A5060724753- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Metabolomics and Mass Spectrometry Studies
- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Astro and Planetary Science
- Planetary Science and Exploration
- Mass Spectrometry Techniques and Applications
- NMR spectroscopy and applications
- Chemical Reactions and Isotopes
- Fermentation and Sensory Analysis
- Analytical Chemistry and Chromatography
- Atmospheric Ozone and Climate
- Microbial Community Ecology and Physiology
- Advanced NMR Techniques and Applications
- Origins and Evolution of Life
- Space Exploration and Technology
- History and advancements in chemistry
- Plant nutrient uptake and metabolism
- Respiratory Support and Mechanisms
- Long-Term Effects of COVID-19
- Metabolism and Genetic Disorders
- Advanced Chemical Sensor Technologies
Tokyo Institute of Technology
2016-2025
Life Science Institute
2016-2025
Institute of Science Tokyo
2025
Earth-Life Science Institute
2020
Université Paris-Sud
2012
Centre National de la Recherche Scientifique
2009-2012
Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation
2009-2012
Nantes Université
2009-2012
Université Nantes Angers Le Mans
2012
Institut des Sciences des Plantes de Paris Saclay
2012
Significance Carbon isotopic analysis is among the most pervasive geochemical approaches because fractionation of carbon isotopes produces a natural tracer biological and chemical processes. Rover-based analyses sedimentary rocks on Mars have potential to reveal modes Martian cycling. We report values methane released during pyrolysis samples obtained at Gale crater. The show remarkable variation indicating different origins for evolved from samples. Samples multiple locations within crater...
Mid-infrared laser absorption spectroscopy enables rapid and nondestructive analysis of methane clumped isotopes. However, current analytical methods require a sample size 20 mL STP (0.82 mmol) pure CH4 gas, which significantly limits its application to natural samples. To enhance the performance spectroscopic measurement isotopes, we established platform with newly selected spectral windows for isotope analysis: 1076.97 cm–1 12CH2D2 1163.47 13CH3D, custom-built gas inlet system. These were...
The stable carbon isotope 13 C is used as a universal tracer in plant eco-physiology and studies of exchange between vegetation atmosphere. Photosynthesis fractionates against CO 2 so that source sugars (photosynthates) are on average depleted by 20‰ compared with atmospheric . distribution within has been shown to be heterogeneous, relatively C-enriched C-depleted C-atom positions. pattern the cornerstone plants, because all metabolites inherit abundance their specific precursor However,...
Microbial anaerobic oxidation of hydrocarbons is a key process potentially involved in myriad geological and biochemical environments yet has remained notoriously difficult to identify quantify natural environments. We performed position-specific carbon isotope analysis propane from cracking incubation experiments. Anaerobic bacterial leads pronounced previously unidentified 13C enrichment the central position propane, which contrasts with signature associated thermogenic process. This...
In order to understand (13)C isotope distributions in glucose and its metabolites, it is necessary measure the internal distribution at natural abundance. These data, however, are not directly accessible, even by quantitative isotopic NMR spectrometry, due anomerization C-1 position. A strategy has been developed that overcomes this difficulty converting via a three-step synthesis into 3,5,6-triacetyl-1,2-O-isopropylidene-alpha-D-glucofuranose (TAMAGF). This compound provides satisfactory...
Abstract Thioesters and thioacetic acid (TAA) have been invoked as key reagents for the origin of life activated forms acetate analogous to acetyl-CoA. These species could served high-energy group-transfer allowed carbon insertions form higher molecular weight compounds such pyruvate. The apparent antiquity Wood-Ljungdahl CO 2 fixation pathway its presence in organisms which inhabit hydrothermal (HT) environments has also led suggestions that there may be a connection between abiotic...
Efficient CO production realizing Wächtershäuser’s scenario was demonstrated in simulated early ocean hydrotherm systems.
Until now, no analytical method, not even isotopic ones, had been able to differentiate between sugars coming from C4-metabolism plants (cane, maize, etc.) and some crassulacean acid metabolism (e.g., pineapple, agave) because in both cases the isotope distributions of overall carbon-13/carbon-12 site-specific deuterium/hydrogen ratios are very similar. Following recent advances field quantitative carbon-13 NMR measurements, a procedure for analysis positional ethanol derived pineapples...
Efforts to understand the cause of ¹²C versus ¹³C isotope fractionation in plants during photosynthesis and post-photosynthetic metabolism are frustrated by lack data on intramolecular ¹³C-distribution metabolites its variation with environmental conditions. We have exploited isotopic carbon-13 nuclear magnetic resonance (¹³C NMR) spectrometry measure positional composition (δ¹³C(i) , ‰) ethanol samples from different origins: European wines, liquors sugars C₃, C₄ crassulacean acid (CAM)...
Organic molecules are key components of the Earth-life system. Their stable isotope composition provides information on various problems such as past climate, energy resources, or synthesis prebiotically relevant Earth and elsewhere. made isotopologues, differing in number and/or position substitution. Recent years have witnessed a boom technological development dedicated to isotopologue measurement, leading an unprecedented degree regarding organic (bio)synthesis. While applications...
• Recent developments in 13C NMR spectrometry have allowed the determination of intramolecular 13C/12C ratios with high precision. However, analysis carbohydrates requires their derivatization to constrain anomeric carbon. Fructose has proved be particularly problematic because a byproduct occurring during and complexity spectrum derivative. Here, we describe method determine fructose by acetyl-isopropylidene We applied this measure distribution fructosyl moiety sucrose compared that...
The studies of deep-sea gas venting associated with occurrences hydrates in the Amazon Cone has increased interest world scientific community understanding role region Earth's climate system. Gas plumes have been observed to align along edge regional hydrate stability zone several areas, suggesting climate-driven dissociation hydrates, and faults related gravitational collapse fan. that migrates toward seabed is stored and/or authigenic carbonates or released oceans by seafloor venting.Here,...
Microbial methane production represents an important source of on Earth. In oil and gas reservoirs, microbial can be formed from secondary methanogenesis, i.e., C2+ hydrocarbons biodegradation, either directly [1] or indirectly the biodegradation products [2]. Despite its global significance [2], methanogenesis is arguably challenging to detect, mainly because isotopic signature overlaps with that existing thermogenic in reservoir, thus inferred only indirect proxies such as high 13C content...