2002 American television series debuts Category 2003 American television series endings Category American reality television series Category Bravo U.S. television series US reality tv stub ... more details
Dual specificity phosphatase is a form of phosphatase that can act upon tyrosine or serine threonine residues. ref MeshName Dual Specificity Phosphatases ref References reflist Intracellular signaling peptides and proteins Protein tyrosine phosphatases Category Enzymes biochem stub ... more details
enzyme Name Dual specificity kinase EC number 2.7.12.1 CAS number 134549 83 0 IUBMB EC number 2 7 12 1 GO code image width caption In biochemistry , a dual specificity kinase EC number 2.7.12.1 is a kinase that can act as both tyrosine kinase and Serine threonine specific protein kinase serine threonine kinase . MEK s, involved in Mitogen activated protein kinases MAP pathways , are principal examples of dual specificity kinases. Other common examples include ADK1 Arabidopsis dual specificity kinase 1 CLK1 , CLK2 , CLK3 , CLK4 DSTYK DYR1A , DYR1B , DYRK2 , DYRK3 , DYRK4 Mps1p TESK1 , TESK2 TTK gene TTK The systematic name of this enzyme class is ATP protein phosphotransferase Ser Thr and Tyr phosphorylating . References reflist 1 cite journal author Dhanasekaran N, Premkumar Reddy E year 1998 title Signaling by dual specificity kinases journal Oncogene volume 17 issue 11 Reviews pages 1447 1455 pmid 9779990 doi 10.1038 sj.onc.1202251 cite journal author Ali N, Halfter U, Chua NH year 1994 title Cloning and biochemical characterization of a plant protein kinase that phosphorylates serine, threonine, and tyrosine journal J. Biol. Chem. volume 269 pages 31626 9 pmid 7527390 issue 50 cite journal author Lauze E, Stoelcker B, Luca FC, Weiss E, Schutz AR, Winey M year 1995 title Yeast spindle pole body duplication gene MPS1 encodes an essential dual specificity protein kinase journal EMBO J. volume 14 pages 1655 63 pmid 7737118 issue 8 pmc 398258 cite journal author Menegay HJ, Myers MP, Moeslein FM, Landreth GE date Pt 18 title Biochemical characterization and localization of the dual specificity kinase CLK1 journal J. Cell. Sci. volume 113 pages 3241 53 pmid 10954422 cite journal author Cleghon V year 2003 title dDYRK2 a novel dual specificity tyrosine phosphorylation regulated kinase in Drosophila journal Biochem. J. volume 374 pages 381 91 pmid 12786602 doi 10.1042 BJ20030500 last2 Sibbet first2 G last3 Kinstrie first3 R last4 Cleghon first4 T last5 Rylatt first5 M last6 ... more details
The encoding specificity principle provides a framework for understanding how contextual information affects memory and recall . ref name Tulving cite journal last Thomson first Donald coauthors Endel Tulving title Encoding specificity and retrieval processes in episodic memory journal Psychological Review year 1973 volume 80 issue 5 pages 352 373 ref The principle, proposed by researchers Thompson and Tulving , states that memory is most effective when information available at Encoding memory encoding is also present at Retrieval cue retrieval . The principle explains why a subject is able to recall a target word as part of an unrelated word pair at retrieval with much more accuracy when prompted with the unrelated word than if presented with a semantically related word that was not available during encoding. ref name Semantics revisited cite journal last Hannon first Brenda coauthors Fergus Craik title Encoding specificity revisited The role of semantics journal Canadian Journal of Experimental Psychology year 2001 volume 55 issue 3 pages 231 243 ref In addition, people benefit equally from a weakly related cue word as from a strongly related cue word during a recall task, provided the weakly related word was present at encoding. ref name Alzheimers RI 48 cite journal last Adam ... of encoding specificity for the diagnosis of early AD The RI 48 task journal Journal of Clinical ... Results The Role of Semantics Semantics do not always play a role in encoding specificity memory ... A semantic interpretation of encoding specificity journal Journal of Experimental Psychology year 1974 .... ref name Music auditory In line with the encoding specificity principle, this mismatch at encoding ... imagery specificity in alcohol state dependent learning journal Journal of Experimental Psychology ... dependency effect of the encoding specificity principle and is much more apparent with low ... opponent of Thomson and Tulving s encoding specificity principle. ref name Textbook He argues ... more details
Cleavage factors are two closely related protein s involved in the cleavage of the 3 signaling region from a newly synthesized pre messenger RNA mRNA molecule in the process of transcription genetics gene transcription . The cleavage is the first step in adding a polyadenylation polyadenine tail to the pre mRNA, which is one of the necessary post transcriptional modification s necessary for producing a mature mRNA. There are two cleavage factors involved in the assembly of the protein complex that mediates this process, CFI and CFII. They are recruited to the cleavage site by cleavage and polyadenylation specificity factor and cleavage stimulatory factor , and form a complex that also includes polyadenine polymerase , which performs the polyadenylation reaction. References Lodish H, Berk A, Matsudaira P, Kaiser CA, Krieger M, Scott MP, Zipursky SL, Darnell J. 2004 . Molecular Cell Biology. WH Freeman New York, NY. 5th ed. Stumpf G, Domdey H. 1996 . Dependence of yeast pre mRNA 3 end processing on CFT1 a sequence homolog of the mammalian AAUAAA binding factor. Science 274 5292 1517 20. protein stub Post transcriptional modification Category Proteins Category Gene expression ... more details
