Lothar Siekmann

2.3k total citations
83 papers, 1.8k citations indexed

About

Lothar Siekmann is a scholar working on Endocrinology, Diabetes and Metabolism, Physiology and Molecular Biology. According to data from OpenAlex, Lothar Siekmann has authored 83 papers receiving a total of 1.8k indexed citations (citations by other indexed papers that have themselves been cited), including 28 papers in Endocrinology, Diabetes and Metabolism, 18 papers in Physiology and 17 papers in Molecular Biology. Recurrent topics in Lothar Siekmann's work include Hormonal and reproductive studies (18 papers), Estrogen and related hormone effects (14 papers) and Clinical Laboratory Practices and Quality Control (13 papers). Lothar Siekmann is often cited by papers focused on Hormonal and reproductive studies (18 papers), Estrogen and related hormone effects (14 papers) and Clinical Laboratory Practices and Quality Control (13 papers). Lothar Siekmann collaborates with scholars based in Germany, United States and Belgium. Lothar Siekmann's co-authors include H. Breuer, Linda M. Thienpont, Gary L. Myers, Edward R. Ashwood, Anthony A. Killeen, W. Greg Miller, Edward Wang, H.‐O. Hoppen, Thomas P. J. Linsinger and Anja Keßler and has published in prestigious journals such as The Journal of Clinical Endocrinology & Metabolism, Biochemical Journal and Journal of Allergy and Clinical Immunology.

In The Last Decade

Lothar Siekmann

79 papers receiving 1.6k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Lothar Siekmann Germany 24 480 348 288 242 223 83 1.8k
Dietmar Stöckl Belgium 27 492 1.0× 513 1.5× 348 1.2× 171 0.7× 312 1.4× 84 2.0k
Claude Petitclerc Canada 23 459 1.0× 443 1.3× 404 1.4× 304 1.3× 64 0.3× 65 1.9k
Robert Rej United States 29 331 0.7× 416 1.2× 572 2.0× 53 0.2× 45 0.2× 100 2.8k
Nathan Gochman United States 17 237 0.5× 163 0.5× 291 1.0× 121 0.5× 71 0.3× 38 1.5k
Katleen Van Uytfanghe Belgium 26 1.1k 2.2× 279 0.8× 418 1.5× 57 0.2× 114 0.5× 61 2.0k
Uwe Kobold Germany 20 927 1.9× 466 1.3× 621 2.2× 53 0.2× 309 1.4× 50 2.7k
Susan S.-C. Tai United States 20 616 1.3× 115 0.3× 271 0.9× 66 0.3× 217 1.0× 46 1.6k
Florent Vanstapel Belgium 22 209 0.4× 333 1.0× 473 1.6× 36 0.1× 86 0.4× 69 1.7k
F Schiele France 16 357 0.7× 254 0.7× 245 0.9× 45 0.2× 39 0.2× 52 1.4k
Andrew W. Lyon Canada 27 209 0.4× 491 1.4× 473 1.6× 230 1.0× 69 0.3× 95 2.2k

