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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/06/1995 |
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Data da última atualização: |
16/03/2009 |
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Autoria: |
FOELKEL, C. E. B. |
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Título: |
Unbleached kraft pulp properties of some the brazilian and U.S. Pines. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
1973. |
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Páginas: |
192 f. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Master of Science) - State University of New York College of Environmental Science and Forestry, Syracuse, New York. |
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Conteúdo: |
The purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear strength but low burst and tensile strength. However, the young Brazilian pinewoods produced pulps with relatively high tensile and burst strength. Tear strength was low for Pinus elliottii and Pinus caribaea but high for Pinus taeda. Pinus caribaea pulps had high breaking length and burst factor and required a longer beating time to achieve a given handsheet density. Thesame trend regarding beating time was observed for Araucaria angustifolia pulps. Short-fibered species produced pulps with higher percentage stretch. The main objection to use of the pulps obtained from the young thinned Brazilian woods was the low pulp yield. This important feature leads to an economic problem in using these woods for manufacturing some grades of paper. However, this work demonstrates that kraft pulps from these woods have acceptable strength properties. If wood shortages become more severe, they may be used. The two American southern pine species which were studied gave very strong pulps, but low yields. Comparing the two species, slash pine pulps had higher, breaking lengths and burst factors, while loblolly pine pulps showed higher tear strength and were more easily refined. The effect of K Number on properties and interaction between species and K Number were also successfuly isolated and anlyzed. For all species, pulp yields, beating time and burst factor increased signicantly as a consequece of the increase in the K Number in the ranges which were studied, but the tear factor decreased. Among the Brazilian raw materials, significant effects of interaction between species and K Number were found for total yield (percent of oven- dry wood), beating time and breaking length. For the American woods , these effects were reported for screened yield (percent of oven-dry wood), breaking length and burst factor. MenosThe purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear streng... Mostrar Tudo |
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Palavras-Chave: |
Propriedade. |
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Thesagro: |
Polpa. |
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Thesaurus Nal: |
Pinus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03841nam a2200169 a 4500
001 1305513
005 2009-03-16
008 1973 bl uuuu m 00u1 u #d
100 1 $aFOELKEL, C. E. B.
245 $aUnbleached kraft pulp properties of some the brazilian and U.S. Pines.
260 $a1973.$c1973
300 $a192 f.
500 $aThesis (Master of Science) - State University of New York College of Environmental Science and Forestry, Syracuse, New York.
520 $aThe purpose of this work was to compare wood characteristics and properties of the pulps obtained from several wood species, four of them growing in Brazil and two in the U.S.A. The four Brazilian pulp woods, namely Araucaria angustifolia, Pinus elliottii var. elliottii, Pinus taeda and Pinus caribaea var. hondurensis, were sampled, analyzed, pulped and tested in that country. The two American pulpwoods, Pinus elliottii var. elliottii (slash pine) and Pinus taeda (loblolly pine) studied in the U.S.A. Fiber measurements, chemical analyses and specific gravity determinations were performed on all samples. The three species of The three species of the genus Pinus from Brazil were young thinned woods and had a large juvenile wood component. The woods were pulped by the kraft process to two different intervals of permanganate number: 16 to 18 and 25 to 30. The objective was to compare pulps of equivalent lignin contents in each interval. The young Brazilian pinewoods were characterized by short fibers, low specific gravity and cellulose content, and high pentosan content. Araucaria angustifolia turned out to have long thick-walled fibers, high specifc gravity and cellulose content, and some what low alcohol benzene solubility and lignin content. The wood of the American slsh pine had longer and thicker-walled fibers, higher specific gravity and lower pentosan content when compared to the wood of loblolly pine. The pulps obtained from Araucaria angustifolia showed high tear strength but low burst and tensile strength. However, the young Brazilian pinewoods produced pulps with relatively high tensile and burst strength. Tear strength was low for Pinus elliottii and Pinus caribaea but high for Pinus taeda. Pinus caribaea pulps had high breaking length and burst factor and required a longer beating time to achieve a given handsheet density. Thesame trend regarding beating time was observed for Araucaria angustifolia pulps. Short-fibered species produced pulps with higher percentage stretch. The main objection to use of the pulps obtained from the young thinned Brazilian woods was the low pulp yield. This important feature leads to an economic problem in using these woods for manufacturing some grades of paper. However, this work demonstrates that kraft pulps from these woods have acceptable strength properties. If wood shortages become more severe, they may be used. The two American southern pine species which were studied gave very strong pulps, but low yields. Comparing the two species, slash pine pulps had higher, breaking lengths and burst factors, while loblolly pine pulps showed higher tear strength and were more easily refined. The effect of K Number on properties and interaction between species and K Number were also successfuly isolated and anlyzed. For all species, pulp yields, beating time and burst factor increased signicantly as a consequece of the increase in the K Number in the ranges which were studied, but the tear factor decreased. Among the Brazilian raw materials, significant effects of interaction between species and K Number were found for total yield (percent of oven- dry wood), beating time and breaking length. For the American woods , these effects were reported for screened yield (percent of oven-dry wood), breaking length and burst factor.
