Horst Völker

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A novel thermophilic, hydrogen-oxidizing bacterium, VM1T, has been isolated from a marine hydrothermal area of Vulcano Island, Italy. Cells of the strain were gram-negative rods, 2-4 microm long and 1-1.5 microm wide with four to seven monopolarly inserted flagella. Cells grew chemolithoautotrophically under an atmosphere of H2/CO2 (80:20) in the presence(More)
A novel thermophilic hydrogen-oxidizing bacterium, Hydrogenophilus hirschii Yel5aT (= DSM 11420T = JCM 10831T) has been isolated from the Angel Terrace Spring, Yellowstone National Park. The isolate was rod-shaped (1.0-1.5 x 0.8 microm) with a polarly inserted flagellum. Cells grew chemolithoautotrophically under an atmosphere of H2 and CO2 (80:20) in the(More)
A spore-forming, halophilic bacterium was isolated from surface sediment located on the beach of Palaeochori Bay near to a shallow water hydrothermal vent area, Milos, Greece. The bacterium, designated SH 714T, consisted of motile, strictly aerobic rods which contained an Orn-D-Glu type murein and a G+C content of 35 mol%. Thin sections showed a cell wall(More)
Two novel, hyperthermophilic, anaerobic, heterotrophic archaea were isolated from shallow hydrothermal vents off Palaeochori Bay, Milos, Greece. Strain P5T (BK17S6-3-b2T) is an irregular coccus, with a single polar flagellum, growing optimally at 90 degrees C, pH 6 and 2% NaCl. The DNA G+C content was 45 mol%. Due to its morphology, phylogenetic analyses(More)
A novel methanogen, Methanosarcina baltica GS1-AT, DSM 14042, JCM 11281, was isolated from sediment at a depth of 241 m in the Gotland Deep of the Baltic Sea. Cells were irregular, monopolar monotrichous flagellated cocci 1.5–3 µm in diameter often occurring in pairs or tetrads. The catabolic substrates used included methanol, methylated amines, and(More)
Naturally grown cell material of Crenothrix polyspora from the well of a waterworks was studied by means of phase-contrast and Nomarski interference microscopy as well as by transmission electron microscopy. The material consisted of clusters of sheathed filaments up to 2 cm long. Propagation forms observed were nonmotile, spherical cells that arose by(More)
Isolation of a Hyphomicrobium phage from raw sewage from Athens, Ohio, was achieved by a combination of differential centrifugation, filtration, enrichment in mixed Hyphomicrobium cultures, and purification on individual host strains by subculturing single plaques in soft agar overlayers. Enrichments with water from Lake Erie and Lake Beechwood (Ohio) were(More)
Se-Ax is a continuous mature T-cell line that we have established from a patient with Sézary's syndrome. An important finding was that the Se-Ax cell line required human serum for initial growth. Here we show that transfer of the permanent cell line to a medium deficient of human serum induces production of C-type retroviral-like particles with a unique(More)
A new hyperthermophilic, strictly anaerobic crenarchaeote, Stetteria hydrogenophila DSM11227 representing a new genus within the family of Desulfurococcaceae, was isolated from the sediment of a marine hydrothermal system at Paleohori Bay in Milos, Greece. Cells are gram-negative irregular and disc-shaped cocci, 0.5–1.5 μm in diameter, which are flagellate(More)
Fifty-five lytic bacteriophages isolated from water and soil samples were active on many strains of the genus Hyphomicrobium. The optimal isolation procedure was an adsorption method in which samples from a habitat similar to that of the respective host bacterium were used as the phage inoculum. According to the morphology and nucleic acid type these(More)