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  • 2015-2019  (30)
  • 1995-1999  (86)
  • 1980-1984  (37)
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  • 1
    Electronic Resource
    Electronic Resource
    Powder diffraction using imaging plates at the Australian National Beamline Facility at the Photon Factory : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1351-1353 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel x-ray diffractometer was installed at the Australian National Beamline Facility at the Photon Factory, Japan, in October 1993. One of the major capabilities of the instrument is high speed high resolution powder diffraction using imaging plate detectors. The diffractometer combines a two circle goniometer and a large cassette in which imaging plates can be loaded covering 320° of 2θ. The diffractometer is enclosed in a large vacuum chamber and can be operated in air, vacuum, or helium. Recently, powder data has been obtained from rutile (TiO2) and NBS Si 640b at wavelengths from 0.62 to 1.9 A(ring) using imaging plates, and has been used to characterize the performance of the instrument. The data has been refined using the Rietveld method and R values of under 2% obtained. The resolution of the system varies from a minimum of about 0.04° to around 0.25° at 2θ angles around 160°, which is the equal of most synchrotron based powder diffractometers, and only slightly worse than that obtained using an analyzer crystal and scintillation detector. Using the imaging plates, 160° of data is simultaneously acquired in an exposure of about 10 min, compared to conventional counter diffractometer scans which routinely exceed 10 hours. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145972
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  • 2
    Electronic Resource
    Electronic Resource
    Bioavailability of Iron Produced by the Corrosion of Steel in Apples (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), 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: The bioavailability of iron formed by the corrosion of low-carbon steel (99% Fe) in contact with Red Delicious apples was measured in a rat model using a depletion-repletion experiment. The percentage of ingested iron converted to hemoglobin iron (Conversion Efficiency) was 74, 57, and 56%, respectively, for daily doses of 110, 190, and 285 μg of this iron. (Conversion Efficiency for FeSO4 was 46-50%). When compared with FeSO4= 100, the relative biological value of this iron was found to range from 93–153. Ingestion of one Red Delicious apple that has been exposed to eight large iron nails for 24 hr could provide 10–15 mg iron having good bioavailability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb10134.x
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  • 3
    Electronic Resource
    Electronic Resource
    Structure Refinement of Y2Ru2O7 by Neutron Powder Diffraction (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 790-792 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194013168
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  • 4
    Electronic Resource
    Electronic Resource
    The Performance of the Australian Powder Diffractometer at the Photon Factory, Japan (1995)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 28 (1995), S. 513-517 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Australian scientists have built and installed an X-ray powder diffractometer of an unusual design on the Australian beamline at the Photon Factory synchrotron-radiation facility within the National Laboratory for High Energy Physics (KEK), Tsukuba, Japan. The diffractometer is a Debye–Scherrer camera of 0.573 m radius. The place of the cylindrical film in a conventional camera of this type is taken by image plates. To minimize scattering and absorption by air, the instrument can be evacuated. The instrument is now in operation and has been tested with a specimen of the rutile phase of TiO2. This material has been thoroughly studied previously and it has been demonstrated that time-of-flight neutron powder diffraction, conventional neutron powder diffraction, single-crystal neutron diffraction and single-crystal X-ray diffraction lead to a consistent set of values for the anisotropic thermal parameters and the one positional parameter. The powder specimen of rutile for use at KEK was diluted with gum tragacanth and inserted into a glass capillary of 0.5 mm diameter. The beam from the synchrotron is incident on a silicon (111) channel-cut monochromator. Data were collected to ±165°2θ at wavelengths of 0.62, 1.10, 1.54 and 1.90 Å. The exposure time for each data set was 10 min. The resolution of the instrument agrees with theoretical prediction and is such that the full width at half-maximum of a reflection varies from 0.04° at 20°2θ to 0.2° at 160°2θ for a wavelength of 1.54 Å. The intensity from a 10 min exposure is more than sufficient for Rietveld refinement (Rexp 〈 1%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889894014627
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  • 5
    Electronic Resource
    Electronic Resource
    Structural Studies of Rutile-Type Metal Dioxides (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 373-380 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structures of the four metal dioxides GeO2, SnO2, RuO2 and IrO2 (germanium, tin, ruthenium and iridium dioxides, respectively) have been redetermined by Rietveld refinement from neutron diffraction powder data. The four dioxides all adopt the rutile-type structure, space group P42/mnm (no. 136), with a = 4.4066 (1), 4.7374 (1), 4.4968 (2) and 4.5051 (3), c = 2.8619 (1), 3.1864 (1), 3.1049 (1) and 3.1586 (2) Å, and x = 0.3060 (1), 0.3056 (1), 0.3053 (1) and 0.3077 (3), respectively. These results are compared with those for other metal dioxides that adopt the rutile structure and trends in structural and thermal vibrations for a series of 11 metal dioxides which adopt the rutile-type structure are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768197001468
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  • 6
    Electronic Resource
    Electronic Resource
    Forest-killing diffuse CO 2 emission at Mammoth Mountain as a sign of magmatic unrest (1995)
