TY  - JOUR 
T1  - Improving selectivity and productivity of the enzymatic synthesis of ampicillin with immobilized penicillin G acylase
JO  - Brazilian Journal of Chemical Engineering
A1  - Ferreira, A. L. O.
A1  - Giordano, R. L. C.
A1  - Giordano, R. C.
SN  - 0104-6632
UL  - 10.1590/S0104-66322004000400002
VL  - 21 
Y1  - 2004
PB  - Brasil 
ER  -