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  • 1
    Electronic Resource
    Electronic Resource
    WATER-SOLUBLE VITAMIN CONTENT OF SOME CALIFORNIA WINES (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), 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 thiamine, riboflavin, vitamin B6, vitamin B12, niacin, biotin, fo- late, pantothenate and vitamin C levels in several American wines were determined. Five types of white wine and eight types of red wine were examined. The levels of the eight B-vitamins were higher in the red wines than in the white. Nutritionally significant levels of riboflavin, vitamin B6 and niacin were found in the red wines. Folate levels of the wines were lower than reported in earlier studies. Statistical evaluation of the thiamine data indicated the presence of inhibition in these as- says.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1978.tb15235.x
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  • 2
    Electronic Resource
    Electronic Resource
    COMPARISON OF PROTOZOAN AND CONVENTIONAL METHODS OF VITAMIN ANALYSIS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), 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: Data obtained from commonly used methods of assaying for riboflavin, vitamin B6, niacin, pantothenic acid, thiamine, biotin and vitamm B1 2 were compared to data obtained from vitamin analysis procedures employing protozoa as the test organisms. The protozoa were of the genera Tetrahymena and Ochromonas. Generally, the procedures employing Tetrahymena indicated higher levels of the vitamins in the foods analyzed, while the procedures employing Ochromonas indicated lower vitamin levels than the corresponding commonly used methods of vitamin analysis. Both protozoan and the commonly used methods for analysis of vitamins indicated higher levels of vitamins in food samples when the sample extracts received enzymatic as well as acid hydrolysis treatments. Neutralization salts formed during vitamin extraction procedures were found to interfere with both the conventional and the protozoan methods. High-acid foods (e.g., orange and tomato juices) were found to inhibit the growth of Tetrahymena. Further studies are required to develop optimal methods of vitamin extraction and analysis in order to quantify the biologically available vitamin contents of foods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb08486.x
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  • 3
    Electronic Resource
    Electronic Resource
    FLUORESCENT QUANTITATION OF BIOLOGICALLY ACTIVE AMINES IN FOODS WITH 7-CHLORO-4-NITROBENZOFURAZAN (NBD-CI) (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 39 (1974), 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 usefulness of 7-chloro-4-nitrobenzofurazan (NBD-CI) for the quantitative fluorescence detection of biologically active amines commonly found in fermented foods was studied. The reagent was found to be advantageous when compared to ortho-phthaldehyde and ethylene diamine due to the simplicity of derivative formation and ability to form fluorescent derivatives with a variety of biologically active amines. NBD-CI was shown to form quantitative derivatives with tyramine, tryptamine and histamine. There was a limited linear response for tryptamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1974.tb02910.x
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  • 4
    Electronic Resource
    Electronic Resource
    A LIQUID SCINTILLATION TECHNIQUE FOR MICROBIAL VITAMIN ANALYSES (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), 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: A radiometric procedure for the assay of the B-vitamins was investigated. The method, based on the release of 14CO2 from C-14 labeled glucose, gave proportional responses to vitamin concentration for thiamin, pyridoxine, and pantothenic acid. This procedure was not significantly faster than measuring increases in absorbance due to growth when bacteria and yeast were used as test organisms. However, for the protozoan assay of thiamin with Ochromonas danica, the analysis time was decreased from 4-5 days to 20 hours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb09140.x
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  • 5
    Electronic Resource
    Electronic Resource
    VITAMIN ANALYSIS BY MICROBIAL AND PROTOZOAN ORGANISMS: RESPONSE TO FOOD PRESERVATIVES AND NEUTRALIZATION SALTS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), 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: Vitamin analyses using protozoa (Tetrahymena pyriformis, Ochromonas danica and Ochromonas malhamensis) as test organisms were found to he affected by lower concentrations of neutralization salts than were the vitamin analyses which used bacteria and yeast as test organisms. Neutralization salts are formed during vitamin extraction procedures. Growth of protozoa and yeast was affected by the food preservatives-sodium sorbate, sodium propionate and sodium benzoate. Except for sodium benzoate inhibition of Lactobacillus leichmannii, the growth of bacterial test cultures was not affected by these chemicals. Levels of the neutralization salts and food preservatives in vitamin assays that are required to affect the growth of the test organisms were calculated. These levels were compared to the concentrations of salts formed by accepted vitamin extraction procedures to determine the dilutions of sample extracts necessary to avoid interference. Similar calculations were completed to determine minimal dilutions of foods necessary to avoid the effects of food preservatives on the test organisms. Acids and bases that neutralized to form salts that had the least effect on the growth of the test cultures were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1979.tb08485.x
