Results 41 to 50 of about 12,174,017 (385)

Nitrogen isotope effects can be used to diagnose N transformations in wastewater anammox systems

Scientific Reports, 2021
Anaerobic ammonium oxidation (anammox) plays an important role in aquatic systems as a sink of bioavailable nitrogen (N), and in engineered processes by removing ammonium from wastewater.
Paul M. Magyar, Damian Hausherr, Robert Niederdorfer, Nicolas Stöcklin, Jing Wei, Joachim Mohn, Helmut Bürgmann, Adriano Joss, Moritz F. Lehmann   +8 more
doaj   +1 more source

Ab initio simulations of hydrogen-bonded ferroelectrics: collective tunneling and the origin of geometrical isotope effects

, 2013
Ab initio simulations that account for nuclear quantum effects have been used to examine the order-disorder transition in squaric acid, a prototypical H-bonded antiferroelectric crystal.
Michaelides, A., Wikfeldt, K. T.
core   +1 more source

The effectiveness of using carbonate isotope measurements of body tissues to infer diet in human evolution: Evidence from wild western chimpanzees (Pan troglodytes verus)* [PDF]

, 2015
Changes in diet throughout hominin evolution have been linked with important evolutionary changes. Stable carbon isotope analysis of inorganic apatite carbonate is the main isotopic method used to reconstruct fossil hominin diets; to test its ...
Boesch, Christophe, Fahy, Geraldine, Hublin, Jean-Jacques, Richards, Michael P.   +3 more
core   +1 more source

Magnetic isotope effect [PDF]

Nature, 1990
The electron spin selectivity of radical reactions is accompanied by nuclear spin selectivity, i.e., sorting of the isotopic nuclei relative to their magnetic moment. This property of spin-selective reactions produces separation of magnetic and nonmagnetic isotopes known as the magnetic isotope effect.
EUGENII N. STEP, VALERII F. TARASOV, ANATOLII L. BUCHACHENKO   +2 more
openaire   +1 more source

Sulfur Isotope Effects of Dissimilatory Sulfite Reductase

bioRxiv, 2015
The precise interpretation of environmental sulfur isotope records requires a quantitative understanding of the biochemical controls on sulfur isotope fractionation by the principle isotope-fractionating process within the S cycle, microbial sulfate ...
W. Leavitt, A. Bradley, A. A. Santos, I. Pereira, D. Johnston   +4 more
semanticscholar   +1 more source

Isotope effect in superconductors with coexisting interactions of phonon and nonphonon mechanisms

, 2003
We examine the isotope effect of superconductivity in systems with coexisting interactions of phonon and nonphonon mechanisms in addition to the direct Coulomb interaction.
Anderson P. W., Beal-Monod M. T., Crawford M. K., Emery V. J., Foulkes I. F., Heidmann C.-P., Ishiguro T., Ito H., Kikugawa N., Kini A. M., Klein B. M., Kuwabara T., Maeno Y., Mao Z. Q., Miyake K., Oguchi T., Oshima K., Rice T. M., Scalapino D. J., Schlueter J. A., Shimahara H., Shimahara H., Shimahara H., Shimahara H., Shimahara H., Tokumoto M., Yamaji K.   +26 more
core   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Light oxygen isotopic composition in deep mantle reveals oceanic crust subduction before 3.3 billion years ago

Communications Earth & Environment
Compositional heterogeneity exists in Earth’s deep mantle, which can be caused by the subduction of oceanic slabs. How early this process started on Earth remains highly debated due to the scarcity of early Archean materials with pristine mantle ...
Dongjian Ouyang, Huiming Bao, Gary R. Byerly, Qiuli Li   +3 more
doaj   +1 more source

Shifts in rotifer life history in response to stable isotope enrichment: testing theories of isotope effects on organismal growth [PDF]

Royal Society Open Science, 2017
In ecology, stable isotope labelling is commonly used for tracing material transfer in trophic interactions, nutrient budgets and biogeochemical processes.
Elena Gorokhova
doaj   +1 more source

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source