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Articles 571 - 573 of 573
Full-Text Articles in Entire DC Network
Development Of A Blocking Enzyme-Linked Immunosorbent Assay For Detection Of Serum Antibodies To O157 Antigen Of Escherichia Coli., W Laegreid, M Hoffman, J Keen, R Elder, J Kwang
Development Of A Blocking Enzyme-Linked Immunosorbent Assay For Detection Of Serum Antibodies To O157 Antigen Of Escherichia Coli., W Laegreid, M Hoffman, J Keen, R Elder, J Kwang
Manuscripts, Articles, Book Chapters and Other Papers
The O157 antigen of Escherichia coli shares structural elements with lipopolysaccharide (LPS) antigens of other bacterial species, notably Brucella abortus and Yersinia enterocolitica 09, a fact that confounds the interpretation of assays for anti-O157 antibodies. To address this problem, a blocking enzyme-linked immunosorbent assay (bELISA) was designed with E. coli O157:H7 LPS as the antigen and a monoclonal antibody specific for E. coli O157, designated 13B3, as the competing antibody. The bELISA had equivalent sensitivity to, and significantly higher specificity than, the indirect ELISA (iELISA), detecting anti-O157 antibodies in sera from cattle experimentally inoculated with O157:H7. Only 13% of sera …
Biochemical And Mutational Analysis Of The Histidine Residues Of Staphylococcal Enterotoxin A., M Hoffman, M Tremaine, J Mansfield, M Betley
Biochemical And Mutational Analysis Of The Histidine Residues Of Staphylococcal Enterotoxin A., M Hoffman, M Tremaine, J Mansfield, M Betley
Manuscripts, Articles, Book Chapters and Other Papers
The goal of this study was to examine the role of histidine residues in the biological activities of staphylococcal enterotoxin A (SEA). Carboxymethylated SEA was unable to stimulate murine T-cell proliferation but was resistant to monkey stomach lavage fluid degradation, suggesting that native conformation was intact. Site-directed mutagenesis of the histidine residues of SEA was subsequently performed. SEA-H44A (SEA with histidine 44 replaced with alanine), SEA-H44D, SEA-H50A, SEA-H50D, SEA-H114A, SEA-H114D, SEA-H187A, and SEA-H187D retained superantigen and emetic activities, whereas SEA-H225A and SEA-H225D were defective in the ability to stimulate T-cell proliferation. These mutants were unable to compete with SEA for …
A Call To Action: The Institute Of Medicine Report On Emergency Medical Services For Children., J F. Knapp
A Call To Action: The Institute Of Medicine Report On Emergency Medical Services For Children., J F. Knapp
Manuscripts, Articles, Book Chapters and Other Papers
No abstract provided.