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  • 6
    Electronic Resource
    Electronic Resource
    Cytogenetic, genetic and teratogenic investigations following exposure to homogeneous high strength magnetic fields
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 85 (1981), S. 286 
    Details
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-1161(81)90178-3
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  • 7
    Electronic Resource
    Electronic Resource
    Channeling on boron clusters in silicon (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5032-5037 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low energy ion implantation at high doses of boron (〉1015 cm−2) in Si is necessary for the fabrication of ultrashallow junctions but can result in the undesirable presence of boron clusters. Values for the dimensions of the lattice distortions in the implanted Si are obtained by comparing the enhanced dechanneling and the direct scattering peak in the region with clusters in a channeled Rutherford backscattering spectrometry spectrum to those from Monte Carlo calculations on a curved crystal structure. Values of about 0.17 and 65 nm are found for the maximum deformation and the length of the distortions in the crystal, respectively, which implies that the lattice distortions extend significantly outside the layer in which the B clusters are supposed to be present. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1406968
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of a partially oxidized calcium cathode on the performance of polymeric light emitting diodes (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 1376-1382 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated the influence of the presence of oxygen during the deposition of the calcium cathode on the structure and on the performance of polymeric light emitting diodes (pLEDs). The oxygen background pressure during deposition of the calcium cathode of polymeric LEDs was varied. Subsequently, the oxygen depth distribution was measured and correlated with the performance of the pLEDs. The devices have been fabricated in a recently built ultraclean setup. The polymer layers of the pLEDs have been spincoated in a dry nitrogen atmosphere and transported directly into an ultrahigh vacuum chamber where the metal electrodes have been deposited by evaporation. We used indium–tin–oxide as anode, OC1C10 PPV as electroluminescent polymer, calcium as cathode, and aluminum as protecting layer. We achieved reproducibility of about 15% in current and brightness for devices fabricated in an oxygen atmosphere of (very-much-less-than)10−9 mbar. For further investigations the calcium deposition was carried out in an oxygen atmosphere from 10−8 to 10−5 mbar. We determined the amount of oxygen in the different layers of the current–voltage-light characterized pLEDs with elastic recoil detection analysis and correlated it with the characteristics of the devices. The external efficiency of the pLEDs decreases continuously with increasing oxygen pressure, the current shows a pronounced minimum. The brightness mostly decreases with increasing oxygen with an indication of a slight minimum. PLEDs with completely oxidized calcium are not operational. The first contact of the pLEDs with the dry glove box environment leads to an immediate reduction of current and brightness which is caused by the cooling of the devices by several degrees. Determining reproducible characteristics of pLEDs in the vacuum requires the measurement of their temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1383577
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  • 9
    Electronic Resource
    Electronic Resource
    Erratum: "Ion-channeling analysis of boron clusters in silicon" [J. Appl. Phys. 90, 4741 (2001)] (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5507-5507 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1463446
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  • 10
    Electronic Resource
    Electronic Resource
    Ion-channeling analysis of boron clusters in silicon (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 4741-4747 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured axially channeled Rutherford backscattering spectra of Si1−xGex nanofilms in silicon(001). A step in the yield of the host crystal was found for off-normal axes at the depth of the nanofilm. The step was measured as a function of the angle between the incoming beam and the [011] axis and shows two maxima. It is found that Monte Carlo simulations assuming tetragonal distortion reproduce the experimental results. A universal curve was derived which enables determination of the tetragonal distortion from ion-channeling experiments, for a given film thickness. The results are compared with XRD measurements. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1405838
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