3,595 research outputs found
KvÌlstofforsyning ved biologisk kvÌlstofbinding. II. Symbiotisk N2-binding og kvÌlstofgødskning af frøbÌlgplanter
Designing New Materials for Ammonia Storage Using Density Functional Theory and Genetic Algorithms
Designing mixed metal halide ammines for ammonia storage using density functional theory and genetic algorithms
New superior ammonia storage materials are suggested from computational screening. Global optimum of 27â000 mixtures identified testing only âź1.5% of the candidates, proving the success of the genetic algorithm.</p
Neuron-derived extracellular vesicles in blood reveal effects of exercise in Alzheimer's disease
Carriage of an ACME II variant may have contributed to methicillin-resistant staphylococcus aureus sequence type 239-like strain replacement in Liverpool hospital, Sydney, Australia
Approximately 39% of methicillin-resistant Staphylococcus aureus (MRSA) sequence type 239 (ST239)-like bloodstream isolates from Liverpool Hospital (obtained between 1997 and 2008) carry an arginine catabolic mobile element (ACME). Whole-genome sequencing revealed that an ACME II variant is located between orfX and SCCmec III, and based on pulsed-field gel electrophoresis patterns and temporal relationships of all ST239-like isolates (n = 360), ACME carriage may have contributed to subpulsotype strain replacement
112 Presence of bacteria in the endometrium and oviduct of cows with pyometra as detected by flourescence in situ hybridization
Evidence of Isotopic Fractionation During Vapor Exchange Between the Atmosphere and the Snow Surface in Greenland
Several recent studies from both Greenland and Antarctica have reported significant changes in the water isotopic composition of nearâsurface snow between precipitation events. These changes have been linked to isotopic exchange with atmospheric water vapor and sublimationâinduced fractionation, but the processes are poorly constrained by observations. Understanding and quantifying these processes are crucial to both the interpretation of ice core climate proxies and the formulation of isotopeâenabled general circulation models. Here, we present continuous measurements of the water isotopic composition in surface snow and atmospheric vapor together with nearâsurface atmospheric turbulence and snowâair latent and sensible heat fluxes, obtained at the East Greenland IceâCore Project drilling site in summer 2016. For two 4âdayâlong time periods, significant diurnal variations in atmospheric water isotopologues are observed. A model is developed to explore the impact of this variability on the surface snow isotopic composition. Our model suggests that the snow isotopic composition in the upper subcentimeter of the snow exhibits a diurnal variation with amplitudes in δ18O and δD of ~2.5â° and ~13â°, respectively. As comparison, such changes correspond to 10â20% of the magnitude of seasonal changes in interior Greenland snow pack isotopes and of the change across a glacialâinterglacial transition. Importantly, our observation and model results suggest, that sublimationâinduced fractionation needs to be included in simulations of exchanges between the vapor and the snow surface on diurnal timescales during summer cloudâfree conditions in northeast Greenland
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