This map shows the geographic impact of Toru Okuyama'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 Toru Okuyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Toru Okuyama more than expected).
This network shows the impact of papers produced by Toru Okuyama. 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 Toru Okuyama. The network helps show where Toru Okuyama may publish in the future.
Co-authorship network of co-authors of Toru Okuyama
This figure shows the co-authorship network connecting the top 25 collaborators of Toru Okuyama.
A scholar is included among the top collaborators of Toru Okuyama 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 Toru Okuyama. Toru Okuyama is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Tosun, Alev, et al.. (2005). Pyranocoumarins from Seseli gummiferum subsp. corymbosum Growing in Turkey. DergiPark (Istanbul University).22 indexed citations
6.
Li, Shuai, et al.. (2004). Chemical constituents of Bidens bipinnata (II). Zhongcaoyao. 35(9). 972–975.6 indexed citations
7.
Shibano, Makio, Masahiko Taniguchi, Genjiro Kusano, et al.. (2004). Three New Saponins as Index Compounds of Glycyrrhiza flavescens BOISS. Growing in Turkey. Natural medicines = 生薬學雜誌. 58(4). 150–155.1 indexed citations
8.
Tosun, Alev, et al.. (2003). Coumarins from Seseli gummiferum Pall, ex Sin. subsp. corymbosum P. H. Davis. Natural medicines = 生薬學雜誌. 57(3). 117.3 indexed citations
9.
Kusano, Genjiro, Makio Shibano, Kunio Takahashi, et al.. (2002). Studies on Index Compounds for HPLC Analysis of Glycyrrhiza flavescens Growing in Turkey. 56(4). 129–135.2 indexed citations
10.
Okada, Yoshihito, et al.. (1999). Naturally Occurring Substances for Prevention of Complications of Diabetes. IV : Screening of Seavegetables for Inhibitory Effect on Aldose Reductase.. Natural medicines = 生薬學雜誌. 53(3). 138–140.5 indexed citations
11.
Singab, Abdel Nasser B., Taha I. Khalifa, G. H. Mahran, et al.. (1998). A New Flavonoid Glycoside from Pituranthos tortuosus Desf, Benth & Hook. Natural medicines = 生薬學雜誌. 52(2). 191–194.4 indexed citations
12.
Kuang, Haixue, et al.. (1997). Studies on the Constituents of Astragalus membranaceus II. : Structure of Triterpenoidal Glycoside, Huangqiyenin D, from its Leaves. 51(4). 358–360.3 indexed citations
13.
Takatsuki, Satoshi, et al.. (1996). Studies on Cytotoxic Activity of Animal and Plant Crude Drugs. 50(2). 145–157.5 indexed citations
14.
Narui, Takao, et al.. (1996). Anti-Blood Coagulation and Cytotoxic Effects of Compounds from Chinese Plants Used for Thrombosis-Like Diseases. 50(5). 358–362.6 indexed citations
15.
Okuyama, Toru, et al.. (1995). Studies on the Cancer Chemoprevention of Natural Resources. XI : Anti-Tumor Promoting Activities of Crude Drug "Xiebai" and Kampo Prescriptions COmposed of "Xiebai". 49(3). 261–265.2 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.