Water masses and circulation of the Mozambique Channel

From 1977 to 1980, several research cruises were carried out in the coastal waters of Mozambique to collect oceanographic data. The distribution of hydrographic and bathythermograph stations is given. The water masses and circulation were mapped and wind data gathered

Information on oceanographic cruises in the Mozambique Channel

The primary objectives of this data summary are to display features of the distribution of hydrographic and chemical parameters in the Mozambique Channel in a form which will be useful for oceanographers, and to serve as a basis for the processing of more recent data obtained since 1977

Man's Impact on the Barents Sea

The Barents Sea ecosystem is a polar system with high biological production. Production takes place during a short season, mainly along the ice margin. As biological production is very limited in both space and time, the ecosystem is vulnerable to the influence of human activity. Fishing activity represents the most significant environmental load by man on the Barents Sea. In recent years offshore oil and gas exploration activity has increased, resulting in environmental problems as well as conflicts with fishing operations. Heavy metals and organic contaminants of man-made origin have been observed in both sediments and organisms at different trophic levels. Both long-range atmospheric transport and transport by ocean currents are important. Organic contaminants accumulate mainly in the body fat of the organisms; northern ecosystems are therefore especially vulnerable because fat has much greater ecological importance in such systems than in more southerly ecosystems. In recent years there has been public concern in both Norway and Russia over the possibility of radioactive pollution. Nuclear power plants, nuclear vessels and weapons are present in the area and produce radioactive wastes. Reports of wastes have influenced public opinion in many countries. The Barents Sea is strongly influenced by ocean climate variations. Global climate models forecast that the most elevated ocean temperatures due to possible greenhouse effects will probably occur in polar regions.Key words: Barents Sea, fishing, offshore oil activity, organic contaminants, radioactivityL'écosystème de la mer de Barents est un système polaire ayant une haute productivité biologique. La production a lieu au cours d'une brève saison, principalement le long de la marge glaciaire. Étant donné que la production biologique est très limitée à la fois dans le temps et dans l'espace, l'écosystème est très sensible à l'activité humaine. La pêche constitue le plus gros fardeau environnemental que fait peser l'être humain sur la mer de Barents. Au cours des dernières années, l'exploration pétrolière et gazière au large a augmenté, donnant lieu à des problèmes écologiques ainsi qu'à des conflits avec l'industrie de la pêche. On a trouvé des métaux lourds et des contaminants organiques anthropiques dans les sédiments comme dans les organismes, et ce, à différents niveaux trophiques. Le transport atmosphérique de longue portée et le transport par les courants océaniques sont importants. Les contaminants organiques s'accumulent surtout dans le tissu adipeux des organismes; les écosystèmes nordiques sont donc particulièrement vulnérables car le gras a beaucoup plus d'importance écologique dans ces systèmes que dans des écosystèmes localisés plus au sud. Durant les dernières années, en Norvège comme en Russie, le public s'est dit concerné par une éventuelle pollution radioactive. Centrales, vaisseaux et armes nucléaires sont présents dans la région et produisent des déchets radioactifs. Des rapports sur ces déchets ont influencé l'opinion publique dans de nombreux pays. La mer de Barents est fortement influencée par les variations du climat océanique. Des modèles climatiques planétaires prédisent que c'est probablement dans les régions polaires que se produiront les plus fortes hausses de températures océaniques dues à l'effet de serre éventuel.Mots clés: mer de Barents, pêche, activité pétrolière au large, contaminants organiques, radioactivit&eacute

The What and Why of Research on Reinforcement

Reinforcement - a process that helps prevent interbreeding between hybridising populations - is an important and little understood mechanism driving the completion of speciatio

PLATINUM SENSITIVE 2 LIKE impacts growth, root morphology, seed set, and stress responses

