GOLDSTEIN, LEON, AND KOY P. FORSTER. Osmoregulation and urea metabolism in the little skate Raja erinacea. Am. J. Physiol. 220(3) : 742-746. 197 1 .-Little skates, Raja erinacea, were transferred gradually (4 days) from full to approximately half-strength seawater. Steady-state conditions (with respect to solute and water balance) were established by the end of the dilution program. The skates ...

We tested the effects of UV radiation (UVR) and nitrate limitation on the production of dimethylsulfide (DMS), particulate dimethylsulfoniopropionate (DMSPp), and particulate dimethylsulfoxide (DMSOp) in natural seawater from the Gulf of Mexico and in phytoplankton cultures. DMS/Chl a ratios in PAR-only and PAR + UV-exposed seawater were 0.44–2.0 and 0.46–1.9 nmol DMS mg 1 Chl a, respectively, ...

In an attempt to reduce the threat of global warming, it has been proposed that the rise of atmospheric carbon dioxide concentrations be reduced by the ocean disposal of CO2 from the flue gases of fossil fuel-fired power plants. The release of large amounts of CO2 into mid or deep ocean waters will result in large plumes of acidified seawater with pH values ranging from 6 to 8. In an effort to ...

An epoxy-impregnated graphite tube composite electrode bulk modified with 2-mercaptobenzoxazole was fabricated and employed for the determination of gold. A differential-pulse cathodic stripping procedure in conjunction with either continuous flow or flow injection was developed. Both open and closed circuit accumulation of Au(iii) were investigated. The addition of Rhodamine 6G to the accumula...

Po is concentrated in most marine organisms by factors of 10-10 relative to seawater concentration and its accumulation varies from one tissue to another, according to the capacity to concentrate polonium (Carvalho, 1988). This radionuclide gives rise to almost 7% of the dose equivalent, through natural radiation intake (UNSC, 1988) and about 77% of daily intake comes from solid food, mainly se...

Ocean acidification (OA) results in reduced seawater pH and aragonite saturation state (Ωarag), but also reduced seawater buffer capacity. As buffer capacity decreases, diel variation in seawater chemistry increases. However, a variety of ecosystem feedbacks can modulate changes in both average seawater chemistry and diel seawater chemistry variation. Here we model these effects for a coastal, ...

GOLDSTEIN, LEON, AND KOY P. FORSTER. Osmoregulation and urea metabolism in the little skate Raja erinacea. Am. J. Physiol. 220(3) : 742-746. 197 1 .-Little skates, Raja erinacea, were transferred gradually (4 days) from full to approximately half-strength seawater. Steady-state conditions (with respect to solute and water balance) were established by the end of the dilution program. The skates ...

Ž . The purpose of this study was to find the minimum inhibitory concentrations MIC for the following antibacterial agents: chloramphenicol, florfenicol, flumequine and the combination Ž . trimethoprimrsulfadiazine to bacteria associated with scallop Pecten maximus larvae. To evaluate possible effects of components in seawater to the antimicrobial activity of these agents, MIC values were estab...

The Champagne Hot Springs (CHS) shallow submarine hydrothermal system is located along the submerged flank of the Plat Pays volcanic system on the southwest section of the island of Dominica, Lesser Antilles. We have conducted a detailed geochemical study of the hydrothermal system, with the objectives to investigate the source of the hydrothermal fluids and gases, their effect on sediment and ...

Investigation of the effect physical parameters seawater on health branching corals in Chabahar Bay