نتایج جستجو برای: using strontium stable isotope analysis therefore
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The reported study investigated spatio-temporal variations in the concentrations and stable isotope ratios of C and N in both suspended and infiltrated sediment and traced potential sources of sediment using sediment stable isotope and C/N ratios in the River Enziwigger watershed in Switzerland during a brown trout spawning season. Although similar approaches have been used i...
recent studies in scientific education as well as foreign and second language instruction suggest that thinking has rarely been an integral part of education and training in classroom. some scholars decried the lack of emphasis on thinking in the institutes and schools. they noted that memorization and drills were rewarded,while inquiry, reflection, and consideration of alternatives were frowne...
Most researchers assume minimal impact of pretreatment on strontium isotope ratios ( 87 Sr/ 86 Sr) for bones and teeth, methods vary tremendously. We compared 14 methods, including no prep other than powdering enamel, ashing, soaking in water, an oxidizing agent (bleach or hydrogen peroxide) acetic acid (0.1 M, 1.0 M buffered with calcium acetate), a combination these steps. prepared analyzed a...
Abrupt first-order shifts in strontium and phosphorus concentrations in stalagmite calcite deposited in western Ireland during the 8200-year event (the major cooling episode 8200 years before the present) are interpreted as responses to a drier climate lasting about 37 years. Both shifts are centered on 8330 +/- 80 years before the present, coinciding with a large oxygen isotope anomaly and a c...
The last 500 million years of the strontium-isotope record are shown to correlate significantly with the concurrent record of isotopic fractionation between inorganic and organic carbon after the effects of recycled sediment are removed from the strontium signal. The correlation is shown to result from the common dependence of both signals on weathering and magmatic processes. Because the long-...
The reported study investigated spatio-temporal variations in the concentrations and stable isotope ratios of C and N in both suspended and infiltrated sediment and traced potential sources of sediment using sediment stable isotope and C/N ratios in the River Enziwigger watershed in Switzerland during a brown trout spawning season. Although similar approaches have been used i...
BACKGROUND The natural ratios of carbon (C), nitrogen (N), and sulfur (S) stable isotopes can be varied in some specific living organisms owing to various isotopic fractionation processes in nature. Therefore, the analysis of C, N, and S stable isotope ratios in ginseng can provide a feasible method for determining ginseng authenticity depending on the cultivation land and type of fertilizer. ...
the present study reports an analysis of response articles in four different disciplines in the social sciences, i.e., linguistics, english for specific purposes (esp), accounting, and psychology. the study has three phases: micro analysis, macro analysis, and e-mail interview. the results of the micro analysis indicate that a three-level linguistic pattern is used by the writers in order to cr...
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