Richard M. Halpern

1.3k total citations
30 papers, 1.1k citations indexed

About

Richard M. Halpern is a scholar working on Molecular Biology, Oncology and Clinical Biochemistry. According to data from OpenAlex, Richard M. Halpern has authored 30 papers receiving a total of 1.1k indexed citations (citations by other indexed papers that have themselves been cited), including 22 papers in Molecular Biology, 6 papers in Oncology and 4 papers in Clinical Biochemistry. Recurrent topics in Richard M. Halpern's work include Biochemical and Molecular Research (5 papers), Amino Acid Enzymes and Metabolism (4 papers) and Metabolism and Genetic Disorders (4 papers). Richard M. Halpern is often cited by papers focused on Biochemical and Molecular Research (5 papers), Amino Acid Enzymes and Metabolism (4 papers) and Metabolism and Genetic Disorders (4 papers). Richard M. Halpern collaborates with scholars based in United States. Richard M. Halpern's co-authors include Roberts A. Smith, B. Halpern, Brian R. Clark, Dorothy Hardy, Donald L. Smith, Hilary L. Ashe, Donald L. Smith, Baldassarre Stea, Yuan-Ching Lin and Fred C. Chu and has published in prestigious journals such as Nature, Proceedings of the National Academy of Sciences and Biochemistry.

In The Last Decade

Richard M. Halpern

30 papers receiving 1.0k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Richard M. Halpern United States 18 717 161 157 148 144 30 1.1k
William C. Werkheiser United States 14 779 1.1× 167 1.0× 70 0.4× 122 0.8× 62 0.4× 24 1.2k
Carl Kutzbach Germany 12 670 0.9× 72 0.4× 135 0.9× 222 1.5× 47 0.3× 16 1.2k
Sam Sorof United States 20 639 0.9× 321 2.0× 86 0.5× 77 0.5× 62 0.4× 54 1.2k
Shinsei Gasa Japan 21 754 1.1× 86 0.5× 72 0.5× 40 0.3× 61 0.4× 81 1.2k
Sigmund F. Zakrzewski United States 18 659 0.9× 192 1.2× 85 0.5× 37 0.3× 20 0.1× 43 1.0k
J. C. Madelmont France 15 436 0.6× 123 0.8× 83 0.5× 16 0.1× 88 0.6× 53 800
Joseph I. DeGraw United States 19 560 0.8× 211 1.3× 51 0.3× 30 0.2× 19 0.1× 108 1.4k
Noboru Nakai Japan 10 406 0.6× 147 0.9× 73 0.5× 22 0.1× 31 0.2× 19 784
A. H. Blair Canada 18 468 0.7× 154 1.0× 117 0.7× 34 0.2× 45 0.3× 31 1.1k
P. G. Munder Germany 20 931 1.3× 180 1.1× 195 1.2× 37 0.3× 15 0.1× 52 1.4k

Countries citing papers authored by Richard M. Halpern

Since Specialization
Citations

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

Fields of papers citing papers by Richard M. Halpern

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Richard M. Halpern. 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 Richard M. Halpern. The network helps show where Richard M. Halpern may publish in the future.