Eukaryotic protein phosphatase 4 (PP4) is a PP2A-type protein phosphatase that is part of a conserved complex with regulatory factors PSY2 and PP4R2. Various lines of Arabidopsis thaliana with mutated PP4 subunit genes were constructed to study the so far completely unknown functions of PP4 in plants. Mutants with knocked out putative functional homolog of the PSY2 LIKE (PSY2L) gene were dwarf and bushy, while plants with knocked out PP4R2 LIKE (PP4R2L) looked very similar to WT. The psy2l seedlings had short roots with disorganized morphology and impaired meristem. Seedling growth was sensitive to the genotoxin cisplatin. Global transcript analysis (RNA-seq) of seedlings and rosette leaves revealed several groups of genes, shared between both types of tissues, strongly influenced by knocked out PSY2L. Receptor kinases, CRINKLY3 and WAG1, important for growth and development, were down-regulated 3–7 times. EUKARYOTIC ELONGATION FACTOR5A1 was down-regulated 4–6 fold. Analysis of hormone sensitive genes indicated that abscisic acid levels were high, while auxin, cytokinin and gibberellic acid levels were low in psy2l. Expression of specific transcription factors involved in regulation of anthocyanin synthesis were strongly elevated, e.g. the master regulator PAP1, and intriguingly TT8, which is otherwise mainly expressed in seeds. The psy2l mutants accumulated anthocyanins under conditions where WT did not, pointing to PSY2L as a possible upstream negative regulator of PAP1 and TT8. Expression of the sugar-phosphate transporter GPT2, important for cellular sugar and phosphate homeostasis, was enhanced 7–8 times. Several DNA damage response genes, including the cell cycle inhibitor gene WEE1, were up-regulated in psy2l. The activation of DNA repair signaling genes, in combination with phenotypic traits showing aberrant root meristem and sensitivity to the genotoxic cisplatin, substantiate the involvement of Arabidopsis PSY2L in maintenance of genome integrity.publishedVersio

A realistic assessment of methods for extracting gene/protein interactions from free text

Background: The automated extraction of gene and/or protein interactions from the literature is one of the most important targets of biomedical text mining research. In this paper we present a realistic evaluation of gene/protein interaction mining relevant to potential non-specialist users. Hence we have specifically avoided methods that are complex to install or require reimplementation, and we coupled our chosen extraction methods with a state-of-the-art biomedical named entity tagger. Results: Our results show: that performance across different evaluation corpora is extremely variable; that the use of tagged (as opposed to gold standard) gene and protein names has a significant impact on performance, with a drop in F-score of over 20 percentage points being commonplace; and that a simple keyword-based benchmark algorithm when coupled with a named entity tagger outperforms two of the tools most widely used to extract gene/protein interactions. Conclusion: In terms of availability, ease of use and performance, the potential non-specialist user community interested in automatically extracting gene and/or protein interactions from free text is poorly served by current tools and systems. The public release of extraction tools that are easy to install and use, and that achieve state-of-art levels of performance should be treated as a high priority by the biomedical text mining community

Design of an MgB₂race track coil for a wind generator pole demonstration

An MgB2 race track coil intended for demonstrating a down scaled pole of a 10 MW direct drive wind turbine generator has been designed. The coil consists of 10 double pancake coils stacked into a race track coil with a cross section of 84 mm x 80 mm. The length of the straight section is 0.5 m and the diameter of the end sections is 0.3 m. Expanded to a straight section of 3.1 m it will produce about 1.5 T magnetic flux density in the air gap of the 10 MW 32 pole generator and about 3.0 T at the edge of the superconducting coil with an operation current density of the coil of 70 A/mm2.Electrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc

Productivity in the Barents Sea - Response to recent climate variability

The temporal and spatial dynamics of primary and secondary biomass/production in the Barents Sea since the late 1990s are examined using remote sensing data, observations and a coupled physical-biological model. Field observations of mesozooplankton biomass, and chlorophyll a data from transects (different seasons) and large-scale surveys (autumn) were used for validation of the remote sensing products and modeling results. The validation showed that satellite data are well suited to study temporal and spatial dynamics of chlorophyll a in the Barents Sea and that the model is an essential tool for secondary production estimates. Temperature, open water area, chlorophyll a, and zooplankton biomass show large interannual variations in the Barents Sea. The climatic variability is strongest in the northern and eastern parts. The moderate increase in net primary production evident in this study is likely an ecosystem response to changes in climate during the same period. Increased open water area and duration of open water season, which are related to elevated temperatures, appear to be the key drivers of the changes in annual net primary production that has occurred in the northern and eastern areas of this ecosystem. The temporal and spatial variability in zooplankton biomass appears to be controlled largely by predation pressure. In the southeastern Barents Sea, statistically significant linkages were observed between chlorophyll a and zooplankton biomass, as well as between net primary production and fish biomass, indicating bottom-up trophic interactions in this region