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  • Wiley-Blackwell  (20)
  • 1990-1994  (20)
  • 1
    Electronic Resource
    Electronic Resource
    Single-pore model: A simplified diffusion simulation (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 1245-1248 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370815
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  • 2
    Electronic Resource
    Electronic Resource
    Spatiotemporal temperature patterns during hydrogen oxidation on a nickel disk (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 1497-1508 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Spatiotemporal temperature patterns on a polycrystalline nickel disk were recorded using infrared video imaging during atmospheric hydrogen oxidation and characterized by the proper orthogonal decomposition pattern analysis technique. The system was studied at two different residence times, 3.2 s and 6.4 s. At moderate feed temperatures, steady-state multiplicity and rate oscillations were found. Oscillations at a residence time of 6.4 s were periodic and essentially spatially uniform. At a residence time of 3.2 s, however, the surface temperature became nonuniform, and rate oscillations occurred via traveling temperature waves which emanated from “pacemakers” (locally active regions) on the edge of the catalyst. During periodic oscillations, the waves were emitted synchronously from the pacemakers, while during chaotic oscillations, the pacemakers were desynchronized and emitted waves independently of each other. Nonlocal gas-phase coupling between distance surface elements caused spatial desynchronization during rate oscillations.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390909
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  • 3
    Electronic Resource
    Electronic Resource
    Automated routine thermospray mass spectrometry in the analysis of potential drug compounds (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1055-1058 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A System to automate the analysis of routine mass spectrometry samples, using either a thermospray or particle-beam interface, has been developed. This has allowed unattended operation and has freed expert mass spectrometrists to address ‘real’ problems. The system also acts as a filter to the problem-solving service.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071118
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  • 4
    Electronic Resource
    Electronic Resource
    Triton X-100 as a reference compound for ammonia high-resolution chemical ionization mass spectrometry and as a tuning and calibration compound for thermospray (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 1059-1061 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The non-ionic surfactant Triton X-100, 1-(1,1,3,3,-tetramethylbutyl)-4-[poly(1,2-ethanediol)]benzene, has been evaluted as a reference material for positive-ion high-resolution ammonia chemical ionization (CI) mass spectrometry and as a tuning and calibration material for positive-ion thermospray mass spectrometry (TSP). When ammonia is used as the CI reagent gas, Triton-X-100 produces evenly spaced ions that 44 u apart. Triton X-100 cab be volatilized from a solids prove and is routinely used as the reference material for high-resolution measurements. A reference table has been constructed from the theoretical values for the different masses. Triton X-100-Reduced and Triton X-405-Reduced were also evaluated as additional reference com-pounds. As a calibration and tuning compound for TSP, Triton X-100 affords an envelope of ions centred around m/z 600-700 with ions observed above m/z 1000. Triton X-100-Reduced affords a similar envelope although the ions observed are 6 u higher in mass.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071119
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the squalestatins by on-line packed capillary liquid chromatography/dynamic liquid secondary-ion/mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 492-495 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A mixture of four squalestatins was separated and characterized by gradient-packed capillary liquid chroma-tography combined with dynamic liquid secondary-ion mass spectrometry (LSIMS). Thioglycerol/glycerol matrix was added post-column. Negative-ion LSIMS was found to afford spectra typified by strong molecular ions with structurally informative fragments. The new method showed improvements in sensitivity and specificity for this class of compound when compared to existing thermospray methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070618
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of the squalestatins by on-line packed capillary liquid chromatography combined with electrospray mass spectrometry (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 953-956 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A mixture of four squalestatins was separated anil characterized by gradient packed capillary liquid chromatography combined with electrospray collision-induced dissociation mass spectrometry (ESI/CID/MS). Negative-ion ESI was found to afford spectra typified by strong pseudo-molecular ions but providing little structural information. Structural information was obtained using an ion-focusing RF-only octapole lens to provide conditions for CID. The new method showed improvements in sensitivity when compared to existing thermospray and dynamic liquid secondary-ion mass spectrometry methods.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071018
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  • 7
    Electronic Resource
    Electronic Resource
    Melt filtration: The final step in the purification of PVC bottles for recycling (1992)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 14 (1992), S. 135-139 
