Koichi Ohara

2.1k total citations · 1 hit paper
25 papers, 1.4k citations indexed

About

Koichi Ohara is a scholar working on Cellular and Molecular Neuroscience, Molecular Biology and Psychiatry and Mental health. According to data from OpenAlex, Koichi Ohara has authored 25 papers receiving a total of 1.4k indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Cellular and Molecular Neuroscience, 10 papers in Molecular Biology and 8 papers in Psychiatry and Mental health. Recurrent topics in Koichi Ohara's work include Receptor Mechanisms and Signaling (7 papers), Neurotransmitter Receptor Influence on Behavior (7 papers) and Bipolar Disorder and Treatment (4 papers). Koichi Ohara is often cited by papers focused on Receptor Mechanisms and Signaling (7 papers), Neurotransmitter Receptor Influence on Behavior (7 papers) and Bipolar Disorder and Treatment (4 papers). Koichi Ohara collaborates with scholars based in Japan, Canada and United States. Koichi Ohara's co-authors include James R. Bunzow, Hubert H.M. Van Tol, Hyman B. Niznik, Philip Seeman, Kristen M. Kennedy, Hong‐Chang Guan, Olivier Civelli, Kenshiro Ohara, Kunihiko Tani and Yasuo Suzuki and has published in prestigious journals such as Nature, Journal of Biological Chemistry and Biological Psychiatry.

In The Last Decade

Koichi Ohara

25 papers receiving 1.4k citations

Hit Papers

Multiple dopamine D4 receptor variants in the human popul... 1992 2026 2003 2014 1992 250 500 750
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Multiple dopamine D4 receptor variants in the human population
    1992 754 citations Hubert H.M. Van Tol, Hong‐Chang Guan et al. Nature profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Koichi Ohara Japan 16 740 525 457 249 211 25 1.4k
Olga Okladnova Germany 15 555 0.8× 398 0.8× 243 0.5× 224 0.9× 238 1.1× 21 1.2k
Kaj Forslund Sweden 18 514 0.7× 326 0.6× 501 1.1× 343 1.4× 233 1.1× 31 1.4k
Ursula M. D’Souza United Kingdom 20 697 0.9× 527 1.0× 506 1.1× 219 0.9× 301 1.4× 34 1.7k
Myoung‐Sun Roh South Korea 17 442 0.6× 667 1.3× 365 0.8× 279 1.1× 254 1.2× 25 1.7k
Tiina Pohjalainen Finland 14 908 1.2× 404 0.8× 428 0.9× 298 1.2× 154 0.7× 15 1.7k
Elena Michaelovsky Israel 23 430 0.6× 541 1.0× 356 0.8× 418 1.7× 275 1.3× 38 1.4k
Shijuan Wu United States 15 451 0.6× 308 0.6× 503 1.1× 486 2.0× 194 0.9× 18 1.4k
Vida Asghari Canada 7 439 0.6× 394 0.8× 411 0.9× 232 0.9× 165 0.8× 9 1.2k
Helge Neidt Germany 15 564 0.8× 265 0.5× 217 0.5× 174 0.7× 160 0.8× 22 984
Ernst Franzek Germany 26 560 0.8× 502 1.0× 918 2.0× 310 1.2× 421 2.0× 83 2.2k

Countries citing papers authored by Koichi Ohara

Since Specialization
Citations

This map shows the geographic impact of Koichi Ohara's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koichi Ohara with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koichi Ohara more than expected).

Fields of papers citing papers by Koichi Ohara

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koichi Ohara. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koichi Ohara. The network helps show where Koichi Ohara may publish in the future.

