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  • 1
    ISSN: 0168-9452
    Keywords: Alternaria alternata f.sp. lycopersici ; disease resistance ; host-specific toxins ; in vitro selection
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science 44 (1986), S. 37-46 
    ISSN: 0168-9452
    Keywords: Agrobacterium tumefaciens ; Southern blot hybridisation ; Vigna unguiculata ; kanamycin resistance ; leaf disc transformation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science 70 (1990), S. 231-241 
    ISSN: 0168-9452
    Keywords: Lycopersicon ; in vitro selection ; lincomycin resistance ; maternal inheritance ; mutagenesis ; protoplasts
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science 45 (1986), S. 201-208 
    ISSN: 0168-9452
    Keywords: Agrobacterium tumefaciens ; Lycopersicon esculentum ; Lycopersicon peruvianum ; kanamycin resistance ; regeneration ; tomato ; transformation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 194 (1930), S. 179-189 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 579 (1989), S. 211-220 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of Aluminium Hydroxide. I. Boehmite from Aluminium Nitrate and AmmoniaThe physical-chemical properties of mainly boehmite containing aluminium hydroxide are studied which were made by continuous precipitation from aluminium nitrate solution with ammonia liquor using technical raw materials and test conditions being very similar to those applied in production. The influence of the precipitation conditions (pH value, temperature, concentration and residence time in the precipitation solution) on the composition, structure and texture of the precipitation products is investigated and information about their effect on the filtration behaviour are given.In the case of a continuous precipitation it is possible to obtain phase-pure boehmite being relatively well crystallised. The crystallinity and dispersity of the precipitated hydroxide determine their filterability and the cavity structure.
    Notes: Es werden die physikalisch-chemischen Eigenschaften von vorwiegend Böhmit enthaltenden Aluminiumaquoxiden untersucht, die durch kontinuierliches Fällen aus Aluminiumnitratlösung mit Ammoniakwasser unter Verwendung technischer Rohstoffe und bei produktionsnaher Versuchsführung hergestellt wurden. Der Einfluß der Fällbedingungen (pH-Wert, Temperatur, Konzentration und Verweilzeit in der Fällsuspension) auf die chemische Zusammensetzung, Struktur und Textur der Fällprodukte wird erforscht und über deren Auswirkung auf das Filtrationsverhalten berichtet. Im Unterschied zur diskontinuierlichen Arbeitsweise kann bei kontinuierlichem Fällen bereits nach kurzen Verweilzeiten phasenreiner, relativ gut kristalliner Böhmit erhalten werden, dessen Filtrierbarkeit mit den morphologischen Eigenschaften der Niederschläge variiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 188-198 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of Aluminium Hydroxide. III. Peptization of Boehmite with Nitric AcidA reaction of the aluminium oxide hydroxide boehmite with nitric acid in dependence on the temperature and the molar ratio HNO3/Al2O3 is studied. The effect of the acid results in the formation of basic aluminium nitrates, which can change the rheological properties of the boehmite hydrogel due to redispersion or desaggregation up to its „liquefaction“ to boehmite hydrosol. For the dependence of the flow velocity of the boehmite hydrosol on the molar ration HNO3 Al2O3 a maximum correlation is characteristic. It can also be interpreted from the colloid-chemical point of view and it is a technically relevant indicator for the optimization of the peptization. By the peptization conditions of the boehmite hydrogel the pore structure of the Al2O3 can be varied in a carefully directed way.
    Notes: Es wird die Reaktion des Aluminiumoxidhydroxids Böhmit mit Salpete säure in Abhängigkeit von der Temperatur und dem molaren Verhältnis HNO3/Al2O3 untersucht. Die Säureeinwirkung führt zur Bildung basischer Aluminiumnitrate, die die rheologischen Eigenschaften des Böhmithydrogels infolge Redispergierung bzw. Desaggregation bis zu dessen „Verflüssigung“ zum Böhmithydrosol verändern. Für die Abhängigkeit der Fließgeschwindigkeit des Böhmit-hydrosols vom molaren Verhältnis HNO3/Al2O3 ist eine Maximumbeziehung charakteristisch. Sie ist aus kolloidchemischer Sicht interpretierbar und ein technisch relevanter Indikator für die Optimierung der Peptisationsbedingungen. Die Porenstruktur des Aluminiumoxids kann über die Peptisationsbedingungen des Böhmithydrogels gezielt variiert werden.
