Takashi Niiya

1.0k total citations
22 papers, 695 citations indexed

About

Takashi Niiya is a scholar working on Surgery, Hepatology and Epidemiology. According to data from OpenAlex, Takashi Niiya has authored 22 papers receiving a total of 695 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Surgery, 14 papers in Hepatology and 4 papers in Epidemiology. Recurrent topics in Takashi Niiya's work include Organ Transplantation Techniques and Outcomes (12 papers), Liver physiology and pathology (9 papers) and Liver Disease and Transplantation (5 papers). Takashi Niiya is often cited by papers focused on Organ Transplantation Techniques and Outcomes (12 papers), Liver physiology and pathology (9 papers) and Liver Disease and Transplantation (5 papers). Takashi Niiya collaborates with scholars based in Japan, Germany and China. Takashi Niiya's co-authors include Mitsuo Kusano, Takeshi Aoki, Noriyuki Murai, Yoshinori Shimizu, Hirohisa Kato, Daisuke Yasuda, Masahiko Murakami, Tomokazu Kusano, Yuta Enami and Junichi Kaneko and has published in prestigious journals such as Transplantation, World Journal of Surgery and Liver Transplantation.

In The Last Decade

Takashi Niiya

17 papers receiving 684 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Takashi Niiya Japan 10 516 474 152 107 93 22 695
Atsuo Tokuka Japan 17 407 0.8× 180 0.4× 163 1.1× 38 0.4× 91 1.0× 53 619
A. El Otmany Morocco 7 836 1.6× 209 0.4× 96 0.6× 37 0.3× 82 0.9× 15 985
U. Settmacher Germany 12 377 0.7× 193 0.4× 168 1.1× 10 0.1× 50 0.5× 26 475
A. Bunk Germany 11 163 0.3× 175 0.4× 79 0.5× 85 0.8× 103 1.1× 28 403
Keiichi Kimura Japan 14 330 0.6× 59 0.1× 253 1.7× 87 0.8× 157 1.7× 47 678
Tianfu Wen China 18 351 0.7× 529 1.1× 110 0.7× 25 0.2× 260 2.8× 40 758
Jonathan Susman United States 8 93 0.2× 125 0.3× 72 0.5× 35 0.3× 158 1.7× 17 391
Cherif Boutros United States 11 256 0.5× 90 0.2× 126 0.8× 78 0.7× 58 0.6× 31 574
Jinshan Zhang China 12 179 0.3× 99 0.2× 66 0.4× 26 0.2× 77 0.8× 59 436
D. Sahani United States 10 266 0.5× 69 0.1× 146 1.0× 26 0.2× 115 1.2× 21 481

