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  • 1
    Electronic Resource
    Electronic Resource
    The “turn-over” technique for selective cerebral angiography (1994)
    Springer
    Neuroradiology 36 (1994), S. 123-124 
    Details
    ISSN: 1432-1920
    Keywords: Cerebral angiography ; Transfermoral route ; Conventional technique ; Turn-over technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In older patients with severe aortic atherosclerosis or pronounced tortuosity of the brachiocephalic vessels, selective catheterisation may be impossible. In order to overcome this difficulty we introduced a new “turn-over” technique. This involves introduction of a long guidewire through the catheter, advancing it and turning it over just above the aortic valves and finally introducing it into each major vessel, followed by the catheter. Selective catheterisation was completely achieved with the turn-over technique in 13 patients. Turning over the catheter just above the aortic valves and introducing it into the vessels was very easy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588076
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electro-kinetic Potentials of Ion-exchange Resin Particles (1964)
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 1110-1111 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The electro-kinetic potentials of ion-exchange particles are measured by the method of streaming potential. The apparatus is the same as Martin and Gorter's3 and the calculation of electro-kinetic potentials from streaming potentials is according to the Helmholtz-Smoluchowsky's equation. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2021110a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Swelling of poly(methacrylic acid) gels and adsorption of L-lysine and its polymer on the gels (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 873-879 
    Details
    ISSN: 1435-1536
    Keywords: Adsorption ; L-lysine ; oligo(L-lysine) ; poly(L-lysine) ; poly(methacrylic acid) gel ; swelling
    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 Poly (methacrylic acid) gels (PMAA gels) of various degrees of crosslinking were prepared and the dissociation behavior of these gels was examined; the swelling behavior was investigated as a function of the solution pH values. A reentrant phenomenon of swelling was observed and interpreted based on the Flory-Huggins equation and the Donnan equilibrium formula. Moreover, adsorption of L-lysine, oligo(L-lysine)s (Lys-n,n=3, 9, and 19) and poly(L-lysine) onto PMAA gels from aqueous solutions was investigated under different conditions of pH and concentration of adsorbate. The adsorption ratio of L-lysine onto PMAA gel is dependent on both the pH of solution and the degree of crosslinking. In a pH range between 8 and 9, the protonated form of L-lysine is strongly adsorbed on the PMAA gel by electrostatic interactions. Oligomers and polymer of L-lysine are adsorbed in a somewhat different way from the monomeric L-lysine. In addition, the desorption behavior of L-lysine from PMAA gels by a change in pH was also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657303
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photo-controlled extraction and active transport of amino acids by functional reversed micelles containing spiropyran derivatives (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 151-158 
    Details
    ISSN: 1435-1536
    Keywords: Reversed micelles ; spiropyran ; photochromic ; transport ; liquid membrane
    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 In a reversed micellarn-decane solution, a spiropyran derivative 3′,3′-dimethyl-1′-octadecyl-6-nitrospiro(2H-benzopyran-2,2′-indoline) (PC18) showed normal photochromism, and the reversed micelles provided polar microenvironment increasing stability of a zwitterionic merocyanine (MC) form of PC18. Though the reversed micelles of tetraethyleneglycol dodecylether (TEGDE) alone inn-decane had relatively low ability to extract amino acid from aqueous solutions, the PC18-incorporated TEGDE reversed micelles inn-decane showed good photo-controlled extraction of zwitterionic amino acid under UV-irradiation and release under VIS-irradiation. Extent of the extracted amino acid was higher for tryptophane (Trp) bearing hydrophobic side chain than alanine (Ala), showing amino acid selectivity. Photo-driven active transport of amino acid across a liquid membrane was attained by the PC18-incorporated TEGDE reversed micellar carrier in a water/n-decane/water three-phase system, where one side of an aqueous/organic interface was irradiated by the UV-light and the other side by the VIS-light. When Trp and Ala were present in the aqueous solution, Trp was selectively transported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658841
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    Paper (German National Licenses)
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