{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/41342"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/41342","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Development and use of a chemically defined medium for estimating the oxygen tolerance of campylobacter species","abstract":"When estimating the degree of oxygen tolerance of Campylobacter spp. on Brucella medium, the brand of tryptone (pancreatic digest of casein) used in the medium greatly influenced the results. In fact, with some brands and batches of tryptone, C. jejuni could grow at 21 % O₂ without any additional scavengers of reactive oxygen intermediates (ROIs), although CO₂ was still required for growth. When the medium was prepared with other brands of tryptone, it did not allow growth of C. jejuni beyond 10% O₂. The dependence of the growth response on different types and brands of tryptone-based media makes it impossible to achieve reproducibility in oxygen tolerance studies. To eliminate such variation in complex media, we developed a chemically defined medium for Campylobacter spp. This medium allows reproducible colony counts to be obtained. The medium was used to assess the effect of ROI scavengers on the oxygen tolerance of various Campylobacter species. Allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate when used singly were the most effective in enhancing oxygen tolerance. When ROI scavengers were combined with dimethyl sulfoxide, the effects of allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate were even more pronounced than when they were used alone. A combination of tetramethylpiperidine-1-oxyl (1EMPOL), a superoxide dis mutase mimic, with pyruvate also enhanced oxygen tolerance effectively. A survey of the literature dealing with the types of ROIs destroyed by scavengers used in our study suggests that hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH.) are the most toxic ROIs for Campylobacter species.","abstract_html":"When estimating the degree of oxygen tolerance of Campylobacter spp. on Brucella medium, the brand of tryptone (pancreatic digest of casein) used in the medium greatly influenced the results. In fact, with some brands and batches of tryptone, C. jejuni could grow at 21 % O₂ without any additional scavengers of reactive oxygen intermediates (ROIs), although CO₂ was still required for growth. When the medium was prepared with other brands of tryptone, it did not allow growth of C. jejuni beyond 10% O₂. The dependence of the growth response on different types and brands of tryptone-based media makes it impossible to achieve reproducibility in oxygen tolerance studies. To eliminate such variation in complex media, we developed a chemically defined medium for Campylobacter spp. This medium allows reproducible colony counts to be obtained. The medium was used to assess the effect of ROI scavengers on the oxygen tolerance of various Campylobacter species. Allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate when used singly were the most effective in enhancing oxygen tolerance. When ROI scavengers were combined with dimethyl sulfoxide, the effects of allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate were even more pronounced than when they were used alone. A combination of tetramethylpiperidine-1-oxyl (1EMPOL), a superoxide dis mutase mimic, with pyruvate also enhanced oxygen tolerance effectively. A survey of the literature dealing with the types of ROIs destroyed by scavengers used in our study suggests that hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH.) are the most toxic ROIs for Campylobacter species.","abstract_has_math":false,"creators":["Hodge, Jeffrey Paul"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Biology (Microbiology)","degree_department":"Biology (Microbiology)","school":null,"contributors":[],"advisors":[],"committee_chairs":["Krieg, Noel R."],"committee_members":["Smibert, Robert M.","Gregory, Eugene M.","Yousten, Allan A."],"year":1993,"date_issued":"1993-06-05","date_published":"1993-06-05","updated_at":"2026-07-22T22:18:46Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-03032009-040333"],"render_values":[{"text":"etd-03032009-040333","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/41342","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Krieg, Noel R."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Smibert, Robert M.","Gregory, Eugene M.","Yousten, Allan A."]},{"key":"dc:contributor.department","label":"Department","values":["Biology (Microbiology)"]},{"key":"dc:creator","label":"Author","values":["Hodge, Jeffrey Paul"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:30:30Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:30:30Z","2009-03-03"]},{"key":"dc:date.issued","label":"Date","values":["1993-06-05"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biology (Microbiology)"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-03032009-040333"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/41342"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["When estimating the degree of oxygen tolerance of Campylobacter spp. on Brucella medium, the brand of tryptone (pancreatic digest of casein) used in the medium greatly influenced the results. In fact, with some brands and batches of tryptone, C. jejuni could grow at 21 % O₂ without any additional scavengers of reactive oxygen intermediates (ROIs), although CO₂ was still required for growth. When the medium was prepared with other brands of tryptone, it did not allow growth of C. jejuni beyond 10% O₂. The dependence of the growth response on different types and brands of tryptone-based media makes it impossible to achieve reproducibility in oxygen tolerance studies. To eliminate such variation in complex media, we developed a chemically defined medium for Campylobacter spp. This medium allows reproducible colony counts to be obtained. The medium was used to assess the effect of ROI scavengers on the oxygen tolerance of various Campylobacter species. Allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate when used singly were the most effective in enhancing oxygen tolerance. When ROI scavengers were combined with dimethyl sulfoxide, the effects of allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate were even more pronounced than when they were used alone. A combination of tetramethylpiperidine-1-oxyl (1EMPOL), a superoxide dis mutase mimic, with pyruvate also enhanced oxygen tolerance effectively. A survey of the literature dealing with the types of ROIs destroyed by scavengers used in our study suggests that hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH.) are the most toxic ROIs for Campylobacter species."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Development and use of a chemically defined medium for estimating the oxygen tolerance of campylobacter species"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Krieg, Noel R."],"dc:contributor.committeemember":["Smibert, Robert M.","Gregory, Eugene M.","Yousten, Allan A."],"dc:contributor.department":["Biology (Microbiology)"],"dc:creator":["Hodge, Jeffrey Paul"],"dc:date.accessioned":["2014-03-14T21:30:30Z"],"dc:date.available":["2014-03-14T21:30:30Z","2009-03-03"],"dc:date.issued":["1993-06-05"],"dc:description.abstract":["When estimating the degree of oxygen tolerance of Campylobacter spp. on Brucella medium, the brand of tryptone (pancreatic digest of casein) used in the medium greatly influenced the results. In fact, with some brands and batches of tryptone, C. jejuni could grow at 21 % O₂ without any additional scavengers of reactive oxygen intermediates (ROIs), although CO₂ was still required for growth. When the medium was prepared with other brands of tryptone, it did not allow growth of C. jejuni beyond 10% O₂. The dependence of the growth response on different types and brands of tryptone-based media makes it impossible to achieve reproducibility in oxygen tolerance studies. To eliminate such variation in complex media, we developed a chemically defined medium for Campylobacter spp. This medium allows reproducible colony counts to be obtained. The medium was used to assess the effect of ROI scavengers on the oxygen tolerance of various Campylobacter species. Allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate when used singly were the most effective in enhancing oxygen tolerance. When ROI scavengers were combined with dimethyl sulfoxide, the effects of allopurinol, azelaic acid, caffeine, cimetidine, and pyruvate were even more pronounced than when they were used alone. A combination of tetramethylpiperidine-1-oxyl (1EMPOL), a superoxide dis mutase mimic, with pyruvate also enhanced oxygen tolerance effectively. A survey of the literature dealing with the types of ROIs destroyed by scavengers used in our study suggests that hydrogen peroxide (H₂O₂) and hydroxyl radicals (OH.) are the most toxic ROIs for Campylobacter species."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-03032009-040333"],"dc:identifier.uri":["http://hdl.handle.net/10919/41342"],"dc:language.iso":["en"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Development and use of a chemically defined medium for estimating the oxygen tolerance of campylobacter species"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Biology (Microbiology)"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:18:46Z"}