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

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.

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. profile →
Endocrine control of parturition

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

Peers

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

#	Work	Indexed citations
1	Changes in Placental CRH, Urocortins, and CRH-Receptor mRNA Expression Associated with Preterm Delivery and Chorioamnionitis 2010 ·The Journal of Clinical Endocrinology & Metabolism ·Michela Torricelli, Romina Novembri, Enrrico Bloise, (unknown), John Challis, Felice Petraglia	38
2	Maternal betamethasone administration reduces binucleate cell number and placental lactogen in sheep 2007 ·Journal of Endocrinology ·Thorsten Braun, Shaofu Li, Timothy J. M. Moss, John P. Newnham, John Challis, Peter D. Gluckman, Deborah M. Sloboda	51
3	Identification and Characterization of the Protein-associated Splicing Factor as a Negative Co-regulator of the Progesterone Receptor 2005 ·Journal of Biological Chemistry ·Xuesen Dong, (unknown), John Challis, Stephen J. Lye	65
4	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 2003 ·Journal of Biopharmaceutical Statistics ·Lyle C. Gurrin, Timothy J. M. Moss, Deborah M. Sloboda, Martin L. Hazelton, John Challis, John P. Newnham	6
5	Expression of Matrix Metalloproteinase (MMP)-2 and MMP-9 in Human Placenta and Fetal Membranes in Relation to Preterm and Term Labor 2002 ·The Journal of Clinical Endocrinology & Metabolism ·Ping Xu, Nadia Alfaidy, John Challis	207
6	Prostaglandins and Uterine Activity 2001 ·Frontiers of hormone research ·Falguni A. Patel, John Challis	28
7	Glucocorticoid actions and metabolism in pregnancy: Implications for placental function and fetal cardiovascular activity 1998 ·Placenta ·Kang Sun, Kaiping Yang, John Challis	29
8	The effect of estradiol on output of adrenocorticotropin and prolactin by fetal sheep anterior pituitary cells 1998 ·Canadian Journal of Physiology and Pharmacology ·(unknown), Stephen G. Matthews, Kaiping Yang, John Challis	8
9	Antenatal glucocorticoid administration increases corticotrophin‐releasing hormone in maternal plasma 1998 ·BJOG An International Journal of Obstetrics & Gynaecology ·(unknown), Di Yu, Mildred Ramírez, Emanuela Marinoni, Alan Bocking, John Challis	60
10	Cellular localization and developmental regulation of 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) gene expression in the ovine placenta 1997 ·Placenta ·Kaiping Yang, (unknown), (unknown), John Challis, (unknown), M. Yu	23
11	Differential regulation of proopiomelanocortin messenger ribonucleic acid in the pars distalis and pars intermedia of the pituitary gland after prolonged hypoxemia in fetal sheep. 1996 ·Endocrinology ·(unknown), Stephen G. Matthews, John Challis	21
12	Localisation of 15‐hydroxy prostaglandin dehydrogenase (PGDH) and steroidogenic enzymes in the equine placenta 1995 ·Equine Veterinary Journal ·Xiaojuan Han, P. D. ROSSDALE, JENNIFER C. OUSEY, N. B. Holdstock, W. R. Allen, M. Silver, Abigail L. Fowden, A. J. McGladdery, Fernand Labrie, A. Bèlanger, Mark Ensor, (unknown), John Challis	21
13	Changes in the Diurnal Rhythms of Plasma Cortisol in Women during the Third Trimester of Pregnancy 1983 ·Gynecologic and Obstetric Investigation ·John Challis, John Patrick	12
14	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 1983 ·Gynecologic and Obstetric Investigation ·John Challis, (unknown), John Patrick	21
15	Metabolism of [3H]oestrone sulphate by fetal membranes, placenta and uterine tissues from pregnant rabbits 1980 ·Reproduction ·John Challis, Ellen Greenblatt	1
16	Administration of extra-amniotic arachidonic acid and the suppression of uterine prostaglandin synthesis during pregnancy in the rhesus monkey 1978 ·Reproduction ·J. S. Robinson, Robert Chapman, John Challis, Murray D. Mitchell, G. D. Thorburn	18
17	Prostaglandins in the sheep fetus: implications for fetal function. 1978 ·Munich Personal RePEc Archive (Ludwig Maximilian University of Munich) ·John Challis, I. C. Hart, T. M. Louis, Murray D. Mitchell, G. Jenkin, J. S. Robinson, G. D. Thorburn	27
18	Control of parturition in subhuman primates. 1978 ·UWA Profiles and Research Repository (UWA) ·John Challis, (unknown)	7
19	Production of prostaglandin F by rabbit granulosa cells and thecal tissue 1977 ·Reproduction ·G. F. Erickson, John Challis, (unknown)	18
20	The effects of Nolvadex (tamoxifen citrate; ICI 46,474) on pregnancy in rabbits 1976 ·Reproduction ·B.J.A. Furr, B. Valcaccia, John Challis	20

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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