Junko Koyama

2.1k total citations
73 papers, 1.7k citations indexed

About

Junko Koyama is a scholar working on Organic Chemistry, Toxicology and Plant Science. According to data from OpenAlex, Junko Koyama has authored 73 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 30 papers in Organic Chemistry, 21 papers in Toxicology and 17 papers in Plant Science. Recurrent topics in Junko Koyama's work include Bioactive Compounds and Antitumor Agents (21 papers), Phytochemistry and biological activity of medicinal plants (14 papers) and Synthesis and Reactions of Organic Compounds (11 papers). Junko Koyama is often cited by papers focused on Bioactive Compounds and Antitumor Agents (21 papers), Phytochemistry and biological activity of medicinal plants (14 papers) and Synthesis and Reactions of Organic Compounds (11 papers). Junko Koyama collaborates with scholars based in Japan, United States and Nigeria. Junko Koyama's co-authors include Kiyoshi Tagahara, Izumi Morita, Toshiyuki Osakai, Norihiro Kobayashi, Hiroki Hotta, Yoshio Tsujino, Masashi Ueda, Kei‐Ichi Hirai, Harukuni Tokuda and Hoyoku Nishino and has published in prestigious journals such as Analytical Biochemistry, Antimicrobial Agents and Chemotherapy and Journal of Chromatography A.

