Results 91 to 100 of about 255,270 (305)

Quantum Indistinguishability in Chemical Reactions [PDF]

, 2017
Quantum indistinguishability plays a crucial role in many low-energy physical phenomena, from quantum fluids to molecular spectroscopy. It is, however, typically ignored in most high temperature processes, particularly for ionic coordinates, implicitly ...
Fisher, Matthew P. A., Radzihovsky, Leo
core   +3 more sources

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Proposal for International Agreement on Ca Notation resulting from discussion at workshops on stable isotope measurement held in Davos (Goldschmidt 2002) and Nice (EGS-AGU-EUG 2003) [PDF]

, 2004
A proposal is made to standardise the reporting of Ca isotope data to the δ44Ca/40Ca notation (or δ44Ca/42Ca) and to adopt NIST SRM 915a as the reference ...
Bock, Barbara, Eisenhauer, Anton, Fietzke, Jan, Gussone, Nikolaus, Hippler, Dorothee, Kramers, Jan, Nägler, Thomas F., Schmitt, Anne-Désirée, Stille, Peter   +8 more
core   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Soil Phosphorus Fraction Characteristics in Different Alpine Grassland Types of the Qinghai–Tibet Plateau

Agronomy
The alpine grassland ecosystem of the Tibetan Plateau is a vital base for animal husbandry and a key ecological security barrier in China. Phosphorus (P), an essential nutrient, is among the primary factors limiting grassland productivity.
Xueting Li, Zhan Liu, Cuilan Li, Ning Zong, Nianpeng He, Zhiyuan Cao, Jinjing Zhang   +6 more
doaj   +1 more source

Chemical Leaching of Metals from Landfill's Fine Fraction

, 2020
Leaching of heavy metals (chromium, zinc, copper) from the fine fraction of the Torma landfill (Estonia) was investigated. The leaching kinetics studies have determined the dependence of some metal’s concentration on the leaching time. Metals were leached with Aqua Regia, distilled water and EDTA (Ethylenediaminetetraacetic acid); process was most ...
Balkauskaitė, E., Bučinskas, A., Ivanauskas, R., Kriipsalu, M., Denafas, G.   +4 more
openaire   +1 more source

New solar metallicity measurements

, 2019
In the past years, a systematic downward revision of the metallicity of the Sun has led to the "solar modeling problem", namely the disagreement between predictions of standard solar models and inferences from helioseismology.
Vagnozzi, Sunny
core   +1 more source

Applications of Abundance Data and Requirements for Cosmochemical Modeling [PDF]

, 2001
Understanding the evolution of the universe from Big Bang to its present state requires an understanding of the evolution of the abundances of the elements and isotopes in galaxies, stars, the interstellar medium, the Sun and the heliosphere, planets and
Binns, W. R., Busemann, H., Chiappini, C., Gloeckler, G., Hoppe, P., Kirilova, D., Leske, R. A., Manuel, O. K., Mewaldt, R. A., Möbius, E., Wieler, R., Wiens, R. C., Wimmer-Schweingruber, R. F., Yanasak, N. E.   +13 more
core   +2 more sources

Valosin‐containing protein counteracts ATP‐driven dissolution of FUS condensates through its ATPase activity in vitro

FEBS Letters, EarlyView.
Biomolecular condensates formed by fused in sarcoma (FUS) are dissolved by high ATP concentrations yet persist in cells. Using a reconstituted system, we demonstrate that valosin‐containing protein (VCP), an AAA+ ATPase, counteracts ATP‐driven dissolution of FUS condensates through its D2 ATPase activity.
Hitomi Kimura, Shin‐ichi Tate, Kyota Yasuda   +2 more
wiley   +1 more source

Effect of chloride on the chemical conversion of nitrate to nitrous oxide for δ15N analysis [PDF]

, 2009
We investigate the influence of chloride concentration on the performance of the chemical reduction method for measurement of the nitrogen isotopic ratio (δ15N) in NO3− in natural waters (McIlvin and Altabet, 2005).
Altabet, Mark A., Ryabenko, Evgeniya, Wallace, Douglas W.R.   +2 more
core   +1 more source