Katsuhiko Ohnuma

578 total citations
24 papers, 464 citations indexed

About

Katsuhiko Ohnuma is a scholar working on Public Health, Environmental and Occupational Health, Genetics and Molecular Biology. According to data from OpenAlex, Katsuhiko Ohnuma has authored 24 papers receiving a total of 464 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Public Health, Environmental and Occupational Health, 11 papers in Genetics and 10 papers in Molecular Biology. Recurrent topics in Katsuhiko Ohnuma's work include Reproductive Biology and Fertility (16 papers), Sperm and Testicular Function (10 papers) and Reproductive Physiology in Livestock (6 papers). Katsuhiko Ohnuma is often cited by papers focused on Reproductive Biology and Fertility (16 papers), Sperm and Testicular Function (10 papers) and Reproductive Physiology in Livestock (6 papers). Katsuhiko Ohnuma collaborates with scholars based in Japan, Indonesia and Hungary. Katsuhiko Ohnuma's co-authors include Junko Noguchi, Hiroyuki Kaneko, Kazuhiro Kikuchi, Manabu Ozawa, Takashi Nagai, N. Maedomari, Ni Wayan Kurniani Karja, Mokhamad Fahrudin, Naomi Kashiwazaki and Michiko Nakai and has published in prestigious journals such as Reproduction, Theriogenology and Animal Reproduction Science.

In The Last Decade

Katsuhiko Ohnuma

24 papers receiving 454 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Katsuhiko Ohnuma Japan	13	368	222	189	108	72	24	464
A. Kidson Netherlands	7	273 0.7×	161 0.7×	136 0.7×	79 0.7×	66 0.9×	11	346
José Luiz Rodrigues Brazil	13	408 1.1×	257 1.2×	169 0.9×	110 1.0×	60 0.8×	55	485
Y. Monji Japan	14	434 1.2×	233 1.0×	149 0.8×	88 0.8×	135 1.9×	33	571
Françoise Berthelot France	9	406 1.1×	254 1.1×	169 0.9×	124 1.1×	59 0.8×	11	470
Thanh Quang Dang‐Nguyen Japan	14	435 1.2×	272 1.2×	246 1.3×	110 1.0×	34 0.5×	45	574
Milan Tománek Czechia	8	323 0.9×	199 0.9×	159 0.8×	58 0.5×	44 0.6×	9	415
Szilárd Bodó Hungary	8	214 0.6×	114 0.5×	240 1.3×	91 0.8×	33 0.5×	20	421
Pimprapar Wongsrikeao Japan	16	517 1.4×	344 1.5×	270 1.4×	125 1.2×	41 0.6×	28	660
R. Marchal France	7	438 1.2×	287 1.3×	177 0.9×	119 1.1×	65 0.9×	8	497
Alicia Nohalez Spain	12	260 0.7×	117 0.5×	128 0.7×	82 0.8×	61 0.8×	20	309

Countries citing papers authored by Katsuhiko Ohnuma

Since Specialization

Citations

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

Fields of papers citing papers by Katsuhiko Ohnuma

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Katsuhiko Ohnuma

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Fahrudin, Mokhamad, Kazuhiro Kikuchi, Ni Wayan Kurniani Karja, et al.. (2007). Development to the Blastocyst Stage of Porcine Somatic Cell Nuclear Transfer Embryos Reconstructed by the Fusion of Cumulus Cells and Cytoplasts Prepared by Gradient Centrifugation. Cloning and Stem Cells. 9(2). 216–228. 10 indexed citations

Maedomari, N., Kazuhiro Kikuchi, Manabu Ozawa, et al.. (2007). Cytoplasmic glutathione regulated by cumulus cells during porcine oocyte maturation affects fertilization and embryonic development in vitro. Theriogenology. 67(5). 983–993. 98 indexed citations

Ozawa, Manabu, Takashi Nagai, T. Somfai, et al.. (2007). Comparison between effects of 3‐isobutyl‐1‐methylxanthine and FSH on gap junctional communication, LH‐receptor expression, and meiotic maturation of cumulus–oocyte complexes in pigs. Molecular Reproduction and Development. 75(5). 857–866. 29 indexed citations

Ohnuma, Katsuhiko, Hiroyuki Kaneko, Junko Noguchi, et al.. (2006). Production of inhibin A and inhibin B in boars: Changes in testicular and circulating levels of dimeric inhibins and characterization of inhibin forms during testis growth. Domestic Animal Endocrinology. 33(4). 410–421. 26 indexed citations

