saturation deletable image caption 1 Saturday, 3 October 2009 The oxygen haemoglobin dissociation ... dissociation curve plots the proportion of hemoglobin haemoglobin in its saturated form on the vertical ... pressure of oxygen in the blood PO sub 2 sub , and is determined by what is called haemoglobin s affinity for oxygen that is, how readily haemoglobin acquires and releases oxygen molecules into the fluid ... lesser degree. Haemoglobin is contained in erythrocytes, more commonly referred to as red blood cells. Under certain conditions, oxygen bound to the haemoglobin is released into the blood s plasma and absorbed into the tissues. Each haemoglobin molecule has the capacity to carry four oxygen molecules ... as a percentage, the oxygen saturation is the ratio of the amount of oxygen bound to the haemoglobin, to the oxygen carrying capacity of the haemoglobin. The oxygen carrying capacity of haemoglobin is determined by the type of haemoglobin present in the blood. The amount of oxygen bound to the haemoglobin at any time is related, in large part, to the partial pressure of oxygen to which the haemoglobin ... is typically high, and therefore the oxygen binds readily to haemoglobin that is present. As the blood circulates to other body tissue in which the partial pressure of oxygen is less, the haemoglobin releases the oxygen into the tissue because the haemoglobin cannot maintain its full bound capacity ... dissociation curve.png thumb Haemoglobin saturation curve. It is usually a sigmoid function sigmoid plot. A haemoglobin molecule can bind up to four oxygen molecules in a reversible way. The shape of the curve ... as a result of crowding of the haemoglobin molecule, partly as a natural tendency of oxygen to dissociate ... the partial pressure of oxygen x axis and the oxygen saturation y axis . Haemoglobin s affinity ..., very little additional binding occurs and the curve levels out as the haemoglobin becomes saturated ... oxygen to the tissue would require blood transfusions to increase the haemoglobin count and hence the oxygen ... more details
there are no haemoglobin based oxygen carriers or perfluorocarbon emulsions available for commercial ... transmission. Two main types of blood substitutes are in development haemoglobin based oxygen carrier ... G, Lamy M title Red blood cell substitutes fluorocarbon emulsions and haemoglobin solutions journal ... url http bmb.oxfordjournals.org cgi pmidlookup?view long&pmid 10695091 ref Haemoglobin based oxygen carriers Unmodified cell free haemoglobin The general task of blood within the frame of classic transfusion ... up carbon dioxide . All of this is accomplished with haemoglobin Hb , the oxygen carrier protein ... blood substitutes was focused on simple cell free solution of haemoglobin. ref name pmid12559026 ref ... 6820&date 2003&volume 253&issue 5&spage 527 ref Haemoglobin is a tetramer of two a and two b polypeptide .... This oxygen heme bond results in a conformational change in haemoglobin molecule, which progressively increases the affinity of haemoglobin for additional oxygen molecules. The main consequence ... bound or released by the haemoglobin. This is widely known as oxygen haemoglobin dissociation curves ..., product of RBC glycolytic pathway oxygen haemoglobin dissociation curve is shifted to the left resulting in an increased affinity of haemoglobin for oxygen. In contrast, by decreased pH increased ... nanotechnique product . However, it is of great importance that cell free haemoglobin maintains its ability to transport oxygen outside of the RBC. Stroma free haemoglobin has been investigated as an oxygen carrier since the 1940s, when researchers realized that native haemoglobin is not antigenic. The ability to transport oxygen outside of the RBC and that application of haemoglobin solution did ... that unmodified cell free haemoglobin had limitations, such as an oxygen affinity that was too high ... 1396709 ref Early studies conducted in experimental animals showed that infusion of free haemoglobin ..., and hypertension. ref name pmid5436128 The general problem was that solutions of acellular haemoglobin ... more details
