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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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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: |
09/01/2024 |
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Autoria: |
MANN, T. |
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Título: |
Studies on the metabolism of semen. III. Fructose as a normal constituent of seminal plasma. Site of formation and function of fructose in semen. |
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Ano de publicação: |
1946 |
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Fonte/Imprenta: |
Biochemistry Journal, v. 40, n. 3, p. 481-491, 1946. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: 1. Contrary to the views- generally held, it was found that the reducing carbohydrate of the seminal plasma is not glucose but d(-)-fructose. 2. Fructose has been purified from seminal plasma and identified by its reducing value, optical activity, preparation of methylphenyl-fructosazone, yeast-fermentation test and by other means. 3. In the seminal plasma of several species, including bull, ram, rabbit, boar and man, fructose accounts for practically the whole of the yeastfermentable reducing sugar. Little glucoge, if any, is present in the seminal plasma; this was shown by applying a method which makes use of mould glucose oxidase which oxidizes glucose qiuantitatively but leaves fructose untouched. 4. The level of fructose in seminal plasma varies from one species to another and even within the same species there are individual differences. The highest values were observed in bull where .the concentration sometimes exceeds 1 g. fructose/ 100 ml. seminal plasma. 5. Sperm obtained directly from the epididymis contains hardly any fructose. During the passage through the male generative tract the semen acquires fructose from the accessory glands of reproduction, of which the seminal vesicles are the chief contributors of fructose. In some animals which have no seminal vesicles proper, fructose is generated in the prostate. 6. The main function of fructose in semen is to supply the spermatozoa with readily glycolyzable material. On storage, the content of seminal fructose falls progressively and lactic acid accumulates. 6. The main function of fructose in semen is to supply the spermatozoa with readily glycolyzable material. On storage, the content of seminal fructose falls progressively and lactic acid accumulates. 7. Normally spermatozoa utilize fructose, as this is the chief sugar available in seminal plasma, but their enzymic equipment enables them to metabolize equally efficiently glucose and mannose. The glycolysis of these three sugars in sperm is initiated by a hexokinase interaction with adenosinetriphosphate. The monophosphohexose thus formed is further metabolized through diphosphohexose, phosphotriose, phosphoglyceric acid and pyruvic acid to lactic acid. MenosAbstract: 1. Contrary to the views- generally held, it was found that the reducing carbohydrate of the seminal plasma is not glucose but d(-)-fructose. 2. Fructose has been purified from seminal plasma and identified by its reducing value, optical activity, preparation of methylphenyl-fructosazone, yeast-fermentation test and by other means. 3. In the seminal plasma of several species, including bull, ram, rabbit, boar and man, fructose accounts for practically the whole of the yeastfermentable reducing sugar. Little glucoge, if any, is present in the seminal plasma; this was shown by applying a method which makes use of mould glucose oxidase which oxidizes glucose qiuantitatively but leaves fructose untouched. 4. The level of fructose in seminal plasma varies from one species to another and even within the same species there are individual differences. The highest values were observed in bull where .the concentration sometimes exceeds 1 g. fructose/ 100 ml. seminal plasma. 5. Sperm obtained directly from the epididymis contains hardly any fructose. During the passage through the male generative tract the semen acquires fructose from the accessory glands of reproduction, of which the seminal vesicles are the chief contributors of fructose. In some animals which have no seminal vesicles proper, fructose is generated in the prostate. 6. The main function of fructose in semen is to supply the spermatozoa with readily glycolyzable material. On storage, the content of seminal fru... Mostrar Tudo |
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Thesagro: |
Bovino; Reprodução; Sêmen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02727naa a2200157 a 4500
001 1523738
005 2024-01-09
008 1946 bl uuuu u00u1 u #d
100 1 $aMANN, T.
245 $aStudies on the metabolism of semen. III. Fructose as a normal constituent of seminal plasma. Site of formation and function of fructose in semen.$h[electronic resource]
260 $c1946
520 $aAbstract: 1. Contrary to the views- generally held, it was found that the reducing carbohydrate of the seminal plasma is not glucose but d(-)-fructose. 2. Fructose has been purified from seminal plasma and identified by its reducing value, optical activity, preparation of methylphenyl-fructosazone, yeast-fermentation test and by other means. 3. In the seminal plasma of several species, including bull, ram, rabbit, boar and man, fructose accounts for practically the whole of the yeastfermentable reducing sugar. Little glucoge, if any, is present in the seminal plasma; this was shown by applying a method which makes use of mould glucose oxidase which oxidizes glucose qiuantitatively but leaves fructose untouched. 4. The level of fructose in seminal plasma varies from one species to another and even within the same species there are individual differences. The highest values were observed in bull where .the concentration sometimes exceeds 1 g. fructose/ 100 ml. seminal plasma. 5. Sperm obtained directly from the epididymis contains hardly any fructose. During the passage through the male generative tract the semen acquires fructose from the accessory glands of reproduction, of which the seminal vesicles are the chief contributors of fructose. In some animals which have no seminal vesicles proper, fructose is generated in the prostate. 6. The main function of fructose in semen is to supply the spermatozoa with readily glycolyzable material. On storage, the content of seminal fructose falls progressively and lactic acid accumulates. 6. The main function of fructose in semen is to supply the spermatozoa with readily glycolyzable material. On storage, the content of seminal fructose falls progressively and lactic acid accumulates. 7. Normally spermatozoa utilize fructose, as this is the chief sugar available in seminal plasma, but their enzymic equipment enables them to metabolize equally efficiently glucose and mannose. The glycolysis of these three sugars in sperm is initiated by a hexokinase interaction with adenosinetriphosphate. The monophosphohexose thus formed is further metabolized through diphosphohexose, phosphotriose, phosphoglyceric acid and pyruvic acid to lactic acid.
650 $aBovino
650 $aReprodução
650 $aSêmen
773 $tBiochemistry Journal$gv. 40, n. 3, p. 481-491, 1946.
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