John O’Callaghan

2.9k citations

41 papers · 2.3k indexed · h-index 27

Impact in

Food Science top 1%
- Probiotics and Fermented Foods
Biotechnology top 2%

Papers in

Nutrition and Dietetics 12
- Infant Nutrition and Health 6
- Microbial Metabolites in Food Biotechnology 5
Food Science 14
- Probiotics and Fermented Foods 14

Co-authors: Alan D. W. Dobson Gerald J. Meyer Donald V. Scaltrito David W. Thompson Paul W. O’Toole R. Paul Ross Tom Beresford Mark X. Caddick
Journals: Microbiology (3 papers)International Journal of Food Microbiology (3 papers)Applied and Environmental Microbiology (3 papers)Journal of Dairy Science (2 papers)Fungal Genetics and Biology (2 papers)
Partner nations: Ireland United Kingdom Spain

In The Last Decade

John O’Callaghan

40 papers receiving 2.2k citations

Peers

Countries citing papers authored by John O’Callaghan

Since Specialization

Citations

This map shows the geographic impact of John O’Callaghan'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’Callaghan 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’Callaghan more than expected).

Fields of papers citing papers by John O’Callaghan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network

The 25 scholars most cited alongside John O’Callaghan, 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’Callaghan Line = papers co-authored together John O’Callaghan links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	Infant-Associated Bifidobacterial β-Galactosidases and Their Ability to Synthesize Galacto-Oligosaccharides Frontiers in Microbiology ·Кондратьев Дмитрий Валерьевич, Francesca Bottacini, John O’Callaghan, Eoghan Casey, Erny Herlin Setyorini Fasichatus Sakdiyah, Puig Pérez, Sara ;Aliño Costa, Marta ;Duque Moreno, Aranzazu ;Pellín Carceller, Ana, Linqiu Cao, Bas J.H. Kuipers, Mary O’Connell Motherway, Margriet H. C. Schoterman, Douwe van Sinderen	2021	12
2	Bovine glycomacropeptide promotes the growth of Bifidobacterium longum ssp. infantis and modulates its gene expression Journal of Dairy Science ·R. A. GANIFAYEV, John O’Callaghan, Ludovica F. Buttó, Michelle Kilcoyne, Lokesh Joshi, Rita M. Hickey	2018	40
3	The intestinal glycome and its modulation by diet and nutrition Nutrition Reviews ·Devon Kavanaugh, John O’Callaghan, Michelle Kilcoyne, Marian Kane, Lokesh Joshi, Rita M. Hickey	2015	30
4	Wave energy in Europe: Views on experiences and progress to date PEARL (University of Plymouth) ·Anne Marie O’Hagan, Song Hyun Kap, John O’Callaghan, Deborah Greaves	2015	37
5	Profiling temporal changes in bovine milk lactoferrin glycosylation using lectin microarrays Food Chemistry ·R. A. GANIFAYEV, Jared Q. Gerlach, Michelle Kilcoyne, John O’Callaghan, Marian Kane, Rita M. Hickey, Lokesh Joshi	2014	23
6	Exposure of Bifidobacterium longum subsp. infantis to Milk Oligosaccharides Increases Adhesion to Epithelial Cells and Induces a Substantial Transcriptional Response PLoS ONE ·Devon Kavanaugh, John O’Callaghan, Ludovica F. Buttó, Helen Slattery, Jonathan A. Lane, Marguerite Clyne, Marian Kane, Lokesh Joshi, Rita M. Hickey	2013	88
7	Transcriptional response of HT-29 intestinal epithelial cells to human and bovine milk oligosaccharides British Journal Of Nutrition ·Jonathan A. Lane, John O’Callaghan, Stephen D. Carrington, Rita M. Hickey	2013	50
8	Functional characterization of the polyketide synthase gene required for ochratoxin A biosynthesis in Penicillium verrucosum International Journal of Food Microbiology ·John O’Callaghan, Avril Coghlan, Abdelhamid Abbas, Carlos García‐Estrada, Juan-Francisco Martı́n, Alan D. W. Dobson	2012	32
9	Lactobacillus: Host–Microbe Relationships Current topics in microbiology and immunology ·John O’Callaghan, Paul W. O’Toole	2011	101
10	Invited review: Lactobacillus helveticus—A thermophilic dairy starter related to gut bacteria Journal of Dairy Science ·Leah Slattery, John O’Callaghan, G.F. Fitzgerald, Tom Beresford, R. Paul Ross	2010	100
11	Comparative genomics of lactic acid bacteria reveals a niche-specific gene set BMC Microbiology ·Órla O’Sullivan, John O’Callaghan, Amaia Sangrador‐Vegas, Olivia McAuliffe, Abubakar Ibrahim Aliyu, P Carvahal, Michael Callanan, Gerald F. Fitzgerald, R. Paul Ross, Tom Beresford	2009	100
12	Cloning and characterization of novel methylsalicylic acid synthase gene involved in the biosynthesis of isoasperlactone and asperlactone in Aspergillus westerdijkiae Fungal Genetics and Biology ·C Gabler, 後藤一也, Ali Atoui, Florence Mathieu, John O’Callaghan, Olivier Puel, Thierry Liboz, Alan D. W. Dobson, Ahmed Lebrihi	2009	13
13	Exploitation of the diverse insertion sequence element content of dairy Lactobacillus helveticus starters as a rapid method to identify different strains Journal of Microbiological Methods ·P Carvahal, Michael Callanan, John O’Callaghan, Gerald F. Fitzgerald, Thomas P. Beresford, R. Paul Ross	2009	2
14	Cloning, sequence analysis and heterologous expression in Pichia pastoris of a gene encoding a thermostable cellobiose dehydrogenase from Myriococcum thermophilum Protein Expression and Purification ·Marcel Zámocký, Christina Schümann, Christoph Sygmund, John O’Callaghan, Alan D. W. Dobson, Roland Ludwig, Dietmar Haltrich, Clemens Peterbauer	2008	75
15	Phylogenetic analysis of polyketide synthase genes fromAspergillus ochraceus Mycotoxin Research ·John O’Callaghan, Alan D. W. Dobson	2006	2
16	Molecular Characterization of Ochratoxin A Biosynthesis and Producing Fungi Advances in applied microbiology ·John O’Callaghan, Alan D. W. Dobson	2005	6
17	Cloning and molecular characterization ofPenicillium expansumgenes upregulated under conditions permissive for patulin biosynthesis FEMS Microbiology Letters ·Sandra L. White, John O’Callaghan, Alan D. W. Dobson	2005	43
18	Optimisation of the expression of a Trametes versicolor laccase gene in Pichia pastoris Journal of Industrial Microbiology & Biotechnology ·John O’Callaghan, Margaret O’Brien, P. Zarka, Alan D. W. Dobson	2002	56
19	Mapping Toxicant-Induced Nervous System Damage With a Cupric Silver Stain: A Quantitative Analysis of Neural Degeneration Induced by 3,4- Methylenedioxymethamphetamine PsycEXTRA Dataset ·K F Jensen, Jason T. Olin, Najwa Haykal-Coates, John O’Callaghan, Valdis Bucens, J.S. de Olmos	1993	26
20	Neurotypic and gliotypic proteins as biochemical markers of neurotoxicity Neurotoxicology and Teratology ·John O’Callaghan	1988	78