disambig Dissociation curve may refer to Oxygen haemoglobin dissociation curve , a graphical representation of oxygen release from haemoglobin Melting curve analysis , a biochemical technique relying on heat dependent dissociation between two DNA strands ... more details
Blood worm or bloodworm is an ambiguous term and can refer to The larva of a non biting midge Family Chironomidae containing haemoglobin The polychaete Glycera genus Glycera , often used for fishing bait The worm, Lumbriculus variegatus , more commonly called blackworm, but often misnamed by pet stores. The nematode Strongylus vulgaris also known as the blood worm. A common horse parasite. disambig ... more details
Infobox Disease Name PAGENAME Image Caption DiseasesDB ICD10 ICD10 D 56 4 d 55 ICD9 ICD9 282.7 ICDO OMIM 141749 MedlinePlus eMedicineSubj eMedicineTopic MeshID Hereditary persistence of fetal hemoglobin HPFH, BrE Hereditary persistence of foetal haemoglobin is a benign condition in which significant fetal hemoglobin hemoglobin F production continues well into adulthood, disregarding the normal shutoff point after which only adult type hemoglobin should be produced. ref http cancerweb.ncl.ac.uk cgi bin omd?hereditary persistence of foetal haemoglobin ref Causes This is usually caused by mutation s in the globin gene cluster. Fact date September 2008 The percentage of incorrect expression might be as low as 10 15 or as high as 100 of the total hemoglobin, usually higher in homozygotes than in heterozygotes. ref http www.enerca.org PublicPages Anaemiascovered HereditarypersistanceoffoetalhaemoglobinHPFH tabid 177 Default.aspx ref Epidemiology HPFH may alleviate the severity of certain hemoglobinopathy hemaglobinopathies and thalassemia s, and is selected for in populations with a high prevalence of these conditions which in turn are often selected for in areas where malaria is endemic . Thus, it has been found to affect Americans of African and Greek descent. ref cite journal author Friedman S, Schwartz E title Hereditary persistence of foetal haemoglobin with beta chain synthesis in cis position Ggamma beta HPFH in a negro family journal Nature volume 259 issue 5539 pages 138 40 year 1976 month January pmid 1246351 doi 10.1038 259138a0 url http www.nature.com nature journal v259 n5539 abs 259138a0.html ref Presentation The condition is usually asymptomatic, and is only noticed when screening for other hemoglobin disorders. References reflist medicine stub Myeloid hematologic disease Category Hereditary hemolytic anemias Category Disorders of globin and globulin proteins ru ... more details
, sometimes called artificial haemoglobin , is an artificially made blood substitute whose main function is to carry oxygen , as does natural haemoglobin . The use of oxygen carrying blood substitutes ... is haemoglobin derived from humans, animals, or artificially via Recombinant DNA recombinant ... blood, and can be kept at room temperature. Most haemoglobin based oxygen carriers in trials today ... aid during combat than whole blood or packed red cells. Risks Haemoglobin based blood substitutes ..., May 21, 2008, Cell Free Haemoglobin Based Blood Substitutes and Risk of Myocardial Infarction and Death ... over blood substitutes that rely on modified haemoglobin, such as unlimited manufacturing capabilities ... per cubic centimeter cc than blood, while being 40 to 50 times smaller than haemoglobin. class sortable ... Approved an authorized blood substitute in Mexico in 2005. Haemoglobin based Main Haemoglobin based oxygen carriers Haemoglobin is the main component of red blood cells, comprising about 33 of the cell mass. Haemoglobin based products are called haemoglobin based oxygen carriers HBOCs . However, pure haemoglobin separated from red cells cannot be used, since it causes renal toxicity. It can be treated ... red cells. Various other steps are needed to form haemoglobin into a useful and safe oxygen therapeutic ... the red cell is not a simple container for haemoglobin, but a complex entity with many biomolecular ... for human use, and is a Haemoglobin Based Oxygen Carrier HBOC solution. It is made of chemically stabilized, cross linked bovine cow haemoglobin in a salt solution. Many safety measures are taken to render ... of chemically stabilized bovine haemoglobin in a balanced salt solution and contains no red blood cells. The cross linked haemoglobin, several tetramers bound together, works by circulation in the plasma ... US Phase III Trial, failed FDA approval. PolyHeme is a haemoglobin based oxygen carrier and, as the only ... for both military and civilian use. PolyHeme uses human haemoglobin as the oxygen carrying molecule ... more details
