{"id":"https://openalex.org/A5111560045","orcid":null,"observed_orcids":[],"display_name":"Akio Koyama","raw_author_names":["A Koyama","A. Koyama","Akio Koyama"],"full_name":"Akio Koyama","works_count":12,"cited_by_count":426,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":6,"i10_index":5},"ids":{"openalex":"https://openalex.org/A5111560045","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I146399215","ror":"https://ror.org/02956yf07","display_name":"University of Tsukuba","country_code":"JP","type":"education","lineage":["https://openalex.org/I146399215"]},"years":[2008,2007,1999,1991]},{"institution":{"id":"https://openalex.org/I31784960","ror":"https://ror.org/04nt8b154","display_name":"Fukuoka University","country_code":"JP","type":"education","lineage":["https://openalex.org/I31784960"]},"years":[2007]},{"institution":{"id":"https://openalex.org/I4210087348","ror":"https://ror.org/0025ww868","display_name":"National Cancer Centre Japan","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210087348"]},"years":[2012]},{"institution":{"id":"https://openalex.org/I4210093896","ror":"https://ror.org/00kcd6x60","display_name":"Tohoku University Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210093896"]},"years":[2008]},{"institution":{"id":"https://openalex.org/I4210119531","ror":"https://ror.org/022a11m05","display_name":"Iwaki Kyoritsu General Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210119531"]},"years":[2018,2008]},{"institution":{"id":"https://openalex.org/I4210124716","ror":"https://ror.org/02skgb336","display_name":"Kamituga General Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210124716"]},"years":[1998]},{"institution":{"id":"https://openalex.org/I4210145079","ror":"https://ror.org/03rm3gk43","display_name":"National Cancer Center Hospital East","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210145079"]},"years":[2012]},{"institution":{"id":"https://openalex.org/I4210166463","ror":"https://ror.org/05rkz5e28","display_name":"Toranomon Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210166463"]},"years":[2019]}],"last_known_institutions":[{"id":"https://openalex.org/I4210166463","ror":"https://ror.org/05rkz5e28","display_name":"Toranomon Hospital","country_code":"JP","type":"healthcare","lineage":["https://openalex.org/I4210166463"]}],"topics":[{"id":"https://openalex.org/T10445","display_name":"Antioxidant Activity and Oxidative Stress","count":3,"subfield":{"id":"https://openalex.org/subfields/2704","display_name":"Biochemistry (medical)"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11029","display_name":"Renal Diseases and Glomerulopathies","count":3,"subfield":{"id":"https://openalex.org/subfields/2727","display_name":"Nephrology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11884","display_name":"Redox biology and oxidative stress","count":3,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10436","display_name":"Anesthesia and Sedative Agents","count":2,"subfield":{"id":"https://openalex.org/subfields/2703","display_name":"Anesthesiology and Pain Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10189","display_name":"Anesthesia and Pain Management","count":1,"subfield":{"id":"https://openalex.org/subfields/2703","display_name":"Anesthesiology and Pain Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"topic_share":[{"id":"https://openalex.org/T11884","display_name":"Redox biology and oxidative stress","value":1.36e-05,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T12117","display_name":"Muscle and Compartmental Disorders","value":1.35e-05,"subfield":{"id":"https://openalex.org/subfields/2746","display_name":"Surgery"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11142","display_name":"Advanced Glycation End Products research","value":1.19e-05,"subfield":{"id":"https://openalex.org/subfields/1308","display_name":"Clinical Biochemistry"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T12082","display_name":"Takotsubo Cardiomyopathy and Associated Phenomena","value":1.02e-05,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11485","display_name":"Gastrointestinal Tumor Research and Treatment","value":1e-05,"subfield":{"id":"https://openalex.org/subfields/2715","display_name":"Gastroenterology"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}}],"x_concepts":[{"id":"71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","score":0.968869686126709},{"id":"185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","score":0.828018069267273},{"id":"42219234","wikidata":"https://www.wikidata.org/wiki/Q131130","display_name":"Anesthesia","score":0.7820667028427124},{"id":"126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","score":0.680856466293335},{"id":"55493867","wikidata":"https://www.wikidata.org/wiki/Q7094","display_name":"Biochemistry","score":0.3857969343662262}],"counts_by_year":[{"year":1979,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1980,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1988,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1991,"works_count":1,"oa_works_count":1,"cited_by_count":0},{"year":1998,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1999,"works_count":1,"oa_works_count":1,"cited_by_count":0},{"year":2007,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2008,"works_count":2,"oa_works_count":1,"cited_by_count":0},{"year":2012,"works_count":1,"oa_works_count":1,"cited_by_count":16},{"year":2013,"works_count":0,"oa_works_count":0,"cited_by_count":15},{"year":2014,"works_count":0,"oa_works_count":0,"cited_by_count":10},{"year":2015,"works_count":0,"oa_works_count":0,"cited_by_count":16},{"year":2016,"works_count":0,"oa_works_count":0,"cited_by_count":16},{"year":2017,"works_count":0,"oa_works_count":0,"cited_by_count":13},{"year":2018,"works_count":1,"oa_works_count":0,"cited_by_count":16},{"year":2019,"works_count":1,"oa_works_count":0,"cited_by_count":20},{"year":2020,"works_count":0,"oa_works_count":0,"cited_by_count":11},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":22},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":15},{"year":2023,"works_count":0,"oa_works_count":0,"cited_by_count":9},{"year":2024,"works_count":0,"oa_works_count":0,"cited_by_count":8},{"year":2025,"works_count":0,"oa_works_count":0,"cited_by_count":13},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":6}],"display_name_alternatives":["A Koyama","A. Koyama","Akio Koyama"],"block_key":"a koyama","works_api_url":"https://api.openalex.org/works?filter=author.id:A5111560045","awards_count":0,"awards_api_url":"https://api.openalex.org/awards?filter=investigators.author.id:A5111560045","updated_date":"2026-11-10T14:30:39","created_date":"2016-06-24T00:00:00"}