John O’Brien

14.6k citations

179 papers · 11.1k indexed · 3 hit papers · h-index 49

Impact in

Endocrine and Autonomic Systems top 0.5%
- Circadian rhythm and melatonin
Cellular and Molecular Neuroscience top 0.5%
- Photoreceptor and optogenetics research
- Neuroscience and Neuropharmacology Research

Papers in ⓘ

Cellular and Molecular Neuroscience 52
- Neuroscience and Neuropharmacology Research 24
- Photoreceptor and optogenetics research 24
Molecular Biology 100
- Connexins and lens biology 45
- Retinal Development and Disorders 29
- Ion channel regulation and function 16
- Nicotinic Acetylcholine Receptors Study 14
- RNA Interference and Gene Delivery 12

Co-authors: Terry C. Orton (1 shared paper)Ian D. Wilson (1 shared paper)François Pognan (1 shared paper)Graham I. H. Kerley (8 shared papers)Matt W. Hayward (8 shared papers)Michael H. Hastings (6 shared papers)Markus Hofmeyr (4 shared papers)Elizabeth S. Maywood (4 shared papers)
Journals: Journal of Neuroscience (10 papers)Investigative Ophthalmology & Visual Science (9 papers)The Journal of Comparative Neurology (5 papers)Cell Communication & Adhesion (4 papers)Research in Veterinary Science (4 papers)
Partner nations: United States United Kingdom Ireland

In The Last Decade

John O’Brien

175 papers receiving 10.7k citations

Hit Papers

align trajectories log scale

Prey preferences of the leopard (Panthera pardus) 2006 · 471 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2006 Journal of Zoology
2000 European Journal of Biochemistry
1998 Nature

Peers

Countries citing papers authored by John O’Brien

Since Specialization

Citations

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

Fields of papers citing papers by John O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authors

