نتایج جستجو برای: seas and lakes
تعداد نتایج: 16831594 فیلتر نتایج به سال:
Cassini radar images show a variety of fluvial channels on Titan’s surface, often several hundreds of kilometers in length. Some (predominantly at lowand mid-latitude) are radar-bright and braided, resembling desert washes where fines have been removed by energetic surface liquid flow, presumably from methane rainstorms. Others (predominantly at high latitudes) are radar-dark and meandering and...
Flatworms are one of the most diverse groups within Lophotrochozoa with more than 20,000 known species, distributed worldwide in different ecosystems, from the free-living organisms in the seas and lakes to highly specialized parasites living in a variety of hosts, including humans. Several infections caused by flatworms are considered major neglected diseases affecting countries in the America...
Plankton samples were collected from six remote freshwater and saline lakes located at altitudes of 3,204 to 4,718 m and 1,000 km apart within an area of ca. 1 million km(2) on the eastern Tibetan Plateau to comparatively assess how environmental factors influence the diversity of bacterial communities in high-altitude lakes. The composition of the bacterioplankton was investigated by analysis ...
were an order of magnitude higher than those required In the molecular drama of apoptotic cell death, perhaps to activate caspases in cell extracts (0.2–0.5 mM). Intact there is no character stranger than cytochrome c. This cells thus seem to have a way to regulate or suppress the familiar heme protein can be transformed, in Jekyll and response to cytosolic cytochrome c. When apoptosis is Hyde ...
The equilibrium redistributive policy proposals of two parties with policy preferences is studied. Each party’s ideal policy coincides with that of citizens having a particular income level, and the party’s utility function reflects its attitude to the trade-off between choice of preferred policy and likelihood of victory. When parties face uncertainty about citizens’ abstention from voting, di...
Recent simulations have indicated that vinyl cyanide is the best candidate molecule for the formation of cell membranes/vesicle structures in Titan's hydrocarbon-rich lakes and seas. Although the existence of vinyl cyanide (C2H3CN) on Titan was previously inferred using Cassini mass spectrometry, a definitive detection has been lacking until now. We report the first spectroscopic detection of v...
Studies of phosphorus (P) dynamics in surface sediments of lakes and coastal seas typically emphasize the role of coupled iron (Fe), sulfur (S) and P cycling for sediment P burial and release. Here, we show that anaerobic oxidation of methane (AOM) also may impact sediment P cycling in such systems. Using porewater and sediment profiles for sites in an oligotrophic coastal basin (Bothnian Sea),...
The transport mechanisms of substances in natural water bodies are considered. Dissolved substances can be regarded as passive in that they do not affect the velocity field of the water bodies. The particles of substances can be regarded as either passive or active. Transport of substances is caused by convection, and/or molecular and turbulent diffusion. The buoyancy forces thus have some infl...
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