Base de dados : MEDLINE
Pesquisa : B01.750.150.600 [Categoria DeCS]
Referências encontradas : 34 [refinar]
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[PMID]:28196482
[Au] Autor:Lie AA; Liu Z; Terrado R; Tatters AO; Heidelberg KB; Caron DA
[Ad] Endereço:Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA. AlleAYLie@gmail.com.
[Ti] Título:Effect of light and prey availability on gene expression of the mixotrophic chrysophyte, Ochromonas sp.
[So] Source:BMC Genomics;18(1):163, 2017 Feb 14.
[Is] ISSN:1471-2164
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Ochromonas is a genus of mixotrophic chrysophytes that is found ubiquitously in many aquatic environments. Species in this genus can be important consumers of bacteria but vary in their ability to perform photosynthesis. We studied the effect of light and bacteria on growth and gene expression of a predominantly phagotrophic Ochromonas species. Axenic cultures of Ochromonas sp. were fed with heat-killed bacteria (HKB) and grown in constant light or darkness. RNA was extracted from cultures in the light or in the dark with HKB present (Light + HKB; Dark + HKB), and in the light after HKB were depleted (Light + depleted HKB). RESULTS: There were no significant differences in the growth or bacterial ingestion rates between algae grown in light or dark conditions. The availability of light led to a differential expression of only 8% of genes in the transcriptome. A number of genes associated with photosynthesis, phagotrophy, and tetrapyrrole synthesis was upregulated in the Light + HKB treatment compared to Dark + HKB. Conversely, the comparison between the Light + HKB and Light + depleted HKB treatments revealed that the presence of HKB led to differential expression of 59% of genes, including the majority of genes involved in major carbon and nitrogen metabolic pathways. Genes coding for unidirectional enzymes for the utilization of glucose were upregulated in the presence of HKB, implying increased glycolytic activities during phagotrophy. Algae without HKB upregulated their expression of genes coding for ammonium transporters, implying uptake of inorganic nitrogen from the culture medium when prey were unavailable. CONCLUSIONS: Transcriptomic results agreed with previous observations that light had minimal effect on the population growth of Ochromonas sp. However, light led to the upregulation of a number of phototrophy- and phagotrophy-related genes, while the availability of bacterial prey led to prominent changes in major carbon and nitrogen metabolic pathways. Our study demonstrated the potential of transcriptomic approaches to improve our understanding of the trophic physiologies of complex mixotrophs, and revealed responses in Ochromonas sp. not apparent from traditional culture studies.
[Mh] Termos MeSH primário: Regulação da Expressão Gênica
Ochromonas/genética
Fotossíntese/genética
[Mh] Termos MeSH secundário: Carbono/metabolismo
Metabolismo Energético/genética
Perfilação da Expressão Gênica
Regulação da Expressão Gênica/efeitos da radiação
Luz
Nitrogênio/metabolismo
Ochromonas/metabolismo
Transcriptoma
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
7440-44-0 (Carbon); N762921K75 (Nitrogen)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170911
[Lr] Data última revisão:
170911
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170216
[St] Status:MEDLINE
[do] DOI:10.1186/s12864-017-3549-1


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[PMID]:28064124
[Au] Autor:Zhang L; Gu L; Wei Q; Zhu X; Wang J; Wang X; Yang Z
[Ad] Endereço:Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
[Ti] Título:High temperature favors elimination of toxin-producing Microcystis and degradation of microcystins by mixotrophic Ochromonas.
[So] Source:Chemosphere;172:96-102, 2017 Apr.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This study aimed to investigate the influence of temperature on the ability of the mixotrophic flagellate Ochromonas to eliminate a toxic Microcystis population and degrade microcystins. We exposed Microcystis to cultures with or without Ochromonas YZ1 at 20, 25, and 30 °C for 10 days. Results showed that increased temperature promoted the growth of Ochromonas YZ1 and Microcystis, with the latter achieving high abundance without grazing. With increased temperature, Ochromonas YZ1 clearance rate increased, and Microcystis populations were earlier eliminated. Importantly, Ochromonas YZ1 degraded both intracellular and extracellular microcystins by grazing effects. The reduction ratios of Microcystis abundances and microcystins were both approximately 100% after 6 days at high temperature. In addition, more microcystins were released outside at 20 °C than at the higher temperatures. Overall, this study showed that high temperature favors elimination of toxin-producing Microcystis and degradation of microcystins by mixotrophic Ochromonas.
[Mh] Termos MeSH primário: Temperatura Alta
Microcistinas/metabolismo
Microcystis/crescimento & desenvolvimento
Ochromonas/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Microcystis/metabolismo
Modelos Teóricos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Microcystins)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170109
[St] Status:MEDLINE


