Yohei Matsui
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View article: Methane- and hydrogen-dependent prokaryotic deep biosphere at the Suwa Basin, Japan: impacts of hydrogeological processes on subsurface prokaryotic ecology at the boundary between the North American and the Eurasian Plates
Methane- and hydrogen-dependent prokaryotic deep biosphere at the Suwa Basin, Japan: impacts of hydrogeological processes on subsurface prokaryotic ecology at the boundary between the North American and the Eurasian Plates Open
The subsurface biosphere hosts diverse prokaryotes whose metabolic activities and roles in biogeochemical cycles remain unexplored. Specifically, interactions between subsurface prokaryotes and environmental characteristics are poorly cons…
View article: Coral calcification under environmental change: a direct comparison of the alkalinity anomaly and buoyant weight techniques
Coral calcification under environmental change: a direct comparison of the alkalinity anomaly and buoyant weight techniques Open
View article: Methylomarinovum tepidoasis sp. nov., a moderately thermophilic methanotroph of the family Methylothermaceae isolated from a deep-sea hydrothermal field
Methylomarinovum tepidoasis sp. nov., a moderately thermophilic methanotroph of the family Methylothermaceae isolated from a deep-sea hydrothermal field Open
A novel aerobic methanotrophic bacterium, designated as strain IN45 T , was isolated from in situ colonisation systems deployed at the Iheya North deep-sea hydrothermal field in the mid-Okinawa Trough. IN45 T was a moderately thermophilic …
View article: Extreme accumulation of ammonia on electroreduced mackinawite: An abiotic ammonia storage mechanism in early ocean hydrothermal systems
Extreme accumulation of ammonia on electroreduced mackinawite: An abiotic ammonia storage mechanism in early ocean hydrothermal systems Open
An increasing amount of evidence suggests that early ocean hydrothermal systems were sustained sources of ammonia, an essential nitrogen species for prebiotic synthesis of life’s building blocks. However, it remains a riddle how the abioti…
View article: Deep-sea freezer
Deep-sea freezer Open
Recovery of samples from the deep ocean in pristine condition is difficult due to large environmental differences between the deep and surface waters through which the samples necessarily must be transported. Here, we propose a concept for…
View article: The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites
The noble gas and nitrogen relationship between Ryugu and carbonaceous chondrites Open
View article: First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu
First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu Open
The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bot…
View article: Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution
Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution Open
The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth’s volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measure…
View article: Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton
Nitrogen Isotopes of Sinking Particles Reveal the Seasonal Transition of the Nitrogen Source for Phytoplankton Open
In the high‐productivity subarctic ocean, phytoplankton growth is assumed to rely mainly on nitrate, based on snapshot observations conducted in spring or summer. However, the year‐round utilization of nitrate and ammonium by phytoplankton…
View article: Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water
Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water Open
Isotope fractionation factors associated with various biogeochemical processes are important in ensuring the reliable use of isotope tracers in biogeosciences at large. Methane is a key component of the subsurface biosphere and a notable g…
View article: In situ experimental evidences for responses of abyssal benthic biota to shifts in phytodetritus compositions linked to global climate change
In situ experimental evidences for responses of abyssal benthic biota to shifts in phytodetritus compositions linked to global climate change Open
Abyssal plains cover more than half of Earth's surface, and the main food source in these ecosystems is phytodetritus, mainly originating from primary producers in the euphotic zone of the ocean. Global climate change is influencing phytop…
View article: Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water
Hydrogen and carbon isotope fractionation factors of aerobic methane oxidation in deep-sea water Open
Isotope fractionation factors associated with various biogeochemical processes are important in ensuring the practicality of isotope tracers in biogeosciences at large. Methane is a key component of the subsurface biosphere and a notable g…
View article: Abyssal fauna, benthic microbes, and organic matter quality across a range of trophic conditions in the western Pacific ocean
Abyssal fauna, benthic microbes, and organic matter quality across a range of trophic conditions in the western Pacific ocean Open
View article: Subseafloor sulphide deposit formed by pumice replacement mineralisation
Subseafloor sulphide deposit formed by pumice replacement mineralisation Open
Seafloor massive sulphide (SMS) deposits, modern analogues of volcanogenic massive sulphide (VMS) deposits on land, represent future resources of base and precious metals. Studies of VMS deposits have proposed two emplacement mechanisms fo…
View article: Abiotic Methane Generation via CO<sub>2</sub> Hydrogenation With Natural Chromitite Under Hydrothermal Conditions
Abiotic Methane Generation via CO<sub>2</sub> Hydrogenation With Natural Chromitite Under Hydrothermal Conditions Open
In modern continental serpentinization systems and ultramafic rock‐hosted sub‐seafloor hydrothermal systems, it is believed that chromitite plays an important role in abiotic hydrocarbon generation. Previous experiments have suggested that…
