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  • 1
    Electronic Resource
    Electronic Resource
    Mathematical modeling of the concentration dependence of competitive binding of counterions in polyelectrolytes (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 3983-3986 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00200a029
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  • 2
    Electronic Resource
    Electronic Resource
    Alkylation of tetrazolo[1,5-a]pyridine and its benzolog3s (annelation effect) (1988)
    s.l. : American Chemical Society
    The @journal of organic chemistry 53 (1988), S. 973-975 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00240a007
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  • 3
    Electronic Resource
    Electronic Resource
    Change of diffusion coefficients during sodium diffusion intoα-Al2O3 (1986)
    Springer
    Journal of materials science 5 (1986), S. 484-486 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01672371
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  • 4
    Electronic Resource
    Electronic Resource
    Über N1- und N2-substituierte 2-Amino-5,6-dihydro-4(1H)-pyrimidinone (1985)
    Springer
    Monatshefte für Chemie 116 (1985), S. 237-251 
    Details
    ISSN: 1434-4475
    Keywords: Acrylic acid methylester, reactions ; Guanidines, mono- and N,N-disubstituted ; Propionamide, 3-ethoxy-N-[morpholino(amino)methylene] ; 4 (1H)-Pyrimidinones, 2-amino ; Pyrimidine-1-propionic acid ethylester, hexahydro-4-oxo-2-thioxo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reactions of the monosubstituted guanidines2 b-h with methyl acrylate in dimethylformamide or ethanol as solvent preferentially afford 1-substituted 2-amino-5,6-dihydro-4(1H)-pyrimidinones6 b-h. The structures of 1-hexyl- and 1-benzyl-4-pyrimidinones6 c, e and of the picrate of 1-phenylpyrimidinone6 g were proved by comparison with authentic samples, which were prepared from N-substituted ethyl 3-amino-propionates14 c, e andg and cyanamide. Accordingly,6 g is not identical with authentic 2-phenylaminopyrimidinone7 g (prepared from 2-methylthio-4-pyrimidinone10 and 2-thioxo-4-pyrimidinone12 respectively, compare10). N,N-Disubstituted guanidines2 i-m react with methyl acrylate in dimethylformamide as solvent to afford N2,N2-disubstituted 2-amino-5,6-dihydro-4-(1H)-pyrimidinones7 i-m. Action of morpholine-4-carboxamidine (21) on methyl acrylate in ethanol yields 2-morpholinopyrimidinone71 as byproduct and 3-ethoxy-N-[morpholino(amino)methylene]propionamide (91) as mainproduct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798460
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  • 5
    Electronic Resource
    Electronic Resource
    Solvation of amino acid residues in water and urea-water mixtures: Volumes and heat capacities of 20 amino acids in water and in 8 molar urea at 25°C (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 109-128 
    Details
    ISSN: 1572-8927
    Keywords: Amino acid ; peptide ; protein ; heat capacity ; specific heat ; volume ; density ; hydrophobic, surface area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The limiting partial molar volumes V o and heat capacities C p o of 20 amino acids have been determined in water and in 8 molar urea at 25.0°C using flow calorimetry and flow densimetry. The side chain contributions to V o and C p o were obtained as the difference between the properties of the various amino acids and those of glycine, both in water and in 8M urea. The solvent accessible surface area of the amino acid residues were obtained using a method developed by Hermann, and the total surface areas were separated into their hydrophobic A Hb and hydrophilic components. In water, C p o values for the various residues C p o (R) were found well correlated with A Hb , though much less so in the urea solution. Hence, C p o (R) values, in water yield a good estimate of side chain hydrophobicity, but the (water→urea) transfer heat capacities appear strongly affected by specific solvation effects in the urea solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646283
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  • 6
    Electronic Resource
    Electronic Resource
    Phase I trial of the polyelectrolyte carbetimer administered i.v. once every four weeks (1988)
    Springer
    Investigational new drugs 6 (1988), S. 189-194 
    Details
    ISSN: 1573-0646
    Keywords: carbetimer ; phase I trial ; cancer patients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Carbetimer, a new synthetic low molecular weight polyelectrolyte with a novel structure displayed antitumor activiy in a number of animal tumor model systems and in vitro investigations. Based on these findings it was brought to a phase I clinical trial in patients with advanced malignant disease after failure of conventional treatment or with no conventional treatment available. Forty-eight patients received 98 courses. The schedule was a one hour i.v. infusion every four weeks. The starting dose was 180 mg/m2 and dose escalation was performed according to a modified Fibonacci formula up to 16,690 mg/m2. At least three patients were treated at each dose level and each patient was eligible to receive repeat courses at the same dose, until progressive disease or dose-limiting toxicity intervened. No hematological toxicity was encountered. Some adverse effects such as reversible proteinuria, hypercalcaemia, pain at infusion site, nausea and vomiting and fatigue were seen partly in a dose-related manner but did not represent the maximum tolerated dose (MTD). The limiting toxicity at the highest dose level of 16,690 mg/m2 consisted of ocular symptoms (‘light flashes’) accompanied by a modest decrease of blood pressure and nausea or vomiting during a one hour infusion. 16,690 mg/m2/1 hour was considered the MTD. There were four deaths on study, all considered diseaserelated. Fourteen patients had stable disease for more than two courses, which, however, could also be explained by the natural course of disease. No clear-cut antitumor responses were noted in our study center. The recommended dose for phase II trials derived from our results is 12,550 mg/m2/2 hours. However, with regard to experiences in other phase I studies, the subsequent phase II studies will be performed with a dose of 6,500 mg/m2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175396