by haemoglobin , and thus their haemolymph is red rather than blue. Some gastropods, such as the sea ... haemocyanin or haemoglobin, the pigments are dissolved directly in the Blood serum serum , with no equivalent ... more details
DPG may refer to Defense Planning Guidance provides basis for the U.S. National Military Strategy The Diplomatic Protection Group is a branch of the London Metropolitan Police . The Deutsche Physikalische Gesellschaft German Physical Society. A name for Tha Dogg Pound a gangsta rap group D ogg P ound G angstaz . The D.P.G. Recordz record label . The Dugway Proving Ground , a US Army chemical and biological testing facility. Dulwich Picture Gallery , London, UK. A chemical mixture dipropylene glycol , used in industry. A metabolite 1,3 bisphosphoglycerate in glycolysis . A chemical 2,3 Bisphosphoglycerate 2,3 Diphosphoglycerate , involved in haemoglobin oxygen binding. Digital pair gain , a telecommunications term for delivering multiple phone lines over a single copper pair. A video format for the Nintendo DS , known as nDs mPeG . disambig da DPG de DPG it DPG ja DPG ... more details
Multiple issues orphan August 2009 Gold number is a term used in colloidal chemistry . It is defined as the minimum amount of lyophilic colloid in milligrams which prevents the coagulation of 10 ml gold sol against 1 ml of 10 NaCl solution. Coagulation of gold sol is indicated by colour change from red to blue when particle size just increases. More is the gold number less is the protective power of the lyophilic colloid since it means that the amount required is more.It was first used by Zsigmondy .The amount is taken in terms of weight in milligrams. The gold number of some colloid s is given below. class wikitable border 1 Protective Colloids Gold Number Gelatin 0.005 .01 Haemoglobin 0.03 Egg Albumin 0.15 0.25 Potato starch Potato Starch 25 Gum arabic 0.15 0.25 Caseinate 0.01 Sodium oleate Sodium Oleate 0.4 Dextrin 6 20 DEFAULTSORT Gold Number Category Colloidal chemistry ... more details
Orphan date June 2011 Polychromasia or Polychromatophilia refers to having red blood cells of multiple colours, particularly gray blue. ref Lichtman MA, Shafer JA, Felgar RE, Wang N, C. Red Cell Alterations in Non Clonal Hematological Disorders Chapter . Lichtman MA, Shafer JA, Felgar RE, Wang N Lichtman s Atlas of Hematology http www.accessmedicine.com content.aspx?aID 2781618. ref This is due to differing amounts of haemoglobin in each cell, ref http medical dictionary.thefreedictionary.com polychromasia ref which is due to innapropriate, premature release from the bone marrow . This is commonly due to leukaemia , metastatic disease , pyruvate kinase deficiency and immune mediated haemolytic anaemia IMHA . References Reflist Med stub Category Red blood cell disorders ... more details
File Nencki.jpg thumb Marceli Nencki. Wilhelm Marceli Nencki 1847, Boczki, Zdu ska Wola County 1901, Saint Petersburg was a famous Poles Polish chemist and doctor. Work Nencki s main scientific interest concentrated on urea synthesis, the chemistry of purines and biological oxidation of aromatic Chemical compound compounds . He was also interested in the structure of proteins , enzymes enzymatic processes in the intestine and bacteria l biochemistry . One of his achievements was for example demonstration that urea is formed in the organism from amino acids rather than being preformed on a protein molecule and that it is accompanied by binding of carbon dioxide . He proposed that the synthesis of fatty acids proceeds stepwise, by a gradual condensation of two carbon atom fragments and that oxidation of fatty acids occurs by splitting into two carbon