The nutritional requirements of Lactobacillus bifidus and Lactobacillus leichmannii.

The minimal nutritional requirements of Lactobacillus bifidus.

The microbiologic flora of the intestine of the breast-fed infant is characterized by the predominance of Lactobacillus bifidus. Investigations of the factors responsible for the establishment of this organism in the intestine of the nursling have been hampered by the lack of suitable isolation and cultivation procedures. Recently Norris et al. (1950) described a semisynthetic medium, supplemen...

Influence of the amino acids of synthetic media upon the response of Lactobacillus leichmannii to vitamin B12.

The growth response of Lactobacillus leichmannii to vitamin B12 has been studied extensively. Investigators have used semisynthetic media (Skeggs et al., 1950; Lees and Toothill, 1952) or basal media supplemented with tomato juice or liver extracts (Peeler et al., 1949; Schweigert et al., 1950). Recently Skeggs and her associates (1953) prepared a synthetic medium and studied the nutritional re...

The characteristics of some rumen lactobacilli.

During the past few years several investigators have reported the isolation of lactobacilli or lactobacilli-like organisms from the rumen liquor of cattle and sheep. Gall and Huhtanen (1951) isolated several gram positive, nonsporeforming rods from rumen fluid which produced lactic acid from glucose, but they were not further identified. Some lactobacilli found by Rodwell (1953) in a sheep's ru...

Purine and pyrimidine requirements of Lactobacillus leichmannii in the presence of vitamin B12 or thymidine.

The nutrition of variants of Lactobacillus bifidus.

The bacterial flora of the intestine of an infant that is being fed human milk is characterized by the predominance of a lactobacillus whose distinctive morphology of rods, clubs, and bifid forms has given it the name of Lactobacitlus biJidus (l-3). The possible importance of this intestinal organism to the health of the infant makes its study one of practical significance. Since its discovery ...