Freya Schäfer

6.0k total citations · 1 hit paper
33 papers, 4.9k citations indexed

About

Freya Schäfer is a scholar working on Organic Chemistry, Molecular Biology and Biochemistry. According to data from OpenAlex, Freya Schäfer has authored 33 papers receiving a total of 4.9k indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Organic Chemistry, 7 papers in Molecular Biology and 7 papers in Biochemistry. Recurrent topics in Freya Schäfer's work include Free Radicals and Antioxidants (9 papers), Antioxidant Activity and Oxidative Stress (7 papers) and Electron Spin Resonance Studies (6 papers). Freya Schäfer is often cited by papers focused on Free Radicals and Antioxidants (9 papers), Antioxidant Activity and Oxidative Stress (7 papers) and Electron Spin Resonance Studies (6 papers). Freya Schäfer collaborates with scholars based in United States, Germany and Italy. Freya Schäfer's co-authors include Garry R. Buettner, C.F. Ng, V.G.J. Rodgers, Sujatha Venkataraman, Sean M. Martin, Shu‐Bing Qian, Min Wang, Anthony J. Fischer, Larry W. Oberley and Eric E. Kelley and has published in prestigious journals such as Analytical Biochemistry, Oncogene and Biochemical Journal.

In The Last Decade

Freya Schäfer

32 papers receiving 4.8k citations

Hit Papers

Redox environment of the cell as viewed through the redox... 2001 2026 2009 2017 2001 1000 2.0k 3.0k
What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

  1. Redox environment of the cell as viewed through the redox state of the glutathione disulfide/glutathione couple
    2001 3.7k citations Freya Schäfer, Garry R. Buettner Free Radical Biology and Medicine profile →

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Freya Schäfer United States 18 2.4k 715 620 547 455 33 4.9k
Diana A. Averill‐Bates Canada 34 2.9k 1.2× 410 0.6× 750 1.2× 376 0.7× 457 1.0× 93 6.0k
Fernando Antunes Portugal 37 3.3k 1.4× 491 0.7× 928 1.5× 387 0.7× 389 0.9× 82 5.7k
Rodrigo Franco United States 45 4.2k 1.8× 552 0.8× 891 1.4× 518 0.9× 379 0.8× 112 8.3k
Hiroyuki Arai Japan 51 4.3k 1.8× 665 0.9× 696 1.1× 648 1.2× 305 0.7× 188 7.9k
Aglaia Pappa Greece 46 3.3k 1.4× 400 0.6× 702 1.1× 368 0.7× 331 0.7× 133 6.8k
Giuseppina Barrera Italy 45 2.7k 1.1× 309 0.4× 476 0.8× 398 0.7× 375 0.8× 102 5.2k
Seppo Auriola Finland 49 3.4k 1.4× 436 0.6× 961 1.6× 325 0.6× 442 1.0× 240 8.5k
Vladimir Gogvadze Sweden 47 6.1k 2.5× 388 0.5× 1.0k 1.6× 627 1.1× 567 1.2× 121 10.1k
José M. Matés Spain 35 3.9k 1.6× 757 1.1× 713 1.1× 942 1.7× 288 0.6× 69 8.5k
Benoît D’Autréaux France 19 2.5k 1.0× 436 0.6× 480 0.8× 384 0.7× 347 0.8× 30 4.5k