units. Among Nencki s greatest achievements was his study on the chemical structure of haemoglobin . He identified haemopyrrole among degradation products of haemoglobin and showed its identity with one of the products obtained by Leon Marchlewski from chlorophyll . He was the first to rigorously analyze the cause of Asparagus Asparagus and urine smell in urine following eating asparagus , which he attributed to methanethiol . ref cite journal doi 10.1007 BF01824333 last Nencki first Marceli author link Marceli Nencki year 1891 title Ueber das vorkommen von methylmercaptan im menschlichen harn nach spargelgenuss journal Arch Exp Path Pharmak volume 28 pages 206 209 ref He made Phenyl salicylate or salol in 1886, and introduced it as a mild intestinal antiseptic which it is not . The salol principle or nencki principle or salol nencki principle ... is used to design drugs . References references External links Persondata Metadata see Wikipedia Persondata . NAME Nencki, Marceli ALTERNATIVE NAMES SHORT DESCRIPTION DATE OF BIRTH 1847 PLACE OF BIRTH DATE OF DEATH 1901 PLACE OF DEATH DEFAULTSORT Nencki, Marceli Category 1847 bi ... more details
Orphan date February 2009 SIAscopy measures the amount of haemoglobin , melanin and collagen in the stratum corneum , Epidermis skin epidermis and dermis to a depth of 2 mm, and identifies whether melanin is present in the epidermis or the dermis. The information is presented as SIAscans, which show how these components vary over the skin. SIAscopy makes use of the way light interacts with skin the way it scatters or bounces and the amount absorbed by cells and other structures and how this varies for different wavelengths or colours of light and is based on Symon Cotton s Thesis PhD thesis . ref Cotton S. D 1998 A non invasive Medical imaging imaging system for assisting in the diagnosis of Melanoma malignant melanoma . PhD thesis. University of Birmingham Birmingham University , UK ref ref M. MONCRIEFF,S. COTTON, E. CLARIDGE AND P. HALL 2002 Spectrophotometric intracutaneous analysis a new technique for imaging pigmented skin lesions, British Journal of Dermatology 2002 146 448 457. ref Due to the multi layered structure of the skin, and because the most prominent chromophores have slowly varying spectral properties, it is possible to generate models which can predict the method of light transport within skin. This allows analysis of the skin using broadband Spectrophotometry spectrophotometric techniques. The device used to capture the information is a SIAscope. In order to generate the model, simulations are run for hundreds of thousands of different combinations of haemoglobin, melanin, collagen and dermal melanin. The result of each simulation represents how the camera would respond if it was to image the corresponding combination of skin chromophore s. This information is stored, and then interrogated during each scan in order to generate SIAscans. Each SIAscan is a bitmap representing the concentration of each chromophore on every pixel. Image siaa.JPG thumb Handheld SIAscanner Image 12 NewStripRot90.jpg thumb Example SIAscan of melanoma, From Left color ... more details
Infobox poultry breed name Ayam Cemani image Cemani.jpg image caption ayam cemani female altname ayam cemani country Indonesia apa apagroup Asiatic aba abagroup maleweight 2 2,5 kg femaleweight 1,5 2 kg skincolor Black eggcolor Cream comb Ayam Cemani is a breed of chicken , originating in Indonesia . It is rarely kept breed. Name Ayam means chicken in Indonesian language and Cemani is name of village on Central Java . Origin The breed originated in Cemani village near Surakarta city on the Java , Indonesia . It was first time imported into Europe in 1998 by Dutch breeder Jan Steverink. Nowadays it is kept in the Netherlands , Germany , Slovakia and Czechia . There are many descendants of the Ayam Cemani including In Sweden the Swedish Black Chicken . It is thought that Ayam Cemani may have been brought to Europe by the Dutch VOC seamen on board the maritime company VOC that had numerous contacts in both Africa and Asia. ref http www.nederlandsepluimveesoc.com Nieuws 20Engels.html European Poultry Society ref