650 $aPinus
650 $aPolpa
653 $aPropriedade
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
05/01/2005 |
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Data da última atualização: |
25/09/2019 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
VASCONCELOS, V. R. de; BARROS, N. N.; LOBO, R. N. B. |
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Afiliação: |
Vânia Rodrigues de Vasconcelos, CNPC; Nelson Nogueira Barros, CNPC; CNPC. |
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Título: |
Características de crescimento de cordeiros para produção de carne no Nordeste brasileiro. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e segurança alimentar: anais. Campo Grande: Sociedade Brasileira de Zootecnia; Embrapa Gado de Corte, 2004. 6 f. 1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
Analisaram-se as características de crescimento de 303 crias ovinas referentes aos grupos genéticos ½ sangue Somalis Brasileira x Sem Raça definida (SRD) e ½ sangue Santa Inês x SRD, do nascimento aos 140 dias de idade. Durante a época chuvosa, as crias foram mantidas em pastagem nativa e receberam suplementação mineral. Na época seca, foram submetidas a amamentação controlada e creep feeding com forragem e concentrado dos 15 dias de idade até o desmame, o qual ocorreu entre 70 e 84 dias de idade. Os resultados demonstraram que o grupo genético e o ano de nascimento das crias não influenciaram (P>O,05) nenhuma das características estudadas. O mês de nascimento influenciou (P<0,05) os pesos ao nascer, aos 56 dias de idade e ao desmame, bem como, o ganho em peso ao desmame. Não houve influência sobre os pesos aos 112 e 140 dias de idade e nos ganhos em peso do nascimento aos 140 dias e do desmame aos 140 dias de idade. O melhor mês para nascimento de cordeiros foi fevereiro. Animais de nascimentos simples pesaram mais e ganharam mais peso (P<0,05) que os de nascimento múltiplos, em todas as idades e intervalos de ganhos estudados, exceto no período compreendido entre o desmame e a idade de 140 dias. Os machos foram mais pesados e ganharam mais peso que as fêmeas (P<0,05), tanto no período de cria como no pós-desmame. |
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Palavras-Chave: |
Amamentação controlada; Crossbreeding; Cruzamento industrial; Ovino de corte; Santa Inês; SRD. |
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Thesagro: |
Aleitamento; Cordeiro; Ganho de peso; Produção de carne. |
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Thesaurus NAL: |
creep feeding; Lambs; Meat; Sheep; Suckling; Weight gain. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/49620/1/AAC-Caracteristicas-de-crescimento-cordeiros.pdf
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Marc: |
LEADER 02447nam a2200325 a 4500
001 1530884
005 2019-09-25
008 2004 bl uuuu u00u1 u #d
100 1 $aVASCONCELOS, V. R. de
245 $aCaracterísticas de crescimento de cordeiros para produção de carne no Nordeste brasileiro.$h[electronic resource]
260 $aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 41., 2004, Campo Grande, MS. A produção animal e segurança alimentar: anais. Campo Grande: Sociedade Brasileira de Zootecnia; Embrapa Gado de Corte, 2004. 6 f. 1 CD-ROM.$c2004
520 $aAnalisaram-se as características de crescimento de 303 crias ovinas referentes aos grupos genéticos ½ sangue Somalis Brasileira x Sem Raça definida (SRD) e ½ sangue Santa Inês x SRD, do nascimento aos 140 dias de idade. Durante a época chuvosa, as crias foram mantidas em pastagem nativa e receberam suplementação mineral. Na época seca, foram submetidas a amamentação controlada e creep feeding com forragem e concentrado dos 15 dias de idade até o desmame, o qual ocorreu entre 70 e 84 dias de idade. Os resultados demonstraram que o grupo genético e o ano de nascimento das crias não influenciaram (P>O,05) nenhuma das características estudadas. O mês de nascimento influenciou (P<0,05) os pesos ao nascer, aos 56 dias de idade e ao desmame, bem como, o ganho em peso ao desmame. Não houve influência sobre os pesos aos 112 e 140 dias de idade e nos ganhos em peso do nascimento aos 140 dias e do desmame aos 140 dias de idade. O melhor mês para nascimento de cordeiros foi fevereiro. Animais de nascimentos simples pesaram mais e ganharam mais peso (P<0,05) que os de nascimento múltiplos, em todas as idades e intervalos de ganhos estudados, exceto no período compreendido entre o desmame e a idade de 140 dias. Os machos foram mais pesados e ganharam mais peso que as fêmeas (P<0,05), tanto no período de cria como no pós-desmame.
650 $acreep feeding
650 $aLambs
650 $aMeat
650 $aSheep
650 $aSuckling
650 $aWeight gain
650 $aAleitamento
650 $aCordeiro
650 $aGanho de peso
650 $aProdução de carne
653 $aAmamentação controlada
653 $aCrossbreeding
653 $aCruzamento industrial
653 $aOvino de corte
653 $aSanta Inês
653 $aSRD
700 1 $aBARROS, N. N.
700 1 $aLOBO, R. N. B.
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Embrapa Caprinos e Ovinos (CNPC) |
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