Sentence:  Hydrolysis of the substrate was measured by a <WSD>microformal</WSD> titration, by using 0.05N sodium hydroxide, a manostat microtitrator, and a Beckman Zeromatic pH meter to determine the micromoles of acid liberated in a given time. 
Meaning of the word marked with <WSD> tags:  Involving substances in which extremely small volumes are involved (such as antibiotics, antibodies or viruses).