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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 1 (1978), S. 0 
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. A virulent, 2,3-butanediol positive culture of Aeromonas hydrophila, subspecies hydrophila, was fed or injected intraperitoneally into channel catfish. The positive infection and tissue involvement were monitored by the 2,3-butanediol test with tissue homogenate enriched with a buffered nutrient broth containing dextrose. The results revealed that the fish infected orally showed very little or no spleen involvement. Fish infected intraperitoneally, however, showed spleen involvement in a very short time, accompanied by the rapid onset of an acute systemic infection.Light and electron microscope studies of the spleen revealed that the pathogenic bacteria were mainly located within the reticular sheath of the ellipsoids and only sparsely in the surrounding regions, and that intense phagocytic activity of macro-phages had taken place in the ellipsoids. It was also observed that the phagocytized bacteria divide extracellularly, and probably intracellularly, resulting in the destruction of the endothelial and reticular cells of the ellipsoids. This finding substantiates the cytolytic and fibrolytic capacities of A. hydrophila for destroying host defence systems and may contribute to its invasive powers. Other cytological changes in cells in spleen after infection are described, and the resistance of A. hydrophila to intracellular enzymatic digestion by the macrophages is discussed.
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 12 (1971), S. 3915-3918 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Catena 2 (1975), S. 11-22 
    ISSN: 0341-8162
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography , Geosciences
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 4 (1971), S. 459-462 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ausgehend von den thermodynamischen Grundlagen wird die Siedepunktsabhängigkeit der Retentionszeiten diskutiert. Über eine Formel vonKlages, nach der sich das Quadrat der Siedetemperaturen organischer Stoffe als additive Moleküleigenschaft darstellt, lassen sich die Retentionszeiten in eine analytische Beziehung zur Kohlenstoffzahl setzen. Nach Linearisierung dieser Beziehung läßt sich das System derKovats'schen Indizes zwanglos einführen. Der Anwendungsbereich desKovats'schen Systems sowie einer Formel für die Totzeit kann auf diese Weise abgegrenzt werden.
    Abstract: Résumé Partant des principes de la thermodynamique, on étudie la relation existant entre les temps de rétention et les points d'ébullition. Au moyen d'une formule deKlages, dans laquelle le carré des températures d'ébullition des substances organiques est présenté comme une caractéristique supplémentaire des molécules, on peut établir une realtion analytique entre le temps de rétention et le nombre d'atomes de carbone. Après linéarisation de cette relation, le système des indices deKovats peut être introduit facilement. De cette façon on peut délimiter la zone d'application du système deKovats, et déterminer une formule de calcul du temps mort.
    Notes: Summary Based on basic thermodynamics, the dependence of the retention times on the boiling points is discussed. Using an equation derived byKlages, in which the square of the boiling temperatures of organic substances is presented as an additive quality of the molecules an analytical relationship may be established between the retention time and the carbon number. After linearization of this relation, theKovats index system can be introduced without any problem. In this way, the application range of theKovats system and of an equation for the gas holdup time can be determined.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 4 (1971), S. 561-564 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ausgehend von dem thermodynamischen Zusammenhang zwischen Retentionszeit und Dampfdruck eines Stoffes wird ein „Retentionssiedepunkt” eingeführt, der bei geeigneter Wahl der Versuchsbedingungen sehr nahe an den wahren Siedepunkt gerückt werden kann. Die bekannten Siedepunktstabellen können so als Identifikationshilfsmittel bei der gas-chromatographischen Analyse herangezogen werden. Diese Methode wird mit derKovats'schen Identifikations-methode kombiniert, die im wesentlichen Aufschluß darüber gibt, welche Versuchsbedingungen für eine genauere Analyse nach dem Retentionssiedepunkt-Verfahren eingestellt werden müssen. Die Retentionsindices können in entsprechende Retentionssiedepunkte rein formal umgerechnet und die kombinierte Identifikations-methode auf diese Weise vereinheitlicht werden.
