Hiroko Koyama

1.2k citations

56 papers · 870 indexed · h-index 16

Nuclear and High Energy Physics top 5%
- Black Holes and Theoretical Physics 9
Astronomy and Astrophysics top 5%
- Cosmology and Gravitation Theories 9
- Pulsars and Gravitational Waves Research 4
Statistical and Nonlinear Physics top 10%
- Quantum chaos and dynamical systems 4
Organic Chemistry
- Catalytic Cross-Coupling Reactions 4
- Coordination Chemistry and Organometallics 4
- Organoboron and organosilicon chemistry 3
Physiology
Genetics
- Glioma Diagnosis and Treatment 3

Co-authors: Akira Tomimatsu Masaaki Suzuki Masaaki Takahashi Sean A. Hayward Tetsuro Konishi Hisashi Doi Takamitsu Hosoya Ryōji Noyori
Cited by: Nuclear and High Energy Physics Astronomy and Astrophysics Statistical and Nonlinear Physics
Partner nations: Japan United States United Kingdom

In The Last Decade

Hiroko Koyama

56 papers receiving 835 citations

Peers

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

The 25 scholars most cited alongside Hiroko Koyama, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Hiroko Koyama Line = papers co-authored together Hiroko Koyama links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	Extracellular Vesicle-Like Nanoparticles, Artificially Created by Heat Treatment of Euglena gracilis, Exhibit Autofluorescence and Suppress IL-6 Expression in RAW264.7 Cells Ayumi Sakurai,K. Egashira,Rinka Kizaki,Ika Adhani Sholihah,Hiroko Koyama,Shigeo Takashima,Yuji O. Kamatari,Irmanida Batubara,Dyah Iswantini,C. Hanny Wijaya,Ika Dewi Ana,Anggraini Barlian,Yoko Hirata,Kyoji Furuta,Hiroshi Takemori	2025	1
2	Simple methods for measuring milk exosomes using fluorescent compound GIF-2250/2276 Saho Furukawa,Kyoka Kawaguchi,Kotomi Chikama,Ryohei Yamada,Yuji O. Kamatari,Lee Wah Lim,Hiroko Koyama,Yasuo Inoshima,Mitsushi Ikemoto,Saishi Yoshida,Yoko Hirata,Kyoji Furuta,Hiroshi Takemori	2024	4
3	A novel PET probe to selectively image heat shock protein 90α/β isoforms in the brain Takayuki Sakai,Aya Ogata,Hiroshi Ikenuma,Takashi Yamada,Saori Hattori,Junichiro Abe,Shinichi Imamura,Masanori Ichise,Mari Tada,Akiyoshi Kakita,Hiroko Koyama,Masaaki Suzuki,Takashi Kato,Kengo Ito,Yasuyuki Kimura	2024	3
4	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 Hiroshi Ikenuma,Aya Ogata,Hiroko Koyama,Bin Ji,Hideki Ishii,Takashi Yamada,Junichiro Abe,Chie Seki,Yuji Nagai,Masanori Ichise,Takafumi Minamimoto,Makoto Higuchi,Ming‐Rong Zhang,Takashi Kato,Kengo Ito,Masaaki Suzuki,Yasuyuki Kimura	2023	5
5	ARL-17477 is a dual inhibitor of NOS1 and the autophagic-lysosomal system that prevents tumor growth in vitro and in vivo Teiko Komori Nomura,Satoshi Endo,Takuma Kuwano,Kazuya Fukasawa,Shigeo Takashima,Tomoki Todo,Kyoji Furuta,Takuhei Yamamoto,Eiichi Hinoi,Hiroko Koyama,Ryo Honda	2023	1
6	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 Hiroshi Ikenuma,Hiroko Koyama,Naoya Kajino,Yasuyuki Kimura,Aya Ogata,Junichiro Abe,Yasuhiro Kawasumi,Takashi Kato,Akihiko Takashima,Kengo Ito,Masaaki Suzuki	2019	5
7	Synthesis of 3-[4-(dimethylamino)phenyl]alkyl-2-oxindole derivatives and their effects on neuronal cell death Kyoji Furuta,Yu Kawai,Yosuke Mizuno,Yurika Hattori,Hiroko Koyama,Yoko Hirata	2017	16
8	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 Hiroko Koyama,Hiroshi Ikenuma,Hiroshi Toda,Goro Kondo,Masaki Hirano,Masaya Kato,Junichiro Abe,Takashi Yamada,Toshihiko Wakabayashi,Kengo Ito,Atsushi Natsume,Masaaki Suzuki	2017	5
9	Remote ischemic preconditioning protects human neural stem cells from oxidative stress Ayako Motomura,Mikiko Shimizu,Akira Kato,Kazuya Motomura,Akane Yamamichi,Hiroko Koyama,Fumiharu Ohka,Tomohide Nishikawa,Yusuke Nishimura,Masahito Hara,Tetsuya Fukuda,Yoshio Bando,Toshihide Nishimura,Toshihiko Wakabayashi,Atsushi Natsume	2017	10
