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  • 1980-1984  (3)
  • 1965-1969  (3)
  • Polymer and Materials Science  (4)
  • Antibiotic prophylaxis  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Short course netilmicin prophylaxis in renal stone surgery (1983)
    Springer
    Urological research 11 (1983), S. 207-210 
    Details
    ISSN: 1434-0879
    Keywords: Netilmicin ; Antibiotic prophylaxis ; Aminoglycosides ; Renal stone surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following surgery for the removal of intrarenal calculi 30% of patients will develop severe wound complications. This study assesses the role of a short course of netilmicin given over the operative period, in 20 consecutive patients. Preoperative studies demonstrated that whilst 20% of patients had bacterial growth in the urine, culture of the removed calculus demonstrated that 50% of the stones exhibited a significant bacterial growth. Of the 20 patients, only one developed a wound complication. Following the preoperative dose, satisfactory netilmicin levels were obtained and no patient had levels 〉1 μg ml-1 by 7 h. Despite some degree of renal impairment, serum urea and creatinine values were unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272280
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Prophylactic cefuroxime in transurethral resection (1984)
    Springer
    Urological research 12 (1984), S. 279-281 
    Details
    ISSN: 1434-0879
    Keywords: Antibiotic prophylaxis ; Transurethral resection of prostate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 65 men undergoing elective transurethral resection of the prostate under the care of one urologist entered a randomised controlled trial using Cefuroxime. Patients were excluded if they had received antibiotics in a 2 week period before surgery, if they had positive pre-operative urine cultures or if they had been catheterised. 58 patients completed the study. One patient in the antibiotic group and 2 in the control group developed urinary infection. The overall infection rate was 5.17%. The control and antibiotic groups were comparable as regards age and the duraction of resection. One patient in the antibiotic group developed an allergic reaction. It is felt that routine antibiotic prophylaxis in patients with sterile urine undergoing elective TUR is unnecessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258035
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependence of secondary crystallization in linear polyethylene (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 659-666 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A specimen of linear polyethylene was subjected to isothermal secondary crystallization at a series of temperatures below the primary isothermal crystallization temperature, the melting and primary crystallization stages being held constant throughout the investigation. Dilatometric measurements exhibit an S-character at low values of undercooling Tp - Ts, where Tp and Ts are, respectively, the primary and secondary crystallization temperatures; at larger undercoolings, however, an initial very rapid crystallization is followed by a very slow stage. When corrected for thermal contraction of the polymer, the net degree of secondary transformation is seen to peak at a temperature in the range 109-113°C. The S-character of the isotherms and the peaked temperature variation of degree of transformation lead to the conclusion that a large portion of the secondary crystallization consists of the nucleation and growth of the new crystallites. Johnson-Mehl-Avrami analysis leads to a model of heterogeneous nucleation within the remaining amorphous zones, followed by one-dimensional, diffusion-controlled growth.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070405
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of thermal history on fusion curves of polyethylene (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 2325-2330 
    Details
    ISSN: 0021-8995
    Keywords: 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 , Physics
    Notes: The effect of thermal history on the melting behavior of several linear polymer and copolymers of ethylene has been studied by using a Perkin-Elmer DSC-1 differential scanning calorimeter. Samples of film were heated above their melting point and then cooled at various rates in order to establish a known thermal history. During melting, homopolymers showed one peak and the copolymers two peaks in the DSC scan. The positions and relative sizes of the peaks were dependent on the prior cooling rate. It is suggested that two crystal types occur in the case of copolymers because of entanglements in the branched segments of the molecules. The position of the lower melting endotherm in blown films suggests that cooling rates of about 500°C./min. are achieved in this process.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070111119
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of proccessing on flow properties of some linear polyethylene resins (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 547-555 
    Details
    ISSN: 0021-8995
    Keywords: 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 , Physics
    Notes: Changes in flow properties of polyethylene resins have often been observed during processing operations. Studies in this laboratory show that melt viscosity of polyethylene normally increases when the resin is heated in a compression mold at temperatures below 300°C. At the same time, the solution viscosity actually decreases in some cases. During extrusion, on the other hand, both melt viscosity and solution viscosity are shown to decrease. In addition, the logarithm of melt flow rate is seen to deviate markedly from the expected linear dependence on reciprocal of absolute temperature. The results suggest that both crosslinking and chain-scission reactions occur during processing, the former predominating at low or zero shear, the latter at high shear.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070120313
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Copolymerization of liquid sulfur with certain olefinic systems and structure-property studies on the polymeric materialsAbstracted in part from a dissertation submitted to the Departments of Chemistry and Chemical Engineering, Polytechnic Institute of New York, in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Polymer Science and Engineering, 1979. (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 383-406 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid sulfur-olefinic reactions at 140°C forming crosslinked polysulfide polymers have been investigated. A systematic approach to the characterization and some structure-property studies on these new polymeric materials has been presented. The olefinic systems of interest are endo-and exo-dicyclopentadiene and an oligomeric alkenyl polysulfide. Equimolar S8-olefinic system copolymers are amorphous and they show no tendency for sulfur crystallization. A correlation has been drawn between chemical structure and glass transition temperature of the copolymers and terpolymers. Mechanical properties and, in particular, chemical stress relaxation of the crosslinked polysulfide polymers have been investigated.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180201
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