Description The birds are completely black black plumage with a greenish shine, black legs and toe nails, black beak and tongue, black comb and wattles, black meat and bones and even dark blood Not Black and organs. The roosters weigh 2 2,5 kg and the hens from 1.5 2 kg. The hens are nonsitters, produce 80 eggs per year of 45 g weight. ref http www.indiez.de html gefluegel Cemani.html Ayam Cemani ref Despite many rumours the blood of the Ayam Cemani is NOT black as this would be a scientific impossibility. When haemoglobin binds oxygen to it is turns red when the O2 is depleted it goes blue hence blue lips in the cold de oxygenated blood is kept in the extremeties and the warm oxygenated blood stays close to the internal organs if you lips were blue and you cut your lip, the blood would still appear red as it would oxygenate the Haemoglobin on contact with the air. References references Chicken Category Chicken breeds Category Chicken breeds ... more details
File 1GZX Haemoglobin.png thumb 200px The heterotetrameric molecule haemoglobin , made up of four subunits of two different types coloured red and blue . A heterotetramer is protein containing four non covalently bound subunits, wherein the subunits are not all identical. ref cite web title GO term protein heterotetramerization url http www.yeastgenome.org cgi bin GO goTerm.pl?goid 51290 publisher YeastGenome accessdate 14 May 2011 ref A homotetramer contains four identical subunits. ref cite web title GO term protein homotetramerization url http www.yeastgenome.org cgi bin GO goTerm.pl?goid 51289 publisher YeastGenome accessdate 14 May 2011 ref Examples include haemoglobin pictured , the NMDA receptor , some aquaporin s, ref cite journal last Neely first John D. coauthors Christensen, Birgitte M., Nielsen, S ren, Agre, Peter title Heterotetrameric Composition of Aquaporin 4 Water Channels journal Biochemistry date 1 August 1999 volume 38 issue 34 pages 11156 11163 doi 10.1021 bi990941s accessdate 14 May 2011 pmid 10460172 ref some AMPA receptor s, as well as some enzyme s. ref cite journal last Chang first T. H. coauthors Hsieh, F. L., Ko, T. P., Teng, K. H., Liang, P. H., Wang, A. H. J. title Structure of a Heterotetrameric Geranyl Pyrophosphate Synthase from Mint Mentha piperita Reveals Intersubunit Regulation journal THE PLANT CELL ONLINE date 5 February 2010 volume 22 issue 2 pages 454 467 doi 10.1105 tpc.109.071738 accessdate 14 May 2011 ref See also Tetrameric protein References reflist Category Protein complexes protein stub ... more details
Afterdamp is the toxic mixture of gases left in a mine following an explosion caused by firedamp , which itself can initiate a much larger explosion of coal dust . It consists of carbon dioxide , carbon monoxide and nitrogen . Hydrogen sulfide , another highly toxic gas, may also be present. However, it is the high content of carbon monoxide which kills by depriving victims of oxygen by combining preferentially with haemoglobin in the blood. Afterdamp was the deadly gas which caused the majority of casualties in the many pit disasters of the British coalfields, and elsewhere in the world. Such disasters continue to afflict working mines, especially in mainland China. Image Yellow finch 1.jpg thumb 100px Domestic Canary Detection Small animals, such as mice , or Domestic Canary canaries are more sensitive to the gas than humans, so will give a warning to miners. Canaries were introduced into British collieries in the 1890s by John Scott Haldane , the noted physiologist. Gas detectors are available now which detect toxic gases such as carbon monoxide at very low levels. The levels of gas detection depend on the methods used. References JS Haldane and JG Priestley, Respiration , Oxford University Press, 2nd ed. 1935 Damp Category Mine safety mining stub explosive stub ... more details
