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| Registros recuperados: 51 | |
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| Bittig, Henry; Körtzinger, Arne; Johnson, Ken; Claustre, Herve; Emerson, Steve; Fennel, Katja; Garcia, Hernan; Gilbert, Denis; Gruber, Nicolas; Kang, Dong-jin; Naqvi, Wajih; Prakash, Satya; Riser, Steven; Thierry, Virginie; Tilbrook, Bronte; Uchida, Hiroshi; Ulloa, Osvaldo; Xing, Xiaogang. |
| Tipo: Text |
Palavras-chave: Argo; Bio-argo; Oxygen. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00348/45915/56281.pdf |
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| Thierry, Virginie; Bittig, Henry; Gilbert, Denis; Kobayashi, Taiyo; Kanako, Sato; Schmid, Claudia. |
| This document does NOT address the issue of oxygen data quality control (either real-time or delayed mode). As a preliminary step towards that goal, this document seeks to ensure that all countries deploying floats equipped with oxygen sensors document the data and metadata related to these floats properly. We produced this document in response to action item 14 from the AST-10 meeting in Hangzhou (March 22-23, 2009). Action item 14: Denis Gilbert to work with Taiyo Kobayashi and Virginie Thierry to ensure DACs are processing oxygen data according to recommendations. If the recommendations contained herein are followed, we will end up with a more uniform set of oxygen data within the Argo data system, allowing users to begin analysing not only their own... |
| Tipo: Text |
Palavras-chave: Argo; Bio-argo; Oxygen. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00287/39795/59750.pdf |
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| Lefebvre, Alain; Devreker, David. |
| The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of... |
| Tipo: Text |
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf |
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| Giorgetti, Alessandra; Lipizer, Marina; Molina Jack, Maria Eugenia; Holdsworth, Neil; Jensen, Hans Mose; Buga, Luminita; Sarbu, George; Iona, Athanasia; Gatti, Julie; Larsen, Martin; Fyrberg, Lotta; Østrem, Ann Kristin; Schlitzer, Reiner. |
| Tipo: Text |
Palavras-chave: Nutrients; Oxygen; Acidity; Contaminants; Sediment; Biota; Aggregated datasets. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00663/77519/79314.pdf |
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| Tengberg, A; Hovdenes, J; Andersson, H; Brocandel, O; Diaz, R; Hebert, D; Arnerich, T; Huber, C; Kortzinger, A; Khripounoff, Alexis; Rey, F; Ronning, C; Schimanski, J; Sommer, S; Stangelmayer, A. |
| In this article, we evaluate the performance of a commercially available lifetime-based optode and compare it with data obtained by other methods. We performed a set of 10 different tests, including targeted laboratory evaluations and field studies, covering a wide range of situations from shallow coastal waters and wastewater treatment plants to abyssal depths. Our principal conclusion is that, owing to high accuracy (+/- 2 mu M), long-term stability (more than 20 months), lack of pressure hysteresis, and limited cross-sensitivity, this method is overall more suitable for oxygen monitoring than other methods. |
| Tipo: Text |
Palavras-chave: Lifetime based optode; Measure; Oxygen; Aquatic systems. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1413.pdf |
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| Kheireddine, Malika; Dall'Olmo, Giorgio; Ouhssain, Mustapha; Krokos, George; Claustre, Hervé; Schmechtig, Catherine; Poteau, Antoine; Zhan, Peng; Hoteit, Ibrahim; Jones, Burton H.. |
| The export and fate of organic carbon in the mesopelagic zone are still poorly understood and quantified due to lack of observations. We exploited data from a biogeochemical‐Argo float that was deployed in the Red Sea to study how a warm and hypoxic environment can affect the fate of the organic carbon in the ocean's interior. We observed that only 10% of the particulate organic carbon (POC) exported survived at depth due to remineralization processes in the upper mesopelagic zone. We also found that POC exported was rapidly degraded in a first stage and slowly in a second one, which may be dependent on the palatability of the organic matter. We observed that apparent oxygen utilization (AOU)‐based loss rates (a proxy of the remineralization of total... |
| Tipo: Text |
Palavras-chave: Carbon export; Carbon loss rates; Mesopelagic zone; Temperature; Oxygen; Tropical ecosystem. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00655/76730/77877.pdf |
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| Pineda, Mar; Aragao, Isabel; Mckenzie, David; Killen, Shaun S.. |