View article: Gold-coated silver capsule for elemental analyzer-isotope ratio mass spectrometer: Robust against pretreatment of rock material for organic carbon and δ<sup>13</sup>C analyses
Gold-coated silver capsule for elemental analyzer-isotope ratio mass spectrometer: Robust against pretreatment of rock material for organic carbon and δ<sup>13</sup>C analyses Open
For organic C content and stable isotope analysis of a sediment sample, an essential pretreatment procedure is acidification to remove carbonates in the sample. Although strong acids are required for removal of recalcitrant carbonates (e.g…
View article: Annual coral bleaching and the long-term recovery capacity of coral
Annual coral bleaching and the long-term recovery capacity of coral Open
Mass bleaching events are predicted to occur annually later this century. Nevertheless, it remains unknown whether corals will be able to recover between annual bleaching events. Using a combined tank and field experiment, we simulated ann…
View article: Foraminiferal Ecology and Role in Nitrogen Benthic Cycle in the Hypoxic Southeastern Bering Sea
Foraminiferal Ecology and Role in Nitrogen Benthic Cycle in the Hypoxic Southeastern Bering Sea Open
Southeastern Bering Sea is one of the highest surface productivity area in the open ocean due to strong upwelling along the Bering canyon. However, the benthic geochemistry and organisms living in the area have been largely overlooked. In …
View article: Experimental Simulations of Hypervelocity Impact Penetration of Asteroids Into the Terrestrial Ocean and Benthic Cratering
Experimental Simulations of Hypervelocity Impact Penetration of Asteroids Into the Terrestrial Ocean and Benthic Cratering Open
Seafloor cratering is an important process that records the impact history of the Earth, affects projectile survivability, and determines the mass of ejecta from benthic rock that is transported to the atmosphere. We report experimental hy…
View article: Correction to: High-temperature acclimation strategies within the thermally tolerant endosymbiont Symbiodinium trenchii and its coral host, Turbinaria reniformis, differ with changing pCO2 and nutrients
Correction to: High-temperature acclimation strategies within the thermally tolerant endosymbiont Symbiodinium trenchii and its coral host, Turbinaria reniformis, differ with changing pCO2 and nutrients Open
View article: Isolation of an archaeon at the prokaryote–eukaryote interface
Isolation of an archaeon at the prokaryote–eukaryote interface Open
View article: Radiocarbon (<sup>1</sup><sup>4</sup>C) Analysis of Hydrothermal CO<sub>2</sub> and CH<sub>4</sub> at Okinawa Trough
Radiocarbon (<sup>1</sup><sup>4</sup>C) Analysis of Hydrothermal CO<sub>2</sub> and CH<sub>4</sub> at Okinawa Trough Open
View article: Radiocarbon content of carbon dioxide and methane in hydrothermal fluids of Okinawa Trough vents
Radiocarbon content of carbon dioxide and methane in hydrothermal fluids of Okinawa Trough vents Open
Here we quantify radiocarbon (14C) content in CO2 and CH4 from hydrothermal fluids collected at 5 vent sites in the Okinawa Trough. These data provide preliminary insights on how different carbon sources and circulation processes contribut…
View article: Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments
Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments Open
Hadal trench bottom (>6000 m below sea level) sediments harbor higher microbial cell abundance compared with adjacent abyssal plain sediments. This is supported by the accumulation of sedimentary organic matter (OM), facilitated by trench …
View article: Data for: Experimental simulations of hypervelocity impact fragmentation of chondritic meteoroids onto the ancient terrestrial ocean as a potentially sustainable source of organics"
Data for: Experimental simulations of hypervelocity impact fragmentation of chondritic meteoroids onto the ancient terrestrial ocean as a potentially sustainable source of organics" Open
Dataset of hypervelocity impact experiments simulating oceanic impacts of asteroids, showing the fragmentation of projectile (chondrite, stainless-steel, olivine) within expanding water cavities filled with water bubbles. Table 1: Relation…
View article: Response of N2O production rate to ocean acidification in the western North Pacific
Response of N2O production rate to ocean acidification in the western North Pacific Open
View article: Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments
Microbial community and geochemical analyses of trans-trench sediments for understanding the roles of hadal environments Open
Hadal trench bottom (>6,000 m below sea level) sediments harbor higher microbial cell abundance compared to adjacent abyssal plain sediments. This is supported by the accumulation of sedimentary organic matter (OM), facilitated by trench t…
View article: Isolation of an archaeon at the prokaryote-eukaryote interface
Isolation of an archaeon at the prokaryote-eukaryote interface Open
The origin of eukaryotes remains enigmatic. Current data suggests that eukaryotes may have risen from an archaeal lineage known as “Asgard archaea”. Despite the eukaryote-like genomic features found in these archaea, the evolutionary trans…
View article: Cultivable microbial community in 2-km-deep, 20-million-year-old subseafloor coalbeds through ~1000 days anaerobic bioreactor cultivation
Cultivable microbial community in 2-km-deep, 20-million-year-old subseafloor coalbeds through ~1000 days anaerobic bioreactor cultivation Open
View article: Moving-object tracking using laser scanner mounted on two-wheeled vehicle based on environmental map subtraction
Moving-object tracking using laser scanner mounted on two-wheeled vehicle based on environmental map subtraction Open
This paper presents a tracking (estimating position, velocity and size) of moving objects, such as cars, two-wheeled vehicles, and pedestrians, using a multilayer laser scanner mounted on a two-wheeled vehicle. The vehicle obtains its own …