Kei Odawara

Hot Springs Research Institute of Kanagawa Prefecture

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Yasufumi Iryu

Tohoku University

Hiroki Matsuda

Osaka University

Tokiyuki Sato

Akita University

Hideaki Machiyama

Japan Agency for Marine-Earth Science and Technology

Ryuji Asami

Tohoku University

Noël P. James

Queen's University

Naotomo Kaneko

Geological Survey of Japan

Tanio Ito

Shizuoka University

Shunsuke F. Mawatari

Hokkaido University

Akiko Omura

University of Tsukuba

Cooperative Institutions

St. Marianna University School of Medicine

Tohoku University

The University of Tokyo

Keio University

National Center For Child Health and Development

Tokai University

Nagoya University

Czech Academy of Sciences, Institute of Geology

Hot Springs Research Institute of Kanagawa Prefecture

Kyoto University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Pleistocene coral reef deposite (the Ryukyu Group) on Yoron-jima, Kagoshima Prefecture, Japan.

The Journal of the Geological Society of Japan (1999)

Kei Odawara Yasufumi Iryu

与論島には, 第四紀更新世のサンゴ礁性堆積物とその同時異相の陸源性砕屑物よりなる琉球層群が広く分布する.与論島の琉球層群は3つの地層群に大別される.最下位の宇勝層と麦屋層は, 部分的にカルスト化したサンゴ石灰岩よりなり, 模式地付近に小規模に露出する.与論島層は島の琉球層群の主体を占め, 島内に広く分布する.同層は宇勝層と麦屋層を不整合に覆い, 層厚は55mに達する.同層は3つのユニットに細分され, 各ユニットは島の中央部側に位置するサンゴ石灰岩と沖合側に分布する石灰藻球石灰岩・Cycloclypeus-Operculina石灰岩・砕屑性石灰岩より構成される.チチ崎層と供利層は与論島層の上に不整合で重なり, 主にサンゴ石灰岩からなる.層位学的位置および石灰質ナンノ化石より, 与論島層は沖永良部島や徳之島の琉球層群主部と対比される可能性がある.他層の地質年代は不明である.

10.5575/geosoc.105.273

Cite

Citations (14)

Carbonate mineralogy and stable isotope composition of cool-water bryozoans from sediments of ODP Leg 182 sites

Hideaki Machiyama Tsutomu Yamada Naotomo Kaneko Yasufumi Iryu Kei Odawara

10.1594/pangaea.786019

Cite

Citations (0)

Erratum : Geologic ages of the Chinen Formation and the “Reddish Limestone” in Komesu and Giza areas in southern Okinawa-jima based on calcareous nannofossil biostratigraphy

The Journal of the Geological Society of Japan (2005)

Kei Odawara Yasufumi Iryu Hiroki Matsuda Tokiyuki Sato Shun Chiyonobu

お詫びと訂正地質学雑誌111巻4号掲載の小田原ほか論文(p.224-233),Fig. 1 キャプション(p.225)において,校正段階での著者校正指示が,修正されないまま掲載されてしまいました.ここに訂正し,お詫び申し上げます.(誤)Fig. 1. Location map of the study area(after 1:25,000 scale topographic maps, "kyan-misaki" and "Itoman" published by the Geographical Survey Institute, Ministry of Land, Infrastructure, and Transport, Japan).(正)Fig. 1. Location map of the study area(after 1:25,000 scale topographic maps, "Kyan-misaki" and "Itoman", published by the Geographical Survey Institute, Ministry of Land, Infrastructure, and Transport, Japan).(地質学雑誌編集委員会)

Christian ministry

Geologic map

Geological survey

10.5575/geosoc.erratum_2005.02

Cite

Citations (3)

Survey of understanding and awareness of fertility preservation in pediatric patients: Is conversation about fertility preservation unpleasant for pediatric patients?

Frontiers in Endocrinology (2023)

