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  • 1
    Electronic Resource
    Electronic Resource
    High-resistivity regions in n-type InGaAsP produced by 4He+ ion bombardment at 80 and 300 K (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2126-2128 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of high-resistivity regions in Si-doped (n=1×1018 cm−3) lattice-matched In0.75Ga0.25As0.54P0.46 on InP by helium ion bombardment at 300 and 80 K has been investigated as a function of ion dose (1×1012–1×1016 cm−2) and subsequent annealing temperature (70–650 °C) by sheet resistance and Hall effect measurements as a function of temperature. Irradiations at 300 K are found to induce an increase in the resistivity by a factor of up to 3×105 relative to that of the unimplanted material. Materials bombarded at 80 K with doses higher than 7×1014 cm−2 exhibit a further increase in the sheet resistance and higher stability upon subsequent annealing. Rutherford backscattering channeling results suggest that this behavior is related to the creation of a highly polycrystalline or amorphous region in the InGaAsP layer which occurs for irradiations performed at 80 K, but not at 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110561
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  • 2
    Electronic Resource
    Electronic Resource
    Dislocation relaxation in InAsyP1−y films deposited onto (001) InP by gas-source molecular beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3194-3196 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The strain relaxation of InAsyP1−y layers grown on (001) InP substrates by gas-source molecular beam epitaxy was examined using transmission electron microscopy (TEM) and cathodoluminescence (CL) imaging. InAsyP1−y films with a thickness of 190 A(ring) were prepared, systematically varying the As content from y=0.30 and 0.77, corresponding to a lattice mismatch between 0.97% and 2.5%. Relaxation was anisotropic, with 60° misfit dislocations lying predominantly along [11¯0], with a much lower density of dislocations along [110]. For y(approximately-greater-than)0.48, CL and plan-view TEM observations show slip traces which make angles of about ±40° with the [11¯0] direction. These slip traces correspond to pure-screw dislocation segments (gliding on {111}) cross slipping to glide on planes approximately parallel to {011}.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110196
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  • 3
    Electronic Resource
    Electronic Resource
    Limits on Lyman-alpha Luminous Protogalaxies (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 688 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb43926.x
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation of 7-thia-nido-undecaborate(2-) by silver ion to give arylthiaboranes (1976)
    s.l. : American Chemical Society
    Inorganic chemistry 15 (1976), S. 2948-2950 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50165a086
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  • 5
    Electronic Resource
    Electronic Resource
    LOSSES IN AVAILABLE LYSINE DURING THERMAL PROCESSING OF SOY PROTEIN MODEL SYSTEMS (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 41 (1976), 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: This study was conducted in order to develop a mathematical model for predicting lysine losses during processing of soy products. Model systems used in this study consisted of micro crystalline cellulose, glucose, sucrose, potato starch and soy protein. System composition, water activity, pH and time and temperature of heating were varied and available lysine was monitored by the fluoro-2,4-dinitro benzene method of Carpenter. In the first set of experiments, statistical analysis of the data obtained resulted in an equation which shows the effects of the variables used on available lysine retention: Fraction available lysine remaining = 0.58 + 0.047 pH - 0.093 glucose - 0.059 temperature —0.0068 time + 0.031 (water activity)2+ 0.025 aw sucrose + 0.033 sucrose starch. These data were collected at heating times well in excess of that required to destroy all reducing sugars present. Heating times were reduced in the second experiments such that kinetic data could be obtained. The average Ea was 28,500 calories/mole°K and the average reference reaction rate at 100°C (K100) was 0.036 mg lysine/min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1976.tb00730_41_4.x
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  • 6
    Electronic Resource
    Electronic Resource
    Mitochondrial DNA variation in Atlantic salmon, Salmo, salar L., populations (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Mitochondrial DNA (mtDNA) variation was examined in 209 Atlantic salmon from two river systems, the R. Itchen in Hampshire (Southern England) and the R. Conwy (North Wales). Within each system, five spawning sites were sampled. Four enzymes (AVA II, HAE III, HINF I and MBO I) revealed restriction fragment polymorphisms that were informative. Ten clonal lines were observed. These clones were differentially distributed between the two river systems and single clonal types were found to predominate at several spawning sites. MBO I variants were found in salmon from the R. Itchen but not the R. Conwy. A significant heterogeneity in frequency distribution of clonal lines between parr and smolt assemblages of the same year class within the R. Itchen was detected. This heterogeneity suggests that differences in survival or migratory behaviour may be identified by changes in mtDNA clonal frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00303.x
