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| Registros recuperados: 19 | |
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| Mesquita,Alessandro Carlos; Oliveira,Luiz Edson Mota de; Mazzafera,Paulo; Delú-Filho,Nelson. |
| Rubber production is dependent on the availability of carbohydrates in the tissues engaged in latex synthesis. In this study three rubber tree clones were used to study the protein profile, the activities of invertase and sucrose synthase in the latex and anatomical characteristics of the bark, as well as to establish a possible relationship with latex production. The clones used in the study, RRIM 600, GT 1 and Fx2261, differed in latex productivity, from high to low in this order. Although present, few differences were observed in the latex protein profile obtained by denaturing electrophoresis. The activity of neutral invertase was higher than the acidic isoform, and both activities were higher in the most productive clones RRIM 600 and GT 1. The same... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hevea brasiliensis; Invertase; Lacticiferous vessels; Latex; Rubber; Sucrose synthase. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200002 |
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| SA, C. P. de; OLIVEIRA, E. L. de; NASCIMENTO, G. C. do. |
| A ocupação do Acre está relacionada ao extrativismo da borracha, atividade econômica que predominou até o início da produção da borracha de cultivo racional, oriunda dos países asiáticos. Este fato comprimiu os preços no mercado internacional, condicionante de competitividade no mercado externo, tornando inviável a exploração comercial dos seringais nativos da Amazônia. A desestruturação do frágil modelo extrativista "barracão" tornou-se inevitável, culminando com a falência da atividade que, aliada aos conflitos pela posse da terra, redundou na expulsão do seringueiro do processo produtivo. Nos últimos anos, atraído pelo incentivo da política de subsídios, observa-se o retorno do seringueiro ao seringal, crescendo o número de famílias envolvidas na... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Ruber tree; Produto florestal não madeireiro (PFNM); RESEX Chico Mendes; Amazônia Ocidental; Acre; Western Amazon; Amazonia Occidental; Xapuri; Insumos agrícolas; Productos forestales no madereros; Rentabilidad.; Análisis de costo-beneficio; Análisis económico; Produção; Rentabilidade; Heveicultura; Seringueira; Hevea; Plantio; Latex; Extração; Borracha; Insumo; Análise econômica; Análise de custo-benefício; Caucho.; Economic analysis; Profitability.; Farm inputs; Nontimber forest products; Rubber; Cost benefit analysis. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/502674 |
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| Rodrigo,V.H.L.. |
| High land productivity is a must for any commercial cultivation including Hevea brasiliensis (rubber). Also, the high demand for natural rubber has placed great pressure on expanding rubber cultivation to new and non-traditional areas. Understanding the ecophysiological principles behind the measures of productivity improvements is vital for wide application of these measures and to assess their sustainability. This review discusses the ecophysiological principles and tools used, along with the measures taken, to address productivity needs in terms of: genotype selection, determination of optimum planting density, and establishment of intercropping systems. Breeding for high yields and selection of suitable genotypes for different growing conditions are a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rubber; Genotype selection; Intercropping; Planting density; Physiology. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400002 |
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| SANTOS, J. C. dos; SILVA, M. R. da; SA, C. P. de; NASCIMENTO, G. C. do; VEIGA, S. A.. |
| A produção extrativa de látex de seringueira (Hevea brasiliensis) já representou a principal atividade econômica do Acre e continua sendo um dos principais geradores de renda para as famílias que residem nas áreas de floresta nativa do Estado. Para o setor primário, o conhecimento detalhado da composição dos custos de produção e rentabilidade de sistemas agroextrativistas constitui um importante norteador de políticas públicas, especialmente políticas de crédito rural, preços mínimos, pesquisa agropecuária, entre outras. Para sistemas extrativistas na Amazônia, são raros os estudos dessa natureza, realizados até o momento. Este trabalho tem o objetivo de apresentar uma estimativa dos custos de produção, ou custos de extração, de látex em seringal nativo... |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Ruber tree; Produto florestal não madeireiro (PFNM); Seringal Rio Branco; RESEX Chico Mendes; Xapuri (AC); Acre; Western Amazon; Amazonia Occidental; Amazônia Ocidental; Insumos agrícolas; Análisis de costo-beneficio; Productos forestales no madereros; Rentabilidad.; Análisis económico; Seringueira; Análise de custo-benefício; Rentabilidade; Heveicultura; Hevea; Latex; Extração; Borracha; Produção; Insumo; Análise econômica; Caucho.; Nontimber forest products; Economic analysis; Farm inputs; Rubber; Profitability.; Cost benefit analysis. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/503365 |
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| Deaton, Brady J.; San, Nu Nu. |
| Diversified production systems are considered important tools for stabilizing the income of smallholder rubber producers in Indonesia. Based on empirical data collected from smallholder rubber producers in the Nucleus Estate Smallholder (NES) development project, estimations were made of the economic feasibility of integrating sheep and selected crops into smallholder rubber production plantations. The dynamic optimization procedure is used as an evaluation technique. This study finds that integration of sheep and crops into smallholder rubber production is economically feasible, particularly for those who utilize family labor for hand harvesting grass and grazing sheep. Integrating sheep alone increases the net present value of future income by 20%.... |
