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  • Articles: DFG German National Licenses  (14)
  • Electronic Resource  (14)
  • Polymer and Materials Science  (11)
  • reperfusion  (3)
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  • Articles: DFG German National Licenses  (14)
Material
  • Electronic Resource  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 91 (1996), S. 50-52 
    ISSN: 1435-1803
    Keywords: Myocardial ischemia ; reperfusion ; myocarial infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: In conclusion 1)Despite certain similarities between ischemic preconditioning and myocardial hibernation, these two cardioprotective phenomena are different in nature. 2) Intermittent reperfusion inbetween the preconditioning and the sustained ischemic period is not necessary for infarct size reduction by ischemic preconditioning.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1803
    Keywords: Greggphenomenon ; regionalfunction ; stunnedmyocardium ; myocardialoxygenconsumption ; reperfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The “Gregg phenomenon” implies that myocardial function and oxygen consumption ( $$M\dot VO_2 $$ ) increase when coronary perfusion is enhanced within or above the autoregulatory range. We have recently demonstrated that the “Gregg phenomenon” has no significance for regional myocardial function and $$M\dot VO_2 $$ in anesthetized swine in situ. There is, however, some evidence that the “Gregg phenomenon” may exist within stunned myocardium. To test whether coronary hyperperfusion increases regional myocardial function and $$M\dot VO_2 $$ in stunned myocardium, in six anesthetized swine the left anterior descending coronary artery (LAD) was cannulated and perfused at constant pressure (CAP) using an extracorporal circuit. The coronary vein which parallels the LAD was cannulated to allow measurement of regional $$M\dot VO_2 $$ and regional systolic wall thickening (WT%) of the anterior myocardium was assessed using sonomicrometry. Blood flow (CBF) to the LAD was increased by increasing CAP within the extracorporal circuit or by intracoronary adenosine infusion (150 μg/min). In normal myocardium, increasing CBF from 71.4 ± 19.7 (SD) to 156.7 ± 48.8 ml/min/100 g by increasing CAP from 100 ± 10 to 190 ± 10 mm Hg or increasing CBF from 75.1 ± 29.1 to 189.2 ± 45.8 ml/min/100 g by intracoronary adenosine infusion did not increase WT% (34.3 ± 12.2 % vs 32.1 ± 10.6 % and 32.3 ± 10.7 % vs 30.1 ± 13.2 %, respectively). $$M\dot VO_2 $$ was not changed during enhanced CAP (6.94 ± 1.05 vs 8.10 ± 1.08 ml/min/100 g) and during intracoronary adenosine infusion (6.67 ± 1.45 vs 7.30 ± 2.23 ml/min/100 g). Twenty min of hypoperfusion followed by 30 min of reperfusion depressed WT% by 47 % (p 〈 0.05). However, $$M\dot VO_2 $$ was only decreased by 23 % (NS). In the stunned myocardium, increasing CBF from 62.1 ± 36.4 to 157.1 ± 60.0 ml/min by increasing CAP was not associated with an increase in WT%. $$M\dot VO_2 $$ , however, increased from 5.14 ± 1.07 to 8.88 ± 1.83 ml/min/100 g (p 〈 0.05). Comparable results were achieved when CBF was increased from 60.3 ± 28.7 to 176.9 ± 48.5 ml/min by intracoronary adenosine infusion. WT% was unaffected, while $$M\dot VO_2 $$ increased from 4.69 ± 0.92 to 9.46 ± 3.39 ml/min/100 g (p 〈 0.05). Thus, increasing coronary perfusion within or above the autoregulatory range increases $$M\dot VO_2 $$ in stunned myocardium, but without a simultaneous increase in regional myocardial function.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 90 (1995), S. 294-296 
    ISSN: 1435-1803
    Keywords: Myocardial ischemia ; reperfusion ; inotropic reserve calcium antagonists ; ACE inhibitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 3191-3195 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Optimized syntheses of 1,3,6,9-tetraoxacycloundecane (2), 1,3,6,9,12-pentaoxacylotetradecane (3), and 1,3,6,9,12,14,17,20-octaoxacyclodocosane (4) as well as some physical and chemical properties and the proof of structure are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 1639-1641 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: No. Abstract.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 571-574 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Measurements effect of elastic waves in steel- and rock rods using the magneto-elasticStress waves in steel and iron ore rods produced by a mechanical impact can be measured by a sensor using the magneto-elastic effect. A detection of the changing magnetic flux is made. The function describing the propagation of longitudinal waves in rods is known as the stress wave equation. The agreement with theory is verified by examinations of steel rods using strain gauges. Afterwards the signals of three iron ores (magnetite, hematite, siderite) are recorded. Induced voltage is measured by the magneto-elastic sensor in the case of magnetite and hematite, however it is not possible to detect any signal for siderite. This means that the change of magnetic flux depends on the kind of bulk magnetic appearance, not on content of iron.Using the magneto-elastic sensor the magneto-elastic effect offers the possibility to detect tree of contact mechanical waves produced by a mechanical impact in ferro- or ferrimagnetic solids.