In The Last Decade

Junko Koyama

71 papers receiving 1.7k citations

Peers

Countries citing papers authored by Junko Koyama

Since Specialization

Citations

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

Fields of papers citing papers by Junko Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Junko Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Junko Koyama. A scholar is included among the top collaborators of Junko 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 Junko Koyama. Junko Koyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Simultaneous determination of histamine and prostaglandin D2 using an LC-ESI-MS/MS method with positive/negative ion-switching ionization modes: application to the study of anti-allergic flavonoids on the degranulation of KU812 cells 2011 ·Analytical and Bioanalytical Chemistry ·Junko Koyama, (unknown), (unknown), M. Shimizu, Izumi Morita, Atsuko Takeuchi	16
2	Biotransformation of Phenolic Tetrahydroprotoberberines in Plant Cell Cultures Followed by LC-NMR, LC-MS, and LC-CD 2010 ·Journal of Natural Products ·Kinuko Iwasa, (unknown), (unknown), Yumi Nishiyama, M. Kamigauchi, Junko Koyama, Atsuko Takeuchi, Masataka Moriyasu, Kazuyoshi Takeda	12
3	Characterization of emodin metabolites in Raji cells by LC–APCI-MS/MS 2009 ·Bioorganic & Medicinal Chemistry ·Junko Koyama, Atsuko Takeuchi, Izumi Morita, (unknown), M. Shimizu, (unknown), Norihiro Kobayashi	12
4	Development of an LC-ESI–MS/MS method for the determination of histamine: Application to the quantitative measurement of histamine degranulation by KU812 cells 2008 ·Journal of Chromatography B ·Junko Koyama, Atsuko Takeuchi, Chisato Tode, M. Shimizu, Izumi Morita, (unknown), (unknown), Norihiro Kobayashi	11
5	Simultaneous determination of anthraquinones in rhubarb by high-performance liquid chromatography and capillary electrophoresis 2007 ·Journal of Chromatography A ·Junko Koyama, Izumi Morita, Norihiro Kobayashi	80
6	Furanonaphthoquinones cause apoptosis of cancer cells by inducing the production of reactive oxygen species by the mitochondrial voltage-dependent anion channel 2006 ·Cancer Biology & Therapy ·Eriko Simamura, Kei‐Ichi Hirai, (unknown), Junko Koyama, Yukie Niwa, Shigeomi Shimizu	68
7	Correlation between reduction potentials and inhibitory effects on Epstein–Barr virus activation of poly-substituted anthraquinones 2004 ·Cancer Letters ·Junko Koyama, Izumi Morita, Norihiro Kobayashi, Toshiyuki Osakai, Hoyoku Nishino, Harukuni Tokuda	11
8	Correlation of redox potentials and inhibitory effects on Epstein-Barr virus activation of 2-azaanthraquinones 2004 ·Cancer Letters ·Junko Koyama, Izumi Morita, Norihiro Kobayashi, Toshiyuki Osakai, Hiroki Hotta, Junko Takayasu, Hoyoku Nishino, Harukuni Tokuda	18
9	Mitochondrial damage prior to apoptosis in furanonaphthoquinone treated lung cancer cells 2003 ·Cancer Detection and Prevention ·Eriko Simamura, Kei‐Ichi Hirai, Hiroki Shimada, Jiehong Pan, Junko Koyama	14
10	Correlation of redox potentials and inhibitory effects on Epstein–Barr virus activation of naphthoquinones 2003 ·Cancer Letters ·Junko Koyama, Izumi Morita, Norihiro Kobayashi, Toshiyuki Osakai, Hiroki Hotta, Junko Takayasu, Hoyoku Nishino, Harukuni Tokuda	25
11	Alpha-Tocopherol Protects Cultured Human Cells from the Acute Lethal Cytotoxicity of Dioxin 2002 ·International Journal for Vitamin and Nutrition Research ·Kei‐Ichi Hirai, Jiehong Pan, Ying‐Bo Shui, Eriko Simamura, (unknown), (unknown), Junko Koyama	12
12	Mechanistic Study of the Oxidation of Caffeic Acid by Digital Simulation of Cyclic Voltammograms 2002 ·Analytical Biochemistry ·Hiroki Hotta, Masashi Ueda, (unknown), Yoshio Tsujino, Junko Koyama, Toshiyuki Osakai	94
13	Chemopreventive effects of emodin and cassiamin B in mouse skin carcinogenesis 2002 ·Cancer Letters ·Junko Koyama, Izumi Morita, Kiyoshi Tagahara, Yoshitaka Nobukuni, Teruo Mukainaka, Masashi Kuchide, Harukuni Tokuda, Hoyoku Nishino	40
14	Higher radical scavenging activities of polyphenolic antioxidants can be ascribed to chemical reactions following their oxidation 2002 ·Biochimica et Biophysica Acta (BBA) - General Subjects ·Hiroki Hotta, (unknown), Masashi Ueda, Yoshio Tsujino, Junko Koyama, Toshiyuki Osakai	238
15	Micellar Electrokinetic Chromatography (MEKC) Separation of Furanonaphthoquinones from Tabebuia impetiginosa. 2000 ·Chemical and Pharmaceutical Bulletin ·Junko Koyama, Izumi Morita, (unknown), Kiyoshi Tagahara	7
16	Inhibitory effect of furanonaphthoquinone derivatives on the replication of Japanese encephalitis virus 1998 ·Antiviral Research ·Tsutomu Takegami, Eriko Simamura, Kei‐Ichi Hirai, Junko Koyama	31
17	Antitumor agents—CLXVII. Synthesis and structure-activity correlations of the cytotoxic anthraquinone 1,4-bis-(2,3-epoxypropylamino)-9,10-anthracenedione, and of related compounds 1997 ·Bioorganic & Medicinal Chemistry ·(unknown), Hiroshi Kiyokawa, Shohei Tani, Junko Koyama, Susan L. Morris‐Natschke, Anthony B. Mauger, (unknown), (unknown), Kuo‐Hsiung Lee	27
18	Anti-tumor promoting effects of naphthoquinone derivatives on short term Epstein-Barr early antigen activation assay and in mouse skin carcinogenesis 1997 ·Cancer Letters ·Govind J. Kapadia, V. Balasubramanian, Harukuni Tokuda, Takao Konoshima, Midori Takasaki, Junko Koyama, (unknown), Hoyoku Nishino	56
19	Studies on Inhibitors of Skin Tumor Promotion, VI. Inhibitory Effects of Quinones on Epsterin-Barr Virus Activation 1989 ·Journal of Natural Products ·Takao Konoshima, (unknown), Junko Koyama, (unknown), Harukuni Tokuda	56
20	Synthesis of Alkaloids, Tortuosamine, N-Formyltortuosamine, and Related Compound 1981 ·Heterocycles ·Hiroshi Irie, Junko Koyama, (unknown), (unknown)	7

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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