We compare three forms of communication and punishment as incentives to increase contributions to public goods in laboratory experiments. We find, as in earlier experiments, that face-to-face Kids Replica Uggs Uk
communication has very strong effects, but surprisingly that verbal communication through a chat room preserving anonymity and excluding facial expression, etc. was almost as efficient. Numerical communication, Cheap Kids Uggs Uk
via computer terminals, had no net effect on contributions or efficiency. Punishment, as in earlier experiments, increased contributions but because of its cost had little net effect on efficiency.
A sensitive assay has been developed for measurement of the esterase activity of kallikrein using p-tosyl-l-arginine-[3H]methyl ester ([3H]TAMe) as substrate. [3H]TAMe is hydrolyzed to yield [3H]methanol which is separated from unhydrolyzed [3H]TAMe by passage of the incubation mixture over a column of carboxylic acid ion exchange resin, which retains the [3H]TAMe while the [3H]methanol passes through and is measured in the effluent. The optimal conditions for the assay and its application to measurement of kallikrein esterase activity in normal human urine are described.