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| Registros recuperados: 26.605 | |
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| Overnell, J; Harvey, Sm; Parkes, Rj. |
| The sediments of the upper basins of Lochs Goil, Fyne and Etive were high in both solid phase extractable manganese (up to 3.7% w/w), and high in pore water manganese (up to 600 mu M), while Loch Linnhe sediments were low in manganese. Solid phase manganese from the surface sediments at the deepest stations was highest in those lochs where the mean residence time of the bottom water is longest, indicating the importance of manganese cycling through the water column. Porewater iron concentrations in the top 2 cm of sediment were highest near the heads of the lochs, i.e. near the main freshwater inputs. Within sediments of Lochs Goil, Fyne and Etive high rates of total sulphate reduction were associated with high relative rates of formation of acid volatile... |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00094/20497/18166.pdf |
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| Le Bris, Nadine. |
| Although occupied submersibles have played an essential role in the discovery and study of hydrothermal ecosystems at depths ranging from 15003500 m, operational constraints at great depths have meant that the wide chemical and thermal diversity of the hydrothermal environments have long remained poorly defi ned. In the last decade, use of remotely operated vehicles (ROVs) to substantially extend dive time and development of a new set of dedicated instruments have greatly expanded our capacity to characterize seafl oor hydrothermal habitats at the interface between hydrothermal fl uid and seawater. In particular, major breakthroughs in the fi eld of in situ chemical sensing and highpressure experimentation have led to a much better understanding of the... |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-6388.pdf |
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| Mairet, Francis. |
| Homeostasis is the capacity of living organisms to keep internal conditions regulated at a constant level, despite environmental fluctuations. Integral feedback control is known to play a key role in this behaviour. Here, I show that a feedback system involving transcriptional and post-translational regulations of the same executor protein acts as a proportional integral (PI) controller, leading to enhanced transient performances in comparison with a classical integral loop. Such a biomolecular controller-which I call a level and activity-PI controller (LA-PI)-is involved in the regulation of ammonium uptake by Escherichia coli through the transporter AmtB. The P-II molecules, which reflect the nitrogen status of the cell, inhibit both the production of... |
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Palavras-chave: Homeostasis; Perfect adaptation; Regulatory motif; Transcriptional and post-translational regulations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00434/54598/55968.pdf |
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| Bustabad, E. A.; Garcia, G; Rodriguez-pardo, L.; Farina, J.; Perrot, H.; Gabrielli, C.; Bucur, B.; Lazerges, M.; Rose, D.; Compere, Chantal; Arnau, A.. |
| This work deals with the development of a high sensibility DNA biosensor based on a 50MHz Quartz Crystal Microbalance (QCM) Oscillator Electronic Circuit. The designed QCM oscillator sensor is able to detect the presence of complementary DNAs in a solution that match the sequence on a given strand in function of the changes in the output frequency of the oscillator. The design is adapted so that the Barkhausen condition is satisfied even when the quartz is immerged in liquid media. Also a comparative study of the developed 50MHz biosensor in front of a QCM oscillator with smaller frequency is carried out, with object of checking if the sensibility of the oscillator increases, allowing to detect smaller concentrations of the complementary DNA. |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00021/13198/10574.pdf |
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| Howell, Kerry L.; Hilário, Ana; Allcock, A. Louise; Bailey, David M.; Baker, Maria; Clark, Malcolm R.; Colaço, Ana; Copley, Jon; Cordes, Erik E.; Danovaro, Roberto; Dissanayake, Awantha; Escobar, Elva; Esquete, Patricia; Gallagher, Austin J.; Gates, Andrew R.; Gaudron, Sylvie M.; German, Christopher R.; Gjerde, Kristina M.; Higgs, Nicholas D.; Le Bris, Nadine; Levin, Lisa A.; Manea, Elisabetta; Mcclain, Craig; Menot, Lenaick; Mestre, Nelia C.; Metaxas, Anna; Milligan, Rosanna J.; Muthumbi, Agnes W. N.; Narayanaswamy, Bhavani E.; Ramalho, Sofia P.; Ramirez-llodra, Eva; Robson, Laura M.; Rogers, Alex D.; Sellanes, Javier; Sigwart, Julia D.; Sink, Kerry; Snelgrove, Paul V. R.; Stefanoudis, Paris V.; Sumida, Paulo Y.; Taylor, Michelle L.; Thurber, Andrew R.; Vieira, Rui P.; Watanabe, Hiromi K.; Woodall, Lucy C.; Xavier, Joana R.. |
| The ocean plays a crucial role in the functioning of the Earth System and in the provision of vital goods and services. The United Nations (UN) declared 2021–2030 as the UN Decade of Ocean Science for Sustainable Development. The Roadmap for the Ocean Decade aims to achieve six critical societal outcomes (SOs) by 2030, through the pursuit of four objectives (Os). It specifically recognizes the scarcity of biological data for deep-sea biomes, and challenges the global scientific community to conduct research to advance understanding of deep-sea ecosystems to inform sustainable management. In this paper, we map four key scientific questions identified by the academic community to the Ocean Decade SOs: (i) What is the diversity of life in the deep ocean? (ii)... |
| Tipo: Text |
Palavras-chave: Deep sea; Blue economy; Ocean Decade; Biodivercity; Essential ocean variables. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00666/77768/79904.pdf |
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| Elvarsson, B. P.; Taylor, L.; Trenkel, Verena; Kupca, V.; Stefansson, G.. |