  3 / 34 MEDLINE  
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[PMID]:26889956
[Au] Autor:White AR; Duggan BM; Tsai SC; Vanderwal CD
[Ad] Endereço:Department of Chemistry, University of California , 1102 Natural Sciences II, Irvine, California 92617, United States.
[Ti] Título:The Alga Ochromonas danica Produces Bromosulfolipids.
[So] Source:Org Lett;18(5):1124-7, 2016 Mar 04.
[Is] ISSN:1523-7052
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Many halogenases interchangeably incorporate chlorine and bromine into organic molecules. On the basis of an unsubstantiated report that the alga Ochromonas danica, a prodigious producer of chlorosulfolipids, was able to produce bromosulfolipids, we have investigated the promiscuity of its halogenases toward bromine incorporation. We have found that bromosulfolipids are produced with the exact positional and stereochemical selectivity as in the chlorosulfolipid danicalipin A when this alga is grown under modified conditions containing excess bromide ion.
[Mh] Termos MeSH primário: Hidrocarbonetos Bromados/isolamento & purificação
Lipídeos/isolamento & purificação
Ochromonas/química
[Mh] Termos MeSH secundário: Hidrocarbonetos Bromados/química
Lipídeos/química
Estrutura Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Nm] Nome de substância:
0 (Hydrocarbons, Brominated); 0 (Lipids); 0 (bromodanicalipin A); 0 (danicalipin A); 0 (sulfolipids)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:160304
[Lr] Data última revisão:
160304
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160219
[St] Status:MEDLINE
[do] DOI:10.1021/acs.orglett.6b00230


  4 / 34 MEDLINE  
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[PMID]:26799709
[Au] Autor:Li C; Xiao S; Ju LK
[Ad] Endereço:Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325-3906, USA. Electronic address: CL73@zips.uakron.edu.
[Ti] Título:Cultivation of phagotrophic algae with waste activated sludge as a fast approach to reclaim waste organics.
[So] Source:Water Res;91:195-202, 2016 Mar 15.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Substantial energy is reserved in waste activated sludge (WAS) organics but much of it is difficult to recover because the solid organics require long time to solubilize. In this work we introduced the new approach of recovering WAS organics into the biomass of phagotrophic algae. Phagotrophic algae have the unique ability to grow by ingesting insoluble organic particles including microbial cells. This phagotrophic ability renders the solubilization of WAS organics unnecessary and makes this approach remarkably fast. The approach consists of two stages: a short anaerobic digestion treatment followed by the algal growth on treated WAS. The short anaerobic digestion was exploited to release discrete bacteria from WAS flocs. Phagotrophic algae could then grow rapidly with the released bacteria as well as the solubilized nutrients in the treated WAS. The results showed that WAS organics could be quickly consumed by phagotrophic algae. Among all studied conditions the highest WAS volatile solids (VS) reduction was achieved with 72 h anaerobic digestion and 24 h algal growth. In this optimal process, 28% of WAS VS was reduced, and 41% and 20% of the reduced VS were converted into algal biomass and lipids, respectively. In comparison, only 18% WAS VS were reduced after the same time of aerobic digestion without algae addition. Through this approach, the amount of WAS organics requiring further treatment for final disposal is significantly reduced. With the production of significant amounts of algal biomass and lipids, WAS treatment is expected to be more economical and sustainable in material recycling.
[Mh] Termos MeSH primário: Ochromonas/crescimento & desenvolvimento
Ochromonas/metabolismo
Reciclagem
Eliminação de Resíduos Líquidos/métodos
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Anaerobiose
Biomassa
Reatores Biológicos
Esgotos/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Sewage); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1611
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160123
[St] Status:MEDLINE


