TABLE 1.

Growth characteristics and β-galactosidase and proteinase activities of L. helveticus CRL 1062 and its slowly milk-coagulating variant S1

Strain	Growtha			Sp act (mean ± SD)
	RSM	RSM-G	RSM-YE	β-Galactosidaseb	Proteinasec
CRL 1062	+	+	+	6.6 ± 0.2	6.1 ± 0.2
S1	−	−	+	6.5 ± 0.3	6.2 ± 0.2

^aStrains were inoculated (2%) into the indicated media and incubated for 16 h at 42°C. Growth was monitored as milk coagulation (+). 

^bMicromoles of ONP liberated per microgram of protein per minute at 42°C. 

^cNanomoles minute⁻¹ milligram of protein⁻¹. The lactate dehydrogenase activity was less than 0.06% of the total activity in each cell extract.