MASAHISA OKA

880 total citations
26 papers, 731 citations indexed

About

MASAHISA OKA is a scholar working on Pharmacology, Organic Chemistry and Molecular Biology. According to data from OpenAlex, MASAHISA OKA has authored 26 papers receiving a total of 731 indexed citations (citations by other indexed papers that have themselves been cited), including 13 papers in Pharmacology, 12 papers in Organic Chemistry and 11 papers in Molecular Biology. Recurrent topics in MASAHISA OKA's work include Microbial Natural Products and Biosynthesis (9 papers), Cancer therapeutics and mechanisms (5 papers) and Fungal Biology and Applications (5 papers). MASAHISA OKA is often cited by papers focused on Microbial Natural Products and Biosynthesis (9 papers), Cancer therapeutics and mechanisms (5 papers) and Fungal Biology and Applications (5 papers). MASAHISA OKA collaborates with scholars based in Japan, Germany and United Kingdom. MASAHISA OKA's co-authors include TOSHIKAZU OKI, MASATAKA KONISHI, Hideo Kamei, Hiroshi Kawaguchi, Kentoku Gotanda, Masato Matsugi, Takeo Miyaki, Yasuyuki Kita, Takahiro Yamaguchi and Koji Tomita and has published in prestigious journals such as The Journal of Organic Chemistry, Tetrahedron and Tetrahedron Letters.

In The Last Decade

MASAHISA OKA

25 papers receiving 690 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
MASAHISA OKA Japan 16 362 296 292 102 61 26 731
Mutsuo Nakajima Japan 15 438 1.2× 440 1.5× 277 0.9× 103 1.0× 98 1.6× 35 894
NOBUAKI NARUSE Japan 17 260 0.7× 398 1.3× 301 1.0× 148 1.5× 52 0.9× 24 723
YASUO FUKAGAWA United Kingdom 16 357 1.0× 449 1.5× 432 1.5× 100 1.0× 61 1.0× 71 862
Sebastian Hernandez United States 9 390 1.1× 443 1.5× 533 1.8× 60 0.6× 69 1.1× 14 1.2k
Takaaki Nishikiori Japan 14 176 0.5× 326 1.1× 228 0.8× 123 1.2× 104 1.7× 26 662
Kazuyuki Dobashi Japan 14 206 0.6× 339 1.1× 218 0.7× 105 1.0× 76 1.2× 35 580
Toshio Takatsu Japan 17 256 0.7× 448 1.5× 327 1.1× 83 0.8× 68 1.1× 44 731
MARIANNA JACKSON United Kingdom 17 370 1.0× 584 2.0× 591 2.0× 153 1.5× 100 1.6× 34 1.0k
J. Philip Poyser United Kingdom 12 194 0.5× 258 0.9× 156 0.5× 87 0.9× 65 1.1× 22 522
Kei-Ichi Numata Japan 15 300 0.8× 442 1.5× 195 0.7× 60 0.6× 81 1.3× 31 740

