Hiroyuki Koyama

16.0k total citations · 1 hit paper
337 papers, 12.8k citations indexed

About

Hiroyuki Koyama is a scholar working on Plant Science, Molecular Biology and Genetics. According to data from OpenAlex, Hiroyuki Koyama has authored 337 papers receiving a total of 12.8k indexed citations (citations by other indexed papers that have themselves been cited), including 120 papers in Plant Science, 77 papers in Molecular Biology and 47 papers in Genetics. Recurrent topics in Hiroyuki Koyama's work include Aluminum toxicity and tolerance in plants and animals (84 papers), Plant Stress Responses and Tolerance (78 papers) and Plant Micronutrient Interactions and Effects (49 papers). Hiroyuki Koyama is often cited by papers focused on Aluminum toxicity and tolerance in plants and animals (84 papers), Plant Stress Responses and Tolerance (78 papers) and Plant Micronutrient Interactions and Effects (49 papers). Hiroyuki Koyama collaborates with scholars based in Japan, India and United States. Hiroyuki Koyama's co-authors include Kazunori Kataoka, Nobuhiro Nishiyama, Yuriko Kobayashi, Tsutomu Hohdatsu, Kanjiro Miyata, Tetsuo Hara, Makoto Oba, Shigeto Fukushima, Yuichi Yamasaki and Satoshi Iuchi and has published in prestigious journals such as Proceedings of the National Academy of Sciences, Journal of the American Chemical Society and Nucleic Acids Research.

In The Last Decade

Hiroyuki Koyama

326 papers receiving 12.5k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Preparation and Biological Characterization of Polymeric Micelle Drug Carriers with Intracellular pH-Triggered Drug Release Property: Tumor Permeability, Controlled Subcellular Drug Distribution, and Enhanced in Vivo Antitumor Efficacy

2004 603 citations Hiroyuki Koyama et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Hiroyuki Koyama Japan	56	4.7k	3.8k	2.4k	1.5k	1.4k	337	12.8k
Edward A. Bayer Israel	81	5.5k 1.2×	12.4k 3.3×	3.2k 1.4×	12.1k 8.1×	1.1k 0.8×	412	25.6k
Shin‐Ichiro Nishimura Japan	62	927 0.2×	8.7k 2.3×	2.4k 1.0×	1.3k 0.9×	447 0.3×	451	16.8k
Kjell M. Vårum Norway	55	1.4k 0.3×	4.1k 1.1×	3.8k 1.6×	1.3k 0.9×	348 0.3×	99	9.7k
Li Tang China	48	542 0.1×	3.6k 0.9×	1.9k 0.8×	2.4k 1.6×	302 0.2×	187	8.8k
Haiyan Liu China	45	708 0.1×	3.9k 1.0×	1.6k 0.7×	1.2k 0.8×	403 0.3×	348	9.6k
Yan Deng China	47	734 0.2×	4.6k 1.2×	849 0.4×	2.8k 1.9×	411 0.3×	386	10.2k
Tomáš Ruml Czechia	45	584 0.1×	2.4k 0.6×	1.2k 0.5×	2.0k 1.4×	326 0.2×	246	8.1k
Nobuhiko Nomura Japan	55	772 0.2×	6.3k 1.6×	806 0.3×	940 0.6×	1.1k 0.8×	249	11.9k
Boris Turk Slovenia	65	611 0.1×	7.7k 2.0×	677 0.3×	848 0.6×	669 0.5×	231	16.1k
Yang Ding China	35	1.3k 0.3×	3.4k 0.9×	796 0.3×	956 0.6×	555 0.4×	108	6.9k

Countries citing papers authored by Hiroyuki Koyama

Since Specialization

Citations

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

Fields of papers citing papers by Hiroyuki Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroyuki Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroyuki Koyama. A scholar is included among the top collaborators of Hiroyuki 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 Hiroyuki Koyama. Hiroyuki 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

Koyama, Hiroyuki, et al.. (2024). Ability of Nutrient Management and Molecular Physiology Advancements to Overcome Abiotic Stress: A Study on Sub-Saharan African Crops. Agriculture. 14(2). 285–285. 7 indexed citations

Sahoo, Smita, et al.. (2023). Differential Transcriptional Regulation of Drought Stress Revealed by Comparative RNA-seq Analysis of Contrasting indica Rice from North East India. Journal of Plant Growth Regulation. 42(9). 5780–5795. 4 indexed citations

Tokizawa, Mutsutomo, Hiroki Ito, Yuriko Kobayashi, et al.. (2021). High affinity promoter binding of STOP1 is essential for early expression of novel aluminum-induced resistance genes GDH1 and GDH2 in Arabidopsis. Journal of Experimental Botany. 72(7). 2769–2789. 47 indexed citations

