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Excision of Tn917 from chromosomal sites in B. subtilis is characterized by reversion studies. We propose different modes of excision depending on the site of transposon insertion. Excision takes place as precise excision in one step which results in reversion of the mutant phenotype, or by a...
Forty‐eight species of wood‐destroying basidiomycetous fungi which are represented by 74 strains were examined for their dependence on exogenous vitamin sources such as thiamine and biotin. In a series of up to 11 consecutive transfers to vitamin‐free glucose‐salt medium batches in a 4‐week...
The presence of the essential growth factor thiamine in timber was ascertained with the determination of the mycelial growth figures of several indicator fungi on the respective timber substrates. The behaviour of the absolutely thiamine‐dependent phycomycete, Phycomyces blakesleeanus BURGEFF...
Growth of Escherichia coli 044 K 74 in liquid medium of raised osmotic strength was stimulated by exogenous L‐carnitine, crotonobetaine and γ‐butyrobetaine, respectively. L‐Carnitine was accumulated within the cells in dependence on the salt concentration of the media. Osmotic stress during...
Fifteen nocardioform bacteria strains, capable of transforming steroid compounds were investigated with regard to their range of inducible steroid‐1‐dehydrogenase (St1DH)1 activities. The St1DHs of these bacteria were compared due to their immuno reactivity in Western blot experiments with a...
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