Stephan A. Jonker

1.2k total citations
37 papers, 1.0k citations indexed

About

Stephan A. Jonker is a scholar working on Molecular Biology, Biochemistry and Physical and Theoretical Chemistry. According to data from OpenAlex, Stephan A. Jonker has authored 37 papers receiving a total of 1.0k indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Molecular Biology, 14 papers in Biochemistry and 13 papers in Physical and Theoretical Chemistry. Recurrent topics in Stephan A. Jonker's work include Traditional and Medicinal Uses of Annonaceae (14 papers), Photochemistry and Electron Transfer Studies (13 papers) and Spectroscopy and Quantum Chemical Studies (6 papers). Stephan A. Jonker is often cited by papers focused on Traditional and Medicinal Uses of Annonaceae (14 papers), Photochemistry and Electron Transfer Studies (13 papers) and Spectroscopy and Quantum Chemical Studies (6 papers). Stephan A. Jonker collaborates with scholars based in Netherlands, Tanzania and Germany. Stephan A. Jonker's co-authors include John M. Warman, Wouter Schuddeboom, Klaas A. Zachariasse, Wolfgang Kuehnle, Uwe Leinhos, Mayunga H.H. Nkunya, J. W. Verhoeven, Freek Ariese, Michael N. Paddon‐Row and Reiner Waibel and has published in prestigious journals such as Journal of the American Chemical Society, The Journal of Physical Chemistry and Chemical Physics Letters.

In The Last Decade

Stephan A. Jonker

36 papers receiving 964 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Stephan A. Jonker Netherlands 17 528 387 279 216 179 37 1.0k
A. Bromberg Israel 19 237 0.4× 220 0.6× 286 1.0× 159 0.7× 122 0.7× 32 1.2k
Basudeb Haldar India 20 460 0.9× 582 1.5× 482 1.7× 179 0.8× 76 0.4× 31 1.5k
Alexander D. Roshal Ukraine 17 531 1.0× 379 1.0× 498 1.8× 129 0.6× 89 0.5× 88 1.0k
Joel M. Kauffman United States 17 202 0.4× 220 0.6× 414 1.5× 63 0.3× 134 0.7× 62 852
B. Kojić-Prodić Croatia 20 327 0.6× 298 0.8× 453 1.6× 36 0.2× 71 0.4× 86 1.1k
Reinhard Machinek Germany 16 246 0.5× 174 0.4× 336 1.2× 137 0.6× 66 0.4× 33 715
Heinz Kolshorn Germany 22 142 0.3× 464 1.2× 941 3.4× 66 0.3× 440 2.5× 76 1.7k
G. van Ginkel Netherlands 19 145 0.3× 118 0.3× 156 0.6× 266 1.2× 36 0.2× 40 870
Mari Kubota Japan 12 104 0.2× 194 0.5× 977 3.5× 108 0.5× 124 0.7× 25 1.4k
D. Gegiou Greece 13 296 0.6× 311 0.8× 291 1.0× 107 0.5× 56 0.3× 24 702

Countries citing papers authored by Stephan A. Jonker

Since Specialization
Citations

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

Fields of papers citing papers by Stephan A. Jonker

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Stephan A. Jonker. 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 Stephan A. Jonker. The network helps show where Stephan A. Jonker may publish in the future.