Hieno, Ayaka, Hushna Ara Naznin, Tomoko Yokogawa, et al.. (2019). Transcriptome Analysis and Identification of a Transcriptional Regulatory Network in the Response to H₂O₂. PLANT PHYSIOLOGY. 180(3). 1629–1646. 39 indexed citations

Kobayashi, Yuriko, et al.. (2018). Organic acid excretion from roots: a plant mechanism for enhancing phosphorus acquisition, enhancing aluminum tolerance, and recruiting beneficial rhizobacteria. Soil Science & Plant Nutrition. 64(6). 697–704. 59 indexed citations

Kamara, Mohamed M., et al.. (2014). Estimation combining ability of some maize inbred lines using line x tester mating design under two nitrogen levels. Australian Journal of Crop Science. 8(9). 1336–1342. 18 indexed citations

Hieno, Ayaka, Hushna Ara Naznin, Mitsuro Hyakumachi, et al.. (2013). ppdb: plant promoter database version 3.0. Nucleic Acids Research. 42(D1). D1188–D1192. 59 indexed citations

Ismail, Mohd Razi, et al.. (2011). Reduction of Al-induced oxidative damage in wheat. Australian Journal of Crop Science. 5(10). 1157–1162. 2 indexed citations

Hashimoto, Takuya, Hiroyuki Koyama, Tetsuro Miyata, et al.. (2009). Selective and Sustained Delivery of Basic Fibroblast Growth Factor (bFGF) for Treatment of Peripheral Arterial Disease: Results of a Phase I Trial. European Journal of Vascular and Endovascular Surgery. 38(1). 71–75. 30 indexed citations

10.

Iuchi, Satoshi, Hiroyuki Koyama, Yasufumi Kobayashi, et al.. (2007). Zinc finger protein STOP1 is critical for proton tolerance in Arabidopsis and coregulates a key gene in aluminum tolerance. Proceedings of the National Academy of Sciences. 104(23). 9900–9905. 335 indexed citations

11.

Hoekenga, Owen A., Lyza Maron, Miguel A. Piñeros, et al.. (2006). AtALMT1 , which encodes a malate transporter, is identified as one of several genes critical for aluminum tolerance in Arabidopsis. Proceedings of the National Academy of Sciences. 103(25). 9738–9743. 459 indexed citations

12.

Yamamoto, Ko, et al.. (2006). Plantar Flexion as an Alternative to Treadmill Exercise for Evaluating Patients with Intermittent Claudication. European Journal of Vascular and Endovascular Surgery. 33(3). 325–329. 16 indexed citations

13.

Hohdatsu, Tsutomu, Kayoko Sato, Yumi Suzuki, et al.. (2005). Dual-subtype vaccine (Fel-O-Vax FIV) protects cats against contact challenge with heterologous subtype B FIV infected cats. Veterinary Microbiology. 108(3-4). 155–165. 42 indexed citations

14.

Hohdatsu, Tsutomu, et al.. (1998). Genetic subtyping and epidemiological study of feline immunodeficiency virus by nested polymerase chain reaction-restriction fragment length polymorphism analysis of the gag gene. Journal of Virological Methods. 70(1). 107–111. 36 indexed citations

15.

Gu, Minghua, Hiroyuki Koyama, & Tetsuo Hara. (1998). Effects of Silicon Supply on Amelioration of Aluminum Injury and Chemical Forms of Aluminum in Rice Plants. Nihon Dojo Hiryogaku zasshi/Nippon dojō hiryōgaku zasshi. 69(5). 498–505. 5 indexed citations

16.

Koyama, Hiroyuki, Eiji Takita, & Tetsuo Hara. (1997). ALTERATION OF CARBHYDRATE METABOLISM IN ALUMINUM PHOSPHATE UTILIZING CARROT (Daucus carota L.) CELLS. Plant and Cell Physiology. 38. 1 indexed citations

17.

Johnson, Calvin M., Barbara A. Torres, Hiroyuki Koyama, & Janet K. Yamamoto. (1994). FIV as a Model for AIDS Vaccination. AIDS Research and Human Retroviruses. 10(3). 225–228. 29 indexed citations

18.

Koyama, Hiroyuki, et al.. (1981). Continuous cell culture from chick embryos inoculated with rev strain t. Avian Pathology. 10(2). 151–162. 5 indexed citations

19.

Koyama, Hiroyuki, et al.. (1975). Cause of "nakanuke" in chickens. II. Isolation of C-type virus from material infected with turkey herpesvirus.. Munich Personal RePEc Archive (Ludwig Maximilian University of Munich). 48(2-3). 93–105. 3 indexed citations

20.

Koyama, Hiroyuki, et al.. (1973). Long term existence of Rift Valley Fever virus in immune mice.. PubMed. 46(3-4). 105–12. 6 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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