Somfai, T., Manabu Ozawa, Junko Noguchi, et al.. (2006). 133 VITRIFICATION CAUSES DAMAGE OF THE ANTIOXIDANT DEFENSE SYSTEM IN IVM PORCINE OOCYTES. Reproduction Fertility and Development. 19(1). 184–184. 4 indexed citations

Kaneko, Hiroyuki, Kazuhiro Kikuchi, Junko Noguchi, et al.. (2006). Effects of gonadotrophin treatments on meiotic and developmental competence of oocytes in porcine primordial follicles following xenografting to nude mice. Reproduction. 131(2). 279–288. 23 indexed citations

Karja, Ni Wayan Kurniani, Kazuhiro Kikuchi, Mokhamad Fahrudin, et al.. (2006). Development to the blastocyst stage, the oxidative state, and the quality of early developmental stage of porcine embryos cultured in alteration of glucose concentrations in vitro under different oxygen tensions. Reproductive Biology and Endocrinology. 4(1). 54–54. 41 indexed citations

Kikuchi, Kazuhiro, Hiroyuki Kaneko, Michiko Nakai, et al.. (2006). In Vitro and In Vivo Developmental Ability of Oocytes Derived from Porcine Primordial Follicles Xenografted into Nude Mice. Journal of Reproduction and Development. 52(1). 51–57. 13 indexed citations

Ozawa, Manabu, Takashi Nagai, Mokhamad Fahrudin, et al.. (2006). Addition of glutathione or thioredoxin to culture medium reduces intracellular redox status of porcine IVM/IVF embryos, resulting in improved development to the blastocyst stage. Molecular Reproduction and Development. 73(8). 998–1007. 55 indexed citations

10.

Somfai, T., Manabu Ozawa, Junko Noguchi, et al.. (2006). Diploid porcine parthenotes produced by inhibition of first polar body extrusion during in vitro maturation of follicular oocytes. Reproduction. 132(4). 559–570. 19 indexed citations

11.

Kaneko, Hiroyuki, Masatoshi Matsuzaki, Junko Noguchi, et al.. (2006). Changes in Circulating and Testicular Levels of Inhibin A and B During Postnatal Development in Bulls. Journal of Reproduction and Development. 52(6). 741–749. 12 indexed citations

12.

Somfai, T., Kazuhiro Kikuchi, Sergey Medvedev, et al.. (2005). Development to the blastocyst stage of immature pig oocytes arrested before the metaphase-II stage and fertilized in vitro. Animal Reproduction Science. 90(3-4). 307–328. 28 indexed citations

13.

Suzuki, Misae, Manabu Ozawa, Junko Noguchi, et al.. (2005). Successful piglet production by IVF of oocytes matured in vitro using NCSU-37 supplemented with fetal bovine serum. Theriogenology. 65(2). 374–386. 26 indexed citations

14.

Ozawa, Manabu, Takashi Nagai, Hiroyuki Kaneko, et al.. (2005). Successful pig embryonic development in vitro outside a CO2 gas-regulated incubator: Effects of pH and osmolality. Theriogenology. 65(4). 860–869. 13 indexed citations

15.

Ohnuma, Katsuhiko, K. Ito, Jutaro Takahashi, Yasuo NAMBO, & Yoh-Ichi MIYAKE. (2004). Partial Purification of Mare Early Pregnancy Factor. American Journal of Reproductive Immunology. 51(2). 95–101. 3 indexed citations

16.

Todoroki, Junichi, Junko Noguchi, Kazuhiro Kikuchi, et al.. (2004). Plasma concentrations of inhibin A in cattle with follicular cysts: relationships with turnover of follicular waves and plasma levels of gonadotropins and steroid hormones. Domestic Animal Endocrinology. 27(4). 333–344. 8 indexed citations

17.

Ohnuma, Katsuhiko, et al.. (2003). Purification of mouse primordial germ cells by Nycodenz. Reproduction. 125(5). 667–675. 9 indexed citations

18.

Ohnuma, Katsuhiko, Masaki Yokoo, K. Ito, et al.. (2000). Study of Early Pregnancy Factor (EPF) in Equine (Equus caballus). American Journal of Reproductive Immunology. 43(3). 174–179. 12 indexed citations

19.

Takagi, Mitsuhiro, Kenichi Nishimura, N. Oguri, et al.. (1998). Measurement of early pregnancy factor activity for monitoring the viability of the equine embryo. Theriogenology. 50(2). 255–262. 10 indexed citations

20.

Ohnuma, Katsuhiko, et al.. (1996). Detection of Early Pregnancy Factor (EPF) in Mare Sera.. Journal of Reproduction and Development. 42(1). 23–28. 13 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.

Explore authors with similar magnitude of impact