Sentences with phrase «calculate isotope ratios»
«Oxygen in the water that mammals drink is preserved in the phosphate in their teeth, so these can be used to calculate isotope ratios.
http://www.sciencemag.org/ Not exact matches
The calorie reductions were calculated individually through the ratio of isotopes absorbed by the participants» molecules and tissues over 2 weeks, a technique that accurately pinpoints a weight - maintenance calorie level.
Next, Agee and his colleagues used a laser to extract water molecules trapped within minerals in the meteorite and fed them into a mass spectrometer to calculate the ratio of deuterium, a heavy isotope of hydrogen, to ordinary hydrogen.
The ratio between quantities of different isotopes provides the data for an equation that calculates the age.
For example, based on the isotope ratios they detected in cow rumen, they calculated that this methane formed at 400 degrees Celsius — impossible, as cow stomachs are typically about 40 C.
The new findings on Arctic Ocean salinity conditions in the Eocene were calculated in part by comparing ratios of oxygen isotopes locked in ancient shark teeth found in sediments on Banks Island in the Arctic Circle and incorporating the data into a salinity model.
Second, the quantity of methane necessary to explain the carbon isotope ratio, as calculated by Dickens, would be much less than that required to warm ocean and atmosphere temperatures to the extent estimated by PETM temperature proxies and calculated by physical climate models.
Based on the isotope ratios they detected in cow rumen, they calculated that this methane formed at 400 degrees Celsius (752 degrees Fahrenheit).