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  • 1
    Electronic Resource
    Electronic Resource
    Degradable, microporous vascular prosthesis from segmented polyurethane (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 854-858 
    Details
    ISSN: 1435-1536
    Keywords: Polyurethane ; medical application ; vascular prosthesis ; degradation ; tissue regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small caliber (1.5 mm I. D.) vascular prostheses have been prepared from fractionated segmented polyurethane. The microporous and compliant prosthesis when implanted in the abdominal aorta of the rat, induced the growth of a neo-conduit, with a cellular structure similar to that of the natural artery. The process of growth of the neo-artery was accompanied by a progressive degradation of the prosthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410635
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical characterization of the black crust present on the stone central portal of St. Denis abbey (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 1211-1214 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  A black crust sample from the stony central portal of the abbey of St. Denis, France, was analyzed by chromatographic and spectroscopic techniques to determine whether it was due to atmospheric pollution or to the degradation of a past restoration treatment. Stratigraphic surveys by optical microscopy, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy/energy dispersive X-ray fluorescence (SEM/EDX) and pyrolysis/gas chromatography/mass spectrometry (PY/GC/MS) were consistent in ascribing the bulk of the crust to gypsum (CaSO4 ⋅ 2H2O) with inclusion of carbon particulate. The organic fraction was a minor constituent of the black crust. Hence, the deterioration by an organic substance used in the past to restore the building was ruled out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050333
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison between CP/MAS 13C-NMR and pyrolysis-GC/MS in the structural characterization of humins and humic acids of soil and sediments (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 299-306 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The chemical structure of humins (HUs) and humic acids (HAs) of terrestrial and marine environments was investigated by cross-polarization magic angle spinning 13C-nuclear magnetic resonance spectroscopy (CP/ MAS 13C-NMR) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Samples of HUs and HAs were obtained from sediments of the Adriatic Sea, the Lagoon of Ravenna (Adriatic Sea) and the Bubano Lake as well as from an agricultural soil. HUs displayed pyrograms and NMR spectra different from those of related HAs. According to NMR spectra HUs were more aliphatic and contained fewer carboxyl groups than HAs, while pyrolysates of HUs were characterized by higher levels of products arising from carbohydrates and lower levels of lignin methoxyphenols with respect to HAs. The relative content of paraffinic carbons determined by NMR was in good agreement with the relative abundance of unbranched aliphatic hydrocarbons released by pyrolysis. Both techniques evidenced the importance of polymethylene structures in HUs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051078
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  • 4
    Electronic Resource
    Electronic Resource
    Combined laparoendoscopic colon resection and anastomosis using the ``no touch technique'' and fibrin glue (1998)
    Springer
    Surgical endoscopy and other interventional techniques 12 (1998), S. 1046-1050 
    Details
    ISSN: 1432-2218
    Keywords: Key words: Laparoscopy — Colon anastomosis — Colon resection — Endoscopy — Fibrin glue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Laparoscopic colon anastomosis are technically demanding. A new technique for colon resection and anastomosis using a combined laparoendoscopic approach is presented. Methods: In 10 pigs, pneumoperitoneum was induced and 5 trocars were placed. A sigmoid segment was isolated; a vein stripper was inserted from the anus, and the head was secured with a tie; the segment was intussuscepted pulling the stripper out; 4 seromuscular sutures were placed at the anastomotic site and fibrin glue was spread all around; an electrical wire loop, introduced via a colonoscope, was used to resect the intussuscepted segment that was removed from the anus. Results: All animals but one survived until sacrifice at 30, 60, 90, and 120 days. Macroscopically, the anastomosis appeared well healed; microscopically, after 90 days, there was a complete restitutio ad integrum of the intestinal wall. Conclusions: This technique is feasible and quick; it could be used clinically in small tumors not removable endoscopically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004649900778
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  • 5
    Electronic Resource
    Electronic Resource
    Polyurethane vascular prostheses in pigs (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 774-778 
    Details
    ISSN: 1435-1536
