William H. Okamura

6.1k total citations · 1 hit paper
130 papers, 4.9k citations indexed

About

William H. Okamura is a scholar working on Organic Chemistry, Pathology and Forensic Medicine and Cell Biology. According to data from OpenAlex, William H. Okamura has authored 130 papers receiving a total of 4.9k indexed citations (citations by other indexed papers that have themselves been cited), including 63 papers in Organic Chemistry, 61 papers in Pathology and Forensic Medicine and 25 papers in Cell Biology. Recurrent topics in William H. Okamura's work include Vitamin D Research Studies (61 papers), Estrogen and related hormone effects (23 papers) and Biotin and Related Studies (22 papers). William H. Okamura is often cited by papers focused on Vitamin D Research Studies (61 papers), Estrogen and related hormone effects (23 papers) and Biotin and Related Studies (22 papers). William H. Okamura collaborates with scholars based in United States, Belgium and Japan. William H. Okamura's co-authors include Anthony W. Norman, R. Bouillon, Gui‐Dong Zhu, June E. Bishop, Richard M. Wing, Michael L. Curtin, Hang Shi, Michael B. Zemel, Anindita Sen and Wolfgang Reischl and has published in prestigious journals such as Science, Chemical Reviews and Proceedings of the National Academy of Sciences.

In The Last Decade

William H. Okamura

130 papers receiving 4.7k 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.

Structure-Function Relationships in the Vitamin D Endocrine System*

1995 1.0k citations R. Bouillon, William H. Okamura et al. Endocrine Reviews profile →

Peers

William H. Okamura

PFM

GENET

Sachiko Yamada Japan

Khalil Ahmed United States

Guy Leclercq Belgium

Andrzej Kutner Poland

Maurice M. Pechet United States

Yoshio Ban Japan

Hideko Nagasawa Japan

Jeffrey A. Dodge United States

Nicholas R. Bachur United States

Bryce V. Plapp United States

Sachiko Yamada Japan

William H. Okamura

1.9k ×0.8

PFM

957 ×0.5

1.1k ×1.0

889 ×0.8

GENET

556 ×0.8

Citations per year, relative to William H. Okamura William H. Okamura (= 1×) peers Sachiko Yamada

Countries citing papers authored by William H. Okamura

Since Specialization

Citations

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

Fields of papers citing papers by William H. Okamura

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by William H. Okamura. 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 William H. Okamura. The network helps show where William H. Okamura may publish in the future.

Co-authorship network of co-authors of William H. Okamura

This figure shows the co-authorship network connecting the top 25 collaborators of William H. Okamura. A scholar is included among the top collaborators of William H. Okamura 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 William H. Okamura. William H. Okamura 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

Norman, Anthony W., June E. Bishop, Craig M. Bula, et al.. (2002). Molecular tools for study of genomic and rapid signal transduction responses initiated by 1α,25(OH)2-vitamin D3. Steroids. 67(6). 457–466. 58 indexed citations

Norman, Anthony W., William H. Okamura, June E. Bishop, & Helen L. Henry. (2002). Update on biological actions of 1α,25(OH)2-vitamin D3 (rapid effects) and 24R,25(OH)2-vitamin D3. Molecular and Cellular Endocrinology. 197(1-2). 1–13. 82 indexed citations

Norman, Anthony W., et al.. (2001). Different shapes of the steroid hormone 1α,25(OH)2-vitamin D3 act as agonists for two different receptors in the vitamin D endocrine system to mediate genomic and rapid responses☆11☆ Guest Editor: Dr. Satya Reddy, Proceedings of the First International Conference on Chemistry and Biology of Vitamin D Analogs, Brown University, Providence, RI.. Steroids. 66(3-5). 147–158. 53 indexed citations

Reddy, G. Satyanarayana, Krishnamurthi Muralidharan, William H. Okamura, Kou‐Yi Tserng, & John A. McLane. (2001). Metabolism of 1α,25-dihydroxyvitamin D3 and its C-3 epimer 1α,25-dihydroxy-3-epi-vitamin D3 in neonatal human keratinocytes. Steroids. 66(3-5). 441–450. 55 indexed citations

Muralidharan, Krishnamurthi, et al.. (1997). Inhibitors of 25-hydroxyvitamin D3-1α-hydroxylase: Thiavitamin D analogs and biological evaluation. The Journal of Steroid Biochemistry and Molecular Biology. 62(1). 73–78. 2 indexed citations