Co-authorship network of co-authors of Stephan A. Jonker

This figure shows the co-authorship network connecting the top 25 collaborators of Stephan A. Jonker. A scholar is included among the top collaborators of Stephan A. Jonker 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 Stephan A. Jonker. Stephan A. Jonker 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.
Jonker, Stephan A., Eva Schaake, Karel A. Hinnen, et al.. (2025). Omission of Contralateral Systematic Biopsies in Unilateral Suspicious Prostate Cancer on Magnetic Resonance Imaging: Implications for Radiation Treatment Selection. European Urology Open Science. 73. 17–23.
2.
Malebo, Hamisi M., Stephan A. Jonker, Reiner Waibel, & Mayunga H.H. Nkunya. (2014). Diprenylated Indole Alkaloids from Fruits of Hexalobus monopetalus. Natural Products and Bioprospecting. 4(2). 101–105. 5 indexed citations
3.
Malebo, Hamisi M., et al.. (2014). Antifungal Enantiomeric Styrylpyrones from Sanrafaelia ruffonammari and Ophrypetalum odoratum. Natural Products and Bioprospecting. 4(2). 129–133. 4 indexed citations
4.
Nkunya, Mayunga H.H., et al.. (2004). Prenylindoles from TanzanianMonodoraandIsolonaSpecies. Natural Product Research. 18(3). 253–258. 28 indexed citations
5.
Nkunya, Mayunga H.H., et al.. (2003). (±)-Schefflone: a trimeric monoterpenoid from the root bark of Uvaria scheffleri. Phytochemistry. 65(4). 399–404. 20 indexed citations
6.
Jonker, Stephan A., et al.. (2003). The caulindoles: dimeric prenylindoles from Isolona cauliflora. Phytochemistry. 65(2). 227–232. 25 indexed citations
7.
Nkunya, Mayunga H.H., et al.. (2000). Aporphinoid alkaloids and other constituents from Lettowianthus stellatus. Phytochemistry. 53(8). 1067–1073. 21 indexed citations
8.
Jonker, Stephan A., et al.. (1999). Ophrypetalin and Other Annonaceous Acetogenins FromOphrypetalum Odoratum. Natural product letters. 13(3). 195–202. 8 indexed citations
9.
Mdee, Ladislaus K., Reiner Waibel, Mayunga H.H. Nkunya, Stephan A. Jonker, & Hans Achenbach. (1998). Rosane diterpenes and bis-dinorditerpenes from hugonia CASTENEIFOLIAfn2fn2Part 87 in the series Constituents of Tropical Medicinal Plants. For part 86 see Ref. [1].. Phytochemistry. 49(4). 1107–1113. 20 indexed citations
10.
Achenbach, Hans, et al.. (1997). Oxygenated pyrenes, their potential biosynthetic precursor and benzylated dihydroflavones from two African Uvaria species. Phytochemistry. 44(2). 359–364. 24 indexed citations
11.
Jonker, Stephan A., et al.. (1997). In vitro trypanocidal activity of some rare Tanzanian medicinal plants. Acta Tropica. 67(3). 181–185. 29 indexed citations
12.
Jonker, Stephan A., et al.. (1997). In vitro trypanocidal activity of some rare Tanzanian medicinal plants. Acta Tropica. 66(2). 79–83. 13 indexed citations
13.
Nkunya, Mayunga H.H., Stephan A. Jonker, Ladislaus K. Mdee, Reiner Waibel, & Hans Achenbach. (1996). New Diprenylated Indoles fromAsteranthe Asterias(Annonaceae). Natural product letters. 9(1). 71–78. 12 indexed citations
14.
Schuddeboom, Wouter, Stephan A. Jonker, John M. Warman, et al.. (1993). Sudden polarization in the twisted, phantom state of tetraphenylethylene detected by time-resolved microwave conductivity. Journal of the American Chemical Society. 115(8). 3286–3290. 65 indexed citations
15.
Warman, John M., Stephan A. Jonker, Matthijs P. de Haas, Jan W. Verhoeven, & Michael N. Paddon‐Row. (1993). Opto-Electric Molecules Studied by Time-Resolved Microwave Conductivity (Trmc). Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals. 234(1). 121–126. 1 indexed citations
16.
Schuddeboom, Wouter, Stephan A. Jonker, John M. Warman, et al.. (1992). Excited-state dipole moments of dual fluorescent 4-(dialkylamino)benzonitriles: influence of alkyl chain length and effective solvent polarity. The Journal of Physical Chemistry. 96(26). 10809–10819. 335 indexed citations
17.
Brouwer, Albert M., et al.. (1991). Charge separation in the excited state electron donor—acceptor compounds containing the piperazine moiety. Chemical Physics Letters. 180(6). 556–562. 15 indexed citations
18.
Jonker, Stephan A., et al.. (1990). Solid-State Structure and Spectroscopy of Chromoionophoric Acridinium Derivatives. Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics. 183(1). 273–282. 33 indexed citations
19.
Jonker, Stephan A., Freek Ariese, & J. W. Verhoeven. (1989). Cation complexation with functionalized 9‐arylacridinium ions: Possible applications in the development of cation‐selective optical probes. Recueil des Travaux Chimiques des Pays-Bas. 108(3). 109–115. 59 indexed citations
20.
Jonker, Stephan A., et al.. (1985). Electrochemistry of the 9‐phenyl‐10‐methyl‐acridan/acridinium redox system; a high‐potential NADH/NAD+ analogue. Recueil des Travaux Chimiques des Pays-Bas. 104(11). 296–302. 38 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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