منابع مشابه
Modeling variations of marine reservoir ages during the last 45 000 years
When dating marine samples with 14 C, the reservoir-age effect is usually assumed to be constant, although atmospheric 14 C production rate and ocean circulation changes cause temporal and spatial reservoir-age variations. These lead to dating errors, which can limit the interpretation of cause and effect in paleoclimate data. We used a 5 global ocean circulation model forced by transient atmos...
متن کاملMeasurements of the Marine Reservoir Effect on Radiocarbon Ages in the Eastern Bering Sea
The marine reservoir effect is known to skew radiocarbon dating (marine samples appear “older” than terrestrial samples of equivalent age), but the magnitude of this effect is not the same in all locations. Carbon-14 age determinations from 23 paired samples of terrestrial and marine origin are presented for five areas around the northern and eastern Bering Sea. It appears statistically suitabl...
متن کاملHow Does Calcium Oscillate?
Ca2+ is the most important second messenger in living cells serving as a critical link between a variety of extracellular stimuli and their intraand intercellular responses. The external signals are translated most often into repeated increases of the cytosolic Ca2+ concentration. Due to their importance and frequent appearance, Ca2+ oscillations have been extensively studied in experiments and...
متن کاملDecomposition of 14C-labeled organic substances in marine sediments’
The depth variation of total organic carbon (TOC), organic matter composition, and porewater composition in marine sediments suggests that different components of the organic matter undergo decomposition at widely different rates. The decomposition of 14C-labeled organic substances was followed in sediment microcosms in the laboratory. The substances used were chosen to simulate a portion of ma...
متن کاملCounterregulatory hormones oscillate during steady-state hypoglycemia.
During hypoglycemia, the magnitude of the counterregulatory response depends on the extent of plasma glucose reduction. However, our clinical observations during steady-state hypoglycemia indicate that symptom severity can change independently of plasma glucose concentrations, i.e., symptoms appeared to fluctuate despite stable glucose levels. This study was therefore designed to test the hypot...
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ژورنال
عنوان ژورنال: PAGES news
سال: 2006
ISSN: 1563-0803,1563-0803
DOI: 10.22498/pages.14.3.18