The occurrence of denitrification in extremely halophilic bacteria

Proteolytic enzymes from extremely halophilic bacteria.

Halobacterium strains produce a truly extracellular proteinase which degrades gelatine and casein. It has a pH optimum of about 8 and depends upon divalent cations and a high concentration of NaCl or KC1 for activity and stability. Proteolytic enzymes were also found in cell homogenates obtained by ultra sonic treatment. A caseinolytic enzyme, probably different from the extracellular one, is a...

The Cell Envelopes of Two Extremely Halophilic Bacteria

The cell envelope of Halobacterium halobium was seen in thin sections of permanganate-fixed cells to consist of one membrane. This membrane appeared mostly as a unit membrane but in a few preparations it resembled a 5-layered compound membrane. The cell envelope of Halobacterium salinarium at high resolution was always seen as a 5-layered structure different in appearance from the apparent comp...

Extremely halophilic bacteria in crystallizer ponds from solar salterns.

It is generally assumed that hypersaline environments with sodium chloride concentrations close to saturation are dominated by halophilic members of the domain Archaea, while Bacteria are not considered to be relevant in this kind of environment. Here, we report the high abundance and growth of a new group of hitherto-uncultured Bacteria in crystallizer ponds (salinity, from 30 to 37%) from mul...

Salt-dependent properties of proteins from extremely halophilic bacteria.

Immunological relationships among some species of extremely halophilic bacteria.

Rabbits were immunized with four strains of halobacteria, Halobacterium halobium NRL, H. halobium R-1, H. salinarium NRL-9, and H. cutirubrum NRL-10, that had been fixed with formaldehyde. The antisera obtained detected the presence of an antigen common to the Halobacterium genus and, after absorption, detected three distinct antigenic groups within the Halobacterium genus. A fourth group was a...