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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
01/06/2023 |
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Autoria: |
GIBBONS, R. A.; DIXON, S. N.; HALLIS, K.; RUSSELL, A. M.; SANSOM, B. F.; SYMONDS, H. W. |
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Título: |
Manganese metabolism in cows and goats. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Biochimica et Biophysica Acta, v. 444, n. 1, p. 1-10, 1976. |
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DOI: |
10.1016/0304-4165(76)90218-x. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: When 54MnCl2 was incubated with fresh bovine or caprine serum for 20 h and the serum subjected to electrophoresis at pH 9.5, the 54Mn bound to transferrin and alpha2-macroglobulin in proportions which varied with the temperature of incubation and the temperature of electrophoresis. Between 0 and 37 degrees C, the higher the temperature of incubation the larger the proportion bound to transferrin and the lower the proportion bound to alpha2-macroglobulin. The temperature at which electrophoresis was performed had little effect on the proportion of 54Mn bound to transferrin, but increasing temperature reduced the proportion of 54Mn bound to alpha2-macroglobulin. Mn2+ did not bind to purified transferrin in vitro in the absence of an oxidising agent. In the presence of permanganate, Mn3+ was formed and chelated by transferrin at physiological pH. In fresh serum this oxidation step may be performed by ceruloplasmin or molecular oxygen. Mn2+ was bound reversibly to alpha2-macroglobulin but this protein played no part in the oxidation of divalent manganese and had no effect on the protein binding of trivalent manganese. Manganese in the divalent state, either free as Mn2+ or bound to alpha2-macroglobulin, is removed from blood plasma very efficiently by the liver. However, the manganic-transferrin complex normally found in circulation is not rapidly removed from plasma. The liver can remove large amounts of excess manganous manganese which it presumably excretes; the small essential fraction of the manganese absorbed is oxidised to the trivalent state and bound to transferrin. MenosAbstract: When 54MnCl2 was incubated with fresh bovine or caprine serum for 20 h and the serum subjected to electrophoresis at pH 9.5, the 54Mn bound to transferrin and alpha2-macroglobulin in proportions which varied with the temperature of incubation and the temperature of electrophoresis. Between 0 and 37 degrees C, the higher the temperature of incubation the larger the proportion bound to transferrin and the lower the proportion bound to alpha2-macroglobulin. The temperature at which electrophoresis was performed had little effect on the proportion of 54Mn bound to transferrin, but increasing temperature reduced the proportion of 54Mn bound to alpha2-macroglobulin. Mn2+ did not bind to purified transferrin in vitro in the absence of an oxidising agent. In the presence of permanganate, Mn3+ was formed and chelated by transferrin at physiological pH. In fresh serum this oxidation step may be performed by ceruloplasmin or molecular oxygen. Mn2+ was bound reversibly to alpha2-macroglobulin but this protein played no part in the oxidation of divalent manganese and had no effect on the protein binding of trivalent manganese. Manganese in the divalent state, either free as Mn2+ or bound to alpha2-macroglobulin, is removed from blood plasma very efficiently by the liver. However, the manganic-transferrin complex normally found in circulation is not rapidly removed from plasma. The liver can remove large amounts of excess manganous manganese which it presumably excretes; the sma... Mostrar Tudo |
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Palavras-Chave: |
Alpha-Macroglobulins; Hepatic veins; Maganes. |
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Thesagro: |
Caprino; Sangue. |
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Thesaurus Nal: |
Cattle; Females; Goats; Liver; Manganese; Metabolism; Protein binding; Temperature; Transferrin. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02522naa a2200361 a 4500
001 1522342
005 2023-06-01
008 1976 bl uuuu u00u1 u #d
024 7 $a10.1016/0304-4165(76)90218-x.$2DOI
100 1 $aGIBBONS, R. A.
245 $aManganese metabolism in cows and goats.$h[electronic resource]
260 $c1976
520 $aAbstract: When 54MnCl2 was incubated with fresh bovine or caprine serum for 20 h and the serum subjected to electrophoresis at pH 9.5, the 54Mn bound to transferrin and alpha2-macroglobulin in proportions which varied with the temperature of incubation and the temperature of electrophoresis. Between 0 and 37 degrees C, the higher the temperature of incubation the larger the proportion bound to transferrin and the lower the proportion bound to alpha2-macroglobulin. The temperature at which electrophoresis was performed had little effect on the proportion of 54Mn bound to transferrin, but increasing temperature reduced the proportion of 54Mn bound to alpha2-macroglobulin. Mn2+ did not bind to purified transferrin in vitro in the absence of an oxidising agent. In the presence of permanganate, Mn3+ was formed and chelated by transferrin at physiological pH. In fresh serum this oxidation step may be performed by ceruloplasmin or molecular oxygen. Mn2+ was bound reversibly to alpha2-macroglobulin but this protein played no part in the oxidation of divalent manganese and had no effect on the protein binding of trivalent manganese. Manganese in the divalent state, either free as Mn2+ or bound to alpha2-macroglobulin, is removed from blood plasma very efficiently by the liver. However, the manganic-transferrin complex normally found in circulation is not rapidly removed from plasma. The liver can remove large amounts of excess manganous manganese which it presumably excretes; the small essential fraction of the manganese absorbed is oxidised to the trivalent state and bound to transferrin.
650 $aCattle
650 $aFemales
650 $aGoats
650 $aLiver
650 $aManganese
650 $aMetabolism
650 $aProtein binding
650 $aTemperature
650 $aTransferrin
650 $aCaprino
650 $aSangue
653 $aAlpha-Macroglobulins
653 $aHepatic veins
653 $aMaganes
700 1 $aDIXON, S. N.
700 1 $aHALLIS, K.
700 1 $aRUSSELL, A. M.
700 1 $aSANSOM, B. F.
700 1 $aSYMONDS, H. W.
773 $tBiochimica et Biophysica Acta$gv. 444, n. 1, p. 1-10, 1976.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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