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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
22/09/2021 |
Data da última atualização: |
22/09/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
CASTRO, T. da C.; CARVALHO, J. O. P. de; SCHWARTZ, G.; SILVA, J. N. M.; RUSCHEL, A. R.; FREITAS, L. J. M. de; GOMES, J. M.; PINTO, R. de S. |
Afiliação: |
TATIANA DA CUNHA CASTRO, UFPA; JOÃO OLEGÁRIO PEREIRA DE CARVALHO, UFRA; GUSTAVO SCHWARTZ, CPATU; JOSÉ NATALINO MACEDO SILVA, UFRA; ADEMIR ROBERTO RUSCHEL, CPATU; LUCAS JOSE MAZZEI DE FREITAS, CPATU; JAQUELINE MACEDO GOMES, UNITINS; ROSEANE DE SIQUEIRA PINTO, UFRA. |
Título: |
The continuous timber production over cutting cycles in the Brazilian Amazon depends on volumes of species not harvested in previous cuts. |
Ano de publicação: |
2021 |
Fonte/Imprenta: |
Forest Ecology and Management, v. 490, 119124, 2021. |
DOI: |
10.1016/j.foreco.2021.119124 |
Idioma: |
Inglês |
Conteúdo: |
Can heavily logged Amazonian dense forests produce commercial timber for a second harvest under a 25?35-year cutting cycle? To address this question, we evaluated the forest capacity to recover the volume extracted 32 years after heavy logging (90 m3 ha?1) in a 144-ha research area located in the Tapajós National Forest, Brazil (03°18?31? to 03°19?21? S; 54°56?28? to 54°56?15? W). Abundance (number of trees ha?1), basal area (m2 ha?1) and volume (m3 ha?1) were assessed in two censuses, one year before logging (1981) and 32 years after logging (2014) to evaluate the status of the timber stock. Canopy openings caused by logging and silvicultural treatments increased sunlight in the forest and boosted the growth of trees 5?45 cm in DBH. Light-demanding species accounted for most of the increase in density and timber volume in the study area after logging. Our findings indicated that 32 years after the first cut, the forest was not able to replace the volume extracted. Considering the present Brazilian forest management regulations, which allow a logging intensity of 30 m3 ha?1 in a 35-year cutting cycle, this volume could only be harvested if new species not logged in the first cut were included in the new species logging list. |
Palavras-Chave: |
Annual allowable cut; Second cut; Timber yields. |
Thesagro: |
Madeira. |
Thesaurus Nal: |
Amazonia. |
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/226315/1/1-s2.0-S0378112721002127-main.pdf
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Marc: |
LEADER 02110naa a2200277 a 4500 001 2134706 005 2021-09-22 008 2021 bl uuuu u00u1 u #d 024 7 $a10.1016/j.foreco.2021.119124$2DOI 100 1 $aCASTRO, T. da C. 245 $aThe continuous timber production over cutting cycles in the Brazilian Amazon depends on volumes of species not harvested in previous cuts.$h[electronic resource] 260 $c2021 520 $aCan heavily logged Amazonian dense forests produce commercial timber for a second harvest under a 25?35-year cutting cycle? To address this question, we evaluated the forest capacity to recover the volume extracted 32 years after heavy logging (90 m3 ha?1) in a 144-ha research area located in the Tapajós National Forest, Brazil (03°18?31? to 03°19?21? S; 54°56?28? to 54°56?15? W). Abundance (number of trees ha?1), basal area (m2 ha?1) and volume (m3 ha?1) were assessed in two censuses, one year before logging (1981) and 32 years after logging (2014) to evaluate the status of the timber stock. Canopy openings caused by logging and silvicultural treatments increased sunlight in the forest and boosted the growth of trees 5?45 cm in DBH. Light-demanding species accounted for most of the increase in density and timber volume in the study area after logging. Our findings indicated that 32 years after the first cut, the forest was not able to replace the volume extracted. Considering the present Brazilian forest management regulations, which allow a logging intensity of 30 m3 ha?1 in a 35-year cutting cycle, this volume could only be harvested if new species not logged in the first cut were included in the new species logging list. 650 $aAmazonia 650 $aMadeira 653 $aAnnual allowable cut 653 $aSecond cut 653 $aTimber yields 700 1 $aCARVALHO, J. O. P. de 700 1 $aSCHWARTZ, G. 700 1 $aSILVA, J. N. M. 700 1 $aRUSCHEL, A. R. 700 1 $aFREITAS, L. J. M. de 700 1 $aGOMES, J. M. 700 1 $aPINTO, R. de S. 773 $tForest Ecology and Management$gv. 490, 119124, 2021.
