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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 48 (1995), S. 520-528 
    ISSN: 0006-3592
    Keywords: human growth hormone ; animal cell culture ; purification ; serum ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Human growth hormone (hGH) is a polypeptide with 191 amino acids and a molecular mass of 22 kilodaltons. With the aid of computer molecular simulation, an hGH analog was created by altering an hGH gene to reflect the change of one amino acid (glycine [G] 120 to arginine [R]) within the third α-helix of the hGH molecule. This hGH analog, named hGHG120R, was found to be an hGH antagonist. It may have important implications in treating human conditions in which hGH levels are abnormally high, as found in type I diabetics. Several hundred milligrams of purified hGHG120R were needed to determine the biological activity of the antagonist in animal models. A multistep downstream process was developed to purify hGHG120R from cultured mouse L cells transfected with the hGHG120R gene. The process consisted of cell clarification, salt precipitation, membrane ultrafiltration, reversed phase high performance liquid chromatography, phase separation, and lyophiliation. This work discusses the rationale for the design of the process and experimental results on the purification of hGHG120R using the process. © 1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 208 (1993), S. 65-77 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Umsetzung von 2,2′,6,6′-Tetrabrombisphenol A (TBBPA) mit Phosgen in einer mit Trialkylamin katalysierten Grenzflächenpolykondensation liefert nur Polymere mit niedrigem Molekulargewicht. Die geringe Reaktivität von TBBPA wird auf dessen sterisch anspruchsvolle Struktur und den elektronenziehenden Charakter der o-Bromsubstituenten zurückgeführt. Aus der Bildung von Carbamaten bei der Reaktion einer Modellverbindung (2,4,6-Tribromophenylchlorformat, TBPC) mit Trialkylaminen geht hervor, daß durch Zerfall des Katalysator-TBPC-Komplexes die Polymerisation abgebrochen wird. Das Carbamat wird durch Zersetzung des Acylammoniumsalzes gebildet, wobei eine nucleophile Substitution durch das Chloridion an dem an das positiv geladene Stickstoffatom gebundenen Kohlenstoffatom stattfindet.
    Notes: 2,2′,6,6′-Tetrabromobisphenol-A (TBBPA), a sterically hindered bisphenol, is known to give only low-molecular-weight polymers using the interfacial phosgenation process. The low reactivity is attributed to the bulkiness and electron-withdrawing character of bromine substituents at the ortho positions. From the formation of carbamate products in model compound (2,4,6-tribromophenyl chloroformate, TBPC) reactions with trialkylamines, the trialkylamine catalyst was found to act as a terminator by the degradation of the chloroformate-trialkylamine complex. The generation of carbamate occurs through the decomposition of the acyl ammonium salt proceeding via nucleophilic displacement by Cl- at the carbon attached to the positive nitrogen center. The relative catalytic abilities of trialkylamines and pyridine derivatives were determined in the homogeneous (dichloromethane) and interfacial (dichloromethane/water) systems. From the results of model reactions with TBPC and sodium tribromophenolate, 4-dimethylaminopyridine (DMAP) was found to be the best catalyst.
    Additional Material: 7 Ill.
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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Schizophyllan exists in aqueous solution as a triple helix, which is intact at room temperature. Its aqueous solution forms some ordered structure at low temperatures but undergoes a sharp transition to a disordered structure as the temperature is raised. The transition temperature Tc is about 7 and 18°C for H2O and D2O solutions, respectively. This transition was followed by time-domain reflectometry to investigate dynamic aspects of the transition. In addition to a major peak around 10 GHz, the dielectric dispersion curve of a 20 wt % schizophyllan in D2O exhibited a small peak around 100 MHz below Tc and around 10 MHz above Tc. The major peak is due to bulk water, whereas the 100 MHz peak is assigned to “bound” or “structured” water, and that around 10 MHz to side-chain glucose residues. However, unlike usual bound water reported for biopolymer solutions, this “structured” water disappears abruptly when the temperature becomes close to Tc without accompanying a conformational transition of the main chain. The above assignment is consistent with the structure of the ordered phase derived from previous static data that it consists of side-chain glucose residues along with nearby water molecules surrounding the helix core that are interacting with each other loosely through hydrogen bonds, and spreads radially only a layer of one or two water molecules but a long distance along the helix axis. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 73 (1990), S. 213-220 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Solutions of blockcopolymers (POE-b-PI-b-POE) in fluids of interacting aqueous nanodroplets (W/O microemulsions) are studied. The interaction strength between the (pseudo) two components is measured by the shift of the percolation temperature relative to that of the pure microemulsion. A quantitative measure of the interaction, the differential heat of solution, is thermodynamically related to the slopes of the equilibrium temperature of the system with varying monomeric nanodroplet concentration and the experimental percolation line in the presence of copolymer.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 581-584 
    ISSN: 0009-2940
    Keywords: Vinylferrocene ; Pd-catalyzed twofold and fourfold couplings ; Electron-donor-acceptor[2.2]paracyclophanes ; Charge transfer ; Cyclic voltammetry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As potential nonlinear optical material. 12-nitro-4,7-bis(2-ferrocenylvinyl)[2.2]paracyclophane (1) and 12-nitro-4,5,7,8-tetrakis(2-ferrocenylvinyl)[2.2]paracyclophane(2) have been synthesized by pd-catalyzed coupling reactions of vinylferrocene with the precursor cyclophanes 9 and 13, respectively. The absorption and electrochemical properties of 1 and 2 are also described.
