Ulrich Frei

15.2k total citations · 4 hit papers
242 papers, 11.4k citations indexed

About

Ulrich Frei is a scholar working on Surgery, Transplantation and Nephrology. According to data from OpenAlex, Ulrich Frei has authored 242 papers receiving a total of 11.4k indexed citations (citations by other indexed papers that have themselves been cited), including 77 papers in Surgery, 74 papers in Transplantation and 50 papers in Nephrology. Recurrent topics in Ulrich Frei's work include Renal Transplantation Outcomes and Treatments (73 papers), Organ Transplantation Techniques and Outcomes (47 papers) and Dialysis and Renal Disease Management (29 papers). Ulrich Frei is often cited by papers focused on Renal Transplantation Outcomes and Treatments (73 papers), Organ Transplantation Techniques and Outcomes (47 papers) and Dialysis and Renal Disease Management (29 papers). Ulrich Frei collaborates with scholars based in Germany, United States and Switzerland. Ulrich Frei's co-authors include Kai‐Uwe Eckardt, Michael S. Wiesener, Christian Rosenberger, Henrik Ekberg, Ralf Schindler, Achim Jörres, Pierre Daloze, Š Vı́tko, A. Demirbaş and Christian Hugo and has published in prestigious journals such as New England Journal of Medicine, Journal of Clinical Investigation and Blood.

In The Last Decade

Ulrich Frei

232 papers receiving 11.1k citations

Hit Papers

align trajectories

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.

Reduced Exposure to Calcineurin Inhibitors in Renal Transplantation

2007 1.4k citations Henrik Ekberg, Ulrich Frei et al. profile →
Widespread, hypoxia‐inducible expression of HIF‐2α in distinct cell populations of different organs

2002 582 citations Michael S. Wiesener, Christian Rosenberger et al. The FASEB Journal profile →
Expression of Hypoxia-Inducible Factor-1α and -2α in Hypoxic and Ischemic Rat Kidneys

2002 480 citations Christian Rosenberger, Stefano J. Mandriota et al. Journal of the American Society of Nephrology profile →
Two Novel Equations to Estimate Kidney Function in Persons Aged 70 Years or Older

