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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
28/08/1995 |
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Data da última atualização: |
21/08/2013 |
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Autoria: |
BAKER, T. L.; QUICKE, G. V.; BENTLEY, O. G.; JOHSON, R. R.; MOXON, A. L. |
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Título: |
The influence of certain physical properties of purified celluloses and forage celluloses on their digestibility by rumen microorganisms in vitro. |
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Ano de publicação: |
1955 |
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Fonte/Imprenta: |
Journal of Animal Science, v.18, n.112, p.655-662, 1955. |
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Idioma: |
Inglês |
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Conteúdo: |
The susceptibility of purified cellulose to attack by rumen microorganisms in vitro is influenced by the source or the method of preparation. Cotton linters, a native fiber, which is known to be higly crystalline was diggested at a slower rate than samples of isolated wood celluloses. This difference was not due to particle size or to the average mass of the glucose chains making up the fibril expressed as degree of polymerization. Examination of the samples with an X-ray diffractomer revealed differences in the height-width ratio of the main peaks of the X-ray patterns. This ratio was found to be correlated with the digestibility of the sample. Indeed, it is suggested that this parameter may be a crude estimation of degree of packing perfection. In any case it would appear that this parameter was indicative of a relationship between the susceptibility of cellulose to mirobial digestion and the physical characteristics responsible for the X-ray diffraction patterns obtained. Furthermore this observation would suggest that the activity of cellulases from rumen organisms are affected by cellulose structure in much the same manner as the cellulases isolated from molds and soil organisms which attack cellulose in cloth or cellulose present in soil residue. Forages of varying cellulose digestibility (in vitro) and isolated forage holocellulose were examined by the same X-ray procedure. No differences were detected in the X-ray patterns and the results suggested that these cellulose were more amorphus than the purified isilated celluloses. It appears that native cellulose as present in forage plants should be readily digested if contact is made between them and the rumen organisms or microbial cellulases. MenosThe susceptibility of purified cellulose to attack by rumen microorganisms in vitro is influenced by the source or the method of preparation. Cotton linters, a native fiber, which is known to be higly crystalline was diggested at a slower rate than samples of isolated wood celluloses. This difference was not due to particle size or to the average mass of the glucose chains making up the fibril expressed as degree of polymerization. Examination of the samples with an X-ray diffractomer revealed differences in the height-width ratio of the main peaks of the X-ray patterns. This ratio was found to be correlated with the digestibility of the sample. Indeed, it is suggested that this parameter may be a crude estimation of degree of packing perfection. In any case it would appear that this parameter was indicative of a relationship between the susceptibility of cellulose to mirobial digestion and the physical characteristics responsible for the X-ray diffraction patterns obtained. Furthermore this observation would suggest that the activity of cellulases from rumen organisms are affected by cellulose structure in much the same manner as the cellulases isolated from molds and soil organisms which attack cellulose in cloth or cellulose present in soil residue. Forages of varying cellulose digestibility (in vitro) and isolated forage holocellulose were examined by the same X-ray procedure. No differences were detected in the X-ray patterns and the results suggested that these cellul... Mostrar Tudo |
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Palavras-Chave: |
Digestibiliy; Microorganismo. |
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Thesagro: |
Celulose; Digestibilidade; Rúmen. |
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Thesaurus Nal: |
cellulose; microorganisms. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02471naa a2200253 a 4500
001 1785897
005 2013-08-21
008 1955 bl --- 0-- u #d
100 1 $aBAKER, T. L.
245 $aThe influence of certain physical properties of purified celluloses and forage celluloses on their digestibility by rumen microorganisms in vitro.
260 $c1955
520 $aThe susceptibility of purified cellulose to attack by rumen microorganisms in vitro is influenced by the source or the method of preparation. Cotton linters, a native fiber, which is known to be higly crystalline was diggested at a slower rate than samples of isolated wood celluloses. This difference was not due to particle size or to the average mass of the glucose chains making up the fibril expressed as degree of polymerization. Examination of the samples with an X-ray diffractomer revealed differences in the height-width ratio of the main peaks of the X-ray patterns. This ratio was found to be correlated with the digestibility of the sample. Indeed, it is suggested that this parameter may be a crude estimation of degree of packing perfection. In any case it would appear that this parameter was indicative of a relationship between the susceptibility of cellulose to mirobial digestion and the physical characteristics responsible for the X-ray diffraction patterns obtained. Furthermore this observation would suggest that the activity of cellulases from rumen organisms are affected by cellulose structure in much the same manner as the cellulases isolated from molds and soil organisms which attack cellulose in cloth or cellulose present in soil residue. Forages of varying cellulose digestibility (in vitro) and isolated forage holocellulose were examined by the same X-ray procedure. No differences were detected in the X-ray patterns and the results suggested that these cellulose were more amorphus than the purified isilated celluloses. It appears that native cellulose as present in forage plants should be readily digested if contact is made between them and the rumen organisms or microbial cellulases.
650 $acellulose
650 $amicroorganisms
650 $aCelulose
650 $aDigestibilidade
650 $aRúmen
653 $aDigestibiliy
653 $aMicroorganismo
700 1 $aQUICKE, G. V.
700 1 $aBENTLEY, O. G.
700 1 $aJOHSON, R. R.
700 1 $aMOXON, A. L.
773 $tJournal of Animal Science$gv.18, n.112, p.655-662, 1955.
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Embrapa Pantanal (CPAP) |
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