Freshwater Microalgae
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Microalgae: Cultivation Aspects and Bioactive Compounds
Abstract Microalgae are aquatic unicellular microorganisms that can be found both in freshwater and marine systems; are capable of photosynthesis; and can grow as individual cells or associated in chains or small colonies. Microalgae cultivation has gained large momentum among researchers in the past decades due to their ability to produce value metabolites,
Braz. arch. biol. technol.. Publicado em: 13/06/2019
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2. Bryophyte and pteridophyte spores and other palynomorphs in quaternary marine sediments from Campos Basin, southeastern Brazil: Core BU-91-GL-05
This paper presents morphological descriptions and ecological data of cryptogam spores and other non-pollen palynomorphs from Quaternary sediments of Campos Basin, Rio de Janeiro, SE Brazil. The ages were derived from biostratigraphy of planktonic foraminifers and two radiocarbon dates, and suggest that sediment deposition started in the last 140,000 years B
Acta Bot. Bras.. Publicado em: 2015-06
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3. Influence of temperature and nutrient content on lipid production in freshwater microalgae cultures
A produção de biomassa energética através de microalgas é considerada uma alternativa limpa em relação a outras que demandam amplas áreas para cultivo e são geradoras de impactos ambientais. Esta pesquisa avaliou a influência da temperatura e nutrientes no teor de lipídios de culturas de espécies de microalgas de água doce, visando o uso destes
An. Acad. Bras. Ciênc.. Publicado em: 2014-09
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4. Avaliação da potencialidade de microalgas dulcícolas como fonte de matéria-prima graxa para a produção de biodiesel
In this work, the fatty acid quantity and composition of six freshwater microalgae and soybean grains was determined by direct transesterification and gas chromatography analysis. The results showed that all the freshwater microalgae species presented a higher quantity of fatty acid than soybean grain. Choricystis sp. (A) provides 115% more fatty acids per g
Quím. Nova. Publicado em: 2013
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5. Estrutura e produtividade da comunidade fitoplanctÃnica de um estuÃrio tropical (SirinhaÃm, Pernambuco, Brasil)
The estuary of SirinhaÃm river located in the district of SirinhaÃm, Southern of Pernambuco state, (8Â34â-8Â37âS e 35Â04â-35Â01âW), was evaluating aiming to catalog the phytoplankton community, estimating its productive capacity, the temporal spatial dynamics and the principal environmental variables that affect its composition. The samplings of th
Publicado em: 2009
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6. Aspectos físico-químicos e biológicos relacionados à ocorrência de Biomphalaria glabrata em focos litorâneos da esquistossomose em Pernambuco
This study analyzes the physico-chemical and biological parameters of freshwater aquatic environments in coastal areas of the State of Pernambuco, Brazil, where snail vector foci and cases of schistosomiasis have been recorded. The tests were carried out using standard methods and sediments were analyzed using the X-ray fluorescence technique. The micro-alga
Química Nova. Publicado em: 2006-10
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7. Acid phosphatase from the microalgae Selenastrum capricornutum : extraction, characterization and effect of agriculture pollutants / Fosfatase acida da microalga Selenastrum capricornutum : extração, caracterização e efeito de poluentes de origem agricola
Selenastrum capricornutum is an unicellular green algae widely distributed in freshwater and soils among the world. Because this cosmopolitan characteristic its use is recommended by national and international protocols in ecotoxicity studies. Algae acid phosphatase plays important roles in the metabolism such as decomposing organic phosphates into free phos
Publicado em: 2005
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8. O papel dos polissacarídeos algais extracelulares na dinâmica de metais no reservatório de Barra Bonita.
A influência do fitoplâncton e de seus produtos excretados resultantes da fotossíntese em corpos d água têm sido o enfoque de vários trabalhos que investigam a especiação e o destino de metais. Este estudo teve como hipótese a potencial influência dos materiais de alta massa molecular excretados por três espécies fitoplanctônicas (Anabaena spiro
Publicado em: 2004
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9. Increased Growth of the Microalga Chlorella vulgaris when Coimmobilized and Cocultured in Alginate Beads with the Plant-Growth-Promoting Bacterium Azospirillum brasilense†
Coimmobilization of the freshwater microalga Chlorella vulgaris and the plant-growth-promoting bacterium Azospirillum brasilense in small alginate beads resulted in a significantly increased growth of the microalga. Dry and fresh weight, total number of cells, size of the microalgal clusters (colonies) within the bead, number of microalgal cells per cluster,
American Society for Microbiology.
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10. Inorganic Carbon Limitation and Chemical Composition of Two Freshwater Green Microalgae †
Two freshwater chlorophytes, Chlorella vulgaris and Scenedesmus obliquus, were grown in inorganic carbon-limited continuous cultures in which HCO3− was the sole source of inorganic carbon. The response of the steady-state growth rate to the external total inorganic carbon concentration was reasonably well described by the Monod equation; however, the respo
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11. Plant and algal interference in bacterial beta-D-galactosidase and beta-D-glucuronidase assays.
Several commonly occurring freshwater and marine plants and algae were screened for beta-D-galactosidase and beta-D-glucuronidase activities by using a 60-min enzyme assay based on the hydrolysis by these enzymes of 4-methylumbelliferyl-beta-D-galactoside and 4-methylumbelliferyl- beta-glucuronide, respectively. All freshwater plant extracts tested showed be
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12. Rapid contemporary evolution and clonal food web dynamics
Character evolution that affects ecological community interactions often occurs contemporaneously with temporal changes in population size, potentially altering the very nature of those dynamics. Such eco-evolutionary processes may be most readily explored in systems with short generations and simple genetics. Asexual and cyclically parthenogenetic organisms
The Royal Society.