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| Registros recuperados: 25 | |
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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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| 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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| 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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| MORAES, V. H. F.; CONCEIÇÃO, H. E. O. da. |
| Testou-se uma nova concepção de preparo do cernambi virgem prensado (CVP), que se verificou, posteriormente, guardar semelhança com o preparo dos antigos slabs do Extremo-Oriente. Como critério básico para orientar o trabalho, adotou-se o princípio de que o método a ser desenvolvido deveria ser suficientemente simples, de fácil manejo, e reduzir ao mínimo as necessidades de insumos físicos não disponíveis localmente. Assim, foram descartadas, por exemplo, as alternativas a base de adição de produtos químicos comerciais incorporados ao látex por ocasião da sangria. |
| Tipo: Folhetos |
Palavras-chave: Cernanbi virgem prensado; CVP; Brasil; Amazonas; Production; Borracha; Hevea Brasiliensis; Latex; Produção; Seringueira; Rubber. |
| Ano: 1978 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665332 |
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| Registros recuperados: 25 | |
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