Marit Steine Madsen

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Rod-shaped, thermophilic bacteria with a sheath-like outer structure (toga) were isolated from hot oilfield water of a North Sea oil reservoir. One of the isolates, designated SJ95(T), is an obligately anaerobic, sheathed, Gram-negative, fermentative bacterium capable of reducing elemental sulfur to hydrogen sulfide and tolerating high salt concentrations.(More)
Molecular and culture-based methods were used to investigate the microbial diversity in produced water obtained from the high-temperature Troll oil formation in the North Sea. 16S rRNA gene libraries were generated from total community DNA, using universal archaeal or bacterial oligonucleotide primer sets. Sequence analysis of 88 clones in the bacterial(More)
When bacteria contain two chromosomes, two or more copies of the same gene are present in the same cytoplasm and, if these copies are subject to negative regulation in trans and positive (autocatalytic) regulation in cis, one copy will be expressed at the expense of the other copy(ies). This autocatalytic process depends on the coupled transcription, or(More)
A mesophilic, Gram-negative, rod-shaped, marine, propionate-oxidizing sulfate reducer (strain M16T) was isolated from a water-oil separation system on a North Sea oil platform. The optimum conditions for growth were 31 degrees C, pH 6.8-7.2 and 1.5-2.0% (w/v) NaCl and 0.1-0.3% (w/v) MgCl2.6H2O in the medium. The growth yield with sulfate was 4.6 g cell(More)
NADP(+)-specific isocitrate dehydrogenase (EC 1.1.1.42) was purified to homogeneity from the sulfate-reducing bacterium Desulfobacter vibrioformis, and shown to be a monomeric protein with a molecular mass of 80 kDa. The pH and temperature optima were 8.5 and 45 degrees C, respectively. The N-terminal amino acid sequence (Thr, Glu, Thr, Ile, Arg, Trp, Thr,(More)
The role of Asp-328 and Ile-329 as a cofactor discrimination site of the NAD-dependent isocitrate dehydrognase (NAD-IDH) from Pyrococcus furiosus has been verified by replacing these residues with Lys and Tyr, respectively, which are the corresponding residues in NADP-IDH from Escherichia coli. The Asp-328–Lys mutant showed dual coenzyme specificity,(More)
To discover a unifying theory of biology, it is necessary first to believe in its existence and second to seek its elements. Such a theory would explain the regulation of the cell cycle, differentiation and the origin of life. Some elements of the theory may be obtained by considering both eukaryotic and prokaryotic cell cycles. These elements include(More)
A culture-independent study of the bacterial diversity in Lake Dhanmondi, located in the central region of Dhaka city, Bangladesh, was carried out using deep sequence analysis of 16S rRNA gene PCR amplicons. The results revealed the presence of a group of bacteria, termed LD11, phylogenetically unrelated to any previously cultivated bacteria at the phylum(More)
Antiviruses are designed to inhibit virus replication and arrest infections. A particular antivirus derives from a specific virus, on which it depends for propagation. Antiviruses have a natural equivalent in defective interfering particles (DIPs). To obtain design criteria for antiviruses, antivirus therapies for treating virus infections are modelled by a(More)