Base de dados : MEDLINE
Pesquisa : B01.400 [Categoria DeCS]
Referências encontradas : 354 [refinar]
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[PMID]:28951039
[Au] Autor:Tato T; Salgueiro-González N; León VM; González S; Beiras R
[Ad] Endereço:Estación de Ciencias Mariñas de Toralla (ECIMAT), Universidade de Vigo, Illa de Toralla, 36331 Vigo, Galicia, Spain; Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, Campus Lagoas-Marcosende, 36200 Vigo, Galicia, Spain.
[Ti] Título:Ecotoxicological evaluation of the risk posed by bisphenol A, triclosan, and 4-nonylphenol in coastal waters using early life stages of marine organisms (Isochrysis galbana, Mytilus galloprovincialis, Paracentrotus lividus, and Acartia clausi).
[So] Source:Environ Pollut;232:173-182, 2018 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This study assessed the environmental risk on coastal ecosystems posed by three phenolic compounds of special environmental and human health concern used in plastics and household products: bisphenol A (BPA), triclosan (TCS) and 4-nonylphenol (4-NP). These three chemicals are among the organic contaminants most frequently detected in wastewater. The most toxic compound tested was 4-NP, with 10% effective concentration at 11.1 µg L for Isochrysis galbana, 110.5 µg L for Mytilus galloprovincialis, 53.8 µg L for Paracentrotus lividus, and 29.0 µg L for Acartia clausi, followed by TCS (14.6 µg L for I. galbana, 149.8 µg L for M. galloprovincialis, 129.9 µg L for P. lividus, and 64.8 µg L for A. clausi). For all species tested, BPA was the less toxic chemical, with toxicity thresholds ranging between 400 and 1200 µg L except for A. clausi nauplii (186 µg L ). The relatively narrow range of variation in toxicity considering the broad physiological differences among the biological models used point at non-selective mechanisms of toxicity for these aromatic organics. Microalgae, the main primary producers in pelagic ecosystems, showed particularly high susceptibility to the chemicals tested. When the toxicity thresholds experimentally obtained were compared to the maximum environmental concentrations reported in coastal waters, the risk quotients obtained correspond to very low or low risk for BPA and TCS, and from low to high for 4-NP.
[Mh] Termos MeSH primário: Organismos Aquáticos/fisiologia
Compostos Benzidrílicos/toxicidade
Fenóis/toxicidade
Triclosan/toxicidade
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Animais
Copépodes
Ecotoxicologia
Monitoramento Ambiental
Haptófitas
Mytilus/efeitos dos fármacos
Paracentrotus
Plásticos
Testes de Toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzhydryl Compounds); 0 (Phenols); 0 (Plastics); 0 (Water Pollutants, Chemical); 4NM5039Y5X (Triclosan); I03GBV4WEL (4-nonylphenol); MLT3645I99 (bisphenol A)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180209
[Lr] Data última revisão:
180209
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170928
[St] Status:MEDLINE


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[PMID]:29036179
[Au] Autor:Hermoso M; Lefeuvre B; Minoletti F; de Rafélis M
[Ad] Endereço:Institut de Sciences de la Terre de Paris (UMR 7193), Sorbonne Universités, UPMC Univ Paris 06, CNRS, Paris, France.
[Ti] Título:Extreme strontium concentrations reveal specific biomineralization pathways in certain coccolithophores with implications for the Sr/Ca paleoproductivity proxy.
[So] Source:PLoS One;12(10):e0185655, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The formation of the coccolith biominerals by a group of marine algae (the Coccolithophores) offers fascinating research avenues both from the biological and geological sides. It is surprising how biomineralisation by a key phytoplanktonic group remains underconstrained, yet is influential on ocean alkalinity and responsible for the built up of our paleoclimatic archive over the last 200 Myrs. Here, we report two close relative coccolith taxa exhibiting substantial bioaccumulation of strontium: Scyphosphaera and Pontosphaera grown in the laboratory or retrieved from Pliocene sediments. This strontium enrichment relative to calcium is one order of magnitude greater than reported in other coccoliths of the orders Isochrysidales and Coccolithales, and extends well beyond established controls on Sr/Ca ratios by temperature and growth rate. We discuss this prominent vital effect in relation with possible specific uptake of strontium relative to calcium from the extracellular environment to the coccolith vesicle in coccolithophores excreting very large scale coccoliths. The report of Sr-rich biominerals challenges our current understanding of the cellular acquisition and intracellular trafficking of alkaline earth cations in phytoplanktonic calcifying eukaryotic algae. The presence of Sr-rich coccolith species in the geological record has to be quantitatively considered in future Sr/Ca-based palaeoceanographic reconstruction.