  5 / 34 MEDLINE  
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[PMID]:26684731
[Au] Autor:Yang Z; Zhang L; Zhu X; Wang J; Montagnes DJ
[Ad] Endereço:Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, Nanjing, Jiangsu, China.
[Ti] Título:An evidence-based framework for predicting the impact of differing autotroph-heterotroph thermal sensitivities on consumer-prey dynamics.
[So] Source:ISME J;10(7):1767-78, 2016 07.
[Is] ISSN:1751-7370
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Increased temperature accelerates vital rates, influencing microbial population and wider ecosystem dynamics, for example, the predicted increases in cyanobacterial blooms associated with global warming. However, heterotrophic and mixotrophic protists, which are dominant grazers of microalgae, may be more thermally sensitive than autotrophs, and thus prey could be suppressed as temperature rises. Theoretical and meta-analyses have begun to address this issue, but an appropriate framework linking experimental data with theory is lacking. Using ecophysiological data to develop a novel model structure, we provide the first validation of this thermal sensitivity hypothesis: increased temperature improves the consumer's ability to control the autotrophic prey. Specifically, the model accounts for temperature effects on auto- and mixotrophs and ingestion, growth and mortality rates, using an ecologically and economically important system (cyanobacteria grazed by a mixotrophic flagellate). Once established, we show the model to be a good predictor of temperature impacts on consumer-prey dynamics by comparing simulations with microcosm observations. Then, through simulations, we indicate our conclusions remain valid, even with large changes in bottom-up factors (prey growth and carrying capacity). In conclusion, we show that rising temperature could, counterintuitively, reduce the propensity for microalgal blooms to occur and, critically, provide a novel model framework for needed, continued assessment.
[Mh] Termos MeSH primário: Microcystis/fisiologia
Ochromonas/microbiologia
[Mh] Termos MeSH secundário: Processos Autotróficos
Ecossistema
Processos Heterotróficos
Modelos Biológicos
Ochromonas/fisiologia
Dinâmica Populacional
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151220
[St] Status:MEDLINE
[do] DOI:10.1038/ismej.2015.225


  6 / 34 MEDLINE  
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[PMID]:25212544
[Au] Autor:Abomohra Ael-F; El-Sheekh M; Hanelt D
[Ad] Endereço:Phycology Research Unit, Botany Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt, abomohra@yahoo.com.
[Ti] Título:Extracellular secretion of free fatty acids by the chrysophyte Ochromonas danica under photoautotrophic and mixotrophic growth.
[So] Source:World J Microbiol Biotechnol;30(12):3111-9, 2014 Dec.
[Is] ISSN:1573-0972
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Recently, microalgae have gained a lot of attention because of their ability to produce fatty acids in their surrounding environments. The present paper describes the influence of organic carbon on the different fatty acid pools including esterified fatty acids, intracellular free fatty acids and extracellular free fatty acids in Ochromonas danica. It also throws light on the ability of O. danica to secrete free fatty acids in the growth medium under photoautotrophic and mixotrophic conditions. Biomass production of photoautotrophically grown O. danica was higher than that of mixotrophically grown, where a cellular biomass formation of 1.8 g L(-1) was observed under photoautotrophic condition which was about five folds higher than that under mixotrophic conditions. Contrary, the esterified fatty acid content reached up to 99 mg g(-1) CDW under photoautotrophic conditions at the late exponential phase, while during mixotrophic conditions a maximum of 212 mg g(-1) CDW was observed at the stationary phase. Furthermore, O. danica cells grown under mixotrophic conditions showed higher intracellular free fatty acid and extracellular free fatty acid contents (up to 51 and 20 mg g(-1) CDW, respectively) than cells grown under photoautotrophic conditions (up to 26 and 4 mg g(-1) CDW, respectively). The intra- and extracellular free fatty acids consisted of a high proportion of polyunsaturated fatty acids, mainly C18:2n-6, C18:3n-3 and C20:4n-6.
[Mh] Termos MeSH primário: Ácidos Graxos não Esterificados/secreção
Ochromonas/crescimento & desenvolvimento
Ochromonas/metabolismo
[Mh] Termos MeSH secundário: Biomassa
Carbono/metabolismo
Meios de Cultura/química
Citosol/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Culture Media); 0 (Fatty Acids, Nonesterified); 7440-44-0 (Carbon)
[Em] Mês de entrada:1506
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140913
[St] Status:MEDLINE
[do] DOI:10.1007/s11274-014-1738-5


