Water is the main input used in shrimp farming, and the good quality of this natural resource is not only essential for the farmed animals' welfare, but also for a good profitability at the end of the farming process inaquaculture species. Pyroligneous extract (PE) is a yellow to reddish-brown liquid obtained from the condensation of gases produced by partial wood combustion. This compound has been used for several purposes in different areas, such as in the fertilization of various vegetable crops and in soil conditioning. The objective of the present study was to evaluate the possible benefits of the application of pyroligneous extract on water quality and its consequences on the production performance of Penaeus vannamei. Six 1.0 ha ponds were used, 3 of which were used for the application of pyroligneous extract (WPE) and the other 3 without the extract (wPE) for comparison purposes. The extract was diluted in water and applied directly to the dry soil and after a few hours of reaction the ponds were filled with water and prepared for cultivation. There was a significant difference (p<0.05) between the ponds (WPE) and (wPE) in the following water quality parameters: dissolved oxygen, pH, total alkalinity, total hardness, magnesium and silica. However, the values found
Extração de polissacarídeos sulfatados da microalga Chlorella vulgaris produzida em efluente gerado pela piscicultura Extraction of sulfated polysaccharide from microalgae Chlorella vulgaris produced in effluent generated by pisciculture
Biomassa seca da diatomácea chaetoceros gracilis em Diferentes salinidades visando a produção de biodiesel
Dry biomass of diatomacea chaetoceros gracilis inDifferent salinities aiming biodiesel production
Polissacarídeos sulfatados (PS) são polímeros complexos que têm despertado interesse na área biotecnológica. Objetivou-se extrair, fracionar e purificar os polissacarídeos sulfatados totais (PST) da microalga Chlorella vulgaris produzida a partir da biorremediação de efluente gerado pelo cultivo de tilápia do Nilo (Oreochromis niloticus). A extração enzimática foi através de cisteína 5mM, em tampão acetato de sódio 0,1 M, pH 5,0, contendo 5 mM de EDTA. Após isso, os PS foram precipitados utilizando volumes crescentes de álcool e, posteriormente, fracionados em cromatografia de troca iônica (DEAE-Sepharose) usando diferentes concentrações de NaCl. No fracionamento, foram obtidas 3 frações polissacarídicas majoritárias com atividade metacromática (0,9, 1,2 e 1,6 M). A biomassa de C. vulgaris produzida em efluente gerado pela psicultura, possui polissacarídeos sulfatados que podem ser usados na indústria.
Effect of sodium nitrate concentration on the lipid content of Chlorella vulgarisEfeito da concentração de nitrato de sódio no conteúdo lipídico de Chlorella vulgaris
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