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  • Chemistry  (91)
  • 25.90
  • 42.60Da
  • Borrelia burgdorferi
  • Children
  • Diabetes mellitus
  • 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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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastruktur der diabetischen autonomen Neuropathie des Gastrointestinaltraktes (1984)
    Springer
    Journal of molecular medicine 62 (1984), S. 399-405 
    Details
    ISSN: 1432-1440
    Keywords: Electronmicroscopy ; Diabetes mellitus ; Autonomic polyneuropathy ; Gut
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Gastrointestinal motility disorders induced by diabetes mellitus are most commonly manifested in the colon, and are considered to be an expression of diabetic autonomic polyneuropathy. In this study, for the first time, the intrinsic nervous system of the bowel has been subjected to an ultrastructural and morphometric examination in rectal biopsy material obtained from diabetics with and without diabetic enteropathy. In patients with diabetic enteropathy, the nerves of the submucous plexus (Meissner's plexus) revealed significant swelling of the axons, as an expression of neural degeneration. Furthermore, in about a half of these patients, thickening of the basal membrane of Schwann's cells was also detected. Additional, although unspecific, changes found in the diabetics were a quantitative increase in the lysosomes, lipofuscin and glycogen in the Schwann cells. The ultrastructural findings represent evidence for the presence of an intrinsic autonomic polyneuropathy in diabetics with diabetic enteropathy. At the same time, they indicate that the diagnosis of diabetic enteropathy is no longer merely an “exclusion” diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01742296
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  • 3
    Electronic Resource
    Electronic Resource
    Retrospective approach to explain growth retardation and urolithiasis in a child with long-term nutritional acid loading (1992)
    Springer
    European journal of nutrition 31 (1992), S. 121-129 
    Details
    ISSN: 1436-6215
    Keywords: Children ; phenylketonuria ; lowphenylalanine preparations ; acidicdiet ; maximumrenal netacid excretion ; urolithiasis ; Kleinkind ; Phenylketonurie ; phenylalaninarme Diätprodukte ; alimentäre Säurelast ; maximale renale Säureausscheidung ; Harnsteine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Ein Säugling mit Phenylketonurie erhielt unbeabsichtigt für insgesamt 29 Monate eine phenylalaninarme Diät mit hoher alimentärer Säurelast. Eine vorübergehende Wachstumsretardierung und die Entwicklung von Harnsteinen dürften direkte Folgen, eine Karies im Alter von 6 Jahren möglicherweise eine langfristige Konsequenz der chronischen Säurebelastung gewesen sein. Das Beispiel dieser Krankengeschichte zeigt, daß eine chronische alimentäre Säurebelastung ernsthafte klinische Folgen haben kann.
    Notes: Summary An infant with phenylketonuria unintentionally received a highly acidic low phenylalanine diet for 29 months. Temporary growth retardation and urolithiasis were observed, probably as direct effects of chronic acid loading. Caries at the age of 6 years may be a late consequence. This case report shows that chronic dietary acid load may cause serious side effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623070
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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Preparation and properties of composites of kevlar-nomex copolymer and boehmite (1997)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 248 (1997), S. 139-151 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein neuartiges organisch-anorganisches Hybridmaterial wurde durch den Einbau des Minerals Böhmit mittels eines Sol-Gel-Prozesses in ein Kevlar-Nomex-Copolymeres hergestellt. Durch Reaktion eines Gemisches aus m- und p-Phenylendiamin mit Terephthaloylchlorid und anschließender Umsetzung mit Aminophenyltrimethoxysilan wurden Poly(phenylenterephthalamid)-Ketten mit Aminophenyltri-methoxysilan-Endgruppen synthetisiert. In dieser Polymermatrix wurde die Hydrolyse der Alkoxygruppen einer Lösung von Aluminium-sec-butanolat in Butanol durchgeführt. Dadurch wurde ein chemisch an die Aramid-Ketten gebundenes anorganisches Netzwerk aufgebaut. Aus den hergestellten Hybridmaterialien mit unterschiedlichen Böhmit-Gehalten in der Aramidmatrix wurden Filme gegossen. Die Filme aus Hybridmaterial mit bis zu 15 Gew.