A5016945790- Astro and Planetary Science
- Isotope Analysis in Ecology
- Phase-change materials and chalcogenides
- Planetary Science and Exploration
- Solid-state spectroscopy and crystallography
- Origins and Evolution of Life
- Graphite, nuclear technology, radiation studies
- Radiation Detection and Scintillator Technologies
- Advanced Semiconductor Detectors and Materials
- Magnetic and Electromagnetic Effects
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Radioactive contamination and transfer
- Chemical Reactions and Isotopes
- Nuclear and radioactivity studies
- Chalcogenide Semiconductor Thin Films
- Nuclear Materials and Properties
- Spinal Hematomas and Complications
- Chemical Analysis and Environmental Impact
- Medical Imaging Techniques and Applications
- Muscle activation and electromyography studies
- Optical Coatings and Gratings
- Spaceflight effects on biology
- Venous Thromboembolism Diagnosis and Management
- Spinal Fractures and Fixation Techniques
Tokyo Institute of Technology
2005-2024
Life Science Institute
2018
Musashi University
2004
Nagoya University
1998
A prospective randomized comparative study.To evaluate the effect of tranexamic acid (TXA) on decreasing perioperative blood loss in cervical laminoplasty, which surgical procedure is identical all cases.TXA, an inhibitor fibrinolysis, has proven to be effective reducing patients undergoing total hip and knee arthroplasty. However, only a limited number well-controlled spinal surgery trials have been conducted due heterogeneity performed procedures.Forty consecutive with compressive...
Water creates special problems for prebiotic chemistry, as it is thermodynamically favorable amide and phosphodiester bonds to hydrolyze. The availability of alternative solvents with more properties the formation molecules on early Earth may have helped bypass this so-called "water paradox". Formamide (FA) one such solvent, can serve a nucleobase precursor, but difficult envision how FA could been generated in large quantities or accumulated terrestrial surface environments. We report here...
Significance RNA may have been the original polymer to arise spontaneously on early Earth through natural geochemistry. Although direct physical evidence regarding Earth’s geochemistry is extremely limited, complex chemical reaction networks are thought played an important role in evolution. The present study demonstrates experimental model network that generates a number of compounds can lead synthesis single mixture starting from simple organic and inorganic feedstocks. Models this type...
Carbonaceous chondrites contain life's essential building blocks, including amino acids, and their delivery of organic compounds would have played a key role in emergence on Earth. Aqueous alteration carbonaceous is widespread process induced by the heat produced radioactive decay nuclides like 26Al. Simple ubiquitous molecules formaldehyde ammonia could produce various compounds, acids complex macromolecules. However, effects radiation such chemistry are unknown. Hence, gamma rays from...
Organic compounds, such as amino acids, are essential for the origin of life, and they may have been delivered to prebiotic Earth from extra-terrestrial sources, carbonaceous chondrites. In parent bodies chondrites, radioactive decays short-lived radionuclides, 26Al, cause melting ice, aqueous alteration occurs in early stages solar system formation. Many experimental studies shown that complex organic matter, including acids high-molecular-weight is produced by hydrothermal processes. On...
Abstract Chemical evolution, from simple molecules to complex systems, is fundamental modern origins of life research, and reaction networks are often supposed have operated on the early Earth. Herein, a variety compounds useful particularly for RNA synthesis − namely, cyanogen chloride, cyanamide, nitrile precursors sugars produced in short order by chemical network starting hydrogen cyanide driven gamma radiolysis. The radiolytic yield cyanamide was found be proportional concentration an...
Sugars play an indispensable role for all living organisms. Given that certain sugars have been identified in carbonaceous chondrites, these compounds might delivered to the early Earth via meteorites. The genesis of sugars, however, has a subject debate; they are considered either originated from UV irradiation interstellar ice or hydrothermal reactions within environments meteorite parent bodies. bodies chondrites contained water which underwent alteration as result internal warming most...
Amino acids have been detected in extraterrestrial bodies such as carbonaceous chondrites (CCs), which suggests that organics could be the source of first life on Earth, and interplanetary dust particles (IDPs) or micrometeorites (MMs) are promising carriers organic carbon. Some amino found CCs acid precursors, but these not well characterized. The Tanpopo mission was conducted Earth orbit from 2015 to 2019, stability glycine (Gly), hydantoin (Hyd), isovaline (Ival),...
Abstract We studied the radiolysis of a wide variety N-heterocycles, including many biological importance, and find that majority are remarkably stable in solid-state when subjected to large doses ionizing gamma radiation from 60 Co source. Degradation N-heterocycles as function dose rate total was measured using high-performance liquid chromatography with UV detection. Many show little degradation γ-irradiated up ~1 MGy, which approximates hundreds millions years’ worth emitted meteorite...
As a fundamental study for direct contact type of lead-bismuth-cooled fast reactor (PBWFR), the method gamma-ray radiography was applied to visualization nitrogen bubbles in lead-bismuth eutectic (LBE) vertical square duct with inner size 10×10×73.3 mm3. Nitrogen gas injected from bottom nozzle diameter 3mm at flow rate 0.13 0.40NL/min. γ–ray source, 60Co 11TBq used, and multi-crystal Gd2O2S (Tb) scintillator employed detection γ–ray. The bubble behavior visualized successfully by means this...
We are developing optical parts made of infrared-transmitting glass, which can be used in various fields science and other applications. Herein, spectral dispersers were fabricated from FI-02, is developed by Nippon Electric Glass Co., Ltd. The radiation test showed that FI-02 resistant to radiation. Further, a reflection coating produce an immersion grating was tested. designed, manufactured, evaluated prototype FI- 02. dimensions the 30 mm × 20 mm, pitch steps 0.217 mm. observed...
In nuclear-related facilities, many reinforced concrete shielding panels are used against radioactive rays. Some simultaneously serve as structural slabs or walls. Reinforced plates may crack due to the drying shrinkage of concrete, earthquakes, and other factors. The performance a cracked panel rays should be clarified. design process, engineering safety is based on knowledge research. If short, conservative assumptions large factors compensate shortage knowledge. On hand, it has recognized...
As a fundamental study for safety evaluation of water leak accident from steam generators lead alloy-cooled fast reactors (LFR) and gas lift bubbles in direct contact type LFR (PBWFR), behavior nitrogen bubble flow molten lead-bismuth pool rectangular vessel has been visualized by gamma-ray radiography.