[Mh] Termos MeSH primário: Calcificação Fisiológica
Fósseis
Haptófitas/metabolismo
Estrôncio/metabolismo
[Mh] Termos MeSH secundário: Cálcio/análise
Cálcio/metabolismo
Haptófitas/química
Haptófitas/crescimento & desenvolvimento
Haptófitas/ultraestrutura
Microscopia Eletrônica de Varredura
Oceanos e Mares
Sicília
Análise Espectral
Estrôncio/análise
Temperatura Ambiente
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
SY7Q814VUP (Calcium); YZS2RPE8LE (Strontium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171017
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0185655


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[PMID]:28750008
[Au] Autor:Iglesias-Rodriguez MD; Jones BM; Blanco-Ameijeiras S; Greaves M; Huete-Ortega M; Lebrato M
[Ad] Endereço:Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA, United States of America.
[Ti] Título:Physiological responses of coccolithophores to abrupt exposure of naturally low pH deep seawater.
[So] Source:PLoS One;12(7):e0181713, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Upwelling is the process by which deep, cold, relatively high-CO2, nutrient-rich seawater rises to the sunlit surface of the ocean. This seasonal process has fueled geoengineering initiatives to fertilize the surface ocean with deep seawater to enhance productivity and thus promote the drawdown of CO2. Coccolithophores, which inhabit many upwelling regions naturally 'fertilized' by deep seawater, have been investigated in the laboratory in the context of ocean acidification to determine the extent to which nutrients and CO2 impact their physiology, but few data exist in the field except from mesocosms. Here, we used the Porcupine Abyssal Plain (north Atlantic Ocean) Observatory to retrieve seawater from depths with elevated CO2 and nutrients, mimicking geoengineering approaches. We tested the effects of abrupt natural deep seawater fertilization on the physiology and biogeochemistry of two strains of Emiliania huxleyi of known physiology. None of the strains tested underwent cell divisions when incubated in waters obtained from <1,000 m (pH = 7.99-8.08; CO2 = 373-485 p.p.m; 1.5-12 µM nitrate). However, growth was promoted in both strains when cells were incubated in seawater from ~1,000 m (pH = 7.9; CO2 ~560 p.p.m.; 14-17 µM nitrate) and ~4,800 m (pH = 7.9; CO2 ~600 p.p.m.; 21 µM nitrate). Emiliania huxleyi strain CCMP 88E showed no differences in growth rate or in cellular content or production rates of particulate organic (POC) and inorganic (PIC) carbon and cellular particulate organic nitrogen (PON) between treatments using water from 1,000 m and 4,800 m. However, despite the N:P ratio of seawater being comparable in water from ~1,000 and ~4,800 m, the PON production rates were three times lower in one incubation using water from ~1,000 m compared to values observed in water from ~4,800 m. Thus, the POC:PON ratios were threefold higher in cells that were incubated in ~1,000 m seawater. The heavily calcified strain NZEH exhibited lower growth rates and PIC production rates when incubated in water from ~4,800 m compared to ~1,000 m, while cellular PIC, POC and PON were higher in water from 4,800 m. Calcite Sr/Ca ratios increased with depth despite constant seawater Sr/Ca, indicating that upwelling changes coccolith geochemistry. Our study provides the first experimental and field trial of a geoengineering approach to test how deep seawater impacts coccolithophore physiological and biogeochemical properties. Given that coccolithophore growth was only stimulated using waters obtained from >1,000 m, artificial upwelling using shallower waters may not be a suitable approach for promoting carbon sequestration for some locations and assemblages, and should therefore be investigated on a site-by-site basis.
