Let p be an odd prime, s,m be positive integers and Fpm be the finite field with p m elements. In this paper, we determine all constacyclic codes of length 4p over the finite commutative chain ring R = Fpm + uFpm with unity, where u 2 = 0. We also determine their dual codes and list some isodual constacyclic codes of length 4p over R.

The bifunctional reagent, p,p’-difluoro-m,m’-dinitrodiphenyl sulfone, was employed to conjugate a variety of amino acids to the protein, gelatin. Among the amino acids tried, tyrosine conjugated most readily. The tyrosyl derivative of gelatin was characterized by electrophoretic, ultracentrifugal, and spectral studies. The conjugation of tyrosine to gelatin appeared to take place through the ph...