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Registros recuperados: 16 | |
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Abomohra,Abo El-Fatah; El-Shouny,Wagih; Sharaf,Mona; Abo-Eleneen,Mai. |
This work aimed to study the influence of gamma radiation on the growth and production of some active substances of Arthrospira platensis. Biomass production was significantly inhibited (p ≤ 0.05) by 21 and 34%, with respect to the control at 2.0 and 2.5 kGy, respectively. Chlorophyll-a content showed 11% reduction at 2.5 kGy compared to the control. As a result of growth and Chl-a inhibition, chlorophyll productivity recorded a continuous significant decrease below the control in the cells exposed to 1, 1.5, 2 and 2.5 kGy by 8, 12, 15 and 25%, respectively after 15 days of incubation. In addition, phycobillins productivity showed significant decrease by 10 and 36% below the control at 2 and 2.5 kGy of gamma radiation, respectively. Protein production... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arthrospira platensis; Spirulina platensis; Gamma radiation; Metabolic activity; Nutritional value. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100409 |
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Danesi,Eliane Dalva Godoy; Rangel-Yagui,Carlota Oliveira; Sato,Sunao; Carvalho,João Carlos Monteiro de. |
The effects of light intensity and temperature in S. platensis cultivation with potassium nitrate or urea as nitrogen source were investigated, as well as the biomass chlorophyll contents of this cyanobacteria, through the Response Surface Methodology. Experiments were performed at temperatures from 25 to 34.5ºC and light intensities from 15 to 69 µmol photons m-2 s-1, in mineral medium. In cultivations with both sources of nitrogen, KNO3 and urea, statistic evaluation through multiple regression, no interactions of such independent variables were detected in the results of the dependent variables maximum cell concentration, chlorophyll biomass contents, cell and chlorophyll productivities, as well as in the nitrogen-cell conversion factor. In cultivation... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spirulina platensis; Light intensity; Temperature; Nitrogen sources; Chlorophyll. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100046 |
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Ronda,Srinivasa Reddy; Bokka,Chandra Sekhar; Ketineni,Chandrika; Rijal,Binod; Allu,Prasada Rao. |
The influence of aeration on algal growth and gamma-linolenic acid (GLA) production in a bubble column photobioreactor was investigated. Studies were performed in a 20-L reactor at different aeration rates (0.2-2.5 vvm). Static, continuous, and periodic operation of air resulted in 41.9%, 88.4%, and 108% air saturation of dissolved oxygen, for which the corresponding values of GLA were 2.3, 6.5, and 7.5 mg·g-1 dry cell weight, respectively. An increase in the aeration rate from 0.2 to 2.5 vvm enhanced both the specific growth rate and GLA content under periodic sparging in the bicarbonate medium. With a 6-fold increase in the aeration rate, the GLA content of the alga increased by 69.64% (5.6-9.5 mg· g-1 dry cell weight). In addition, the total fatty acid... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spirulina platensis; Aeration; Photobioreactor; Gamma-linolenic acid. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100002 |
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Pelizer,Lúcia Helena; Moraes,Iracema de Oliveira. |
This paper presents a method to estimate the biomass of Spirulina cultivated on solid medium with sugarcane bagasse as a support, in view of the difficulty in determining biomass concentrations in bioprocesses, particularly those conducted in semi-solid or solid media. The genus Spirulina of the family Oscillatoriaceae comprises the group of multicellular filamentous cyanobacteria (blue-green microalgae). Spirulina is used as fish feed in aquaculture, as a food supplement, a source of vitamins, pigments, antioxidants and fatty acids. Therefore, its growth parameters are extremely important in studies of the development and optimization of bioprocesses. For studies of biomass growth, Spirulina platensis was cultured on solid medium using sugarcane bagasse... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spirulina platensis; Solid state cultivation; Estimative of biomass; Sugarcane bagasse; Protein content. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300024 |