[Mh] Termos MeSH primário: Haptófitas/fisiologia
[Mh] Termos MeSH secundário: Adaptação Fisiológica
Dióxido de Carbono/química
Concentração de Íons de Hidrogênio
Água do Mar/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181713


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[PMID]:28692685
[Au] Autor:Luxem KE; Ellwood MJ; Strzepek RF
[Ad] Endereço:Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, United States of America.
[Ti] Título:Intraspecific variability in Phaeocystis antarctica's response to iron and light stress.
[So] Source:PLoS One;12(7):e0179751, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species' success, but there have been hints that this ability differs among clones. Here, we compare the growth, cell size and chlorophyll a concentrations of four P. antarctica clones cultured under different iron and light conditions. Iron was provided either as unchelated iron (Fe') or bound to the bacterial siderophore desferrioxamine B, representing, respectively, the most and least bioavailable forms of iron which phytoplankton encounter in the marine environment. The growth rate data demonstrate that the clones vary in their ability to grow using organically bound iron, and that this ability is not related to their ability to grow at low inorganic iron concentrations. These results are consistent at low and high light. Physiologically, only three of the four clones shrink or decrease the concentration of chlorophyll a in response to iron limitation, and only one clone decreases colony formation. Together, our data show that P. antarctica clones 1) respond to the same degree of iron limitation using different acclimation strategies, and 2) vary in their ability to grow under the same external iron and light conditions. This physiological diversity is surprisingly large for isolates of a single phytoplankton species.
[Mh] Termos MeSH primário: Haptófitas/fisiologia
Ferro/farmacologia
Luz
Estresse Fisiológico/efeitos dos fármacos
Estresse Fisiológico/efeitos da radiação
[Mh] Termos MeSH secundário: Aclimatação/efeitos dos fármacos
Aclimatação/efeitos da radiação
Clorofila/metabolismo
Contagem de Colônia Microbiana
Desferroxamina/farmacologia
Ácido Edético/farmacologia
Meio Ambiente
Haptófitas/efeitos dos fármacos
Haptófitas/crescimento & desenvolvimento
Haptófitas/efeitos da radiação
Fotossíntese/efeitos dos fármacos
Fotossíntese/efeitos da radiação
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
1406-65-1 (Chlorophyll); 9G34HU7RV0 (Edetic Acid); E1UOL152H7 (Iron); J06Y7MXW4D (Deferoxamine); YF5Q9EJC8Y (chlorophyll a)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170925
[Lr] Data última revisão:
170925
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170711
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179751


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[PMID]:28641894
[Au] Autor:Liu N; Tong S; Yi X; Li Y; Li Z; Miao H; Wang T; Li F; Yan D; Huang R; Wu Y; Hutchins DA; Beardall J; Dai M; Gao K
[Ad] Endereço:State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China.
[Ti] Título:Carbon assimilation and losses during an ocean acidification mesocosm experiment, with special reference to algal blooms.
[So] Source:Mar Environ Res;129:229-235, 2017 Aug.
[Is] ISSN:1879-0291
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A mesocosm experiment was conducted in Wuyuan Bay (Xiamen), China, to investigate the effects of elevated pCO on bloom formation by phytoplankton species previously studied in laboratory-based ocean acidification experiments, to determine if the indoor-grown species performed similarly in mesocosms under more realistic environmental conditions. We measured biomass, primary productivity and particulate organic carbon (POC) as well as particulate organic nitrogen (PON). Phaeodactylum tricornutum outcompeted Thalassiosira weissflogii and Emiliania huxleyi, comprising more than 99% of the final biomass. Mainly through a capacity to tolerate nutrient-limited situations, P. tricornutum showed a powerful sustained presence during the plateau phase of growth. Significant differences between high and low CO treatments were found in cell concentration, cumulative primary productivity and POC in the plateau phase but not during the exponential phase of growth. Compared to the low pCO (LC) treatment, POC increased by 45.8-101.9% in the high pCO (HC) treated cells during the bloom period. Furthermore, respiratory carbon losses of gross primary productivity were found to comprise 39-64% for the LC and 31-41% for the HC mesocosms (daytime C fixation) in phase II. Our results suggest that the duration and characteristics of a diatom bloom can be affected by elevated pCO . Effects of elevated pCO observed in the laboratory cannot be reliably extrapolated to large scale mesocosms with multiple influencing factors, especially during intense algal blooms.
