نتایج جستجو برای: marine environmen
تعداد نتایج: 93154 فیلتر نتایج به سال:
Many studies have examined the effects of surface topography on the settlement behaviour of marine organisms and this article reviews these investigations with more emphasis on the effects of topography scale. It has been observed that macro topographies (1-100 mm) are generally favoured by marine fouling taxa and are unsuitable for antifouling applications. This is because macro topographies a...
Until recently, little attention has been paid to the existence of kin structure in the sea, despite the fact that many marine organisms are sessile or sedentary. This lack of attention to kin structure, and its impacts on social evolution, historically stems from the pervasive assumption that the dispersal of gametes and larvae is almost always sufficient to prevent any persistent associations...
The natural barriers to species invasions that exist in isolated marine environments such as Hawaii are overcome by anthropogenic influences on the dispersal patterns of marine organisms. This creates a situation where the marine habitats of the Hawaiian Archipelago are more readily exposed to marine non-indigenous species. A case study of a particular anthropogenic dispersal mode, maritime ves...
background: the persian gulf is a suitable habitat for various types of marine species. this study was conducted with the aim of determining the epidemiology and clinical findings of injuries inflicted by marine creatures in the persian gulf, south iran. methods: in this retrospective cross-sectional study, medical records of patients with diagnosis of marine animal exposures treated at 6 refer...
persistent organic pollutants (pops) have widely aroused public concern due to their ubiquity,environmental persistence, long-range transportability, bioaccumulation capacities and potentially adverse effectson living organisms. dakar is located in the industrial zone of senegal (80% of industrial activities) and inhabits25% of senegalese population leading to an ideal sink of these persistent ...
background and objectives: mortality is highly variable within population of cultured fish due to virulent bacteria causing fish septicemia. the use of nano-silver marine fungal chitosan as antibiotic synergisers could be an alternative in the treatment of sepsis fish pathogens. materials and methods: different bulk chitosan solutions were prepared from the mycelia of four marine fungi ( asperg...
Background: Marine life has long been used for their bioactive compounds. Several amazing compounds with different biological activities have so far been identified in tunicates. The aim of the current study was to evaluate the antimicrobial activity of tunichrome released from phallusia nigra marine tunicates collected from Bushehr province coasts, against four strains of Staphylococcus aure...
The main objective of this paper is to provide an applied algorithm for analyzing propeller-shaft vibrations in marine vessels. Firstly an underwater marine vehicle has been analyzed at different speed in unsteady condition using the finite volume method. Based on the results of this analysis, flow field of marine vehicle (wake of stern) and velocity inlet to the marine propeller is extra...
leukemia is a blood disease which is caused by the inhibition of differentiation and an increased proliferation rate. nature has been known as a rich source of medically useful substances. high diversity of bioactive molecules extracted from marine invertebrates, makes them ideal candidates for cancer researches. the study has been done to investigate cytotoxic effects of dichloromethane brittl...
the increasing world demand for fish cannot be met by capture fisheries. aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. the design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. each design is site-specific and knowledge of the topography, wind force and direction, p...
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