THE MICROBIOLOGICAL ANALYSIS OF SEVEN AMINO ACIDS WITH LACTOBACILLUS CASEI

The microbiological assay of 'streptogenin' with Lactobacillus casei.

Degradation of amino acids by Lactobacillus casei and some factors influencing deamination of serine.

Lactose is the usual source of energy for multiplication of Lactobacillus casei (Orla-Jensen, Holland) in milk, but when milk is made into cheese the lactose content usually is depleted within a few days. Even then, in such cheese as Cheddar, lactobacilli may continue to increase in numbers until 6 to 12 months after the cheese is made, thus demonstrating the ability of these organisms to utili...

The Microbiological Determination of Amino Acids

After the development of methods for the determination of valine, leucine, and isoleucine (1) with LactobacilEus arabinosus 17-5 as the test organism, it was assumed that other amino acids essential for the growth of this organism could be determined by about the same procedure. However, it was soon discovered that glutamic acid is unique in its relationship to the growth of Lactobacillus arabi...

The measurement of serum pyridoxal by a microbiological assay using Lactobacillus casei.

A new method has been developed for the assay of serum pyridoxal using L. casei. Bound pyridoxal phosphate in serum is converted by acid hydrolysis to pyridoxal for which this organism is specific. This method proved to be considerably more sensitive than other methods so far reported in the literature. Serum pyridoxal concentrations were measured in 151 control subjects aged 17 to 80 years. Th...

Cell surface characteristics of Lactobacillus casei subsp. casei, Lactobacillus paracasei subsp. paracasei, and Lactobacillus rhamnosus strains.

Hydrophilic and electrostatic cell surface properties of eight Lactobacillus strains were characterized by using the microbial adhesion to solvents method and microelectrophoresis, respectively. All strains appeared relatively hydrophilic. The strong microbial adhesion to chloroform, an acidic solvent, in comparison with microbial adhesion to hexadecane, an apolar n-alkane, demonstrated the par...