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  • Inorganic Chemistry  (3)
  • Lycopersicon esculentum  (1)
  • Lycopersicon peruvianum  (1)
  • 1990-1994  (5)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Induction of streptomycin resistance in the wild tomato Lycopersicon peruvianum (1990)
    Springer
    Molecular genetics and genomics 220 (1990), S. 261-268 
    Details
    ISSN: 1617-4623
    Keywords: Lycopersicon peruvianum ; Streptomycin resistance ; Mutagen NMU ; Protoplasts ; Chloroplast marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A protoplast mutagenesis and cell selection system was used for the isolation of streptomycin resistant Lycopersicon peruvianum colonies. Protoplasts were treated with the mutagen N-nitroso-methylurea and could be regenerated into fertile plants, carrying the streptomycin resistant character. Several classes of streptomycin resistance could be distinguished. Reciprocal crosses between streptomycin resistant and sensitive plants showed a non-Mendelian transmission of the resistance trait. Streptomycin resistance is the first selectable and maternally inherited cell organelle marker described in tomato.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260492
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular genetic characterisation of the Asc locus of tomato conferring resistance to the fungal pathogen Alternaria alternata f. sp. lycopersici (1994)
    Springer
    Euphytica 79 (1994), S. 205-217 
    Details
    ISSN: 1573-5060
    Keywords: AAL-toxins ; Alternaria alternata ; Asc locus ; Lycopersicon esculentum ; positional cloning ; transposon tagging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The Alternaria stem canker disease of tomato is caused by the fungal pathogen Alternaria alternata f. sp. lycopersici and its host-selective AAL-toxins. Resistance to the pathogen and insensitivity to the toxins are conferred by the Asc locus on chromosome 3L. Sensitivity to AAL-toxins is a relative character; the toxins inhibit development of all tested tomato tissues but susceptible cultivars are much more sensitive than resistant cultivars. In addition to tomato, some other plant and animal species are sensitive to the toxins as well. The likely mode of action of AAL-toxins is interference with sphingolipid biosynthesis by specific inhibition of ceramide synthase activity. To molecularly isolate Asc, transposon tagging and positional cloning strategies are applied. As a first step, transposon insertions and restriction fragment length polymorphism (RFLP) markers are identified in proximity of the Asc locus. Subsequently, the transposons are used to inactivate Asc by insertion mutagenesis, and the RFLP markers are used to identify yeast artificial chromosomes (YACs) with tomato DNA inserts. Once an Asc-insertion mutant and/or a YAC encompassing Asc has been obtained, physical isolation and characterisation of Asc will be conceivable. Elucidation of the molecular role of Asc will illuminate the specificity of host recognition by Alternaria alternata f. sp. lycopersici.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022521
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  • 3
    Electronic Resource
    Electronic Resource
    Herstellung und Eigenschaften von Aluminiumaquoxid. III. Peptisierung von Böhmit mit Salpetersäure (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 188-198 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19905800123
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  • 4
    Electronic Resource
    Electronic Resource
    Herstellung und Eigenschaften von geformtem Aluminiumoxid. I. Einfluß der Fällbedingungen des Böhmithydrogels auf die Porenstruktur des geformten Aluminiumoxids (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 199-206 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19905800124
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  • 5
    Electronic Resource
    Electronic Resource
    Herstellung und Eigenschaften von geformtem Aluminiumoxid. II. Einfluß der mechanischen Zerkleinerung gefällten Böhmithydrogels auf die Porenstruktur und die Abriebfestigkeit des geformten Aluminumoxids (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 207-216 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19905800125
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