John A. Walter

6.1k citations

105 papers · 4.7k · 1 hit paper · h-index 36

Impact in

Environmental Chemistry top 0.1%
- Marine Toxins and Detection Methods
Oceanography top 1%
- Marine and coastal ecosystems

Papers in

Molecular Biology 46
- Nicotinic Acetylcholine Receptors Study 11
- Metabolomics and Mass Spectrometry Studies 9
Environmental Chemistry 40
- Marine Toxins and Detection Methods 40

Co-authors: Jeffrey L. C. Wright (46 shared papers)Michael A. Quilliam (16 shared papers)A. G. McInnes (40 shared papers)Ian W. Burton (19 shared papers)Tingmo Hu (13 shared papers)Jonathan M. Curtis (10 shared papers)Michael Falk (12 shared papers)Donald G. Smith (16 shared papers)
Journals: Canadian Journal of Chemistry (21 papers)Tetrahedron Letters (7 papers)Journal of Natural Products (6 papers)The Journal of Antibiotics (4 papers)Phytochemistry (3 papers)
Partner nations: Canada United States Australia

In The Last Decade

John A. Walter

104 papers receiving 4.4k citations

John A. Walter's Hit Papers

align trajectories log scale

Pennate Diatom Nitzschia pungens as the Primary Source of Domoic Acid, a Toxin in Shellfish from Eastern Prince Edward Island, Canada 1989 · 531 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.

