نتایج جستجو برای: environmental isotopes
تعداد نتایج: 393385 فیلتر نتایج به سال:
Reconstructing environments around archaeological sites is complicated by past land management practices and regional-scale climate proxies that can be contradictory are often located at a distance from the themselves. Here we explore environmental information fossil snail shells which, even when few in number on an site, may prove invaluable constructing site-specific data. The palaeoecology o...
12 Hydrogenetic ferromanganese crusts are iron-manganese oxide chemical 13 precipitates on the seafloor that grow over periods of tens of millions of years. Their 14 secular records of chemical, mineralogical, and textural variations are archives of deep15 sea environmental changes. However, environmental reconstruction requires reliable 16 high-resolution age dating. Earlier chronological meth...
The problem of utilization of high-activity waste by effect of nuclear transmutation in growing associations of microbiological cultures was studied. For the first time we have observed utilization of several kinds of highly active isotopes in the volume of distilled water extracted from the first contour of water-water atomic reactor convert to non-radioactive nuclei. 1. The model and the foun...
The Archean-Proterozoic transition is characterized by the widespread deposition of organic-rich shale, sedimentary iron formation, glacial diamictite, and marine carbonates recording profound carbon isotope anomalies, but notably lacks bedded evaporites. All deposits refl ect environmental changes in oceanic and atmospheric redox states, in part associated with Earth’s earliest ice ages. Time-...
Terms such as isotopes and nuclear techniques often call to mind basic research of little or only minor practical importance for animal productivity and health. This is, however, not true. No other scientific tools have in our lifetime been of a significance equalling that of the isotopes in widening our insight into animal physiology and nutritional requirements. Last but not least, they have ...
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