Walter Harm
University of Cologne
12 Papers
634 Citations
Walter Harm is an academic researcher from University of Cologne. The author has contributed to research in topics: Photolyase & Gene. The author has an hindex of 11, co-authored 12 publications.
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Papers
Mutants of phage T4 with increased sensitivity to ultraviolet.
TL;DR: There are now available in phage T4 four sensitivity levels, represented by the genotypes v + x + (wild type), v +x , v x + , and v x , with relative sensitivities of 0.45, 0.75, 1.0, and 2.0; the slopes of the multicomplex survival curves obtained with the different sensitivity types do not show any simple correlation with the slope of the monocomplex survival curve.
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Differential effects of acriflavine and caffeine on various ultraviolet-irradiated Escherichia coli strains and T1 phage.
TL;DR: The possible interpretation that all H CR(−) strains tested exhibit residual repair activity in the absence of acriflavine or caffeine, is supported by the finding that HCR(−), carrying extra UV sensitivity relative to B/r and K12S, respectively, show much greater repair inhibition than the latter strains.
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Analysis of photoenzymatic repair of UV lesions in DNA by single light flashes: II. In vivo studies with Escherichia coli cells and bacteriophage☆
TL;DR: Intracellular complexes of UV lesions in DNA with molecules of photoreactivating enzyme (PRE) in E. coli can be photolysed with a probability close to 1 by single light flashes of about 1 millisecond duration, and a heterogeneity of the photoproducts is evident with regard to both complex formation and stability.
96
On the relationship between host-cell reactivation and UV-reactivation in UV-inactivated phages
Walter Harm
- 01 Jan 1963
TL;DR: The hypothesis is discussed that UVR is not a specific repair phenomenon by itself, but is the result of inhibition of cellular processes tending to decrease the survival.
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The role of host-cell repair in liquid-holding recovery of u.v.-irradiated Escherichia coli.
TL;DR: Evidence is given that liquid‐holding recovery (LHR) of u.v. irradiated E. coli cells involves basically the same type of dark repair which causes reactivation of phage and which results in much increased survival of the cells themselves [host‐cell reactivation (HCR).
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