Unreferenced date April 2009 A conjugated protein is a protein that functions in interaction with other chemical groups attached by covalent bond s or by weak interactions. Many proteins contain only amino acid s and no other chemical groups, and they are called simple proteins. However, other kind of proteins yield, on hydrolysis, some other chemical component in addition to amino acids and they are called conjugated proteins. The nonamino part of a conjugated protein is usually called its prosthetic group . Most prosthetic groups are formed from vitamins. Conjugated proteins are classified on the basis of the chemical nature of their prosthetic groups. Some examples of conjugated proteins are lipoprotein s, glycoprotein s, phosphoprotein s, hemoprotein s, flavoprotein s, metalloprotein s, phytochrome s, cytochrome s and opsin s. Haemoglobin contains the prosthetic group containing iron, which is the heme . It is with in the heme group that carries the oxygen molecule through the binding of the oxygen molecule to the iron ion Fe2 found in the heme group. Glycoproteins are generally the largest and most abundant group of conjugated proteins. They range from glycoproteins in cell surface membranes that constitute the glycocalyx , to important antibodies produced by leukocytes . Category Proteins protein stub es Prote na conjugada fr H t roprot ine ja pt Prote na conjugada ru uk zh ... more details
Hemoglobin Barts consists of four gamma chains. It is moderately insoluble, and therefore accumulates in the red blood cells. It has an extremely high affinity for oxygen, resulting in almost no oxygen delivery to the tissues. It is produced in the disease alpha thalassemia and in the most severe of cases, it is the only form of haemoglobin in circulation. In this situation, a fetus will develop hydrops fetalis and normally die before or shortly after birth, unless intrauterine blood transfusion is performed. Since Hemoglobin Barts is elevated in alpha thalassaemia, it can be measured, providing a useful screening test for this disease in some populations. ref Cite journal author F. P. van der Dijs , M. Volmer , D. G. van Gijssel Wiersma , J. W. Smit , R. van Veen & F. A. Muskiet title Predictive value of cord blood hematological indices and hemoglobin Barts for the detection of heterozygous alpha thalassemia 2 in an African Caribbean population journal Clinical chemistry volume 45 issue 9 pages 1495 1500 year 1999 month September pmid 10471652 ref This variant of hemoglobin is so called as it was discovered at St. Bartholomew s Hospital in London. The hospital has the fond sobriquet, St. Barts, and the hemoglobin was named hemoglobin Barts. Notes reflist Hemeproteins Category Hemoglobins biochemistry stub ... more details
Taxobox name Dikume image status CR status system IUCN2.3 regnum Animalia phylum Chordata classis Actinopterygii ordo Perciformes familia Cichlidae genus Konia fish Konia species K. dikume binomial Konia dikume binomial authority Ethelwynn Trewavas Trewavas , Green & Corbet, 1972 synonyms The dikume Konia dikume is a critically endangered species of fish in the Cichlidae family. It is Endemism endemic to Lake Barombi ma Mbu in western Cameroon . It is threatened because of pollution and Siltation sedimentation due to human activities, and potentially also by large emissions of carbon dioxide CO sub 2 sub from the lake s bottom compare Lake Nyos . Males can reach about 11,2 cm. Dikume eats mosquito larvae and has high levels of blood haemoglobin , an adaptation to oxygen poor deep water. Source World Conservation Monitoring Centre 1996. http www.iucnredlist.org search details.php 11054 all Konia dikume . http www.iucnredlist.org 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007. Category Fauna of Cameroon Category Konia Tilapiini stub ca Konia dikume es Konia dikume fr Konia dikume pt Konia dikume sr Konia dikume vi Dikume ... more details
Taxobox name Anadara granosa image Anadara granosa.jpg regnum Animal ia phylum Mollusca classis Bivalvia subclassis Pteriomorphia ordo Arcoida familia Arcidae genus Anadara species A. granosa binomial Anadara granosa binomial authority Carolus Linnaeus L. , 1758 Anadara granosa is a species of Arcidae ark clam known as the blood cockle due to the red haemoglobin liquid inside. It is found throughout the Indo Pacific region from eastern Africa to Australia to Polynesia to Japan . It lives mainly in the intertidal zone at one to two metres water depth, burrowed down into sand or mud. Adult size is about 5 to 6 cm long and 4 to 5 cm wide. ref Pathansali, D. 1966 . Notes on the biology of the cockle, Anadara granosa L. Proc. Indo Pacific Fish. Counc. 11 84 98 ref It has a high economic value as food, and it is kept in aquaculture . It is served steamed, boiled, roasted, or traditionally raw. References reflist External links commonscat http www.fao.org fishery species 3503 FAO Profile Edible molluscs Category Arcidae Category Edible molluscs bivalve stub id Kerang darah ja sl Rde emesa bar ica th vi S huy t ... more details
