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  • 1
    Electronic Resource
    Electronic Resource
    Chromosome Number of Human Endometrium (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 271-272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For some time past, I have been studying the chromosome number in human endometrium and also in the epithelial cells of the cervix uteri both in normal and in malignant conditions. The present communication is based on the study of the chromosomes of the human endometrium in the proliferative ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173271a0
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  • 2
    Electronic Resource
    Electronic Resource
    Calorimetric investigation of water/lecithin/cyclohexane microemulsions (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 823-830 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry ; lecitin reversed micelles ; oregno-gels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The enthalpies of dilution of water/lecithin/cyclohexane microemulsion-gels at variousR values (R=[water]/[lecithin]) and molar enthalpies of solution of water in lecithin/cyclohexane at a fixed lecithin concentration were determined calorimetrically at 25°C. Through a description of the process of dilution of water/lecithin/cyclohexane microemulsion-gels as one involving mainly the scission of lecithin reversed micelles in to smaller ones, the concentration dependence of the enthalpy was rationalized. Surprisingly, in order to account for the dilution enthalpies, it was not necessary to hypothesize a thermal effect arising from the breakage of the micellar network present in the micremulsion-gels. This result indicates that the building-up of the micellar network mainly arises from topological entanglements and steric hindrances among the lecithin reversed micelles. Attribution of the molar enthalpy of solution of water essentially to the thermal effect arising from the intermicellar aggregation process induced by the water addition allowed a rough estimation of the scission energy (the energy necessary to break an Avogadro's number of micelles) and of the micellar aggregation number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979212
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  • 3
    Electronic Resource
    Electronic Resource
    About entangled networks of worm-like micelles: a rejected hypothesis (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 809-818 
    Details
    ISSN: 1435-1536
    Keywords: Living polymers gels ; reverse micelles ; SANS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We report new results from small-angle neutron scattering ond 12-cyclohexane/lecithin/water micellar solutions performed as a function of the water content (w 0), temperature (T) and dispersed phase volume fraction (ϕ). The data from dilute samples are interpretable in terms of the existence of giant cylindrical reverse micelles and are well fit with a core-shell model (that provides the micelle structure and dimensions) with values of 28 and 45 Å for the inner core and the outer shell radii, almost independent on temperature and concentration. Such a result could appear consistent with the current idea that worm-like micelles are living polymers. On the contrary, the appearance of a sharp interference maximum at high concentrations (ϕ〉0.15) suggests arguments against the current hypothesis of an entangled network of giant flexible cylinders. Further arguments against the current hypothesis are given by the close similarity between the above described results and those from free of water micelles (for sure not cylinders). All the data are well fitted in terms of a unique model taking into account the micellar form factor plus a hard sphere structure factor. The data analysis suggests a micellar size distribution determined by the competition between concentration and interaction effects on which temperature plays not a minor role. Following our results, the current hypothesis of a gel structure in terms of an entangled network can be assumed as wrong and some caution has to be taken in assuming wormlike micelles as living polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654738
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  • 4
    Electronic Resource
    Electronic Resource
    Structural and dynamical investigation of gelation containing water-in-oil microemulsions (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 989-994 
    Details
    ISSN: 1435-1536
    Keywords: Gelatin ; water-in-oil microemulsions ; sol ; gel transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The gelatin (Bloom 300)/water/AOT/n-heptane system has been investigated at fixed water/AOT molar ratioR (R=31.1) as a function of the gelatin content. Several experimental techniques (densitometry, refractometry, conductometry, rheology, dielectrometry, ultrasonics, hypersonics) have been used to investigate the role played by the gelatin molecule in the observed sol-gel transition above a critical gelatin content. The results appear consistent with the hypothesis of a rigid network of gelatin-water rods coated by surfactant molecules coexisting with gelatin-free AOT reversed micelles at the gelation point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656629
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  • 5
    Electronic Resource
    Electronic Resource
    Study of lecithin reverse micelles by FT-IR spectroscopy (1997)
    Springer
    Colloid & polymer science 105 (1997), S. 220-223 
    Details
    ISSN: 1435-1536
    Keywords: Lecithin ; giant micelles ; organogels ; FT-IR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract FT-IR spectra of water/lecithin/deuterated cyclohexane microemulsions as a function of water/lecithin molar ratioR (R=[water]/[lecithin]) at various lecithin volume fractions (φ) have been recorded. After elimination of the spectral contributions due to the deuterated cyclohexane and normalization, the band parameters of the CO and PO4 vibrational modes due to lecithin have been found dependent only uponR. This behaviour has been interpreted in terms of a progressive structural modification of the water/lecithin interface superimposed to the progressive hydration of CO and PO4 groups. Moreover, no correlation between the CO and PO4 band parameters and the formation of gel-like micellar solutions has been found. This and other spectral features allow us to raise some doubts on the current structural picture of gel-like micellar solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188954
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