For the detection of MBV, the nested PCR primers and protocol described by Belcher &
Young (1998) were employed. A nested PCR protocol (Hossain et al. 2001) was also used for WSSV detection. PCR was carried out in a 30 µl reaction mixture consisting of: 1 × PCR buffer; 5 pmol of each primer for HPV and WSSV, and 10 pmol of each primer for MBV; 50 µM each of dATP, dCTP, dGTP and dTTP; 0.9 U of Taq DNA polymerase; and 2 µl of DNA extract. Total DNA extracted from shrimp showing histopathological changes characteristic of WSSV, MBV and HPV were used as templates for positive controls, and DNA extracted from healthy freshwater fish Labeo rohita was used as the template for the negative control. Amplification was carried out in a thermocycler (M. J. Research). The amplified PCR products were electrophoresed in a 1.2% agarose gel containing 0.5 µg ml–1 ethidium bromide, and visualized with a UVtransilluminator (Gel doc system, Hero Lab).
For the detection of MBV, the nested PCR primers and protocol described by Belcher &Young (1998) were employed. A nested PCR protocol (Hossain et al. 2001) was also used for WSSV detection. PCR was carried out in a 30 µl reaction mixture consisting of: 1 × PCR buffer; 5 pmol of each primer for HPV and WSSV, and 10 pmol of each primer for MBV; 50 µM each of dATP, dCTP, dGTP and dTTP; 0.9 U of Taq DNA polymerase; and 2 µl of DNA extract. Total DNA extracted from shrimp showing histopathological changes characteristic of WSSV, MBV and HPV were used as templates for positive controls, and DNA extracted from healthy freshwater fish Labeo rohita was used as the template for the negative control. Amplification was carried out in a thermocycler (M. J. Research). The amplified PCR products were electrophoresed in a 1.2% agarose gel containing 0.5 µg ml–1 ethidium bromide, and visualized with a UVtransilluminator (Gel doc system, Hero Lab).
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