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  • 1
    Electronic Resource
    Electronic Resource
    Intra–inter polyad mixing and breaking of symmetric–antisymmetric selection rule in the vibrational spectra of CS2 molecule (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6495-6508 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A laser system composed of tunable lasers pumped by a copper vapor laser (Oxford Lasers Cu60) is described in this paper. The high resolution obtained with this system has allowed excitation of selective rotational levels of the 15 V and 10 V vibrational bands of the V 1B2 excited electronic state of the CS2 molecule in its vapor phase (∼100 mTorr). The rotational assignment of the excitation spectra was accomplished by observing the dispersed fluorescence. We show that it is not necessary to use a supersonic jet in order to assign the emission spectra of CS2. The goal of this work is to study the highly excited vibrational states of the ground electronic state of CS2 up to the first dissociation limit. For our purpose, there are two important consequences of the particular geometry of the 15 V excitation, which is just below and close to the bending potential barrier of the V 1B2 state. First, a very good Franck–Condon overlap in the excitation and a large Franck–Condon access to high vibrational states, as high as 20 000 cm−1, allow observation of the dispersed fluorescence through a high resolution monochromator with an OMA detector. This avoids the need for more complicated techniques, like SEP spectroscopy. Moreover, we show for the first time, that, in the V 1B2 excited state, a strong Coriolis interaction Q32 Q3 Jc couples the bending (0,3,0) and antisymmetric stretching levels (0,0,1). This breaking of the symmetric–antisymmetric selection rule gives access to the antisymetric stretching levels of the ground electronic state X˜ Σ+g from the 15 V excitation. We also show that, below 12 000 cm−1, the vibrational couplings of CS2 can be described by a model of 2 degrees of freedom, which includes a strong 1:2 Fermi resonance and accidental resonant perturbations between adjacent polyads which is probably a first step in the transition to a chaotic regime in CS2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462887
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopy, dynamics, and chaos of the CS2 molecule: Fourier transform and phase-space analysis (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8744-8752 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we analyze the vibrational spectra of the Σ+g ground state of CS2, the experimental results of which have been described in a forth coming paper. We show that, up to 12 000 cm−1, CS2 can be described by a system of two degrees of freedom strongly coupled by a 1:2 type Fermi resonance. The corresponding vibrational spectra are refitted with the aid of only seven parameters. Analysis of the spectra by the statistical Fourier transform technique reveals stroboscopic effects between the symmetric stretching mode and the bending mode. The distinction between the "stroboscopic hole'' due to these effects and the "correlation hole'' due to nonintegrable terms in the Hamiltonian is discussed in detail. The study of the topology of the phase space of CS2 in the regular and chaotic cases is carried out in the basis described by a vibrational angular momentum which includes the Fermi resonance. We show the analogy between the localization of the wave packets of the eigenstates and the trajectories. We also show the destabilization of the trajectories due to a term in the Hamiltonian which couples neighboring polyads and which is a second Fermi resonance. We show that only two resonances are enough to induce a chaotic situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461210
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  • 3
    Electronic Resource
    Electronic Resource
    Components of partial resistance to Puccinia striiformis in barley (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 34 (1985), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Substantial differences in the rates of mycelial growth and sporulation of different isolates of Puccinia striiformis were observed when seedling and upper leaves of five barley cultivars with susceptible reaction types were inoculated. The highest rate of mycelial growth was usually on cv. Sultan, followed by Proctor, Astrix, Senta and Zephyr in that order, but more spores were produced on Senta and Astrix than on Proctor, Zephyr or seedlings of Sultan. Host-specific differences between isolates were slight, but some isolates were more aggressive than others, with generally higher mycelial growth and sporulation rates and shorter latent periods. The effect of temperature on sporulation varied little between cultivars or isolates, but there was some evidence of high temperature resistance in Senta and Zephyr. Latent periods were longer on flag leaves than on seedling leaves, and spore production per unit area of leaf infected was lower on the flag leaf of all cultivars except Sultan. Low sporulation rates seemed due to adult plant resistance in Astrix and Senta, and overall resistance, more strongly expressed in adult plants than in seedlings, in Proctor and Zephyr. Sultan exhibited slight seedling resistance, but lacked the adult plant resistance of other cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1985.tb02763.x
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  • 4