Seido Takae Yuriko Iwahata Yodo Sugishita Hideyuki Iwahata Ryo Kanamori

Objective To verify understanding and awareness of fertility preservation (FP) in pediatric patients undergoing FP treatments. Methods A questionnaire survey was conducted before and after explanation of fertility issues and FP treatments for patients 6–17 years old who visited or were hospitalized for the purpose of ovarian tissue cryopreservation (OTC) or oocyte cryopreservation (OC), or sperm cryopreservation between October 2018 and April 2022. This study was approved by the institutional review board at St. Marianna University School of Medicine (No. 4123, UMIN000046125). Result Participants in the study comprised 36 children (34 girls, 2 boys). Overall mean age was 13.3 ± 3.0 years. The underlying diseases were diverse, with leukemia in 14 patients (38.9%), brain tumor in 4 patients (11.1%). The questionnaire survey before the explanation showed that 19 patients (52.8%) wanted to have children in the future, but 15 (41.7%) were unsure of future wishes to raise children. And most children expressed some degree of understanding of the treatment being planned for the underlying disease (34, 94.4%). Similarly, most children understood that the treatment would affect their fertility (33, 91.7%). When asked if they would like to hear a story about how to become a mother or father after FP which including information of FP, half answered “Don’t mind” (18, 50.0%). After being provided with information about FP treatment, all participants answered that they understood the adverse effects on fertility of treatments for the underlying disease. Regarding FP treatment, 32 children (88.9%) expressed understanding for FP and 26 (72.2%) wished to receive FP. “Fear” and “Pain” and “Costs” were frequently cited as concerns about FP. Following explanations, 33 children (91.7%) answered “Happy I heard the story” and no children answered, “Wish I hadn’t heard the story”. Finally, 28 of the 34 girls (82.4%) underwent OTC and one girl underwent OC. Discussion The fact that all patients responded positively to the explanations of FP treatment is very informative. This is considered largely attributable to the patients themselves being involved in the decision-making process for FP. Conclusions Explanations of FP for children appear valid if age-appropriate explanations are provided.

Oocyte cryopreservation

Ovarian Tissue Cryopreservation

Affect

Fertility clinic

Oncofertility

10.3389/fendo.2022.1074603

Cite

Citations (3)

Geographical Features of the Hakonemachi Fault at the Bottom of Lake Ashi in the Hakone Volcano

Journal of Geography (Chigaku Zasshi) (2010)

Daiji Hirata Hiroyuki Yamashita Izumi Sakamoto Kei Odawara Yoshiyuki Takino

The bottom topography of lake Ashi-no-ko, in the Hakone volcano caldera, was examined using the SeaBat8101 narrow multi-beam sonar system. The purpose of micro-topographical observations of the lake bottom is to understand the tectonic relations between the historical formation-process of the caldera and the strike-slip motion in the Tanna-Hirayama active fault system. At the southeastern part of the lake, west of the Dougashima, undulations at the bottom such as swells, hollows, and stairs extending in the northwest-southeast direction, were observed. These bottom-forms show a northern extension of the Hakonemachi active fault, running along the east side of lake Ashi-no-ko. They may correspond to one of the north spray faults of the Kita-Izu active fault system, which is the source of the A.D.1930 Kita-Izu earthquake, and to motions of the western margin of the Manazuru micro-plate, in relation to caldera formation as a strike-slip basin.

Caldera

10.5026/jgeography.119.911

Cite

Citations (0)

Stratigraphy of the Ryukyu Group in Maeda-misaki area, Okinawa jima, Ryukyu Islands, Japan

Journal of the Japanese Coral Reef Society (2005)

Atsuko Muraoka Yasufumi Iryu Kei Odawara Tsutomu Yamada Tokiyuki Sato

The Pleistocene Ryukyu Group consisting mainly of reef-complex deposits is exposed in Maeda-misaki area, central part of Okinawa-jima, Ryukyu Islands, southwestern Japan. The Pleistocene sequence, unconformably overlying pre-Tertiary phyllite of the Nago Formation, comprises the Quaternary Ryukyu Group and Holocene beach and alluvial deposits in this area. The Ryukyu Group consists of the Sobe Formation which is unconformably overlain by younger limestones. The Sobe Formation, the main body of the group, reaches 35m in thickness and crops out at elevations of up to 90m. Five lithologic units have been identified in the carbonate sequence of the Sobe Formation in the neighboring area Yomitan and are numbered sequentially from the base upwards (Units 1-5). Of these, four units (Units 2-5) extend in the study area. Unit 2 is composed chiefly of conglomerate and sandy to gravelly limestone. Each of Units 3 and 4 consists of shallow-water coral limestone grading upward into deep-water deposits (rhodolith, Cycloclypeus-Operculina, and detrital limestones). Unit 5 is composed exclusively of coral limestone. The younger limestones are less than 4m in thickness, rest unconformably on the Sobe Formation, and include detrital and coral limestones. These limestones are found at 3 sites at elevations of <-30m on the coast of the study area. The stratigraphic relationship between the detrital and coral limestones remains unknown due to their limited occurrences. Nannofossil biostratigraphy indicates the sandy limestone of Unit 2 of the Sobe Formation ranges in age from 0.41 to 1.65Ma.

