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  • 36.40  (3)
  • Microtubule  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Microtubule organizing centers in plant cells: localization of a 49 kDa protein that is immunologically cross-reactive to a 51 kDa protein from sea urchin centrosomes in synchronized tobacco BY-2 cells (1993)
    Springer
    Protoplasma 176 (1993), S. 64-74 
    Details
    ISSN: 1615-6102
    Keywords: Cell cycle ; Microtubule ; Microtubule organizing center ; Synchronization ; Tobacco BY-2 cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 49 kDa protein in tobacco BY-2 cells has been found to be cross-reactive with antibodies raised against a 51 kDa protein that was isolated from sea urchin centrosomes and identified as a microtubule-organizing center (MTOC) in animal cells. Tracing the fate of the 49 kDa protein during progression of the cell cycle in highly synchronized tobacco BY-2 cells revealed that this protein was colocalized with plant microtubules (MTs): the location of the 49 kDa protein coincided with preprophase bands (PPBs), mitotic spindles and phragmoplasts. Furthermore, between the M and G1 phases, the 49 kDa protein was observed in the perinuclear regions, in which the initials of MTs are organizing to form cortical MTs. At the G1 phase the location of the 49 kDa protein in the cell cortex coincided with that of the cortical MTs. It appeared that the 49 kDa protein in the cell cortex was transported as granules from the perinuclear regions. Thus, it is highly probable that the 49 kDa protein, which reacts with antibodies against the 51 kDa protein in sea urchin centrosomes, plays the role of an MTOC in plant cells. Thus, the mechanisms for organizing MTs in higher organisms appear to share a common protein, even though the organization of MTs is superficially very different in plant and animal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378940
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  • 2
    Electronic Resource
    Electronic Resource
    The role of microfilaments in the organization and orientation of microtubules during the cell cycle transition from M phase to G1 phase in tobacco BY-2 cells (1998)
    Springer
    Protoplasma 202 (1998), S. 105-114 
    Details
    ISSN: 1615-6102
    Keywords: Cell cycle ; Elongation factor 1α ; Microfilament ; Microtubule ; Tobacco BY-2 cell line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During cell cycle transition from M to G1 phase, micro-tubules (MTs), organized on the perinuclear region, reached the cell cortex. Microfilaments (MFs) were not involved in this process, however, MFs accumulated to form a ring-like structure in the division plane and from there they elongated toward the distal end in the cell cortex. Subsequently, when MTs elongated along the long axis of the cells, towards the distal end, the MTs ran into and then associated with the predeveloped MFs in the cell cortex, suggesting the involvement of MFs in organizing the parallel oriented MTs in the cell cortex. When cortical MTs were formed in the direction transverse to the long axis of cells, the two structures were again closely associated. Therefore, with regards to the determination of the direction of organizing MTs, predeveloped MFs may have guided the orientation of MTs at the initial stage. Disorganization of MFs in this period, by cytochalasins, prevented the organization of cortical MTs, and resulted in the appearance of abnormal MT configurations. We thus demonstrate the involvement of MFs in determining the orientation and organization of cortical MTs, and discuss the possible role of MFs during this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280879
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  • 3
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy of (CO2)n(H2O) m − clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 367-369 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoelectron spectra of (CO2)nH2O− (2≤n≤8) and (CO2)n(H2O) 2 − (1≤n≤2) were measured at the photon energy of 3.49 eV. The spectra show unresolved broad features, which are approximated by Gaussians. The vertical detachment energies (VDEs) were determined as a function of the cluster size. For (CO2)nH2O−, the VDE-n plots exhibit a sharp discontinuity between n=3 and 4; the VDE value is ≈3.5 eV at n=3, while it drops down abruptly to 2.59 eV at n=4. This discontinuity in VDE is ascribed to "core switching" at n=4; a C2O 4 − dimer anion forms the core of (CO2)nH2O− for n≤3, while a monomer CO 2 − is the core for n≥4. The (CO2)2(H2O) 2 − ion has a VDE of 2.33 eV, indicating the presence of a CO 2 − monomer core in the binary clusters containing two H2O molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429197
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  • 4
    Electronic Resource
    Electronic Resource
    A mechanism of electron attachment to small clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 291-292 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.50.H ; 34.80.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Van der Waals clusters of various molecules were collisionally ionized by high-Rydberg rare gas atoms and slow electrons. Negative cluster ions thus produced were detected by mass spectroscopy. The ionization mechanism were investigated by measurements of the size- and the energy-dependences of the electron attachment cross sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426959
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  • 5
    Electronic Resource
    Electronic Resource
    Photofragmentation of cluster ions: the visible photoabsorption spectrum of Ar2N 2 + (1991)
    Springer
    The European physical journal 20 (1991), S. 153-155 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.80 ; 33.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absolute cross section for photodissociation of Ar2N 2 + was measured as a function of wavelength in the 470–550 nm range. A structureless broad band was observed; the cross section has a maximum of ∼ 210 × 10−18 cm2 at ∼ 500 nm. The measurement of the photofragment time-of-flight spectrum shows that(1) N 2 + , Ar+ and Ar 2 + are produced in the photodissociation of Ar2N 2 + in the wavelength range studied, and that(2) the observed visible absorption band is ascribable to a parallel-type transition of Ar2N 2 + , which possibly retains a linear geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543961
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