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Bradford Protein Assay [closed]

Please would somebody help me to solve the following exercise: Determine the protein concentrations of the four unknown samples (A,B,C,D) using the raw data obtained from a Bradford assay. ...
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Are Bovine serum albumin, Avidin, Ficoll-70 and Dextran-70 positively charged or negatively charged?

Bovine serum albumin, Avidin, Ficoll-70 and Dextran-70,are they positively charged or negatively charged ? And which other solvents can be used as a substitute to water for preparing solutions in each ...