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6 protocols using viia7 real time pcr thermocycler

1

Quantitative Real-Time PCR Profiling

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Total RNA was obtained and isolated using RNeasy Mini Kit (Qiagen, Venlo, Netherlands). 0.5 μg of this RNA were reversely transcribed using Moloney Murine Leukemia Virus reverse transcriptase, oligo (dT) and random decamers (Ambion, Carlsbad, CA). Two microliters of the reaction were used as a template for the qPCR amplification reaction (LightCycler 480SYBER Green I Master Mix, Roche) in a ViiA 7 Real-Time PCR thermocycler (Applied Biosystems). Quantitative data was normalized to β-actin expression. All primers used are available in Table S2.
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2

Inflammatory Cytokine Expression Profiling

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Teff frozen in Qiazol were defrosted and RNA was isolated and purified via chloroform extraction using the miRNeasy Micro Kit, following the manufacturer’s protocol for isolation of total RNA from small samples [Qiagen]. RNA concentration was quantified using a Nanodrop spectrophotometer [Thermofisher Scientific]; 100 ng of total RNA per sample was reverse-transcribed using the RevertAid First Strand cDNA Synthesis Kit and random hexamer primers according to the manufacturer’s protocol. Quantitative polymerase chain reaction [qPCR] was performed using a ViiA 7 real-time PCR thermocycler [Applied Biosystems] in a final volume of 10 µl, using the 2 x Maxima probe/ROX qPCR Master Mix [Thermofisher Scientific] and the cDNA equivalent of 5 ng total RNA per sample. Detection of transcripts for pro-inflammatory cytokines was carried out using FAM-labelled 20 x TaqMan probe assays [Thermofisher Scientific] for IFNG [assay ID: HS00989291_m1] and TNF [assay ID: HS00174128_m1] and relative expression of each gene was calculated using the comparative cycle threshold [Ct] method [2-ΔCt] using GAPDH [assay ID: HS99999905_m1] as the endogenous reference control. Reactions were run in duplicates and the average Ct value for each reaction was used for analysis.
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3

Quantitative PCR for Candida albicans

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RNA extracted from fetal lung, skin, chorioamnion and spleen was screened using a real-time PCR assay targeting the RNase P RNA gene of C. albicans 29 (link). RNA-based reactions were performed using an EXPRESS One-Step SuperScript qRT-PCR Kit (Life Technologies) with 0.5 μM each primer, 0.2 μM probe, 400 ng template RNA and water to a final volume of 20 μL. To enable quantitation of C. albicans within each sample, a standard curve of pure C. albicans (study isolate) RNA was included in each assay at a final concentration of 40, 4 and 0.4 ng per 20 uL reaction. Reaction cycling conditions were as follows: 15 min reverse transcription at 50°C and an initial denaturation at 95°C for 20 s, followed by 40 cycles of 95°C for 3 s and 60°C for 30 s. All reactions were performed in 96 well plates on a ViiA7 real-time PCR thermocycler (Life Technologies). The presence of viable C. albicans in amniotic fluid samples was determined using a Sabaraud-Dextrose agar plate dilution series as described above. Three single colonies from positive plates were subsequently inoculated onto Candida Brilliance agar (Oxoid, Basingstoke, UK) for confirmation of isolate identification.
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4

Quantitative PCR for Candida albicans

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RNA extracted from fetal lung, skin, chorioamnion and spleen was screened using a real-time PCR assay targeting the RNase P RNA gene of C. albicans 29 (link). RNA-based reactions were performed using an EXPRESS One-Step SuperScript qRT-PCR Kit (Life Technologies) with 0.5 μM each primer, 0.2 μM probe, 400 ng template RNA and water to a final volume of 20 μL. To enable quantitation of C. albicans within each sample, a standard curve of pure C. albicans (study isolate) RNA was included in each assay at a final concentration of 40, 4 and 0.4 ng per 20 uL reaction. Reaction cycling conditions were as follows: 15 min reverse transcription at 50°C and an initial denaturation at 95°C for 20 s, followed by 40 cycles of 95°C for 3 s and 60°C for 30 s. All reactions were performed in 96 well plates on a ViiA7 real-time PCR thermocycler (Life Technologies). The presence of viable C. albicans in amniotic fluid samples was determined using a Sabaraud-Dextrose agar plate dilution series as described above. Three single colonies from positive plates were subsequently inoculated onto Candida Brilliance agar (Oxoid, Basingstoke, UK) for confirmation of isolate identification.
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5

Real-time PCR Assay for Ureaplasma Detection

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For detection of Ureaplasma sp. DNA, amniotic fluid DNA was analysed using a real-time PCR assay targeting the urease gene of U. parvum and U. urealyticum as described by Yi et al.
[29 (link)], adapted for use on a ViiA7 real-time PCR thermocycler (Life Technologies, Carlsbad, California, USA). Reaction mixtures (final volume or concentration) consisted of: 1X Taqman FAST Advanced Master Mix (Life Technologies), 0.9 μM primers UU1613F and UU1524R (Life Technologies), 0.25 μM probes UU-parvo (FAM) and UU-T960 (VIC) (Life Technologies), 5 μL of template DNA and nuclease-free water (Ambion) to a final volume of 20 μL. PCR cycling conditions consisted of an initial denaturation/Taq activation at 95°C for 20 s, followed by 40 quantification cycles of 95°C for 1 s and 60°C for 20 s (data acquiring).
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6

Quantitative Detection of Ureaplasma spp.

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Payne et al. [25] had already established species-level identification of UK triple-cloned isolates. For the Australian isolates, to determine whether the triple-cloned Ureaplasma spp. were either U. parvum or U. urealyticum, a real-time PCR assay targeting the urease gene of these species as described by Yi et al. [29] , adapted for use on a ViiA7 real-time PCR thermocycler (Life Technologies, Carlsbad, California, USA), was used. Reaction mixtures (final volume or concentration) consisted of: 1X Taqman FAST Advanced Master Mix (Life Technologies), 0.9 µM primers UU1613F and UU1524R (Life Technologies), 0.25 µM probes UU-parvo (FAM) and UU-T960 (VIC) (Life Technologies), 5 µL of template DNA and nuclease-free water (Ambion) to a final volume of 20 µL. PCR cycling conditions consisted of an initial denaturation/Taq activation at 95 o C for 20 s, followed by 40 quantification cycles of 95°C for 1 s and 60°C for 20 s (data acquiring).
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