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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: 1573-5028
    Keywords: Agrobacterium tumefaciens ; crown gall ; Nicotiana tabacum ; T-DNA structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Transformed clones from a shooty tobacco crown gall tumor, induced byAgrobacterium tumefaciens strain LBA1501, having a Tn1831 insertion in the auxin locus, were investigated for their T-DNA structure and expression. In addition to clones with the expected phenotype, i.e. phytohormone autonomy, regeneration of non-rooting shoots and octopine synthesis (Aut+Reg+Ocs+ 'type I' clones), clones were obtained with an aberrant phenotype. Among these were the Aut-Reg-Ocs+ 'type II' clones. Two shooty type I clones and three type II callus clones (all randomly chosen) as well as a rooting shoot regenerated from a type II clone via a high kinetin treatment, all had a T-DNA structure which differed significantly from ‘regular’ T-DNA structures. No Tn1831 DNA sequences were detected in these clones. The two type I clones were identical: they both contained the same highly truncated T-DNA segments. One TL-DNA segment of approximately 0.7 kb, originating form the left part of the TL-region, was present at one copy per diploid tobacco genome. Another segment with a maximum size of about 7 kb was derived from the right hand part of the TL-region and was present at minimally two copies. Three copies of a truncated TR-DNA segment were detected, probably starting at the right TR-DNA border repeat and ending halfway the regular TR-region. Indications have been obtained that at least some of the T-DNA segments are closely linked, sometimes via intervening plant DNA sequences. The type I clones harbored TL-DNA transcripts 4, 6a/b and 3 as well as TR-DNA transcript 0′. The type II clones harbored three to six highly truncated T-DNA segments, originating from the right part of the TL-region. In addition they had TR-DNA segments, similar to those of the type I clones. On Northern blots TR-DNA transcripts 0′ and 1′ were detected as well as the TL-DNA transcripts 3 and 6a/b and an 1800 bp hybrid transcript (tr.Y) containing gene 6b sequences. Possible origins of the observed irregularities in T-DNA structures are discussed in relation to fidelity of transformation of plant cells viaAgrobacterium.
    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
    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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