10	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 Hisashi Doi,Kengo Sato,Hideo Shindou,Kengo Sumi,Hiroko Koyama,Takamitsu Hosoya,Yasuyoshi Watanabe,Satoshi Ishii,Hideo Tsukada,Koji Nakanishi,Masaaki Suzuki	2016	8
11	Toxic tau oligomer formation blocked by capping of cysteine residues with 1,2-dihydroxybenzene groups Yoshiyuki Soeda,Misato Yoshikawa,Osborne F. X. Almeida,Akio Sumioka,Sumihiro Maeda,Hiroyuki Osada,Yasumitsu Kondoh,Akiko Saito,Tomohiro Miyasaka,Tetsuya Kimura,Masaaki Suzuki,Hiroko Koyama,Yuji Yoshiike,Hachiro Sugimoto,Yasuo Ihara,Akihiko Takashima	2015	92
12	Synthesis of 11C-labeled retinoic acid, [11C]ATRA, via an alkenylboron precursor by Pd(0)-mediated rapid C-[11C]methylation Masaaki Suzuki,Misato Takashima‐Hirano,Hideki Ishii,Chika Watanabe,Kengo Sumi,Hiroko Koyama,Hisashi Doi	2014	12
13	Pd ⁰ -mediated rapid coupling of methyl iodide with excess amounts of benzyl- and cinnamylboronic acid esters: efficient method for incorporation of positron-emitting ¹¹ C radionuclide into organic frameworks by coupling between two sp ³ -hybridized carbons Hiroko Koyama,Zhouen Zhang,Ryosuke Ijuin,Siqin,Jeongwan Son,Yuma Hatta,Masashi Ohta,Masahiro Wakao,Takamitsu Hosoya,Hisashi Doi,Masaaki Suzuki	2013	11
14	Identification of a novel compound with antiviral activity against influenza A virus depending on PA subunit of viral RNA polymerase Kazunori Yamada,Hiroko Koyama,Kyoji Hagiwara,Atsushi Ueda,Yutaka Sasaki,Shin-nosuke Kanesashi,Ryuki Ueno,Hironori Nakamura,Kazuo Kuwata,Kazufumi Shimizu,Masaaki Suzuki,Yoko Aida	2012	27
15	Highly efficient syntheses of [methyl-11C]thymidine and its analogue 4′-[methyl-11C]thiothymidine as nucleoside PET probes for cancer cell proliferation by Pd0-mediated rapid C-[11C]methylation Hiroko Koyama,Siqin,Zhouen Zhang,Kengo Sumi,Yuma Hatta,Hiroko Nagata,Hisashi Doi,Masaaki Suzuki	2011	14
16	1‐Benzyl‐1,2,3,4‐tetrahydroisoquinoline binds with tubulin β, a substrate of parkin, and reduces its polyubiquitination Ryuki Kohta,Yaichiro Kotake,Takamitsu Hosoya,Toshiyuki Hiramatsu,Yuko Otsubo,Hiroko Koyama,Yuji Hirokane,Yuichi Yokoyama,Hirofumi Ikeshoji,Ken Oofusa,Masaaki Suzuki,Shigeru Ohta	2010	23
17	Pd⁰‐Mediated Rapid Coupling between Methyl Iodide and Heteroarylstannanes: An Efficient and General Method for the Incorporation of a Positron‐Emitting ¹¹C Radionuclide into Heteroaromatic Frameworks Masaaki Suzuki,Kengo Sumi,Hiroko Koyama,Siqin,Takamitsu Hosoya,Misato Takashima‐Hirano,Hisashi Doi	2009	22
18	Formation of fractal structure in many-body systems with attractive power-law potentials Hiroko Koyama,Tetsuro Konishi	2006	1
19	Emergence of power-law correlation in 1-dimensional self-gravitating system Hiroko Koyama,Tetsuro Konishi	2001	23
20	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 Nobuhiro Nakano,Norifumi Shirasaka,Hiroko Koyama,Miki Hino,Tetsuo Murakami,Sakayu Shimizu,Hajime Yoshizumi	2000	14

About Hiroko Koyama

Hiroko Koyama is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics and Statistical and Nonlinear Physics, having authored 56 papers that have together received 870 indexed citations. Recurring topics across this work include Cosmology and Gravitation Theories (9 papers), Black Holes and Theoretical Physics (9 papers), Catalytic Cross-Coupling Reactions (4 papers), Pulsars and Gravitational Waves Research (4 papers), Coordination Chemistry and Organometallics (4 papers), Quantum chaos and dynamical systems (4 papers), Glioma Diagnosis and Treatment (3 papers) and Organoboron and organosilicon chemistry (3 papers). The work is most often cited by research in Nuclear and High Energy Physics (285 citations), Astronomy and Astrophysics (334 citations) and Statistical and Nonlinear Physics (65 citations). Hiroko Koyama has collaborated with scholars based in Japan, United States and United Kingdom. Frequent 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.

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