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  • Microtubule  (2)
  • Nicotiana  (2)
  • Theaceae  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Aluminium kinetics in the tea plant using ^2^7Al and ^1^9F NMR
    Amsterdam : Elsevier
    Phytochemistry 32 (1993), S. 771-775 
    Details
    ISSN: 0031-9422
    Keywords: Camellia sinensis ; Theaceae ; ^1^9F NMR ; ^2^7Al NMR ; aluminium complexes ; catechin ; fluorine ; kinetics.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(93)85202-3
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Purine base pattern of camellia irrawadiensis
    Amsterdam : Elsevier
    Phytochemistry 24 (1985), S. 2271-2272 
    Details
    ISSN: 0031-9422
    Keywords: C. sinensis ; Camellia irrawadiensis ; Theaceae ; caffeine ; leaf. ; tea ; theobromine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)83024-1
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  • 3
    Electronic Resource
    Electronic Resource
    Enrichment of heterokaryocytes between mesophyll and epidermis protoplasts by density gradient centrifugation after electric fusion (1987)
    Springer
    Theoretical and applied genetics 75 (1987), S. 26-29 
    Details
    ISSN: 1432-2242
    Keywords: Density gradient centrifugation ; Electric fusion ; Epidermis protoplasts ; Heterokaryocyte enrichment ; Mesophyll protoplasts ; Nicotiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mesophyll protoplasts from Nicotiana glauca were fused with epidermal protoplasts from N. langsdorffii by an electric pulse. After the fusion products were centrifuged on stepwise density gradient centrifugation using Percoll and sea water, somatic hybrids were observed at 70%–80% in the fraction recovered from the intermediate specific gravity fraction between epidermis and mesophyll protoplasts. From offsprings of these somatic hybrids, teratomatous plants were regenerated. Since the difference of specific gravity between mesophyll and epidermis protoplasts is inherent, this procedure can be essentially applied to obtain somatic hybrids between any combination of plants. The significance of this study is discussed in relation to obtaining somatic hybrids between plant materials without any appropriate genetic markers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249137
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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Organization of heterogeneous mitochondrial DNA molecules in mitochondrial nuclei of cultured tobacco cells (1993)
    Springer
    Protoplasma 175 (1993), S. 112-120 
    Details
    ISSN: 1615-6102
    Keywords: Cell culture ; DNA content ; Mitochondrial DNA ; Mitochondrial genome ; Nicotiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The molecular size of mitochondrial DNA (mtDNA) molecules and the number of copies of mtDNA per mitochondrion were evaluated from cultured cells of the tobacco BY-2 line derived fromNicotiana tabacum L. cv. Bright Yellow-2. To determine the DNA content per mitochondrion, protoplasts of cultured cells were stained with 4′,6-diamidino-2-phenylindole (DAPI), and the intensity of the fluorescence emitted from the mitochondrial nuclei (mt-nuclei) was measured with a video-intensified photon counting microscope system (VIM system). Each mitochondrion except for those undergoing a division contained one mt-nucleus. The most frequently measured size of the DNA in the mitochondria was between 120 and 200 kilobase pairs (kbp) throughout the course of culture of the tobacco cells. Mitochondria containing more than 200 kbp of DNA increased significantly in number 24 h after transfer of the cells into fresh medium but their number fell as the culture continued. Because division of mitochondria began soon after transfer of the cells into fresh medium and continued for 3 days, the change of the DNA content per mitochondrion during the culture must correspond to DNA synthesis of mitochondria in the course of mitochondrial division. By contrast, the analyses of products of digestion by restriction endonucleases indicated that the genome size of the mtDNA was at least 270 kbp. Electron microscopy revealed that mtDNAs were circular molecules and their length ranged from 1 to 35 μm, and 60% of them ranged from 7 to 11 μrn. These results indicate that the mitochondrial genome in tobacco cells consists of multiple species of mtDNA molecules, and mitochondria do not contain all the mtDNA species. Therefore, mitochondria are heterogeneous in mtDNA composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01385008
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    Paper (German National Licenses)
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  • 6
    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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