The 25 scholars most cited alongside John O’Brien, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with John O’Brien Line = papers co-authored together John O’Brien links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 179 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Investigation of the Alamar Blue (resazurin) fluorescent dye for the assessment of mammalian cell cytotoxicity European Journal of Biochemistry ·John O’Brien, Ian D. Wilson, Terry C. Orton, François Pognan Hit paper breakdown →	2000	2800
2	Altered nociception, analgesia and aggression in mice lacking the receptor for substance P Nature ·Carmen De Felipe, Juan F. Herrero, John O’Brien, James A. Palmer, Christopher A. Doyle, Andrew J. H. Smith, Jennifer M.A. Laird, Carlos Belmonte, Fernando Cerveró, Stephen P. Hunt Hit paper breakdown →	1998	620
3	Prey preferences of the leopard (Panthera pardus) Journal of Zoology ·Matt W. Hayward, Philipp Henschel, John O’Brien, Markus Hofmeyr, Guy A. Balme, Graham I. H. Kerley Hit paper breakdown →	2006	471
4	Synchronization and Maintenance of Timekeeping in Suprachiasmatic Circadian Clock Cells by Neuropeptidergic Signaling Current Biology ·Elizabeth S. Maywood, Akhilesh B. Reddy, Gabriel K.Y. Wong, John S. O’Neill, John O’Brien, Douglas G. McMahon, Anthony J. Harmar, Hitoshi Okamura, Michael H. Hastings	2006	351
5	Analysis of Clock Proteins in Mouse SCN Demonstrates Phylogenetic Divergence of the Circadian Clockwork and Resetting Mechanisms Neuron ·Manuel D Field, Elizabeth S Maywood, John O’Brien, David R. Weaver, Steven M. Reppert, Michael H. Hastings	2000	302
6	Acyclovir Drugs ·John O’Brien, Deborah M. Campoli-Richards	1989	287
7	Carrying capacity of large African predators: Predictions and tests Biological Conservation ·Matt W. Hayward, John O’Brien, Graham I. H. Kerley	2007	239
8	A diversity of paracrine signals sustains molecular circadian cycling in suprachiasmatic nucleus circuits Proceedings of the National Academy of Sciences ·Elizabeth S. Maywood, Johanna E. Chesham, John O’Brien, Michael H. Hastings	2011	231
9	Prey preferences of the cheetah (Acinonyx jubatus) (Felidae: Carnivora): morphological limitations or the need to capture rapidly consumable prey before kleptoparasites arrive? Journal of Zoology ·Matt W. Hayward, Markus Hofmeyr, John O’Brien, Graham I. H. Kerley	2006	167
10	Global Amphibian Declines, Loss of Genetic Diversity and Fitness: A Review Diversity ·Morten E. Allentoft, John O’Brien	2010	166
11	A Schwann cell mitogen accompanying regeneration of motor neurons Nature ·Frederick J. Livesey, John O’Brien, Meng Li, Austin Smith, Liam J. Murphy, Stephen P. Hunt	1997	153
12	The reintroduction of large carnivores to the Eastern Cape, South Africa: an assessment Oryx ·Matt W. Hayward, Graham I. H. Kerley, John Adendorff, Lucius C. Moolman, John O’Brien, Angus Sholto-Douglas, Charlene Bissett, Peter Bean, Alan Fogarty, Dale Howarth, Richard D. Slater	2007	151
13	Dopamine-Stimulated Dephosphorylation of Connexin 36 Mediates AII Amacrine Cell Uncoupling Journal of Neuroscience ·W. Wade Kothmann, Stephen C. Massey, John O’Brien	2009	142
14	PREY PREFERENCES OF THE AFRICAN WILD DOG LYCAON PICTUS (CANIDAE: CARNIVORA): ECOLOGICAL REQUIREMENTS FOR CONSERVATION Journal of Mammalogy ·Matt W. Hayward, John O’Brien, Markus Hofmeyr, Graham I. H. Kerley	2006	132
15	Efficacy of Varenicline Combined With Nicotine Replacement Therapy vs Varenicline Alone for Smoking Cessation JAMA ·Coenraad F.N. Koegelenberg, Firdows Noor, Eric D. Bateman, Richard N. van Zyl-Smit, Axel Bruning, John O’Brien, C.Douglas Smith, Mohamed Sabeer Abdool-Gaffar, Shaunagh Emanuel, Tonya M. Esterhuizen, Elvis M. Irusen	2014	130
16	Use of azathioprine or 6-mercaptopurine in the treatment of Crohn's disease Gastroenterology ·John O’Brien, Theodore M. Bayless, Jeffrey A. Bayless	1991	129
17	Rod pathways in the mammalian retina use connexin 36 The Journal of Comparative Neurology ·Stephen L. Mills, Jennifer OʼBrien, Wei Li, John O’Brien, Stephen C. Massey	2001	128
18	The circadian cycle of mPER clock gene products in the suprachiasmatic nucleus of the Siberian hamster encodes both daily and seasonal time European Journal of Neuroscience ·Barbara Nuesslein‐Hildesheim, John O’Brien, Francis J. P. Ebling, Elizabeth S. Maywood, Michael H. Hastings	2000	127
19	Cloning and Expression of Two Related Connexins from the Perch Retina Define a Distinct Subgroup of the Connexin Family Journal of Neuroscience ·John O’Brien, Roberto Bruzzone, Thomas W. White, Muayyad R. Al‐Ubaidi, Harris Ripps	1998	117
20	Adenosine and Dopamine Receptors Coregulate Photoreceptor Coupling via Gap Junction Phosphorylation in Mouse Retina Journal of Neuroscience ·Hongyan Li, Zhijing Zhang, Michael R. Blackburn, Steven W. Wang, Christophe Ribelayga, John O’Brien	2013	112

About John O’Brien

John O’Brien is a scholar working on Cellular and Molecular Neuroscience, Molecular Biology, Ecological Modeling, Sensory Systems and Aging, having authored 179 papers that have together received 11.1k indexed citations. Recurring topics across this work include Connexins and lens biology (45 papers), Retinal Development and Disorders (29 papers), Neuroscience and Neuropharmacology Research (24 papers), Photoreceptor and optogenetics research (24 papers), Ion channel regulation and function (16 papers), Wildlife Ecology and Conservation (14 papers), Nicotinic Acetylcholine Receptors Study (14 papers) and RNA Interference and Gene Delivery (12 papers). The work is most often cited by research in Endocrine and Autonomic Systems (1.3k citations), Cellular and Molecular Neuroscience (2.6k citations), Aging (175 citations), Ecology (1.7k citations) and Small Animals (452 citations). John O’Brien has collaborated with scholars based in United States, United Kingdom and Ireland. Frequent co-authors include Terry C. Orton, Ian D. Wilson, François Pognan, Graham I. H. Kerley, Matt W. Hayward, Michael H. Hastings, Markus Hofmeyr, Elizabeth S. Maywood, Deborah M. Campoli-Richards and Sarah C. R. Lummis. Their work appears in journals such as Journal of Neuroscience, Investigative Ophthalmology & Visual Science, The Journal of Comparative Neurology, Cell Communication & Adhesion and Research in Veterinary Science.

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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