| Statistical models of marine ecosystems use a variety of data sources to estimate parameters using composite or weighted likelihood functions with associated weighting issues and questions on how to obtain variance estimates. Regardless of the method used to obtain point estimates, a method is required for variance estimation. A bootstrap technique is introduced for the evaluation of uncertainty in such models, taking into account inherent spatial and temporal correlations in the datasets, which are commonly transferred as assumptions from a likelihood estimation procedure into Hessian-based variance estimation procedures. The technique is demonstrated on a real dataset and the effects of the number of bootstrap samples on estimation bias and variance... |
| Tipo: Text |
Palavras-chave: Bootstrapping; Correlated data; Fish population dynamics; Non-linear models. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00193/30459/29913.pdf |
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| Pete, Romain; Guyondet, Thomas; Bec, Beatrice; Derolez, Valerie; Cesmat, Ludovic; Lagarde, Franck; Pouvreau, Stephane; Fiandrino, Annie; Richard, Marion. |
| The decrease of microbial and nutrient inputs from the watershed has long dominated lagoon ecosystem management objectives. Phytoplankton biomass and abundance have drastically decreased for more than a decade and Zostera meadow have gradually recovered, expressing lagoon ecosystem restoration such as Thau lagoon. Do the progressive achievement of the good ecological status of the Thau lagoon possibly threatens the shellfish industry in terms of production and oyster quality, by reducing the carrying capacity? To provide answers about the right balance to be achieved between conservation and exploitation, a new numerical tool was developed to help in decision-making. We hereby propose to incorporate a Dynamic Energy Budget type shellfish production model... |
| Tipo: Text |
Palavras-chave: Shellfish farming; Carrying capacity; Stakeholder implication; Nitrogen and phosphorus inputs; Water frame directive; Ecological indicators; Phytoplankton depletion; Coupled biogeochemical-deb model. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00622/73395/75312.pdf |
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| Eldevik, Tor; Risebrobakken, Bjorg; Bjune, Anne E.; Andersson, Carin; Birks, H. John B.; Dokken, Trond M.; Drange, Helge; Glessmer, Mirjam S.; Li, Camille; Nilsen, Jan Even O.; Ottera, Odd Helge; Richter, Kristin; Skagseth, Oystein. |
| The understanding of climate and climate change is fundamentally concerned with two things: a well-defined and sufficiently complete climate record to be explained, for example of observed temperature, and a relevant mechanistic framework for making closed and consistent inferences concerning cause-and-effect. This is the case for understanding observed climate, as it is the case for historical climate as reconstructed from proxy data and future climate as projected by models. The present study offers a holistic description of northern maritime climate from the Last Glacial Maximum through to the projected global warming of the 21st century in this context. It includes the compilation of the most complete temperature record for Norway and the Norwegian Sea... |
| Tipo: Text |
Palavras-chave: LGM-to-future North Atlantic; Nordic seas; And Arctic Climate Marine Terrestrial Reconstruction Observations Climate model Temperature Thermohaline circulation. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40031/38847.pdf |
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| Whitby, Hannah; Planquette, Helene; Cassar, Nicolas; Bucciarelli, Eva; Osburn, Christopher L.; Janssen, David J.; Cullen, Jay T.; González, Aridane G.; Völker, Christoph; Sarthou, Geraldine. |
| Primary production by phytoplankton represents a major pathway whereby atmospheric CO2 is sequestered in the ocean, but this requires iron, which is in scarce supply. As over 99% of iron is complexed to organic ligands, which increase iron solubility and microbial availability, understanding the processes governing ligand dynamics is of fundamental importance. Ligands within humic-like substances have long been considered important for iron complexation, but their role has never been explained in an oceanographically consistent manner. Here we show iron co-varying with electroactive humic substances at multiple open ocean sites, with the ratio of iron to humics increasing with depth. Our results agree with humic ligands composing a large fraction of the... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00622/73388/72598.pdf |
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| Le Maréchal, Caroline; Hulin, Olivier; Macé, Sabrina; Chuzeville, Cécile; Rouxel, Sandra; Poëzevara, Typhaine; Mazuet, Christelle; Pozet, Françoise; Sellal, Eric; Martin, Laure; Viry, Alain; Rubbens, Christine; Chemaly, Marianne. |
| We report a botulism outbreak in Charolais cattle fed with wheat flour contaminated by Clostridium botulinum type C and the management of the outbreak at each step from the clinical suspicion to the cleaning and disinfection operations. Diagnosis was based on typical suggestive clinical signs and detection of C. botulinum type C using real-time PCR in samples collected from three young affected bulls. All young exposed bulls and cows (18 animals) eventually died, but three young bulls and one cow were recovering when it was decided to euthanize them. C. botulinum type C was detected in the liver of these four animals. Analysis of the ration components demonstrated that wheat flour, wheat, and the mill used to make flour were positive for C. botulinum type... |
| Tipo: Text |
Palavras-chave: Cattle botulism; Cat carcass; PCR; Wheat; Clostridium botulinum; Feed contamination. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00603/71516/69936.pdf |
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| Le Floc'H, Pascal; Daures, Fabienne; Guyader, Olivier; Wilson, James. |