-% Böhmit waren transparent gelb, während bei 20 und mehr Gew.-% Böhmit opake Filme erhalten wurden. Die mechanischen Eigenschaften dieser Filme wurden untersucht. Zugfestigkeit, Zugmodul, Härte und maximale Bruchdehnung nahmen mit steigendem Böhmitgehalt zunächst zu, vemngerten sich jedoch bei weiterer Erhöhung des Mineralanteils wieder. Der Zugmodul des Hybridmaterials bei 25°C lag zwischen 3,0 und 4,5 GPa. Die Materialien hielten einer maximalen Zugspannung von 252 MPa stand und zeigten Zersetzungstemperaturen von etwa 450°C. Die rnit DMTA ermittelten Werte für den Speichemodul lagen im Bereich 7,6-18,9 GPa. Das tan δ-Signal verbreiterte sich mit zunehmendem Böhmitanteil und ging bei hohen Böhmitgehalten in eine Schulter über. Die Signalpositionen des Verlustfaktors wurden infolge der zunehmenden sterischen Einschränkung der Segmentbewegungen rnit steigendem anorganischen Anteil zu höheren Temperaturen verschoben.
    Notes: A new organic-inorganic hybrid material was prepared by incorporating boehmite into a Kevlar-Nomex copolymer via a sol-gel process. Poly(phenylene-terephthalamide) chains having aminophenyltrimethoxysilane end groups were prepared by reacting a mixture of m-and p-phenylenediamine with terephthaloyl chloride, followed by end-capping with aminophenyltrimethoxysilane. The hydrolysis of the alkoxy groups of an aluminium sec-butoxide solution in butanol was carried out in the polymer matrix, thus creating an inorganic network structure combined chemically with the aramid chains. Hybrid materials containing different proportions of boehmite in aramid were thus produced and films were cast by solvent evaporation technique. These films with up to 15 wt.-% of boehmite were yellow and transparent, whereas the films with 20 wt.-% or more contents of boehmite were opaque. Mechanical properties of these films were analyzed. The values of tensile strength, initial modulus, toughness and maximum strain at rupture were initially found to increase and then decrease with further addition of boehmite. The tensile modulus of the hybrid material was found to be in the range of 3.0-4.5 GPa at 25°C. These ceramers were found to withstand maximum tensile stress of the order of 252 MPa, and the thermal decomposition temperature was around 450°C. The storage modulus as measured using DMTA was in the range of 7.6-18.9 GPa. The tan δ peak which in general became broader with increasing boehmite content showed a shoulder for composites containing large amounts of boehmite. The position of the peaks shifted towards high temperature with the increase in the inorganic contents showing hindrance in motion with increasing boehmite contents.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1997.052480109
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  • 8
    Electronic Resource
    Electronic Resource
    Desaktivierungsverhalten von Arenen und Heteroarenen. XXXVI. Zum Lösungsmittel- und Temperatureinfluß auf das Desaktivierungsverhalten von 9, 9′-Bis(acridizinium-yl) bei hohen Konzentrationen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 225-231 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Deactivation Behaviour of Arenes and Heteroarenes. XXXVI. The Solvent and Temperature Dependence of Deactivation Behaviour of 9, 9′-Bis(acridizinium-yl) at High ConcentrationAt room temperature the geometrical structure of the fluoresceing singlet state of 9, 9′-bis(acridizinium-yl) is determined by the solvent. In solvents of the type A (water, methanol, acetonitril) a plain S1-state emits, in the case of the solvent type B (ethanol, propanol-(2)) the S1-state is twisted. Both excited states have different emission spectroscopical properties.At high concentration (c ≥ 10-4 mol l-1) in the case of the solvent type B a new emission band is observed, and the monomer emission is quenched. This new band is interpreted as a fluorescence from a molecular associate in the excited state. The intensity of this associate band is increasing with decreasing temperature. It is shown that this band is the result of molecular association in the ground state. From the photochemical irradiation it follows that only in the case of the solvent type B a photocycloaddition is possible. The plain S1-state does not react.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250207
