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  • 11
    Electronic Resource
    Electronic Resource
    0.8 eV excitation of the quenched EL2* level in semi-insulating GaAs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2221-2222 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Excitation with 0.8 eV of the optically bleached state of semi-insulating GaAs results in a recovery of the 1–1.3 eV photocurrent. This recovery is found to occur in the advanced stages of the photoquenching with 1.1-eV light, when both the extrinsic and the intrinsic photocurrent are quenched. Such an observation is related to the existence of different metastable configurations, which are characterized by different optical sensitivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344274
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  • 12
    Electronic Resource
    Electronic Resource
    Rheological monitoring of curing reaction of an epoxy system: effect of heating rate (2000)
    Springer
    Polymer bulletin 43 (2000), S. 519-526 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this work, we present a rheological study of the non-isothermal curing reaction of an epoxy resin, diglycidyl ether of bisphenol A, with aliphatic amines of different functionalities. The reaction was carried out under a linear temperature program and the epoxy-amine mixtures were prepared at different epoxy groups to amine-hydrogen ratios. The effect of vitrification on the curing reaction is analyzed as a function of the heating rate. At low heating rates, the viscous modulus, G″, presents two peaks. The first peak is due to the vitrification-devitrification phenomenon that takes place during cure. At the second peak, the sample is completely cured and the decrement is G″ is only due to the temperature increment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050010
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  • 13
    Electronic Resource
    Electronic Resource
    A physiological study of formate dehydrogenase, formate oxidase and hydrogenlyase fromEscherichia coli K-12 (1972)
    Springer
    Antonie van Leeuwenhoek 38 (1972), S. 479-491 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Escherichia coli was grown under various culture conditions. Variations in the levels of formate dehydrogenase which reacts with methylene blue (MB) or phenazine methosulfate (PMS) (N enzyme), formate dehydrogenase which reacts with benzyl viologen (BV) (H enzyme), formate oxidase and hydrogenlyase were analyzed. It was observed that formate dehydrogenase N and formate oxidase were induced by nitrate and repressed by oxygen. Synthesis of formate dehydrogenase H and hydrogenlyase was induced by formate and repressed by nitrate and oxygen. Selenite was required for the biosynthesis of formate dehydrogenase H and hydrogenlyase. Activity of both formate oxidase and hydrogenlyase was inhibited by azide and KCN but not by N-heptyl hydroxyquinoline-N-oxide (HOQNO); on the other hand, formate oxidase was extremely sensitive to HOQNO. Data were obtained which suggest that cytochromes are not involved in hydrogen formation from formate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328115
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  • 14
    Electronic Resource
    Electronic Resource
    Latent infections of in vitro anthurium caused by Xanthomonas campestris pv. dieffenbachiae (1994)
    Springer
    Plant cell, tissue and organ culture 39 (1994), S. 55-61 
    Details
    ISSN: 1573-5044
    Keywords: Anthurium andraeanum ; callus culture ; contaminants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Latent infections of tissue-cultured Anthurium andraeanum Lind. caused by the blight pathogen, Xanthomonas campestris pv. dieffenbachiae (McCulloch & Pirone) Dye, were examined. The pathogen survived in or on callus for over 4 months without producing symptoms in callus or turbidity in the medium. The pathogen survived for more than 1 year on or within stage II shoots without producing symptoms and was successively transferred three times as latently infected shoots were multiplied. The pathogen did not grow or survive for more than 2 weeks in Murashige and Skoog medium lacking plant material. The addition of coconut water enhanced bacterial growth and produced turbidity in culture media. Latently infected in vitro anthuriums may be inoculum sources for subsequent outbreaks of the disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037592
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  • 15
    Electronic Resource
    Electronic Resource
    Thermal effects in highly dispersed iron catalysts (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 357-362 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Mössbauer spectra of three Fe/SiO2 catalysts with 5 wt% iron content show the presence of several Fe species and display different magnetic behaviours when the precursors are subjected to various thermal treatments. Based on the Mössbauer parameters and CO chemisorption measurements, the average crystal sizes of the catalysts are estimated and discussed in connection with the thermal pretreatment severity and magnetic properties of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074299
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  • 16
    Electronic Resource
    Electronic Resource
    New method for90Sr determination in liquid samples (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 191 (1995), S. 315-322 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A method has been developed for measuring90Sr activity in liquid samples. After concentrating strontium from the sample by coprecipitation with calcium phosphate, the residue is dissolved in 8N HNO3 and passed through an extraction chromatographic column (Sr.Spec) containing a new material that selectively retains strontium. This is eluted from the column with 0.05N HNO3 and counted by liquid scintillation. Measurement is performed using a double window method, that allows a rapid and single determination of90Sr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038227
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  • 17
    Electronic Resource
    Electronic Resource
    Salt effects in the reaction of hexacyanoferrate(II) with periodate (1983)
    Springer
    Reaction kinetics and catalysis letters 22 (1983), S. 1-6 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Описываются эффекты различных солей на кинетику окисления ферроцианида с помощью периодата. При низких концентрациях добавляемых солей (〈0,1 M) в реакции обнаруживается солевой эффект низкой специфичности. При более высоких концентрациях порядок эффективности щелочных катионов следующий: Li+〉K+〉Na+. Ионы тетраалкиламмония оказывают сравниваемый (Et4 N+) или даже больший (Me4 N+) ускоряющий эффект, чем щелочные катионы.
    Notes: Abstract The effects of various salts on the kinetics of ferrocyanide oxidation by periodate are reported. The reaction exhibits salt effects of low specificity at low concentrations of the added salts (〈0.1 M). At higher concentrations, the effectiveness order for alkaline cations is Li+〉K+〉Na+ and tetralkylammonium ions have a comparable (Et4N+) or even greater (Me4N+) accelerating effects than alkaline cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064796
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  • 18
    Electronic Resource
    Electronic Resource
    Procedures to define Pu isotopic ratios characterizing a contaminated area in Palomares (Spain) (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 222 (1997), S. 81-86 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Plutonium isotopic ratios have been calculated in soils contaminated by the Palomares accident which occurred in 1966 (Almería, Southeastem Spain). Contrasted techniques have been used to determine the radionuclide activities:238Pu and238+240Pu were analysed by α-spectrometry prior purification on anion-exchange resins, the ratio239Pu/240Pu was estimated by α-spectra deconvolution and241Pu was directly measured by liquid scintillation counting and indirectly through quantification of in-grown241Am from aged plutonium discs. The mean activity ratios238Pu/239Pu,239Pu/240Pu,241Pu/239Pu, backdated to 1966, were 0.027±0.002 (1σ), 4.5±0.2 (1σ) and 8.2±0.8 (1σ), respectively, characterizing the accident of Palomares as the source term of the measured plutonium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034251
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  • 19
    Electronic Resource
    Electronic Resource
    Heavy Metal Analysis of Rainwaters by Nuclear Related Techniques: Application of APDC Precipitation and Energy Dispersive X-ray Fluorescence (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 245 (2000), S. 485-489 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The aim of the present work was the establishment of a procedure for the determination of several metals in rainwater, which includes a concentration step by precipitation with APDC, preceding the EDXRF determination. The influence of different factors (the repose time of the precipitate, the concentrations of APDC, the metal carrier and the oxidant agent, and others) upon the metal precipitation and filtration was investigated. An absolute EDXRF method was used for the quantification of the Fe, Co, Ni, Cu, Zn and Pb contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006784505075
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  • 20
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    Microemulsion polymerization of 1,3-butadiene (2010)
    Springer
    Details
    Publication Date: 2010-05-09
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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