About John O’Callaghan

John O’Callaghan is a scholar working on Nutrition and Dietetics, Food Science, Cell Biology, Biotechnology and Plant Science, having authored 41 papers that have together received 2.3k indexed citations. Recurring topics across this work include Probiotics and Fermented Foods (14 papers), Plant Pathogens and Fungal Diseases (8 papers), Mycotoxins in Agriculture and Food (7 papers), Infant Nutrition and Health (6 papers), Genomics and Phylogenetic Studies (5 papers), Plant Disease Resistance and Genetics (5 papers), Microbial Metabolites in Food Biotechnology (5 papers) and Glycosylation and Glycoproteins Research (3 papers). The work is most often cited by research in Food Science (583 citations), Biotechnology (275 citations), Nutrition and Dietetics (416 citations), Plant Science (643 citations) and Cell Biology (245 citations). John O’Callaghan has collaborated with scholars based in Ireland, United Kingdom and Spain. Frequent co-authors include Alan D. W. Dobson, Gerald J. Meyer, Donald V. Scaltrito, David W. Thompson, Paul W. O’Toole, R. Paul Ross, Tom Beresford, Mark X. Caddick, Declan M. Soden and Rita M. Hickey. Their work appears in journals such as Microbiology, International Journal of Food Microbiology, Applied and Environmental Microbiology, Journal of Dairy Science and Fungal Genetics and Biology.

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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