Karin Hammer‐Jespersen

810 total citations
19 papers, 725 citations indexed

About

Karin Hammer‐Jespersen is a scholar working on Molecular Biology, Physiology and Materials Chemistry. According to data from OpenAlex, Karin Hammer‐Jespersen has authored 19 papers receiving a total of 725 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Molecular Biology, 5 papers in Physiology and 4 papers in Materials Chemistry. Recurrent topics in Karin Hammer‐Jespersen's work include Biochemical and Molecular Research (14 papers), Adenosine and Purinergic Signaling (5 papers) and Enzyme function and inhibition (4 papers). Karin Hammer‐Jespersen is often cited by papers focused on Biochemical and Molecular Research (14 papers), Adenosine and Purinergic Signaling (5 papers) and Enzyme function and inhibition (4 papers). Karin Hammer‐Jespersen collaborates with scholars based in Denmark and Tanzania. Karin Hammer‐Jespersen's co-authors include Agnete Munch‐Petersen, Marianne Schwartz, Per Nygaard, Roger S. Buxton, Poul Valentin‐Hansen, Ib Svendsen, P. Valentin‐Hansen, Jytte Josephsen and Niels P. Fiil and has published in prestigious journals such as The EMBO Journal, Journal of Molecular Biology and Biochemistry.

In The Last Decade

Karin Hammer‐Jespersen

19 papers receiving 604 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Karin Hammer‐Jespersen Denmark 15 667 212 146 94 87 19 725
Robert S. Sarfati France 17 551 0.8× 141 0.7× 115 0.8× 35 0.4× 26 0.3× 32 709
P. Valentin‐Hansen Denmark 19 697 1.0× 557 2.6× 68 0.5× 138 1.5× 13 0.1× 22 805
Shimei Gong United States 12 360 0.5× 240 1.1× 30 0.2× 46 0.5× 15 0.2× 12 649
Lucy Vandeputte-Rutten Netherlands 9 347 0.5× 185 0.9× 40 0.3× 38 0.4× 14 0.2× 9 654
Sally E. Jorgensen United States 9 373 0.6× 178 0.8× 54 0.4× 130 1.4× 8 0.1× 12 520
Christine Munger Canada 12 408 0.6× 83 0.4× 84 0.6× 71 0.8× 17 0.2× 12 649
K.R. Rajashankar United States 8 413 0.6× 94 0.4× 119 0.8× 21 0.2× 6 0.1× 10 618
A J Ferro United States 12 312 0.5× 25 0.1× 39 0.3× 30 0.3× 29 0.3× 20 387
Arnthór Aevarsson Iceland 11 792 1.2× 185 0.9× 184 1.3× 103 1.1× 4 0.0× 23 1.1k
Myriam M. Altamirano Mexico 14 514 0.8× 95 0.4× 237 1.6× 33 0.4× 6 0.1× 22 753

Countries citing papers authored by Karin Hammer‐Jespersen

Since Specialization
Citations

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

Fields of papers citing papers by Karin Hammer‐Jespersen

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Karin Hammer‐Jespersen. 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 Karin Hammer‐Jespersen. The network helps show where Karin Hammer‐Jespersen may publish in the future.

