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  • Polymer and Materials Science  (10)
  • ASTROPHYSICS  (3)
  • Ankistrodesmus falcatus  (2)
  • 2020-2024
  • 1990-1994  (15)
  • 1970-1974
  • 1994  (15)
Collection
Keywords
Publisher
Years
  • 2020-2024
  • 1990-1994  (15)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    A laboratory-scale system for mass culture of freshwater microalgae in polyethylene bags (1994)
    Springer
    Journal of applied phycology 6 (1994), S. 423-425 
    Details
    ISSN: 1573-5176
    Keywords: Ankistrodesmus falcatus ; Scenedesmus incrassatulus ; Chlorophyceae ; mass production ; microalgae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A laboratory-scale system for mass culture of microalgae in 8-, 20- and 40-L polyethylene bags, was designed. Bags are 16.8 cm diameter and 52 cm (8-L bags), 112 cm (20-L) or 224 cm (40-L) length. The system was tested successfully with two freshwater microalgae,Ankistrodesmus falcatus andScenedesmus incrassatulus, cultured in Bold's Basal medium (prepared with either deionized or tap water). The procedure described is simple, reliable and practical, and enables a very cost-effective production of freshwater microalgae to satisfy any laboratory requirements, and when quantities demanded for special applications can not be met by the standard laboratory culture procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182159
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of food type and concentration on the survival, longevity, and reproduction of Daphnia magna (1994)
    Springer
    Hydrobiologia 287 (1994), S. 207-214 
    Details
    ISSN: 1573-5117
    Keywords: Daphnia magna ; Ankistrodesmus falcatus ; Scenedesmus incrassatulus ; Cladocera ; reproduction ; culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The freshwater microalgae Ankistrodesmus falcatus and Scenedesmus incrassatulus, at three concentrations (6, 12 and 18 mg l−1 t, dry weight), were tested as diets for Daphnia magna cultured in reconstituted hard water, at 19 ± 1 °C. Effects on survival, and reproductive characteristics were evaluated during a complete life-cycle. Test animals fed with the highest food concentration had the lowest survival, longevity, number of clutches, and average inter-brood times, but the total offspring was similar to that obtained with the lowest food concentration, for the same species of alga. Average longevity ranged from 40 to 85 days, with a minimum of 24 and a maximum of 119 days. The average inter-brood time ranged from 4.2 to 5.8 days, the highest values being observed at the lowest food concentration. The average total offspring was maximum for the intermediate concentrations of both algae. The maximum number of clutches ranged from 9 to 23, with the lowest values being observed at the highest food concentration. Even though both microalgae had similar effects on survival and reproduction, and the greatest differences observed were related to food concentration, it seems that S. incrassalulus is a comparatively better food for D. magna. The most suitable food level should be determined prior to carrying out chronic bioassays, and it is also an important factor in cultures for obtaining neonates for toxicological tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010735
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  • 3
    Electronic Resource
    Electronic Resource
    Sub-Tg molecular motions in glassy poly(vinyl chloride). Influence of the nucleophilic substitution (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 871-880 
    Details
    ISSN: 0887-6266
    Keywords: modified poly(vinyl chloride) ; dielectric ; relaxation ; stretched exponential law ; coupling model ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dielectric local molecular motions in the glass transition region of poly(vinyl chloride) (PVC) have been investigated by means of the isothermal depolarization currents technique. Attention is paid to the influence of the modification of the polymer by the substitution of chlorine atoms of PVC chain by the benzenethiolate group. The results are well described by stretched exponential laws. According to the Ngai's coupling model, the coupling between moving units as well as the activation energy responsible for the motions occurring at primitive level have been calculated for each sample at each temperature. All these parameters are noticeably altered by the modification of PVC. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320510
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of some tacticity-depending local chain conformations on the behaviour of poly(vinyl chloride). Changes of glass transition temperature through stereoselective substitution in solution (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 15 (1994), S. 189-196 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1994.030150302
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  • 5
    Electronic Resource
    Electronic Resource
    Poly(ethylene terephthalate)/polyarylate blends: Mixing and interchange reactions in injection molding (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 223-230 
    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: Blends composed of poly(ethylene terephthalate) and a polyarylate have been melt-mixed and molded in a reciprocating screw injection-molding machine for different plasticization times. Interchange reactions between the blend components occur during processing and at a greater level as the plasticization time increases. These reactions led to a progressive homogenization of the blends as well as to a hindered crystallization of PET. The effect of the plasticization time on the mechanical properties of the blends seems to be a consequence of interchange reactions as well as of the degradation of the blends at the highest plasticization times. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510203
