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  • 1
    Electronic Resource
    Electronic Resource
    Formation of overwintering structures of Uncinula necator and colonization of grapevine under field conditions (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 51 (2002), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Developing shoots of grapevine (Vitis vinifera cv. Kerner) were inoculated with conidia of the powdery mildew, Uncinula necator, at well-defined phenological stages of the host to provoke the development of flag shoots in the field and to investigate these shoots as early as possible in the following growing season for the presence of the pathogen. The disease progress was monitored and fungal growth and development on samples from a field trial were analysed by means of low-temperature scanning electron microscopy (LT–SEM). Mycelium was detected on the surface and in the interior parts of buds. The suitability of the field plot to analyse flag shoots was proven by the occurrence of such shoots in the following spring. Furthermore, early stages of cleistothecia development on berries were described for the first time. Establishment of U. necator in dormant buds of grapevine, giving rise to flag shoots in the following spring, is considered to play a significant role in overwintering of the pathogen in the vineyards of southern Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2002.00694.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aminodipeptidase inhibitor-induced cell death in quiescent lymphocytes: A review (2000)
    Springer
    Apoptosis 5 (2000), S. 319-322 
    Details
    ISSN: 1573-675X
    Keywords: aminodipeptidase ; caspase ; quiescence ; quiescent cell proline dipeptidase ; proteasome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We recently isolated and cloned an intracellular post-proline cleaving aminodipeptidase, quiescent cell proline dipeptidase (QPP), which has a substrate specificity very similar to that of dipeptidyl peptidase IV (CD26/DPPIV). Highly specific inhibitors of proline aminodipeptidases activate a novel apoptotic pathway in quiescent lymphocytes. The target of these inhibitors is not CD26/DPPIV, but appears to be QPP. The apoptosis pathway induced by the aminodipeptidase inhibitors is unusual in that it is restricted to quiescent lymphocytes, but not activated or transformed lymphocytes. The caspases activated in this apoptotic pathway are different from those activated in Fas or gamma-irradiation mediated cell death pathways, and furthermore, the proteasome appears to play a role in this death pathway. A large number of signal molecules including chemokines and cytokines have a highly conserved X-Pro motif on the N-terminus, rendering them potential substrates of QPP and players in the survival of resting lymphocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009675223443
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Power-law decay of collisionally excited amino acids and quenching by radiative cooling (2003)
    Springer
    The European physical journal 25 (2003), S. 139-148 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We have investigated the time dependence of the fragmentation of protonated amino acids stored at 22 keV in the electrostatic ring ELISA. The ions were produced in an electrospray source and after bunching in a quadrupole trap they were excited by collisions in a Ne gas. As in earlier studies of metal clusters and fullerenes produced in “hot” ion sources we find that the dissociation of metastable molecules follows approximately a 1/t decay law until a time $\tau$ after which the yield falls off much more rapidly. We interpret this reduction as a result of radiative cooling with a characteristic cooling time, $\tau_c \simeq G\tau$ , where G is the magnitude of the exponent in an Arrhenius expression for the rate of the dominant fragmentation process. The values of $\tau$ obtained from fits to the data are in the range 9-17 ms corresponding to cooling times of a few hundred milliseconds, in good accord with the expected rate of cooling by emission from IR-active vibrations. The power-law behaviour for $t 〈 \tau$ varies somewhat between the different amino acids, with powers between -0.9 and -1.1. We argue that this may be due to a competition between fragmentation channels with different Arrhenius parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjd/e2003-00093-9
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    Paper (German National Licenses)
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