| Many sectors such as the fishery show classic examples of technological lock-in and path dependence, even though some economists might predict smooth switching toward technologies that are more cost effective and sustainable. We use ideas from the evolutionary economics and public choice literatures to explain why trajectories of technological change, especially in fisheries, may not be smooth at all, but rather punctuated. The interest of technological change and switching behavior for fisheries economists and managers stems from the fact that control of effective effort, often necessary for sustainable management of the resource, remains a central management problem for that sector worldwide, even in developed countries. However, various policies put in... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00109/21987/20057.pdf |
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| Lu, Yiru; Zhang, Biao; Perrie, William; Mouche, Alexis; Li, Xiaofeng; Wang, He. |
| A new geophysical model function (GMF), called C_SARMOD2, has been developed to relate high-resolution C-band normalized radar cross section (NRCS), acquired in VV polarization over the ocean, to the 10-m height wind speed. A total of 3078 RADARSAT-2 and Sentinel-1A VV-polarized synthetic aperture radar (SAR) images, acquired under different wind speed conditions, were collocated with in situ buoy measurements. The paired dataset was used to derive transfer functions and coefficients of C_SARMOD2, and then to validate the wind speed retrievals. The comparison between SAR-retrieved wind speeds and buoy measurements show almost no bias and a root mean square error of 1.84 m/s. Two representative quad-and dual-polarization SAR images, acquired from coastal... |
| Tipo: Text |
Palavras-chave: Coastal wind speed; Geophysical model function (GMF); Synthetic aperture radar (SAR). |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00452/56390/60555.pdf |
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| Decker, Cj; O'Dor, R. |
| As an introduction to the entire volume, this article outlines the relationships among the five elements of the Census of Marine Life (CoML) that create new knowledge: (1) The Ocean Biogeographic Information System (OBIS), a marine component of the Global Biodiversity Information Facility, links marine databases around the world to provide an Internet accessible, dynamic interface for comparing species-level, geo-referenced biodiversity data in relation to ocean habitats. The entire CoML field project data will be managed in and accessible through OBIS. (2) The History of Marine Animal Populations (HMAP) is a unique new synthesis of historical and biological research that will document marine biodiversity, globally, up to 500 years ago, before significant... |
| Tipo: Text |
Palavras-chave: Biodiversité; Recensement; Recherche; Biogéographie; Biodiversity; Census; Global; Research; Biogeography. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00322/43299/43035.pdf |
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| Barbosa Aguiar, Ana Claudia; Peliz, Alvaro; Carton, Xavier. |
| The output from a high-resolution two-decade long Mediterranean Outflow simulation is analysed here to provide a census of Mediterranean Water eddies (aka Meddies), both anticyclones and cyclones. The formation rate of Meddies that survive for at least 90 days is of 12 Meddies yr(-1) of which similar to 12% are cyclones. The rate of formation reaches 40 Meddies yr(-1) (30% cyclones) when considering all the Meddies living over 15 days. About 70% of the population is born along the southwestern Iberian slope, but several robust Meddles also originate in points of convergence of the main pathways into the open ocean. The longest-lived Meddies propagate northwestwards, but most of the anticyclones veer southwestwards after a while. As the Meddies drift away... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00159/27073/25474.pdf |
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| Trenkel, Verena. |
| In this poster I will present the results from text mining analyses of the abstracts of the current and previous ICES acoustic symposia as well as WGFAST working group reports. By creating and comparing lists of the most common words in each symposium and WGFAST reports it will be possible to measure the overall change in breadth and possible shifts in focus in the field of marine ecosystem acoustics. The same analysis will also identify the contribution of WGFAST to the progress in the field. An analysis of the authors will provide means to characterize the structure of the research fellow communities participating in ICES acoustic symposia and WGFAST meetings. |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00598/71042/69352.pdf |
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| Greene, Hg; Yoklavich, Mm; Starr, Rm; O'Connell, Vm; Wakefield, Ww; Sullivan, De; Mcrea, Je; Cailliet, Gm. |
| A standard, universally useful classification scheme for deepwater habitats needs to be established so that descriptions of these habitats can be accurately and efficiently applied among scientific disciplines. In recent years many marine benthic habitats in deep water have been described using geophysical and biological data. These descriptions can vary from one investigator to another, which makes it difficult to compare habitats and associated biological assemblages among geographic regions. Using geophysical data collected with a variety of remote sensor systems and in situ biological and geologic observations, we have constructed a classification scheme that can be used in describing marine benthic habitats in deep water. |
| Tipo: Text |
Palavras-chave: Habitat; Classification universelle; Benthique; Gestion des pêcheries; Habitat; Universal classification; Benthic; Fisheries management. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43590/44030.pdf |
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| Registros recuperados: 26.605 | |
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