orphan date April 2010 Basic Features 1 Red blood cell Red cell indices and blood film appearances suggest Iron deficiency medicine iron deficiency , although peripheral blood changes are not usually as marked as in moderate or severe iron deficiency. 2 Erythropoiesis is abnormal because of ineffective iron utilisation with poor haemoglobin isation of red cell precursors and 3 Bone marrow iron stores are normal or increased and Sideroblastic anaemia sideroblasts may be frequent and abnormal. Causes 1 Secondary anaemia s Chronic infection inflammation Malignancy 2 Thalassaemia 3 Sideroblastic anaemia Differentiation from iron deficiency The serum iron and total iron binding capacity transferrin are helpful but not diagnostic it is quiet possible to have co existing ineffective iron utilisation and iron deficiency, as determined by bone marrow iron status,e.g. in rheumatoid arthritis . References 1 Aids to clinical haematology eds Child J.A. and Cuthbert A.C.ISBN 9780443041921. Category Anemias ... more details
The Root Effect is a physiological phenomenon that occurs in fish hemoglobin , named after its discoverer R. W. Root. It is the phenomenon where an increased proton or carbon dioxide concentration lower pH lowers hemoglobin s affinity and carrying capacity for oxygen ref cite journal author Ito N., Komiyama N. H., Fermi G. year 1995 title Structure of Deoxyhaemoglobin of the Antarctic Fish Pagothenia bernachii with an Analysis of the Structural Basis of the Root Effect by Comparison of the Liganded and Unliganded Haemoglobin Structures url journal Journal of Molecular Biology volume 250 issue pages 648 658 ref ref name Pelster2001 cite journal author Pelster B title The generation of hyperbaric oxygen tensions in fish journal News Physiol. Sci. volume 16 issue 6 pages 287 91 year 2001 month December pmid 11719607 doi url http physiologyonline.physiology.org content 16 6 287.long ref . The Root effect is to be distinguished from the Bohr effect where only the affinity to oxygen is reduced. Hemoglobins showing the root effect show a loss of cooperativity at low pH. This results in the Oxygen haemoglobin dissociation curve Hb O sub 2 sub dissociation curve being shifted downward and not just to the right. At low pH, hemoglobins showing the root effect don t become fully oxygenated even at oxygen tensions up to 20kPa ref name Pelster2001 .This effect allows hemoglobin in fish with swim bladder s to unload oxygen into the swim bladder against a high oxygen gradient ref name Verde, C. 2007 Verde, C., A. Vergara, D. Giordano, L. Mazzarella, and G. di Prisco. 2007. The Root effect a structural and evolutionary perspective. Antarctic Science 19 271 278. ref . The effect is also noted in the choroid rete , the network of blood vessel s which carries oxygen to the retina ref name Verde, C. 2007 . In the absence of the Root effect, Rete mirabile retia will result in the diffusion of some oxygen directly from the arterial blood to the venous blood, making such systems less effec ... more details