    Abstract: Résamé Partant de la relation thermodynamique existant entre le temps de rétention et la tension de vapeur d'une substance, on a introduit la notion de «point d'ébullition déduit des données de rétention» qui, si on choisit convenable des conditions d'opératoires, peut être extrêmement voisin du vrai point d'ébullition. Ainsi, les tableaux de points d'ébullition peuvent aider à l'identification des substances lors des analyses par chromatographie en phase gazeuse. Ce procédé est combiné avec la méthode d'identification basée sur les indices deKovats qui indique essentiellement quelles sont les conditions d'essai à utiliser pour une analyse plus précise d'après la méthode du «point d'ébullition déduit des données de rétention». Par un calcul purement théorique, on peut convertir les indices de rétention en «points d'ébullition déduit des données de rétention» et unifier ainsi la méthode combinée d'identification.
    Notes: Summary Based on the thermodynamic relationship between retention time and vapour pressure of a substance, a “retention boiling point” is introduced which, with suitable selection of the working conditions, can be approximated very closely to the true boiling point. Thus the known boiling point tables can be used to assist in the idendification of compounds analyzed by gas chromatography. This method is being combined with the identification method ofKovats which essentially provides information on the test conditions to be used for a more precise analysis by the retention boiling point procedure. Through simple calculations, the retention indices can be converted into “retention boiling points”, and thus the two identification methods may be unified.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 38-40 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Low molecular siloxanes, silicagel, aluminium oxide, permutite, and perlite were dissolved by ammoniacal catechol solution. Silicagel was also dissolved by othero-diphenols. Low molecular silicon organic ester or complex compounds were crystallised from the reaction products of silicagel with catechol and 2,3-naphthalenediol. On orthoclase an insoluble brown cover was formed. The reaction ofo-diphenols with silicates may be important in soil formation.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 22 (1966), S. 515-516 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fine divided HF-etched quartz was dissolved in a 0.2M solution of pyrocatechol at pH 9.6. Between 17 and 40 °C the dissolution rate (v s ) follows the equation: logv s =0.0295 T-20.87 At 25 °Cv s amounts to 0.8 · 10−12 g cm−2 sec−1. With several phenols the dissolution rate of quartz decreases in the order: pyrocatechol 〉 pyrogallol 〉 2, 3-dihydroxynaphthalene.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 543-549 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of kaolinite with potassium hydroxide (1 to 9N) was investigated between 70 and 90°C. During a first period of the reaction the content of Si and Al in solution increased and reached a maximum in 100 to 240 minutes, depending on KOH concentration and temperature; then an amorphous aluminosilicate gel formed. After an induction period, again depending on KOH concentration and temperature, the concentrations of Si and Al decreased rapidly, due to the formation of a crystalline potassium aluminosilicate.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 30 (1947), S. 1303-1320 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Im Lösungsmittel konstanter ionaler Stärke einer 0,l -n. KC1- Lösung wurden die Konzentrationsaciditätskonstanten (apparent ionization const.) von Aniliniumion, den drei Anilinsulfosäuren, den drei Anilincarbonsäuren, von anilin-diessigsäure, den drei Anilin-diessigsäure-sulfosäuren und den drei Anilin-diessigsäure-carbon-säuren bestimmt. Bei den letzten 7 der erwähnten Substanzen wurde auch der Einfluss eines Zusatzes von 10 % Äthanol auf die Aciditätskonstanten untersucht. Der Zusammenhang mit der Konstitution der verschiedenen Säuren und ihrer Ionen wurde besprochen. Es wurde dabei gefunden, dass das letzte der drei aciden Protonen der Anilindiessigsäure-o-carbonsäure und der Anilin-diessigsäure-o-sulfosäure am Stickstoff sitzt und die ionogenen Substituenten -SO3- und -CO2- seine Haftfestigkeit an dieser Stelle bedeutend erhöhen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 228-228 
    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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