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What is an OD unit?

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What is an OD unit?

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One OD unit, or A260 unit, is that quantity of material which, when dissolved in 1.0 mL of water, and read in a spectrophotometer at 260 nm in a cuvette with a 1.0 cm light path, gives an absorbance of 1.0. An OD unit is roughly equivalent to 30 – 35 ug of DNA.

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