Norman, Anthony W., June E. Bishop, Elaine D. Collins, et al.. (1996). Differing shapes of 1α,25-dihydroxyvitamin D3 function as ligands for the D-binding protein, nuclear receptor and membrane receptor: A status report. The Journal of Steroid Biochemistry and Molecular Biology. 56(1-6). 13–22. 51 indexed citations

Okamura, William H., et al.. (1995). Biochemical Significance of the 6‐s‐cis Conformation of the Steroid Hormone lα,25‐Dihydroxyvitamin D₃ Based on the Provitamin D Skeletona. Annals of the New York Academy of Sciences. 761(1). 344–348. 11 indexed citations

Bouillon, R., William H. Okamura, & Anthony W. Norman. (1995). Structure-Function Relationships in the Vitamin D Endocrine System*. Endocrine Reviews. 16(2). 200–257. 1018 indexed citations breakdown →

Okamura, William H., M. Mark Midland, Noorsaadah Abd Rahman, et al.. (1995). Chemistry and conformation of vitamin D molecules. The Journal of Steroid Biochemistry and Molecular Biology. 53(1-6). 603–613. 73 indexed citations

10.

Zhu, Gui‐Dong & William H. Okamura. (1995). Synthesis of Vitamin D (Calciferol). Chemical Reviews. 95(6). 1877–1952. 271 indexed citations

11.

Norman, Anthony W., et al.. (1994). 14-Epi Stereoisomers of 25-Hydroxy- and 1.alpha.,25-Dihydroxyvitamin D3: Synthesis, Isomerization to Previtamins, and Biological Studies. Journal of Medicinal Chemistry. 37(15). 2387–2393. 34 indexed citations

12.

Okamura, William H., J. Antonio Palenzuela, Joaquı́n Plumet, & M. Mark Midland. (1992). Vitamin D: Structure‐function analyses and the design of analogs. Journal of Cellular Biochemistry. 49(1). 10–18. 48 indexed citations

13.

Norman, Anthony W., Ilka Nemere, Krishnamurthi Muralidharan, & William H. Okamura. (1992). 1β, 25(OH)2-vitamin D3 is an antagonist of 1α,25(OH)2-vitamin D3 stimulated transcaltachia (The rapid hormonal stimulation of intestinal calcium transport). Biochemical and Biophysical Research Communications. 189(3). 1450–1456. 40 indexed citations

14.

Craig, Andrew S., Anthony W. Norman, & William H. Okamura. (1992). Studies of vitamin D (calciferol) and its analogs. 43. Two novel allenic side chain analogs of 1.alpha.,25-dihydroxyvitamin D3. The Journal of Organic Chemistry. 57(16). 4374–4380. 20 indexed citations

15.

Henry, Helen L., et al.. (1991). Effect of three A-ring analogs of 1α,25-dihydroxyvitamin D3 on 25-OH-D3-1α-hydroxylase in isolated mitochondria and on 25-hydroxyvitamin D3 metabolism in cultured kidney cells. The Journal of Steroid Biochemistry and Molecular Biology. 38(6). 775–779. 4 indexed citations

16.

Okamura, William H., et al.. (1987). On the stereospecific reduction of vinylsulfoxides with thepossibility of deuterium labeling. Tetrahedron Letters. 28(52). 6565–6568. 12 indexed citations

17.

Okamura, William H., et al.. (1986). Studies on vitamin D (calciferol) and its analogs. 29. Mechanistic studies by deuterium labeling and related kinetic investigations of the [1,5]-sigmatropic hydrogen shift of vitamin D type vinylallenes. The Journal of Organic Chemistry. 51(16). 3201–3206. 16 indexed citations

18.

Okamura, William H., et al.. (1982). Studies on vitamin D (calciferol) and its analogs. 24. Heterocalciferols: novel 3-thia and 3-sulfinyl analogs of 1.alpha.-hydroxyvitamin D3. Journal of the American Chemical Society. 104(22). 6105–6109. 6 indexed citations

19.

Gerdes, John M., Anthony W. Norman, & William H. Okamura. (1981). Studies on vitamin D (calciferol) and its analogs. 21. Solvolytic ring expansions of vitamin D3. Formation of 1,4-dihydroxy-A-homo-19-nor-9,10-secocholesta-5,7-diene. The Journal of Organic Chemistry. 46(3). 599–602. 4 indexed citations

20.

Hammond, Milton L., et al.. (1980). Studies on vitamin D (calciferol) and its analogs. 18. The vinylallene approach to the 1-hydroxyvitamin D system. New sigmatropic reactions in the vitamin D series. Journal of the American Chemical Society. 102(20). 6259–6267. 25 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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