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  • 1990-1994  (9)
  • Chemistry  (5)
  • 25.90  (1)
  • 42.60Da  (1)
  • Borrelia burgdorferi  (1)
  • Diabetes mellitus  (1)
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Material
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Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    High power continuous-wave diode-laser-pumped Nd:YAG laser (1994)
    Springer
    Applied physics 58 (1994), S. 389-392 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Rz ; 42.60By ; 42.60Da
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on a diode-laser-pumped cw Nd: YAG laser operating at a power level of 150 W. By using a transverse pump geometry, the radiation of 54 diode lasers with an output power of 10 W each is coupled into a Nd:YAG rod. In multimode operation, an optical slope efficiency of 32% and an optical to optical efficiency of 29% are obtained. In TEM00 operation, an output power of more than 30 W is realized with an optical to optical efficiency of 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081878
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Detection ofBorrelia burgdorferi by nested polymerase chain reaction in cerebrospinal fluid and urine of children with neuroborreliosis (1993)
    Springer
    European journal of pediatrics 152 (1993), S. 414-417 
    Details
    ISSN: 1432-1076
    Keywords: Neuroborreliosis ; Borrelia burgdorferi ; Polymerase chain reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Diagnosis of neuroborreliosis is often difficult since history and clinical presentation may be non-specific and serological tests may initially be negative. We therefore tested the polymerase chain reaction (PCR) for the detection of borrelial sequences in CSF and urine samples of consecutive children with neuroborreliosis seen in a single summer season. Four of eight children were negative in serum for antibodies toBorrelia burgdorferi. Two of eight children were PCR-positive in CSF and one other child was positive in urine. In two out of four children PCR was the only laboratory test confirming the clinical diagnosis. All children recovered after treatment with third generation cephalosporins. When seven of eight children were re-examined 6 months later all were healthy and antibodies toB. burgdorferi were detected in their serum. PCR may assist the paediatrician in establishing a diagnosis of neuroborreliosis; however, a negative result does not rule out neuroborreliosis. PCR is an adjunct, but no substitute for clinical judgement and serology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955900
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Development of height and weight in children with diabetes mellitus: Report on two prospective multicentre studies, one cross-sectional, one longitudinal (1992)
    Springer
    European journal of pediatrics 151 (1992), S. 258-262 
    Details
    ISSN: 1432-1076
    Keywords: Diabetes mellitus ; Growth ; Height ; Weight ; Metabolic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Optimal regimen for insulin therapy should lead to normal longitudinal growth and weight gain in children with diabetes mellitus. However, reports published so far indicate that this goal of paediatric diabetology is currently not achieved in a considerable number of patients. In a cross-sectional sample of 89 children with insulin dependent diabetes mellitus (IDDM) for more than 3 years, we found the relation of height to weight to be significantly different compared to 102 healthy school children of similar age. Using bivariate analysis, body shape in these children with diabetes was shifted towards small and obese (P〈0.05) compared to control children. We subsequently initiated a longitudinal study and followed children from the onset of diabetes for the following 3 years, recording height, weight and bone age as well as glycosylated haemoglobin and daily insulin requirement. At diagnosis, height SDS was identical in children with IDDM (+0.04±0.10) compared to control children (−0.07±0.10; M±SE), while weight SDS was −0.26±0.10 in children with diabetes (controls: +0.01±0.1). Bone age was identically retarded in newly diagnosed IDDM children (−0.73±0.12 SDS) and in our control group of children from the same regional background (−0.50±0.12; n.s.). In this group of children with diabetes mellitus followed prospectively, height to weight relationship differed from controls after 2 and after 3 years of the disease (P〈0.05). At 2 years, body size in children with diabetes was shifted towards taller and heavier compared to controls, while at 3 years, the relation of height to weight was even more abnormal with increased obesity but a reduction of standardized height. This is the same relation encountered in the cross-sectional sample of children with a duration of diabetes beyond 3 years. These data demonstrate that even modern insulin therapy does not guarantee normal development of height and weight in children with IDDM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072224
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of residual nuclei from relativistic ion and antiproton reactions with nuclei (1991)
    Springer
    The European physical journal 341 (1991), S. 79-82 
    Details
    ISSN: 1434-601X
    Keywords: 25.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of residual nuclei after stopped antiproton annihilation in several targets from Cu to Ho has been compared with a recent empirical parametrization of mass and charge yields which is supposed to be valid for relativistic light and heavy ion induced reactions. The basic structure of the proposed formula is also applicable for antiproton induced fragmentation or spallation, but some specific modifications are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281276
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  • 5
    Electronic Resource
    Electronic Resource
    Einfluß von HCl und Cl2 auf die Hochtemperaturkorrosion des 2 1/4 Cr 1 Mo-Stahls in Atmosphären mit hohen Sauerstoffdrücken (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 303-307 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of HCl and Cl2 on high temperature corrosion of 2 1/4Cr 1 Mo Steel in atmospheres with high oxygen pressuresThe oxidation of the 2 1/4 Cr 1 Mo steel was investigated at 773 K in oxidizing He-O2-HCl atmospheres. The addition of HCl to He-O2 atmospheres leads to accelerated oxidation rates. Below porous and cracked oxide scales condensed chlorides are formed. At low HCl pressures 0-1000 vppm the “active oxidation” is determining the corrosion process; i.e. oxidation of evaporating chlorides within the oxide scale. For higher HCl contents 1000-3000 vppm the corrosion behaviour changes to paralinear; i.e. simultaneous parabolic oxide growth and linear mass loss by chloride evaporation.
