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T Schenk

Publications and source records attributed to T Schenk.

42 records · Page 3Linked to original sources
PubMed1991

[Peculiarities of occupational health vibration measurements of manually controlled banging machines].

Specific problems of the measurement of mechanical vibrations on the grips of hand-held tools are discussed in this paper. Especially the measurement on percussive-typ tools, e.g. pneumatic hammers, percussive drills and others, is focussed. The possibilities of affecting the measuring results because of mistakes in the measurement procedure and because of technological peculiarities of the working process are explained and hints for minimizing these influences are given.

Bone Diseases↗
PubMed1990

Mechanism of enzymatic dehalogenation of pentachlorophenol by Arthrobacter sp. strain ATCC 33790.

Pentachlorophenol (PCP) dehalogenase from Arthrobacter sp. strain ATCC 33790 converts PCP to tetrachlorohydroquinone. In labeling experiments with H(2)18O or 18O2, only with H(2)18O was labeled product found. However, unlabeled tetrachlorohydroquinone became labeled after incubation with the enzyme in H(2)18O. Therefore, distinction between an oxygenolytic or a hydrolytic dehalogenation mechanism for the PCP dehalogenase is not possible.

Arthrobacter↗
PubMed1989

Enzymatic dehalogenation of pentachlorophenol by extracts from Arthrobacter sp. strain ATCC 33790.

Arthrobacter sp. strain ATCC 33790 was grown with pentachlorophenol (PCP) as the sole source of carbon and energy. Crude extracts, which were prepared by disruption of the bacteria with a French pressure cell, showed no dehalogenating activity with PCP as the substrate. After sucrose density ultracentrifugation of the crude extract at 145,000 x g, various layers were found in the gradient. One yellow layer showed enzymatic conversion of PCP. One chloride ion was released per molecule of PCP. The product of the enzymatic conversion was tetrachlorohydroquinone. NADPH and oxygen were essential for this reaction. EDTA stimulated the enzymatic activity by 67%. The optimum pH for the enzyme activity was 7.5, and the temperature optimum was 25 degrees C. Enzymatic activity was also detected with 2,4,5-trichlorophenol, 2,3,4-trichlorophenol, 2,4,6-trichlorophenol, and 2,3,4,5-tetrachlorophenol as substrates, whereas 3,4,5-trichlorophenol, 2,4-dichlorophenol, 3,4-dichlorophenol, and 4-chlorophenol did not serve as substrates.

Arthrobacter↗
PubMedDate not supplied

Arterial hepatic embolization of unresectable hepatocellular carcinoma using a cyanoacrylate/lipiodol mixture.

PURPOSE: A survival analysis in 16 patients with unresectable hepatocellular carcinoma (HCC) undergoing transcatheter arterial embolization (TAE) using a combination of lipiodol and N-butyl-2-cyanoacrylate (5:1) was performed in a retrospective study. METHODS: A combination of lipiodol and N-butyl-2-cyanoacrylate (5:1) was used for TAE. All patients had disease compatible with Okuda stages I and II. RESULTS: Twenty-four embolizations were done; five patients had more than one embolization. Median alpha-fetoprotein levels declined from 116 to 48.6 ng/ml. A median of 0.3 ml cyanoacrylate was administered per patient. Median survival was 8.5 months (range 2-49 months). After a median follow-up of 4 years, 12 patients have died (75%). Okuda stage I and II patients had a median survival time of 34.4 and 5.5 months respectively. Few side effects (19%) were seen. CONCLUSION: We conclude that the TAE procedure used [lipiodol and N-butyl-2-cyanoacrylate (5:1)] is safe and produced only few side effects, thus constituting a valuable therapeutic option for patients with Okuda stage I and II HCC.

Aged↗