A5090322992- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- IgG4-Related and Inflammatory Diseases
- Insect and Arachnid Ecology and Behavior
- Groundwater and Isotope Geochemistry
- Vascular Anomalies and Treatments
- Fetal and Pediatric Neurological Disorders
- Lymphatic Disorders and Treatments
- Pancreatitis Pathology and Treatment
- Insects and Parasite Interactions
- Biliary and Gastrointestinal Fistulas
- Myasthenia Gravis and Thymoma
- Mass Spectrometry Techniques and Applications
- Mercury impact and mitigation studies
- Gallbladder and Bile Duct Disorders
- Spinal Dysraphism and Malformations
- Brain Metastases and Treatment
- Insect Utilization and Effects
- Pediatric Hepatobiliary Diseases and Treatments
- Chronic Lymphocytic Leukemia Research
- Radioactive element chemistry and processing
- Medical Imaging and Pathology Studies
Okayama University
1995-2024
Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned C-type asteroid Ryugu by Hayabusa2 mission. On average consist 50% phyllosilicate matrix, 41% porosity 9% minor phases, including organic matter. The abundances 70 elements in close agreement with those CI chondrites. Bulk show higher δ18O, Δ17O, ε54Cr values than As such, sampled most primitive least-thermally processed protosolar nebula reservoirs. Such finding is...
All life on Earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of Earth. While many meteoritic are considered indigenous, deciphering extent terrestrial contamination remains an issue. The Ryugu asteroid fragments (JAXA Hayabusa2 mission), represent most uncontaminated primitive extraterrestrial material available. Here, concentrations from two particles different touchdown sites (TD1 TD2) reported. show that N,N-dimethylglycine...
Abstract The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge evolution early solar system materials. However, no consensus been obtained on chronological data, which is important for understanding Ryugu. Here, aqueous alteration age particles was determined by Mn–Cr method using bulk samples, yielding an 4.13 + 0.62/−0.55 Myr after formation Ca–Al-rich inclusions (CAI). corresponds to 4563.17 0.60/−0.67 ago. higher 55 Mn/ 52 Cr, ε 54 and...
Unmetamorphosed carbonaceous chondrites provide important information concerning the formation and evolution of organic matter, such as amino acids. However, terrestrial contamination remains a valid concern when investigating inventory meteorites that have fallen to Earth. Accordingly, JAXA’s Hayabusa2 NASA’s OSIRIS-REx been launched with task returning uncontaminated C-type asteroid material The successful mission has very limited sample size (5.4 g). Therefore, many...
A comprehensive geochemical study of the Chelyabinsk meteorite reveals further details regarding its history impact-related fragmentation and melting, later aqueous alteration, during transit toward Earth. We support an ∼30 Ma age obtained by Ar-Ar method (Beard et al., 2014) for based on Rb-Sr isotope analyses a melt domain. An irregularly shaped olivine with distinct O composition in domain appears to be fragment silicate-rich impactor. Hydrogen Li concentrations isotopic compositions,...
Sample decomposition using inverse aqua regia at elevated temperatures and pressures (e.g., Carius tube or high‐pressure asher) is the most common method used to extract highly siderophile elements (HSEs: Ru, Rh, Pd, Re, Os, Ir, Pt Au) from geological samples. Recently, it has been recognised that additional HF desilicification necessary better recover HSEs, potentially contained within silicate oxide minerals in mafic samples, which cannot be dissolved solely by . However, abundance of...
To precisely determine the abundances of fifty‐two elements found within natural water samples, with mass fractions down to fg g −1 level, we have developed a method which combines freeze‐drying pre‐concentration (FDC) and isotope dilution internal standardisation (ID‐IS). By sublimation H 2 O, sample solution was reduced < 1/50 original volume. element abundance accuracy better than 10%, that for solutions being analysed by spectrometry HNO 3 concentration should be > 0.3 mol l avoid...
The Hayabusa2 mission returned primitive samples from the C-type asteroid Ryugu to Earth. asteroids hold clues origin of Earth’s water and building blocks life. rubble pile structure is a crucial physical feature relating their evolution. A hypothesized be bound primarily by self-gravity with significant void space among irregularly shaped materials after catastrophic impacts between larger asteroids. However, geological observations analyses sample revealed that high microporosity was...
1. 昆虫病原性糸状菌Beauveria brongniartii GSES株を培養した不織布シートのキボシカミキリ成虫に対する殺虫効果を実験室内と野外のイチジク圃場で検討した。2. 生存分生子数7.1×107/cm2の分生子浮遊液を虫体の一部に塗布し感染経路を調査した。触角,腹部および〓節へ塗布した成虫は高率に死亡したが,口器へ塗布した成虫は死亡率が低かった。3. 生存分生子数が2.5×106個/cm2以上の不織布シート上を5秒間歩行した成虫は高率に死亡した。しかし,2.5×106個/cm2のシートの場合,死亡までの期間が1.6×107個/cm2以上のシートに比べて遅延した。4. 野外のイチジク圃場に施用した不織布シート上の生存分生子数は,施用後31日目には施用前の約1/10 (106個/cm2)に減少した5. 不織布シート施用後10日目に野外のイチジク圃場から採集したキボシカミキリ成虫は84%が死亡し,77%の成虫に菌糸の叢生がみられた。しかし,施用後31日目には採集虫の死亡率および菌糸を叢生した虫率が低下し,不織布の殺虫活性維持期間は1か月程度であるものと考えられた。
Abstract Sample return missions represent great opportunities to study terrestrially uncontaminated solar system materials. However, the size of returned samples will be limited, and thus, it is necessary understand most appropriate techniques apply. Accordingly, sensitivity laser ablation inductively coupled plasma mass spectrometry (LA‐ICPMS) secondary ion (SIMS) was compared through analyses trace elements in reference materials Allende CV3 chondrite. While SIMS method found more...
昆虫病原性糸状菌B....
症例は, 60歳, 男性.1992年11月の検診にて胸部X線写真の異常陰影を指摘され当科へ紹介された.気管支鏡検査で左S6に発生した扁平上皮癌と診断された。左下葉切除術とR2aリンパ節郭清が行われた.術後1日目の夕方から経口摂取を開始したところ, 術後2日目になって両側に乳糜胸が発生したため右側も胸腔ドレナージを施行した.以後, 保存的加療を行ったところ術後7日目には乳糜の流出が止まった.自験例のように両側に乳糜胸が発生した原因として, 気管分岐部のリンパ節腫大が著しかったためその郭清が対側近くにまで及んでしまい, 対側の開胸となって損傷した胸管から乳糜が流れこんだと考えられた.肺癌手術時のリンパ節郭清においては, 胸管の走行を念頭においた慎重な手術操作が必要であり, 特に, 気管分岐部においては結紮を多用して慎重に行うべきである。自験例では, 全身状態や残存肺の膨張が良好であったため保存的に治癒した.