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Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
Biblioteca(s): |
Embrapa Agroenergia. |
Data corrente: |
05/11/2020 |
Data da última atualização: |
06/11/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
LIMA, R. A. T.; OLIVEIRA, G. d.; SOUZA, A. A.; LOPES, F. A. C.; SANTANA, R. H.; ISTVAN, P.; QUIRINO, B. F.; BARBOSA, J.; FREITAS, S. d.; GARAY, A. V.; KRUGER, R. H. |
Afiliação: |
Raul Alcântara Teixeira Lima, Universidade de Brasília; Gideane de Oliveira, Universidade de Brasília; Amanda Araújo Souza, Universidade de Brasília; Fabyano Alvares Cardoso Lopes, Universidade Federal do Tocantins; Renata Henrique Santana, Instituto Federal de Brasília; Paula Istvan, Universidade de Brasília; BETANIA FERRAZ QUIRINO, CNPAE; João Barbosa, Universidade de Brasília; Sônia de Freitas, Universidade de Brasília; Aisel Valle Garay, Universidade de Brasília; Ricardo Henrique Kruger, Universidade de Brasília. |
Título: |
Functional and structural characterization of a novel GH3 Beta-glucosidase from the gut metagenome of the Brazilian Cerrado termite Syntermes wheeleri. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
International Journal of Biological Macromolecules, v. 165, Part A, p. 822-834, Dec. 2020. |
Volume: |
165 |
DOI: |
https://doi.org/10.1016/j.ijbiomac.2020.09.236 |
Idioma: |
Inglês |
Conteúdo: |
In this study, a GH3 family Beta-glucosidase (Bgl7226) from metagenomic sequences of the Syntermes wheeleri gut, a Brazilian Cerrado termite, was expressed, purified and characterized. The enzyme showed two optimum pHs (pH 7 and pH 10), and a maximum optimum temperature of about 40 °C using 4-Nitrophenyl ?-D-glucopyranoside (pNPG) as substrate. Bgl7226 showed higher enzymatic activity at basic pH, but higher affinity (Km) at neutral pH. However, at neutral pH the Bgl7226 enzyme showed higher catalytic efficiency (kcat/Km) for pNPG substrate. Predictive analysis about the enzyme structure-function relationship by sequence alignment suggested the presence of multi-domains and conserved catalytic sites. Circular dichroism results showed that the secondary structure composition of the enzyme is pH-dependent. Small conformational changes occurred close to the optimum temperature of 40 o C, and seem important for the highest activity of Bgl7226 observed at pH 7 and 10. In addition, the small transition in the unfolding curves close to 40 o C is typical of intermediates associated with proteins structured in several domains. Bgl7226 has significant Beta-glucosidase activity which could be attractive for biotechnological applications, such as plant roots detoxification; specifically, our group is interested in cassava roots (Manihot esculenta) detoxification. |
Palavras-Chave: |
Genômica ambiental. |
Thesagro: |
Cerrado; Enzima; RNA. |
Thesaurus NAL: |
Beta-glucosidase; Metagenomics. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02436naa a2200349 a 4500 001 2126334 005 2020-11-06 008 2020 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.ijbiomac.2020.09.236$2DOI 100 1 $aLIMA, R. A. T. 245 $aFunctional and structural characterization of a novel GH3 Beta-glucosidase from the gut metagenome of the Brazilian Cerrado termite Syntermes wheeleri.$h[electronic resource] 260 $c2020 300 $a165 490 $v165 520 $aIn this study, a GH3 family Beta-glucosidase (Bgl7226) from metagenomic sequences of the Syntermes wheeleri gut, a Brazilian Cerrado termite, was expressed, purified and characterized. The enzyme showed two optimum pHs (pH 7 and pH 10), and a maximum optimum temperature of about 40 °C using 4-Nitrophenyl ?-D-glucopyranoside (pNPG) as substrate. Bgl7226 showed higher enzymatic activity at basic pH, but higher affinity (Km) at neutral pH. However, at neutral pH the Bgl7226 enzyme showed higher catalytic efficiency (kcat/Km) for pNPG substrate. Predictive analysis about the enzyme structure-function relationship by sequence alignment suggested the presence of multi-domains and conserved catalytic sites. Circular dichroism results showed that the secondary structure composition of the enzyme is pH-dependent. Small conformational changes occurred close to the optimum temperature of 40 o C, and seem important for the highest activity of Bgl7226 observed at pH 7 and 10. In addition, the small transition in the unfolding curves close to 40 o C is typical of intermediates associated with proteins structured in several domains. Bgl7226 has significant Beta-glucosidase activity which could be attractive for biotechnological applications, such as plant roots detoxification; specifically, our group is interested in cassava roots (Manihot esculenta) detoxification. 650 $aBeta-glucosidase 650 $aMetagenomics 650 $aCerrado 650 $aEnzima 650 $aRNA 653 $aGenômica ambiental 700 1 $aOLIVEIRA, G. d. 700 1 $aSOUZA, A. A. 700 1 $aLOPES, F. A. C. 700 1 $aSANTANA, R. H. 700 1 $aISTVAN, P. 700 1 $aQUIRINO, B. F. 700 1 $aBARBOSA, J. 700 1 $aFREITAS, S. d. 700 1 $aGARAY, A. V. 700 1 $aKRUGER, R. H. 773 $tInternational Journal of Biological Macromolecules$gv. 165, Part A, p. 822-834, Dec. 2020.
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