We report on methane (CH4) stable isotope (?13C and ?2H) measurements from landfast sea ice collected near Barrow (Utqiagvik, Alaska) Cape Evans (Antarctica) over the winter-to-spring transition. These provide novel insights into pathways of CH4 production consumption in ice. found substantial differences between two sites. Sea overlying shallow shelf was supersaturated with a clear microbial o...

The results and main steps of an analytic calculation of radiative-recoil corrections of order α(Zα)5(m/M)m to the Lamb shift in hydrogen are presented. The calculations are performed in the infrared safe Yennie gauge. The discrepancy between two previous numerical calculations of these corrections existing in the literature is resolved. Our new result eliminates the largest source of the theor...

DNA-based stable isotope probing (SIP) is a novel technique for the identification of organisms actively assimilating isotopically labeled compounds. Herein, we define the limitations to using 15N-labeled substrates for SIP and propose modifications to compensate for these shortcomings. Changes in DNA buoyant density (BD) resulting from 15N incorporation were determined using cultures of dispar...

This experiment is an exercise in optical spectroscopy in a study of the spectra of “hydrogenic” atoms, i.e. atoms with one “optical” electron outside a closed shell of other electrons. Measurements include finding: the Balmer lines of atomic hydrogen and the fine structure of sodium lines; determination of the mass of the deuteron from the isotope shift. A high-resolution scanning monochromato...

Hydrogen isotope ratios are sensitive tracers of the water cycle with potential to constrain timing mountain building episodes in geologic past. This study presents hydrogen (2H/1H or δ2H) n-alkanes derived from leaf wax terrestrial plants, collected trees and soils along an east–west transect across Cascade range Washington State, USA. Along this transect, δ2H values (δ2Halkane) surface gymnos...

Patterns of stable isotopes water (18O and 2H) in precipitation have been used as tracers for analyzing environmental processes which can be changed by factors such the topography or meteorological variables. In this study, we investigated isotopic data one year low mountain range North Hesse, Germany, analyzed mainly altitude, rainfall amount, air temperature effects on a regional scale. The r...