Article
Biology
John B. Hopkins III, Cheryl A. Frederick, Derek Yorks, Erik Pollock, Matthew W. H. Chatfield
Summary: This study developed a predictive model based on stable isotopes to classify confiscated wood turtles as wild or captive. The researchers found distinct isotopic differences between wild and captive wood turtles and achieved a high accuracy rate in classifying them. This research is significant in combating wildlife trafficking and conservation efforts.
Article
Microbiology
Lei Chen, Mengyao Sun, Di Xu, Zenghao Gao, Yuying Shi, Shen Wang, Yiping Zhou
Summary: This study compares the gut microbiota of wild wolves, captive wolves, and domestic dogs, and finds significant differences in species diversity and functional diversity among these groups. Captive wolves are more similar to domestic dogs in terms of both species composition and function composition of intestinal microbiota, compared to wild wolves.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Geochemistry & Geophysics
Guitao Shi, Hongmei Ma, Zhuoyi Zhu, Zhengyi Hu, Zhenlou Chen, Su Jiang, Chunlei An, Jinhai Yu, Tianming Ma, Yuansheng Li, Bo Sun, Meredith G. Hastings
Summary: The study found that atmospheric nitrate is mainly concentrated on intermediate size particles, with much higher concentrations observed in the northern hemisphere compared to high southern latitudes. Isotope analysis indicated that elevated atmospheric nitrate in coastal areas is associated with human activities, while in high southern latitudes, it is influenced by precursor Antarctic snowpack emissions.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Luiza Brasileiro, Rodrigo Ribeiro Mayrink, Andre Costa Pereira, Fabio Jose Viana Costa, Gabriela Bielefeld Nardoto
Summary: This literature review shows that stable isotope analysis can be used to distinguish between wild and captive animals in different vertebrate groups, rearing conditions, and methodological designs. However, there are still some gaps in the research, especially for certain taxonomic groups, countries, and isotopes that have been studied less. Careful consideration should be given to the conditions of wild and captivity, the tissues analyzed, and the homogeneity of the samples when using this methodology.
Article
Biodiversity Conservation
John B. Hopkins III, Cheryl A. Frederick, Derek Yorks, Erik Pollock, Matthew W. H. Chatfield
Summary: This study developed predictive models using the chemical signatures of captive and wild wood turtles to determine their origins. The results showed that the stable isotope ratio model was highly accurate in classifying the turtles, and the trace element and combined model were even more accurate. This research is important for law enforcement to combat poaching.
Article
Geochemistry & Geophysics
Christoph Spoetl, Yuri Dublyansky, Gabriella Koltai, Charlotte Honiat, Lukas Plan, Thomas Angerer
Summary: This study demonstrates that geochemical analysis of cave wall rock samples can identify hypogene karstification and provide further insights into the temperature and provenance of paleowater, as well as the source of its dissolved inorganic carbon.
Article
Chemistry, Applied
Baohui Jin, Xiuwen Zhou, Karyne M. M. Rogers, Bingqing Yi, Xuehai Bian, Zhi Yan, Haiquan Chen, Haichao Zhou, Liqi Xie, Guanghui Lin, Hao Wu
Summary: Stable isotopes combined with chemometrics methods can distinguish fresh milk from reconstituted milk. Nitrogen stable isotopes are also useful for detecting extraneous nitrogen additives in milk.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2022)
Article
Geochemistry & Geophysics
Jaime Cesar, Bernhard Mayer, Pauline Humez
Summary: A new approach utilizing a carbon isotope difference between methane and ethane, as well as their individual delta C-13 values, has been proposed to refine the assessment of natural gas origins. Additionally, a mathematical notation called the isotope factor O-(C1/C2) has been introduced for discriminating the origin of natural gas samples, leading to improved distinction between primary microbial and thermogenic gases.
