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  • poly(ethylene terephthalate)  (2)
  • Acute renal failure  (1)
  • Analytical Chemistry and Spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Acute renal failure: the glomerular and tubular connection (1987)
    Springer
    Pediatric nephrology 1 (1987), S. 348-358 
    Details
    ISSN: 1432-198X
    Keywords: Acute renal failure ; Glomerular ultrafiltration ; Tubular injury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acute renal failure (ARF) is a common clinical entity which results from multiple causes. Experimental models in animals have duplicated many of the clinical syndromes which can be classified into (1) ARF due to increased filtered load of endogenous and exogenous materials, (2) ARF associated with exogenous nephrotoxins and (3) ischemic forms of renal failure secondary to hypoperfusion and hypotension. The mechanisms leading to the reduction in GFR are multiple and the alterations in determinants of nephron filtration rate and degree of tubular backleak and obstruction are described for each of these subtypes of experimental ARF. The specific mechanisms whereby tubular damage translates into a reduction in GFR in ARF are discussed for each sub-type of ARF. Tubular damage can often be dissociated from the reduction in GFR, possibly by inhibiting tubuloglomerular feedback responses, but such increases in GFR and nephron filtration rate are not necessarily beneficial to the organism because of potential volume depletion and the risk of magnifying further tubular damage. Information on the physiologic role of tubuloglomerular feedback activity in ARF is provided and supports the concept that feedback induced reductions in GFR after tubular injury may preserve extracellular volume and minimize further tubular damage. Reductions in tubular metabolic work appears to prevent and ameliorate further tubular injury after the initial insult. The mechanisms which associate changes in GFR and tubular damage can now be described, and therapies which improve GFR without correcting the tubular damage may compound the clinical problem and increase renal damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00849234
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transverse heterogeneity in PET fibers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1331-1337 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terephthalate) ; transverse heterogeneity ; crystallinity ; high speed spinning ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray scattering from a series of poly(ethylene terephthalate) (PET) fibers spun at differet speeds is analyzed to probe the morphology in the direction transverse to the fiber axis. Both the apparent crystal modulus, determined from the change in wide-angle X-ray scattering angle with fiber stretching, and the transverse degree of crystallinity indicate there is a substantial interfiberillar amorphous content. In the PET fiber spun at conventional speeds, only roughly one-quarter of the fiber cross-section is actually occupied by fibrils. The transverse crystallinity increases for fibers spun at speeds sufficient to cause crystallization in the spin line. The X-ray moduli and fibril diameters are correspondingly larger in these high speed spun fibers. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311008
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The amorphous phase in high-speed spun PET fibers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1339-1345 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene terephthalate) ; series-parallel model ; series-aggregate model ; high-speed spinning ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two phenomenogical descriptions of oriented semicrystalline polymers, the series-parallel model and the series-aggregate model, were applied to poly(ethylene terephthalate) (PET) fibers obtained at different spinning speeds. The mechanical behavior of the fibers conformed well to both models. The analyses indicate that PET fibers obtained by high-speed spinning possess a more compliant interfibrillar amorphous phase. This feature may account for both the greater dimensional stability, as well as the more reversible mechanical behavior, exhibited by high-speed spun PET. © 1993 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311009
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Importance of quality control in a gas chromatographic method to characterize crude oilsMany of the details in this paper were presented as a poster at the Tenth International Symposium on Capillary Chromatography, Riva del Garda, Italy, May 22-25, 1989. (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 463-468 
    Details
    ISSN: 0935-6304
    Keywords: Capillary GC ; Petroleum crude oil ; Condensates ; Carbon number distribution ; Pseudocomponents ; Quality control ; Quality assurance ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A quality control scheme has been developed to achieve reproducible capillary GC characterization of crude oils and petroleum condensates. The method uses an internal standard to quantify the amount of non-eluted material in the crude oil sample. Correlation between the gas chromatographic results and actual distillation was 2 %. After repeated use, however, weekly analysis of the same standard crude oil did not give the correct composition. This was a result of discrimination, which worsened with time, as a result of leaks in the septum or the graphite ferrules. More reproducible results were obtained by performing frequent analyses of quality control samples to ensure that the gas chromatographic system was operating properly. The use of quality control charts was a convenient way of ensuring correct operation and identifying the need for corrective action on the gas chromatographic system.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240170613
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    Paper (German National Licenses)
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