Countries citing papers authored by MASAHISA OKA

Since Specialization
Citations

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

Fields of papers citing papers by MASAHISA OKA

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of MASAHISA OKA

This figure shows the co-authorship network connecting the top 25 collaborators of MASAHISA OKA. A scholar is included among the top collaborators of MASAHISA OKA 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 MASAHISA OKA. MASAHISA OKA 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.
Kita, K, MASAHISA OKA, & Hirofumi Yokota. (2003). Dietary Fatty Acid Increases Body Weight Gain without a Change in Rumen Fermentation in Fattening Cattle. Asian-Australasian Journal of Animal Sciences. 16(1). 39–43. 6 indexed citations
2.
Kita, Yasuyuki, Kentoku Gotanda, Kenji Murata, et al.. (1998). Practical Radical Additions under Mild Conditions Using 2,2‘-Azobis(2,4-dimethyl-4-methoxyvaleronitrile) [V-70] as an Initiator. Organic Process Research & Development. 2(4). 250–254. 44 indexed citations
3.
4.
OKA, MASAHISA, Yukio Narita, MASATAKA KONISHI, et al.. (1993). Terpestacin, a novel syncytium formation inhibitor, isolated from Arthrinium species. Tetrahedron Letters. 34(3). 493–496. 35 indexed citations
5.
NARUSE, NOBUAKI, MASAHISA OKA, MASATAKA KONISHI, & TOSHIKAZU OKI. (1993). New antiviral antibiotics, Kistamicins A and B. II. Structure determination.. The Journal of Antibiotics. 46(12). 1812–1818. 35 indexed citations
6.
OKA, MASAHISA, Yukio Narita, TAMOTSU FURUMAI, et al.. (1993). Stereochemistry and biosynthesis of terpestacin, a new syncytium formation inhibitor. The Journal of Organic Chemistry. 58(7). 1875–1881. 30 indexed citations
7.
Ueki, Tomokazu, MASAHISA OKA, YASUO FUKAGAWA, & TOSHIKAZU OKI. (1993). Studies on the mode of antifungal action of pradimicin antibiotics. III. Spectrophotometric sequence analysis of the ternary complex formation of BMY-28864 with D-mannopyranoside and calcium.. The Journal of Antibiotics. 46(3). 465–477. 38 indexed citations
8.
TODA, SOICHIRO, Satoshi Yamamoto, Osamu Tenmyo, et al.. (1993). A new neuritogenetic compound BU-4514N produced.. The Journal of Antibiotics. 46(6). 875–883. 15 indexed citations
9.
OKA, MASAHISA, Osamu Tenmyo, YOSUKE SAWADA, et al.. (1993). Terpestacin, a new syncytium formation inhibitor from Arthrinium sp.. The Journal of Antibiotics. 46(3). 367–373. 65 indexed citations
10.
OKA, MASAHISA, MITSUAKI TSUNAKAWA, Koji Tomita, et al.. (1991). Melanostatin, a new melanin synthesis inhibitor. Production, isolation, chemical properties, structure and biological activity.. The Journal of Antibiotics. 44(1). 25–32. 47 indexed citations
11.
Kamachi, Hajime, MASAHISA OKA, Yukio Narita, et al.. (1990). Synthesis of a new series of cephalosporins having 3-substituted-ammonio-1-propenyl group as the C-3 side chain.. The Journal of Antibiotics. 43(5). 533–543. 10 indexed citations
12.
Kamei, Hideo, et al.. (1990). Piperafizines A and B potentiators of cytotoxicity of vincristine.. The Journal of Antibiotics. 43(8). 1018–1020. 23 indexed citations
13.
OKA, MASAHISA, Hideo Kamei, Yasutaro Hamagishi, et al.. (1990). Chemical and biological properties of rubiginone, a complex of new antibiotics with vincristine-cytotoxicity potentiating activity.. The Journal of Antibiotics. 43(8). 967–976. 43 indexed citations
14.
OKA, MASAHISA, MASATAKA KONISHI, TOSHIKAZU OKI, & Mamoru Ohashi. (1990). Absolute configuration of the rubiginones and photo-induced oxidation of the C1 hydroxyl of the antibiotics to a ketone. Tetrahedron Letters. 31(51). 7473–7474. 12 indexed citations
15.
OKA, MASAHISA, Yuji Nishiyama, Shinichi Ohta, et al.. (1988). Glidobactins A, B and C, new antitumor antibiotics. I. Production, isolation, chemical properties and biological activity.. The Journal of Antibiotics. 41(10). 1331–1337. 77 indexed citations
16.
OKA, MASAHISA, Kei-Ichi Numata, Yuji Nishiyama, et al.. (1988). Chemical modification of the antitumor antibiotic glidobactin.. The Journal of Antibiotics. 41(12). 1812–1822. 22 indexed citations
17.
OKA, MASAHISA, HIROAKI OHKUMA, Hideo Kamei, et al.. (1988). Glidobactins D, E, F, G and H; Minor components of the antitumor antibiotic glidobactin.. The Journal of Antibiotics. 41(12). 1906–1909. 27 indexed citations
18.
Numata, Kei-Ichi, MASAHISA OKA, Yasukazu Nakakita, et al.. (1988). Enzymatic formation of glidobactamine: A peptide nucleus of glidobactins A, B and C, new lipopeptide antitumor antibiotics.. The Journal of Antibiotics. 41(10). 1351–1357. 11 indexed citations
19.
Numata, Kei-Ichi, Tsutomu Murakami, MASAHISA OKA, et al.. (1988). Enhanced production of the minor components of glidobactins in Polyangium brachysporum.. The Journal of Antibiotics. 41(10). 1358–1365. 10 indexed citations
20.
OKA, MASAHISA, et al.. (1988). Glidobactins A, B and C, new antitumor antibiotics. II. Structure elucidation.. The Journal of Antibiotics. 41(10). 1338–1350. 52 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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