4,623 research outputs found

    Reproductive biology of Macrobrachium surinamicum (Decapoda: Palaemonidae) in the Amazon River mouth.

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    Macrobrachium surinamicum is an indigenous prawn distributed from the lower Amazon and Tocantins river basins to Venezuela in the Orinoco Delta region. It is common bycatch fauna of Macrobrachium amazonicumartisan fishing in the states of Pará and Amapá. The aim of this study was to investigate aspects on reproductive biology (reproductive period, size of sexual maturity population, fecundity, reproductive output and recruitment) of M. surinamicum from four important areas to artisanal prawn fishing located at the Amazon River mouth (Amapá and Pará). The specimens were captured using 20 handcrafted traps called ?matapi?. A number of 675 prawns were captured, 258 males, 409 females and eight juveniles, resulting in 1:1.6 (Male: Female) sex ratio. The reproductive peak period occurred from March to July, coinciding with the higher rainfall period. The juvenile prawn occurred only in May and July. Total length of egg-bearing females ranged from 12.12 to 38.30 mm, with mean female length at first maturity (L50) of 23.7 mm. Fecundity increased with prawn size and varied between 174 and 1780 eggs per female. Mean egg volume increased gradually from 0.031 (Stage I) to 0.060 mm³ (Stage III) during embryogenesis. Macrobrachium surinamicumdepends on brackish water to complete the larval development. Irrespective of female size, reproductive output of M. surinamicumvaried between 4.3 % and 35.5 % of their body weight for egg production. The knowledge of the reproductive biology reported in the present study is an important tool to define strategies to preserve M. surinamicumin Amazon River mouth

    Monitoramento de indicadores da qualidade de um Cambissolo sob sistemas de manejo da pecuária familiar na Serra do Sudeste, RS

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    Ponto de colheita e qualidade da uva BRS Isis sob armazenamento refrigerado seguido de temperatura ambiente.

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    Esse trabalho teve o objetivo de avaliar o ponto de colheita e a qualidade das uvas da cultivar BRS Ísis quando armazenadas sob refrigeração seguida de temperatura ambiente

    Efeitos da omissão de macro e micronutrientes no desenvolvimento de mudas de cupuaçuzeiro.

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    Publicado também: FRAZÃO, D. A. C.; HOMMA, A. K. O; VIÉGAS, I. de J. M. (Ed.). Contribuição ao desenvolvimento da fruticultura na Amazônia. Belém, PA: Embrapa Amazônia Oriental, 2006. p. 445-452

    Synthesis of Selenium-Quinone Hybrid Compounds with Potential Antitumor Activity via Rh-Catalyzed C-H Bond Activation and Click Reactions

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    In continuation of our quest for new redox-modulating catalytic antitumor molecules, selenium-containing quinone-based 1,2,3-triazoles were synthesized using rhodium-catalyzed C-H bond activation and click reactions. All compounds were evaluated against five types of cancer cell lines: HL-60 (human promyelocytic leukemia cells), HCT-116 (human colon carcinoma cells), SF295 (human glioblastoma cells), NCIH-460 (human lung cells) and PC3 (human prostate cancer cells). Some compounds showed good activity with IC50 values below 1 µM. The cytotoxic potential of the naphthoquinoidal derivatives was also evaluated in non-tumor cells, exemplified by L929 cells. Overall, these compounds represent promising new lead derivatives and stand for a new class of chalcogenium-containing derivatives with potential antitumor activity

    Teste de produtos quimicos e biologico no controle in vitro de Colletotrichum Gloeosporioides Penz., patogeno da cebola.

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    Em casa-de-vegetacao, realizou-se teste de eficiencia agronomica de produtos quimicos, selecionados em testes ?n vitro", e de um produto biologico, Trichoderma spp., na inibicao da antracnose ou mal-de-sete-voltas da cebola. Utilizou-se a cultivar Texas -, Early Grano 502, suscetivel a doenca e uma das mais cultivadas na regiao ceboleira do Vale do Sao Francisco. O delineamento experimental foi o de blocos ao acaso com 18 tratamentos, sendo duas testemunhas, recebendo duas tecnicas de aplicacao dos produtos (A -antes da inoculacao do patogeno, B -depois da inoculacao do patogeno) e tres repeticoes com seis plantas cada. As avaliacoes foram realizadas aos 10 e 15 dias de incubacao utilizando uma escala de notas, para graus de sintomas. Os resultados revelam os melhores niveis de controle em ordem decrescente de eficiencia para os produtos chlorotalonil+fentin acetato 200g/100L (Toplus ); fentin acetate 80g/100L (Hokko Suzu); benomy100g/100L (Benlate) e captan 240g/100L (Orthocide), quando no tratamento preventivo e para os produtos captan 240g/100L (Orthocide), chlorotalonil+fentin acetato 250g e 200g/100L (Toplus) e imibenconazole 100g/100L (Manage) quando no tratamento curativo.Suplemento. Edição dos Resumos do 41 Congresso Brasileiro de Olericultura e 1 Encontro sobre Plantas Medicinais Aromáticas e Condimentares, Brasília, DF, 2011
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