PCR amplifications were performed in 0.5 ml PCR tube. The reaction mixture
consisted of bacterial DNA−10 ng, forward and reverse primers−1.5 μl each, 10 Taq
reaction buffer−10.0 μl, Taq polymerase−5 units, 5 mM dNTPs mix−2.0 μl and distilled
water—to make 100 μl. PCR-amplification was accomplished in a programmable DNA
thermocycler (Mastercycler Gradient- eppendorf™) using the following PCR program:
95 1C for 5 min, (95 1C for 1 min, 53 1C for 2 min, 72 1C for 2 min) 28 cycles, 72 1C for
5 min and stored at 4 1C. 10 μl aliquot from the PCR amplification product was resolved
by horizontal agarose gel electrophoresis using 0.7 per cent (w/v) agarose gel
(supplemented with ethidium bromide @ 1.0 mg l−1
) in TAE buffer. For this purpose,
10 μl of PCR product was mixed with 2 μl of 6 ‘gel loading buffer’ (0.25%
bromophenol blue−0.25% xylene cyanol–30% glycerol in water) and mixture was
loaded into the wells of agarose gel. The gel was subjected to electrophoresis at
constant voltage (75 V) for 1 h. The molecular size of the amplified products in the gel
were visualized under UV-transilluminator (using low intensity of UV light) and
recorded with a Gel documentation system (Ultra cam). Size of amplified bands was
ascertained by co-running a molecular weight standard (100 bp DNA ladder plus,
Fermentas Life Sciences) along with the samples in the gel.
PCR amplifications were performed in 0.5 ml PCR tube. The reaction mixtureconsisted of bacterial DNA−10 ng, forward and reverse primers−1.5 μl each, 10 Taqreaction buffer−10.0 μl, Taq polymerase−5 units, 5 mM dNTPs mix−2.0 μl and distilledwater—to make 100 μl. PCR-amplification was accomplished in a programmable DNAthermocycler (Mastercycler Gradient- eppendorf™) using the following PCR program:95 1C for 5 min, (95 1C for 1 min, 53 1C for 2 min, 72 1C for 2 min) 28 cycles, 72 1C for5 min and stored at 4 1C. 10 μl aliquot from the PCR amplification product was resolvedby horizontal agarose gel electrophoresis using 0.7 per cent (w/v) agarose gel(supplemented with ethidium bromide @ 1.0 mg l−1) in TAE buffer. For this purpose,10 μl of PCR product was mixed with 2 μl of 6 ‘gel loading buffer’ (0.25%bromophenol blue−0.25% xylene cyanol–30% glycerol in water) and mixture wasloaded into the wells of agarose gel. The gel was subjected to electrophoresis atconstant voltage (75 V) for 1 h. The molecular size of the amplified products in the gelwere visualized under UV-transilluminator (using low intensity of UV light) andrecorded with a Gel documentation system (Ultra cam). Size of amplified bands wasascertained by co-running a molecular weight standard (100 bp DNA ladder plus,Fermentas Life Sciences) along with the samples in the gel.
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