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  • 1
    ISSN: 1432-1173
    Keywords: Schlüsselwörter UV-Schutzfaktor ; Kleidung ; Sonnenschutz ; Prävention ; Key words Fabrics ; Clothes ; Sun protection ; Prevention ; Skin cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A rising incidence worldwide of skin cancer has been observed for years. A high cumulative exposure to UV radiation is a major factor in the development of such neoplasms. Suitable protective measures are therefore becoming increasingly important. Textiles provide simple, effective and medically safe protection against UV radiation. At present, however, in Europe – in contrat to Australia – the UV protection factor (UPF) for summer textiles is not stated. It is a largely unknown fact that by far not all textiles offer sufficient protection. Our goal was to study the factors which determine the UV transmission of fabrics and, based on these findings, to design materials which provide enhanced protection. A spectrophotometric method was used to determine the UV transmission by fabrics made of cotton, silk, polyester and viscose. The UV protection factors of the fabrics were computed on the basis of the transmission data. The UV protection factor is dependent on the type of fibre, yarn and surface design, weight per square metre, moisture content, colour, finishing method and degree of wear. To optimize the UV protection via textiles, a viscose yarn with a low UV transmission was used. This yarn makes it possible to design light-weight summer fabrics with optimized UV protection. This development will make it possible to offer clothing with high UV protection on the European marked. This clothing will not be more expensive than normal products, so that effective prevention should be more available.
    Notes: Zusammenfassung Seit Jahren wird ein weltweiter Anstieg der Hautkrebsinzidenz beobachtet. Eine hohe kumulative UV-Strahlenexposition gilt als ein Hauptfaktor für die Entstehung von Neoplasien der Haut. Geeignete Schutzmaßnahmen gewinnen daher zunehmend an Bedeutung. Textilien bieten eine einfachen und effektiven, medizinisch unbedenklichen Schutz vor der UV-Strahlung, doch wird der UV-Schutzfaktor (USF) von Sommertextilien, z.Z. in Europa – im Gegensatz zu Australien – nicht angegeben.Weitgehend unbekannt ist in diesem Zusammenhang, daß bei weitem nicht alle Textilien einen ausreichenden Schutz bieten. Ziel ist, die Faktoren, welche die UV-Durchlässigkeit von Stoffen bestimmen, zu untersuchen und ausgehend von diesen Ergebnissen Materialien mit verbessertem Schutz zu konstruieren. Die UV-Durchlässigkeit wurde an Geweben aus Baumwolle, Seide, Polyester und Viskose mit einer spektralphotometrischen Methode bestimmt. Die UV-Schutzfaktoren der Stoffe wurden aus den Transmissionsdaten berechnet. Anhand der Ergebnisse konnte gezeigt werden, daß UV-Schutzfaktor von der Faserart, der Garn- und Flächenkonstruktion, dem Quadratmetergewicht, dem Feuchtegehalt, der Färbung, der Ausrüstung und der Abnutzung durch den Gebrauch der Stoffe abhängt. Zur Optimierung des UV-Schutzes durch Stoffe wurde erstmals ein Viskosegarn mit einer extrem geringen UV-Durchlässigkeit eingesetzt. Dieses Garn ermöglicht es, leichte Sommerstoffe mit optimiertem UV-Schutz zu konstruieren. Zukünftig wird es damit möglich sein, Kleidung mit einem hohen UV-Schutzfaktor anzubieten. Diese Kleidung wird nicht teurer sein als normale Produkte, so daß eine hohe Effektivität für unsere Präventionsbemühungen erwartet werden kann.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The phytopathogenic, gram-negative bacterium Pseudomonas syringae pv. syringae 61 contains three isozymes of catalase (EC 1.11.1.6), which have been proposed to play a role in the bacterium's responses to various environmental stresses. To study the role of individual isozymes, the gene coding for the catalytic subunit of one catalase isozyme was cloned from a cosmid library hosted in Escherichia coli DH5α by using a designed catalase-specific DNA probe for the screening. One out of four clones with a catalase-positive genotype was subcloned and a pUC19-based 2.7 × 103-base (2.7-kb) insert subclone, pMK3E5, was used to transform catalase-deficient E. coli strain UM255 (HPI−, HPII−). The transformants contained a single isozyme of catalase that had electrophoretic and enzymic properties similar to catalase isozyme CatF from P. syringae pv. syringae 61. Analysis of the sequenced 2.7-kb insert DNA revealed six putative open-reading frames (ORF). The 1542-base-pair DNA sequence of ORF2, called catF, encodes a peptide of 513 amino acid residues with a calculated molecular mass of 66.6 kDa. The amino acid sequence deduced from catF had homology to the primary structure of true catalases from mammals, plants, yeasts and bacteria. The activity of the recombinant catalase was inhibited by 3-amino-1,2,4-triazole and azide and stimulated by chloramphenicol. The N terminus contained a signal sequence of 26 amino acids necessary for secretion into the periplasm, a so-far unique property of Pseudomonas catalases.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The phytopathogenic, gram-negative bacterium Pseudomonas syringae pv. syringae 61 contains three isozymes of catalase (EC 1.11.1.6), which have been proposed to play a role in the bacterium's responses to various environmental stresses. To study the role of individual isozymes, the gene coding for the catalytic subunit of one catalase isozyme was cloned from a cosmid library hosted in Escherichia coli DH5α by using a designed catalase-specific DNA probe for the screening. One out of four clones with a catalase-positive genotype was subcloned and a pUC19-based 2.7×103–base (2.7-kb) insert subclone, pMK3E5, was used to transform catalase-deficient E. coli strain UM255 (HPI–, HPII–). The transformants contained a single isozyme of catalase that had electrophoretic and enzymic properties similar to catalase isozyme CatF from P. s yringae pv. syringae 61. Analysis of the sequenced 2.7-kb insert DNA revealed six putative open-reading frames (ORF). The 1542-base-pair DNA sequence of ORF2, called catF, encodes a peptide of 513 amino acid residues with a calculated molecular mass of 66.6 kDa. The amino acid sequence deduced from catF had homology to the primary structure of true catalases from mammals, plants, yeasts and bacteria. The activity of the recombinant catalase was inhibited by 3-amino-1,2,4-triazole and azide and stimulated by chloramphenicol. The N terminus contained a signal sequence of 26 amino acids necessary for secretion into the periplasm, a so-far unique property of Pseudomonas catalases.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 26 (1996), S. 49-62 
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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