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  • Cell & Developmental Biology  (2)
  • Calcium oxalate crystallization  (1)
  • D-Glucosamine hydrochloride  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chirospecific synthesis of D and Lp-chlorohomophenylalanine N-t-BOC DCHA salts (1994)
    Springer
    Amino acids 6 (1994), S. 97-105 
    Details
    ISSN: 1438-2199
    Keywords: Amino acids ; Chirospecific ; D-Glucosamine hydrochloride ; D-Mannosamine hydrochloride ; L-N-t-Butyloxycarbonylserinal ; D-N-t-Butyloxycarbonylserinal ; D-p-Chlorohomophenylalanine N-t-Boc DCHA salt ; L-p-Chlorohomophenylalanine N-t-Boc DCHA salt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The chirospecific conversions of D-glucosamine hydrochloride and D-mannosamine hydrochloride to the configurationally stable L and D isomers of N-t-butyloxycarbonylserinal were carried out byt-butylcarbonylation followed by sodium borohydride reduction and sodium meta-periodate oxidation. Reaction of the L and D aldehydes with the Wittig reagent prepared from 4-chlorobenzyltriphenylphosphonium chloride and butyl lithium followed by catalytic hydrogenation, Jones oxidation and salt formation with dicyclohexylamine gave the DCHA salts of the D and L isomers ofp-chlorohomophenylalanine N-t-Boc in high enatiomeric excess. The optical purity of the title compounds was established by hydrolysis to the respective free amino acids, followed by chiral derivatization and HPLC analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808125
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Calcium oxalate crystallization kinetics at different concentrations of human and artificial urine, with a constant calcium to oxalate ratio (1999)
    Springer
    Urological research 27 (1999), S. 231-237 
    Details
    ISSN: 1434-0879
    Keywords: Key words Calcium ; Oxalate ; Calcium oxalate crystallization ; MSMPR ; Urolithiasis ; Urine volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of in vitro dilution of artificial urine or human urine on the crystallization of calcium oxalate was examined in a mixed suspension, mixed product removal crystallization system. Direct growth inhibition by components of artificial urine was not significant and supersaturation was the dominant factor in determining crystal nucleation and growth rates. Dilution of human urine caused a decrease in crystal growth rate that was independent of the input calcium and oxalate concentrations, suggesting that dilution of growth inhibitors could be physiologically more important than any reduction in supersaturation. This loss of growth inhibition was counteracted by a reduction in nucleation promotion, with the net effect that the mass of crystals declined. Correlation of crystallization measurements with urinary concentration (osmotic pressure) confirmed these observations, with a negative relationship for growth rate and a positive relationship for nucleation rate and suspension density. Increasing the concentration of urine shifts the crystallization balance from low nucleation/high growth to high nucleation/low growth. Calcium oxalate crystalluria in healthy urine is therefore less likely at early stages of urine development in the nephron and the likelihood can be further reduced by increased fluid output. Our results suggest that lowering the heterogeneous nucleation activity by dilution is more than sufficient to override the loss of growth inhibition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002400050115
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of phosphorylated spindle-associated proteins in the diatom Stephanopyxis turris (1989)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 12 (1989), S. 33-41 
    Details
    ISSN: 0886-1544
    Keywords: phosphorylation ; MPM-2 ; mitotic spindle ; microtubule-associated protein ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Mitotic spindles isolated from the diatom Stephanopyxis turris become thiophosphorylated in the presence of ATPγS at specific locations within the mitotic apparatus, resulting in a stimulation of ATP-dependent spindle elongation in vitro. Here, using indirect immunofluorescence, we compare the staining pattern of an antibody against thiophosphorylated proteins to that of MPM-2, an antibody against mitosis-specific phosphoproteins, in isolated spindles. Both antibodies label spindle poles, kinetochores, and the midzone. Neither antibody exhibits reduced labeling in salt-extracted spindles, although prior salt extraction inhibits thiophosphorylation in ATPγS. Furthermore, both antibodies recognize a 205 kd band on immunoblots of spindle extracts. Microtubule-organizing centers and mitotic spindles label brightly with the MPM-2 antibody in intact cells. These results show that functional mitotic spindles isolated from S. turris are phosphorylated both in vivo and in vitro. We discuss the possible role of phosphorylated cytoskeletal proteins in the control of mitotic spindle function.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970120105
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  • 4
    Electronic Resource
    Electronic Resource
    Mammalian cell fusion III. A hela cell inducer of premature chromosome condensation active in cells from a variety of animal species (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 76 (1970), S. 151-157 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The phenomenon of premature chromosome condensation (PCC) is induced in unstimulated horse lymphocytes, bovine spermatozoa, Chinese hamster ovary cells, embryonic chick fibroblasts and erythrocytes, Xenopus kidney and mosquito cells by fusing each of these cell types with HeLa cells blocked in mitosis. Thus it becomes possible to visualize chromosomes even from non-multiplying cells of heterologous species, such as, chick erythrocytes and bovine spermatozoa.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040760204
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    Paper (German National Licenses)
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