    Notes: An Stahl- und Eisenerzstäben werden die durch einen Stoß ausgelösten elastischen Dehnwellen mit Hilfe eines Sensors gemessen, der den magnetoelastischen Effekt ausnutzt. Detektiert wird dabei die Änderung des magnetischern Flusses. Die theoretische Beschreibung der Ausbreitung elastischer Längswellen in Stäben erfolgt mit Hilfe der eindimensionalen Dehnwellengleichung. Die Übereinstimmung mit der Theorie wird exemplarisch durch Untersuchungen an Stahlstäben mittels Dehnungsmeßstreifen verifiziert. Danach werden die Signale von drei Eisenerzstäben (Magnetit, Hämatit, Siderit) aufgenommen. Bei den Gesteinen Magnetit und Hämatit lassen sich mit dem magnetoelastischen Aufnehmer Induktionsspannungen messen, während beim Siderit keine Signale aufgezeichnet werden konnten. Das bedeutet, daß für die Änderung des magnetischen Flusses nicht der Eisengehalt, sondern die Art der äußeren magnetischen Erscheinungsform der Proben entscheidend ist.Der magnetoelastische Effekt bietet somit die Möglichkeit die durch eine Stoßbelastung in ferro- bzw. ferrimagnetischen Materialien ausgelösten mechanischen Wellen berührungslos mit Hilfe eines magnetoelastischen Sensors zu erfassen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dependence on chain length of two characteristic properties of amylose, i.e., retrogradation and complex formation with iodine, have been studied by using enzymatically synthesized, homodisperse amyloses. The association rates of amyloses in water containing 5% dimethyl sulfoxide have a sharp maximum at a degree of polymerization P̄n of 80; shorter and longer molecules are much more soluble. The iodine complexes of amylose exhibit a strong Cotton effect in the range of the long-wave absorption maximum (position depending on chain length) and two weaker Cotton effects at 480 and 350 nm. The long-wave Cotton effect is most intense at about P̄n 50 and decreases rapidly for shorter and longer chains. This behavior is unexpected and is not in accordance with the further increase of λmax and λmax. The experiments can best be interpreted by assuming well ordered, stiff chains in the low molecular weight range (P̄n 50-80). For longer chains, the findings are discussed in the light of current concepts of amylose conformation in aqueous solution, namely the model of the broken helical chain (alternating stiff helical segments and unordered regions) and the model of a flexible coil without a significant helical content. However, according to the results given in this paper, a wormlike helical chain seems to be the most adequate model for amylose conformation in neutral solution.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 48 (1960), S. 91-99 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Reactions on the reactive groups of macromolecular substances (e.g., cellulose) have long been known, even since before the structures of macromolecules were understood. H. Staudinger carried out numerous reactions with macromolecules, maintaining the degree of polymerization constant, in order to substantiate the macromolecular structure of the substances investigated (polymeric-analogous reactions). During the last fifteen years reactions with macromolecules have been investigated because it was desirable to compare the chemical diversity of low molecular weight compounds with the corresponding chemical diversity of macromolecular compounds. These endeavors bring forth materials which supplement the numerous macromolecular substances which are produced and used as materials for plastics, and therefore these materials should have as low reactivity and high stability as possible. Objectives are given for the preparation of macromolecules with a large variety of groups. From these objectives it is evident that, as in low molecular weight chemistry, macromolecular substances which possess functional groups of high reactivity are suitable as starting materials. Some of these which have been known for a long time but have been investigated only in recent years are polyaldehydes (polyacroleins and polymethylacroleins), polyacyl halides such as polyacryl chlorides and polyvinylsulfonyl chlorides and fluorides, and, most recently, polymeric organometallic compounds such as poly-p-lithiumstyrene. The reactions with these macromolecules are described and the properties of the resulting new polymeric substances are given.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: From a series of enzymatically synthesized amyloses with a very narrow molecular weight distribution (Pw/Pn = 1.001-1.002) and degrees of polymerization (Pn) between 25 and 480 the iodine complexes were prepared. The absorption spectra as well as the ORD- and CD-curves of these complexes were recorded. COTTON effects were observed at 365, 485 and in the range of 500-600 mμ. The wavelength of the absorption maximum (λmax) of greatest wavelength and of the positive CD-maximum in the region of 500-600 mμ may be described as functions of Pn by the equation : \documentclass{article}\pagestyle{empty}\begin{document}$$\frac{1}{{\lambda _{\max } }} = \frac{1}{{\rm A}} + \frac{{\rm B}}{{\rm A}} \cdot \frac{1}{{{\rm P}_{\rm n} }} $$\end{document} Furthermore, the extinctions, the base molar rotations and dichroic absorptions have been evaluated as a function of Pn. The base molar rotations and the CD-absorptions exhibited a maximum between Pn 70 to 100 and decreased again at higher Pn. ORD and CD increased on standing of the solutions, whereas the locations of the absorption maxima as well as of the COTTON affects remained unchanged. Possible reasons for this behaviour are discussed.
    Notes: Von einer Reihe enzymatisch synthetisierter Amylosen mit sehr enger Molekulargewichtsverteilung (Pw/Pn = 1,00 bis 1,002) und Polymerisationsgraden (Pn) zwischen 25 und 480 wurden die Jodkomplexe hergestellt. Die Absorptionsspektren sowie die ORD-und CD-Kurven dieser Jodkomplexe wurden aufgenommen. Es treten COTTON-Effeket auf bei 365, 485 und im Bereich von 500-600 mμ. Die Wellenlänge des langwelligen Absorptionsmaximums (λmax) sowie des positiven CD-Maximums als Funktion von Pn lassen sich durch folgende Gleichung beschreiben: \documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{1}{{\lambda _{\max } }} = \frac{1}{{\rm A}} + \frac{{\rm B}}{{\rm A}} \cdot \frac{1}{{{\rm P}_{\rm n} }} $$\end{document} Ferner wurden die Extinktionen, die grundmolaren Drehwerte und die CD-Absorptionen als Funktion von Pn untersucht. Drehwerte und CD-Absorption durchlaufen zwischen Pn 70 und 100 maximale Werte und sinken bei höherem pn wieder ab. Sowohl ORD als auch CD nehmen im Laufe der Zeit zu, obwohl die Extinktionen und die Lage der Absorptionsmaxima und der COTTON-Effekte unverändert bleiben. Mögliche Ursachen werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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