Countries citing papers authored by Freya Schäfer

Since Specialization
Citations

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

Fields of papers citing papers by Freya Schäfer

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Freya Schäfer

This figure shows the co-authorship network connecting the top 25 collaborators of Freya Schäfer. A scholar is included among the top collaborators of Freya Schäfer 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 Freya Schäfer. Freya Schäfer 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.
Messmer, Monika, et al.. (2018). Plant breeding techniques. Organic Eprints (International Centre for Research in Organic Food Systems, and Research Institute of Organic Agriculture). 9 indexed citations
2.
Schäfer, Freya, et al.. (2017). Case Based Reasoning im Qualitätsmanagement*/Case Based Reasoning enhances quality management. wt Werkstattstechnik online. 107(11-12). 786–792. 1 indexed citations
3.
Messmer, Monika, et al.. (2015). Plant Breeding Techniques. An assessment for organic farming. Organic Eprints (International Centre for Research in Organic Food Systems, and Research Institute of Organic Agriculture). 9 indexed citations
4.
Schäfer, Freya, et al.. (2007). A simple and sensitive assay for ascorbate using a plate reader. Analytical Biochemistry. 365(1). 31–39. 61 indexed citations
5.
Ng, C.F., Freya Schäfer, Garry R. Buettner, & V.G.J. Rodgers. (2007). The rate of cellular hydrogen peroxide removal shows dependency on GSH: Mathematical insight intoin vivoH2O2and GPx concentrations. Free Radical Research. 41(11). 1201–1211. 106 indexed citations
6.
Buettner, Garry R., C.F. Ng, Min Wang, V.G.J. Rodgers, & Freya Schäfer. (2006). A New Paradigm: Manganese Superoxide Dismutase Influences the Production of H2O2 in Cells and Thereby Their Biological State. Free Radical Biology and Medicine. 41(8). 1338–1350. 151 indexed citations
7.
Kramarenko, G. G., et al.. (2006). Ascorbate enhances the toxicity of the photodynamic action of Verteporfin in HL-60 cells. Free Radical Biology and Medicine. 40(9). 1615–1627. 26 indexed citations
8.
Buettner, Garry R. & Freya Schäfer. (2006). Albert Szent-Gyorgyi: vitamin C identification. Biochemical Journal. c5–c5. 5 indexed citations
9.
Fischer, Anthony J., et al.. (2005). Nitric oxide as a cellular antioxidant: A little goes a long way. Free Radical Biology and Medicine. 40(3). 501–506. 117 indexed citations
10.
Wang, Min, Sujatha Venkataraman, Frederick E. Domann, et al.. (2005). Manganese superoxide dismutase suppresses hypoxic induction of hypoxia-inducible factor-1α and vascular endothelial growth factor. Oncogene. 24(55). 8154–8166. 98 indexed citations
11.
Venkataraman, Sujatha, Brett A. Wagner, Xiaohong Jiang, et al.. (2004). Overexpression of Manganese Superoxide Dismutase Promotes the Survival of Prostate Cancer Cells Exposed to Hyperthermia. Free Radical Research. 38(10). 1119–1132. 43 indexed citations
12.
Schäfer, Freya, et al.. (2003). Phospholipid Hydroperoxide Glutathione Peroxidase Induces a Delay in G1of the Cell Cycle. Free Radical Research. 37(6). 621–630. 31 indexed citations
13.
Schäfer, Freya, et al.. (2002). Comparing β-Carotene, Vitamin E and Nitric Oxide as Membrane Antioxidants. Biological Chemistry. 383(3-4). 671–81. 86 indexed citations
14.
Qian, Steven Y., et al.. (2000). EPR detection of lipid-derived free radicals from PUFA, LDL, and cell oxidations. Free Radical Biology and Medicine. 29(6). 568–579. 65 indexed citations
15.
Venkataraman, Sujatha, Sean M. Martin, Freya Schäfer, & Garry R. Buettner. (2000). Detailed methods for the quantification of nitric oxide in aqueous solutions using either an oxygen monitor or EPR. Free Radical Biology and Medicine. 29(6). 580–585. 57 indexed citations
16.
Buettner, Garry R. & Freya Schäfer. (2000). Free radicals, oxidants, and antioxidants. Teratology. 62(4). 234–234. 25 indexed citations
17.
Schäfer, Freya & Garry R. Buettner. (2000). Acidic pH amplifies iron-mediated lipid peroxidation in cells. Free Radical Biology and Medicine. 28(8). 1175–1181. 103 indexed citations
18.
Schäfer, Freya & Garry R. Buettner. (1999). Singlet Oxygen Toxicity Is Cell Line-dependent: A Study of Lipid Peroxidation in Nine Leukemia Cell Lines. Photochemistry and Photobiology. 70(6). 858–858. 2 indexed citations
19.
Schäfer, Freya, et al.. (1992). Determination of benzene metabolites in urine of mice by solid-phase extraction and high-performance liquid chromatography. Journal of Chromatography A. 593(1-2). 147–151. 21 indexed citations
20.
Kriváň, V. & Freya Schäfer. (1989). Surface deposits on spruce needles as a possible indicator for the degree of heavy metal pollution of the atmosphere. Fresenius Zeitschrift für Analytische Chemie. 333(7). 726–726. 2 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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