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  • 1
    Electronic Resource
    Electronic Resource
    The surface periplast component of the protistKomma caudata (Cryptophyceae) self-assembles from a secreted high-molecular-mass polypeptide (1997)
    Springer
    Protoplasma 200 (1997), S. 186-197 
    Details
    ISSN: 1615-6102
    Keywords: Cryptophyceae ; Periplast ; Cell wall ; Self-assembly ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cell covering of the cryptomonadKomma caudata (Geitler) Hill is a trilaminar structure consisting of a surface periplast component (SPC) and an inner periplast component (IPC) that sandwich the plasma membrane. In order to investigate the development of the periplast, we have raised monoclonal antibodies against the cell surface ofK. caudata. Immunoblot analyses using one of these antibodies, K1/D.10, showed that it labeled a high-molecular-mass polypeptide. Immunofluorescence and pre- and post-embedding immunogold labeling studies demonstrated that the antibody recognized sites on the cell surface corresponding to the SPC plates and anotherK. caudata cell surface component, the rosulate scales. Labeling was also detected on surface domains devoid of periplast, namely the vestibular/gullet region of the cell. Post-embedding immunocytochemistry revealed that intracellular sites labeled with K1/D.10 included the Golgi apparatus and its associated vesicles. We propose that the subunits of theK. caudata cell covering are antigenically related molecules and that they self-assemble on the cell surface after secretion via the endomembrane system and deployment at the vestibular/gullet region or, in dividing cells, the cytokinetic furrow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283294
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  • 2
    Electronic Resource
    Electronic Resource
    103Rh chemical shifts and trans influence of ligands in rhodoximes and organorhodoximesInvestigations on Electronic Influence of Organyl Ligands, Part XII. For Part XI. see Ref. 2b. (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 984-987 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; 103Rh ; 31P ; 13C ; rhodoximes ; organobis(dimethylglyoximato) rhodium ; complexes ; trans influence ; coupling constants ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 103Rh NMR chemical shifts of rhodoximes [Rh(dmgH)2(PPh3)X] (1) and organorhodoximes [Rh(dmgH)2(L)R] (2, L = PPh3; 3, L = PMe3; 4, L = P(OPh)3; 5, L = SMe2; 6, L = py) were measured with a wide range of anionic ligands X, organo groups R and axial ligands L. The chemical shifts δ(103Rh) in the halide complexes 1 show the ‘normal halogen dependence’ (Cl 〉 Br 〉 I). δ(103Rh) in 2-6 depends on the axial base L in the order py 〉 SMe2 〉 PPh3 〉 P(OPh)3 ≍ PMe3 and in 2 on the organo group R in the order Et ≍ Me 〈 nPr 〈 CH2Ph ≍ CH2OMe 〈 CH2Br 〈 CH2Cl 〈 iPr 〈 Cy 〈 CH=CH2 〈 CH2SiMe3 〈 tBu 〈 cis-CH=CHPh ≍ cis-CH=CHPr 〈 Ph ≍ C≡CPh 〈 CPr=CH2. The coupling constants 1J(103Rh,31P) in 2 reflect the (NMR) trans influence of R. There is a strong correspondence between the NMR trans influence and the structural trans influence, as indicated by the bond lengths d(Rh - P).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260331209
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