Results 31 to 40 of about 1,883,366 (248)

Microbial carbon recycling – an underestimated process controlling soil carbon dynamics – Part 1: A long-term laboratory incubation experiment [PDF]

Biogeosciences, 2015
Independent of its chemical structure carbon (C) persists in soil for several decades, controlled by stabilization and recycling. To disentangle the importance of the two factors on the turnover dynamics of soil sugars, an important compound of soil ...
A. Basler, M. Dippold, M. Helfrich, J. Dyckmans   +3 more
doaj   +1 more source

An evaluation of migration fidelity of Ruby-throated Hummingbirds inferred from stable isotope methods [PDF]

PeerJ
Knowledge of spatial connectivity between breeding and non-breeding locations of migratory birds and their breeding site fidelity are important for avian conservation.
Geoff Koehler, Kevin J. Kardynal, Ron E. Jensen, Keith A. Hobson   +3 more
doaj   +2 more sources

Microbial carbon recycling: an underestimated process controlling soil carbon dynamics – Part 2: A C₃-C₄ vegetation change field labelling experiment [PDF]

Biogeosciences, 2015
The mean residence times (MRT) of different compound classes of soil organic matter (SOM) do not match their inherent recalcitrance to decomposition. One reason for this is the stabilization within the soil matrix, but recycling, i.e.
A. Basler, M. Dippold, M. Helfrich, J. Dyckmans   +3 more
doaj   +1 more source

Synthesis of Isotope Labeled Protocatechuic Acid-(13COOH)

Journal of Isotopes, 2020
A novel synthesis method of protocatechuic acid-(13COOH) was designed. 3,4-dimethoxy bromobenzene as raw material, Grignard reagent was prepared by Grignard reaction, then passed through the 13C labeled 13CO2 gas, the intermediate 3,4-dimethoxy benzoic ...
XU Jianfei;LIU Zhanfeng;LU Weijing;LEI Wen;HOU Jie;DU Xiaoning
doaj   +1 more source

Stable oxygen and carbon isotope compositional fields for skeletal and diagenetic components in New Zealand Cenozoic nontropical carbonate sediments and limestones: A synthesis and review [PDF]

, 1996
The stable oxygen isotope composition (δ18O) of a precipitated carbonate depends mainly on the isotope composition, salinity, and temperature of the host fluid, whereas the stable carbon isotope composition (δ13C) reflects the source of CO2 for ...
Nelson, Campbell S., Campbell S. Nelson, Smith, Abigail M., Abigail M. Smith   +3 more
core   +1 more source

Isotopic Traceability (¹³C and ¹⁸O) of Greek Olive Oil

Molecules, 2020
In recent years, isotopic analysis has been proven a valuable tool for the determination of the origin of various materials. In this article, we studied the 18O and 13C isotopic values of 210 olive oil samples that were originated from different regions ...
Petros Karalis, Anastasia Elektra Poutouki, Theodora Nikou, Maria Halabalaki, Charalampos Proestos, Effie Tsakalidou, Sofia Gougoura, George Diamantopoulos, Maria Tassi, Elissavet Dotsika   +9 more
doaj   +1 more source

Stable isotope dilution techniques for assessing vitamin A status and bioefficacy of provitamin A carotenoids in humans. [PDF]

, 2005
Vitamin A deficiency is a major global public health problem. Among the variety of techniques that are available for assessing human vitamin A status, evaluating the provitamin A nutritional values of foodstuffs and estimating human vitamin A ...
Judy D Ribaya-Mercado, Emorn Wasantwisut, Marjorie Haskell, Sherry Tanumihardjo, Harold C Furr, Wasantwisut, Emorn, Tang, Guangwen, Penelope Nestel, Sam Newton, Guangwen Tang, Haskell, Marjorie, Ribaya-Mercado, Judy D, Najat Mokhtar, Furr, Harold C, Nestel, Penelope, Newton, Sam, Tanumihardjo, Sherry, Green, Michael H, Michael H Green, Mokhtar, Najat   +19 more
core   +1 more source

Manganese–pyridone-catalyzed site-selective hydrogen isotope exchange of 2-arylpyridines using D2O [PDF]

RSC Advances
We report a manganese-catalyzed protocol for the selective ortho-deuteration of 2-arylpyridines using D2O as a readily available deuterium source. Enabled by Mn(CO)5Br and 2-pyridone, the reaction delivers deuterated products in good isolated yields with
Jian-Fei Bai, Tao Qian, Yunlong Yao, Zhi-Jiang Jiang, Jia Chen, Zhanghua Gao   +5 more
doaj   +1 more source

Nitrogen-Induced Changes in Soil Environmental Factors Are More Important Than Nitrification and Denitrification Gene Abundance in Regulating N2O Emissions in Subtropical Forest Soils

Frontiers in Plant Science, 2022
Subtropical regions are currently experiencing a dramatic increase in nitrogen (N) deposition; however, the contributions of nitrification and denitrification processes to soil N2O emissions and the underlying mechanisms under increasing N deposition ...
Qingyan Qiu, Abubakari Said Mgelwa, Shaofei Jin, Yalin Hu   +3 more
doaj   +1 more source

Emerging experimental and computational methods for studying redox‐regulated structural transitions

FEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass, Dana Reichmann, Gábor Erdős   +2 more
wiley   +1 more source