Co-authorship network of co-authors of Richard M. Halpern

This figure shows the co-authorship network connecting the top 25 collaborators of Richard M. Halpern. A scholar is included among the top collaborators of Richard M. Halpern 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 Richard M. Halpern. Richard M. Halpern 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.
Halpern, Richard M., et al.. (1981). Urinary excretion levels of unconjugated pterins in cancer patients and normal individuals. Clinica Chimica Acta. 113(3). 231–242. 56 indexed citations
2.
Halpern, Richard M., et al.. (1980). Quantitative determination of pterins in biological fluids by high-performance liquid chromatography. Journal of Chromatography A. 188(2). 363–375. 39 indexed citations
3.
Stea, Baldassarre, Richard M. Halpern, & Roberts A. Smith. (1979). Separation of unconjugated pteridines by high-pressure cation-exchange liquid chromatography. Journal of Chromatography A. 168(2). 385–393. 31 indexed citations
4.
Stea, Baldassarre, Peter S. Backlund, Arthur K. Cho, et al.. (1978). Folate and pterin metabolism by cancer cells in culture.. PubMed. 38(8). 2378–84. 46 indexed citations
5.
Smith, Roberts A., et al.. (1978). Chapter 15. Chromosomal Protein Phosphorylation on Basic Amino Acids. Methods in cell biology. 19. 153–159. 22 indexed citations
6.
Lin, Yuan-Ching, et al.. (1977). Phosphorylation of nuclear proteins in rat regenerating liver. Biochemistry. 16(22). 4852–4855. 73 indexed citations
7.
Halpern, Richard M., B. Halpern, Brian R. Clark, et al.. (1975). New approach to antifolate treatment of certain cancers as demonstrated in tissue culture.. Proceedings of the National Academy of Sciences. 72(10). 4018–4022. 11 indexed citations
8.
Halpern, B., Robert M. Ezzell, Dorothy Hardy, et al.. (1975). Effect of methionine replacement by homocystine in cultures containing both malignant rat breast carcinosarcoma (walker-256) cells and normal adult rat liver fibroblasts. In Vitro Cellular & Developmental Biology - Plant. 11(1). 14–19. 9 indexed citations
9.
Clark, Brian R., Hilary L. Ashe, Richard M. Halpern, & Roberts A. Smith. (1974). A method for determination of methionine containing radioactivity in the thiomethyl moiety. Analytical Biochemistry. 61(1). 243–247. 17 indexed citations
10.
Smith, Donald L., et al.. (1974). Occurrence and distribution of acid-labile histone phosphates in regenerating rat liver. Biochemistry. 13(18). 3785–3789. 114 indexed citations
11.
Halpern, B., Brian R. Clark, Dorothy Hardy, Richard M. Halpern, & Roberts A. Smith. (1974). The Effect of Replacement of Methionine by Homocystine on Survival of Malignant and Normal Adult Mammalian Cells in Culture. Proceedings of the National Academy of Sciences. 71(4). 1133–1136. 172 indexed citations
12.
Ashe, Hilary L., Brian R. Clark, Fred C. Chu, et al.. (1974). N5-methyltetrahydrofolate: Homocysteine methyltransferase activity in extracts from normal, malignant and embryonic tissue culture cells. Biochemical and Biophysical Research Communications. 57(2). 417–425. 65 indexed citations
13.
Streeter, David, et al.. (1972). Inhibition of transfer ribonucleic acid methylase activity from several human tumors by nicotinamide and nicotinamide analogs. Biochemistry. 11(3). 393–397. 25 indexed citations
14.
Halpern, Richard M., et al.. (1971). Nicotinamide: A natural inhibitor of tRNA methylase. Biochemical and Biophysical Research Communications. 42(4). 602–607. 42 indexed citations
15.
Pritchard, David G., Richard M. Halpern, & Roberts A. Smith. (1971). Mucopolysaccharide contamination of DNA prepared by the aqueous polymer two-phase procedure. Biochimica et Biophysica Acta (BBA) - Nucleic Acids and Protein Synthesis. 228(1). 127–134. 4 indexed citations
16.
Halpern, B., et al.. (1970). Transfer RNA methylase inhibitors in neoplastic and normal rat tissue. Biochemical and Biophysical Research Communications. 40(5). 1209–1215. 19 indexed citations
17.
Collins, Michael, et al.. (1970). DNA polymerase activities in fractionated walker-256 tumor cell nuclei. Biochemical and Biophysical Research Communications. 40(5). 1201–1208. 6 indexed citations
18.
Halpern, B., et al.. (1970). Reversal of Malignant Transformation by Tumor DNA. Proceedings of the National Academy of Sciences. 67(4). 1827–1833. 6 indexed citations
19.
Halpern, Richard M., B. Halpern, K.A. Conklin, & Roberts A. Smith. (1968). Inhibition of neoplastic cell growth by autogenous DNA.. Proceedings of the National Academy of Sciences. 61(1). 207–214. 6 indexed citations
20.
Halpern, Richard M., B. Halpern, G Ciliv, & Roberts A. Smith. (1966). Inhibition of tumor transplantation by DNA. Biochemical and Biophysical Research Communications. 24(4). 559–563. 8 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 William C. Werkheiser Breakdown of academic impact, for papers by Carl Kutzbach Breakdown of academic impact, for papers by Sam Sorof Breakdown of academic impact, for papers by Shinsei Gasa Breakdown of academic impact, for papers by Sigmund F. Zakrzewski Breakdown of academic impact, for papers by J. C. Madelmont Breakdown of academic impact, for papers by Joseph I. DeGraw Breakdown of academic impact, for papers by Noboru Nakai Breakdown of academic impact, for papers by A. H. Blair Breakdown of academic impact, for papers by P. G. Munder
Rankless by CCL
2026