    Notes: Die Oxidation des 2 1/4Cr1Mo-Stahls in oxidierenden He-O2-HCl-Atmosphären bei 773 K wurde untersucht. Der Zusatz von HCl zu He-O2-Atmosphären führt zu stark beschleunigter Oxidation. Unter porösen und rissigen Oxidschichten bilden sich feste Chloride. Bei niedrigen HCl-Drücken 0-1000 vppm bestimmt „aktive Oxidation“ den Korrosionsprozeß; d.h. Oxidation flüchtiger Chloride innerhalb der Oxidschicht. Bei höheren HCl-Drücken 1000-3000 vppm erfolgt ein Übergang zum paralinearen Korrosionsverhalten, d.h. gleichzeitiges parabolisches Oxidwachstum und lineare Massenabnahme durch das Abdampfen von Chloriden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900410602
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Reinforcement of amorphous thermoplastics by blending with a para-linked aromatic LC-polyester (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 143-150 
    Details
    ISSN: 1042-7147
    Keywords: Reinforcement ; Amorphous ; Matrix ; LC-polyester ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The preparation and the mechanical properties of binary blends of amorphous thermoplastics and a para-linked liquid crystalline polyester, which is expected to act as a reinforcement, are reported. The LC-polyester has the advantage that it is soluble in common organic solvents, that it has a low transition temperature, and that it does not crystallize readily. Polycarbonate, polystyrene, poly(methyl methacrylate), and poly(ether sulfone) were selected as matrix materials. Most of the films cast from the blends turned out to be turbid and thus phase separated, the sizes of the dispersed phases ranging between 0.2 μm (in polycarbonate) and 1 μm (in polystyrene).The LC-polyester causes a substantial increase of the stiffness in blends with polycarbonate, poly(methyl methacrylate), and poly(ether sulfone) and almost no increase in the case of polystyrene. These differences are attributed to the particular magnitudes of the strength of the phase coupling between the matrix and the dispersed phase, which is controlled by their compatibility.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1990.220010204
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Excimer laser micromachining (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 2 (1993), S. 87-92 
    Details
    ISSN: 1057-9257
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The machining of several materials such as polymers, metals and ceramics using excimer lasers (193, 248 and 308 nm) was investigated. By photoablation, micrometer resolution can be achieved for polymers if the wavelength and fluence are chosen properly. High-definition processing of metals is complicated by the occurrence of surface melting. An interaction between the ablation plume and the walls of the laser-drilled holes leads to hole widening in the case of polymers at high fluences. For small structures (〈100 μm) all materials investigated show a size-dependent ablation rate. This effect has to be taken into account if a precise ablation depth is required for a pattern with structures of different sizes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860020111
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Enzyme chronopotentiometry (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 543-552 
    Details
    ISSN: 1040-0397
    Keywords: Chronopotentiometry ; Enzyme electrode ; Biosensors ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chronopotentiometry (CP) with enzyme electrodes is a new approach to overcome inherent problems of steady-state potentiometric processes. The developed procedure is presented on the example of a glucose oxidase (GOD) electrode. Electrochemically generated mediator helps to overcome traditional difficulties arising from poorly defined mixed potentials in the presence of oxygen during an analysis. Transition times are automatically evaluated by using computerized calculation programs. The technique can be used for determining substrate concentrations; moreover, it is particularly promising as an effective tool to study electrode processes with biochemical systems on an electrode surface.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060703
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung und Charakterisierung von Selenverbindungen mit dem 2,4,6-Tris(trifluormethyl)phenyl-SubstituentenProfessor Dietrich Babel zum 60. Geburtstage am 28. Juli 1990 gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 586 (1990), S. 7-18 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Characterization of Selenium Compounds with the 2,4,6-tris(trifluoromethyl)phenyl SubstituentReaction of 2,4,6-tris(trifluoromethyl)phenyl lithium and red selenium results in a product which by acidic hydrolysis yields bis[2,4,6-tris(trifluoromethyl)phenyl] diselenide 1. With diazomethane this compound reacts to form bis[2,4,6-tris(trifluoromethyl)phenylselenenyl] methane 2, with bis(triphenylphosphine)ethene platinum(0) the corresponding bis(triphenylphosphine)bis-[2,4,6-tris(trifluoromethyl)phenylselenenyl] platinum(II) 3 is formed. Chlorine and bromine cleave the selenium-selenium bond in 1 and 2,4,6-tris(trifluoromethyl)phenylselenenyl chloride 4 and -bromide 5 are formed. The selenenyl halides are starting materials for the preparation of N,N′-bis-[2,4,6-tris(trifluoromethyl)phenylselenenyl] sulfur(IV) diimide 6 and sulfinylimino-2,4,6-tris(trifluoromethyl)phenyl selenide 7. The X-ray structures of 1 and 7 are discussed.
    Notes: Durch Reaktion von 2,4,6-Tris(trifluormethyl)phenyllithium mit rotem Selen und anschließender saurer Hydrolyse des Reaktionsprodukts bildet sich Bis[2,4,6-tris(trifluormethyl)phenyl]diselenid 1. Mit Diazomethan reagiert diese Verbindung zu Bis[2,4,6-tris(trifluormethyl)phenylselenenyl]methan 2, mit Ethen-bis(triphenylphosphan)-platin(0) entsteht Bis[2,4,6-tris(trifluormethyl)phenylselenenyl]bis(triphenylphosphan) platin(II) 3. Chlor und Brom spalten die Selen-Selen Bindung in 1 unter Bildung von 2,4,6-Tris(trifluormethyl)phenylselenenylchlorid 4 und -bromid 5. Die Selenenylhalogenide sind Ausgangsstoffe für N,N′-Bis[2,4,6-tris(trifluormethyl)phenyl-selenenyl]schwefel(IV)-diimid 6 und Sulfinylimino-2,4,6-tris(trifluormethyl)phenyl-selenid 7. Die Einkristall-Röntgenstrukturen von 1 und 7 werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905860102
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