Article
Biochemistry & Molecular Biology
Nuray Uzunlu, Peter Pongracz, Laszlo Kollar, Attila Takacs
Summary: In this research, bio-derived hemicellulose-based solvents, namely ethyl levulinate, methyl levulinate, and 2-methyltetrahydrofuran, were used as green alternatives in palladium-catalyzed aminocarbonylation reactions. Optimization reactions were conducted using iodobenzene and morpholine under varying conditions, including temperature, pressure, and ligands. The study found that the XantPhos ligand significantly influenced the conversion (98%) and chemoselectivity (100% carboxamide) compared to the monodentate PPh3 ligand. Furthermore, the optimized conditions were applied to expand the range of substrates and amine nucleophiles.
Article
Geochemistry & Geophysics
Tristan Babey, Kristin Boye, Bradley Tolar, Maya Engel, Vincent Noel, Zach Perzan, Naresh Kumar, Christopher A. Francis, John R. Bargar, Kate Maher
Summary: Sedimentary interfaces in alluvial aquifers influence the water quality and drive the development of biogeochemical interfaces. Organic-rich lenses play a key role in the cycling of carbon, iron, and sulfur, and can stimulate downstream biogeochemical processes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Microbiology
Qi-Yun Liang, Jin-Yu Zhang, Daliang Ning, Wen-Xing Yu, Guan-Jun Chen, Xuanyu Tao, Jizhong Zhou, Zong-Jun Du, Da-Shuai Mu
Summary: Inhibiting sulfate-reducing bacteria (SRB) has shown various effects on microbial community properties and coexistence patterns, indicating the importance of SRB in organic matter (OM) degradation. Suppression of SRB resulted in decreased relative abundances of several bacterial families and altered network and community assembly processes. These findings highlight the essential role of SRB in OM degradation.
Article
Environmental Sciences
Leilei Bai, Xin Liu, Ke Hua, Linqi Tian, Changhui Wang, Helong Jiang
Summary: This study investigated the impact of aquatic plant and algal biomass on the microbial processing of organic matter and the biodegradation of 17 alpha-ethinylestradiol (EE2) in anoxic sediments. The results showed that increased concentrations of organic matter promoted microbial activity and carbon mineralization, leading to higher EE2 biodegradation efficiency. Additionally, the presence of certain compounds accelerated the redox cycling of iron and organic substrates, further enhancing EE2 biodegradation.
ENVIRONMENTAL POLLUTION
(2022)
Article
Microbiology
Saara Suominen, Daan M. van Vliet, Irene Sanchez-Andrea, Marcel T. J. van der Meer, Jaap S. Sinninghe Damste, Laura Villanueva
Summary: The study reveals that the microbial communities in organic-rich, anoxic sediments are influenced by the type of organic matter, with Phyla Planctomycetes and Chloroflexi playing key roles as initial degraders in the carbon food chain. These microbes exhibit niche specialization at the order level, with different functions in the degradation of various organic compounds.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Soil Science
Livia Urbanski, Karsten Kalbitz, Janet Rethemeyer, Peter Schad, Ingrid Koegel-Knabner
Summary: This study focuses on the high organic carbon accumulation in sandy agricultural soils, specifically Plaggic Anthrosols, and finds that these soils have similar levels of OC concentration, radiocarbon ages, and organic matter composition compared to reference soils. It also reveals that a significant portion of soil OC is contained within the <=20 μm fraction, despite its low mass proportion. These findings indicate the presence of specific processes for organic matter accumulation in sandy agricultural soils.
Article
Geochemistry & Geophysics
Christoph Haeggi, Juergen Paetzold, Steven Bouillon, Enno Schefuss
Summary: The study investigates the isotopic stability of lipid biomarker compositions in two sediment cores from the brine-filled Shaban Deep in the northern Red Sea. It shows that the stable carbon isotope compositions of long-chain n-alkanes and alkenones remain stable under different sedimentary conditions, while the stable hydrogen isotope composition of long-chain n-alkanes and bulk organic matter increases consistently during degradation. The findings suggest that source-specific refractory molecules show minor variations under strong degradation, while compounds with multiple sources can exhibit strong variability, potentially hindering their use as paleoenvironmental proxies.
