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  • Polymer and Materials Science  (6)
  • Drittgradige Brandverletzung  (1)
  • Flüssigextraktion bzw. Direktmessung für Harn  (1)
  • Necrectomy
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  • 1
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The potentiometric and viscosimetric titration curves of poly(N-acetyldehydroalanine) (PNAcDHA) were compared with those of the nucleic acid base-containing dehydroalanine backbone polymers poly{(+ -) and (-)- [2-(thymin-1-yl]{propanoamido}propenoic acid} (PTDHA and P(-)TDHA)). The behavior of PNAcDHA was similar to polyacids such as poly(acrylic acid), but PTDHA and P(-)TDHA displayed very strong nearest neighbor interactions, since the pH curves had an additional inflection at half neutralization that was sensitive to the ionic strength of the medium and the viscosity curves showed little expansion of the polymer coil with increasing ionization. NAcDHA-TDHA copolymers were prepared which showed similar behavior. These results suggested that PTDHA and P(-)TDHA were extended and conformationally restricted in aqueous solution compared to PNAcDHA, findings that agreed with the results of spectroscopic studies of these polymers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Blut, Harn ; Spektralphotometrie, Atomabsorption ; elektrothermal, Deproteinierung/Matrixmodifikation für Vollblut ; Flüssigextraktion bzw. Direktmessung für Harn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Simple, rapid methods are described for the determination of Cadmium in whole blood and urine by means of electrothermal atomic absorption spectrophotometry. 50–200 μl aliquots of whole blood were treated with 1M HNO3 for deproteinization and matrix modification. After centrifuging the supernatant is taken for automated electrothermal atomicabsorption spectrophotometry (ETAAS). Precision, expressed as day-to-day precision varied from 30% at 0.4 μg Cd/l to 3.8% at 9.3 μg Cd/l whole blood. If 25 μl of an 1+3 diluted blood are injected a detection limit of ≤ 0.2 μg Cd/l is achieved. Direct automated Cd-determinations in urine are feasible after dilution from about 0.2 μg Cd/l. Solvent extraction using NaDDC/MIBK is possible to ≤ 0.1 μg Cd/l. The day-to-day reproducibility varies from 26% at about 0.6 μg to 7.1% at about 27 μg Cd/l urine. The accuracy of these methods was checked by differential-pulse-anodic-stripping voltammetry (DPASV) and independent AAS procedures and found to be quite acceptable with an average total error of ≤ 30%. In routine up to 200 Cd measurements are possible in whole blood and up to 160 direct Cd measurements in urine per day (10 h).
    Notes: Zusammenfassung Einfache, rasche Methoden für die Bestimmung von Cadmium in Vollblut und Harn mit elektrothermaler Atomabsorptionsspektrometrie werden beschrieben. 50–200 μl Aliquots von Vollblut werden mit 1 M HNO3 zur Deproteinierung und Matrixmodifikation behandelt. Nach Zentrifugieren wird die überstehende Lösung zur automatisierten elektrothermalen Atomabsorptionsspektrophotometrie (ETAAS) verwendet. Die Reproduzierbarkeit, ausgedrückt als Tag-zu-Tag-Reproduzierbarkeit variert von 30% bei 0,4 μg Cd/l bis zu 3,8% bei 9,3 μg Cd/l Vollblut. Bei 25 μl-Eingabe eines 1+3 verdünnten Bluts wird eine Nachweisgrenze von ≤ 0,2 μg Cd/l erreicht. Direkte automatisierte Cd-Bestimmungen im Harn sind nach Verdünnung ab 0,2 μg Cd/l durchführbar. Flüssigextraktion mit NaDDC/MIBK erlaubt Cd-Bestimmungen bis ≤ 0,1μg Cd/l. Die Tag-zu-Tag-Reproduzierbarkeit variiert von 26% bei etwa 0,6 μg Cd/l bis 7,1% bei etwa 27 μg Cd/l Harn. Die Richtigkeit dieser Methoden wurde durch Differential — Pulse — Anodic — Stripping — Voltammetrie (DPASV) und unabhängige AAS-Verfahren überprüft und als akzeptabel mit einem mittleren Gesamtfehler von ≤ 30% gefunden. Im Routinebetrieb sind bis zu 200 Cd-Messungen in Blut und bis zu 160 Direkt-Messungen von Cd in Harn pro Arbeitstag (10 h) möglich.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 13-17 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Synthese und Eigenschaften einiger neuer funktioneller Oligomere sowie daraus erhaltener funktioneller und segmentierter Polymere werden beschrieben. Im ersten Teil der Arbeit werden Synthese und Eigenschaften von hochentwickelten segmentierten Konstruktionspolymeren behandelt. Die Polymere enthalten als starre Segmente vernetzte Bereiche; diese sind durch lineare Spacersegmente verbunden, die aus thermoplastischen Oligomeren mit funktionellen Endgruppen gebildet werden. Die Struktur-Eigenschafts-Beziehungen werden diskutiert. Der zweite Teil der Arbeit berichtet über die Synthese und mögliche Anwendungen von neuen funktionellen Oligomeren und Polymeren, die Cyclophosphazen-Einheiten enthalten. Besondere Aufmerksamkeit wird funktionellen Polymeren mit bioaktiven Aziridinylcyclophosphazen-Einheiten gewidmet, die durch spezielle biologisch abbaubare Spacer verbunden sind.
