... constant, k, of a catalysed reaction, and the pK of the catalyst:logk = c + bpK, where b and c are constants and the value of b pro-vides a measure of the balance between nucleophilic and generalbase ... series of reactions involved inthe formation of, and mediation of the action of second messengers,e.g. in the activation of glycogen phosphorylase; (3) the process of ac-tivation of steroidogenesis ... half-life of 4.54 days. It emits b–-particles (i.e. elec-trons) of two energy ranges (1.98 and 0.67 MeV max.) and c-radia-tion of three energies (1.31, 0.815, and 0.49 MeV).calcium channel any of...