Kiyotaka Usui

690 total citations
34 papers, 522 citations indexed

About

Kiyotaka Usui is a scholar working on Pharmacology, Toxicology and Pharmacology. According to data from OpenAlex, Kiyotaka Usui has authored 34 papers receiving a total of 522 indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Pharmacology, 10 papers in Toxicology and 9 papers in Pharmacology. Recurrent topics in Kiyotaka Usui's work include Forensic Toxicology and Drug Analysis (10 papers), Cannabis and Cannabinoid Research (5 papers) and Analytical Chemistry and Chromatography (4 papers). Kiyotaka Usui is often cited by papers focused on Forensic Toxicology and Drug Analysis (10 papers), Cannabis and Cannabinoid Research (5 papers) and Analytical Chemistry and Chromatography (4 papers). Kiyotaka Usui collaborates with scholars based in Japan. Kiyotaka Usui's co-authors include Masato Funayama, Yoshie Hayashizaki, Masaki Hashiyada, Yoshito Kamijo, Yuji Fujita, Michiko Takai, Makoto Onodera, Yoshihiro Inoué, Y. Igari and Junichi Goto and has published in prestigious journals such as SHILAP Revista de lepidopterología, The Journal of Biochemistry and Journal of Pharmaceutical and Biomedical Analysis.

In The Last Decade

Kiyotaka Usui

31 papers receiving 514 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Kiyotaka Usui Japan 13 192 131 110 103 103 34 522
Sylvain Dulaurent France 15 211 1.1× 83 0.6× 86 0.8× 108 1.0× 142 1.4× 38 763
Maryam Akhgari Iran 16 163 0.8× 133 1.0× 102 0.9× 70 0.7× 59 0.6× 52 928
Jörg Teske Germany 15 273 1.4× 186 1.4× 132 1.2× 197 1.9× 72 0.7× 37 678
Stéphane Pirnay France 16 255 1.3× 178 1.4× 68 0.6× 84 0.8× 44 0.4× 31 754
Dag Helge Strand Norway 11 265 1.4× 109 0.8× 78 0.7× 169 1.6× 66 0.6× 16 547
Solfrid Hegstad Norway 16 237 1.2× 83 0.6× 143 1.3× 166 1.6× 44 0.4× 33 695
Jin Young Kim South Korea 16 342 1.8× 129 1.0× 109 1.0× 168 1.6× 51 0.5× 53 681
Ilpo Rasanen Finland 18 373 1.9× 89 0.7× 144 1.3× 292 2.8× 76 0.7× 40 901
Thomas Berg Norway 12 235 1.2× 72 0.5× 69 0.6× 168 1.6× 72 0.7× 24 539
Susanne Vogt Germany 13 198 1.0× 119 0.9× 129 1.2× 296 2.9× 127 1.2× 25 782

Countries citing papers authored by Kiyotaka Usui

Since Specialization
Citations

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

Fields of papers citing papers by Kiyotaka Usui

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Kiyotaka Usui

This figure shows the co-authorship network connecting the top 25 collaborators of Kiyotaka Usui. A scholar is included among the top collaborators of Kiyotaka Usui 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 Kiyotaka Usui. Kiyotaka Usui 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
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Usui, Kiyotaka, et al.. (2019). An ultra-rapid drug screening method for acetaminophen in blood serum based on probe electrospray ionization-tandem mass spectrometry. Journal of Food and Drug Analysis. 27(3). 786–792. 11 indexed citations
3.
Usui, Kiyotaka, et al.. (2019). A fast paraquat quantitation method in human serum using probe electrospray ionization–tandem mass spectrometry for emergency settings. Journal of Pharmacological and Toxicological Methods. 100. 106610–106610. 12 indexed citations
4.
Usui, Kiyotaka, et al.. (2019). Application of probe electrospray ionization-tandem mass spectrometry to ultra-rapid determination of glufosinate and glyphosate in human serum. Journal of Pharmaceutical and Biomedical Analysis. 174. 175–181. 19 indexed citations
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Usui, Kiyotaka, et al.. (2017). Identification of 5-Fluoro ADB in Human Whole Blood in Four Death Cases. Journal of Analytical Toxicology. 42(2). e21–e25. 29 indexed citations
7.
Usui, Akihito, Takashi Matsumura, Tadashi Hosoya, et al.. (2015). An autopsy case of death due to metabolic acidosis after citric acid ingestion. Legal Medicine. 17(6). 532–534. 2 indexed citations
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Igari, Y., Tadashi Hosoya, Yoshie Hayashizaki, et al.. (2014). Sudden death due to a cystic lesion in the cerebellum. Forensic Science International. 245. e25–e28. 1 indexed citations
10.
Usui, Kiyotaka, Masaki Hashiyada, Yoshie Hayashizaki, et al.. (2013). Application of modified QuEChERS method to liver samples for forensic toxicological analysis. Forensic Toxicology. 32(1). 139–147. 31 indexed citations
11.
Usui, Kiyotaka, Yoshie Hayashizaki, Masaki Hashiyada, & Masato Funayama. (2012). Rapid drug extraction from human whole blood using a modified QuEChERS extraction method. Legal Medicine. 14(6). 286–296. 86 indexed citations
12.
Hashiyada, Masaki, Kiyotaka Usui, Yoshie Hayashizaki, et al.. (2012). Unexpectedly high blood concentration of bisoprolol after an incorrect prescription: A case report. Legal Medicine. 15(2). 103–105. 3 indexed citations
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Usui, Kiyotaka, et al.. (2012). Simultaneous determination of 11 aconitum alkaloids in human serum and urine using liquid chromatography–tandem mass spectrometry. Legal Medicine. 14(3). 126–133. 23 indexed citations
15.
Hayashizaki, Yoshie, Kiyotaka Usui, Takuya Moriya, et al.. (2011). Unexpected infant death due to hypoplastic left heart syndrome: A case report. Legal Medicine. 13(6). 293–297.
16.
Usui, Kiyotaka, et al.. (2011). A case of death after ingestion of an agrochemical spreading agent. Forensic Science International. 210(1-3). 117–121. 4 indexed citations
17.
Yamada, Akio, et al.. (2007). . Japanese journal of pediatric nephrology. 20(1). 42–47.
18.
Usui, Kiyotaka, et al.. (2006). Simultaneous determination of pancuronium, vecuronium and their related compounds using LC–ESI-MS. Legal Medicine. 8(3). 166–171. 13 indexed citations
19.
Usui, Kiyotaka, et al.. (2005). Determination of chlorhexidine (CHD) and nonylphenolethoxylates (NPEOn) using LC-ESI-MS method and application to hemolyzed blood. Journal of Chromatography B. 831(1-2). 105–109. 20 indexed citations
20.
Usui, Kiyotaka, et al.. (2002). Formation of (R)-2, 3-Dihydrogeranylgeranoic Acid from Geranylgeraniol in Rat Thymocytes. The Journal of Biochemistry. 132(2). 327–334. 12 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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