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  • 1
    Electronic Resource
    Electronic Resource
    Double inhibition model for degradation of phenol by Pseudomonas putida Q5 (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 60 (1998), S. 560-567 
    Details
    ISSN: 0006-3592
    Keywords: phenol degradation ; Pseudomonas putida ; inhibition model ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A semiempirical model, based on the presence of an inhibitory intermediate metabolite excreted to the broth, was developed to better predict the dynamic responses to shock loadings of Pseudomonas putida Q5 degrading phenol. Compared to the Haldane equation, the new model exhibited better prediction capabilities for a broad range of inlet concentration and dilution rate step changes. The experiments were performed at 10° and 25°C and ranged from stable responses to washouts. The time delays observed experimentally were successfully predicted with the dual-inhibition model and a very good agreement with the observed phenol profile also was found in a pulse experiment. A possible intermediate metabolite was detected by HPLC analyses based on the high correlation shown with the predicted inhibitory intermediate metabolite in the model. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 60: 560-567, 1998.
    Additional Material: 10 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Study of polyethylene photodegradation in formulations with a system of interacting photostabilizers and antioxidants (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 413-424 
    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: The accelerated UV photodegradation process of low-density polyethylene films, formulated with two photostabilizers and two antioxidants, was studied to evaluate the effect of different combinations of UV stabilizers and antioxidants on the overall photodegradation process. An experimental design, consisting of 33 formulations with different additive ratios and a blank, was used to evaluate the performance of the four mixed additives. From each formulation, 200 micron-thick films were produced by the extrusion-blowing process. Samples from these films were submitted to accelerated UV aging, and the polymer degradation was measured by carbonyl group evolution, molecular weight distribution changes, and maximum elongation loss. The effect of the additive combination on the different degradation reactions is discussed qualitatively by using “relative variables” and a triangular diagram. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Control of contact activation on end-point immobilized heparin: The role of antithrombin and the specific antithrombin-binding sequence (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 655-661 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The uptake and activation of FXII from blood plasma was studied in small-diameter polyethylene tubing, surface-modified by end-point immobilization of heparin. Two preparations of heparin were used to modify the contact-activating properties of the plastic tubing: unfractionated, functionally active heparin and low-affinity heparin, lacking the specific antithrombin-binding sequence and virtually devoid of anticoagulant activity. The uptakes of FXII on the two heparin surfaces were similar. No activated FXII could be demonstrated on the unfractionated heparin surface, whereas on the low-affinity heparin surface nearly all FXII underwent spontaneous activation. The suppression of FXII activation on the unfractionated heparin surface was investigated by using plasma depleted of antithrombin, complement C1 esterase inhibitor, or both. The removal of antithrombin resulted in extensive activation of FXII, whereas the depletion of C1 esterase inhibitor had only a minor effect. Experiments with recalcified plasma showed rapid clot formation during exposure to the low-affinity heparin surface. After depletion of antithrombin, but not complement C1 esterase inhibitor, the recalcified plasma clotted in contact with the unfractionated heparin surface as well. We conclude that antithrombin and the antithrombin-binding sequence in the surface-immobilized heparin are essential for the prevention of surface activation of FXII and triggering of the intrinsic coagulation system. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820290513
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of the plasma contact activation system of immobilized heparin: Relation to surface density of functional antithrombin binding sites (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 37 (1997), S. 37-42 
    Details
    ISSN: 0021-9304
    Keywords: heparin surface ; contact activation system ; antithrombin ; factor XII ; systemic heparin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: End-point immobilization of heparin to artificial materials gives rise to a surface that prevents triggering of the plasma contact activation system and, presumably as a result thereof, generally has thrombo-resistant properties. The present investigation was undertaken to determine what density of immobilized heparin molecules expressing functionally intact antithrombin binding sites is required to achieve these blood compatible properties. Six different heparin surfaces were prepared on polyethylene tubing and studied in contact with human plasma. The content of bound heparin was the same on all surfaces while the densities of antithrombin binding sites ranged from 1 to 28 pmol/cm2. The surfaces expressing 4 pmol/cm2 or more of specific anti-thrombin binding sites generated no measurable enzymatic activity in contact with plasma, either on the exposed surfaces or in the plasma phases. Below this level, the degree of activation gradually increased with decreasing densities, and in parallel the thrombo-resistant properties deteriorated. Addition of heparin to the plasma phase reduced the capacity of the heparin surfaces to bind antithrombin, leading to a diminished ability of the surfaces to prevent contact activation. This finding supports the hypothesis that antithrombin is the critical coagulation inhibitor for the suppression of contact activation on end-point immobilized heparin. © 1997 John Wiley & Sons, Inc. J Biomed Mater Res, 37, 37-42, 1997.
