Helmut Freitag

3.1k total citations
70 papers, 2.3k citations indexed

About

Helmut Freitag is a scholar working on Plant Science, Ecology, Evolution, Behavior and Systematics and Molecular Biology. According to data from OpenAlex, Helmut Freitag has authored 70 papers receiving a total of 2.3k indexed citations (citations by other indexed papers that have themselves been cited), including 52 papers in Plant Science, 45 papers in Ecology, Evolution, Behavior and Systematics and 15 papers in Molecular Biology. Recurrent topics in Helmut Freitag's work include Mediterranean and Iberian flora and fauna (41 papers), Plant Diversity and Evolution (24 papers) and Botany and Plant Ecology Studies (18 papers). Helmut Freitag is often cited by papers focused on Mediterranean and Iberian flora and fauna (41 papers), Plant Diversity and Evolution (24 papers) and Botany and Plant Ecology Studies (18 papers). Helmut Freitag collaborates with scholars based in Germany, Russia and United States. Helmut Freitag's co-authors include Gudrun Kadereit, Kurt Weising, Walter Neupert, Roland Benz, Thomas Borsch, Gerald E. Edwards, Elena V. Voznesenskaya, Vincent R. Franceschi, Olavi Kiirats and W. Stichler and has published in prestigious journals such as Nature, Journal of Biological Chemistry and Circulation.

In The Last Decade

Helmut Freitag

68 papers receiving 2.2k citations

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author Last Decade Papers Cites
Helmut Freitag 1.1k 1.1k 978 185 168 70 2.3k
Maurice S. B. Ku 3.1k 2.7× 3.2k 2.9× 656 0.7× 557 3.0× 138 0.8× 114 4.7k
Stephen Rawsthorne 2.0k 1.8× 2.2k 2.0× 215 0.2× 259 1.4× 86 0.5× 68 3.3k
Kenneth W. Joy 1.4k 1.2× 2.4k 2.1× 388 0.4× 110 0.6× 271 1.6× 65 3.1k
Martine Thomas 1.7k 1.4× 2.4k 2.2× 295 0.3× 89 0.5× 168 1.0× 29 3.1k
John H. Bothwell 1.2k 1.1× 1.7k 1.6× 138 0.1× 134 0.7× 55 0.3× 28 2.8k
Clanton C. Black 1.4k 1.3× 2.0k 1.8× 318 0.3× 199 1.1× 230 1.4× 87 2.8k
Gunnar Wingsle 2.6k 2.3× 2.7k 2.4× 178 0.2× 126 0.7× 70 0.4× 82 4.1k
Claus Schnarrenberger 1.7k 1.5× 1.1k 1.0× 141 0.1× 377 2.0× 97 0.6× 76 2.5k
F. V. Minibayeva 1.1k 1.0× 2.2k 2.0× 612 0.6× 51 0.3× 105 0.6× 117 3.1k
Tetsuko Takabe 1.6k 1.4× 2.2k 2.0× 158 0.2× 230 1.2× 76 0.5× 75 3.2k