| Tipo: Journal Article |
Palavras-chave: Bioeconomic model; Diversification; Dynamic optimization; Indonesia; Rubber; Sheep; Smallholder; Farm Management. |
| Ano: 1999 |
URL: http://purl.umn.edu/14727 |
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| Murbach,Marcos Roberto; Boaretto,Antonio Enedi; Muraoka,Takashi; Souza,Euclides Caxambu Alexandrino de. |
| Few reports have been presented on nutrient cycling in rubber tree plantations (Hevea brasiliensis Muell. Arg.). This experiment was carried out to evaluate: the effect of K rates on the amount of nutrients transfered to the soil in a 13-year old Hevea brasilensis RRIM 600 clone plantation, nutrient retranslocation from the leaves before falling to the soil, and nutrient loss by dry rubber export. The experiment started in 1998 and potassium was applied at the rates of 0, 40, 80 and 160 kg ha-1 of K2O under the crowns of 40 rubber trees of each plot. Literfall collectors, five per plot, were randomly distributed within the plots under the trees. The accumulated literfall was collected monthly during one year. The coagulated rubber latex from each plot was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litterfall; Fertilization; Nutrition; Rubber; Nutrient exportation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200021 |
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| Le Gac, Pierre-yves; Broudin, Morgane; Roux, Gérard; Verdu, Jacques; Davies, Peter; Fayolle, Bruno. |
| Tensile properties and crack propagation properties, especially critical strain energy release rate in mode I, GIC, have been used to investigate fracture properties of elastomers and their relationships with microstructure. These investigations were mainly based on a series of comparisons: first, the behaviour of polychloroprene rubber (CR), undergoing stress hardening due to strain induced crystallization (SIC) and oxidative crosslinking (OCL) was compared with that of chlorinated polyethylene (CPE), which undergoes SIC but not OCL, and with a polyurethane based on hydroxyl terminated polybutadiene (PU) which undergoes OCL but not SIC. Comparisons were also made on CR between fracture behaviour at ambient temperature, where SIC occurs and at 100°C where... |
| Tipo: Text |
Palavras-chave: Fracture; Rubber; Oxidation. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00184/29546/27872.pdf |
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| Alverga, Paula; Universidade Federal do Acre, Brazil;; Barnes, Grenville; School of Forest Resources and Conservation, University of Florida, USA; gbarnes@ufl.edu; Brasil da Silva, Izaias; Universidade Federal do Acre, Brazil;; Castro, Wendeson; Universidade Federal do Acre, Brazil;; de Souza Moll, Iracema; Universidade Federal do Acre, Brazil;; Medeiros, Herison; Universidade Federal do Acre, Brazil; medeiros.herison@gmail.com; Murphy, Skya; Department of Biology, University of Florida, USA;; Rockwell, Cara A.; School of Forest Resources and Conservation, University of Florida, USA; rockwell_cara@yahoo.com; Shenkin, Alexander; School of Forest Resources and Conservation, University of Florida, USA; Department of Biology, University of Florida, USA; ashenkin@ufl.edu; Silveira, Marcos; Universidade Federal do Acre, Brazil;; Southworth, Jane; Department of Geography and Land Use and Environmental Change Institute, University of Florida, USA; jsouthwo@geog.ufl.edu; Perz, Stephen; Department of Sociology and Criminology & Law, University of Florida, USA; sperz@soc.ufl.edu. |
| Contemporary conservation interventions must balance potential trade-offs between multiple ecosystem services. In tropical forests, much attention has focused on the extent to which carbon-based conservation provided by REDD+ policies can also mitigate biodiversity conservation. In the nearly one-third of tropical forests that are community owned or managed, conservation strategies must also balance the multiple uses of forest products that support local livelihoods. Although much discussion has focused on policy options, little empirical evidence exists to evaluate the potential for trade-offs among different tropical forest value components. We assessed multiple components of forest value, including tree diversity, carbon stocks, and both timber and... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Aç Ai; Biodiversity conservation; Brazil nut; Carbon stocks; Livelihood; NTFP; REDD; Rubber; Timber; Tropical rainforest. |
| Ano: 2014 |
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| Auntiporn Keansua; Sukumaporn Sriphadet; Jessada Phattaralerphong. |
| A study on changes in net photosynthesis (Pn), transpiration (Tr), stomatal conductance (Gs) and photosynthesis water use efficiency (WUE) of cutted rubber branch c.v. RRIM 600. Four methods included, do not put into the water, immediately put the branch into the water after cut, and put into the water after cut 5 and 10 minutes. The comparing of Pn, Tr, Gs and WUE values before and after cut were done. The result were found that Pn, Tr and Gs decrease immediately after branch was cut. The value decreased rapidly in first 15 minutes. Putting the branch into the water immediately, and putting the brance into the water 5 or and 10 minutes after cut expressed that the Pn, Tr, Gs and WUE could restored to the normal value before the branch was cut.... |
| Tipo: PhysicalObject |
Palavras-chave: Rubber; Cutted rubber branch; RRIM 600; Photosynthesis; Transpiration; Stomatal conductance; Water use efficiency; Plant physiology analysis; ยางพารา; กิ่งยางพารา; การสังเคราะห์ด้วยแสง; การตอบสนองต่อแสง; การเปิดปากใบ; การคายน้ำ; ประสิทธิภาพการใช้น้ำ; การวิเคราะห์สรีรวิทยาของพืช. |
| Ano: 2014 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5755 |
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| Registros recuperados: 19 | |
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