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  • 2005-2009  (408)
  • 1990-1994  (60)
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  • 1
    Electronic Resource
    Electronic Resource
    Transaminase (AST/GOT and ALT/GPT) Activity in Ground Beef as a Means of Determining End-point Temperature (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 57 (1992), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thermal processing conditions [rate of temperature increase, 0.35°C or 3.5°C/min; end-point temperature (EPT), 57.2, 71.1, and 79.4°C; dwell time, 0 and 30 min; and enzyme extraction medium (deionized water, 0.9% saline, and pH 7 buffer)] affected glutamic oxalacetic transaminase (GOT; aspartate aminotransferase, E.C. 2.6.1.1) and glutamic pyruvic transaminase (GPT; alanine aminotransferase; E.C. 2.6.1.2) activity in thermal treated ground beef samples. There was greater loss of GOT activity in samples heat processed at 0.35°C/min than samples heat processed at 3.5°C/min with depletion nearly to zero between 71.1 and 79.4°C. More GOT activity was noted when samples were extracted with 0.9% saline solution. GPT activity was low in all samples and was present after heating to 79.4°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1992.tb08041.x
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  • 2
    Electronic Resource
    Electronic Resource
    End-point Temperature (EPT) Affects N-Acetyl-β-D-Glucosaminidase Activity in Beef, Pork and Turkey (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: End-point tempcraturc (EPT) affected N-acetyl-β-D-glucosaminidase (NAGasc) activity in nonfrozcn and previously frozen cores and ground sampics of beef, pork, turkey breast and ground turkey leg muscle tissue. There was little loss of NAGase activity when heating the products to 40°C; however, as EPT increased from 40–70°C, them was (Pc0.05) loss of activity. At 70°C 90% of activity was lost in beef, 98% in pork, and 93 to 98% in turkey. Inactivation temperature values, IT50, (50% inactivation) were: beef, 59.8°C; pork, 53.4°C; turkey breast, 55.6°C; and turkey leg, 56.6°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb09340.x
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation of ion transport through curved-solenoid macroparticle filters (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1740-1747 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ion transport through curved-solenoid macroparticle filters is investigated using a parabolic potential model of the electric field. Consideration of the ion equations of motion shows that the filter efficiency will increase with the relative radius of curvature of the solenoid and decrease with the relative length of the input region. If the magnetic field is constant in the input region, transport efficiencies of up to 100% are predicted. We argue that the observed effect of axial magnetic field on the angular distribution of ions emitted from the cathode spot can be explained by electric fields changing ion trajectories after emission, rather than a change in spot behavior. Detailed calculations give the energy and angular distributions with which the ions exit the filter. Focusing effects are observed and seen to affect the ion transport−particularly when the ions are not emitted on the filter axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351697
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  • 4
    Electronic Resource
    Electronic Resource
    Structural-modification mechanism for polyimide-doped poly(tetrafluoroethylene) at subthreshold fluences using 248 nm radiation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3049-3051 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-photon excimer laser ablation of neat poly(tetrafluoroethylene) (PTFE) is not observed at emissions in the "quartz'' UV, i.e., from about 190–380 nm. However, it has been successfully demonstrated that, when the fluoropolymer is doped with small quantities of polyimide (PI), ablation in the quartz UV, e.g., at 248 and 308 nm and pulse widths of about 25 ns, is readily achieved. When PI-PTFE blends are exposed to subthreshold fluences, considerable changes in surface topography occur although clearly defined structures, e.g., pits, are not formed. Using photoacoustic infrared spectroscopy to evaluate surface and bulk chemical changes to blends exposed to subthreshold excimer laser fluences, 〈100 mJ/cm2, it is shown that PI (1) is distributed throughout the bulk and resides at the surface and (2) is selectively absorbing the high-energy photons and as a result being preferentially removed from the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357485
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  • 5
    Electronic Resource
    Electronic Resource
    Excimer laser ablation of polyimide-doped poly(tetrafluoroethylene) at 248 and 308 nm (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5972-5980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental data on the 248 and 308 nm wavelength excimer laser ablation at poly(tetrafluoroethylene) doped with polymide (PI) are reported for a range of fluences and dopant concentrations. Threshold fluences were determined and a correlation was obtained between the dopant concentration and the threshold fluence. The threshold fluences and the limiting etch rates at high fluences decreased with increasing dopant concentration, and there is a minimum dopant concentration below which there is no ablation at both of the wavelengths. The side wall taper of the ablated holes increased with increasing dopant concentration. At subthreshold fluences, the polymer surface was modified with selective removal of PI from the polymer blend. The etch rates have been modeled using a two parameter thermal model to describe the etching process. The parameters obtained by fitting the data are qualitatively correlated to the dopant concentration and the measured limiting etch rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355210
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of depletion width of surface barrier detectors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3452-3455 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple experimental method to determine the depletion width of a surface barrier detector is discussed. An electron spectrum of Bi207 taken with a detector having depletion width less than the range of the electrons shows an additional peak. The position of the extra peak enables us to determine the depletion width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141601
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  • 7
    Electronic Resource
    Electronic Resource
    High-resolution line-Q measurements of velocity-selective nonlinear Faraday rotation in Rb vapor (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1026-1028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical feedback from velocity-selective nonlinear Faraday rotation in alkali metal vapors has been shown to be an effective technique for simultaneously stabilizing the frequency and reducing the linewidth of AlxGa1−xAs/GaAs lasers. The ultimate frequency stability of such a laser is limited by the quality factor Q=ν0/Δν of this frequency reference. In this letter we report the measurement of Q=6×106 for optical feedback from velocity-selective nonlinear Faraday rotation in Rb vapor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109823
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  • 8
    Electronic Resource
    Electronic Resource
    Photoconductivity in highly tetrahedral diamondlike amorphous carbon (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 370-372 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A photoconductive effect is observed in tetrahedral amorphous carbon (ta-C) or amorphous diamond films with a high proportion of sp3 bonding and a structure analogous to amorphous silicon. The spectral response is shown to peak at around 750–800 nm and extend into the near UV region. The maximum photoresponse coincides with the optical absorption edge. The quantum efficiency of 300 nm thick films with interdigitated electrodes is over 10% in the wavelength range 450–800 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110046
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  • 9
    Electronic Resource
    Electronic Resource
    Production of laminarinase and alginase by marine bacteria after starvation (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 9 (1992), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1992.tb01770.x
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  • 10
    Electronic Resource
    Electronic Resource
    Lightning-induced intensification of the ionospheric sporadic E layer (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 799-801 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A connection between thunderstorms and the ionosphere has been hypothesized since the mid-1920s. Several mechanisms have been proposed to explain this connection, and evidence from modelling as well as various types of measurements demonstrate that lightning can interact with the lower ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03638
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