ORGANIC GEOCHEMISTRY
(2021)
Article
Geosciences, Multidisciplinary
Andrea Teixeira Ustra, Carlos Mendonca, Arua da Silva Leite, Melina Macouin, Rory Doherty, Marc Respaud, Giovana Tocuti
Summary: The magnetic properties characterization of sediment samples from a brownfield site generating methane biogas in Sao Paulo, Brazil, revealed a correlation between superparamagnetic particles and detected biogas pockets. Two simple measurement and interpretation techniques were proposed to identify the magnetic particles fingerprints, supporting the investigation of anaerobic microbial activity using environmental magnetism techniques.
FRONTIERS IN EARTH SCIENCE
(2021)
Review
Plant Sciences
Poonam Panchal, Anthony J. Miller, Jitender Giri
Summary: This article discusses the central role of organic acids (OAs) in cellular metabolism, highlighting their importance in plant stress responses, soil carbon sequestration, and sustainable food production. OAs are versatile in plant stress tolerance and efficient chelating agents, with key functions in combating climate change. The multiple functions of OAs, such as modifying pH and binding metals, are crucial factors in understanding their important roles in plant stress biology.
JOURNAL OF EXPERIMENTAL BOTANY
(2021)
Review
Geosciences, Multidisciplinary
Limin Hu, Yuhan Ji, Bin Zhao, Xiting Liu, Jiazong Du, Yantao Liang, Peng Yao
Summary: Marine sediments are important reservoirs of organic carbon (OC) and understanding the influence of iron on OC preservation is crucial. This review explores the mechanisms of iron-bound OC preservation in marine sediments, focusing on selective preservation by reactive iron minerals and iron redox processes. The study highlights the role of iron in long-term OC preservation and its potential application in marine carbon sequestration. Future research should focus on effective methods for extracting reactive iron, the impact of functional groups and sedimentary environments, and the role of micro-organisms.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geology
Susan A. Cumberland, Katy Evans, Grant Douglas, Martin de Jonge, Louise Fisher, Daryl Howard, John W. Moreau
Summary: The research found that pyrite in organic matter-rich sediments has a local influence on the oxidation state of uranium, which may be significant in uranium mobility. Analysis of framboidal-like pyrite with U(IV)-rich rims revealed that the U(IV) phase was mainly coffinite mixed with uraninite. Through transects analysis, it was discovered that U(IV) concentrations were higher near the pyrite, indicating a proportionally greater amount of U(VI) away from the edge of the pyrite.
ORE GEOLOGY REVIEWS
(2021)
Article
Environmental Sciences
Kate M. Fuller, Austin L. Fox, Charles A. Jacoby, John H. Trefry
Summary: The study investigated abundance and diversity of infauna in the Indian River Lagoon, finding that organic-rich sediments pose a certain stress on benthic organisms, with richness decreasing with increasing sediment concentrations of organic carbon, nitrogen, and silt + clay.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Alexis R. Johnson, Melissa M. Omand
Summary: The study investigates the subduction of particulate organic carbon in the North Atlantic Ocean, revealing a seasonal pattern and hypothesizing the presence of deep intrusions in the summer. The research provides insights into the long-term fate of subducted water through analysis of profiles and model output.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Microbiology
Zijing Liu, Ruanhong Cai, Yi-Lung Chen, Xiaocun Zhuo, Chen He, Qiang Zheng, Ding He, Quan Shi, Nianzhi Jiao
Summary: This study revealed that testosterone, a typical steroid, could be transformed into bio-refractory CRAM by a single bacterial strain and observed that some of the CRAM highly resisted microbial degradation. Potential chemical structures of steroid-induced CRAM were suggested through molecular comparison and screening. This study established the biological connection between steroids and bio-refractory CRAM, providing a novel perspective on the fate of terrestrial contaminants in aquatic environments.
MICROBIOLOGY SPECTRUM
(2023)
Article
Geosciences, Multidisciplinary
Yucai Song, Zhiming Yang, Liangliang Zhuang
Summary: The Tethyan domain in low latitude areas developed abundant organic matter-rich sediments and associated hydrocarbon resources, which played a crucial role in providing reduced sulfur for MVT Pb-Zn mineralization. The relationship between organic matter-rich sediments, MVT Pb-Zn mineralization, and the Tethyan tectonic evolution history is important in understanding the scientific issue. MVT deposits mainly formed during the continent-continent convergence, with organic matter-rich sediments and hydrocarbon activity playing a key role in the mineralization process.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)