1989 Canadian Journal of Fisheries and Aquatic Sciences

Peers

Countries citing papers authored by John A. Walter

Since Specialization

Citations

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

Fields of papers citing papers by John A. Walter

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authors

The 25 scholars most cited alongside John A. Walter, 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 A. Walter Line = papers co-authored together John A. Walter 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 105 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Pennate Diatom Nitzschia pungens as the Primary Source of Domoic Acid, a Toxin in Shellfish from Eastern Prince Edward Island, Canada Canadian Journal of Fisheries and Aquatic Sciences ·Stephen S. Bates, C. J. Bird, Arlan Silva Freitas, R. A. Foxall, Michael W. Gilgan, Louis A. Hanic, G. R. Johnson, A. W. McCulloch, P. H. Odense, Roger Pocklington, Michael A. Quilliam, P. G. Sim, Jeremy C. Smith, D. V. Subba Rao, Ewen C.D. Todd, John A. Walter, Jeffrey L. C. Wright Hit paper breakdown →	1989	531
2	Identification of domoic acid, a neuroexcitatory amino acid, in toxic mussels from eastern Prince Edward Island Canadian Journal of Chemistry ·Jeffrey L. C. Wright, R. K. Boyd, Arlan Silva Freitas, Michael Falk, R. A. Foxall, W. D. Jamieson, M. V. Laycock, A. W. McCulloch, A. G. McInnes, P. H. Odense, Vibha Pathak, Michael A. Quilliam, Mark A. Ragan, P. G. Sim, Pierre Thibault, John A. Walter, Michael W. Gilgan, D J A Richard, Danielle Dewar	1989	336
3	Identification of C-24 alkyl epimers of marine sterols by ¹³C nuclear magnetic resonance spectroscopy Canadian Journal of Chemistry ·J. L. C. Sright, A. G. McInnes, Susana Shimizu, Donald G. Smith, John A. Walter, D. R. Idler, Wagdy K. B. Khalil	1978	259
4	Spirolides B and D, two novel macrocycles isolated from the digestive glands of shellfish Journal of the Chemical Society Chemical Communications ·Tingmo Hu, Jonathan M. Curtis, Yasukatsu Oshima, Michael A. Quilliam, John A. Walter, Wendy Watson-Wright, Jeffrey L. C. Wright	1995	160
5	Quantitative ¹H NMR with External Standards: Use in Preparation of Calibration Solutions for Algal Toxins and Other Natural Products Analytical Chemistry ·Ian W. Burton, Michael A. Quilliam, John A. Walter	2005	159
6	Characterization of Spirolides A, C, and 13-Desmethyl C, New Marine Toxins Isolated from Toxic Plankton and Contaminated Shellfish Journal of Natural Products ·Tingmo Hu, Ian W. Burton, Allan Cembella, Jonathan M. Curtis, Michael A. Quilliam, John A. Walter, Jeffrey L. C. Wright	2001	146
7	International NMR-Based Environmental Metabolomics Intercomparison Exercise Environmental Science & Technology ·Mark R. Viant, Daniel W. Bearden, Jacob G. Bundy, Ian W. Burton, Timothy W. Collette, Drew R. Ekman, Vilnis Ezernieks, Tobias K. Karakach, Ching‐Yu Lin, Simone Rochfort, Jeffrey S. de Ropp, Quincy Teng, Ronald S. Tjeerdema, John A. Walter, Huifeng Wu	2008	119
8	Characterization of biologically inactive spirolides E and F: Identification of the spirolide pharmacophore Tetrahedron Letters ·Tingmo Hu, Jonathan M. Curtis, John A. Walter, Jeffrey L. C. Wright	1996	108
9	Carrageenans in the gametophytic and sporophytic stages of Chondrus crispus Planta ·Esther L. McCandless, J. S. Craigie, John A. Walter	1973	107
10	Interaction of domoic acid and several derivatives with kainic acid and AMPA binding sites in rat brain European Journal of Pharmacology ·David R. Hampson, Xi‐Ping Huang, James W. Wells, John A. Walter, Jeffrey L. C. Wright	1992	104
11	Three Novel Hydroxybenzoate Saxitoxin Analogues Isolated from the Dinoflagellate Gymnodinium catenatum Chemical Research in Toxicology ·Andrew P. Negri, David Stirling, Michael A. Quilliam, Susan I. Blackburn, Chris J S Bolch, Ian W. Burton, Geoff Eaglesham, Krista Thomas, John A. Walter, Rick Willis	2003	98
12	Isolation of a new diarrhetic shellfish poison from Irish mussels Journal of the Chemical Society Chemical Communications ·Tingmo Hu, Jacqueline Doyle, David Jackson, J. C. Marr, Eugene R. Nixon, Stephen Pleasance, Michael A. Quilliam, John A. Walter, Jeffrey L. C. Wright	1992	96
13	New Diol Esters Isolated from Cultures of the Dinoflagellates Prorocentrum lima and Prorocentrum concavum Journal of Natural Products ·Tingmo Hu, J. C. Marr, Anthony S. W. de Freitas, Michael A. Quilliam, John A. Walter, Jeffrey L. C. Wright, Stephen Pleasance	1992	96
14	Detection and Identification of Spirolides in Norwegian Shellfish and Plankton Chemical Research in Toxicology ·John Aasen, Shawna L. MacKinnon, Patricia LeBlanc, John A. Walter, Peter Hovgaard, Tore Aune, Michael A. Quilliam	2005	91
15	Isolation and Structure Elucidation of New and Unusual Saxitoxin Analogues from Mussels Journal of Natural Products ·Carmela Dell’Aversano, John A. Walter, Ian W. Burton, David Stirling, Ernesto Fattorusso, Michael A. Quilliam	2008	91
16	Identification of DTX-4, a new water-soluble phosphatase inhibitor from the toxic dinoflagellate Prorocentrum lima Journal of the Chemical Society Chemical Communications ·Tingmo Hu, Jonathan M. Curtis, John A. Walter, Jeffrey L. C. Wright	1995	87
17	Contribution of the type III secretion system (TTSS) to virulence of Aeromonas salmonicida subsp. salmonicida Microbiology ·Andrew Dacanay, Leah C. Knickle, Kirty S. Solanky, Jessica M. Boyd, John A. Walter, Laura L. Brown, Stewart C. Johnson, Michael Reith	2006	81
18	Biosynthesis of DTX-4: Confirmation of a Polyketide Pathway, Proof of a Baeyer−Villiger Oxidation Step, and Evidence for an Unusual Carbon Deletion Process Journal of the American Chemical Society ·Jeffrey L. C. Wright, T. HU, J. L. McLachlan, Judy Needham, John A. Walter	1996	76
19	Identification of isodomoic acid D and two new geometrical isomers of domoic acid in toxic mussels Canadian Journal of Chemistry ·Jeffrey L. C. Wright, Michael Falk, A. G. McInnes, John A. Walter	1990	71
20	Jadomycin, a novel 8H-benz[b]oxazolo[3,2-f]phenanthridine antibiotic from from streptomyces venezuelae ISP5230. Tetrahedron Letters ·Stephen W. Ayer, A. G. McInnes, Pierre Thibault, John A. Walter, Janice L. Doull, Tracy Parnell, L. C. Vining	1991	71

About John A. Walter

John A. Walter is a scholar working on Molecular Biology, Environmental Chemistry, Organic Chemistry, Pharmacology and Spectroscopy, having authored 105 papers that have together received 4.7k indexed citations. Recurring topics across this work include Marine Toxins and Detection Methods (40 papers), Microbial Natural Products and Biosynthesis (17 papers), Nicotinic Acetylcholine Receptors Study (11 papers), Chemical synthesis and alkaloids (11 papers), Marine Sponges and Natural Products (10 papers), Seaweed-derived Bioactive Compounds (9 papers), Metabolomics and Mass Spectrometry Studies (9 papers) and Marine and coastal ecosystems (8 papers). The work is most often cited by research in Environmental Chemistry (2.5k citations), Oceanography (1.1k citations), Biotechnology (552 citations), Toxicology (171 citations) and Aquatic Science (303 citations). John A. Walter has collaborated with scholars based in Canada, United States and Australia. Frequent co-authors include Jeffrey L. C. Wright, Michael A. Quilliam, A. G. McInnes, Ian W. Burton, Tingmo Hu, Jonathan M. Curtis, Michael Falk, Donald G. Smith, L. C. Vining and A. W. McCulloch. Their work appears in journals such as Canadian Journal of Chemistry, Tetrahedron Letters, Journal of Natural Products, The Journal of Antibiotics and Phytochemistry.

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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John A. Walter

John A. Walter's Hit Papers

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