John Challis

19.3k total citations · 3 hit papers
360 papers, 15.4k citations indexed

About

John Challis is a scholar working on Pediatrics, Perinatology and Child Health, Pulmonary and Respiratory Medicine and Epidemiology. According to data from OpenAlex, John Challis has authored 360 papers receiving a total of 15.4k indexed citations (citations by other indexed papers that have themselves been cited), including 163 papers in Pediatrics, Perinatology and Child Health, 97 papers in Pulmonary and Respiratory Medicine and 79 papers in Epidemiology. Recurrent topics in John Challis's work include Birth, Development, and Health (144 papers), Neonatal Respiratory Health Research (87 papers) and Preterm Birth and Chorioamnionitis (76 papers). John Challis is often cited by papers focused on Birth, Development, and Health (144 papers), Neonatal Respiratory Health Research (87 papers) and Preterm Birth and Chorioamnionitis (76 papers). John Challis collaborates with scholars based in Canada, United States and United Kingdom. John Challis's co-authors include Stephen J. Lye, Stephen G. Matthews, William Gibb, G. D. Thorburn, A. N. Brooks, Felice Petraglia, Alan Bocking, Nadia Alfaidy, Falguni A. Patel and Kaiping Yang and has published in prestigious journals such as Nature, Science and New England Journal of Medicine.

In The Last Decade

John Challis

355 papers receiving 14.9k citations

Hit Papers

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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.

Endocrine and Paracrine Regulation of Birth at Term and Preterm*

2000 726 citations John Challis, Stephen G. Matthews et al. profile →
Inflammation and Pregnancy

2009 711 citations John Challis, Felice Petraglia et al. Reproductive Sciences profile →
Endocrine control of parturition

1979 355 citations G. D. Thorburn, John Challis profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author						Papers	Cites
John Challis	5.7k	3.8k	3.6k	3.3k	3.0k	360	15.4k
Peter W. Nathanielsz	11.2k 1.9×	1.8k 0.5×	5.1k 1.4×	2.2k 0.7×	2.9k 1.0×	633	20.8k
Stephen J. Lye	3.5k 0.6×	3.4k 0.9×	5.0k 1.4×	3.5k 1.1×	1.8k 0.6×	348	14.4k
Jerome F. Strauss	3.1k 0.5×	3.5k 0.9×	3.9k 1.1×	7.1k 2.1×	1.4k 0.5×	385	26.7k
Felice Petraglia	4.7k 0.8×	2.3k 0.6×	10.1k 2.8×	7.1k 2.1×	1.6k 0.5×	933	30.9k
Murray D. Mitchell	3.0k 0.5×	6.6k 1.7×	5.2k 1.5×	4.7k 1.4×	2.8k 1.0×	614	21.8k
Frank H. de Jong	2.5k 0.4×	1.0k 0.3×	852 0.2×	8.7k 2.6×	1.4k 0.5×	451	26.2k
Jane E. Norman	4.5k 0.8×	3.4k 0.9×	5.6k 1.6×	4.5k 1.4×	1.2k 0.4×	294	12.6k
Abigail L. Fowden	8.1k 1.4×	470 0.1×	5.0k 1.4×	1.0k 0.3×	1.5k 0.5×	236	13.3k
Petra Arck	1.5k 0.3×	1.1k 0.3×	2.9k 0.8×	3.1k 0.9×	559 0.2×	275	13.3k
Susan E. Ozanne	12.3k 2.2×	1.2k 0.3×	5.6k 1.6×	2.9k 0.9×	761 0.3×	311	19.9k

Countries citing papers authored by John Challis

Since Specialization

Citations

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

Fields of papers citing papers by John Challis

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of John Challis

This figure shows the co-authorship network connecting the top 25 collaborators of John Challis. A scholar is included among the top collaborators of John Challis 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 John Challis. John Challis 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

Braun, Thorsten, Deborah M. Sloboda, B. Tutschek, et al.. (2015). Fetal and neonatal outcomes after term and preterm delivery following betamethasone administration. International Journal of Gynecology & Obstetrics. 130(1). 64–69. 32 indexed citations

Torricelli, Michela, et al.. (2010). Changes in Placental CRH, Urocortins, and CRH-Receptor mRNA Expression Associated with Preterm Delivery and Chorioamnionitis. The Journal of Clinical Endocrinology & Metabolism. 96(2). 534–540. 38 indexed citations

Braun, Thorsten, Shaofu Li, Timothy J. M. Moss, et al.. (2007). Maternal betamethasone administration reduces binucleate cell number and placental lactogen in sheep. Journal of Endocrinology. 194(2). 337–347. 51 indexed citations

Watson, Carole, et al.. (2007). 15-Hydroxyprostaglandin Dehydrogenase Protein Expression in Human Fetal Membranes With and Without Subclinical Inflammation. Reproductive Sciences. 14(3). 260–269. 5 indexed citations

Dean, Heather & John Challis. (2006). The Developmental Origins of Health and Disease: Another Legacy From Your Grandmother. Canadian Journal of Diabetes. 30(1). 16–17.