    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: The final step in the purification of PVC bottles for recycling is melt filtration. However, this common practice increases in complexity when dealing with a clear, thermally sensitive material such as PVC. This paper will explore both conventional and new techniques for melt filtration. This paper also describes various types of contamination found in the form of other polymers and foreign material, as well as experimental data on acceptable levels and processing conditions to purge them from the vinyl melt stream.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730140305
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  • 8
    Electronic Resource
    Electronic Resource
    Low-Pressure chemical vapour deposition of tantalum pentoxide films for ulsi devices using tantalum pentaethoxide as precursor (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 1 (1992), S. 299-308 
    Details
    ISSN: 1057-9257
    Keywords: LPCVD ; Tantalum pentoxide ; High dielectric constant ; ULSI devices ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: A laminar flow low-pressure chemical vapour deposition (LPCVD) system (LAM IntegrityTM) has been used to deposit tantalum pentoxide (Ta2O5) from Ta(OEt)5 films in the presence of oxygen (O2) at 470 °C at a typical deposition rate of 4 nm min-1. Uniformities of 〈1.5% (SD 1σ) over a 150 mm silicon substrate were obtained. The layers were annealed under different conditions. It was discovered that the films did not change their stoichiometry as determined by Rutherford backscattering (RBS). The as-deposited films were amorphous but became crystalline (β-Ta2O5) at temperatures 〉 700 °C. The transmission electron microscopy (TEM) results on crystallisation behaviour were supported by X-ray diffraction data. The electrical properties of the Ta2O5 films have been characterised using MIS (metal/insulator/silicon) capacitor structures. Leakage values of 〈10-6 A cm-2 at 6 MV cm-1 equivalent applied electric field and breakdown strengths of 〉7 MV cm-1 at 1.6 μA were obtained for annealed layers. Compound dielectric constants (native silicon oxide thickness of about 2.5 nm plus Ta2O5 of various thicknesses) between 14 and 〉30 have been measured. The electrical properties reveal the potential use of Ta2O5 as a storage capacitor dielectric in 64 and 256 Mbit DRAM (dynamic random access memory) devices.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860010607
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  • 9
    Electronic Resource
    Electronic Resource
    Uptake and metabolism of pyruvate and glucose by individual sheep preattachment embryos developed in vivo (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 36 (1993), S. 313-319 
    Details
    ISSN: 1040-452X
    Keywords: Carbohydrate metabolism ; Aerobic glycolysis ; Amino acids ; Viability ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The uptake of pyruvate and glucose by individual sheep oocytes and preattachment sheep embryos at each state of development up to the hatching blastocyst was determined using a microfluorescence technique. After an initial increase at fertilization, pyruvate uptake was relatively constant (˜15 pmol/embryo/h) from the zygote through to the morula. Upon blastocyst formation and hatching, there were significant increases in uptake (39 pmol/embryo/h, P 〈 0.001; and 53 pmol/embryo/h, P 〈 0.001, respectively). In contrast to that of pyruvate, glucose uptake was very low (˜1 pmol/embryo/h) up to the time of genome activation (eight- to 16 cell stage), after which there were significant increases in uptake at each successive stage of development. By the hatching blastocyst stage, glucose uptake had reached 54 pmol/embryo/h. The ability of day-7 hatching blastocysts to oxidize pyruvate and glucose was determined indirectly by measuring the production of lactate when either substrate was present as the sole energy source. Unlike the mouse blastocyst, which has a considerable oxidative capacity for both pyruvate and glucose, the day-7 sheep blastocyst showed limited ability to oxidise either substrate. Rather, in the sheep blastocyst, 65% of pyruvate and 98% of glucose taken up could be accounted for as lactate. Such low levels of substrate oxidation appear to be inconsistent with the energy requirements of the proliferating preattachment ruminant blastocyst. The utilization of alternative substrates at the blastocyst, such as amino acids, is proposed. © 1993 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080360305
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of metallic debris on adult bovine articular chondrocyte metabolism in vitro (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 5 (1994), S. 109-115 
    Details
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The purpose of this study was to examine the effects of particles, derived from metals commonly used in joint prostheses, on chondrocyte proliferation, metabolism, and morphology in vitro. Chondrocyte viability was influenced by the type and concentration of metal particle added. Cobalt was toxic to chondrocytes at all particle concentrations (0.83-0.000083%, v/v), whereas the chromium, titanium and titanium-aluminum particles only effected chondrocyte viability at high concentrations. The metabolic response of chondrocytes to particulate debris as assessed by caseinase, collagenase, and hexosaminidase activities were variable at low concentrations but were always reduced at high concentrations (0.83% v/v). Prostaglandin E2 levels in the medium showed a steady increase when particle load increased, except in the medium of chondrocytes exposed to titanium-aluminum. Scanning electron microscopy of chondrocytes exposed to titanium showed ruffled cell borders and frequent membrane blebbings. This was in contrast to chondrocytes exposed to cobalt, where the crenated appearance indicated cell death, and titanium-aluminum, where the cells appeared quiescent. These findings show that metal particles alter chondrocyte viability and metabolism and suggest that particulate debris may influence the integrity and stability of articular cartilage following hemiarthroplasty. © 1994 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jab.770050203
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