A release factor is a protein that allows for the termination of Translation biology translation by recognizing the termination codon or stop codon in a mRNA sequence. During translation of mRNA, most codons are recognized by charged tRNA molecules, called aminoacyl tRNA s because they are adhered to specific amino acid s corresponding to each tRNA s anticodon . In the standard genetic code , there are three mRNA stop codons UAG amber , UAA ochre , and UGA opal or umber . Although these stop codons are triplets just like ordinary codons, they are not decoded by tRNAs. Instead, it was discovered by Mario Capecchi in 1967 that tRNAs do not ordinarily recognize stop codons at all, and that what he named release factor was not a tRNA molecule, but a protein. ref Capecchi, M. R. 1967 . Polypeptide chain termination in vitro Isolation of a release factor. Proc. Natl. Acad. Sci. USA 58 1144 1151. ref Later, it was demonstrated that different release factors recognize different stop codons. ref Scolnick, E., R. Tompkins, T. Caskey, and M. Nirenberg 1968 . Release factors differing in specificity for terminator codons, Proceedings of National Academy of Sciences USA 61 772. ref Prokaryotic translation termination is mediated by three release factors RF1 RF2 and RF3. ref name MolBio book Weaver, Robert F. 2005 . Molecular Biology, p.616 621. McGraw Hill, New York, NY. ISBN 0072846119. ref RF1 recognizes the termination codons UAA and UAG RF2 recognizes UAA and UGA RF3 is a GTP binding protein that facilitates the binding of RF1 and RF2 to the ribosomal complex Eukaryotic translation termination similarly involves two release factors eRF1 and eRF3. ref name MolBio book eRF1 recognizes all three termination codons eRF3 is a ribosome dependent GTPase that helps eRF1 release the completed polypeptide References references External links MeshName Termination Release Factor protein stub GeneticTranslation Category Proteins pl Czynnik uwalniaj cy ru uk ... more details
wiktionary X factor X factor x factor x factor X factor may refer to X Factor comics , a 1986 American Marvel Comics comic book series, a spin off of the X Men franchise X Factor professional wrestling , a 2001 professional wrestling stable in the World Wrestling Federation WWF Ex Factor , a 1998 song by American hip hop artist, Lauryn Hill The Ex Factor , episode 36 of the 2003 American teen drama television series, The O.C. The X Factor album The X Factor album , a 1995 album by English heavy metal band, Iron Maiden The X factor , nickname of Dante Hall , American football player The X Factor ... phone cards In television The X Factor TV series The X Factor TV series , a television music competition ... to The X Factor UK The X Factor UK The X Factor, XSeer Al Najah , pan Arab version X Factor Albania X Factor Armenia X Factor Armenia The X Factor Australia The X Factor Australia X Factor Belgium X Factor Belgium X Factor Bulgaria X Factor Bulgaria El factor X Colombia El Factor X Colombia X Factor Czech Republic X Factor Czech Republic X Factor Denmark X Factor Denmark X Factor Finland X Factor Finland X Factor France X Factor France X Factor Germany X Factor Germany The X Factor Greece The X Factor Greece X Factor Hungary X faktor Hungary X Factor Iceland X Factor Iceland X Factor India X Factor India X Factor Indonesia X Factor Indonesia X Factor Italy X Factor Italy X Factor Kazakhstan X Factor Kazakhstan X Factor Netherlands X Factor Netherlands The X Factor New Zealand The X Factor New Zealand X Factor Norway X Factor Norway X Factor Poland X Factor Poland Faktor A Faktor A Russia Factor X Spain Factor X Spain The X Factor Ukraine The X Factor Ukraine The X Factor U.S. The X Factor U.S. See also Factor X disambiguation disambig da X Factor flertydig de X Factor es Factor X fr X Factor it X Factor disambigua nl X Factor ja X pt X Factor desambigua o fi X Factor sv X Factor ... more details
K factor or K factor may refer to K factor actuarial K factor aerospace K factor centrifugation K factor engineering K factor fire protection k factor graph theory k factor graph theory K factor marketing K factor crude oil refining K factor sheet metal K factor telecommunications Elo rating system K Factor , a producer remixer based in Washington, DC The K Factor , a fictional TV show from British television show Harry Hill s TV Burp spoofing the X Factor A K factor is used to calculate when heating oil must be delivered disambiguation ... more details
F factor may refer to F factor conversion factor , a conversion unit used in diagnostic radiology Fertility factor , a sequence of bacterial DNA disambig ... more details
