11 November 2015 0 5K Report

Hello every one

I want to double digest p35S-FAST Plasmid with Kpn1 and BamH1 1X tango buffer.. The "Double Digest Calculator-Thermo Scientific" recommends the following condition.

1X Tango buffer

4-fold excess of KpnI

BamHI

Incubate at 37°C.

I want to know that what does it mean "4-fold excess of KpnI

BamHI".i.e  In a total volume of 50ul reaction, the Kpn1 will be 4 fold in excess to BamH1 or BamH1 will be 4 fold in excess to Kpn1.?..

Also please suggest me that for double digestion i should use 50ul reaction volume or 20ul volume.?. 

Please do not mind because the question is simple but i am really confused...

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