| Comments |
P.2311 right column top paragraph: "Results: Table 1 shows the molar residue refractivities of the different amino acids from McMeekin and colleagues, and the calculated dn/dc [protein refractive index increment] for hypothetical polypeptides from each. Clearly, there are considerable differences in the refractive properties of the amino acids, ranging from dn/dc of 0.165 ml/g for proline to 0.277 ml/g for tryptophan. Amino acids with high polarizability and refractive index increment are those containing aromatic rings, sulfur, or double-bonds in the R-group, the highest ones being tryptophan, phenylalanine, tyrosine, histidine, cysteine, arginine, and methionine (Table 1)." See notes beneath table |