APPLIED GEOCHEMISTRY
(2021)
Article
Engineering, Environmental
Ryan F. Lepak, Jacob M. Ogorek, Krista K. Bartz, Sarah E. Janssen, Michael T. Tate, Yin Runsheng, James P. Hurley, Daniel B. Young, Collin A. Eagles-Smith, David P. Krabbenhoft
Summary: This study assessed the importance of migrating oceanic salmon, volcanic activity, and atmospheric deposition to fish mercury burden by analyzing lake trout in 13 remote lakes in southwestern Alaska. The results showed that volcanic activity is a significant additional source of mercury in proximate lakes, while migratory salmon contribute little methylmercury directly to lake trout. The study also found niche partitioning and a complex suite of ecological interactions in lake trout populations.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2022)
Article
Energy & Fuels
Qian Wang, Shifeng Dai, David French, Baruch Spiro, Ian Graham, Jingjing Liu
Summary: The thermal effects of a quartz intrusion during the Yanshanian Orogeny on coal mines in the Daqingshan Coalfield in Inner Mongolia have caused changes in coal quality and chemical characteristics. As the distance from the intrusion decreases, there is an increase in vitrinite reflectance values and a decrease in volatile matter content in the coal mines. The organic carbon isotopes in the coals also vary with the distance from the intrusion.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Forestry
Leiru Chen, Zhengyu Wen, Ruoyong Yin, Pengfei Deng, Yu Gao, Hui Xu, Xiaoniu Xu
Summary: Anthropogenic activities have increased nitrogen deposition and N availability, potentially exacerbating phosphorus deficiency in subtropical forests. The effects of N and N + P additions on SOC turnover in these forests are crucial for understanding the global C cycle. This study aimed to confirm whether N and N + P additions accelerate or slow down SOC turnover in subtropical forests.
Article
Geochemistry & Geophysics
Dong Feng, John W. Pohlman, Joern Peckmann, Yuedong Sun, Yu Hu, Harry H. Roberts, Duofu Chen
Summary: This study analyzed organic matter enclosed within seep carbonates from the Gulf of Mexico and the South China Sea to assess if sediment organic matter may be used as a proxy for methane seepage intensity. The research investigated carbon quantity, radiocarbon content, and stable carbon isotopic compositions, suggesting that seepage intensity and duration are the most important factors controlling the contribution of methane-derived carbon to the sedimentary column.
Article
Biochemical Research Methods
Karyne M. Rogers, Jocelyn C. Turnbull, Jenny Dahl, Andy Phillips, Jamie H. Bridson, Laura G. Raymond, Zhi Liu, Yuwei Yuan, Stefan J. Hill
Summary: A combination of stable carbon and hydrogen isotope ratios and carbon content was evaluated as a rapid and low-cost analytical approach to authenticate bioplastics. The study found distinctive isotope ratios for different precursor plastics and was able to identify instances of mislabelled bioplastics containing petroleum-based materials. This dual approach proved to be accurate and effective in classifying plastic types and verifying bio-based claims.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2021)
Article
Environmental Sciences
Semra Bakkaloglu, Dave Lowry, Rebecca E. Fisher, Malika Menoud, Mathias Lanoiselle, Huilin Chen, Thomas Rockmann, Euan G. Nisbet
Summary: This study characterizes the carbon isotopic signatures of methane waste sources and explores the use of hydrogen isotopes for waste source identification. The results show distinct signatures for different waste sources, providing valuable information for regional modeling.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Yixin Dong, Ying Cui, Jiuyuan Wang, Hongde Chen, Feifei Zhang, Yuyang Wu, Ziheng Li, Peng Zhu, Shijun Jiang
Summary: The carbon isotope records of C-3 land plants in Paleozoic sediments and marine carbonates provide insights into the global carbon cycle. The data suggest an increase in organic carbon burial, controlled by factors such as sea level, nutrient availability, and life innovation. Proxy-based paleotemperature records indicate a correlation between elevated paleotemperatures and higher pCO2 levels in the Late Devonian.
EARTH-SCIENCE REVIEWS
(2021)