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  • 1
    Electronic Resource
    Electronic Resource
    The light curved in the CM field (1992)
    Springer
    Astrophysics and space science 197 (1992), S. 269-281 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we introduce the CM field in Sections 2 and 3 based on the paper by Wang and Peng (1985), and calculate the light curved in the CM field in Section 4. The result shows thatP makes ΔφCM larger than ΔφC at $$\theta \in (\cos ^{ - 1} \tfrac{1}{3},\pi - \cos ^{ - 1} \tfrac{1}{3})$$ , and smaller at $$\theta \in (\theta ,\cos ^{ - 1} \tfrac{1}{3}) \cup (\pi - \cos ^{ - 3} \tfrac{1}{3},\pi )$$ . Under a special circumstance which source, CM lens, and observer are in the same line, if we get Δφ| 0=0 , $$\Delta \phi |_{\theta = \cos ^{ - 1} } 1/3$$ and Δφ| θ=π/2 , we can determine theP(M) andQ(M) of the CM lens,M is the mass of the CM lens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645740
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  • 2
    Electronic Resource
    Electronic Resource
    The exact solution of Einstein's disc (1992)
    Springer
    Astrophysics and space science 192 (1992), S. 325-328 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this Letter, Einstein's equations of gravitational field have been used to calculate the metric of Einstein's disc. The known result has been obtained, but its physical significance is made very clear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684491
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and characterization of two HEMA/PVA copolymers: Poly[HEMA-co-(PVA-AA)] and poly[HEMA-co-(PVA-MA)] (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 1967-1972 
    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 copolymers of poly[HEMA-co-(PVA-AA)] and poly[HEMA-co-(PVA-MA)] were synthesized and characterized. The presence of PVA-AA in the copolymer increased the mechanical strength but decreased the water content of the material. The presence of PVA-MA, on the other hand, caused a decrease of mechanical strength and an increase of water content. The ionization of acidic group in poly[HEMA-co-(PVA-MA)] resulted in the swelling of the copolymer, and the swelling extent was controlled by the change of pH. Both copolymers have great potential in biomedical application. © 1992 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070461109
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  • 4
    Electronic Resource
    Electronic Resource
    Changes of lipase-catalyzed lipolytic rates in a batch reactor (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 39 (1992), S. 1128-1132 
    Details
    ISSN: 0006-3592
    Keywords: lipolytic rates ; hydrolysis ; tributyrin ; Candida rugosa ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A dramatic change of the reaction rate was observed for the lipase-catalyzed hyrolysis of tributyrin in a batch reactor. Immediately after the addition of the enzyme, the lipolysis rate increased continuously until a maximal reaction rate was reached. The duration of the induction was mainly controlled by the bulk enzyme concentration and the reactor stirring speed. The reaction rate dropped sharply after reaching its maximal value. The lipolysis decayed at a rate of about 0.012 min-1, and was not affected by changes of the stirring speed. This decay was attributed to the fast deactivation of the surface-adsorbed lipase, and possibly to the extremely slow desorption of the inactivated species. For reaction time longer than 120 minutes, the lipolysis decreased at a much slower rate. Several mechanisms for the decay of the lipolysis rate were discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260391108
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  • 5
    Electronic Resource
    Electronic Resource
    Urea sensor with single poly(propylene) membrane (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 446-449 
    Details
    ISSN: 0006-3592
    Keywords: urea sensor ; plasma reaction ; poly(propylene) membrane ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Urease was immobilized on the plasma-aminated surface of a hyfrophobic poly(propylene) (PP) membrane. This membrane, with urease matrix on one side while maintaining its original hydrophobic property on the other, was used to construct the urea sensor. The new urea sensors had response sensitivities ranged from 19 mV/decade to 30 mV/decade depending on the conditions of the plasma reaction. The enzyme electrode using single membrane gave a shorter response time as compared to the corresponding conventional electrode employing two seperate PP membranes. The sensitivity of the enzyme electrode increased with increasing buffer pH and reached a maximal level (40 mV/decade) at pH 7.6. The response sensitivity of the electrode was not affected by the change of buffer strength. Deamination of the plasma-modified hydrophobic PP membrane did not occur in aqueous environment judging from the stability of the urea electrode up to 12 days of operation. © 1992 John Wiley & Sons. Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260400315
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and application of poly(vinylamine)/alginate microcapsules to culturing of a mouse erythroleukemia cell line (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 1115-1118 
    Details
    ISSN: 0006-3592
    Keywords: microencapsulation ; poly(vinylamine) ; cell culture ; mechanical strength ; erythropoietin ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Poly(vinylamine) was synthesized and used to replace poly-L-lysine in forming microcapsule with alginate. Test results indicated that capsules with good mechanical strength and permeability could be obtained under the controlled treatment conditions of poly(vinylamine) and alginate. Application of the current microcapsular system to cell culture was demonstrated by the usage of erythropoietin- (EPO-) producing IW32 mouse erythroleukemia cells. The encapsulated IW32 cells grew to a density of 8 × 107 cells/mL, two times that found in the corresponding poly-L-lysine/alginate capsules. The EPO accumulation inside the microcapsule with the current encapsulation system was also higher. A concentration of 7.3 U/mL was attained as compared to 4.3 U/mL in the poly-L-lysine/alginate microcapsule. © 1992 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260400916
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  • 7
    Electronic Resource
    Electronic Resource
    Microencapsulation with poly(vinyl amine) and alginate (1992)
    Springer
    Biotechnology techniques 6 (1992), S. 185-188 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Poly(vinyl amine) and alginate were used as the materials for microencapsulation. IW32 (a murine erythroleukemia cell line) cells were cultured within the capsules to a density of 8×107 cells/ml, 40 times that obtained in the free-cell culture. Erythropoietin accumulated in the microcapsule to a concentration of 7.0 U/ml, about three times that in the extra-capsular medium and 14 times the concentration found in the medium of free-cell culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02438830
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