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  • 9
    Electronic Resource
    Electronic Resource
    Laser photometric probe for concentration measurements in liquid dispersions (1989)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 35 (1989), S. 507-510 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690350319
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  • 10
    Electronic Resource
    Electronic Resource
    Neue Sol-Gel-Beschichtungen als Korrosions-und Verschleißschutz für NE-Metalle (1998)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 23-29 
    Details
    ISSN: 0933-5137
    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: New Sol-Gel Based Coatings as Corrosion- and Wear-Protection On Non-Ferrous MetalsA new composite coating material has been developed for the protection of non-ferrous alloys (e.g. aluminum, magnesium, zinc and brass). The coating materials were prepared by the solgel process from epoxyalkoxysilanes and aromatic diols to act as crosslinking agents. As solvent, alcohols and glycol ethers have been used.The viscosity of the system (7-55 mPas) was established in a way to be used in spray, dip or flow coating processes. The transparent coatings were cured at T = 100-220°C. In corrosion tests, 3000 hours salt-spray climate and 240 hours CASS-test = Copper chloride and Acetic acid added Salt Spray, no infiltration of the metal-coating interface and no „filiform-corrosion“ on A199.5, AlMg3 and AlMgSil was observed. Brass samples showed less than 4 mm extension of a scribe after 500 hours salt-spray-test. The coatings showed no visible traces of abrasion after 1000 cycles taber abrader test and an excellent adhesion (cross cut and tape-test: grade 0). The transparent basic systems were pigmented by 5 - 10 wt.% of colored organic pigments to obtain all kind of colored coatings.
    Notes: Es wurde ein neuer Beschichtungswerkstoff auf Basis von anorganisch-organischen Kompositen zum Schutz von Metalloberflächen, besonders von Aluminium entwickelt. Das Beschichtungsmaterial wurde über den Sol-Gel-Prozeß synthetisiert, ausgehend von Epoxy-funktionalisierten Alkoxysilanen und aromatischen Diolen als Quervernetzer. Als Lösungsmittel wurden Alkohole und Glykolether verwendet.Die Viskosität der Systeme wurde so eingestellt, daß sowohl Sprüh-, als auch Tauch- und Flut-Beschichtungen durchgeführt werden konnten. Sie lag zwischen 7 und 55 mPas. Nach dem thermischen Verdichtungsprozeß bei 100-220°C wurden transparente Beschichtungen mit ausgezeichneter Haftung auf Al-Mg-, Zn-und Messing-Oberflächen (Gitterschnitt- und Tape-Test: Klasse 0) erhalten. Die Korrosionsfestigkeit beschichteter Aluminiumlegierungen (Al 99.5, AlMg3, AlMgSi I) wurde mit dem Salzsprühverfahren (DIN 50021) und dem CASS-Test (NaCl, CuCl2·2H2O, Essigsäure, pH=3) geprüft und auch nach 3000 Stunden trat keine Unterwanderung der Grenzfläche Metall / Schicht auf. Ebenso wurde keine „Filiform“-Korrosion beobachtet. Messingproben zeigten nach 500 h Salzsprühnebel-Test weniger als 4 mm mittlere Unterwanderungsbreite. Darüber hinaus wurde die Abriebbeständigkeit der Proben überprüft. Die Schichten zeigten keine sichtbare Beschädigung nach Prüfung des Abriebes mit dem Reibradverfahren (1000 Zyklen, Räder: CS 10-F).Es konnten stabile Dispersionen von organischen Farbpigmenten im transparenten Basissystem hergestellt werden, wodurch eine große Vielfalt farbiger Beschichtungen erhalten wurde.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19980290108
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