of various complications. The sickling occurs because of a mutation in the hemoglobin haemoglobin ... , haemoglobin S or permutations thereof. In heterozygous people, who have only one sickle gene and one normal adult haemoglobin gene, it is referred to as HbAS or sickle cell trait . Other, rarer forms of sickle cell disease include sickle haemoglobin C disease HbSC , sickle beta plus thalassaemia ... HbS and one copy of another abnormal haemoglobin allele . The term disease is applied, because .... Not all inherited variants of haemoglobin are detrimental, a concept known as genetic polymorphism ... in haemoglobin. This crisis takes 4 days to one week to disappear. Most patients can be managed ... drops in haemoglobin level. The red blood cells break down at a faster rate. This is particularly common ... by a point mutation in the globin chain of haemoglobin , causing the hydrophilic amino acid glutamic ... with two mutant globin subunits forms haemoglobin S HbS . Under low oxygen conditions being at high ... promotes the non covalent polymerisation aggregation of haemoglobin, which distorts red blood cells ..., humans have Haemoglobin A, which consists of two alpha and two beta chains, Haemoglobin A2, which consists of two alpha and two delta chains and Haemoglobin F, consisting of two alpha and two gamma chains in their bodies. Of these, Haemoglobin A makes up around 96 97 of the normal haemoglobin ... carrier carriers of sickling haemoglobin , the polymerisation problems are minor, because the normal allele is able to produce over 50 of the haemoglobin. In people homozygous for HgbS, the presence ... by valine to change its structure and function. Valine is hydrophobic, causing the haemoglobin to collapse in on itself occasionally. The structure is not changed otherwise. When enough haemoglobin ... 6. Haemoglobin S with this mutation is referred to as HbS, as opposed to the normal adult HbA. The genetic ... on the secondary structure secondary , tertiary structure tertiary , or quaternary structure of haemoglobin ... more details
File Aminoacid chain normal Hb and HbE.pdf right thumb First thirty amino acid of normal Hb on top and of HbE down . Hemoglobin E or haemoglobin E HbE is an abnormal hemoglobin with a single point mutation in the chain. At position 26 there is a change from a glutamate to a lysine . HbE is one of the most common variant of normal hemoglobin. Hemoglobin E can be detected on electrophoresis. This hemoglobin variant is very common in Southeast Asia and it has a low frequency in black and white people. The E mutation affects gene expression creating an alternate splicing site in the mRNA at codons 25 27 of the globin gene. Through this mechanism, there is a mild deficiency in normal mRNA and production of small amounts of anomalous mRNA. The reduced synthesis of chain may cause thalassemia. Also, this hemoglobin variant has a weak union between and globin, causing instability when there is a high amount of oxidant. ref Chernoff AI, Minnich V, Nanakorn S, et al. Studies on hemoglobin E. I. The clinical, hematologic, and genetic characteristics of the hemoglobin E syndromes. J Lab Clin Med. 1956 47 455 489 ref Hemoglobin E disease EE Hemoglobin E disease results when the offspring inherits the gen for HbE from both parents. At birth, babies homozygous for the hemoglobin E allele do not present symptoms due to HbF fetal hemoglobin they still have. In the first months of life, fetal hemoglobin disappears and the amount of hemoglobin E increases, so the subjects start to have a mild thalassemia. People with hemoglobin E do not show any symptom there is usually no anemia or hemolysis . Subjects homozygous for the hemoglobin E allele have a mild hemolytic anemia and mild splenomegaly. Hemoglobin E trait heterozygotes for HbE AE Heterozygotes AE occur when the gen for haemoglobin E is inherited from one parent and the gen for haemoglobin A from the other. This is called hemoglobin E trait, and it is not a disease. People who have hemoglobin E trait heterozy ... more details
HBB Haemoglobin, beta InterPro IPR002337 HBA1 Haemoglobin, alpha InterPro IPR002338 Myoglobin, trematode ... IPR013314 Globin, annelid type InterPro IPR013316 Haemoglobin, extracellular InterPro IPR014610 ... Haemoglobin Hb Myoglobin Mb Neuroglobin a myoglobin like haemprotein gene expression expressed ... bacteriods in order biology order to promote nitrogen fixation . Non symbiotic haemoglobin NsHb ... structural features. HbN or GlbN a truncated haemoglobin like protein that binds oxygen cooperatively ... url ref HbO or GlbO a truncated haemoglobin like protein with a lower oxygen affinity than HbN ... 11796724 doi 10.1074 jbc.M111478200 url ref Glb3 a nuclear encoded truncated haemoglobin from plant ... more details
Encyclopedia
top
