Consulta: subjectFacets:"Microcystis"
Registros recuperados: 8
Data/hora: 03/06/2024 03:07:05

Physiological and Metabolic Responses of Freshwater and Brackish-Water Strains of   Microcystis aeruginosa   Acclimated to a Salinity Gradient: Insight into Salt Tolerance
Provedor de dados: 5
Autores: Georges Des Aulnois, Maxime; Roux, Pauline; Caruana, Amandine; Réveillon, Damien; Briand, Enora; Hervé, Fabienne; Savar, Veronique; Bormans, Myriam; Amzil, Zouher; Atomi, Haruyuki.
Proliferation of microcystin (MC)-producing Microcystis aeruginosa in brackish waters has been described in several locations and represents a new concern for public and environmental health. While the impact of a sudden salinity increase on M. aeruginosa physiology has been studied, less is known about the mechanisms involved in salt tolerance after acclimation. This study aims to compare the physiological responses of two strains of M. aeruginosa (PCC 7820 and PCC 7806), which were isolated from contrasted environments, to increasing salinities. After acclimation, growth and MC production rates were determined and metabolomic analyses were conducted. For both strains, salinity decreased the biovolume, growth, and MC production rates and induced the...
Tipo: Text
Palavras-chave: Acclimation; Metabolomic; Microcystis; Salinity; Sucrose; Trehalose; Ecophysiology.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70031/68012.pdf

Some limnological characteristics of the lower Sondu-Miriu River, Kenya
Provedor de dados: 20
Autores: Mwashote, B.M.; Shimbira, W.
Chemical and physical investigations of water on a 10 km section of     the Sondu-Miriu river in Kenya were conducted in 1988-1990. They     revealed no significant spatial variation between three sampling     stations. Variation existed between the waters of a floodpool and the     river. Flooding had a general diluting effect on the nutrients. All     the physical and chemical parameters investigated were within     tolerable limits of water quality according to WHO criteria for     drinking water, fisheries and other aquatic life. A total of 22     phytoplankton and 9 zooplankton genera were recorded. The algae     Microcystis (cyanobacteria) and Navicula (diatom) were dominant. Mean     densities were 283 cells or colonies per ml for phytoplankters and...
Tipo: Proceedings Paper
Palavras-chave: Chemical limnology; Microcystis; Navicula Absorption spectra Physical oceanography Phytoplankton Population density Species diversity Turbidity Physical oceanography Phytoplankton Turbidity Nutrients Population density Species diversity http://aims.fao.org/aos/agrovoc/c_5830 http://aims.fao.org/aos/agrovoc/c_13344 http://aims.fao.org/aos/agrovoc/c_15043 http://aims.fao.org/aos/agrovoc/c_5274 http://aims.fao.org/aos/agrovoc/c_6112 http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1994
URL: http://hdl.handle.net/1834/1177

Preliminary studies on primary productivity in the Winam Bay of L. Victoria
Provedor de dados: 20
Autores: Kibaara, D.
In 1984, water temperature and pH in the Winam Bay fluctuated little  between the months. At any given time, the difference between surface and bottom temperature did not exceed 1.6 C. Secchi disc visibilities were persistently low during the year with a maximum value of 0.71 m. Oxygen concentrations within the water column fell sharply below 1.5m. The highest primary productivity by algae measured was 1.26g at 1200 hours. Microcystis was the most abundant algae encountered in the lake water.
Tipo: Journal Contribution
Palavras-chave: Microcystis; Africa  Victoria L. Primary production Water temperature data Oxygen Algae Primary production http://aims.fao.org/aos/agrovoc/c_34329.
Ano: 1986
URL: http://hdl.handle.net/1834/1213

Cianobactérias planctônicas de um lago artificial urbano na cidade de Goiânia, GO
Provedor de dados: 88
Autores: Nogueira,Ina de Souza; Gama Júnior,Watson Arantes; D'Alessandro,Emmanuel Bezerra.
Os criatórios de peixe do estado de Goiás são inúmeros e de intensa atividade recreativa. No entanto, estudos sobre as cianobactérias nesses ambientes são escassos, fato preocupante, uma vez que é comum notar-se intensa proliferação do fitoplâncton em pesqueiros, principalmente devido a ações antrópicas. O perigo consiste na formação de florações de espécies potencialmente tóxicas, principalmente de cianobactérias. Este trabalho visa inventariar as espécies planctônicas de cianobactérias ocorrentes em um pesqueiro (lago Jaó - um lago artificial raso) da área municipal de Goiânia (GO) (16º39'13" S-49º13'26" O). As amostragens foram realizadas nos períodos de seca (2003 a 2008) e chuva (2009), quando visualmente era evidente a ocorrência de florações. Foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphanocapsa; Dolichospermum; Microcystis; Pesqueiro.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000400011