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  • 7
    Electronic Resource
    Electronic Resource
    Thermodynamics of miscible polymer blends using a concentration-dependent χ parameter (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1769-1780 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Flory equation-of-state theory, as expressed by Patterson and co-workers, has been applied to two miscible polymer blends: poly(vinyl chloride)/poly(ε-caprolactone) and poly(methyl methacrylate)/poly(vinylidene chloride). For both blends, the variation of the polymer-polymer interaction parameter, χ′23, as a function of composition, is mostly small and can be accounted for by the Flory theory. However, for poly(vinyl chloride)/poly(ε-caprolactone) blends, at high poly(ε-caprolactone content), the large variation of χ′23 as a function of concentration can be explained by a variation of the surface-to-volume ratio of the polymers in the mixture with blend composition. The variations of the surface-to-volume ratios determined in this study agree with those reported in the literature using small-angle x-ray scattering.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260816
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  • 8
    Electronic Resource
    Electronic Resource
    Thermodynamic study of poly(vinyl chloride)/polyester blends by inverse-phase gas chromatography at 120°C (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 2565-2582 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymer/polymer interaction parameters χ′23 have been measured at 120°C as a function of polymer concentration for six different poly(vinyl chloride)/linear aliphatic polyester blends. The technique used is inverse-phase gas chromatography with several molecular probes. The polymers investigated are poly(DL-lactide), poly(ethylene succinate), poly(ethylene adipate), poly(butylene adipate), poly(δ-valerolactone), poly(ε-caprolactone) and poly(hexamethylene sebacate). Probe/polymer interaction parameters χ12 and polymer/polymer interaction parameters χ′23 values are dependent upon the methylene to carbonyl ratio of the polyester, reaching a minimum for a value of 5, this ratio corresponding to poly(ε-caprolactone) blends. Results are interpreted in terms of pairwise interactions between carbonyl, methylene, and [CHCl] groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090241113
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and ring transformation of a new fused as-triazinium salt (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1935-1938 
    Details
    ISSN: 0009-2940
    Keywords: as-Triazinium salt, fused ; Ring transformation ; Solvatochromy, negative ; Zwitterion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Ringtransformation von neuen kondensierten as-Triazinium-SalzenDie Reaktion des 1,2-Diaminopyridinium-Salzes 1 mit dem Furandion 2 ergab ein Pyrido-as-triazinon 3, das zum tricyclischen Furo[2,3-e]pyrido[1,2-b]-as-triazinium-Salz 5 cyclisiert wurde. Die Reaktion von 5 mit Nucleophilen führte zu unterschiedlichen Produkten: mit wäßriger Base entstand das bicyclische Triazinon 4, mit dem Methoxid-Ion und sekundären Aminen wurden die stabilen Zwitter-Ionen 7a, b erhalten, wohingegen Ammoniak und Hydrazine unter Transformation des Furanringes die neuen tricyclischen kondensierten Pyrrole 10, 11 bzw. Pyridazine 13, 14a, b ergaben.
    Notes: The 1,2-Diaminopyridinium salt 1 was treated with furandione 2 to give pyrido-as-triazinone 3, which could be cyclized to the tricyclic furo[2,3-e]pyrido[1,2,-b]-as-triazinium salt 5. Reaction of 5 with nucleophiles resulted in different types of products. Thus, aqueous base afforded bicyclic triazinone 4, methoxide ion or secondary amine led to stable zwitterions 7a, b, whereas ammonia and hydrazines resulted in ring transformation of the furan moiety, and gave new fused tricyclic pyrroles (10, 11) and pyridazines (13, 14), respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221018
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  • 10
    Electronic Resource
    Electronic Resource
    Transfer and treatment of AES, XPS and SIMS data with a network computer station (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 12 (1988), S. 78-82 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Surface and interface data by AES, XPS and SIMS are acquired either by a PDP 11-34, HP 9836U or HP 310 microcomputer using commercially available software (ESAU-Perkin Elmer written in ASSEMBLER) or laboratory-written software (HP BASIC version 3.0/4.0), respectively. These data are then transferred to an independent Apollo computer network station to allow off-line treatment of the experimental data. This paper reports on the standardization of the data output files of the acquired data and their subsequent transfer and reading by an Apollo Network DN 3000 station. The program for the Apollo computer written in C-language allows data treatment as smoothing, differentiation, integration, normalization, curve-fitting and deconvolution on one hand, but also manipulation of data, like calculation of atomic concentration referring to tables based on handbook data. All data can be stored in a format allowing later use for data banks.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740120203
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