Countries citing papers authored by Lothar Siekmann

Since Specialization
Citations

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

Fields of papers citing papers by Lothar Siekmann

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Lothar Siekmann

This figure shows the co-authorship network connecting the top 25 collaborators of Lothar Siekmann. A scholar is included among the top collaborators of Lothar Siekmann 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 Lothar Siekmann. Lothar Siekmann 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.
Ichihara, Kiyoshi, Ferruccio Ceriotti, Priscilla M.K. Poon, et al.. (2013). The Asian project for collaborative derivation of reference intervals: (1) strategy and major results of standardized analytes. Clinical Chemistry and Laboratory Medicine (CCLM). 51(7). 1429–42. 56 indexed citations
2.
Siekmann, Lothar. (2012). Metrological traceability – a concept for standardization in laboratory medicine. Clinical Chemistry and Laboratory Medicine (CCLM). 51(5). 953–7. 15 indexed citations
3.
Siekmann, Lothar. (2009). Implementation of the concept of traceability in laboratory medicine in external quality assessment. Clinical Biochemistry. 42(4-5). 293–294. 4 indexed citations
4.
Ludwig, Michael, Franz Rüschendorf, Kathrin Saar, et al.. (2008). Genome‐wide linkage scan for bladder exstrophy‐epispadias complex. Birth Defects Research Part A Clinical and Molecular Teratology. 85(2). 174–178. 15 indexed citations
5.
Steckelbroeck, Stephan, Matthias Watzka, F. Bidlingmaier, et al.. (2003). Characterisation of estrogenic 17β-hydroxysteroid dehydrogenase (17β-HSD) activity in the human brain. The Journal of Steroid Biochemistry and Molecular Biology. 86(1). 79–92. 31 indexed citations
6.
7.
Steckelbroeck, Stephan, Matthias Watzka, Dieter Lütjohann, et al.. (2002). Characterization of the dehydroepiandrosterone (DHEA) metabolism via oxysterol 7α‐hydroxylase and 17‐ketosteroid reductase activity in the human brain. Journal of Neurochemistry. 83(3). 713–726. 51 indexed citations
8.
Novak, Natalija, Jörg Haberstok, Stefan Kraft, et al.. (2001). Standardized extracts from Chinese herbs induce IL-10 production in human monocyte-derived dendritic cells and alter their differentiation in vitro. Journal of Allergy and Clinical Immunology. 108(4). 588–593. 21 indexed citations
9.
Panteghini, Mauro, Ferruccio Ceriotti, G. Schumann, & Lothar Siekmann. (2001). Establishing a Reference System in Clinical Enzymology. Clinical Chemistry and Laboratory Medicine (CCLM). 39(9). 795–800. 47 indexed citations
10.
Linsinger, Thomas P. J., et al.. (2001). Estimating the uncertainty of stability for matrix CRMs. Fresenius Journal of Analytical Chemistry. 370(2-3). 183–188. 99 indexed citations
11.
Linsinger, Thomas P. J., J. Pauwels, H. Schimmel, et al.. (2000). Estimation of the uncertainty of CRMs in accordance with GUM: Application to the certification of four enzyme CRMs. Fresenius Journal of Analytical Chemistry. 368(6). 589–594. 17 indexed citations
12.
13.
Heppner, Christina, Frank Petzke, Wiebke Arlt, et al.. (1995). Adrenocortical insufficiency in Rhodesian sleeping sickness is not attributable to suramin. Transactions of the Royal Society of Tropical Medicine and Hygiene. 89(1). 65–68. 2 indexed citations
14.
Arlt, Wiebke, Martín Reincke, Lothar Siekmann, W. Winkelmann, & Bruno Allolio. (1994). Suramin in adrenocortical cancer. Clinical Endocrinology. 1 indexed citations
15.
Reincke, Martín, Christina Heppner, Frank Petzke, et al.. (1994). Impairment of Adrenocortical Function Associated with Increased Plasma Tumor Necrosis Factor-Alpha and Interleukin-6 Concentrations in African Trypanosomiasis. NeuroImmunoModulation. 1(1). 14–22. 63 indexed citations
16.
Arlt, Wiebke, Martín Reincke, Lothar Siekmann, W. Winkelmann, & Bruno Allolio. (1994). Suramin in adrenocortical cancer: limited efficacy and serious toxicity. Clinical Endocrinology. 41(3). 299–307. 25 indexed citations
17.
Siekmann, Lothar. (1991). Reference Methods for Total Cholesterol and Total Glycerol. Clinical Chemistry and Laboratory Medicine (CCLM). 29(4). 277–9. 10 indexed citations
18.
Siekmann, Lothar. (1987). Measurement of thyroxine in human serum by isotope dilution mass spectrometry. Definitive methods in clinical chemistry, V. Journal of Mass Spectrometry. 14(11). 683–688. 18 indexed citations
19.
Siekmann, Lothar, et al.. (1976). Massenfragmentographische Bestimmung von Cholesterin im Serum — eine klinisch-chemische Referenzmethode. Fresenius Journal of Analytical Chemistry. 279(2). 26 indexed citations
20.
Siekmann, Lothar, H.‐O. Hoppen, & H. Breuer. (1970). Zur gas-chromatographisch-massenspektrometrischen Bestimmung von Steroidhormonen in Körperflüssigkeiten unter Verwendung eines Multiple Ion Detectors (Fragmentographie). Fresenius Zeitschrift für Analytische Chemie. 252(4-5). 294–298. 43 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Dietmar Stöckl Breakdown of academic impact, for papers by Claude Petitclerc Breakdown of academic impact, for papers by Robert Rej Breakdown of academic impact, for papers by Nathan Gochman Breakdown of academic impact, for papers by Katleen Van Uytfanghe Breakdown of academic impact, for papers by Uwe Kobold Breakdown of academic impact, for papers by Susan S.-C. Tai Breakdown of academic impact, for papers by Florent Vanstapel Breakdown of academic impact, for papers by F Schiele Breakdown of academic impact, for papers by Andrew W. Lyon
Rankless by CCL
2026