动物组织DNA的提取及核酸浓度的测定
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DNA concentration is measured by OD260,protein usually is OD280.Some proteins have peak absorbency around 310 nm.Therefore it can be used for judging protein contamination.

EDTA is able to chelate Mg2+ (Magnesium) which is required for most DNase.After Mg2+ is chelated,DNase will not work,this help to preserve DNA..

Sodium acetate and sodium chloride can help to precipitate DNA.

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