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  • 5
    Electronic Resource
    Electronic Resource
    Surface Morphology of a PVC/PMMA Blend Studied by ToF-SIMS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 419-421 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Time-of-flight secondary ion mass spectrometry (ToF-SIMS) studies, utilizing both laterial imaging and shallow depth profiling, of a 50:50 poly(vinyl chloride)/poly(methyl methacrylate) (PVC:PMMA) blend have confirmed the presence of a thin overlayer of PMMA on the phase-separated bulk morphology.
    Additional Material: 3 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Analyzing glycoproteins separated by two-dimensional gel electrophoresis (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 981-988 
    Details
    ISSN: 0173-0835
    Keywords: Glycoprotein ; Two-dimensional polyacrylamide gel electrophoresis ; α1-Antitrypsin ; α2-HS Glycoprotein ; Protein isoforms ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Two-dimensional (2-D) electrophoresis is the preferred method for separating the glycoforms of proteins. The isoforms usually present as ‘trains’ of spots in the first dimension and may also differ in molecular weight. The primary goal for analyzing the carbohydrate content of glycoprotein spots is to understand the ‘rules’ which govern the migration of glycoproteins in 2-D electrophoresis. These rules can then be used to produce predictive vectors to interpret changes in glycosylation patterns. Techniques for the analysis of oligosaccharides released from glycoproteins which have been electroblotted to PVDF membrane after one-dimensional (1-D) and 2-D preparative gel electrophoresis are described. The oligosaccharides are removed enzymatically (PNGase F of N-linked oligosaccharides) or chemically (β-elimination of O-linked oligosaccharides) and separated by high performance anion exchange chromatography (HPAEC-PAD) and identified by electrospray ionization mass spectrometry (ESI-MS) or analyzed directly by ESI-MS. After enzymic removal of the N-linked oligosaccharides the protein spots can be further analyzed by Edman sequence tagging for identification and quantitation of the protein and by acid hydrolysis for monosaccharide analysis of the O-linked oligosaccharides. These approaches have been proved on 1-D PAGE electroblotted bovine fetuin and human glycophorin A and then used to analyze two abundant proteins which separate as glycoforms on 2-D PAGE preparative narrow range (pH 4.5-5.5) blots of human plasma: α2-HS glycoprotein (human fetuin) and α1-antitrypsin (α1-protease inhibitor). It is apparent that both the macroheterogeneity (site occupation) and microheterogeneity (diversity of structures) of the glycosylation contribute to the separation of protein isoforms in 2-D PAGE.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150190613
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of the lubricant properties of candelilla wax in unplasticized PVC/wax systemsPart of this work integrates the Masters in Polymer Science and Technology Thesis of V. Valverde-Herrera, at U. A. de C. (1995). (1995)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 1 (1995), S. 162-169 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper reports on the evaluation of a natural product, candelilla wax, as a possible lubricant for unplasticized PVC formulations stabilized with lead or barium/cadmium chemicals. The lubricant effect of two types of wax (commercial grade and purified by solvent extraction) was evaluated by torque and extrusion rheometry and by differential scanning calorimetry. Commercial lubricants (Loxiol) were used for comparison. The results show that candelilla wax may be used as a lubricant (mainly of the external type) for unplasticized PVC; however, care must be taken when designing formulations to avoid over-lubrication, specially when lead-based thermal stabilizers are used.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730010310
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