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  • 1
    Electronic Resource
    Electronic Resource
    Organization of Photosynthetic Antenna Complex in Lipid Bilayers (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 623-626 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bacterial photosynthetic antenna complexes are composed of α-helical hydrophobicpolypeptides and pigments (e.g., bacteriochlorophyll a). We report here self-assembling properties ofan engineered hydrophobic polypeptide with zinc-substituted bacteriochlorophyll a ([Zn]-BChl a) invarious lipid bilayer to investigate the effect of lipid species on the self-assembling properties. Whenthe polypeptide and [Zn]-BChl a were mixed in surfactant solution (n-octyl β-D-glucopyranoside:OG) at 25°C, the absorption band [Zn]-BChl a was red-shifted from 770 to 812 nm, that is assignableto quasi-dimeric “subunit-type” complex. By subsequent dilution and cooling of the solution, theabsorption band further red-shifted to 836 nm indicative for progressed assembly, ‘LH1-type’complex. When the subunit-type complex was assembled in lipid bilayer, e.g., phosphatidylcholines(PC’s) and phosphatidylglycerol (PG’s), the assembling property to form LH1-type complexprominently depended on the character of their fatty acid chains in the phospholipids. The subunitcomplex remained in the fluidic bilayers, but further assembled to form LH1-type complex insolid-like phospholipid bilayers, suggesting that intermolecular force of phospholipid governs theassembling of the polypeptide/[Zn]-BChl a complex
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.623.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Catalytic action of comicelles containing imidazolyl and hydroxyl groups in the hydrolysis of enantiomeric esters
    Amsterdam : Elsevier
    Bioorganic Chemistry 13 (1985), S. 88-97 
    Details
    ISSN: 0045-2068
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0045-2068(85)90011-2
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  • 3
    Electronic Resource
    Electronic Resource
    Transport phenomena of sulfonated dyes into cellulose membrane: Effects of urea on parallel diffusion of mono azo dyes (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 784-789 
    Details
    ISSN: 1435-1536
    Keywords: Key words Sulfonated dye ; cellulose membrane ; urea ; parallel transport theory ; aggregation constant
    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  Effects of urea on transport phenomena of sulfonated azo dyes with different aggregation constants into water-swollen cellulose membrane have been studied at 25–55 °C. The results were analyzed on the basis of a parallel transport theory of surface and pore diffusion. Addition of urea decreased equilibrium adsorption of the dyes onto cellulose and increased the surface and pore diffusivities for the parallel diffusion model of the dye with high aggreg-ation constant. Temperature dependence of the effects was also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050148
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of denaturants on the stability of light-harvesting complex (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 152-159 
    Details
    ISSN: 1435-1536
    Keywords: Key words Denaturants ; OG micelle ; bacteriochlorophyll ; reconstitution ; light-harvesting complex
    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 effect of denaturants such as urea and normal alcohols on the formation of light-harvesting (LH) polypeptides/bacteriochlorophyll a (BChla) complex (LH1 complex) in n-octyl-β-D-glucopyranoside (OG) micelle was examined to provide an insight into stability of the complex. The stabilities of the LH1 complex in OG micelle and of the complex in the chromatophore of photosynthetic bacteria were compared by addition of denaturants. The extent of stability of these complexes was monitored by the change in absorbance of Qy band of BChla in these complexes, resulting generally in the blue-shifting of the Qy band from near 870 nm to about 777 nm upon addition of these denaturants. Urea and guanidium hydrochloride (Gnd) showed a relatively weak denaturing effect. Normal alcohols showed stronger denaturing effect, depending on the hydrophobicity of the alcohols. These results imply that the stability of LH1 complex in OG micelle can be largely attributed to the hydrophobic interactions in the complex as well as that of the complex in the chromatophore of photosynthetic bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050223
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  • 5
    Electronic Resource
    Electronic Resource
    CPS GL 799 (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 70-76 
    Details
    ISSN: 1435-1536
    Keywords: Illuminationeffect ; adsorption ; diffusion ; cellulosemembrane ; directdye
    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 effect of illumination on transport of sulfonated bisazo direct dyes, CI Direct Yellow 12, and CI Direct Yellow 4, into a cellulose membrane has been studied at various temperatures. Transport of CI Direct Yellow 12, which exhibits photoinduced reversible trans-cis isomerism in aqueous solution into a cellulose membrane, was influenced by illumination. It is likely that the transport was influenced by transisomerization of the photoisomeric dye and the diffusivity was controlled by surface diffusion rather than by pore diffusion under both light and dark conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654661
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of modified polyethylenimines using triazine derivatives (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 1557-1563 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170170527
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  • 7
    Electronic Resource
    Electronic Resource
    Catalysis by polyethylenimine derivatives with two functional groups (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 1265-1273 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Modified polyethylenimines have been prepared containing imidazole and dimethylamine functionalities for catalytic purposes, as well as apolar groups to increase binding. The cooperative effect of the two functionalities increases the catalytic effectiveness of these polymers some 2-20-fold, depending on the kinetic parameters being compared.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160609
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  • 8
    Electronic Resource
    Electronic Resource
    Dyeing of cellulose by direct dye in aqueous sodium alginate solution (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 2159-2166 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Dyeing of cellulose by direct dye in aqueous sodium alginate solutions containing sodium chloride has been studied to interpret thermodynamically the role of sodium alginate on the adsorption equilibrium of dye on cotton. The result has been compared with that of sodium chloride (low-molecular inorganic electrolyte) by an adsorption model on cellulose. We have inferred, by the membrane-equilibrium theory, that the dye has been concetrated into the internal solution of cellulose because of the presence of sodium alginate in the bulk solution.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070251002
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  • 9
    Electronic Resource
    Electronic Resource
    Formose reaction by polymer-supported thiazolium salts (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2247-2250 
    Details
    ISSN: 0887-624X
    Keywords: polymer catalyst ; formose reaction ; thiazolium salt ; hydrocarbons ; dihydroxy acetone ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thiazolium salt polymers synthesized by quaternization of 4-(4′-vinylphenyl)thiazole (VPT) polymers with methyl iodide had a highly catalytic activity for “the formose reaction.” Their catalytic activities were comparable to that of a low molecular weight analog, 3-methyl-4-phenylthiazolium iodide (MPTI). In the reaction catalyzed by the polymer catalyst, a main product, dihydroxyacetone (DHA), was detected by gas-liquid chromatography. The polymer catalysts were easily recovered from the reaction mixture and reused with a sustained catalytic activity. © 1992 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080301021
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  • 10
    Electronic Resource
    Electronic Resource
    Acyloin condensation in aqueous system by durable polymer-supported thiazolium salt catalysts (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1711-1717 
    Details
    ISSN: 0887-624X
    Keywords: durable catalyst ; thiazolium salt ; aqueous system ; acyloin condensation ; enzyme model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We characterized three low-molecular-weight thiazolium salt analogues: N-methyl-5-(2′-benzyloxyethyl)-4-methylthiazolium iodide (MBMTI), N-methyl-4-phenylthiazolium iodide (MPTI), and N-methylbenzothiazolium iodide (MBTI). MBMTI, having high-electron density on the thiezolium ring, was found to be a durable thiazolium salt in buffer solution. Then, the polymer-supported thiazolium salt catalyst having MBMTI structure as a catalytic site for acyloin condensation was prepared by the polymerization of the corresponding thiazole monomer and the following quaternization. The polymer catalyst had excellent catalytic activity even in buffer solution, while the corresponding low molecular weight catalyst did not show any activity in aqueous system. Furthermore, the durable polymer catalyst could be reused under the aqueous condition. © 1994 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320913
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