Conglomerate

Phyllite

Lithology

Stromatolite

Stratigraphic unit

10.3755/jcrs.2005.23

Cite

Citations (3)

Geological structure of the Izu collision zone, northern border of the Izu block, southern Kanto, Japan

The Journal of the Geological Society of Japan (2011)

Kei Odawara Hiroki Hayashi Yusuke Izaki Makoto Someno Tanio Ito

神奈川県西部から静岡県東部にかけての地域は，伊豆弧と本州弧の衝突帯に位置し，様々な活構造が分布する．特に神縄断層や国府津-松田断層，およびそれら断層によって分布を規制される更新統の足柄層群については，伊豆弧衝突の最前線として，島弧衝突帯のテクトニクスに関する様々な研究成果が報告されてきた．近年，大規模な地下構造探査プロジェクトにより，この地域のプレート構造について新たな知見が得られ，再び注目を集めている．本見学旅行では，本地域に分布する活断層の露頭や足柄層群に挟在される火砕流堆積物を見学し，本地域の衝突テクトニクスに関して議論する．

10.5575/geosoc.117.s135

Cite

Citations (2)

MicroRNAs secreted by human preimplantation embryos and IVF outcome

Reproductive Biology and Endocrinology (2022)

Shintaro Kamijo Toshio Hamatani Hiroyuki Sasaki Hiroki Suzuki Akane Abe

To generate an effective embryo prediction model and identify a non-invasive evaluation method by analyzing microRNAs (miRNAs) in embryo culture medium.Analysis of microRNA profiles from spent culture medium of blastocysts with good morphology that did or did not result in pregnancy.Clinical and experimental research.Sixty patients who underwent thawed embryo transfer of blastocysts after intracytoplasmic sperm injection.None.The association of miRNA abundance levels secreted by blastocysts in culture medium and implantation success.Our RNA sequencing analysis found a total of 53 differentially expressed miRNAs in the culture media of pregnancy and non-pregnancy groups. Twenty-one miRNAs were analyzed for their potential to predict implantation success. Eight miRNAs (hsa-miR-191-5p, hsa-miR-320a, hsa-miR-92a-3p, hsa-miR-509-3p, hsa-miR-378a-3p, hsa-miR-28-3p, hsa-miR-512-5p, and hsa-miR-181a-5p) were further extracted from the results of a logistic regression analysis of qPCR Ct values. A prediction model for high-quality blastocysts was generated using the eight miRNAs, with an average accuracy of 0.82 by 5-fold cross validation.We isolated blastocyst miRNAs that may predict implantation success and created a model to predict viable embryos. Increasing the number of investigated cases and further studying the effect of each miRNA on embryonic development is needed to refine the miRNA-based predictive model.

Embryo quality

Inner cell mass

10.1186/s12958-022-00989-0

Cite

Citations (13)

沖縄本島南部に分布する琉球層群の層序

The Journal of the Geological Society of Japan (2012)

Kenichi Sagae Marc Humblet Kei Odawara Shun Chiyonobu Tokiyuki Sato

沖縄本島南部には,主に第四紀更新世のサンゴ礁複合体堆積物からなる琉球層群が広く分布する.本地域の琉球層群は,糸満層,那覇層,港川層よりなる.糸満層は本地域内に散点的に分布し,主に溶解・侵食を受け赤色化した現地性の皮殻状無節サンゴモに富む石灰岩からなり,層厚は2 mを超える.那覇層は糸満層と不整合ないし同時異相の関係にあり,その分布高度は約170 m,層厚は50 mに達する.本層は4つのユニットの累重体であり,ユニット1~3は浅海相であるサンゴ石灰岩から沖合相である石灰藻球・Cycloclypeus-Operculina・砕屑性石灰岩へと上方深海化する整合一連のシーケンスよりなり,ユニット4は沖合相のみから構成される.石灰質ナンノ化石生層序は,那覇層の堆積は1.392~1.706 Maに始まり,0.853 Ma以降まで継続したことを示す.港川層は港川と喜屋武岬西方に分布し,層厚は約20 mに及ぶが,分布標高は50mを超えない.本層の地質年代は不明である.

10.5575/geosoc.2011.0009

Cite

Citations (10)

(Table T1-3) Stable carbon and oxygen isotope ratios of cool-water Bryozoa Idmidronea spp. from ODP Leg 182 sites

Hideaki Machiyama Tsutomu Yamada Naotomo Kaneko Yasufumi Iryu Kei Odawara

Table (database)

Bryozoa

10.1594/pangaea.786017

Cite

Citations (0)