    Notes: Syntheses and properties of some novel functional oligomers and functional or segmental polymers thereof are reported. First part of the paper concerns the synthesis and properties of high performance segmental engineering polymers. These polymers contain crosslinked network units as rigid segments, linked by linear spacers, derived from the functionally terminated thermoplastic oligomers. Structure-properties relationships are discussed. Second part of the paper refers to the syntheses and possible applications of novel functional oligomers and polymers, containing cyclophosphazene moieties, particular attention being paid to the functional polymers with bioactive aziridinylcyclophosphazene units linked by specific biodegradable spacers.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alternating copolymers containing 4,4-isopropylidene-bisphenol (BPA) and comonomers with various degrees of polarity have been evaluated to find comonomer structures which provide low melt viscosity and good thermal stability. The materials were prepared by pyridine-catalyzed nucleophilic displacement reactions similar to that for the preparation of BPA polycarbonate. The molecular weights of the polycarbonates depend on the concentration and nucleophilicity of the attacking diol and the concentration and stability of a colored pyridine-chloroformate adduct formed during polymerization. The greatest thermal stability occurs for BPA-DMS and BPA-DEG. Thermomechanical flow measurements and Tg measurements were used to evaluate melt viscosity. The shapes and magnitudes of the Tg vs. Tf curves are sensitive to the copolymer chemical structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Water-soluble polynucleotide analogs having a poly(N-acyldehydroalanine) {poly(α[-(N-acylamino)acrylate])} backbone were studied by 360-HMz 1H-NMR, UV, and CD spectroscopies. Significant UV hypochromicity values for the polymers versus monomer model compounds as well as peak shifts in the NMR spectra implied a high degree of base stacking in these systems. The CD spectrum of poly{(-)-2-[2-(thymin-l-yl) propanoamido] propenoic acid} (p(-)TDHA), having an optically active side chain, was remarkably insensitive to the degree of neutralization of the polymer, but was very sensitive to the ionic strength of the solution. Continuous variation mixing experiments revealed no base-pairing interactions between complementary charged polymers, and weak interactions between charged and uncharged polymers and model compounds. These results suggest that the polymers are conformationally restricted in solution.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 4,6-Tetrachlorocyclotriphosphazene-2-spiro-2′-dinaphtho [1,2-d:2,1-e] [1,3,2]dioxaphosphepin (1a) and the dinaphtho [2,1-d:1,2-e] derivative (1b) were synthesized and identified on the basis of elemental and spectral (MS, IR, UV, 1H and 31P NMR) analysis. The anticancer activity of the new isomers against P388 leukemia was studied in vivo and discussed in terms of their electronic structures. A strict correlation was found between the resonance effects in the particular isomers and their antitumor activities.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 364 (1984), S. 229-232 
    ISSN: 1435-2451
    Keywords: Third-degree burn injuries ; Necrectomy ; Temporary defect cover ; Skin transplantation ; Drittgradige Brandverletzung ; Nekrektomie ; Temporäre Defektdeckung ; Hauttransplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Drittgradige Brandverletzungen erfordern aus vitaler, funktioneller oder ästhetischer Indikation eine plastisch-chirurgische Therapie. Um das Infektionsrisiko möglichst gering zu halten, sollte mit der Nekrektomie so früh als möglich begonnen werden. Ausdehnung und Tiefe der Gewebsschädigung, der Infektionsgrad der Wunde sowie der Allgemeinzustand des Verletzten entscheiden darüber, ob eine temporäre Defektdeckung notwendig ist oder die autologe Spalthauttransplantation sofort angeschlossen werden kann. Hierzu haben sich neben den Streifentransplantaten Mesh-graft-Transplantate in unterschiedlicher Vergrößerung sehr bewährt.
    Notes: Summary In third-degree bum injuries vital, functional or esthetic indications require surgical therapy. In order to keep the risk of infection as low as possible it is necessary to begin with the necrectomy as soon as possible. Extent and depth of the damaged tissue, the degree of the wound infection as well as the patient's physical condition decide whether the defect should be covered temporarily or whether an autologous splitskin transplantation should be performed. In addition to stripe transplants meshgraft-transplants of different sizes have proved to be very successful in surgery of burn injuries.
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  • 8
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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