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Journal Article

Journal article

From:
Scientific Electronic Library Online

The structures involved in latex production in rubber trees are articulated laticifers. The objective of this study was to describe anatomical aspects of the bark in four, six and eight year old non-grafted rubber plants, with the view of selecting materials of high yield potential. The analyzed material was obtained from bark cut around 1.50 m from the soil up to the xylem of the plant. The t ...

SUBJECT: hevea brasiliensis; anatomy; production; laticifers; produção

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

The objective of this work was to study the drying kinetics of four coffee berry clones Coffea canephora species dried in ground pavement and to fit different mathematical models to different experimental data selecting the one that best represents the phenomenon. Have been used coffee berry of clones: Cpafro 194, Cpafro 193, Cpafro 167 and Cpafro 180, harvested at moisture content of 1.20; 1. ...

SUBJECT: clones; teor de água; processamento; mathematical model; pós-colheita

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

A taxonomic survey regarding the filamentous desmids species was carried out made based on 109 samples collected in different phases of the hydrological cycle between the years of 2002 and 2004 in Cutiuaú lake, an black water system located in Jau National Park in the Negro river basin. A total of 15 filamentous desmids species distributed in seven genera were identified. Desmidium C. Agardh e ...

SUBJECT: região amazônica; desmídias; desmids; águas pretas; amazon region

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

The genus Actinella Lewis was studied using planktonic samples from a black water floodplain lake in Central Amazon region. For species identification the taxa were morphological and morphometricaly analyzed on base in light microscope (LM) and scanning electronic microscope (SEM). Five species were registered: Actinella brasiliensis Grunow, A. guianensis Grunow, A. gracile Kociolek, A. mirabi ...

SUBJECT: actinella; diatoms; amazônia; floodplain lakes; águas pretas

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

The objective of this work was to establish a protocol for in vitro regeneration of rosewood (Aniba rosaeodora Ducke), using apical and nodal segments inoculated in culture medium with various concentrations of growth regulators. Explants disinfected with solutions of benomyl (4,0 g.L-1) for 24 hours and sodium hipoclorite in 20% + tween 20 for 20 minutes were submitted in an experiment of sho ...

SUBJECT: growth regulators; aniba rosaeodora ducke; reguladores de crescimento; regeneração in vitro; in vitro regeneration

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

The objective of this work was to determine the physiological and sanitary quality of Senna multijugaseeds related to the methods of dormancy overcoming and the influence on the seedlings quality. The seeds had been submitted to the following methods :immersion in water fervent, the seeds had been immersed in water, at 100°C, until cooling for 24 hours; acid escarification, where the seeds had ...

SUBJECT: forest species; substrato; fotoperíodo; fungi; light

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

Secondary vegetation has many relevant functions to the ecosystems such as atmospheric carbon fixation , maintenance of biodiversity, establishment of connectivity among forest remnants, maintenance of hydrological regime, and restoration of soil fertility. The objective of this work is to estimate the area occupied by secondary vegetation in the Brazilian Legal Amazon (BLA) for 2006 using a s ...

SUBJECT: dinâmica de uso e cobertura da terra; geoprocessing; secondary vegetation; land use dynamic; sensoriamento remoto

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

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Scientific Electronic Library Online

This research was developed to evaluate the potential use of the woods Schizolobium amazonicum (Paricá) and Cecropia hololeuca (Embaúba) for manufacturing particleboard. Were made panels with the densities of 0.70 g/cm³, using mixtures of urea-formaldehyde resin and wood particles of Paricá and Embaúba, in proportions of 75, 50 and 25%. The Pinus taeda wood was used as the reference. The panel ...

SUBJECT: embaúba; paricá; particleboard; aglomerados

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

Knowledge of nutritional requirements of the species and their answers to correcting the substratum is fundamental for the production of quality seedlings. In this work, we aimed to evaluate the effect of different limestone types and the correction of Ca and Mg deficiency on the development of angelim-pedra (Dinizia excelsa) seedlings, under glasshouse conditions. We tested three types of lim ...

SUBJECT: dinizia excelsa; calagem; liming; seedling formation; produção de mudas

POSTED TO: Acta Amazonica [0044-5967]

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Journal Article

Journal article

From:
Scientific Electronic Library Online

The Amazon rainforest stretches across more than six million square kilometers and nine countries. Of the original forest area it is thought that 18 per cent has been cleared, mainly for farming purposes. In Brazil, the main drivers of deforestation are beef ranching and soya production that together occupy more than 75 per cent of newly deforested land. The situation in the Amazon illustrates ...

SUBJECT: globalização; mídia; development; desmatamento; amazon rainforest

POSTED TO: Acta Amazonica [0044-5967]

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