Countries citing papers authored by Helmut Freitag

Since Specialization
Citations

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

Fields of papers citing papers by Helmut Freitag

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Helmut Freitag

This figure shows the co-authorship network connecting the top 25 collaborators of Helmut Freitag. A scholar is included among the top collaborators of Helmut Freitag 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 Helmut Freitag. Helmut Freitag 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.
Iamonico, Duilio, Helmut Freitag, & Charles E. Jarvis. (2024). (3011) Proposal to conserve the name Polpoda capensis against Camphorosma paleacea (Molluginaceae). Taxon. 73(1). 313–314.
2.
Mosyakin, Sergei L. & Helmut Freitag. (2023). (3000) Proposal to conserve the name Soda against Sevada (Chenopodiaceae s.str. / Amaranthaceae s.l.). Taxon. 72(6). 1371–1373. 1 indexed citations
3.
Iamonico, Duilio & Helmut Freitag. (2023). (2971) Proposal to conserve the name Polycnemum majus against Camphorosma acuta (Amaranthaceae s.l.). Taxon. 72(4). 929–930. 1 indexed citations
4.
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6.
Alonso-Vargas, M. Ángeles, Manuel B. Crespo, & Helmut Freitag. (2017). Salicornia cuscoensis (Amaranthaceae/Chenopodiaceae), a new species from Peru (South America). Phytotaxa. 319(3). 3 indexed citations
7.
Freitag, Helmut, et al.. (2017). Restoration of Suaeda sect. Helicilla (Chenopodiaceae) and typification of its related taxa. Phytotaxa. 323(1). 2 indexed citations
8.
Freitag, Helmut, et al.. (2016). Molecular phylogeny and forms of photosynthesis in tribe Salsoleae (Chenopodiaceae). Journal of Experimental Botany. 68(2). 207–223. 32 indexed citations
9.
Freitag, Helmut & Duilio Iamonico. (2015). Lectotypification of the name Polycnemum majus (Amaranthaceae s.str.). Phytotaxa. 202(3). 6 indexed citations
10.
Nepi, Chiara, Lorenzo Cecchi, Helmut Freitag, et al.. (2015). The Lybian collections in FI (Herbarium Centrale Italicum and Webb Herbarium) and studies on the Lybian flora by R. Pampanini – Part 1. CINECA IRIS Institutial research information system (University of Pisa). 27(2). 3–132. 2 indexed citations
11.
Kadereit, Gudrun, et al.. (2014). When do different C4 leaf anatomies indicate independent C4 origins? Parallel evolution of C4 leaf types in Camphorosmeae (Chenopodiaceae). Journal of Experimental Botany. 65(13). 3499–3511. 23 indexed citations
12.
Sennikov, Alexander N. & Helmut Freitag. (2014). The nomenclatural history of Salsola sedoides L. and Salsola sedoides Pall. (Suaedoideae and Camphorosmoideae, Chenopodiaceae/Amaranthaceae). Taxon. 63(1). 151–160. 3 indexed citations
13.
Freitag, Helmut, et al.. (2013). Suaeda iranshahrii, a new species of Suaeda subgenus Brezia (Chenopodiaceae) from the Persian Gulf coasts. SHILAP Revista de lepidopterología. 4 indexed citations
14.
Freitag, Helmut, et al.. (2009). The genus Halothamnus Jaub. & spach (Chenopodiaceae) in Turkey. TURKISH JOURNAL OF BOTANY. 33(5). 325–334. 4 indexed citations
15.
Voznesenskaya, Elena V., Simon D. X. Chuong, Nuria K. Koteyeva, et al.. (2007). Structural, Biochemical, and Physiological Characterization of C4 Photosynthesis in Species Having Two Vastly Different Types of Kranz Anatomy in Genus Suaeda (Chenopodiaceae). Plant Biology. 9(6). 745–757. 17 indexed citations
16.
Beierlein, W, Helmut Freitag, Renate Kaulitz, et al.. (2004). Excision of the Coronary Orifices in Arterial Switch Operation: “O” Like Obstructive and “U” Like Unobstructive?. The Thoracic and Cardiovascular Surgeon. 52(3). 169–173. 3 indexed citations
17.
Voznesenskaya, Elena V., et al.. (2002). Proof of C4 photosynthesis without Kranz anatomy in Bienertia cycloptera (Chenopodiaceae). The Plant Journal. 31(5). 649–662. 136 indexed citations
18.
Voznesenskaya, Elena V., Vincent R. Franceschi, Olavi Kiirats, Helmut Freitag, & Gerald E. Edwards. (2001). Kranz anatomy is not essential for terrestrial C4 plant photosynthesis. Nature. 414(6863). 543–546. 221 indexed citations
19.
Freitag, Helmut, Alexander Neumeister, H. Pusch, et al.. (1996). CARBOHYDRATE-DEFICIENT TRANSFERRIN AS A SCREENING MARKER FOR DRINKING IN A GENERAL HOSPITAL POPULATION. Alcohol and Alcoholism. 31(3). 249–256. 28 indexed citations
20.
Pfaller, Rupert, Helmut Freitag, Matthew A. Harmey, Roland Benz, & Walter Neupert. (1985). A water-soluble form of porin from the mitochondrial outer membrane of Neurospora crassa. Journal of Biological Chemistry. 16 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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