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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 564 (1988), S. 72-80 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Method for the Identification of T-Atom Vacancies in the Lattices of ZeolitesSilanol groups in the lattices of zeolites can be silylated with trimethylchlorosilane and the products can be characterized by means of 29Si (CP) MAS NMR. T-atom vacancies are indicated by the formation of silylation products with three or four siloxy-linkages under mild reaction conditions as this requires the presence of three or silanol groups in favourable geometrical arrangements.
    Notes: Am Beispiel der Zeolithe ZSM-5 und Y wird gezeigt, wie amn Gitter-Leer-stellen in Zeolithen identifizieren kann. Terminale Hydroxylgruppen, die auch Gitter-Leerstellen umgeben, werden dabei mit Trimethylchlorsilan (TCS) silyliert und die Produkte mit 29Si-(CP)-MAS-NMR untersucht. Die Anwesenheit von Gitter-Leerstellen wird angezeigt durch die Bildung von Silylierungsprodukten mit drei oder vier Siloxybindungen, die Insertion des TCS zwischen drei beziehungsweise vier terminalen Hydroxylgruppen im Zeolithgitter unter sehr milden Reaktions bedingungen entstehen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 10 (1971), S. 356-356 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 83 (1971), S. 335-335 
    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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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 106 (1996), S. 317-324 
    ISSN: 1432-1939
    Keywords: Parasitoid ; Population dynamics ; Dispersal ; Tephritidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extent of within-patch dispersal by a tephritid fly and its four major parasitoids was examined over three field seasons. Hosts and parasitoids were marked using acrylic paint and observed as they oviposited into the flowerheads of marsh thistle, Cirsium palustre. The average recapture rate pooled across all species was 22%. The four parasitoids showed consistently greater rates of movement than the host in all three years. In nearly all comparisons, male dispersal was less than female dispersal. There was no evidence that parasitoids moved longer distances after visiting low quality rather than high quality patches. In the one season it was studied, no correlations between movement and insect size were observed. The relevance of these observations to host-parasitoid population dynamics is discussed.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 103 (1995), S. 196-202 
    ISSN: 1432-1939
    Keywords: Invasion ; Dispersal ; Population dynamics ; Leaf miner ; Spatial scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the spread of a small leaf-mining moth [Phyllonorycter leucographella (Zeller), Gracillariidae] after its accidental introduction into the British Isles. At large geographical scales, previous work had shown the spread to be well described by a travelling weve of constant velocity. Here, we report the pattern of spread at scales of 1 km2. By locating all bushes of the insect's foodplant (Pyracantha spp.) within 1-km2 quadrats, the precise pattern of colonisation at finer spatial scales could be established. Where the 1-km2 site was colonised by moths from the main advancing front, no spatial pattern in the order that bushes were infested was found. If the source of colonisation was a single or small group of infested plants within the site, there was some evidence that nearby plants were colonised first. We found no evidence of population turnover after colonisation. We interpret the results in terms of a two-stage model of invasion that produces different patterns at small and large geographical scales.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 334 (1965), S. 304-311 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The vibrational behaviour of the hexanitrocobaltate(III) ion is described in terms of a model where the ion is built up out of three planar O2N—M—NO2 D2h-units which are perpendicular to each other. It is them shown that this model adequately explains the observed infra-red spectra of both the unperturbed ion in the cubic salts M3[Co(NO2)6] ans NaM2Co(NO2)6, where M = K+, Rb+, Cs+ and NH4+, and the distorted ion in the monoclinic salt Na[(CH3)4N]2[Co(NO2)6]. It is also shown that the sodium salt Na3[Co(NO2)6] is not isomorphous with the cubic alkali salts; the hexanitrocobaltate(III) ion is also distorted in this lattice.
    Notes: Die Schwingungen des Hexanitrokobaltat(III)-ions werden analysiert, als ob das Ion aus drei voneinander unabhängigen planaren D2h-Systemen O2N—M—NO2 aufgebaut sei, die senkrecht aufeinander stehen. Es wird gezeigt, daß diese Vorstellung das ultrarote Spektrum sowohl des nicht verzerrten Ions in den kubischen Salzen M3Co(NO2)6 und NaM2Co(NO2)6, wo M = K+, Rb+, Cs+ oder NH4+ als auch das des verzerrten Ions in dem monoklinen Salz Na[CH3)4N]2Co(NO2)6 erklärt. Es wird gezeigt, daß das Natrium-Hexanitrokobaltat(III) mit den kubischen Alkalisalzen nicht isomorph ist; das Co(NO2)63--Ion ist in diesem Gitter ebenfalls verzerrt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 1 (1973), S. 605-618 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The vibrational spectra of BaCrO4 and BaSeO4 were recorded at 295K and 77K. The Raman spectrum of BaCrO4 melt was also recorded, using the energy of an argon laser beam as a heat source. The spectra of the two compounds proved to be remarkably different, although they belong to the same space group and are said to have the same structure. Evidence was found that the principles of mutual exclusion and inversion doubling are effective in both compounds; these are due to rather strong interionic coupling. An assignment could only be made for the most prominent bands.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 1 (1973), S. 619-627 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of SrSeO4 and PbSeO4, in the form of crystalline powders have been recorded at 295K and 77K and the infrared transmission spectra of these compounds have been recorded from nujol mulls at 295 K. The spectra of these monoclinic compounds were found to be rather complicated, especially in the case of PbSeO4. Evidence was again found, as in a previous publication [1], that the principles of mutual exclusion and inversion doubling are effective in SrSeO4 and PbSeO4. It would seem that interionic coupling is even more pronounced in monoclinic SrSeO4 and PbSeO4 than in orthorhombic BaCrO4 and BaSeO4. An assignment of the most prominent bands was based on comparative data of similar compounds containing the XO4 group.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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