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Bertolin,Tanise Boeira Pelegrini; Costa,Jorge Alberto Vieira; Bertolin,Telma Elita; Colla,Luciane Maria; Hemkemeier,Marcelo. |
Estudou-se o cultivo da cianobactéria Spirulina platensis utilizando-se efluente sintético de suíno a fim de avaliar o crescimento das cepas LEB 52 e PARACAS dessa cianobactéria, em função da diluição do meio (0 e 50%) e da concentração de bicarbonato de sódio (0 e 3g/L). Nesta etapa foi utilizado um Planejamento Fatorial Completo 2³. Na Segunda etapa, diluiu-se o meio em 80, 50 e 20% e utilizou-se um Planejamento Fatorial Multiníveis 3¹ x 2¹. Os cultivos foram realizados a 30°C, com fotoperíodo de 12 horas. As variáveis utilizadas como resposta nas duas etapas foram a concentração máxima de biomassa e a velocidade específica máxima de crescimento, sendo os resultados avaliados mediante de Análise de Variância. Na primeira etapa, os maiores valores de... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spirulina platensis; Cianobactéria; Efluente suíno. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542005000100015 |
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Muliterno,Adriana; Mosele,Patrícia Correa; Costa,Jorge Alberto Vieira; Hemkemeier,Marcelo; Bertolin,Telma Elita; Colla,Luciane Maria. |
A Spirulina platensis tem sido estudada devido a seu alto valor protéico, digestibilidade e por apresentar quantidades significativas de ácidos graxos poliinsaturados, vitaminas, fenólicos e ficocianina, podendo ser utilizada na alimentação humana. A utilização de nutrientes de baixo custo é um fator importante na produção da cianobactéria por possibilitar a redução de custos de processo. Objetivou-se com este trabalho estudar o cultivo mixotrófico da S. platensis por meio da adição de uma fonte orgânica de carbono (glicose) em modo bateladaalimentada. Foi utilizado um Planejamento Fatorial Completo 2³ para o cultivo e as variáveis de estudo foram a concentração de glicose (0,5 gL-1 e 1,0 gL-1), a diluição do meio Zarrouk (50% e 75%) e a iluminância (1800... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomassa; Glicose; Iluminância; Mixotrófico; Spirulina platensis. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542005000600005 |
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Moraes,Iracema de Oliveira; Arruda,Regina de Oliveira Moraes; Maresca,Natália Rocha; Antunes,Aline de Oliveira; Moraes,Rodrigo de Oliveira. |
Spirulina platensis is a photoautotrophic mesophilic cyanobacterium. Its main sources of nutrients are nitrate, urea, and ammonium salts. Spirulina cultivation requires temperature, light intensity, and nutrient content control. This microalgae has been studied and used commercially due to its therapeutic and antioxidant potential. In addition, several studies have reported its ability to use CO2, its immune activity, and use as an adjuvant nutritive factor in the treatment of obesity. The objective of this study is the production of biomass of S. platensis using different rates of stirring, nitrogen source, amount of micronutrients, and luminosity. A 2(4) experimental design with the following factors: stirring (120 and 140 RPM), amount of nitrogen (1.5... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spirulina platensis; Human food; Biomass; Cyanobacteria. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000500026 |
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Дробецкая, И. В.; Минюк, Г. С.. |