    Additional Material: 5 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: Preparation and Properties of Formed Aluminium Oxide. I. Influence of the Precipitation Conditions of the Boehmite Hydrogel on the Pore Structure of Formed Aluminium OxideA report is given on the influence of the precipitation conditions of boehmite (pH value, temperature, concentration and residence time in the precipitation suspension) on the cavity structure of aluminium oxide spheres, made by coagulation of boehmite hydrosol in ammonia liquor and subsequent thermal treatment at 110 and 600°C. The boehmite hydrogel was obtained at continuous precipitation conditions by neutralisation of sodium aluminate solution with nitric acid. It is shown that the difference in the pore structure of the formed aluminium oxide obtained by varying the precipitation conditions were caused by the special morphological features of the boehmite crystallization in the precipitation process.
    Notes: Es wird über den Einfluß der Bedingungen des Fällens von Böhmithydrogel (pH-Wert, Temperatur, Konzentration und Verweilzeit in der Fällsuspension) auf die Hohlraumstruktur von sphärischen Aluminiumoxidformlingen berichtet, die durch Koagulieren von Böhmithydrosol in Ammoniakwasser und nachfolgende thermische Behandlung bei 110 bzw. 600°C hergestellt wurden. Das Böhmithydrogel wurde im kontinuierlichen Fällregime durch Neutralisieren von Natriumaluminatlösung mit Salpetersäure erhalten. Es wird gezeigt, daß die in Abhängigkeit von den Fällbedingungen erhaltenen Unterschiede in der Porenstruktur des geformten Aluminiumoxids durch die morphologischen Besonderheiten des Böhmithydrogels verursacht werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of Formed Aluminium Oxide. II. Influence of the Mechanical Comminution of Precipitated Boehmite Hydrogel on the Pore Structure and Abrasion Resistance of the Aluminium OxideA report is given on the physical-chemical characteristics of formed aluminium oxide on the basis of boehmite which had been continuously precipitated with nitric acid from sodium aluminate solution, subsequently filtrated, dried at 110°C and ground prior to moulding.In double dependence on the grinding intensity (type of mill, grinding time) and on the precipitation conditions (pH value, temperature) the changes of the morphology and the texture of the boehmite hydrogel are investigated. According to the particles constituting the precipitated boehmite hydrogel is made in two stages. In dependence on the grinding intensity a maximum correlation is observed for the abrasion resistance.
    Notes: Es wird über die physikalisch-chemischen Charakteristika von geformtem Aluminiumoxid auf Basis von Böhmit berichtet, der aus Natriumaluminatlösung mit Salpetersäure kontinuierlich gefällt, nach Filtrieren bei 110deg;C getrocknet und vor der Formgebung gemahlen wurde. In zweifacher Abhängigkeit von der Mahlintensität und den Fällbedingungen werden die Veränderungen der Morphologie und Textur des Böhmithydrogels untersucht. Dem Dualismus in der Morphologie entsprechend erfolgt die Zerkleinerung der das gefällte Böhmithydrogel konstituierenden Teilchen zweistufig. Bei der Abriebfestigkeit des geformten Aluminiumoxids wird für die Abhängigkeit von der Mahlintensität eine Maximumbeziehung beobachtet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Solid Reactions in Catalysts and Catalyst Components. I. Solid Reactions in Catalysts for Autothermic Conversion of MethaneSolid reactions in the systems kaolin-NiO, kaolin-α-Al2O3NiO, and kaolin-MgO-NiO are described and investigated by means of X-ray measurements. Data on the reducibility of NiAl2O4 and on the dispersity of nickel on the supports are given. For further characterization of the samples electron-microscopic investigations have also been applied.
    Notes: Es werden die in den Systemen Kaolin-NiO,Kaolin-α-Al2O3-NiO und Kaolin-MgO-NiO ablaufenden Feststoffreaktionen beschrieben. Die Analyse der Reaktionsprodukte erfolgte mittels Röntgenuntersuchungen. Zur Reduzierbarkeit von NiAl2O4 sowie zum Dispersitätsverhalten von Nickel auf Katalysatorträgern werden Angaben gemacht. Elektronenoptische Untersuchungen dienten zur weiteren Charakterisierung der Proben.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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