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  • 1
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 53 (1988), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A protein concentrate (NPC), obtained by alkali extraction of navy beans, was used as a model medium for microbial growth. Only three among eight bacterial cultures (Pediococcus spp, Pseudomonas spp and Streptococcus spp) grew better on mediums with NPC than on the control nutrient broth. Retail ground beef with and without 5%, 10%, and 15% NPC was wrapped with plastic film and stored up to 6 days at 4°C. Aerobic plate count, psychrophiles, coliforms, yeasts and molds were determined at 0, 3, and 6 days. All levels of NPC added to ground beef had a significant influence on aerobic plate count and coliforms. Growth of psychrophiles and yeasts and molds was not affected by NPC. Lactobacillus spp was a dominant part of the microflora of all samples.
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Trends in Food Science and Technology 5 (1994), S. 127-128 
    ISSN: 0924-2244
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Meat Science 24 (1988), S. 189-199 
    ISSN: 0309-1740
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3327-3329 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermochromic VO2−xFx thin films were prepared by reactive rf magnetron sputtering followed by annealing post-treatment. Electrical and optical properties were measured as a function of temperature. The transmittance and reflectance were essentially wavelength independent at 65 °C, i.e., at the metal-insulator transition.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 4-6 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of VOxFy were made by rf magnetron sputtering of V in Ar+O2+CF4. They were analyzed by Rutherford backscattering spectrometry and transmission electron microscopy. Optical and electrical properties changed within narrow temperature ranges. These results resemble those of thermochromic VO2, although VOxFy has significantly enhanced transmittance, lowered conductance, and marginally depressed switching temperature.
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10526-10538 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the results of measurements of the cross section as a function of wavelength (351, 248, and 193 nm) for photoinitiated dissociative electron attachment to three normal alkyl bromides [CH3(CH2)n−1Br, n=1, 2, and 3] physisorbed on GaAs(110). Upon UV exposure, the molecules undergo C–Br bond cleavage due to a substrate-mediated electron-transfer process. The cross sections for all three molecules increase monotonically with decreasing wavelength. Our results suggest a ∼1 eV higher threshold for dissociation of ethyl and propyl bromide than for methyl bromide. A simple model of the electron-transfer process is employed to estimate the peak per-electron cross section for dissociative attachment in the monolayer. We find that the cross sections for the physisorbed molecules are approximately five times smaller than those for gas-phase molecules, due to a reduction in the lifetime of the molecular anion in the vicinity of the surface. In addition, we also find an increase in cross section with chain length very similar to that observed in the gas phase; the gas-phase behavior has been explained by an increase in the anion lifetime with chain length. Our results suggest that while quenching of the molecular anion at the surface is important, it does not eliminate the progression of anion lifetime with chain length. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 5054-5059 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The kinetics of irreversible dimer–dimer surface reactions of the type A2+B2→2AB with desorption of dimer B2 has been investigated by means of Monte Carlo simulation. For a desorption probability (P) of B2 equal to zero, a single discontinuous transition separating an A+vacancies saturated surface from a B+vacancies saturated surface is obtained at yB2=0.5 (yB2 is the partial pressure of B2 in the gas phase). With the increase in P, a steady reactive state which is separated from the poisoned states by two continuous transitions is obtained for this system. The position of the transition points depends upon the value of P. For P equal to one, a single continuous transition at yB2=0.538 separates a poisoned state from a steady reactive state. The window width, which defines the steady reactive state, shows an exponential behavior with P. Preliminary studies have been under taken to determine the universality class of the system for different P values. © 1998 American Institute of Physics.
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  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8045-8057 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The wavelength dependence of photoinduced dissociation of CH3Br via dissociative electron attachment (DEA) of "hot" electrons for one monolayer CH3Br adsorbed on GaAs(110) has been measured. The cross section for dissociation is found to decrease monotonically by two orders of magnitude as the incident wavelength is varied from 308 to 550 nm. There is an apparent threshold near 490 nm (2.5 eV), well below the gas phase photodissociation threshold near 250 nm (5.0 eV), but in good agreement with a simple estimate based on expected values for the decrease in the photoemission threshold and the lowering of the molecular affinity level upon adsorption of CH3Br on a semiconductor surface. The observed threshold is found to move to higher energy as dissociation of the monolayer proceeds. Based on the work of Hasselbrink and co-workers [F. Weik, A. de Meijere, and E. Hasselbrink, J. Chem. Phys. 99, 682 (1993)], a simple theoretical model is developed which considers the tunneling of hot electrons through the interfacial barrier between the physisorbed CH3Br and the GaAs. The results of our theoretical model in conjunction with those of earlier ab initio calculations [S. Black, R. Friesner, P. H. Lu, and R. M. Osgood, Jr., Surf. Sci. 382, 154 (1997)] suggest that the adsorbate affinity level is centered at ∼0.6 eV above the (adsorbate- modified) vacuum level of the substrate. This value corresponds to a ∼1.8 eV stabilization of the negative ion resonance upon adsorption. © 1998 American Institute of Physics.
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 8890-8895 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of the subsurface in monomer–dimer (CO-O2) surface reaction is studied by Monte Carlo simulation. The presence of the subsurface adds some extra reaction steps to the usual three. It is shown that the presence of the subsurface favours the enhancement of the steady reactive state by reducing appreciably the poisoning of the surface by the adsorbed dimer atoms. Under certain conditions the usual second order phase transition in CO−O2 reaction can be eliminated. The role played by the two way diffusion of adsorbed dimer atoms between surface and subsurface in the variation of steady reactive state is clearly illustrated. © 1997 American Institute of Physics.
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