Alimentação de Limnoperna fortunei (Dunker 1857): taxas de filtração com ênfase ao uso de Cyanobacteria- DOI: 10.4025/actascibiolsci.v26i4.1523
Provedor de dados: 3
Autores: Ruckert, Gabriela Von; CETEC; Campos, Mônica de Cassia Souza; CETEC; Rolla, Maria Edith; CETEC.
Limnoperna fortunei é uma espécie invasora na América do Sul que, devido ao seu crescimento excessivo, tornou-se um sério problema para o ambiente e para os setores usuários de água bruta. L. fortunei é um molusco filtrador que se alimenta de fitoplâncton e outras partículas suspensas. Moluscos filtradores são grandes bioacumuladores de toxinas. Desta forma, L. fortunei apresenta um potencial de bioacumulação e transferência na cadeia trófica de cianotoxinas. Neste estudo, experimentos in vitro demonstraram que L. fortunei é capaz de alimentar-se de espécies de Cyanobacteria potencialmente tóxicas, Microcystis viridis e Pseudanabaena sp. As taxas de filtração foram 17,20 e 24,52mL.mgPS-1.h-1, respectivamente, sendo similares à encontrada para a Chlorophyta...
Palavras-chave: 2.01.00.00-0    Biologia Geral Limnoperna fortunei; Espécie invasora; Taxa de filtração; Cyanobacteria; Microcystis; Pseudanabena; Selenastrum 2.01.00.00-0    Biologia Geral.
Ano: 2004
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1523

Influence of temperature and nutrient content on lipid production in freshwater microalgae cultures
Provedor de dados: 42
Autores: BOHNENBERGER,JULIANA E.; CROSSETTI,LUCIANE O.
The production of biomass by microalgae is considered a clean alternative compared to other plant crops that require large areas for cultivation and that generate environmental impacts. This study evaluated the influence of temperature and nutrients on lipid contents of cultured species of freshwater microalgae, with a view toward using these lipids for biodiesel production. Two strains of Monoraphidium contortum, a culture containing Chlorella vulgaris and Desmodesmus quadricauda and another strain of Microcystis aeruginosa were maintained in the laboratory for six days, in five culture media: modified ASM-1 (control, with high concentrations of phosphate and nitrate; phosphorus-deficient; non-limiting phosphate; nitrogen-deficient; and non-limiting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy biomass; Monoraphidium; Chlorella; Desmodesmus; Microcystis; Lipid accumulation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301239

Effects of nutritional conditions on lipid production by cyanobacteria
Provedor de dados: 42
Autores: CORDEIRO,RAQUEL S.; VAZ,IZABELA C.D.; MAGALHÃES,SÉRGIA M.S.; BARBOSA,FRANCISCO A.R.
ABSTRACT The present study evaluated the effects of the culturing media and the levels of nitrogen and phosphorus on the growth, biomass productivity and lipid production of four species of Microcystis (M. novacekii, M. aeruginosa, M panniformis and M. protocystis). The lipid extract was obtained by refluxing with dichloromethane (Soxhlet). The biomass and biomass productivity yields were maximized with ASM-1 medium treatment enriched with nitrogen and/or phosphorus (0.25-0.65 g/L and 25-50.7 mg/L d-1, respectively). The lipid extract yields from M. panniformis and M. novacekii were inversely correlated with the concentration of nitrogen and directly correlated with the concentration of phosphorus (35.8 % and 31.7 %). The lipid extract yield from M....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiesel; Culture media; Lipid extraction; Microcystis; Nitrogen and phosphorus deprivation and Stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502021

Genetic polymorphism in brazilian microcystis spp. (Cyanobacteria) toxic and non-toxic through RFLP-PCR of the cpcBA-IGS
Provedor de dados: 52
Autores: Bittencourt-Oliveira,Maria do Carmo; Cunha,Maristela Casé Costa; Moura,Ariadne do Nascimento.
The escalating occurrence of cyanobacterial toxic blooms demands a better understanding of genetic variability as an auxiliary expedient in species identification, collaborating with the monitoring of water destined to public supply. This study aimed at the unraveling of genetic polymorphism in the toxic and nontoxic strains of Microcystis (Cyanobacteria) species, isolated from diverse Brazilian localities through the RFLP-PCR technique applied to the c-phycocyanin encoding operon and its intergenic spacer (cpcBA-IGS). Eighteen strains belonging to M. aeruginosa, M. panniformis, M. protocystis and M. wesenbergii, plus two other unidentified strains, were analyzed by means of the morphological and molecular data. The molecular data constituted three groups...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; CpcBA-IGS; Genetic polymorphism; Microcystin; Microcystis; RFLP.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400014