  7 / 34 MEDLINE  
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[PMID]:25138174
[Au] Autor:Wilken S; Schuurmans JM; Matthijs HC
[Ad] Endereço:Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB, Wageningen, the Netherlands; Monterey Bay Aquarium Research Institute (MBARI), 7700 Sandholdt Road, Moss Landing, CA, 95039-0628, USA.
[Ti] Título:Do mixotrophs grow as photoheterotrophs? Photophysiological acclimation of the chrysophyte Ochromonas danica after feeding.
[So] Source:New Phytol;204(4):882-9, 2014 Dec.
[Is] ISSN:1469-8137
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Mixotrophy is increasingly recognized as an important and widespread nutritional strategy in various taxonomic groups ranging from protists to higher plants. We hypothesize that the availability of alternative carbon and energy sources during mixotrophy allows a switch to photoheterotrophic growth, where the photosynthetic apparatus mainly provides energy but not fixed carbon. Because such a change in the function of the photosynthetic machinery is probably reflected in its composition, we compared the photosynthetic machinery in Ochromonas danica during autotrophic and mixotrophic growth. Compared with autotrophic growth, the total pigmentation of O. danica was reduced during mixotrophic growth. Furthermore, the photosystem I (PSI):PSII ratio increased, and the cellular content of Rubisco decreased not only absolutely, but also relative to the content of PSII. The changing composition of the photosynthetic apparatus indicates a shift in its function from providing both carbon and energy during photoautotrophy to mainly providing energy during mixotrophy. This preference for photoheterotrophic growth has interesting implications for the contribution of mixotrophic species to carbon cycling in diverse ecosystems.
[Mh] Termos MeSH primário: Aclimatação
Ochromonas/fisiologia
Fotossíntese
[Mh] Termos MeSH secundário: Processos Autotróficos
Biomassa
Carbono/metabolismo
Clorofila/metabolismo
Ochromonas/crescimento & desenvolvimento
Complexo de Proteína do Fotossistema I/metabolismo
Complexo de Proteína do Fotossistema II/metabolismo
Pigmentos Biológicos/análise
Pigmentos Biológicos/metabolismo
Ribulose-Bifosfato Carboxilase/metabolismo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Photosystem I Protein Complex); 0 (Photosystem II Protein Complex); 0 (Pigments, Biological); 1406-65-1 (Chlorophyll); 7440-44-0 (Carbon); EC 4.1.1.39 (Ribulose-Bisphosphate Carboxylase); YF5Q9EJC8Y (chlorophyll a)
[Em] Mês de entrada:1605
[Cu] Atualização por classe:141104
[Lr] Data última revisão:
141104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140821
[St] Status:MEDLINE
[do] DOI:10.1111/nph.12975


  8 / 34 MEDLINE  
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[PMID]:24018693
[Au] Autor:Yamamoto Y; Kawashima D; Hashizume A; Hisamatsu M; Isono N
[Ad] Endereço:Graduate School of Bioresources, Mie University.
[Ti] Título:Purification and characterization of 1,3-ß-D-glucan phosphorylase from Ochromonas danica.
[So] Source:Biosci Biotechnol Biochem;77(9):1949-54, 2013.
[Is] ISSN:1347-6947
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:1,3-ß-D-glucan phosphorylase (BGP) is an enzyme that catalyzes the reversible phosphorolysis of 1,3-ß-glucosidic linkages to form α-D-glucose 1-phosphate (G1P). Here we report on the purification and characterization of BGP from Ochromonas danica (OdBGP). The purified enzyme preparation showed three bands (113, 118, and 124 kDa) on SDS-polyacrylamide gel electrophoresis. The optimum pH and temperature were 5.5 and 25 °C-30 °C. OdBGP phosphorolysed laminaritriose, larger laminarioligosaccharides, and laminarin, but not laminaribiose. In the synthesis reaction, laminarin and laminarioligosaccharides served as good acceptors, but OdBGP did not act on glucose. Kinetic analysis indicated that the phosphorolysis reaction of OdBGP follows a sequential Bi Bi mechanism. The equilibrium of the enzymatic reaction indicated that OdBGP favors the reaction in the synthetic direction. Overnight incubation of OdBGP with laminaribiose and G1P resulted in the formation of precipitates, which were probably 1,3-ß-glucans.
[Mh] Termos MeSH primário: Ochromonas/enzimologia
Fosforilases/isolamento & purificação
Fosforilases/metabolismo
[Mh] Termos MeSH secundário: Dissacarídeos/metabolismo
Glucofosfatos/metabolismo
Concentração de Íons de Hidrogênio
Cinética
Especificidade por Substrato
Temperatura Ambiente
beta-Glucanas/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Disaccharides); 0 (Glucosephosphates); 0 (beta-1,3-D-glucan); 0 (beta-Glucans); 0WN3D69UW4 (laminaribiose); CIX3U01VAU (glucose-1-phosphate); EC 2.4.1.- (Phosphorylases)
[Em] Mês de entrada:1404
[Cu] Atualização por classe:151119
[Lr] Data última revisão:
151119
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130911
[St] Status:MEDLINE


