A ROUTINE DETERMINATION OF THE OPTICALLY ACTIVE ISOMERS OF LACTIC ACID FOR BACTERIAL CLASSIFICATION.
The quantity of L(+)-isomer of lactic acid is determined with L(+)-specific lactic dehydrogenase. Comparison with the total amount of lactic acid determined chromatographically is used as a rapid and accurate replacement for the classical determination of optically active isomers of lactic acid for classification of lactic acid bacteria.
CATALASE-PRODUCING STRAINS OF STREPTOCOCCI
The genus Streptococcus includes organisms which are homofermentative, facultative with respect to oxygen, fastidious in their nutrient requirements, without cytochrome system, and are therefore considered to be catalase negative. Recent work in this laboratory revealed two strains of several hundred streptococci, screened from silage fermentations, that were capable of producing catalase. They appeared to be closely related to Streptococcus faecalis var. liquefaciens. The work reported here describes the cultural, morphological, and physiological characteristics of the catalase-producing isolates.
The effect of continuous exposure to low frequency electric fields on three generations of mice: A pilot study
Mice were allowed to mate, gestate, deliver and rear their offspring for 3 successive generations while being continuously exposed to 60 Hz electric fields. Mice exposed to vertical electric fields exhibited decreased body weights at 35 days postpartum and increased mortality, rates for 3 successive generations. Mice exposed to horizontal electric fields exhibited decreased body weights for 2 successive generations.