Objective:To explore a simple and reliable technique to keep positive DNA controls.

目的：探索能获得阳性DNA对照的简便可靠的方法。

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Methods HBV genotypes were detected by polymerase chain reaction (PCR) and restriction fragment length polymorphism analysis (RFLP) in 136 HBV DNA positive patients who were born in Shanghai.

方法采用聚合酶链反应-限制性片段长度多态性分析(PCR - RFLP)检测136例HBV DNA阳性的上海籍HBV感染者的基因型。

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Objective: To identify positive clones from DNA recombinants rapidly.

目的：从DNA重组体中快速鉴定出阳性克隆。

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Although none tested positive for horse DNA, some own-brand meatballs were found to contain traces of pork.

BBC: Iceland boss blames councils over 'poor meat quality'

The Asda product was tested as part of an industry-wide programme and found to be positive for horse DNA above 1%.

BBC: Veterinary drug found in Asda budget corned beef

The FSA also said that late last month a burger from hotel chain Whitbread had tested positive for horse DNA above 1%.

BBC: Horse DNA found in two takeaway burgers, FSA says