2012 419 citations Ulrich Frei et al. profile →

Peers

Countries citing papers authored by Ulrich Frei

Since Specialization

Citations

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

Fields of papers citing papers by Ulrich Frei

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ulrich Frei

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

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	Thrombin activity throughout the acute phase of acute ST-elevation myocardial infarction and the relation to outcome 2009 ·Biomarkers ·(unknown), (unknown), J. Vollert, Günther Heller, (unknown), Hanno Riess, Christian Müller, Ulrich Frei, Martin Möckel	10
2	Activation of hypoxia-inducible factors ameliorates hypoxic distal tubular injury in the isolated perfused rat kidney 2008 ·Nephrology Dialysis Transplantation ·Christian Rosenberger, Seymour Rosen, Ahuva Shina, Ulrich Frei, Kai‐Uwe Eckardt, Lee A. Flippin, Michael Arend, S J Klaus, Samuel N. Heyman	73
3	Acute renal haemodynamic effects of radiocontrast media in patients undergoing left ventricular and coronary angiography 2008 ·Nephrology Dialysis Transplantation ·Martin Möckel, Milan Radović, York Kühnle, (unknown), (unknown), (unknown), Rainer Dietz, Ulrich Frei, Kai‐Uwe Eckardt	18
4	Exploring the Differences in Epidemiology of Treated ESRD Between Germany and England and Wales 2006 ·American Journal of Kidney Diseases ·Fergus Caskey, (unknown), Paul Roderick, Günter Edenharter, David Ansell, Ulrich Frei, Terry Feest	43
5	Differentiating the functional role of hypoxia‐inducible factor (HIF)‐1α and HIF‐2α (EPAS‐1) by the use of RNA interference: erythropoietin is a HIF‐2α target gene in Hep3B and Kelly cells 2004 ·The FASEB Journal ·Christina Warnecke, Zaneta Zaborowska, Jens Kurreck, Volker A. Erdmann, Ulrich Frei, Michael S. Wiesener, Kai‐Uwe Eckardt	336
6	Cellular responses to hypoxia after renal segmental infarction 2003 ·Kidney International ·Christian Rosenberger, Wanja Griethe, (unknown), Michael S. Wiesener, Ulrich Frei, Sebastian Bachmann, Kai‐Uwe Eckardt	96
7	Old-for-Old Kidney Allocation Allows Successful Expansion of the Donor and Recipient Pool 2003 ·American Journal of Transplantation ·Lutz Fritsche, Jan Hörstrup, Klemens Budde, Petra Reinke, Markus Giessing, Stefan G. Tullius, Stefan A. Loening, P. Neuhaus, Hans‐Hellmut Neumayer, Ulrich Frei	99
8	European Best Practice Guidelines for Renal Transplantation (Part 2). 2002 ·Lund University Publications (Lund University) ·F. Berthoux, Daniel Abramovicz, Henrik Ekberg, Ulrich Frei, (unknown), Klaus Ølgaard, Lorna Paul, (unknown)	318
9	Expression of Hypoxia-Inducible Factor-1α and -2α in Hypoxic and Ischemic Rat Kidneys breakdown → 2002 ·Journal of the American Society of Nephrology ·Christian Rosenberger, Stefano J. Mandriota, (unknown), Michael S. Wiesener, (unknown), Ulrich Frei, Peter J. Ratcliffe, Patrick H. Maxwell, Sebastian Bachmann, Kai‐Uwe Eckardt	480
10	IL-17 Stimulates Intraperitoneal Neutrophil Infiltration Through the Release of GROα Chemokine from Mesothelial Cells 2000 ·The Journal of Immunology ·Janusz Witowski, Krzysztof Pawlaczyk, Andrzej Bręborowicz, (unknown), Małgorzata Kużlan-Pawlaczyk, Justyna Wiśniewska, Alicja Połubińska, Helmut Friess, Gerhard M. Gahl, Ulrich Frei, Achim Jörres	266
11	Reversibility of hepatorenal syndrome in an anuric patient with Child C cirrhosis requiring haemodialysis for 7 weeks 2000 ·Nephrology Dialysis Transplantation ·Kai‐Uwe Eckardt, Ulrich Frei	4
12	Plasma cortisol levels before and during "low-dose" hydrocortisone therapy and their relationship to hemodynamic improvement in patients with septic shock 2000 ·Intensive Care Medicine ·Michael Oppert, (unknown), Klaus-Jürgen Gräf, D. Barckow, Ulrich Frei, Kai‐Uwe Eckardt	81
13	Prophylactic use of low‐dose urodilatin for prevention of renal impairment following liver transplantation: a randomized placebo‐controlled study 1997 ·Clinical Transplantation ·Jan M. Langrehr, Andreas Kahl, Markus Meyer, Ulf Neumann, M. Knoop, Sven Jonas, (unknown), Wolf O. Bechstein, Ulrich Frei, Wolf‐Georg Forssmann, (unknown)	14
14	Accelerated life testing of solar energy materials: Case study of some selective solar absorber coating materials for DHW systems. A report of task 10 solar materials research and development 1994 ·NASA STI/Recon Technical Report N ·Bo Carlsson, Michael Koehl, Ulrich Frei, (unknown)	5
15	Total Hepatectomy and Liver Transplantation as Two-stage Procedure 1993 ·Annals of Surgery ·B. Ringe, (unknown), Ernst R. Kuse, Ulrich Frei, R. Pichlmayr	125
16	Disseminated tuberculosis after renal transplantation 1990 ·Transplant International ·(unknown), Sandra Merscher, (unknown), Christian Feddersen, Ulrich Frei, R. Pichlmayr, (unknown)	7
17	Erythropoietin in polycystic kidneys. 1989 ·Journal of Clinical Investigation ·Kai‐Uwe Eckardt, (unknown), R. Neumann, R. Brunkhorst, Harold Burger, Gerhard Lonnemann, (unknown), G Keusch, Bjoern Buchholz, Ulrich Frei	91
18	Gastrointestinal Blood Loss in Haemodialysis Patients During Use of a Low-molecular-weight Heparinoid Anticoagulant 1988 ·Nephrology Dialysis Transplantation ·Ulrich Frei, Mark Wilks, Susan Boehmer, (unknown), (unknown), (unknown), (unknown)	12
19	[Recurrent hyperparathyroidism following subtotal parathyroidectomy]. 1978 ·Munich Personal RePEc Archive (Ludwig Maximilian University of Munich) ·I. Klempa, Ulrich Frei, (unknown), Koch Km	1
20	[Morphological aspects of parathyroid gland transplantation. Contribution on the clinical relevance of induced, invasive tissue growth]. 1978 ·Munich Personal RePEc Archive (Ludwig Maximilian University of Munich) ·I. Klempa, (unknown), Ulrich Frei, Koch Km, (unknown), (unknown)	3

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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