کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2091293 1081540 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced contrast of bacteriophage plaques in Salmonella with ferric ammonium citrate and sodium thiosulfate (FACST) and tetrazolium red (TZR)
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوتکنولوژی یا زیست‌فناوری
پیش نمایش صفحه اول مقاله
Enhanced contrast of bacteriophage plaques in Salmonella with ferric ammonium citrate and sodium thiosulfate (FACST) and tetrazolium red (TZR)
چکیده انگلیسی

Visualization of bacteriophage plaques may be enhanced by addition of ferric ammonium citrate and sodium thiosulfate (FACST) or 2,3,5-triphenyltetrazolium chloride (tetrazolium red, TZR) to the soft agar layer of a traditional bacteriophage plaque assay. Background color from these reagents improved contrast between clear plaques and turbid host lawns in trypticase soy agar (TSA) plates. Enhancement by FACST is based on reaction with hydrogen sulfide gas (H2S) produced by some strains of bacteria and was tested here using H2S+ and H2S− strains of Salmonella enterica subsp. enterica with a bacteriophage (Podoviridae) isolated from swine lagoon effluent. Only the H2S+ strain produced dark brown-black color in FACST-amended agar. Both strains showed bright pinkish-red color in TZR-amended agar. Color intensity for both reagents decreased with decreasing concentrations of the reagents. Contrast in FACST-amended plates appeared greater than that with TZR, but diminished after 12 h, while contrast in TZR-amended plates remained constant. At the concentrations tested, neither reagent affected plaque counts in the H2S+ strain. The FACST should be useful in bacteriophage plaque assays with H2S+ strains of Salmonella and other H2S+ bacteria.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Microbiological Methods - Volume 65, Issue 2, May 2006, Pages 318–323
نویسندگان
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