Results 31 to 40 of about 163,020 (214)

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

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

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

rdbouche/Non-Human-Primate-Stable-Isotope-Data: Rhesus Macaque (Macaca mulatta) iron (Fe) and copper (Cu) stable isotope data & code [PDF]

, 2020
This is the stable isotope data and R code from the paper, "Iron (Fe) and copper (Cu) stable isotope evidence in mature rhesus macaques (Macaca mulatta) suggests age-related ...
Shauhin E. Alavi, Renee D. Boucher, Hylke N. de Jong, Linda V. Godfrey, Erin R. Vogel   +4 more
core   +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

A ¹⁵N stable isotope semen label to detect mating in the malaria mosquito Anopheles arabiensis Patton [PDF]

, 2008
In previous studies it was determined that the stable isotope 13-carbon can be used as a semen label to detect mating events in the malaria mosquito Anopheles arabiensis. In this paper we describe the use of an additional stable isotope, 15-nitrogen (15N)
Hood Rebecca C, Knols, B.G.J., Gludovacz Doris, Mayr Leo, Gludovacz, D., Knols Bart GJ, Helinski Michelle EH, Helinski, M., Hood-Nowotny, R.C., Mayr, L.   +9 more
core   +1 more source

An investigation into the archaeological application of carbon stable isotope analysis used to establish crop water availability: solutions and ways forward [PDF]

, 2011
Carbon stable isotope analysis of charred cereal remains is a relatively new method employed by archaeological scientists to investigate ancient climate and irrigation regimes. The aim of this study was to assess the effect of environmental variables
Jenkins, Emma L., Emma Jenkins, Stokes, H., Muldner, G., Helen Stokes, Gundula Müldner   +5 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

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, Richards, M. ; https://orcid.org/, Hublin, Jean-Jacques, Fahy, Geraldine, Fahy, G. ; https://orcid.org/, Richards, Michael P., Boesch, C. ; https://orcid.org/, Hublin, J. ; https://orcid.org/   +7 more
core   +1 more source

Combined stable isotope and gut contents analysis of food webs in plant-dominated, shallow lakes [PDF]

, 2003
1. To determine feeding links between primary producers, invertebrates and fish, stable isotope analyses and gut content analyses of fish were conducted on the components of four shallow, eutrophic to hypertrophic, plant-dominated lakes. 2.
Susan Waldron, J. Iwan Jones, Jones, J.I., Waldron, S.   +3 more
core   +1 more source