نتایج جستجو برای: marine environmen
تعداد نتایج: 93154 فیلتر نتایج به سال:
چکیده: حمل و نقل دریایی ار آنجا صاحب اهمیت شده است که بیشتر کره زمین را آب فراگرفته و تا پیشرفت علم تنها وسیله ارتباطی جوامع دریا و خشکی بوده است حمل و نقل دریایی ار اهمیت بسیاری برخوردار شده است به طوری که از راه دریا بیش از 80% از کل تجارت جهان صورت می پذیرد؛ اما این امر با مشکلات بسیاری به خصوص از لحاظ اجرایی روبرو بوده است ؛ به این دلیل و بسیاری از دلایل دیگر، مراکز مرتبط با حمل و نقل دریا...
the spanish turbot aquaculture sector holds a top position in the international market. thisactivity is mainly developed along the galician coast (nw spain). this article evaluates the environmentalperformance of galician turbot aquaculture according to the life cycle assessment (lca) methodology.previously, on account of the expected relevance of feed for aquaculture, marine aquafeed productio...
the potential of marine actinobacteria particularly streptomyces as a single cell protein (scp) feed for the growth of ornamental fish, xiphophorus helleri has been investigated. the streptomyces strains used as scp were isolated from the marine sponges, namely callyspongia diffusa , mycale mytilorum , tedania anhelans and dysidea fragilis . six scp feeds were prepared and their effects were co...
In 2001, the Canadian Councils of Resource Ministers (CCRM) named biodiversity reporting as a priority. As a result, the Biodiversity Outcomes Framework was developed to identify and link current and future priorities related to sustaining Canadian biodiversity, to engage Canadians on the planning and implementation of these priorities, and to report on progress. In 2006, the CCRM identified th...
Significant warming has been observed in every ocean, yet our ability to predict the consequences of oceanic warming on marine biodiversity remains poor. Experiments have been severely limited because, until now, it has not been possible to manipulate seawater temperature in a consistent manner across a range of marine habitats. We constructed a "hot-plate" system to directly examine ecological...
Introduced marine species are a major environmental and economic problem. The rate of these biological invasions has substantially increased in recent years due to the globalization of the world's economies. The damage caused by invasive species is often a result of the higher densities and larger sizes they attain compared to where they are native. A prominent hypothesis explaining the success...
1 Cancer and Inflammation Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, National Cancer Institute, Frederick, Maryland, United States of America, 2 Sackler Institute of Molecular Medicine, Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel, 3 University of Virginia, Charlottesvill...
Although the prevailing paradigm has held that the polar night is a period of biological quiescence, recent studies have detected noticeable activity levels in marine organisms. In this study, we investigated the circadian rhythm of the scallop Chlamys islandica by continuously recording the animal's behaviour over 3 years in the Arctic (Svalbard). Our results showed that a circadian rhythm per...
BACKGROUND Correct identification and cryptic biodiversity revelation for marine organisms are pressing since the marine life is important in maintaining the balance of ecological system and is facing the problem of biodiversity crisis or food safety. DNA barcoding has been proved successful to provide resolution beyond the boundaries of morphological information. Nassarius, the common mudsnail...
Abstract It is well known that sediment and mussel samples are commonly used for monitoring of radioactivity levels in marine ecosystem. In the present study, radioactivity concentrations of Cs, K, Th, U and Po were measured in sediment and mussel (Mytilus galloprovincialis) samples. The results of the present study were compared with the similar studies.
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