Countries citing papers authored by Takashi Niiya

Since Specialization
Citations

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

Fields of papers citing papers by Takashi Niiya

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Takashi Niiya

This figure shows the co-authorship network connecting the top 25 collaborators of Takashi Niiya. A scholar is included among the top collaborators of Takashi Niiya 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 Takashi Niiya. Takashi Niiya 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.
Shimizu, Yoshinori, Takeshi Aoki, Tomokazu Kusano, et al.. (2009). Natural course of the remnant hepatic functional reserve as estimated by technetium-99m-galactosyl human serum albumin scintigraphy after a hepatectomy. Journal of Gastroenterology. 45(3). 308–316. 3 indexed citations
2.
Odaira, Masanori, Takeshi Aoki, Rika Yasuhara, et al.. (2008). Cold Preservation of the Liver With Oxygenation by a Two-Layer Method. Journal of Surgical Research. 152(2). 209–217.
3.
Hayashi, Ken, Takeshi Aoki, Nobukazu Nishino, et al.. (2007). Hepatocyte Transplantation from Steatotic Liver in a Rat Model. Journal of Surgical Research. 142(1). 104–112. 3 indexed citations
4.
Koizumi, Tomotake, Takeshi Aoki, Yasuna Kobayashi, et al.. (2007). Long-Term Maintenance of the Drug Transport Activity in Cryopreservation of Microencapsulated Rat Hepatocytes. Cell Transplantation. 16(1). 67–73. 9 indexed citations
5.
Akamatsu, Nobuhisa, Yasuhiko Sugawara, Jun Nakajima, et al.. (2005). Resection of a Pulmonary Lesion After Liver Transplantation: Report of a Case. Surgery Today. 35(11). 976–978. 3 indexed citations
6.
Aoki, Takeshi, Nobukazu Nishino, Hirohisa Kato, et al.. (2005). Intrasplenic Transplantation of Encapsulated Hepatocytes Decreases Mortality and Improves Liver Functions in Fulminant Hepatic Failure from 90% Partial Hepatectomy in Rats. Transplantation. 79(7). 783–790. 36 indexed citations
7.
Aoki, Takeshi, Tomotake Koizumi, Yasuna Kobayashi, et al.. (2005). A Novel Method of Cryopreservation of Rat and Human Hepatocytes by Using Encapsulation Technique and Possible Use for Cell Transplantation. Cell Transplantation. 14(9). 609–620. 38 indexed citations
8.
Akamatsu, Nobuhisa, Yasuhiko Sugawara, Junichi Kaneko, et al.. (2004). SURGICAL REPAIR FOR LATE-ONSET HEPATIC VENOUS OUTFLOW BLOCK AFTER LIVING-DONOR LIVER TRANSPLANTATION. Transplantation. 77(11). 1768–1770. 23 indexed citations
9.
Sugawara, Yasuhiko, Masatoshi Makuuchi, Nobuhisa Akamatsu, et al.. (2004). Refinement of venous reconstruction using cryopreserved veins in right liver grafts. Liver Transplantation. 10(4). 541–547. 105 indexed citations
10.
Hata, Shojiro, Yasuhiko Sugawara, Yoji Kishi, et al.. (2004). Volume regeneration after right liver donation. Liver Transplantation. 10(1). 65–70. 49 indexed citations
11.
Mitamura, Keitaro, Koji Otsuka, Hirohisa Kato, et al.. (2003). Detection of Nitric Oxide Generation by Electron Spin Resonance Spectroscopy after Partial Hepatectomy. The Showa University Journal of Medical Sciences. 15(3). 237–244. 1 indexed citations
12.
Kong, Dalu, Mitsuo Kusano, Nobukazu Nishino, et al.. (2002). Liver regeneration after portal vein plus hepatic artery ligation performed heterochronously in rats. Journal of Hepato-Biliary-Pancreatic Surgery. 9(1). 86–92. 9 indexed citations
13.
Enami, Yuta, Hirohisa Kato, Masahiko Murakami, et al.. (2001). Anti-transforming growth factor-β1 antibody transiently enhances DNA synthesis during liver regeneration after partial hepatectomy in rats. Journal of Hepato-Biliary-Pancreatic Surgery. 8(3). 250–258. 17 indexed citations
14.
Kusano, Mitsuo, Toshihiro Fujioka, Takashi Niiya, et al.. (2001). Microwave coagulation therapy for liver cancer using a water-cooled electrode. Journal of Microwave Surgery. 19. 17–20. 1 indexed citations
15.
Murakami, Masahiko, et al.. (2000). A Case of Multiple Gastric Carcinoids.. The Japanese Journal of Gastroenterological Surgery. 33(8). 1493–1497. 1 indexed citations
16.
Ishii, Hiroshi, et al.. (2000). A CASE OF CARBOHYDRATE ANTIGEN 19-9 PRODUCTING GASTRIC MUTINOUS ADENOCARCINOMA WITH TOO MUCH MUCOUS SECRETING. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 61(4). 958–962. 1 indexed citations
17.
Niiya, Takashi, et al.. (1999). A CASE OF SECONDARY SMALL BOWEL VOLVULUS DUE TO FEMORAL HERNIA. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 60(2). 444–446. 1 indexed citations
18.
Murai, Noriyuki, Masahiko Murakami, Takeshi Aoki, et al.. (1999). Evaluation of Postoperative Morbidity in Video-Assisted Thoracoscopic Surgery for Esophagectomy (VATS-E). The Showa University Journal of Medical Sciences. 11(2). 133–140. 1 indexed citations
19.
Niiya, Takashi, Masahiko Murakami, Takeshi Aoki, et al.. (1999). Immediate increase of portal pressure, reflecting sinusoidal shear stress, induced liver regeneration after partial hepatectomy. Journal of Hepato-Biliary-Pancreatic Surgery. 6(3). 275–280. 77 indexed citations
20.
Niiya, Takashi, et al.. (1996). A Case of Papipillary Carcinoma of the Cystic Duct Founded in Four Years After Laparoscopic Cholecystectomy. 49(0). 234–235. 1 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

Breakdown of academic impact, for papers by Atsuo Tokuka Breakdown of academic impact, for papers by A. El Otmany Breakdown of academic impact, for papers by U. Settmacher Breakdown of academic impact, for papers by A. Bunk Breakdown of academic impact, for papers by Keiichi Kimura Breakdown of academic impact, for papers by Tianfu Wen Breakdown of academic impact, for papers by Jonathan Susman Breakdown of academic impact, for papers by Cherif Boutros Breakdown of academic impact, for papers by Jinshan Zhang Breakdown of academic impact, for papers by D. Sahani
Rankless by CCL
2026