Koei Hamana

2.7k total citations
139 papers, 2.1k citations indexed

About

Koei Hamana is a scholar working on Molecular Biology, Biochemistry and Ecology. According to data from OpenAlex, Koei Hamana has authored 139 papers receiving a total of 2.1k indexed citations (citations by other indexed papers that have themselves been cited), including 127 papers in Molecular Biology, 44 papers in Biochemistry and 23 papers in Ecology. Recurrent topics in Koei Hamana's work include Polyamine Metabolism and Applications (105 papers), Amino Acid Enzymes and Metabolism (43 papers) and Protist diversity and phylogeny (20 papers). Koei Hamana is often cited by papers focused on Polyamine Metabolism and Applications (105 papers), Amino Acid Enzymes and Metabolism (43 papers) and Protist diversity and phylogeny (20 papers). Koei Hamana collaborates with scholars based in Japan, Czechia and United Kingdom. Koei Hamana's co-authors include Shigeru Matsuzaki, Masaru Niitsu, Keijiro Samejima, Koichi Iwai, Takashi Itoh, Mariko Takeuchi, Hiroshi Hamana, Masanori Okanishi, Akira Yokota and HAMAO UMEZAWA and has published in prestigious journals such as Science, Nucleic Acids Research and Molecular and Cellular Biology.

In The Last Decade

Koei Hamana

130 papers receiving 1.9k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Koei Hamana Japan 25 1.8k 447 430 354 168 139 2.1k
Luke A. Moe United States 20 711 0.4× 361 0.8× 196 0.5× 564 1.6× 112 0.7× 41 1.8k
A R Strøm Norway 20 1.6k 0.9× 424 0.9× 265 0.6× 706 2.0× 200 1.2× 27 2.8k
S. L. MacKenzie Canada 28 1.6k 0.9× 196 0.4× 1.1k 2.7× 994 2.8× 206 1.2× 85 2.8k
Ze’ev Barak Israel 28 1.3k 0.7× 168 0.4× 625 1.5× 265 0.7× 47 0.3× 69 2.0k
Patricia H. Clarke United Kingdom 24 1.3k 0.7× 266 0.6× 209 0.5× 289 0.8× 120 0.7× 63 1.9k
Supapon Cheevadhanarak Thailand 27 1.2k 0.7× 113 0.3× 253 0.6× 276 0.8× 74 0.4× 96 1.8k
Antonio Sánchez-Amat Spain 28 1.1k 0.6× 393 0.9× 211 0.5× 567 1.6× 36 0.2× 58 2.0k
Georg Hölzl Germany 19 968 0.5× 132 0.3× 424 1.0× 562 1.6× 46 0.3× 33 1.5k
D. Steven Hill United States 15 2.1k 1.2× 485 1.1× 144 0.3× 1.4k 3.9× 125 0.7× 18 4.0k
Wilhelm Boland Germany 33 1.3k 0.7× 213 0.5× 165 0.4× 1.4k 3.8× 95 0.6× 118 3.6k

Countries citing papers authored by Koei Hamana

Since Specialization
Citations

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

Fields of papers citing papers by Koei Hamana

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Koei Hamana

This figure shows the co-authorship network connecting the top 25 collaborators of Koei Hamana. A scholar is included among the top collaborators of Koei Hamana 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 Koei Hamana. Koei Hamana 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.
Hamana, Koei & Masaru Niitsu. (2025). OCCURRENCE OF TWO BRANCHED PENTA-AMINES IN LEGUME SEEDS HAS NOT BEEN CONFIRMED. 11(5). 1647–1654.
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Hamana, Koei, et al.. (2006). Cellular polyamine catalogues of the five classes of the phylum Proteobacteria: distributions of homospermidine within the class Alphaproteobacteria, hydroxyputrescine within the class Betaproteobacteria, norspermidine within the class Gammaproteobacteria, and spermine within the classes Deltaproteobacteria and Epsilonproteobacteria. 27. 1–16. 27 indexed citations
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Hamana, Koei, et al.. (2003). Absence of Cellular Triamines in Four Novel Flavobacteria Located in Flavobacterium - Flexibacter - Cytophaga Complex. 24. 13–16. 5 indexed citations
8.
Tanaka, Takehiko, Koei Hamana, & Takashi Itoh. (2002). Polyamine Analysis of Extremely Halophilic Archaebacteria and Methanogenic Archaebacteria. 23. 137–143. 6 indexed citations
9.
Hamana, Koei. (2001). Polyamine Distribution Profiles in Thiobacillus, Thiomonas, Acidithiobacillus Thermithiobacillus and Halothiobacillus. 21. 1–5. 1 indexed citations
10.
Hamana, Koei, Hiroshi Hamana, & Takashi Itoh. (1999). Polyamine Analysis of Extremely Halophilic Archaebacteria. 19(19). 1–4. 5 indexed citations
11.
Hamana, Koei, Masaru Niitsu, Keijiro Samejima, & Shigeru Matsuzaki. (1992). N4-Methylthermospermine in leguminous seeds. Phytochemistry. 31(4). 1410–1412. 10 indexed citations
12.
Hamana, Koei, et al.. (1991). Polyamine distributions in the Flavobacterium–Cytophaga–Sphingobacterium complex. Canadian Journal of Microbiology. 37(11). 885–888. 18 indexed citations
13.
Hamana, Koei, Masaru Niitsu, Keijiro Samejima, & Shigeru Matsuzaki. (1990). Thermopentamine, a novel linear pentaamine found inThermus thermophilus. FEMS Microbiology Letters. 68(1-2). 27–30. 10 indexed citations
14.
Hamana, Koei, Kiwamu Minamisawa, & Shigeru Matsuzaki. (1990). Polyamines in Rhizobium, Bradyrhizobium, Azorhizobium and Argobacterium. FEMS Microbiology Letters. 71(1-2). 71–76. 16 indexed citations
15.
Hamana, Koei, et al.. (1989). Distribution of spermine in bacilli and lactic acid bacteria. Canadian Journal of Microbiology. 35(4). 450–455. 38 indexed citations
16.
Kamekura, Masahiro, Koei Hamana, & Shigeru Matsuzaki. (1987). Polyamine contents and amino acid decarboxylation activities of extremely halophilic archaebacteria and some eubacteria. FEMS Microbiology Letters. 43(3). 301–305. 21 indexed citations
17.
Hamana, Koei & Shigeru Matsuzaki. (1987). Distribution of polyamines in actinomycetes. FEMS Microbiology Letters. 41(3). 211–215. 19 indexed citations
18.
Matsuzaki, Shigeru, Koei Hamana, Masaru Niitsu, Keijiro Samejima, & Satoshi Yamashita. (1987). Formation of aminopropylhomospermidine from homospermidine in yeasts and thermophilic bacilli. FEMS Microbiology Letters. 48(1-2). 1–4. 5 indexed citations
19.
Mita, Kazuei, Sachiko Ichimura, Mitsuo Zama, & Koei Hamana. (1981). Kinetics of chemical modification of arginine and lysine residues in calf thymus histone H1. Biopolymers. 20(6). 1103–1112. 7 indexed citations
20.
Hamana, Koei & Koichi Iwai. (1972). Nuclear Binding of Steroid Hormones : The Specificity and Binding Sites. 9. 69–82. 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.

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