    Electronic Resource
    Electronic Resource
    Plant breeding for disease resistance (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 86-86 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the past few years, radical changes have taken place in the strategies used by plant breeders when breeding for resistance to plant pests and diseases. Following the discovery by Biffen in 1907 that resistance to a disease was often conferred by a single gene, known as a major gene, many ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279086a0
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  • 5
    Electronic Resource
    Electronic Resource
    Fusion Of Uredospore Germ Tubes in Puccinia graminis (1957)
    [s.l.] : Nature Publishing Group
    Nature 179 (1957), S. 483-484 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To our knowledge, there has been no report describing fusion between germ tubes without the prior formation of 'fusion bodies'. In the course of recent experiments on the germ tube development of P. g. tritici uredospores the sequence of events in volved in such a fusion was observed. The solution ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/179483a0
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  • 6
    Electronic Resource
    Electronic Resource
    Nucleic Acid Content of Haploid and Diploid Cells of Protomyces inundatus (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 836-837 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Stock cultures of P. inundatus were established on its natural host Apium nodiflorum, in the-greenhouse : chlamydospores formed readily in such infections. Single-spore cultures were established by means of a dummy objective from: (a) unfused endospores obtained from germinating chlamydospores; (6) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190836a0
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  • 7
    Electronic Resource
    Electronic Resource
    Photon echo relaxation in caesium perturbed by noble gases
    Amsterdam : Elsevier
    Optics Communications 49 (1984), S. 293-296 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(84)90195-0
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of temperature and light intensity on growth and sporulation of Puccinia striiformis on wheat (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 34 (1985), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Urediniospore production by Puccinia striiformis on wheat per unit leaf area infected was much lower at low light intensities than at high light intensities. The number of pustules per unit area of infected leaf and the daily sporulation rate per pustule increased linearly with increasing light over the range 10–50 W/m2. Increasing temperature between 7 and 20°C shortened latent period and reduced the longevity of sporulating leaves. Colonization rate and the frequency of pustules per unit area of infected leaf increased between 7 and 15°C but declined markedly at 20°C. Spore production reached its peak earlier and declined more rapidly with increasing temperature between 7 and 15°C. this decline being less marked in the highly susceptible cultivar Maris Beacon than in the more resistant Maris Nimrod and Maris Huntsman.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1985.tb01358.x
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  • 9
    Electronic Resource
    Electronic Resource
    Highly variable molecular karyotypes in the plant pathogen Colletotrichum gloeosporioides (1990)
    Springer
    Current genetics 18 (1990), S. 81-86 
    Details
    ISSN: 1432-0983
    Keywords: Anthracnose ; Chromosomes ; Genetic variation ; Pathogenic specialisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Isolates representing two types (A and B) of Colletotrichum gloeosporioides, which cause different anthracnose disease on the tropical pasture legumes Stylosanthes spp. in Australia, were found to have distinct electrophoretic karyotypes. Type A isolates had five large maxi-chromosomes (2–6 Mb) and eight to ten smaller mini-chromosomes (270–600 kb), while Type B isolates had three maxi chromosomes (4.7-〉6 Mb) and three to five mini-chromosomes (330–1200 kb). Extensive chromosomal polymorphisms for both length and number were observed in the mini-chromosomes amongst isolates within both types. Results indicate that chromosomal rearrangements may have a role in generating variation in this pathogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321120
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  • 10
    Electronic Resource
    Electronic Resource
    Human hypervariable minisatellite probes detect DNA polymorphisms in the fungus Colletotrichum gloeosporioides (1989)
    Springer
    Current genetics 16 (1989), S. 473-475 
    Details
    ISSN: 1432-0983
    Keywords: Restriction fragment length polymorphisms ; Fungi ; Minisatellite probes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The human minisatellite probes for hypervariable regions within the genome are able to detect restriction fragment length polymorphisms between subgroups of the filamentous fungus Colletotrichum gloeosporioides. The two types of this pathogen that cause anthracnose on Stylosanthes spp. in Australia were distinguishable using the polycore probes 33.6 and 33.15. This is the first report of the use of these versatile probes for detecting polymorphic DNA regions in fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340729
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