merge from Specificityfactor date January 2012 A sigma factorfactor is a Bacteria bacterial Transcription genetics transcription initiation factor that enables specific binding of RNA polymerase to gene promoter biology promoter s. Different sigma factors are activated in response to different environmental conditions. Every molecule of RNA polymerase contains exactly one sigma factor subunit, which in the model bacterium Escherichia coli is one of those listed below. E. coli has seven sigma ... to the sigma factor with a molecular weight of 70 Dalton unit kDa . Structure Sigma factors have ..., RpoS in E.coli . It is involved in ensuring the sigma factor will only bind the promoter when it is complexed ... factor or also called as primary sigma factor, transcribes most genes in growing cells. Makes the proteins necessary to keep the cell alive. sup 54 sup RpoN the nitrogen limitation sigma factor Sigma 38 &sigma sup 38 sup RpoS the starvation stationary phase sigma factor sup 32 sup RpoH the heat shock sigma factor, it is turned on when exposed to heat sup 28 sup RpoF the flagellar sigma factor sup 24 sup RpoE the extracytoplasmic extreme heat stress sigma factor sup 19 sup FecI the ferric citrate sigma factor, regulates the fec gene for iron transport There are also anti sigma factors that inhibit the function of sigma factors and anti anti sigma factors that restore sigma factor function ... beta , 1 beta prime , and 1 omega subunits binds a sigma factor to form a complex called the RNA ... factor must dissociate upon transition from transcription initiation to transcription elongation ... sup factor leaves the core enzyme once it has initiated transcription, and the free sup sup can link ... initiation factor sigma70 in transcription elongation single molecule analysis journal Mol. Cell ... Vladimir last9 Ebright first9 Richard H. External links MeshName Sigma Factor Transcription factors g0 Category Gene expression cs Sigma faktor de Sigma Faktoren es Factor sigma it Fattore sigma nl Sigmafactor ... more details
Orphan date February 2009 The F factor , in diagnostic radiology , is the conversion factor between rontgen s and rad unit rads or, in more modern units, coulomb s kg to gray unit grays . In other words, it converts between the amount of ionization in air rontgens and the absorbed dose in tissue rads . The two determinants are of the F factor are the atomic number effective Z of the material and the type of ionizing radiation being considered. Since the effective Z of air and soft tissue is approximately the same, the F factor is approximately 1 for many x ray imaging applications. However, bone has an F factor of up to 4, due to its higher effective Z. References Bushberg et al., 2002. The Essential Physics of Medical Imaging. Philadelphia Lippincott Williams & Wilkins. p. 55 Category Radiology ... more details
Image NodSm IV Ac,C16 2,S .svg right thumb 300px The structure of nod factor from Sinorhizobium meliloti . Nodulation Nod factors are signaling molecule s produced by bacteria known as rhizobia during the initiation of root nodule nodules on the root of legume s. A symbiosis is formed when legumes take up the bacteria. The rhizobia produce nitrogen for the plant, and the legumes produce leghemoglobin to carry away any oxygen that would inhibit nitrogenase activity. Nod factors structurally are lipochitooligosaccharides LCOs that consist of an acylation acylated chitin oligomeric backbone with various functional group substitutions at the terminal or non terminal residues. The number of N acetylglucosamine molecules vary among Nod factors however, generally the length of a chitin backbone is from 3 to 5. The exact chemical structure of the Nod factor that is recognised by the plant varies between bacterial species and is the basis for host symbiont specificity. Nod factors are recognized by a specific class of Receptor biochemistry receptor kinase s that have so called LysM protein domain domain s in their extracellular domains. The two LysM lysin motif receptor kinases NFR1 and NFR5 that appear to make up the Nod factor receptor were first isolated in the model organism model legume Lotus japonicus in 2003. They now have been isolated also from soybean and the model legume Medicago truncatula . NFR5 lacks the classical activation loop in the kinase domain . The NFR5 gene lacks intron s. Nod gene expression is induced by the presence of certain flavanoids in the soil, which are sectreted by the plant to attract the bacteria ref Jos Angelo Silveira Zuanazzi, Pierre Henri Clergeot, Jean Charles Quirion, Henri Philippe Husson, Adam Kondorosi,1 and Pascal Ratet 1998 . Production .... D nari and C.Gough 2005 . Nod factors and a diffusible factor from arbuscular mycorrhizal fungi stimulate ... Nod Factor Category Legumes Category Oligosaccharides Category Signal transduction Category ... more details
Friction factor can refer to Darcy friction factor Fanning friction factor Atkinson friction factor ventilation of mines See also coefficient of friction disambig Category Dimensionless numbers ... more details
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