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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 184 (1989), S. 62-65 
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The anatomical distribution of intra-myocardial collateral arteries that develop from the septal to the other major coronary arteries was studied in dogs following gradual Ameroid occlusion of tftt circumflex artery. The septal artery was cannulated and injected with Batson's plastic compound resulting in a cast of the coronary circulation. Collateral vessels radiated from the septal vascular bed to both the circumflex and anterior descending arteries. The collaterals developed from the entire base-to-apex extent of the septal artery and were found on both the right and left sides of the septum. Collateral growth appeared to be more concentrated at the apex of the heart. The anatomical details of septal collateral circulation illustrate the importance of intramyocardial collateralization in the dog, which was thought to exhibit primarily epicar-dial collaterals.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 204 (1982), S. 113-122 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: This study was designed to quantitate and describe the incidence and magnitude of myocardial infarction in the canine heart following acute and gradual occlusion of the circumflex or right coronary arteries. In animals with acute occlusion, the circumflex artery was ligated just distal to the bifurcation of the left coronary artery for 4 hr (seven dogs). Gradual occlusion was produced by placing an Ameroid occluder on the circumflex artery for 1 month (nine dogs), 3 months (nine dogs), and 5 months (eight dogs) and on the right coronary artery for 3 months (nine dogs). Ten dogs served as controls. At the end of the experiments the dogs were sacrificed, and identification of myocardial infarction was made with an enzyme-mapping technique in dogs with acute occlusion and with histological methods in dogs with gradual occlusion. The volume of ventricular infarction was determined with the use of an Apple II Computer and graphics tablet. After 3 months, gradual occlusion of the right coronary artery produced a 22% incidence of infarction which was significantly less (P 〈.01, X2) than the 67% incidence observed with 3 months of gradual circumflex occlusion. The average infarct volume produced by gradual right coronary occlusion was 0.94 + 0.69%. The average volume of left ventricular infarction in animals with circumflex acute occlusion was 15.6% + 6.6 and the incidence of infarction was 100%. With gradual occlusion of the circumflex artery for 1, 3, and 5 months, average left ventricular infarction was 2.02 ± 1.01%, 3.13 ± 1.53%, and 2.96 ± 1.35%, respectively. There were no significant differences in the amount of damage observed among the three groups with gradual occlusion, and the average incidence of infarction for these three groups was 76%. In the 1-, 3- or 5- month animals with circumflex occlusion, no additional areas of necrosis subsequent to the original damage were found, indicating that infarction is a single event in this model of gradual occlusion. These results suggest that infarct size is determined primarily by factors at the time of total occlusion and that gradual occlusion allows sufficient time for collateral growth, thereby limiting the extent of myocardial injury.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird ein Verfahren beschrieben, mit dem es auch ungelernten Kräften möglich ist, den Kaliumgehalt von Kalisalzen durch Messung der Intensität der β-Strahlung des 40K innerhalb weniger Minuten mit großer Genauigkeit zu bestimmen. Es kann nicht nur im Laboratorium angewendet werden, sondern ermöglicht auch die Bestimmung unter Tage und ist damit den bisher üblichen Methoden beträchtlich überlegen.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 286 (1956), S. 221-231 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Drei carbonatreiche Rohphosphate: Constantine-, Gafsa- und Curacaophosphat werden chemisch und röntgenographisch analysiert. Die ersten beiden sind Fluorcarbonatapatite und enthalten außer dem in das Apatitgitter eingebauten Anteil Calciumcarbonat (10-11%) noch in diskreten Teilchen eingelagerten Calcit (2-4%). Curacaophosphat besteht im wesentlichen aus einem Gemisch von Hydroxylapatit mit β-Tricalciumphosphat. Der erhebliche Gehalt an Calciumcarbonat (∼15%) ist hier wahrscheinlich nicht eingebaut. Ein einfaches Extraktionsverfahren zur Bestimmung von Calcitcarbonat neben Apatitcarbonat wird angegeben.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The bis-diphenyl-chromium(I) cation disproportionates slowly in aqueous or methanolic solution on irradiation or heating into bis-diphenyl-chromium(0) and Cr2+. In a secondary reaction favoured by OH-- and acetate ions, Cr2+ reduces the surplus Cr(I)-compound to the Cr(0)-compound.The disproportionation in the presence of methanol and dipyridyl yields the Cr(0)-compound and the tris-dipyridyl-Cr(II) complex which reacts very slowly with the Cr(0)-compound forming the corresponding Cr(I)-complex.
    Notes: Beim Belichten oder Erhitzen wäßriger oder methanolischer Bis-diphenyl-chrom(I)-Salzlösungen erfolgt in sehr langsamer Reaktion eine Disproportionierung des Bis-diphenyl-chrom(I)-Kations, wobei sich Bis-diphenyl-chrom(0) und Chrom(II)-Ionen bilden. In einer Sekundärreaktion reduzieren die Chrom(II)-Ionen noch nicht zersetztes Bisdiphenyl-chrom(I)-Salz zum Nullkomplex. Das Ausmaß, in dem diese Sekundärreaktion stattfindet, hängt von den in der Lösung vorhandenen Anionen ab. Sie wird durch OH--Ionen und Acetat-Ionen besonders begünstigt.Erfolgt die Disproportionierung des Bis-diphenyl-chrom(I)-chlorides in Methanol in Gegenwart von Dipyridyl, so bildet sich neben der Nullverbindung der Tris-dipyridylchrom(II)-Komplex, der anschließend äußerst langsam mit dem Bis-diphenylchrom(0) reagiert, wobei der entsprechende Komplex der Chrom(I)-Stufe entsteht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chalcogenide Glasses with Organic Components. III. Poly-4,4′-diarsabiphenylene and Glasses of the Composition Se100-3xAs2xBx (B = Biphenylene)The Poly-4,4′-diarsabiphenyle is prepared and described for the first time. It is synthesized easely by reduction of biphenylene-4,4′-diarsonic acid with hypophosphoric acid. Analytical and i.r. spectroscopic results suggest a disordered structure. Poly-4,4′-diarsabiphenyle reacts with elemental Selenium giving the glasses Se100-3x(BAs2)x. The reaction takes place in the solid state. The glasses shows transformation temperatures increasing slightly with 4,4′-diarsabiphenyle content. A modell of the structure of these glasses is proposed.
    Notes: Über die Darstellung von Poly-4,′4-diarsabiphenyl durch Reduktion von Biphenylen-4,4′-diarsonsäure mit Unterphosphoriger Säure wird berichtet. Die Umsetzung mit elementarem Selen führt zu Gläsern der Zusammensetzung Se100-3xAs2xBx (B = —C6H4—C6H4—). dabei findet die Reaktion im festen Zustand statt. Die Transformationstemperaturen der Gläser steigen mit zunehmendem Gehalt an 4,4′-Diarsabiphenyl-Einheiten leicht an. Für die Gläser wird ein Strukturmodell vorgeschlagen.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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