[Mh] Termos MeSH primário: Dióxido de Carbono/análise
Monitoramento Ambiental
Eutrofização/fisiologia
Fitoplâncton/fisiologia
Água do Mar/química
[Mh] Termos MeSH secundário: Biomassa
Carbono/análise
Dióxido de Carbono/metabolismo
China
Diatomáceas/fisiologia
Ecossistema
Haptófitas/fisiologia
Concentração de Íons de Hidrogênio
Nitrogênio/análise
Nitrogênio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
142M471B3J (Carbon Dioxide); 7440-44-0 (Carbon); N762921K75 (Nitrogen)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170624
[St] Status:MEDLINE


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[PMID]:28433900
[Au] Autor:He Y; Qiu C; Guo Z; Huang J; Wang M; Chen B
[Ad] Endereço:College of Life Science, Fujian Normal University, Fuzhou 350117, China.
[Ti] Título:Production of new human milk fat substitutes by enzymatic acidolysis of microalgae oils from Nannochloropsis oculata and Isochrysis galbana.
[So] Source:Bioresour Technol;238:129-138, 2017 Aug.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Human milk fat substitutes (HMFs) with four kinds of n-3 fatty acid for infant formula were firstly synthesized using triacylglycerols (TAGs) from Nannochloropsis oculata rich in PA at the sn-2 position and free fatty acids (FFAs) from Isochrysis galbana rich in n-3 polyunsaturated fatty acids (n-3 PUFAs-ALA/SDA/DHA) via solvent-free acidolysis with Novozym 435, Lipozyme 435, TL-IM and RM-IM as biocatalysts. The results show that the resulting HMFs contain total n-3 PUFA of 13.92-17.12% and PA of 59.38-68.13% at the sn-2 position under the optimal conditions (mole ratio FFAs/TAG 3:1, 60°C (Novozym 435 and Lipozyme TL-IM) and 50°C (Lipozyme 435 and RM-IM), lipase loading 10%, reaction time 24h). Moreover, among the tested enzymes, Lipozyme 435, TL-IM, and RM-IM display the fatty acid selectivity towards SDA, LA and ALA, and OA, respectively. Overall, the examined lipases are promising biocatalysts for producing high-value microalgal HMFs in a cost-effective manner.
[Mh] Termos MeSH primário: Substitutos da Gordura
Microalgas
Leite Humano/química
[Mh] Termos MeSH secundário: Biocatálise
Haptófitas
Seres Humanos
Lipase
Óleos Vegetais
Triglicerídeos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fat Substitutes); 0 (Plant Oils); 0 (Triglycerides); EC 3.1.1.3 (Lipase)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170424
[St] Status:MEDLINE


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[PMID]:28407491
[Au] Autor:Ahmed F; Schenk PM
[Ad] Endereço:Algae Biotechnology Laboratory, School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia; Centre for Marine Bioproducts Development, Faculty of Medicine, Nursing and Health Sciences, Flinders University, Registry Road, Bedford Park, South Australia 5042, Australia. Electronic address: faruq.ahmed@flinders.edu.au.
[Ti] Título:UV-C radiation increases sterol production in the microalga Pavlova lutheri.
[So] Source:Phytochemistry;139:25-32, 2017 Jul.