| In some fishes, the ability to breathe air has evolved to overcome constraints in hypoxic environments but comes at a cost of increased predation. To reduce this risk, some species perform group air breathing. Temperature may also affect the frequency of air breathing in fishes, but this topic has received relatively little research attention. This study examined how acclimation temperature and acute exposure to hypoxia affected the air-breathing behaviour of a social catfish, the bronze corydoras Corydoras aeneus, and aimed to determine whether individual oxygen demand influenced the behaviour of entire groups. Groups of seven fish were observed in an arena to measure air-breathing frequency of individuals and consequent group air-breathing behaviour,... |
| Tipo: Text |
Palavras-chave: Air-breathing fish; Environmental stress; Metabolic rate; Oxygen; Social behaviour. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00661/77271/78705.pdf |
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| Lefrancois, Christelle; Claireaux, Guy. |
| The objective of this study was to quantify the constraints exerted by temperature and oxygenation on both metabolic scope and scope for heart rate of the common sole Solea solea. We exposed sole to a large range of temperature and oxygenation conditions and a modelling procedure was implemented to describe metabolic and cardiac responses. Standard metabolic rate (SMR) rose exponentially from 4 to 24degreesC, whereas active metabolic rate (AMR) increased from 55.4 to 159.2 mgO(2) kg(-1) h(-1) between 4 and 19.7degreesC, and then dropped to 129.9 mgO(2) kg(-1) h(-1) at 24degreesC. In parallel, optimal temperature for maximising metabolic scope, defined as the difference between AMR and SMR, was estimated to 18.8degreesC. Active heart rates increased... |
| Tipo: Text |
Palavras-chave: Metabolic scope; Heart rate; Biological performance; Temperature; Oxygen; Common sole. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00000/10690/7594.pdf |
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| Machu, Eric; Capet, Xavier; Estrade, Philippe; Ndoye, S.; Brajard, J.; Baurand, Francois; Auger, P.-a.; Lazar, A.; Brehmer, Patrice. |
| The northeastern Atlantic hosts the most ventilated subsurface waters of any eastern boundary upwelling system, while coastal upwelling source waters are slightly above hypoxic levels. Anoxic conditions have previously been found offshore inside mesoscale eddies whose core waters undergo oxygen consumption for many months. Based on circumstantial in situ observations this study demonstrates that the Senegalese coastal ocean is subjected to episodic occurrence of zero dissolved oxygen concentration at depth along with elevated nitrite concentration (11 mmol/m3) and nitrate/nitrite deficit to phosphate, thereby indicating severe anoxia and intense nitrogen loss. The anoxic event was associated with a prolonged upwelling relaxation episode in March 2012 and a... |
| Tipo: Text |
Palavras-chave: Oxygen; Canary upwelling system; Anoxia; Denitrification; Shallow continental shelf. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00479/59020/61640.pdf |
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| Pereira,Jéssica A.; Veronez,Alexandra C.S.; Coppo,Gabriel C.; Duca,Charles; Chippari-Gomes,Adriana R.; Gomes,Levy C.. |
| ABSTRACT Oxygen and temperature are the most limiting factors in aquatic environments. Several species are exposed to variations of these factors in water because of physical, chemical and biological processes. The objective of this study was to evaluate the metabolic profile and the tolerance to the hypoxia of Geophagus brasiliensis exposed to changes in temperature and oxygen availability. The fish were exposed to 20 and 90% of oxygen saturation combined with different temperatures (20°, 24° and 28° C) for 8 h. Hepatic and muscular glycogen, as well as the activities of lactate dehydrogenase (LDH), malate dehydrogenase (MDH), citrate synthase (CS) and their ratios were evaluated. Both glycogen and MDH activity showed a significant difference in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aerobic and anaerobic pathways; Behavior; Metabolism; Oxygen. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100202 |
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| Cruz, L.; Jacxsens, J.; Siro, I.; Devlieghere, F.; Debevere, J.. |
| El objetivo del presente trabajo fue evaluar la conservación de fresas frescas envasadas en: (i) atmósfera con alta concentración de oxígeno (AAO) en envases con atmósfera modificada en equilibrio (AME) (película permeable), (ii) AAO en envases con AME con adición de un adsorbedor de etileno (AE) y (iii) envases macroperforados (aire), tomados como referencia. En los envases con AME se empleó una película de permeabilidad selectiva al oxígeno y al dióxido de carbono. La temperatura de almacenamiento fue de 7 ºC. La composición gaseosa fue 95 % de oxígeno y 5 % de nitrógeno. Se efectuaron conteos de levaduras, bacterias ácido lácticas y microorganismos psicrófilos y anaerobios totales. Se evaluaron las pérdidas de peso por pérdida de humedad, afectaciones... |
