Results 21 to 30 of about 64,264 (235)

C/N/O/S stable isotopic and chemometric analyses for determining the geographical origin of Panax ginseng cultivated in Korea

Journal of Ginseng Research, 2018
Background: The geographical origin of Panax ginseng Meyer, a valuable medicinal plant, is important to both ginseng producers and consumers in the context of economic profit and human health benefits.
Ill-Min Chung, Jae-Kwang Kim, Ji-Hee Lee, Min-Jeong An, Kyoung-Jin Lee, Sung-Kyu Park, Jang-Uk Kim, Mi-Jung Kim, Seung-Hyun Kim   +8 more
doaj   +1 more source

Authenticity Certification of Pu'er Raw Tea in Different Years Based on the Stable Isotope Ratios of Carbon and Nitrogen in Caffeine and Amino Acids

Shipin gongye ke-ji, 2023
The method of carbon and nitrogen stable isotope ratio analysis in caffeine and amino acids (gas chromatography combustion isotope ratio mass spectrometry, GC-C-IRMS) was used to carry out the authenticity certification of Pu'er raw tea in different ...
Honglin LIU, Yitao ZENG, Huarong TONG, Kai ZHANG, Zhao LI, Tianlai YANG   +5 more
doaj   +1 more source

An analytical system for stable isotope analysis on carbon monoxide using continuous-flow isotope-ratio mass spectrometry [PDF]

Atmospheric Measurement Techniques, 2015
A fully automated system for the determination of δ13C and δ18O in atmospheric CO has been developed. CO is extracted from an air sample and converted into carbon dioxide (CO2) using the Schütze reagent.
S. L. Pathirana, C. van der Veen, M. E. Popa, T. Röckmann   +3 more
doaj   +1 more source

Ontogenetic Growth Changes in Mercury and Stable Isotope Ratios of Carbon, Nitrogen, and Oxygen in Male and Female Dalli-Type Dall’s Porpoises (Phocoenoides dalli) Stranded in Hokkaido, Japan

Journal of Marine Science and Engineering
We investigated the ontogenetic growth changes in total mercury (THg) concentrations, δ13C, δ15N, and δ18O values, and body length (BL) of dalli-type Dall’s porpoises.
Tetsuya Endo, Osamu Kimura, Masaru Terasaki, Yoshihisa Kato, Yukiko Fujii, Koichi Haraguchi   +5 more
doaj   +1 more source

Stable Carbon Isotope Ratio (δ13C) Measurement of Graphite Using EA-IRMS System

Medžiagotyra, 2015
δ13C values in non-irradiated natural graphite were measured. The measurements were carried out using an elemental analyzer combined with stable isotope ratio mass spectrometer (EA-IRMS). The samples were prepared with ground and non-ground graphite, the
Andrius Garbaras, Edmundas Bružas, Vidmantas Remeikis   +2 more
doaj   +1 more source

Seasonal trends of the stable nitrogen isotope ratio in particulate nitrogen compounds and their gaseous precursors in Akita, Japan

Tellus: Series B, Chemical and Physical Meteorology, 2019
Particulate matter (PM) can have adverse effects on human health. Moreover, because the mechanisms of PM formation and behavior in the atmosphere are notably complicated, to reduce PM concentrations effectively and meet environmental standards, source ...
Hiroto Kawashima
doaj   +1 more source

Ginseng authenticity testing by measuring carbon, nitrogen, and sulfur stable isotope compositions that differ based on cultivation land and organic fertilizer type

Journal of Ginseng Research, 2017
Background: The natural ratios of carbon (C), nitrogen (N), and sulfur (S) stable isotopes can be varied in some specific living organisms owing to various isotopic fractionation processes in nature.
Ill-Min Chung, Taek-Jun Lee, Yong-Taek Oh, Bimal Kumar Ghimire, In-Bae Jang, Seung-Hyun Kim   +5 more
doaj   +1 more source

The Effect of Thermochemical Sulphate Reduction on the Carbon Isotope Ratio of Individual Light Hydrocarbons Associated With Natural Gas

Frontiers in Earth Science, 2022
To understand the effect of thermochemical sulphate reduction (TSR) on the stable carbon isotopes of light hydrocarbons (LHs) associated with natural gas, 15 gases with varying H2S content from Ordovician reservoir of the Tazhong gas field (TZ-I) in ...
Guoyi Hu, Jinhao Guo, Lianjie Tian, Xiaoqi Wu, Jin Su, Zhisheng Li, Chenchen Fang   +6 more
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

Meta‐analysis fails to show any correlation between protein abundance and ubiquitination changes

FEBS Open Bio, EarlyView.
We analyzed over 50 published proteomics datasets to explore the relationship between protein levels and ubiquitination changes across multiple experimental conditions and biological systems. Although ubiquitination is often associated with protein degradation, our analysis shows that changes in ubiquitination do not globally correlate with changes in ...
Nerea Osinalde, Unai Alduntzin, Gorka Prieto, Ugo Mayor   +3 more
wiley   +1 more source