    Keywords: Polyurethanes ; medical application ; hydrolytic stability ; vascular prostheses ; tissue regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Microporous, compliant vascular prostheses made from segmented polyurethanes of various molecular stability, have been implanted in the infrarenal aorta of young pigs. Prostheses prepared from a hydrolytically suble polyetherurethane showed a limited patency up to 1 month. Composite prostheses with the wall made from a hydrolytically stable polyurethane and the lumen side prepared from a degradable polyurethane, were patent up to one year. A degradable layer of this composite prosthesis induced the growth of a neo-artery. Prostheses prepared from a degradable polyurethane alone, were substituted within 4 months with a functional neo-artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418452
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  • 6
    Electronic Resource
    Electronic Resource
    HPLC characterization of phenolics in lignocellulosic materials (1988)
    Springer
    Chromatographia 26 (1988), S. 191-196 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Electrochemical detector ; Phenolics ; Lignocellulosic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application of HPLC with an electrochemical detector for the determination of phenolics in lignocellulosic materials is reported. The separation of phenolic acids and aldehydes (gallic acid, p-hydroxybenzoic acid, vanillic acid, p-coumaric acid, syringic acid, ferulic acid, vanillin, syringaldehyde and p-hydroxybenzaldehyde) on two different columns (reversed phase C6 and styrene-divinylbenzene PLRP-S) is shown. Chromatograms of phenolic compounds in neutral, basic and oxidative extracts of wheat straw treated with NaOH and white rot fungusStropharia rugosoannulata are reported along with quantitative results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268150
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  • 7
    Electronic Resource
    Electronic Resource
    HPLC determination of catabolic amines in silage using their dansyl derivatives and an electrochemical detector (1989)
    Springer
    Chromatographia 27 (1989), S. 216-220 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Electrochemical detector ; Amines ; Silages ; Feedstuffs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The use of the electrochemical detector (EC) in the high performance liquid chromatography (HPLC) of dansyl derivatives of biogenic amines is reported. Isocratic and gradient elution patterns of synthetic mixtures of putrescine, cadaverine, 1,6-diaminohexane, tryptamine, histamine, tyramine, spermine and spermidine on a reversed phase column are shown. Hydrodynamic voltammograms of standard compounds are presented. The detection limits of the EC are compared with those of ultraviolet and spectrofluorimetric detectors. A chromatographic profile of amines from the proteolytic catabolism of maize silage byClostridia is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260449
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  • 8
    Electronic Resource
    Electronic Resource
    Use of analytical pyrolysis to characterize Egyptian painting layers (1995)
    Springer
    Chromatographia 40 (1995), S. 594-600 
    Details
    ISSN: 1612-1112
    Keywords: Pyrolysis-gas chromatography-mass spectrometry ; Fourier-transform infrared spectroscopy ; Ancient Egyptian painting media ; Egyptian sarcophagus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An Egyptian wooden sarcophagus and a cartonnage (664–525 B.C.) were subjected to pyrolysis-gas chromatography-mass spectrometry (PY-GC-MS) and Fourier-transform infrared spectroscopy (FT-IR) in order to characterize pigments and organic binding media. The aim of these investigations is to acquire a better knowledge of the painting technique used in ancient Egypt. Results showed that PY-GC-MS offered a rapid tool to discriminate between wax-based- and animal protein-based binders and to recognize the use of mixtures of the two products. FT-IR corroborated the pyrolysis findings, but sometimes provided less unequivocal results than PY-GC-MS. As an additional benefit, PY-GC-MS allowed the identification of a yellow pigment as the arsenic sulphide orpiment by means of the volatile As4 among the pyrolysis fragments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290274
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of lignocellulosics by pyrolysis-gas chromatography-ion trap detection (1990)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 13 (1990), S. 52-55 
    Details
    ISSN: 0935-6304
    Keywords: Pyrolysis ; Gas chromatography ; Mass spectrometry ; Lignocellulose analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wheat straw lignins obtained by HF, H2SO4, HCL, NaOH, and dioxane/water extraction methods and native wheat straw were subjected to pyrolysis-gas chromatography (Py-GC). Pyrolytic fragments were tentatively identified by mass spectrometry using an on-line Py-GC-Lon Trap Detector (Py-GC-ITD) and their origin could be attributed to polysaccharides and lignin. Quantitation of fourteen main peaks common to all pyrograms showed statistically significant differences depending on lignin preparation. Pyrograms of typical lignin preparations, native wheat straw, and pure cellulose and ITD mass spectra are reported.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240130111
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  • 10
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectrometry of polyphenols (syn. vegetable tannins) (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 449-468 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200130902
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