Hiroko Koyama

1.2k total citations
56 papers, 870 citations indexed

About

Hiroko Koyama is a scholar working on Molecular Biology, Astronomy and Astrophysics and Organic Chemistry. According to data from OpenAlex, Hiroko Koyama has authored 56 papers receiving a total of 870 indexed citations (citations by other indexed papers that have themselves been cited), including 18 papers in Molecular Biology, 13 papers in Astronomy and Astrophysics and 10 papers in Organic Chemistry. Recurrent topics in Hiroko Koyama's work include Cosmology and Gravitation Theories (9 papers), Black Holes and Theoretical Physics (9 papers) and Catalytic Cross-Coupling Reactions (4 papers). Hiroko Koyama is often cited by papers focused on Cosmology and Gravitation Theories (9 papers), Black Holes and Theoretical Physics (9 papers) and Catalytic Cross-Coupling Reactions (4 papers). Hiroko Koyama collaborates with scholars based in Japan, United States and United Kingdom. Hiroko Koyama's co-authors include Akira Tomimatsu, Masaaki Suzuki, Masaaki Takahashi, Sean A. Hayward, Tetsuro Konishi, Hisashi Doi, Takamitsu Hosoya, Ryōji Noyori, Kengo Sumi and Y. Kuno and has published in prestigious journals such as Nature Communications, Applied Physics Letters and PLoS ONE.

In The Last Decade

Hiroko Koyama

56 papers receiving 835 citations

Peers

Hiroko Koyama
Dong Bai China
József Á. Balog Hungary
K. Nagashima Japan
David J. Gross United States
J. W. Harris United States
Saburo Higuchi Japan
Alex Lyakhovich Russia
Stephan C. Jahn United States
Yasuo Hara Japan
S. Taylor United States
Dong Bai China
Hiroko Koyama
Citations per year, relative to Hiroko Koyama Hiroko Koyama (= 1×) peers Dong Bai

Countries citing papers authored by Hiroko Koyama

Since Specialization
Citations

This map shows the geographic impact of Hiroko Koyama'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 Hiroko Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Hiroko Koyama more than expected).

Fields of papers citing papers by Hiroko Koyama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Hiroko Koyama. 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 Hiroko Koyama. The network helps show where Hiroko Koyama may publish in the future.

Co-authorship network of co-authors of Hiroko Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroko Koyama. A scholar is included among the top collaborators of Hiroko Koyama 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 Hiroko Koyama. Hiroko Koyama 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
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Yamada, Ryohei, Yuji O. Kamatari, Lee Wah Lim, et al.. (2024). Simple methods for measuring milk exosomes using fluorescent compound GIF-2250/2276. Biochemical and Biophysical Research Communications. 696. 149505–149505. 4 indexed citations
3.
Ogata, Aya, Takashi Yamada, Shinichi Imamura, et al.. (2024). A novel PET probe to selectively image heat shock protein 90α/β isoforms in the brain. EJNMMI Radiopharmacy and Chemistry. 9(1). 19–19. 3 indexed citations
4.
Ogata, Aya, Hiroko Koyama, Bin Ji, et al.. (2023). Synthesis and evaluation of a novel PET ligand, a GSK’963 analog, aiming at autoradiography and imaging of the receptor interacting protein kinase 1 in the brain. EJNMMI Radiopharmacy and Chemistry. 8(1). 31–31. 5 indexed citations
5.
Endo, Satoshi, Kazuya Fukasawa, Shigeo Takashima, et al.. (2023). ARL-17477 is a dual inhibitor of NOS1 and the autophagic-lysosomal system that prevents tumor growth in vitro and in vivo. Scientific Reports. 13(1). 10757–10757. 1 indexed citations
6.
Koyama, Hiroko, Yasuyuki Kimura, Aya Ogata, et al.. (2019). Synthesis of (R,S)-isoproterenol, an inhibitor of tau aggregation, as an 11C-labeled PET tracer via reductive alkylation of (R,S)-norepinephrine with [2-11C]acetone. Bioorganic & Medicinal Chemistry Letters. 29(16). 2107–2111. 5 indexed citations
7.
Furuta, Kyoji, et al.. (2017). Synthesis of 3-[4-(dimethylamino)phenyl]alkyl-2-oxindole derivatives and their effects on neuronal cell death. Bioorganic & Medicinal Chemistry Letters. 27(18). 4457–4461. 16 indexed citations
8.
Koyama, Hiroko, Hiroshi Toda, Masaki Hirano, et al.. (2017). Synthesis of PET probe O6-[(3-[11C]methyl)benzyl]guanine by Pd0-mediated rapid C-[11C]methylation toward imaging DNA repair protein O6-methylguanine-DNA methyltransferase in glioblastoma. Bioorganic & Medicinal Chemistry Letters. 27(9). 1892–1896. 5 indexed citations
9.
Shimizu, Mikiko, Akira Kato, Kazuya Motomura, et al.. (2017). Remote ischemic preconditioning protects human neural stem cells from oxidative stress. APOPTOSIS. 22(11). 1353–1361. 10 indexed citations
10.
Doi, Hisashi, Kengo Sato, Hideo Shindou, et al.. (2016). Blood–brain barrier permeability of ginkgolide: Comparison of the behavior of PET probes 7α-[18F]fluoro- and 10-O-p-[11C]methylbenzyl ginkgolide B in monkey and rat brains. Bioorganic & Medicinal Chemistry. 24(21). 5148–5157. 8 indexed citations
11.
Soeda, Yoshiyuki, Misato Yoshikawa, Osborne F. X. Almeida, et al.. (2015). Toxic tau oligomer formation blocked by capping of cysteine residues with 1,2-dihydroxybenzene groups. Nature Communications. 6(1). 10216–10216. 92 indexed citations
12.
Suzuki, Masaaki, Hideki Ishii, Chika Watanabe, et al.. (2014). Synthesis of 11C-labeled retinoic acid, [11C]ATRA, via an alkenylboron precursor by Pd(0)-mediated rapid C-[11C]methylation. Bioorganic & Medicinal Chemistry Letters. 24(15). 3622–3625. 12 indexed citations
13.
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Yamada, Kazunori, Hiroko Koyama, Kyoji Hagiwara, et al.. (2012). Identification of a novel compound with antiviral activity against influenza A virus depending on PA subunit of viral RNA polymerase. Microbes and Infection. 14(9). 740–747. 27 indexed citations
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16.
Kotake, Yaichiro, Takamitsu Hosoya, Toshiyuki Hiramatsu, et al.. (2010). 1‐Benzyl‐1,2,3,4‐tetrahydroisoquinoline binds with tubulin β, a substrate of parkin, and reduces its polyubiquitination. Journal of Neurochemistry. 114(5). 1291–1301. 23 indexed citations
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18.
Koyama, Hiroko & Tetsuro Konishi. (2006). Formation of fractal structure in many-body systems with attractive power-law potentials. Physical Review E. 73(1). 16213–16213. 1 indexed citations
19.
Koyama, Hiroko & Tetsuro Konishi. (2001). Emergence of power-law correlation in 1-dimensional self-gravitating system. Physics Letters A. 279(3-4). 226–230. 23 indexed citations
20.
Nakano, Nobuhiro, Norifumi Shirasaka, Hiroko Koyama, et al.. (2000). C19 Odd-chain Polyunsaturated Fatty Acids (PUFAs) Are Metabolized to C21-PUFAs in a Rat Liver Cell Line, and Curcumin, Gallic Acid, and Their Related Compounds Inhibit Their Desaturation. Bioscience Biotechnology and Biochemistry. 64(8). 1641–1650. 14 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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