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of the chemical modification of phenoxy resin on its miscibility with poly(2-vinyl pyridine)Presented in part at a conference on Polymer Spectroscopy Grasmere, UK, 28 March-1 April 1993. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 393-398 
    Details
    ISSN: 0959-8103
    Keywords: phenoxy resin ; poly(2-vinyl pyridine) ; miscibility ; FTIR ; DSC ; 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 influence of the chemical modification of the hydroxyl groups of phenoxy resin (PH) by benzoate, acetate and methoxy groups on its miscibility with poly(2-vinyl pyridine) (P2VPy) is investigated. Both DSC and FTIR results permit the definition of three distinctive regions: up to 40% modification all 50/50 blends are miscible; between 40 and 55% modification all blends present partial miscibility and at higher than 55% modification the blends are totally immiscible. Specific interactions between the hydroxyl groups of PH and the amine groups of P2VPy are put forward as an explanation for these observations.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330409
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental and theoretical aspects of electrical characteristics of Au/ZnSe/GaAs heterostructures (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 81-88 
    Details
    ISSN: 1057-9257
    Keywords: Semiconductor heterojunctions ; Admittance ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: We present results of a theoretical and experimental study of Au—ZnSe—GaAs heterostructures. In the theoretical part we report the band diagrams, charge densities and static I-V curves obtained from a detailed numerical analysis. In the experimental part we give the results for the static I-V curves and frequency-dependent admittance and impedance at different bias voltages for an Au—ZnSe—GaAs heterostructure with a ZnSe layer of 2.75 μm thickness. An explicit analysis of the data shows that the system can be represented by an equivalent circuit of two RC elements in series corresponding to the ZnSe—GaAs and Au—Se heterojunctions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860030112
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  • 8
    Electronic Resource
    Electronic Resource
    Amperometric glucose biosensor based on a tetrathiafulvalene-mediated epoxy-graphite biocomposite (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 759-763 
    Details
    ISSN: 1040-0397
    Keywords: Glucose biosensor ; Glucose oxidase biocomposite ; Epoxy-graphite composite ; Tetrathiafulvalene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An inexpensive, robust, and easily mechanized amperometric glucose senor based on a biocomposite material has been constructed. The biocomposite is made of graphite, a nonconductive epoxy resin, tetrathiafulvalene (TTF) as a redox mediator, and glucose oxidase (GOD). The enzyme retains its bioactivity on confinement in the rigid epoxy-graphite matrix, with the oxidation current of the reduced mediator serving as the analytical signal (at 150 mV [vs. Ag/AgCl] in a pH 7.00 buffered solution featuring 0.1 M phosphate and 0.1 M KC1). The resulting biosensor shows a linear response in the 0.1 to 2 mM glucose range and produces a steady-state signal within a few seconds (11 seconds for a 95% response). Simple polishing procedures can be used to regenerate a freshly bioactive transducer surface.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060908
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  • 9
    Electronic Resource
    Electronic Resource
    Paramagnetic metal-containing mesogenic polyazomethinesThis work was supported by the CICYT, Spain (under the project nos. MAT93-0104 and MAT90-0748) and the Brite-Euram project BRE2-CT92-0202. (1994)
    Weinheim : Wiley-Blackwell
    Advanced Materials 6 (1994), S. 663-667 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19940060909
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  • 10
    Electronic Resource
    Electronic Resource
    Structural properties of BN thin films obtained by plasma-enhanced chemical vapour deposition (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 809-813 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In this work BN films have been deposited by the plasma-enhanced chemical vapour deposition (PECVD) technique on p-type (100) silicon substrates, using borazine and nitrogen as precursors. X-ray photoelectron spectroscopy, infrared spectroscopy, x-ray diffraction, nuclear reaction analysis and Rutherford backscattering spectroscopy were used to analyse the films. The results of quantitative XPS analysis indicate the formation of a thin surface layer (∼3 nm) of boron oxynitride, BNO0.3, over a bulk of nearly stoichiometric boron nitride, BN1.1. The presence of the hexagonal phase mixed with amorphous boron nitride was identified. Infrared and Rutherford backscattering spectroscopies combined with a liquid etching technique were used to determine the composition and structure across the film thickness. From these measurements we infer that the composition across the film is nearly constant but with a gradual transition from an amorphous structure close to the Si/BN1.1 interface to an hexagonal structure towards the outer layers. Thermal treatments of the boron nitride films up to a temperature of ∼1000°C in a nitrogen atmosphere resulted in a small decrease of both the B/N atomic concentration ratio and the refractive index of the film. The insulating characteristics of the boron nitride for application as an intermetal dielectric were also treated. The electrical conduction results can be interpreted in terms of a Schottky mechanism, which allows us to calculate the high-frequency dielectric constant, εr = 3.2.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740211112
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