Исследованы ростовые характеристики, содержание белка и фотосинтетических пигментов Spirulina (Arthrospira) platensis в зависимости от концентраций различных форм азота (N) (мочевины, нитратов, и их смесей) в питательной среде. Спирулину выращивали методом непропорционально проточной культуры в открытых бассейнах объемом 100 л при естественном освещении. В контроле (К) питательной средой служила среда Заррука, в которой содержание нитратного азота (N+5) было увеличено до 500 мг/л (2,6 г/л NaNO3 и 0,52 г/л KNO3). В вариантах эксперимента № 1-6 нитраты были полностью заменены на мочевину (NH2)2 CO в концентрациях 10, 30, 60, 100, 300 и 400 мг N-3/л. В вариантах № 7-12 источником азота служили смеси (NH2)2 CO и нитратов различного состава. Общее содержание... |
Tipo: Journal Contribution |
Palavras-chave: Spirulina platensis; Азотное питание; Мочевина; Нитраты; Рост; Продуктивность; Белок; Фотосинтетические пигменты.. |
Ano: 2004 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/706 |
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Бородина, А. В.. |
Карбонатное равновесие НСО3- + ОН-↔СО32- + Н2О в среде Заррука имеет свои особенности, определяющиеся солевым составом раствора. Переход НСО3-→СО32 (нормальные условия) начинается при рН 8,3-8,4. При повышении рН до 9,8 равновесные концентрации СО32- и НСО3- соотносятся как 1:1. Дальнейшее повышение рН (≥11,3) приводит к полному переводу гидрокарбонат-ионов в карбонат-ионы. И, наоборот, в карбонатной среде с исходным рН11,3 снижение щелочности сопровождается сдвигом равновесия в сторону гидрокарбонатов. Аналогичный переход НСО3-↔СО32 наблюдается и в культуре S. рlatensis. В двух исследованных средах скорость ассимиляции углерода носила различный характер. В гидрокарбонатной среде суточное потребление элемента с течением времени уменьшалось (от 0,15... |
Tipo: Journal Contribution |
Palavras-chave: Spirulina platensis; Среда Заррука; Карбонатное равновесие; Углеродный баланс; Carbon balance. |
Ano: 2003 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/548 |
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Hajati,H; Zaghari,M; Oliveira,HC. |
ABSTRACT This study was conducted to investigate the effects of Arthrospira platensis (Spirulina platensis, SP) on feed intake, feed conversion ratio, egg weight, hen day egg production, intestinal microflora, heat stress biomarkers, and HSP70 gene expression in laying Japanese quails (Coturnix coturnix japonica) suffering heat stress condition. A total of 250 female quails were allocated to 5 treatments, 5 replicates and 10 birds in each replicate in a completely randomized design. Experimental treatments included: 1) basal diet, 2) basal diet+ 0.03 % probiotic, 3) basal diet+ 0.1 % SP, 4) basal diet+ 0.3 % SP, 5) basal diet+ 0.5 % SP. During the last 6 days of the experiment, the quails were exposed to 8h of 34±1°C. The birds had free access to feed and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Egg production; Heat stress; HSP70 gene; Japanese quails; Spirulina platensis. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000100307 |
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Sánchez Rodríguez,Nora; Bu Wong,Margarita; Pérez-Saad,Héctor Manuel; León Rodríquez,Niurka; García Salmán,Jorge Daniel. |
INTRODUCCIÓN: Spirulina platensis es una microalga verde-azul de alto valor nutricional, la cual ha sido empleada como suplemento dietético. Varios de sus constituyentes ayudan al mantenimiento de la estructura y función de los tejidos nerviosos. OBJETIVO: determinar el efecto de esta microalga en un modelo de neuropatía axonal inducida por acrilamida, en ratones. MÉTODOS: el modelo consistió en la administración diaria de 70 mg/kg de acrilamida, por vía subcutánea, durante 3 semanas consecutivas; con la estimación del efecto neurotóxico de este compuesto mediante el registro, en los músculos de la pierna, del potencial de acción muscular compuesto, durante la estimulación supramáxima del nervio ciático. Después de finalizar las inyecciones de acrilamida,... |
Tipo: Journal article |
Palavras-chave: Acrilamida; Nervio ciático; Neuropatía axonal; Neuroregeneración; Spirulina platensis; Acrylamide; Sciatic nerve; Axonal neuropathy; Neuroregeneration; Spirulina platensis. |
Ano: 2009 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962009000100006 |
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Registros recuperados: 16 | |
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