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 675-678 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIG. 1 Maps of Mammoth Mountain and Long Valley caldera showing four areas (light shading) of anomalous tree-kill (labelled HSL, HSLF, RL and CH12), including two transects (RL and HSL) along which [C02] has been measured at 0.6 m depth (Fig. 2). Analyses of gas sampled at numbered sites are given ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/376675a0
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  • 7
    Electronic Resource
    Electronic Resource
    The use of the relationship matrix to account for genetic drift variance in the analysis of genetic experiments (1983)
    Springer
    Theoretical and applied genetics 66 (1983), S. 217-220 
    Details
    ISSN: 1432-2242
    Keywords: Response to selection ; Genetic drift ; Relationship matrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Selection experiments can provide information on genetic parameters such as realized heritability and response to selection. Often, due to lack of adequate replication, empirical sampling variances of estimated response cannot be computed and therefore use must be made of theoretical formulae. Most of the variance between a conceptually large number of selected lines drawn from the same base population is contributed by genetic drift, which depends on the population structure and can therefore be predicted before the experiment is carried out. The theory of variation of response to selection has been developed mainly by Hill, who produced formulae to adjust the variance of estimators to take account of genetic drift. In this paper, we draw attention to properties of the additive genetic relationship matrix that lead to well established results in population genetics theory. We show how inclusion of the additive genetic relationship matrix among the observations leads to sampling variances of estimators of genetic means that account for the variance due to genetic drift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00251147
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  • 8
    Electronic Resource
    Electronic Resource
    Potential bias in inbreeding depression estimates when using pedigree relationships to assess the degree of homozygosity for loci under selection (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 665-671 
    Details
    ISSN: 1432-2242
    Keywords: Inbreeding ; Finite-locus model ; Selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A potential bias in estimation of inbreeding depression when using pedigree relationships to assess the degree of homozygosity for loci under selection is indicated. A comparison of inbreeding coefficients based on either pedigree or genotypic frequencies indicated that, as a result of selection, the inbreeding coefficient based on pedigree might not correspond with the random drift of allelic frequencies. Apparent differences in average levels of both inbreeding coefficients were obtained depending on the genetic model (additive versus dominance, initial allelic frequencies, heritability) and the selection system assumed (no versus mass selection). In the absence of selection, allelic frequencies within a small population change over generations due to random drift, and the pedigree-based inbreeding coefficient gives a proper assessment of the accompanying probability of increased homozygosity within a ‘replicate’ by indicating the variance of allelic frequencies over replicates. With selection, in addition to random drift, directional change in allelic frequencies is not accounted for by the pedigree-based inbreeding coefficient. This result implies that estimation of inbreeding depression for traits under either direct or indirect selection, estimated by a regression of performance on pedigree-based coefficients, should be carefully interpreted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223295
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  • 9
    Electronic Resource
    Electronic Resource
    Net optical rotation of hydrolyzates of alkali-treated soy flour (1980)
    Springer
    Plant foods for human nutrition 30 (1980), S. 1-11 
    Details
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Net optical rotations of the hydrolyzates of precipitates from alkali-treated soy flour were measured and compared to those of non-alkali-treated controls. Soy flour was exposed to NaOH at pH 9.0 or 12.0 for 10, 30, 60, or 120 min at 60°C. Control samples were treated similarly with distilled water at an unadjusted pH of 6.7. Acid precipitates from the treatment mixtures were hydrolyzed, and the optical rotations of hydrolyzate solutions were measured. Higher pH and longer time of treatment resulted in decreased optical rotation; significant decreases occurred after 60 min or more at pH 9.0, and 10 min or more at pH 12.0. The results are consistent with L- to D-isomerization of amino acids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01112100
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  • 10
    Electronic Resource
    Electronic Resource
    Human urine and/or plasma levels of methionine, methionine sulfoxide, and inorganic sulfate after consumption of a soy isolate: A preliminary study (1980)
    Springer
    Plant foods for human nutrition 30 (1980), S. 155-161 
    Details
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a preliminary study, three human subjects consumed 35 or 70g of a commercially available soy isolate containing 298 or 596 mg of methionine sulfoxide. Methionine sulfoxide appeared in human plasma within one hour after consumption of the isolate. This observation suggests rapid absorption by humans of this oxidized form of methionine. Plasma levels of sulfoxide as determined in one subject returned to zero within 24 hours of consumption of the isolate. Ingested methionine sulfoxide was excreted in the urine in free form in very small quantities relative to intake. These results are consistent with, but of course do not prove, utilization of methionine sulfoxide as a methionine replacement in human subjects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01099053
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