[gamma-Glutamyl-transferase activity in the family "Neisseriaceae" (author's transl)].

Members of the family Neisseriaceae (554 strains) were screened for gamma-glutamyl-transferase (gamma GT) activity. gamma GT was produced by Neisseria meningitidis but not produced by any strain of N. gonorrhoeae, N.

[Utilization and fermentation of 2-ketogluconate by "Enterobacteriaceae" (author's transl)].

Two methods were compared: 1) the ability to use 2-ketogluconate (2-KG) as source of carbon and energy in defined medium, and 2) the ability to produce acid by fermentation of 2-KG (0.5 g/100 ml) in peptone water with phenol red. Results of growth on, and acid production from, 2-KG were identical.

[Hydrolysis of tributyrin by species of "Neisseria" and "Branhamella" (author's transl)].

A comparative study of 60 strains of Neisseriaceae was done using 4 different substrates: tween 20, tween 80, tributyrin and naphthylmyristate. Production of butyric acid from tributyrin was measured by gas chromatography. Strains of the genus Branhamella produced large amounts of butyric acid, whereas strains of the genus Neisseria produced little amounts.

[gamma Glutamyltransferase activity in the genus "Yersinia" (author's transl)].

The expression of gamma-glutamyltransferase activity was studied among 87 strains representing all the Yersinia species. Y. pestis lacked constantly this enzyme, while y.