2) Preparation of solutions of enzyme
Disolve X g sample (at least 1.0 g) in 250 ml BB9 buffer. Stir for 20 min. Dilute further with BB6 buffer IN ORDER TO END UP WITH AN ENZYME ACTIVITY TARGET BETWEEN 0.1 AND 0.45 npu(s)/ml

i cannot translate the part in capital letters (особенно смущает TARGET)

Please, help)

yours,
Chilli