| Tipo: Journal Contribution |
Palavras-chave: Oxygen; Packaging materials; Modified atmosphere storage; Strawberry (tree). |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5015 |
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| André, E.. |
| Foi observado um evento de afloramento de algas nocivas e morte maciça de peixes e interrupção temporária das actividades turísticas na lagoa de Bilene, Moçambique em 2007. O presente estudo pretende fazer uma caracterização da hidrodinâmica e do estado trófico desta lagoa e compreender processos que resultam em afloramentos de algas tóxicas. Entre Julho de 2010 e Agosto de 2011, foram realizados oito campanhas de colheitas de dados de CTD incluindo a concentração de oxigénio em água,cobrindo um ciclo anual. Os resultados revelaram que a Lagoa de Bilene contem duas sub-bacias, uma a sul, maior em extensão geográfica mas menos profunda, e uma bacia a norte, com menor extensão geográfica mas mais profunda. As massas de água tem uma caracterização típica com... |
| Tipo: Journal Contribution |
Palavras-chave: Eutrophication; Fertilization (biological); Salinity; Oxygen; Temperature; Oxygen deficiency; Temperature. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5143 |
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| Rodriguez de Morán, A.. |
| The current research was developed in Bahia of Jaramijó in the Province of Manabí during 2008, as part of the major project: " Characterization of the Ecuadorian Coast" that has been developing by INOCAR, in order to contribute to the proper use of resources and the environment. It characterized and assesses the results obtained in the research of the quality of water of Bahía of Jaramijó, taking into consideration the averages and their behaviour in each level studied in two different season in the year (wet-dry) and in two tide condition (ebb and flow) of the different parameter physical, chemical and microbiological. During the research was established that coastal marine waters of Bahía of Jaramijó, not show pollution of organic origin neither... |
| Tipo: Journal Contribution |
Palavras-chave: Water quality; Environmental legislation; Bacteria; Pollution; Oxygen. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5758 |
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| Okur,N. |
| ABSTRACT This study investigated the effects of incubator carbon dioxide (CO2) and oxygen (O2) levels, and egg weight (EW) on embryo mortality (EM) and hatchability of fertile eggs (HFE). A total of 1920 hatching eggs were obtained from a middle-aged (41 weeks) ROSS 308 broiler breeder flock. The eggs were classified according to EW as heavy (69.63 ± 0.09 g), medium (65.20 ± 0.04 g) and light (61.11 ± 0.08 g) and randomly allocated to four separate identical incubators. To these incubators, four different incubator ventilation programmes (IVP) classified as control (C; 0.7% CO2 and 20.9% O2), high CO2 (HC; 1.1% CO2 and 20.3% O2), high O2 (HO; 0.6% CO2 and 22.0% O2), and high CO2 + O2 (HCO; 0.9% CO2 21.0% O2) were applied, and EM and HFE were examined. IVP... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broiler; Carbon dioxide; Egg weight; Incubation; Oxygen. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300310 |
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| Shi,Luye; Jiang,Mengwan; Li,Mengyang; Shang,Xiaozhen; Li,Xiujuan; Huang,Maolin; Wu,Yue; Qiao,Congcong; Wang,Xinrui; Tian,Xiangyu; Shi,Yuhua; Wang,Zhenlong. |
| ABSTRACT The response mechanism and interaction patterns of HIF-1α and p53 in animals in an hypoxic environment are crucial for their hypoxic tolerance and adaptation. Many studies have shown that underground rodents have better hypoxic adaptation characteristics. However, the mechanism by which HIF-1α and p53 in underground rodents respond to hypoxic environments compared with in ground rodents remains unclear. Further, whether a synergy between HIF-1α and p53 enables animals tolerate extremely hypoxic environments is unclear. We studied HIF-1α and p53 expression in the brain tissue and cell apoptosis in the hippocampal CA1 region during 6 hours of acute hypoxia (5% oxygen) in Lasiopodomys mandarinus (Milne-Edwards, 1871) and Lasiopodomys brandtii (Radde,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Comparative biology; Hippocampal CA1 region; Oxygen; Subterranean rodents. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702021000100305 |
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| Registros recuperados: 51 | |
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