Unni Johansen

623 total citations
8 papers, 494 citations indexed

About

Unni Johansen is a scholar working on Toxicology, Spectroscopy and Molecular Biology. According to data from OpenAlex, Unni Johansen has authored 8 papers receiving a total of 494 indexed citations (citations by other indexed papers that have themselves been cited), including 7 papers in Toxicology, 3 papers in Spectroscopy and 2 papers in Molecular Biology. Recurrent topics in Unni Johansen's work include Forensic Toxicology and Drug Analysis (7 papers), Analytical Chemistry and Chromatography (3 papers) and Cannabis and Cannabinoid Research (2 papers). Unni Johansen is often cited by papers focused on Forensic Toxicology and Drug Analysis (7 papers), Analytical Chemistry and Chromatography (3 papers) and Cannabis and Cannabinoid Research (2 papers). Unni Johansen collaborates with scholars based in Norway and Brazil. Unni Johansen's co-authors include Elisabeth Leere Øiestad, Asbjørg S. Christophersen, Åse Marit Leere Øiestad, Ritva Karinen, Solfrid Hegstad, Hallvard Gjerde, Per T. Normann, Jørg Mørland, Terje Assum and Lena Kristoffersen and has published in prestigious journals such as SHILAP Revista de lepidopterología, Clinical Chemistry and Accident Analysis & Prevention.

In The Last Decade

Unni Johansen

8 papers receiving 474 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Unni Johansen Norway	8	374	121	116	102	81	8	494
Kaarina Langel Finland	8	344 0.9×	145 1.2×	121 1.0×	76 0.7×	44 0.5×	10	470
Stefan Steinmeyer Germany	9	391 1.0×	183 1.5×	114 1.0×	137 1.3×	67 0.8×	12	553
Ashraf Mozayani United States	15	280 0.7×	99 0.8×	80 0.7×	126 1.2×	49 0.6×	38	646
Dean Fritch United States	10	399 1.1×	254 2.1×	116 1.0×	98 1.0×	46 0.6×	10	569
Claudia Vignali Italy	18	529 1.4×	91 0.8×	113 1.0×	160 1.6×	83 1.0×	49	783
Carol L. O'Neal United States	11	365 1.0×	85 0.7×	130 1.1×	106 1.0×	41 0.5×	13	617
Hazel J. Torrance United Kingdom	11	295 0.8×	117 1.0×	50 0.4×	72 0.7×	54 0.7×	16	447
Helga Köhler Germany	15	170 0.5×	73 0.6×	70 0.6×	118 1.2×	51 0.6×	33	549
Katja Schulz Germany	9	237 0.6×	198 1.6×	89 0.8×	60 0.6×	57 0.7×	16	567
Niclas Nikolai Stephanson Sweden	11	248 0.7×	58 0.5×	116 1.0×	147 1.4×	35 0.4×	15	528

Countries citing papers authored by Unni Johansen

Since Specialization

Citations

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

Fields of papers citing papers by Unni Johansen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Unni Johansen

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

All Works

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8 of 8 papers shown

Karinen, Ritva, Silja Skogstad Tuv, Sidsel Rogde, et al.. (2014). Lethal poisonings with AH-7921 in combination with other substances. Forensic Science International. 244. e21–e24. 56 indexed citations

Vindenes, Vigdis, et al.. (2014). Very long Detection Times after High and repeated intake of Heroin and Methadone, measured in Oral Fluid. SHILAP Revista de lepidopterología. 20(2). 34–41. 7 indexed citations

Øiestad, Elisabeth Leere, et al.. (2013). Screening of Synthetic Cannabinoids in Preserved Oral Fluid by UPLC–MS/MS. Bioanalysis. 5(18). 2257–2268. 34 indexed citations

Øiestad, Elisabeth Leere, Unni Johansen, Åse Marit Leere Øiestad, & Asbjørg S. Christophersen. (2011). Drug Screening of Whole Blood by Ultra-Performance Liquid Chromatography-Tandem Mass Spectrometry. Journal of Analytical Toxicology. 35(5). 280–293. 101 indexed citations

Øiestad, Elisabeth Leere, Unni Johansen, Mimi Stokke Opdal, Stein Bergan, & Asbjørg S. Christophersen. (2009). Determination of Digoxin and Digitoxin in Whole Blood. Journal of Analytical Toxicology. 33(7). 372–378. 21 indexed citations

Gjerde, Hallvard, Per T. Normann, Terje Assum, et al.. (2008). Prevalence of alcohol and drugs among Norwegian motor vehicle drivers: A roadside survey. Accident Analysis & Prevention. 40(5). 1765–1772. 99 indexed citations

Øiestad, Elisabeth Leere, Unni Johansen, & Asbjørg S. Christophersen. (2006). Drug Screening of Preserved Oral Fluid by Liquid Chromatography–Tandem Mass Spectrometry. Clinical Chemistry. 53(2). 300–309. 129 indexed citations

Hegstad, Solfrid, Elisabeth Leere Øiestad, Unni Johansen, & Asbjørg S. Christophersen. (2006). Determination of Benzodiazepines in Human Urine using Solid-Phase Extraction and High-Performance Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry. Journal of Analytical Toxicology. 30(1). 31–37. 47 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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