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  • 7
    Electronic Resource
    Electronic Resource
    Temporal and spatial variation in mercury concentrations in some albatrosses and petrels from the sub-Antarctic (1993)
    Springer
    Polar biology 13 (1993), S. 239-244 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mercury concentrations in albatrosses and some other large procellariiforms are very much higher than found in other groups of seabirds. Analysis of mercury concentrations in feather samples collected prior to 1950 and after this date showed slight, but significant, increases in three out of ten sub-Antarctic procellariiform species. The lack of widespread and pronounced increases in mercury concentrations in procellariiforms between these periods may indicate that industrial and agricultural emissions of mercury in the southern hemisphere have been relatively minor and the high concentrations are predominantly due to natural processes. Mercury concentrations were relatively consistent between body feathers of individuals, and showed no variation related to adult age (in years). Within species, mercury concentrations tended to be highest in New Zealand populations and lowest in Falkland Island and South Georgia populations. Mercury concentrations also varied among species, but not in a way that could be related to diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238759
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  • 8
    Electronic Resource
    Electronic Resource
    Densification of zirconia-containing sialon composites by Sm2O3 (1993)
    Springer
    Journal of materials science 28 (1993), S. 3097-3102 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Sm2O3 was used as an additive for ZrO2/O′-sialon composites and showed remarkably good densification behaviour on sintering. Sm2O3 appeared to behave as a densification rather than a stabilization additive and the low eutectic temperature in this system facilitated densification before zircon dissociation. An important advantage is that the final sintering temperature is then determined by the minimum temperature at which full conversion from α-Si3N4 to O′-sialon can be achieved. At this temperature (1500–1550 °C), grain growth of zirconia is minimal, and this allows control of small grain size for the zirconia particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354716
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic interrelationships of proteolyticClostridium botulinum types A, B, and F and other members of theClostridium botulinum complex as revealed by small-subunit rRNA gene sequences (1993)
    Springer
    Antonie van Leeuwenhoek 64 (1993), S. 273-283 
    Details
    ISSN: 1572-9699
    Keywords: 16S rRNA ; Clostridium botulinum ; phylogeny ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phylogenetic interrelationships of members of theClostridium botulinum complex of species was investigated by direct sequencing of their 16S rRNA genes. Comparative analysis of the 16S rRNA sequences demonstrated the presence of four phylogenetically distinct lineages corresponding to: i) proteolyticC. botulinum types A, B, and F, andC. sporogenes, ii) saccharolytic types B, E and F, iii) types C and D andC. novyi type A, and iv) type G andC. subterminale. The phylogenetic groupings obtained from the 16S rRNA were in complete agreement with the four divisions recognised within the ‘species complex’ on the basis of phenotypic criteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00873087
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  • 10
    Electronic Resource
    Electronic Resource
    The transparency of oxynitride glasses (1993)
    Springer
    Journal of materials science 28 (1993), S. 506-512 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Nitrogen-containing glasses in the Mg-Si-Al-O-N and Y-Si-Al-O-N systems were prepared at 1700–1750 °C under 1–5 atm pressure of nitrogen and their microstructures subsequently examined by optical and electron microscopy. The main reason for the diminished transparency of oxynitride glasses was found to be the formation of Fe-Si alloy-based precipitates which, on cooling, decompose into grains of FeSi2 and a smaller number of grains of silicon. These “precipitates” also contain other metals (chromium, nickel, etc.) and act as heterogeneous nucleation centres for decomposition of the melt. It is therefore suggested that the best way of producing transparent nitrogen glasses is to use starting materials of extremely high purity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357831
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