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  • 1
    ISSN: 1432-2048
    Keywords: Agrobacterium ; Crown-gall ; DNA, transferred ; Nicotiana (T-DNA) ; T-DNA structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data are provided which show that transferred DNA (T-DNA) present in Nicotiana plumbaginifolia crown-gall lines in most cases was scrambled and not intact. Both wild-type, and ‘rooter’- and ‘shooter’-type mutants of octopine-type Agrobacterium tumefaciens were used to infect N. plumbaginifolia plantlets, cultured in vitro. Resulting tumors were excised from the plantlets and cultured for more than three years. During subculturing the tumor lines were scored for the following phenotypic traits: phytohormone autonomous growth in vitro (Aut+), spontaneous shoot regeneration (Reg+), root deficiency of shoots (Rod+), octopine production (Ocs+) and mannopine and agropine production (Mas+Ags+). An unexpectedly large variety of phenotypes was observed. For instance, two out of three tumor lines induced on haploid plantlets by the rooter mutant LBA4210 regenerated shoots, a phenomenon which is not observed for octopine tobacco tumor lines. Fifty percent of the crown-gall lines studied did not contain octopine. Only one line out of six independent lines analyzed was found to have a ‘regular’ T-DNA structure. Occurrence of aberrant T-DNA structures was not correlated with the ploidy level of infected plantlets, nor with the T-region structure of the inciting bacterial strain. The pattern of TL-DNA transcripts was studied for one line and correlated well with the aberrant T-DNA structure detected. Segments of TR-DNA, having irregular structures as well, were detected in two out of the six lines studied. The scrambled nature of the TR-DNA explained the absence of mannopine and agropine in these two lines. In addition, it was observed that N. plumbaginifolia tissue lines which did not carry T-DNA, became readily phytohormone autotrophic (habituated) at an early stage in tissue culture.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Agrobacterium ; Crown gall ; Nicotiana (crown gall, T-DNA) ; Transformation (tobacco) ; Transferred DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grafts from the SR1 tobacco crown-gall lines NT1 (having a deletion eliminating part of the transferred (TL)-DNA auxin locus) and NT2 (having an IS60 insertion in gene 2 of this auxin locus) were cross-pollinated with pollen from nontransformed SR1 tobacco plants. One half of the resulting F1 progeny resembled the female parent (“transformed” NT1-like and NT2-like seedlings respectively) and one half resembled the male parent (“non-transformed” SR1-like seedlings). For three states of differentiation (callus, shoot, graft) all phenotypic markers of the transformed seedlings studied were identical to those of the transformed female parent. Most phenotypic markers of non-transformed seedlings corresponded with markers of the male parent. Unlike the SR1 male parent, however, the SR1-like seedlings showed the maternal traits hyperstyly and male sterility. These two traits were inherited by 100% of the F1 seedlings studied. Ninety percent of the non-transformed F2 seedlings were still male-sterile whereas in as much as 50–100% of the non-transformed F3 progeny, male fertility had been restored. The SR1-like F1 seedlings did not contain any T-DNA. At the level of restriction-fragment analysis the T-DNA structures of all 22 NT1-like seedlings examined were identical to the T-DNA structure of their female parent NT1. The steady-state level of transcripts 4 (cytokinin locus) and 6a/6b relative to transcript 3 (octopine-synthase locus) was less in shoots and grafts than in callus. Observed variation in shoot morphology among the twenty-two NT1-like seedlings was not correlated with T-DNA structure, organization and expression at the level of steady-state mRNA. The T-DNA structure of NT2 and its transformed seedlings deviated from regular border-to-border TL-DNA, in that it extended beyond the left border repeat.
    Type of Medium: Electronic Resource
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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