[Is] ISSN:1873-3700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Plant sterols have become well-known to promote cardiovascular health through the reduction of low density lipoprotein cholesterol in the blood. Plant sterols also have anti-inflammatory, anti-cancer, anti-oxidative and anti-atherogenicity activities. Microalgae have the potential to become a useful alternative source of plant sterols with several species reported to have higher concentrations than current commercial ones. In order to increase phytosterol production and optimise culture conditions, the high sterol producer Pavlova lutheri was treated in different dosages (50-250 mJ m ) of UV-C radiation and several concentrations (1-500 µmol/L) of hydrogen peroxide (H O ) and the sterol contents were quantified for two days after the treatments. The contents of malondialdehyde (MDA) superoxide dismutase (SOD) as indications of cell membrane damage by lipid peroxidation and repair of oxidative stress, respectively, were measured. Higher activities of SOD and MDA were observed in the treated biomass when compared to the controls. Total sterols increased in P. lutheri due to UV-C radiation (at 100 mJ m ) but not in response to H O treatment. Among the nineteen sterol compounds identified in P. lutheri, poriferasterol, epicampesterol, methylergostenol, fungisterol, dihydrochondrillasterol, and chondrillasterol increased due to UV-C radiation. Therefore, UV-C radiation can be a useful tool to boost industrial phytosterol production from P. lutheri.
[Mh] Termos MeSH primário: Microalgas/química
Esteróis
Raios Ultravioleta
[Mh] Termos MeSH secundário: Haptófitas/química
Peróxido de Hidrogênio/farmacologia
Peroxidação de Lipídeos
Estresse Oxidativo
Esteróis/isolamento & purificação
Esteróis/metabolismo
Esteróis/farmacologia
Esteróis/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Sterols); BBX060AN9V (Hydrogen Peroxide)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170804
[Lr] Data última revisão:
170804
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170414
[St] Status:MEDLINE


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[PMID]:28391487
[Au] Autor:Giraldo A; Montes R; Rodil R; Quintana JB; Vidal-Liñán L; Beiras R
[Ad] Endereço:Toralla Marine Station (ECIMAT), University of Vigo, 36331, Vigo, Galicia, Spain. aritzgiraldo@gmail.com.
[Ti] Título:Ecotoxicological Evaluation of the UV Filters Ethylhexyl Dimethyl p-Aminobenzoic Acid and Octocrylene Using Marine Organisms Isochrysis galbana, Mytilus galloprovincialis and Paracentrotus lividus.
[So] Source:Arch Environ Contam Toxicol;72(4):606-611, 2017 May.
[Is] ISSN:1432-0703
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The growing concern regarding the negative effects of solar radiation on the skin has led to a drastic increase in the use of sunscreens containing in its composition up to 10% of aromatic chemicals, such as ethylhexyl dimethyl p-aminobenzoic acid (OD-PABA) and octocrylene (OC). The objective of this study was to evaluate the toxicity and to assess the environmental risk posed by these two ultraviolet filters, widely used in cosmetics and as plastic additives, in the marine environment. Several ecotoxicological bioassays were performed with three model organisms belonging to different trophic levels: the microalgae Isochrysis galbana, the mussel Mytilus galloprovincialis, and the sea urchin Paracentrotus lividus. The results show remarkable toxicity to marine species for both OD-PABA (EC values range 26,5-127 µg L ) and OC (EC range 103-511 µg L ). The cell division in the microalgae I. galbana was the most sensitive endpoint tested. To determine the environmental risk of these substances, the risk coefficient (RQ) was calculated. Due to the higher concentrations reported, OC showed remarkable risk (RQ = 0.27), whereas for OD-PABA the risk was low (RQ = 0.007).
[Mh] Termos MeSH primário: Acrilatos/toxicidade
Organismos Aquáticos/fisiologia
Protetores Solares/toxicidade
Testes de Toxicidade/métodos
Poluentes Químicos da Água/toxicidade
para-Aminobenzoatos/toxicidade
[Mh] Termos MeSH secundário: Animais
Monitoramento Ambiental
Haptófitas
Mytilus
Paracentrotus
Medição de Risco
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acrylates); 0 (Sunscreening Agents); 0 (Water Pollutants, Chemical); 0 (para-Aminobenzoates); 5A68WGF6WM (octocrylene); Z11006CMUZ (padimate-O)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170410
[St] Status:MEDLINE
[do] DOI:10.1007/s00244-017-0399-4


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[PMID]:28335474
[Au] Autor:Nissimov JI; Pagarete A; Ma F; Cody S; Dunigan DD; Kimmance SA; Allen MJ
[Ad] Endereço:Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth PL1 3DH, UK. jnissimov@marine.rutgers.edu.