  9 / 34 MEDLINE  
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[PMID]:23944993
[Au] Autor:Wang Y; Miao AJ; Luo J; Wei ZB; Zhu JJ; Yang LY
[Ad] Endereço:State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing, Jiangsu Province, 210046, China.
[Ti] Título:Bioaccumulation of CdTe quantum dots in a freshwater alga Ochromonas danica: a kinetics study.
[So] Source:Environ Sci Technol;47(18):10601-10, 2013 Sep 17.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The bioaccumulation kinetics of thioglycolic acid stabilized CdTe quantum dots (TGA-CdTe-QDs) in a freshwater alga Ochromonas danica was comprehensively investigated. Their photoluminescence (PL) was determined by flow cytometry. Its cellular intensity increased hyperbolically with exposure time suggesting real internalization of TGA-CdTe-QDs. This hypothesis was evidenced by the nanoparticle uptake experiment with heat-killed or cold-treated cells and by their localization in the vacuoles. TGA-CdTe-QD accumulation could further be well simulated by a biokinetic model used previously for conventional pollutants. Moreover, macropinocytosis was the main route for their internalization. As limited by their diffusion from the bulk medium to the cell surface, TGA-CdTe-QD uptake rate increased proportionally with their ambient concentration. Quick elimination in the PL of cellular TGA-CdTe-QDs was also observed. Such diminishment resulted mainly from their surface modification by vacuolar biomolecules, considering that these nanoparticles remained mostly undissolved and their expulsion out of the cells was slow. Despite the significant uptake of TGA-CdTe-QDs, they had no direct acute effects on O. danica. Overall, the above research shed new light on nanoparticle bioaccumulation study and would further improve our understanding about their environmental behavior, effects and fate.
[Mh] Termos MeSH primário: Compostos de Cádmio/metabolismo
Ochromonas/metabolismo
Pontos Quânticos/metabolismo
Telúrio/metabolismo
[Mh] Termos MeSH secundário: Compostos de Cádmio/química
Compostos de Cádmio/toxicidade
Água Doce
Cinética
Medições Luminescentes
Modelos Biológicos
Ochromonas/efeitos dos fármacos
Ochromonas/crescimento & desenvolvimento
Pontos Quânticos/química
Pontos Quânticos/toxicidade
Telúrio/química
Telúrio/toxicidade
Tioglicolatos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Cadmium Compounds); 0 (Thioglycolates); 7857H94KHM (2-mercaptoacetate); NQA0O090ZJ (Tellurium); STG188WO13 (cadmium telluride)
[Em] Mês de entrada:1404
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130816
[St] Status:MEDLINE
[do] DOI:10.1021/es4017188


  10 / 34 MEDLINE  
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[PMID]:23173644
[Au] Autor:Wilken S; Huisman J; Naus-Wiezer S; Van Donk E
[Ad] Endereço:Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands. s.wilken@nioo.knaw.nl
[Ti] Título:Mixotrophic organisms become more heterotrophic with rising temperature.
[So] Source:Ecol Lett;16(2):225-33, 2013 Feb.
[Is] ISSN:1461-0248
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The metabolic theory of ecology predicts that temperature affects heterotrophic processes more strongly than autotrophic processes. We hypothesized that this differential temperature response may shift mixotrophic organisms towards more heterotrophic nutrition with rising temperature. The hypothesis was tested in experiments with the mixotrophic chrysophyte Ochromonas sp., grown under autotrophic, mixotrophic and heterotrophic conditions. Our results show that (1) grazing rates on bacterial prey increased more strongly with temperature than photosynthetic electron transport rates, (2) heterotrophic growth rates increased exponentially with temperature over the entire range from 13 to 33 °C, while autotrophic growth rates reached a maximum at intermediate temperatures and (3) chlorophyll contents during mixotrophic growth decreased at high temperature. Hence, the contribution of photosynthesis to mixotrophic growth strongly decreased with temperature. These findings support the hypothesis that mixotrophs become more heterotrophic with rising temperature, which alters their functional role in food webs and the carbon cycle.
[Mh] Termos MeSH primário: Processos Autotróficos/fisiologia
Processos Heterotróficos/fisiologia
Ochromonas/fisiologia
[Mh] Termos MeSH secundário: Ochromonas/crescimento & desenvolvimento
Fotossíntese
Dinâmica Populacional
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1309
[Cu] Atualização por classe:130116
[Lr] Data última revisão:
130116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121124
[St] Status:MEDLINE
[do] DOI:10.1111/ele.12033



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