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  • 1
    Digitale Medien
    Digitale Medien
    Concentration and/or Removal of Metal Ions Using a Water-Soluble Chelating Polymer and a Microporous Hollow Fiber Membrane (1994)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 33 (1994), S. 904-906 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie00028a017
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  • 2
    Digitale Medien
    Digitale Medien
    Re-evaluation of ischemia-induced neuronal damage in hippocampal regions in the normothermic gerbil (1992)
    Springer
    Acta neuropathologica 85 (1992), S. 10-14 
    Details
    ISSN: 1432-0533
    Schlagwort(e): Cerebral ischemia ; Cell death ; Hippocampus ; Brain temperature ; Normothermia
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary It has not been discussed whether transient forebrain ischemia of 5-min duration, which is a model frequently used to evaluate pharmacological protection against ischemic injury, is an optimal model in the CA1 field of this animal whose brain temperature is maintained at normothermic levels. The temperature of the brain during an ischemic insult strongly affects the extent of the resulting neuronal injury. If the brain temperature is not regulated, it usually falls in the gerbil by 2°–4°C during 5-min ischemia. However, the brain temperature during ischemic insult was not regulated in many previous studies. In the present study, the effects of transient (1 to 5 min) forebrain ischemia on the development of neuronal degeneration in hippocampal regions of the gerbil whose brain temperature was maintained at 37°C were examined. In the CA1 field of the hippocampus, transient ischemia of 3- and 4-min duration caused almost the same maximal damage (88%–91% neuronal loss) as observed in the gerbils subjected to 5-min ischemia. Transient ischemia of 2-and 2.5-min duration provoked substantial neuronal damage in 25% and 55% of experimental gerbils, respectively. These results indicate that 5-min bilateral forebrain ischemia is more than is necessary to examine ischemiainduced neuronal degeneration in hippocampal CA1 field of the gerbil whose brain temperature is maintained at normothermic levels. In the normothermic gerbil brain, an ischemic period of 3-min already induces extensive neuronal death in the CA1 and, thus, constitutes a sensitive model to evaluate faint protective effects of drugs against ischemic injury in the normothermic gerbil.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00304628
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  • 3
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers. VIII. Radical copolymerization of ethyl 3-oxo-4-pentenoate and ethyl 4-methyl-3-oxo-4-pentenoate with 4-vinyl pyridine (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1323-1325 
    Details
    ISSN: 0887-624X
    Schlagwort(e): ethyl 3-oxo-4-pentenoates ; 4-vinyl pyridine ; complex formation ; copolymerization ; solvent effect ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1993.080310528
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  • 4
    Digitale Medien
    Digitale Medien
    Photochemical behavior of poly(ethylacryloylacetate) and poly(acryloylacetone) films (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3683-3688 
    Details
    ISSN: 0887-624X
    Schlagwort(e): poly(ethylacryloylacetate) ; poly(acryloylacetone) ; enol ; keto ; UV-irradiation ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Films of poly(ethylacryloylacetate) (PEAA) and poly(acryloylacetone) (PAA) were subjected to UV irradiation (λ = 254 nm) at room temperature. The photoinduced structure transfer from cis-enol onto a diketo forms has been investigated. The structure transfer caused by UV light was found to be slower than for the corresponding process in solution. The spectral investigations (UV, IR) showed reversible process of photoketonization. The results were analyzed in terms of the model for the participation of the trans-enol form in the process of the ketonization. Based on the results obtained, some general conclusions were made about the organization of the units in the polymer chain. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3683-3688, 1997
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers. VI. Solvent effects on polymerization and copolymerization of ethyl 4-methyl-3-oxo-4-pentenoate (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 855-863 
    Details
    ISSN: 0887-624X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The radical polymerization of ethyl 4-methyl-3-oxo-4-pentenoate (EMAA) was investigated at 60°C in benzene and acetonitrile. In both solvents, the kinetic results disagreed with the conventional model of radical polymerization. A remarkable solvent effect on monomer reactivity ratio was observed for the copolymerization of EMAA and styrene. Regression analysis of the monomer reactivity ratio with the solvatochromic parameters gives a good linear relationship, taking into account polarity and hydrogen-bond donating acidity of the solvent as the major factors.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1989.080270311
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  • 6
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers. III. Polymerization and copolymerization of 5-methyl-5-hexene-2,4-dione (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 529-532 
    Details
    ISSN: 0887-6258
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1986.140241006
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  • 7
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers, 1. Tautomerism and polymerization of ethyl 3-oxo-4-pentenoate (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1087-1095 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Solvent effects on the tautomerism and polymerization of ethyl 3-oxo-pentenoate (1) were studied. Regression analysis of the tautomeric constant reveals that the equilibria depend on the polarity and hydrogen-bond donor acidity of the solvents. The polymerization was investigated in benzene and acetonitrile. In both solvents, the kinetic results do not meet the conventional model of radical polymerization.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1986.021870505
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  • 8
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers, 4Part 3: cf.1.. Solvent effects in radical copolymerization of ethyl 3-oxo-4-pentenoate and styrene (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 371-377 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Ethyl 3-oxo-4-pentenoate (1) exhibits the coexistence of two tautomers, the ketonic and enolic form, and its tautomeric equilibrium shifts with the solvent. The monomer reactivity ratios for the radical copolymerization of 1 (M1) and styrene (M2) in various solvents were determined. There is a marked and a minor solvent effect on r1 and r2, respectively. Regression analysis of r1 with the solvatochromic parameters yields a fairly good linear relationship, taking into account three factors: polarity and hydrogen bond donating and accepting powers of the solvents.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1987.021880214
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  • 9
    Digitale Medien
    Digitale Medien
    Polymerizable tautomers, 9Part 8: cf. ref.1. Tautomerism and polymerization of vinyl acetoacetate (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1561-1567 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The keto/enol tautomeric constants of vinyl acetoacetate (1) were determined in various solvents. The tautomeric constants are significantly affected by the solvents, and the ketonic form is predominant in polar solvents. Regression analysis of the tautomeric constants with solvatochromic parameters gives a good linear correlation, taking into account, as major factors, polarity and hydrogen bond acceptor basicity of the solvent. The equilibria depend also on concentration and temperature. Copolymerization of 1 (M1) and styrene (M2) was carried out in benzene and acetonitrile. Monomer reactivity ratios were obtained as r1 = 0,08 and r2 = 9,36 in benzene, and r1 = 0,07 and r2 = 9,88 in acetonitrile. Q and e values of 1 were calculated to be 0,069 and -0,26 for copolymerization in benzene, and 0,062 and -0,19 for that in acetonitrile. Thus, the polymerization and copolymerization of 1 are not influenced by the solvents.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1993.021940604
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  • 10
    Digitale Medien
    Digitale Medien
    Solvent effect in radical copolymerization of styrene with p-aminostyrene (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 1007-1014 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: p-Aminostyrene (1, M1) and styrene (M2) were radically copolymerized at 60°C in various solvents. There is a significant solvent effect on monomer reactivity ratios, especially on r1, suggesting a specific interaction between the solvent and the polymer radical with the p-aminostyrene moiety at the terminal position. In order to clarify the solvent factor influencing the relative reactivity, the hydrogen-bond-accepting basicity of the solvent (β) was determined from enhanced UV shifts for 1 relative to N,N-dimethyl-p-aminostyrene. Regression analysis of r1 with the solvatochromic parameters revealed that β is the major factor responsible for r1-variations.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1989.021900509
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