    Additional Material: 1 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 1372-1378 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Polymer coatings are widely used to protect glass from indentation damage. A model for the strength degradation that occurs when a sharp indenter penetrates through the coating is developed by accounting for the indentation load shared by the coating and substrate. This model accounts for the additional load supported by the coating due to the pile-up of coating material underneath the indenter. The model predicts the strength degradation as a function of indentation load, coating and substrate hardnesses, and coating thickness. Comparison of the model to experimental data for a wide range of polymer coatings (two epoxies, epoxy acrylate, and urethane acrylate) on soda-lime glass substrates shows good agreement.
    Additional Material: 10 Ill.
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  • 7
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers of N-substituted methacrylamide (1a, b), new biomaterials, were synthesized to be used as encapsulating membranes of carbon kidney. In order to obtain a copolymer with a suitable hydrophilic property, the aminolysis of styrene-methyl methacrylate (St-MMA) copolymer with N-(2-hydroxyethyl)ethylenediamine was carried out under various conditions. The occurrence of aminolysis was confirmed by elemental analysis, IR and 1H NMR spectra. It was shown that a copolymer of N-substituted methacrylamide with a predictable degree of hydrophilicity can be obtained by controlling the composition ratio of the St-MMA copolymer and the degree of aminolysis of the copolymer. Hemoperfusion experiments with a living animal (dog), using a minicolumn with several types of microspheric activated carbon encapsulated with various copolymers, showed that copolymers with suitable hydrophilicity and hydrophobicity or with proper structure have a good blood compatibility. Studies with creatinine, uric acid and vitamin B12 showed that microspheric activated carbon, encapsulated with N-substituted methacrylamide copolymers of proper hydrophilicity and structure, has a good penetration property, and that detaching of activated carbon particles is effectively prevented.
    Additional Material: 3 Ill.
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  • 8
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2-Hydroxyethyl methacrylate was polymerized in presence of 2-mercaptoethylamine to an amino-semitelechelic poly(2-hydroxyethyl methacrylate). Poly(tetramethylene glycol) was reacted with 4,4′-methylenediphenyl diisocyanate to form a diisocyanato-telechelic poly(tetramethylene glycol). Both prepolymers were linked together by coupling reaction between —NH2 and —NCO groups in DMF at 0°C, resulting in an ABA type block copolymer. The structure of the product was examined by IR, NMR and SEM. It was found that the block copolymer possesses a microphase separated structure. Animal experiments showed that this ABA type block copolymer has good blood compatibility and excellent permeability for uric poisonous substances.
    Additional Material: 4 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 2997-3007 
    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: The curing reaction of a thermally curable epoxy system containing diphenyliodonium hexafluoroarsenate was investigated by using the dynamic and isothermal techniques of differential scanning calorimetry (DSC). It was shown that the curing involved two consecutive reactions. The heat of the total curing reaction and overall kinetic parameters for the two reactions were obtained.
    Additional Material: 8 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 1625-1632 
    ISSN: 0887-624X
    Keywords: α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl-5-fluorouracil (MMTFU) ; poly(MMTFU-co-AA) ; poly(MMTFU-co-VAc) ; photopolymerization ; average molecular weight ; in vitro cytotoxicity ; in vivo antitumor activity ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The new monomer, α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl-5-fluorouracil (MMTFU), was synthesized from 5-fluorouracil (5-FU) and α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl chloride (MMTC). Poly(α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl-5-fluorouracil) [poly(MMTFU)], poly(α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl-5-fluorouracil-co-acrylicco-AA), and poly(α-methoxy-3,6-endo-methylene-1,2,3,6-tetrahydrophthaloyl-5-fluorouracil-co-vinyl acetate) [poly(MMTFU-co-VAc)] were synthesized by photopolymerizations using 2,2-dimethoxy-2-phenylacetophenone (DMP) as the photoinitiator. The synthesized MMTFU and the polymers were identified by FT-IR, 1H-NMR, and 13C-NMR spectroscopies. The contents of MMTFU in poly(MMTFU-co-AA) and poly(MMTFU-co-VAc) determined by elemental analysis were 63 and 57 mol %, respectively. The number average molecular weights and polydispersity indices of synthesized polymers determined with GPC were in range of 7,700-19,100 and 1.6-2.7. The in vitro cytotoxicities of samples were evaluated with mouse mammary carcinoma (FM3A), mouse leukemia (P388), and human histiocytic lymphoma (U937) as cancer cell lines and mouse liver cells (AC2F) as a normal cell line. The cytotoxicities of 5-FU and synthesized samples against cancer cell lines increased in following orders: 5-FU 〉 MMTFU 〉 poly(MMTFU) 〉 poly(MMTFU-co-AA) 〉 poly(MMTFU-co-VAc). The in vivo antitumor activities of the synthesized samples against mice bearing the sarcoma 180 tumor cell line were evaluated. The in vivo antitumor activities of the polymers were greater than that of 5-FU at a dose of 80 mg/kg. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1625-1632, 1998
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