Sentences with phrase «ice under vacuum»
The method used to determine the isotopic ratios in ice core gases is by sublimating all ice under vacuum over a cryogenic trap and subsequent sublimating all ingredients step by step.
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Frozen in ice under ultraviolet radiation, high vacuum and low temperature, the pyrimidine turned into uracil, cytosine and thymine, major components of earthly DNA and RNA.
In Grenoble, on every depth level one to three samples of about 40 g of ice are crushed under vacuum conditions.
At closing depth, direct in - situ measurements of CO2 in firn, thus of still open bubbles, and from ice, thus already fully closed bubbles, via the normal route of drilling ice, transport, crushing under vacuum, measuring the levels, both show the same CO2 levels.
The main problem in deep ice cores is the formation of clathrates, where CO2 (and N2 or O2) can hide, even if crushed under vacuum.