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Recently Added
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Terrestrial Organic Matter Inputs Modulate Methane Emissions from a Mega-Reservoir
(2025)ENVIRONMENTAL SCIENCE & TECHNOLOGYReservoirs are hotspots for methane (CH4) emissions. However, to date, the effects of terrestrial organic matter (OM) input and degradation on CH4 emissions from large reservoirs remain largely unknown. From May 2020 to April 2021, we conducted monthly sampling campaigns at 100 sites in Lake Qiandao (580 km2), a mega-reservoir in China, and made monthly vertical profile observations from March to September 2023. We estimated an annual ...Journal Article -
New and old coral radiocarbon records revisited for the subtropical and tropical Atlantic Ocean
(2025)RadiocarbonOcean radiocarbon (C-14) is a proxy for air-sea exchange, vertical and horizontal mixing, and water mass identification. Here, we present five pre- to post-bomb coral Delta C-14 records from West Flower Garden Bank and Santiaguillo reefs in the Gulf of Mexico, Boca de Medio, and Isla Tortuga near the Cariaco Basin north of Venezuela. To assess basin-wide Delta C-14 variability, we compiled the Atlantic Ocean reef-building surface coral ...Journal Article -
Enantiospecific Synthesis of α-Tertiary Amines: Ruthenium-Catalyzed Allylic Amination with Aqueous Ammonia
(2025)Journal of the American Chemical SocietyAmmonia stands out as the most available, cost-effective, and atom-economical source of nitrogen for organic synthesis. In the laboratory, it is safely and most conveniently handled in aqueous solution. Despite the advantages, the direct application of aqueous ammonia in the field of transition-metal catalysis remains a significant challenge. In this study, we report the first ruthenium-catalyzed allylic substitution using ammonia. The ...Journal Article -
High-Precision Oxygen-Isotope Analysis of Iron (Oxyhydr)oxides Using High-Temperature Conversion Isotope Ratio Mass Spectrometry
(2025)Analytical ChemistryWe introduce a novel high-precision method for oxygen-isotope analysis of iron (oxyhydr)oxides using high-temperature conversion isotope ratio mass spectrometry (HTC-IRMS). In this approach, a finely ground mixture of iron (oxyhydr)oxide and graphite is heated at 1450 degrees C in a helium flow environment, converting oxygen to CO gas with nearly 100% yield. Continuous-flow IRMS analysis of the liberated CO yields a precision of +/- 0.15 ...Journal Article -
Patterns of crossover distribution in Drosophila mauritiana necessitate a re-thinking of the centromere effect on crossing over
(2025)GENETICSWe present an SNP-based crossover map for Drosophila mauritiana. Using females derived by crossing 2 different strains of D. mauritiana, we analyzed crossing over on all 5 major chromosome arms. Analysis of 105 male progeny allowed us to identify 327 crossover chromatids bearing single, double, or triple crossover events, representing 398 crossover events. We mapped the crossovers along these 5 chromosome arms using a genome sequence map ...Journal Article