Results 41 to 50 of about 116,875 (192)

Compound-specific stable isotope analyses in Falkland Islands seabirds reveal seasonal changes in trophic positions

BMC Ecology, 2020
Background While nitrogen and carbon stable isotope values can reflect ecological segregation, prey choice and spatial distribution in seabirds, the interpretation of bulk stable isotope values is frequently hampered by a lack of isotopic baseline data ...
Petra Quillfeldt, Juan F. Masello
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A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience

Progress in Earth and Planetary Science, 2020
Stable nitrogen (15N/14N) and carbon (13C/12C) isotopic compositions of amino acids in organisms have widely been employed as a powerful tool to evaluate resource utilization and trophic connection among organisms in diverse ecosystems.
Yuko Takizawa, Yoshinori Takano, Bohyung Choi, Prarthana S. Dharampal, Shawn A. Steffan, Nanako O. Ogawa, Naohiko Ohkouchi, Yoshito Chikaraishi   +7 more
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Chlorine and Bromine Isotope Fractionation of Halogenated Organic Pollutants on Gas Chromatography Columns

, 2017
Compound-specific chlorine/bromine isotope analysis (CSIA-Cl/Br) has become a useful approach for degradation pathway investigation and source appointment of halogenated organic pollutants (HOPs).
Fan, Yujuan, Liu, Jun, Peng, Xianzhi, Tan, Jianhua, Tang, Caiming, Xiong, Songsong   +5 more
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The derivation of the formyl-group oxygen of chlorophyll b in higher plants from molecular oxygen. [PDF]

, 1994
The mechanism of formation of the formyl group of chlorophyll b has long been obscure but, in this paper, the origin of the 7-formyl-group oxygen of chlorophyll b in higher plants was determined by greening etiolated maize leaves, excised from dark-grown
Abraham R. J., Beale S. I., Bjorkman O., Brown S. B., Chunaev A. S., Ghosh R., Hayaishi O., Henningsen K. W., IUPAC-IUB Joint Commission on Biochemical Nomenclature (JCBN), Klein O., Lane C. F., Leeper F. J., Michalski T. J., Nashrulhaq-Boyce A., Naylor S., Parkes-Loach P. S., Parkes-Loach P. S., Paulsen H., Plumley F. G., Porra R. J., Porra R. J., Porra R. J., Rudiger W., Scheer H., Scheer H., Schneegurt M. A., Walker C. J., Wong Y. S.   +27 more
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Carbon isotopic changes of 16 proteinogenic amino acids during trophic transfer in a cultured marine consumer

Progress in Earth and Planetary Science
Stable carbon isotopic compositions of amino acids (δ 13CAA) in organisms potentially record information on carbon sources and flow in food webs. In this study, we report δ 13C values of 16 proteinogenic amino acids in marine consumers and evaluate their
Yuchen Sun, Naoto F. Ishikawa, Nanako O. Ogawa, Yoshinori Takano, Naohiko Ohkouchi   +4 more
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Consequences of employing amino acid vs. bulk‐tissue, stable isotope analysis: a laboratory trophic position experiment

Ecosphere, 2015
An important metric of environmental health is food web structure because it reflects species richness, natural history diversity, and resource availability.
R. E. Bowes, J. H. Thorp
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Dietary plasticity linked to divergent growth trajectories in a critically endangered sea turtle

Frontiers in Ecology and Evolution, 2023
Foraging habitat selection and diet quality are key factors that influence individual fitness and meta-population dynamics through effects on demographic rates.
Matthew D. Ramirez, Larisa Avens, Anne B. Meylan, Anne B. Meylan, Donna J. Shaver, Angela R. Stahl, Peter A. Meylan, Peter A. Meylan, Jamie M. Clark, Jamie M. Clark, Lyndsey N. Howell, Brian A. Stacy, Wendy G. Teas, Kelton W. McMahon   +13 more
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Nitrogen isotope analysis of ammonium and glycine [PDF]

, 2005
Stable isotope techniques can be used as a tool in nitrogen cycling studies of different ecosystems. The studies are based on measurement of the heavy (15N)- to- light (14N) isotopic ratios of nitrogen in different biospheric pools.
Norlin, Elin
core  

Compound-Specific Chlorine Isotope Analysis of the Herbicides Atrazine, Acetochlor, and Metolachlor [PDF]

Analytical Chemistry, 2019
A gas chromatography-single quadrupole mass spectrometry method was developed and validated for compound-specific chlorine isotope analysis (Cl-CSIA) of three chlorinated herbicides, atrazine, acetochlor, and metolachlor, which are widespread contaminants in the environment. For each compound, the two most abundant ions containing chlorine (202/200 for
Violaine Ponsin, Clara Torrentó, Christina Lihl, Martin Elsner, Daniel Hunkeler   +4 more
openaire   +5 more sources

Research Progress on Stable Isotope Online Testing Technology for Organic Contaminants

Yankuang ceshi, 2013
Compound-specific isotope analysis (CSIA) online is an indispensable key technique for identifying the sources of organic contaminants in the environment and characterizing their transformation processes, but there are still some problems in practical ...
FANG Jing-jing, ZHOU Ai-guo, LIU Cun-fu, GAN Yi-qun, ZHOU Jian-wei, CAI He-sheng, LIU Yun-de, ZHANG Yan-peng   +7 more
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