How can contaminants in DNA and RNA samples affect absorbance at 260 and concentration results?
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How can contaminants in DNA and RNA samples affect absorbance at 260 and concentration results?
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- what is the dna concentration suspended in PO4 buffer at ph 7.0 that has an absorbance at 260 nm equal to 1.0?A 2.5mg/ml solution of ampicillin is available for use, what volume would youadd to 200ml of LB medium to obtain a final concentration of 50µg/ml ofampicillin?Why does water separate out from a gel after freezing?
- In a mixture of five proteins listed, draw an elution profile (Absorbance vs. mL eluted, arbitrary) for the purification of the listed proteins on a gel filtration chromatography resin: cytochrome c (pI = 5.4; Mr = 13,000), immunoglobulin G (pI = 7.3; Mr = 145,000), ribonuclease A (pI = 9.6; Mr = 13,700), RNA polymerase (pI = 6.3; Mr = 450,000), human serum albumin (pI = 5.4; Mr = 68,500). Label your elution peaks. Draw a sketch of an SDS-PAGE, reflecting the mobility of the above mixture as they elute from the column. Label you protein bands.You have a 20 mg/mL stock solution of the amino acid arginine and need to make plates containing arginine at a concentration of 10 micrograms/mL. How much of the stock solution do you add to 1 liter of plate media?Of the components in the hydrogels beads, which is the protein we are interested in measuring?