Campbell, M. Karen, John Challis, Orlando daSilva, & Alan Bocking. (2005). A cohort study found that white blood cell count and endocrine markers predicted preterm birth in symptomatic women. Journal of Clinical Epidemiology. 58(3). 304–310. 26 indexed citations

Gurrin, Lyle C., Timothy J. M. Moss, Deborah M. Sloboda, et al.. (2003). Using WinBUGS to Fit Nonlinear Mixed Models with an Application to Pharmacokinetic Modelling of Insulin Response to Glucose Challenge in Sheep Exposed Antenatally to Glucocorticoids. Journal of Biopharmaceutical Statistics. 13(1). 117–139. 6 indexed citations

Xu, Ping, Nadia Alfaidy, & John Challis. (2002). Expression of Matrix Metalloproteinase (MMP)-2 and MMP-9 in Human Placenta and Fetal Membranes in Relation to Preterm and Term Labor. The Journal of Clinical Endocrinology & Metabolism. 87(3). 1353–1361. 207 indexed citations

Lye, Stephen J., et al.. (2000). Fetal-to-Maternal Progression of Prostaglandin H2 Synthase-2 Expression in Ovine Intrauterine Tissues During the Course of Labor1. Biology of Reproduction. 62(3). 797–805. 37 indexed citations

10.

Ramírez, Mildred, et al.. (1998). Maternal Corticotropin-Releasing Hormone Is Increased with Impending Preterm Birth. The Journal of Clinical Endocrinology & Metabolism. 83(5). 1585–1591. 129 indexed citations

11.

Matthews, Stephen G., et al.. (1996). Differential regulation of proopiomelanocortin messenger ribonucleic acid in the pars distalis and pars intermedia of the pituitary gland after prolonged hypoxemia in fetal sheep.. Endocrinology. 137(7). 2731–2738. 21 indexed citations

12.

Challis, John, et al.. (1989). Prostaglandin E2 metabolism in the human fetal membranes. American Journal of Obstetrics and Gynecology. 161(6). 1580–1585. 25 indexed citations

13.

Challis, John, et al.. (1983). Relation between Diurnal Changes in Peripheral Plasma Progesterone, Cortisol, and Estriol in Normal Women at 30–31, 34–35, and 38–39 Weeks of Gestation. Gynecologic and Obstetric Investigation. 16(1). 33–44. 21 indexed citations

14.

Challis, John & John Patrick. (1983). Changes in the Diurnal Rhythms of Plasma Cortisol in Women during the Third Trimester of Pregnancy. Gynecologic and Obstetric Investigation. 16(1). 27–32. 12 indexed citations

15.

Challis, John & Ellen Greenblatt. (1980). Metabolism of [3H]oestrone sulphate by fetal membranes, placenta and uterine tissues from pregnant rabbits. Reproduction. 58(1). 13–18. 1 indexed citations

16.

Robinson, J. S., Robert Chapman, John Challis, Murray D. Mitchell, & G. D. Thorburn. (1978). Administration of extra-amniotic arachidonic acid and the suppression of uterine prostaglandin synthesis during pregnancy in the rhesus monkey. Reproduction. 54(2). 369–373. 18 indexed citations

17.

Challis, John, I. C. Hart, T. M. Louis, et al.. (1978). Prostaglandins in the sheep fetus: implications for fetal function.. Munich Personal RePEc Archive (Ludwig Maximilian University of Munich). 4. 115–32. 27 indexed citations

18.

Challis, John, et al.. (1978). Control of parturition in subhuman primates.. UWA Profiles and Research Repository (UWA). 2(3). 247–60. 7 indexed citations

19.

Erickson, G. F., et al.. (1977). Production of prostaglandin F by rabbit granulosa cells and thecal tissue. Reproduction. 49(1). 133–134. 18 indexed citations

20.

Furr, B.J.A., B. Valcaccia, & John Challis. (1976). The effects of Nolvadex (tamoxifen citrate; ICI 46,474) on pregnancy in rabbits. Reproduction. 48(2). 367–369. 20 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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