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  • 1990-1994  (4)
  • 1980-1984
  • 1992  (2)
  • 1991  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The influence of different levels of PEEP on peripheral tissue perfusion measured by subcutaneous and transcutaneous oxygen tension (1992)
    Springer
    Intensive care medicine 18 (1992), S. 474-478 
    Details
    ISSN: 1432-1238
    Keywords: Subcutaneous oxygens tension ; Transcutaneous oxygen tension ; Tissue perfusion ; PEEP ; Cardiac output ; Oxygen delivery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective To compare subcutaneous (PscO2) and transcutaneous (PtcO2) oxygen tension measurements in relation to hemodynamic variables at different levels of PEEP, and to evaluate the usefulness of these measurements as monitors of peripheral tissue perfusion. Design Prospective trial. Setting Intensive care unit in a university hospital. Patients Seven patients with gastric cancer who where undergoing total gastrectomy. Interventions Silicone catheter was placed in the upper arm and transcutaneous oxygen monitor was placed on the upper part of the chest. A pulmonary artery catheter was placed in the right pulmonary artery. Measurements and results PscO2 and PtcO2 together with hemodynamic variables were measured at different levels of PEEP. Progressive increase of PEEP reduced cardiac index (CI) (p〈0.05) with a concomitant decrease of PscO2 (p〈0.05) and oxygen delivery (DO2) (p〈0.05). Changes in PtcO2 parallelled changes in arterial oxygen tension (PaO2), but no correlation was found between PtcO2, CI and DO2. Conclusion PscO2 is a sensitive indicator of subcutaneous tissue perfusion, which can be used to identify the PEEP level, with optimum peripheral perfusion. PscO2 seems to be a more reliable indicafor of tissue perfusion than PtcO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01708584
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On integer points in polyhedra (1992)
    Springer
    Combinatorica 12 (1992), S. 27-37 
    Details
    ISSN: 1439-6912
    Keywords: 52 A 25 ; 90 C 10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We give an upper bound on the number of vertices ofP I , the integer hull of a polyhedronP, in terms of the dimensionn of the space, the numberm of inequalities required to describeP, and the size ϕ of these inequalities. For fixedn the bound isO(m n ϕ n− ). We also describe an algorithm which determines the number of integer points in a polyhedron to within a multiplicative factor of 1+ε in time polynomial inm, ϕ and 1/ε when the dimensionn is fixed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01191202
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Bildung wasserlöslicher Cellulosephosphate durch homogene Acylierung im System Cellulose N2O4/DMF. 1. Mitt.: Problemstellung und Ergebnisse zur Acylierung mit POCl3 (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 213-217 
    Details
    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: After dissolution in the N2O4/DMF-system resulting in a partial substitution of OH-groups by nitrite ester groups, cellulose has been phosphorylated at homogeneous conditions of reaction with POCl3 to DSp-values up to about 1 in the presence of triethylamine. Solubility of the products in water was found in the DSp-range between 0.3 and 0.6 after suitable treatment of the reaction product in a protic medium.
    Notes: Nach Auflösung in einem N2O4/DMF-Gemisch unter partieller Bildung des Nitritesters wurde Cellulose unter homogenen Reaktionsbedingungen mit POCl3 in Gegenwart von Triethylamin bis zu DSp-Werten von etwa 1 phosphoryliert. Wasserlösliche Produkte wurden im DSp-Bereich zwischen 0,3 und 0,6 nach einer Behandlung des Reaktionsproduktes in einem protischen Medium erhalten.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420506
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Bildung wasserlöslicher Cellulosephosphate durch homogene Acylierung im System Cellulose/N2O4/DMF. 2. Mitt.: Ergebnisse zur Acylierung mit Derivaten des POCl3 und zusamenfassende Diskussion zum Ablauf der Phosphorylierung im System N2O4/DMF/Cellulose1. Mitt.: siehe [1] (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 554-560 
    Details
    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: Cellulose and carboxymethyl cellulose are phosphorylated after dissolution in the N2O4/DMF-system by employing a modified acylation agent prepared by reaction of POCl3 with H2O and with N2O4, respectively. The N2O4-modified reagent was found to be suitable for preparing water-soluble cellulsoe phosphates in the Na+ and the triethylammonium salt form in a DS-range between 0.2 and 1.3. A reaction mechanism taking into account the steps of acylation and after-treatment is discussed.
    Notes: Cellulose und Carboxymethylcellulose wurden nach Auflösung im N2O4/DMF-System mit modifizierten Phosphorylierungs-reagentien acyliert, die durch Umsetzung von POCl3 mit Wasser oder mit N2O4 erhalten wurden. Das durch Umsetzung mit N2O4 modifizierte Reagens erwies sich als geeignet zur Gewinnung wasserlöslicher Cellulosephosphate in Form des Natrium-oder des Triethylammoniumsalzes im DS-Bereich zwischen 0,2 und 1,3. Ein Reaktionsmechnaismus für die bei Acylierung und Nachbehandlung ablaufenden Umsetzungen wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010421105
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    Paper (German National Licenses)
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