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  • 1
    In: Canadian Journal of Microbiology, Canadian Science Publishing, Vol. 51, No. 10 ( 2005-09-01), p. 887-892
    Abstract: Sixty-eight Bordetella pertussis isolates (obtained between 1994 and 2004 from the province of Ontario in Canada) were compared by the following phenotypic and genetic analyses: serotyping; pulsed-field gel electrophoresis; and partial DNA sequence analysis of their pertactin, pertussis toxin, and fimbriae genes. Although temporal genetic variations were observed among the isolates, which is consistent with the current view that B. pertussis evolves over time, no specific antigenic or genetic type was detected in 48 isolates collected shortly after the introduction of the acellular pertussis vaccine. Further surveillance with clinical data and isolates collected periodically will be required to ensure that any genetic divergence that could affect vaccine efficacy will not be occurring.Key words: pertussis, genetic analysis, acellular vaccine.
    Type of Medium: Online Resource
    ISSN: 0008-4166 , 1480-3275
    RVK:
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 280534-0
    detail.hit.zdb_id: 1481972-7
    SSG: 12
    Location Call Number Limitation Availability
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  • 2
    In: Canadian Journal of Physiology and Pharmacology, Canadian Science Publishing, Vol. 91, No. 4 ( 2013-04), p. 316-324
    Abstract: Triton X-100 (TX-100) is a nonionic detergent frequently used at millimolar concentrations to disrupt cell membranes and solubilize proteins. At low micromolar concentrations, TX-100 has been reported to inhibit the function of potassium channels. Here, we have used electrophysiological and functional techniques to examine the effects of TX-100 on another class of ion channels, L-type voltage-operated calcium channels (VOCCs). TX-100 (30 nmol·L –1 to 3 μmol·L –1 ) caused reversible concentration-dependent inhibition of recombinant L-type VOCC (Ca V 1.2) currents and of native L-type VOCC currents recorded from rat vascular smooth muscle cells and cardiac myocytes, and murine and human pancreatic β-cells. In functional studies, TX-100 (165 nmol·L –1 to 3.4 μmol·L –1 ) caused concentration-dependent relaxation of rat isolated mesenteric resistance arteries prestimulated with phenylephrine or KCl. This effect was independent of the endothelium. TX-100 (1.6 μmol·L –1 ) inhibited depolarization-induced exocytosis in both murine and human isolated pancreatic β-cells. These data indicate that at concentrations within the nanomolar to low micromolar range, TX-100 significantly inhibits L-type VOCC activity in a number of cell types, an effect paralleled by inhibition of cell functions dependent upon activation of these channels. This inhibition occurs at concentrations below those used to solubilize proteins and may compromise the use of solutions containing TX-100 in bioassays.
    Type of Medium: Online Resource
    ISSN: 0008-4212 , 1205-7541
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 2004356-9
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  • 3
    In: Canadian Journal of Microbiology, Canadian Science Publishing, Vol. 58, No. 10 ( 2012-10), p. 1236-1240
    Abstract: This study examined serogroup B meningococci (MenB) from invasive meningococcal disease (IMD) cases in the provinces of Québec and Ontario in the last decade by multilocus sequence typing (MLST) to determine their sequence types (STs) and clonal complexes (CCs). Forty isolates from individual MenB IMD cases were found to belong to 8 related STs, with ST-336 being the founding ST and the other 7 STs being single locus variants of ST-336. Eleven isolates belonged to ST-336, 23 belonged to ST-5571, and the other 6 were represented individually by a single different ST. All but 1 of these 40 isolates have the PorA variable-region type of P1.22,14,36. Interrogation of the Neisseria MLST web site with the present finding did not put any of the 8 related STs into known CCs. Since these 8 related STs were common causes of IMD, with ST-5571 being the most frequently identified ST in Ontario and ST-336 the third most common ST identified in Québec, we propose that ST-336 and its related STs is a potentially new meningococcal clonal complex that is endemic in the Canadian provinces of Québec and Ontario, and they constitute a common cause of IMD.
    Type of Medium: Online Resource
    ISSN: 0008-4166 , 1480-3275
    RVK:
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 280534-0
    detail.hit.zdb_id: 1481972-7
    SSG: 12
    Location Call Number Limitation Availability
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