381 research outputs found
Houting in het IJsselmeergebied. Een uitgestorven vis terug?
De oorspronkelijke populatie Noordzeehouting (Coregonus oxyrhynchus) van het Rijnstroomgebied wordt beschouwd als uitgestorven sinds 1939. In 1992 is begonnen met een grootschalig uitzetprogramma van houting in Duitsland op basis van een Deense entpopulatie van de rivier de Vidå die uitmondt in de Noordzee. Hoewel de taxonomische status van houting en andere coregoniden (waaronder grote marene) nog veel onduidelijkheden bevat en aan wetenschappelijke discussie onderhevig is, is deze Deense populatie waarschijnlijk het meest verwant aan de oorspronkelijke houtingpopulatie Voor een adequate bescherming van deze houtingpopulatie is het van belang hoe deze populatie zich verder ontwikkelt, hoe trekpatronen zich ontwikkelen in het Rijnstroomgebied en welke habitats en migratiemogelijkheden daarbij van belang zijn en hoe grootschalige milieuveranderingen en klimaatveranderingen van invloed kunnen zijn op het toekomstig succes van de houting in het Rijnstroomgebied
Fort Malden National Historic Park Archives Guide
Since its establishment in 1941, and particularly during its early years of operation, Fort Malden National Historic Park has acquired variety of manuscript materials, both relevant and irrelevant to its themes. In keeping with the early procedures for the receipt of items into the collections, much of this material is in the form of now untraceable loans, creating potentially permanent custodial situation. Whether thematically relevant or irrelevant, much of the material is historically invaluable and there exists an ethical obligation for its proper care and accessibility to legitimate researchers.https://scholar.uwindsor.ca/swoda-windsor-region/1009/thumbnail.jp
Bijvangsten van salmoniden en overige trekvissen vanuit een populatieperspectief
De huidige studie gaat in op de vraag of de huidige visserijinspanning door bijvangsten het herstel van de zalmpopulatie in de weg staat. De voorliggende rapportage geeft een overzicht van een inventarisatie van bijvangsten van salmoniden en overige trekvissen in zowel de commerciële als de recreatieve visserij in de Nederlandse wateren. Visserijsterfte en overige sterftefactoren worden vervolgens afgezet tegen een populatieschatting waardoor de relatieve impact van visserij in perspectief geplaatst kan worden
Specific protein homeostatic functions of small heat-shock proteins increase lifespan
During aging, oxidized, misfolded, and aggregated proteins accumulate in cells, while the capacity to deal with protein damage declines severely. To cope with the toxicity of damaged proteins, cells rely on protein quality control networks, in particular proteins belonging to the family of heat-shock proteins (HSPs). As safeguards of the cellular proteome, HSPs assist in protein folding and prevent accumulation of damaged, misfolded proteins. Here, we compared the capacity of all Drosophila melanogaster small HSP family members for their ability to assist in refolding stress-denatured substrates and/or to prevent aggregation of disease-associated misfolded proteins. We identified CG14207 as a novel and potent small HSP member that exclusively assisted in HSP70-dependent refolding of stress-denatured proteins. Furthermore, we report that HSP67BC, which has no role in protein refolding, was the most effective small HSP preventing toxic protein aggregation in an HSP70-independent manner. Importantly, overexpression of both CG14207 and HSP67BC in Drosophila leads to a mild increase in lifespan, demonstrating that increased levels of functionally diverse small HSPs can promote longevity in vivo
Stable Atmospheric Boundary Layers and Diurnal Cycles – Challenges for Weather and Climate Models
The representation of the atmospheric boundary layer is an important part of weather and climate models and impacts many applications such as air quality and wind energy. Over the years, the performance in modeling 2-m temperature and 10-m wind speed has improved but errors are still significant. This is in particular the case under clear skies and low wind speed conditions at night as well as during winter in stably stratified conditions over land and ice. In this paper, the authors review these issues and provide an overview of the current understanding and model performance. Results from weather forecast and climate models are used to illustrate the state of the art as well as findings and recommendations from three intercomparison studies held within the Global Energy and Water Exchanges (GEWEX) Atmospheric Boundary Layer Study (GABLS). Within GABLS, the focus has been on the examination of the representation of the stable boundary layer and the diurnal cycle over land in clear-sky conditions. For this purpose, single-column versions of weather and climate models have been compared with observations, research models, and large-eddy simulations. The intercomparison cases are based on observations taken in the Arctic, Kansas, and Cabauw in the Netherlands. From these studies, we find that even for the noncloudy boundary layer important parameterization challenges remain.SB acknowledges the financial support received from the
NationalScience Foundation by way of Grant AGS-1122315
Using negative-latency gravitational wave alerts to detect prompt radio bursts from binary neutron star mergers with the Murchison Widefield Array
We examine how fast radio burst (FRB)-like signals predicted to be generated
during the merger of a binary neutron star (BNS) may be detected in
low-frequency radio observations triggered by the aLIGO/Virgo gravitational
wave detectors. The rapidity, directional accuracy, and sensitivity of
follow-up observations with the Murchison Widefield Array (MWA) are considered.
We show that with current methodology, the rapidity criteria fails for
triggered MWA observations above 136 MHz for BNS mergers within the aLIGO/Virgo
horizon, for which little dispersive delay is expected. A calculation of the
expected reduction in response time by triggering on `negative latency' alerts
from aLIGO/Virgo observations of gravitational waves generated by the BNS
inspiral is presented. This allows for observations up to 300 MHz where the
radio signal is expected to be stronger. To compensate for the poor positional
accuracy expected from these alerts, we propose a new MWA observational mode
that is capable of viewing one quarter of the sky. We show the sensitivity of
this mode is sufficient to detect an FRB-like burst from an event similar to
GW170817 if it occurred during the ongoing aLIGO/Virgo third science run (O3).Comment: Published in MNRAS Letters. 8 pages (5 main + 3 supplemental), 4
figures. Link to article:
https://academic.oup.com/mnrasl/advance-article-abstract/doi/10.1093/mnrasl/slz129/555266
Enabling quantitative data analysis through e-infrastructures
This paper discusses how quantitative data analysis in the social sciences can engage with and exploit an e-Infrastructure. We highlight how a number of activities which are central to quantitative data analysis, referred to as ‘data management’, can benefit from e-infrastructure support. We conclude by discussing how these issues are relevant to the DAMES (Data Management through e-Social Science) research Node, an ongoing project that aims to develop e-Infrastructural resources for quantitative data analysis in the social sciences
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