[Ti] Título:Coccolithoviruses: A Review of Cross-Kingdom Genomic Thievery and Metabolic Thuggery.
[So] Source:Viruses;9(3), 2017 Mar 18.
[Is] ISSN:1999-4915
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Coccolithoviruses (Phycodnaviridae) infect and lyse the most ubiquitous and successful coccolithophorid in modern oceans, Emiliania huxleyi. So far, the genomes of 13 of these giant lytic viruses (i.e., Emiliania huxleyi viruses-EhVs) have been sequenced, assembled, and annotated. Here, we performed an in-depth comparison of their genomes to try and contextualize the ecological and evolutionary traits of these viruses. The genomes of these EhVs have from 444 to 548 coding sequences (CDSs). Presence/absence analysis of CDSs identified putative genes with particular ecological significance, namely sialidase, phosphate permease, and sphingolipid biosynthesis. The viruses clustered into distinct clades, based on their DNA polymerase gene as well as full genome comparisons. We discuss the use of such clustering and suggest that a gene-by-gene investigation approach may be more useful when the goal is to reveal differences related to functionally important genes. A multi domain "Best BLAST hit" analysis revealed that 84% of the EhV genes have closer similarities to the domain Eukarya. However, 16% of the EhV CDSs were very similar to bacterial genes, contributing to the idea that a significant portion of the gene flow in the planktonic world inter-crosses the domains of life.
[Mh] Termos MeSH primário: Phycodnaviridae/genética
[Mh] Termos MeSH secundário: Ecossistema
Evolução Molecular
Transferência Genética Horizontal
Genes Bacterianos
Variação Genética
Tamanho do Genoma
Genoma Viral
Haptófitas/virologia
Phycodnaviridae/classificação
Phycodnaviridae/fisiologia
Filogenia
Análise de Sequência de DNA
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170822
[Lr] Data última revisão:
170822
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170325
[St] Status:MEDLINE


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[PMID]:28335465
[Au] Autor:Mordecai GJ; Verret F; Highfield A; Schroeder DC
[Ad] Endereço:Marine Biological Association of the UK, Citadel Hill, Plymouth PL1 2PB, UK. gidmord@gmail.com.
[Ti] Título:Schrödinger's Cheshire Cat: Are Haploid Emiliania huxleyi Cells Resistant to Viral Infection or Not?
[So] Source:Viruses;9(3), 2017 Mar 18.
[Is] ISSN:1999-4915
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:is the main calcite producer on Earth and is routinely infected by a virus (EhV); a double stranded DNA (dsDNA) virus belonging to the family . exhibits a haplodiploid life cycle; the calcified diploid stage is non-motile and forms extensive blooms. The haploid phase is a non-calcified biflagellated cell bearing organic scales. Haploid cells are thought to resist infection, through a process deemed the "Cheshire Cat" escape strategy; however, a recent study detected the presence of viral lipids in the same haploid strain. Here we report on the application of an CCMP1516 EhV-86 combined tiling array (TA) that further confirms an EhV infection in the RCC1217 haploid strain, which grew without any signs of cell lysis. Reverse transcription polymerase chain reaction (RT-PCR) and PCR verified the presence of viral RNA in the haploid cells, yet indicated an absence of viral DNA, respectively. These infected cells are an alternative stage of the virus life cycle deemed the haplococcolithovirocell. In this instance, the host is both resistant to and infected by EhV, i.e., the viral transcriptome is present in haploid cells whilst there is no evidence of viral lysis. This superimposed state is reminiscent of Schrödinger's cat; of being simultaneously both dead and alive.
[Mh] Termos MeSH primário: Haptófitas/virologia
Phycodnaviridae/fisiologia
[Mh] Termos MeSH secundário: DNA Viral/análise
Haploidia
Haptófitas/genética
Phycodnaviridae/genética
RNA Viral/análise
Transcriptoma
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Viral); 0 (RNA, Viral)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170822
[Lr] Data última revisão:
170822
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170325
[St] Status:MEDLINE



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