The gastric pathogen Helicobacter pylori utilize glucose during metabolism, but the underlying mechanisms linking to oxygen-18 ((18)O) and carbon-13 ((13)C)-isotopic fractionations of breath CO2 during glucose metabolism are poorly understood. Using the excretion dynamics of (18)O/(16)O and (13)C/(12)C-isotope ratios of breath CO2, we found that individuals with Helicobacter pylori infections e...

Hydrogen isotope ratios (2H/H or D/H) of long-chain unsaturated ketones (alkenones) preserved in lake and marine sediments hold great promise for paleoclimate studies. However, compound-specific hydrogen isotope analysis of individual alkenones has not been possible due to chromatographic coelution of alkenones with the same carbon chain length but different numbers of double bonds. Published s...

By using angle-resolved photoemission spectroscopy (ARPES) combined with the first-principles electronic structure calculations, we report quantized states at surface of a single crystal 2H-TaSe2. We have observed sub-bands three-dimensional Brillouin zone center due to highly dispersive band light effective mass along kz direction. The shift upward towards EF while bulk Γ shifts downward decre...

We explore a method to probe new long- and intermediate-range interactions using precision atomic isotope shift spectroscopy. We develop a formalism to interpret linear King plots as bounds on new physics with minimal theory inputs. We focus only on bounding the new physics contributions that can be calculated independently of the standard model nuclear effects. We apply our method to existing ...

A. Krieger1, Ch. Geppert1,2, R.M. Sánchez2, M.L. Bissell3, K. Blaum4, N. Frömmgen1, M. Hammen1, M. Kowalska5, J. Krämer1, K. Kreim4, R. Neugart1, C. Novotny1,2, D.T. Yordanov4, and W. Nörtershäuser1,2 1Institut für Kernchemie, Universität Mainz, Germany; 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany; 3Instituut voor Kern-en Stralingsfysica, Katholieke Universiteit ,Leu...

Carbon dioxide production, water production, and energy expenditure (EE) determined with 2H2(18)O were validated using a room calorimeter. Nine human subjects (5 males, 4 females) resided in the calorimeter for five to seven consecutive 23.5-h days. Daily carbon dioxide and water production and EE were averaged from calorimeter data and compared with 2H2(18)O results for the same period and for...

Slope stability strongly depends on the prevailing hydrological and hydrogeological conditions. The amount intensity of precipitation changing groundwater levels are important landslide triggering factors. Environmental tracers, including chemical stable isotope compositions groundwater, were used to gain insight into dynamics Urbas landslide. is situated in a mountainous area with steep slopes...

The end-Permian extinction is typically ascribed to massive volcanic eruptions, but direct geochemical evidence linking the two independent events is generally lacking. Zinc is an important micronutrient of marine phytoplanktons, and Zn isotope (d66Zn) ratios of seawater are markedly higher than those of volcanic rocks and riverine waters. We conducted high-resolution Zn concentration and Zn is...

The identification of recharge areas in karst aquifers allows us to perform sustainable management these groundwater resources. Stable isotopes (?18O and ?2H) have been largely used provide information about elevation many mountainous regions. In this paper, an improved version a recent “isotope-driven model”, for the areas, was applied Capodacqua di Spigno Spring (south Latium region). model u...

The hydrochemical and isotopic techniques have become one of the most popular successful methods for determining hydrogeochemical features groundwater in recent years. A total 15 samples were collected during wet (March, 2021) dry (August, seasons. An approach with major elements (Cl-, Na+, Mg2+, Ca2+, SO4 2=) multi-isotope (2H, 18O) are used this study to solve geochemical variation salinity B...