Co-authorship network of co-authors of Karin Hammer‐Jespersen

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

All Works

19 of 19 papers shown
1.
Valentin‐Hansen, P., et al.. (1984). Structure and function of the intercistronic regulatory deoC-deoA element of Escherichia coli K-12.. The EMBO Journal. 3(1). 179–183. 30 indexed citations
2.
Josephsen, Jytte, et al.. (1983). Mapping of the gene for cytidine deaminase (cdd) in Escherichia coli K-12. Journal of Bacteriology. 154(1). 72–75. 10 indexed citations
3.
Valentin‐Hansen, Poul, et al.. (1982). The Primary Structure of Escherichia coli K12 2‐Deoxyribose 5‐Phosphate Aldolase. European Journal of Biochemistry. 125(3). 561–566. 43 indexed citations
4.
Josephsen, Jytte & Karin Hammer‐Jespersen. (1981). Fusion of the lac genes to the promotor for the cytidine deaminase gene of Escherichia coli K-12. Molecular and General Genetics MGG. 182(1). 154–158. 11 indexed citations
5.
Hammer‐Jespersen, Karin, et al.. (1980). A second purine nucleoside phosphorylase in Escherichia coli K-12. Molecular and General Genetics MGG. 179(2). 341–348. 35 indexed citations
6.
Buxton, Roger S., Karin Hammer‐Jespersen, & P. Valentin‐Hansen. (1980). A second purine nucleoside phosphorylase in Escherichia coli K-12. Molecular and General Genetics MGG. 179(2). 331–340. 22 indexed citations
7.
Valentin‐Hansen, Poul, Karin Hammer‐Jespersen, & Roger S. Buxton. (1979). Evidence for the existence of three promoters for the deo operon of Escherichia coli K12 in vitro. Journal of Molecular Biology. 133(1). 1–17. 14 indexed citations
8.
Buxton, Roger S., et al.. (1978). Insertion of bacteriophage lambda into the deo operon of Escherichia coli K-12 and isolation of plaque-forming lambdadeo+ transducing bacteriophages. Journal of Bacteriology. 136(2). 668–681. 21 indexed citations
9.
Valentin‐Hansen, Poul, et al.. (1978). Regulation of the deo operon in Escherichia coli. Molecular and General Genetics MGG. 159(2). 191–202. 71 indexed citations
10.
Buxton, Roger S., et al.. (1977). Overlapping transcriptional units in the deo operon of Escherichia coli K-12. Journal of Molecular Biology. 114(3). 287–300. 23 indexed citations
11.
Hammer‐Jespersen, Karin, et al.. (1977). Uridine Phosphorylase from Escherichia coli. Physical and Chemical Characterization. European Journal of Biochemistry. 75(1). 217–224. 93 indexed citations
12.
Hammer‐Jespersen, Karin & Per Nygaard. (1976). Multiple regulation of nucleoside catabolizing enzymes in Escherichia coli: Effects of 3:5′ cyclic AMP and CRP protein. Molecular and General Genetics MGG. 148(1). 49–55. 21 indexed citations
13.
Hammer‐Jespersen, Karin, et al.. (1976). Multiple regulation of nucleoside catabolizing enzymes: Effects of a polar dra mutation on the deo enzymes. Molecular and General Genetics MGG. 146(2). 139–145. 21 indexed citations
14.
Hammer‐Jespersen, Karin, et al.. (1975). Multiple forms of phosphodeoxyribomutase from Escherichia coli. Physical and chemical characterization. Biochemistry. 14(3). 599–607. 14 indexed citations
15.
Hammer‐Jespersen, Karin & Agnete Munch‐Petersen. (1975). Multiple regulation of nucleoside catabolizing enzymes: Regulation of thedeo operon by thecytR anddeoR gene products. Molecular and General Genetics MGG. 137(4). 327–335. 54 indexed citations
16.
Hammer‐Jespersen, Karin & Agnete Munch‐Petersen. (1973). Mutants of Escherichia coli unable to metabolize cytidine: Isolation and characterization. Molecular and General Genetics MGG. 126(2). 177–186. 38 indexed citations
17.
Munch‐Petersen, Agnete, et al.. (1972). Mutants Constitutive for Nucleoside-Catabolizing Enzymes in Escherichia coli K 12. Isolation, Characterization and Mapping. European Journal of Biochemistry. 27(2). 208–215. 65 indexed citations
18.
Hammer‐Jespersen, Karin, Agnete Munch‐Petersen, Per Nygaard, & Marianne Schwartz. (1971). Induction of Enzymes Involved in the Catabolism of Deoxyribonucleosides and Ribonucleosides in Escherichia coli K 12. European Journal of Biochemistry. 19(4). 533–538. 91 indexed citations
19.
Hammer‐Jespersen, Karin, et al.. (1970). Phosphodeoxyribomutase from Escherichia coli. European Journal of Biochemistry. 17(3). 397–407. 48 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 Robert S. Sarfati Breakdown of academic impact, for papers by P. Valentin‐Hansen Breakdown of academic impact, for papers by Shimei Gong Breakdown of academic impact, for papers by Lucy Vandeputte-Rutten Breakdown of academic impact, for papers by Sally E. Jorgensen Breakdown of academic impact, for papers by Christine Munger Breakdown of academic impact, for papers by K.R. Rajashankar Breakdown of academic impact, for papers by A J Ferro Breakdown of academic impact, for papers by Arnthór Aevarsson Breakdown of academic impact, for papers by Myriam M. Altamirano
Rankless by CCL
2026