Co-authorship network of co-authors of Koichi Ohara

This figure shows the co-authorship network connecting the top 25 collaborators of Koichi Ohara. A scholar is included among the top collaborators of Koichi Ohara based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koichi Ohara. Koichi Ohara is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Ohara, Koichi, et al.. (2000). Polymorphism in the promoter region of the alpha2A-adrenergic receptor gene and panic disorders. Psychiatry Research. 93(1). 79–82. 16 indexed citations
2.
Ohara, Koichi, Koichi Ohara, Yasuo Suzuki, et al.. (2000). Presenilin-1 in late-onset depressive disorder. Psychiatry Research. 95(1). 83–86. 2 indexed citations
3.
Ohara, Koichi, Takeshi Ikeuchi, Yasuo Suzuki, et al.. (2000). A CAG trinucleotide repeat expansion and familial schizophrenia. Psychiatry Research. 94(3). 257–262. 3 indexed citations
4.
Ohara, Koichi, Koichi Ohara, Yasuo Suzuki, et al.. (1999). A variable-number-tandem-repeat of the serotonin transporter gene and anxiety disorders. Progress in Neuro-Psychopharmacology and Biological Psychiatry. 23(1). 55–65. 57 indexed citations
5.
Ohara, Koichi, Koichi Ohara, Yasuo Suzuki, et al.. (1999). Lack of association between α1-antichymotrypsin polymorphism and late-onset depressive disorder. Psychiatry Research. 88(3). 221–226. 3 indexed citations
6.
Ohara, Koichi, et al.. (1998). Anticipation and imprinting in Japanese familial mood disorders. Psychiatry Research. 79(3). 191–198. 26 indexed citations
7.
Zhang, Haiyin, Tatsuya Ishigaki, Kunihiko Tani, et al.. (1997). Serotonin2A receptor gene polymorphism in mood disorders. Biological Psychiatry. 41(7). 768–773. 84 indexed citations
8.
Ohara, Koichi, et al.. (1997). Anticipation and imprinting in schizophrenia. Biological Psychiatry. 42(1). 100S–100S. 4 indexed citations
9.
Ohara, Koichi. (1997). Analysis of the 5′-Flanking Promoter Region of the 5-HT2A Receptor Gene in Schizophrenia. Neuropsychopharmacology. 17(4). 274–278. 9 indexed citations
10.
Ohara, Koichi, Koichi Ohara, Haiyin Zhang, et al.. (1996). Polymorphisms of dopamine D2-like (D2, D3, and D4) receptors in schizophrenia. Biological Psychiatry. 40(12). 1209–1217. 37 indexed citations
11.
Fujiwara, Hiroshi, et al.. (1994). Cardiotoxicity of long-term intravenous administration of FK506 in rabbits: dose relationship and recovery after discontinuance.. PubMed. 26(2). 855–7. 15 indexed citations
12.
Ohara, Koichi & Charles P. Slichter. (1994). Reexamination of Motional Averaging in Magnetic Resonance. Journal of Magnetic Resonance Series A. 109(1). 74–79. 2 indexed citations
13.
Petronis, Artūras, Koichi Ohara, Cathy L. Barr, James L. Kennedy, & Hubert H.M. Van Tol. (1994). (G)n-Mononucleotide polymorphism in the human D4 dopamine receptor (DRD4) gene. Human Genetics. 93(6). 719–719. 18 indexed citations
14.
Ohara, Koichi, et al.. (1994). The middle‐aged generation is at high risk for suicide in Japan. Acta Psychiatrica Scandinavica. 90(1). 14–15. 6 indexed citations
15.
Asghari, Vida, Oscar Schoots, Koichi Ohara, et al.. (1994). Dopamine D4 receptor repeat: analysis of different native and mutant forms of the human and rat genes.. Molecular Pharmacology. 46(2). 364–373. 157 indexed citations
16.
Seeman, Philip, Koichi Ohara, Carla Ulpian, et al.. (1993). Schizophrenia: Normal Sequence in the Dopamine D2 Receptor Region that Couples to G-Proteins. DNA Polymorphisms in D2. Neuropsychopharmacology. 8(2). 137–142. 33 indexed citations
17.
Suzuki, Yasuo, et al.. (1992). Circadian Variation in Plasma Homovanillic Acid Level During and After Alcohol Withdrawal in Alcoholic Patients. Alcoholism Clinical and Experimental Research. 16(6). 1047–1051. 20 indexed citations
18.
Tol, Hubert H.M. Van, Hong‐Chang Guan, Koichi Ohara, et al.. (1992). Multiple dopamine D4 receptor variants in the human population. Nature. 358(6382). 149–152. 754 indexed citations breakdown →
19.
Pietraszek, M.H., et al.. (1991). Fibrinolytic activity in depression and neurosis. Thrombosis Research. 63(6). 661–666. 16 indexed citations
20.
Ohara, Koichi, Kazuko Haga, Gabriel Berstein, et al.. (1988). The interaction between D-2 dopamine receptors and GTP-binding proteins.. Molecular Pharmacology. 33(3). 290–296. 53 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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