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1	Author	Friedrich Mönkehaus	Requires cookie*
	Title
	Abstract	/-Phages with different amounts of BU in their DNA-strands were irradiated with long wave length UV light (302/313 nm) and short wavelength UV-light (254 nm) in the presence and ab sence of cysteamine. It was found that the dose reduction factor is dependent on the percentage BU-substitution only after irradiation with UV-light of 254 nm, not after long wavelength UV-irradiation. Furthermore, the inactivation cross section is proportional to the BU-content of the D N A after irradiation with long and with short wavelength UV-light in the presence of cysteamine. The results lead to the conclusion that the presence of cysteamine inhibits energy transfer pro cesses which occur after irradiation with UV-light of 254 nm in the absence of cysteamine. Einfluß von Cysteamin auf die UV-Empnndlichkeit von X-Phagen mit variablem Bromuracil-Gehalt I. Einleitung
	Reference	(Z. Naturforsch. 29c, 286 [1974]; eingegangen am 14. Dezember 1973)
	Published	1974
	Keywords	Cysteamine, UV-Sensitivity, A-Phages, Bromouracil, Energy-transfer
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	TEI-XML for	default:Reihe_C/29/ZNC-1974-29c-0286.pdf
	Identifier	ZNC-1974-29c-0286
	Volume	29

2	Author	Friedrich Mönkehaus	Requires cookie*
	Title	UV-Empfindlichkeit von >*-Phagen mit variablem Bromuracil-Gehalt UV-Sensitivity of /-Phages with Various BU-Contents
	Abstract	Heat induction of E. coli CR 34 (Acl857)/A growing in media with variing bromouracil (BU)-contents yielded A-phages with different amounts of BU in their DNA-strands. The percentage sub stitution of thymine was determined by buoyant density measurements in a CsCl-density gradient. After irradiation of the phages with long wavelength UV (302/313 nm) and short wavelength UV (254 nm) the sensitivity (loss of infectivity) was determined as a function of the degree of BU-substitution. It was found that after irradiation with long wavelength UV the cross section is proportional to the percentage BU-substitution, whereas after irradiation with short wavelength UV it is not. The results can be explained by assuming energy transfer from the four DNA-bases to the BU.
	Reference	(Z. Naturforsch. 29c, 289 [1974]; eingegangen am 14. Dezember 1973/19. Februar 1974)
	Published	1974
	Keywords	UV-Sensitivity, A-Phages, Bromouracil, Energy-transfer
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	TEI-XML for	default:Reihe_C/29/ZNC-1974-29c-0289.pdf
	Identifier	ZNC-1974-29c-0289
	Volume	29

3	Author	Pavel Balgavý, Robert Turek	Requires cookie*
	Title	Inhibition of Excision Repair without Influence upon UV-Sensitivity and UV-Mutability in Escherichia coli B/r Hcr +
	Abstract	Pre-irradiation starvation of exponentially growing Escherichia coli B/r Hcr+ thy~trp~ strain for thymine and tryptophan causes inhibition of pyrimidine dimer excision from ultraviolet damaged cells DNA. This inhibition of excision repair has not resulted in increasing ultraviolet sensitivity nor in increasing frequency of ultraviolet induced tryptophan revertants. The possible mechanisms of the non-excision repair in the prestarved cells, which is at least as accurate and effective as the whole dark repair in exponentially growing cells, are discussed.
	Reference	(Z. Naturforsch. 30c, 406 [1975]; received August 1/November 22 1974)
	Published	1975
	Keywords	DNA-Repair, UV-Sensitivity, UV-Mutagenesis, Escherichia coli, UV-Radiation
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	TEI-XML for	default:Reihe_C/30/ZNC-1975-30c-0406.pdf
	Identifier	ZNC-1975-30c-0406
	Volume	30