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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 115 (1984), S. 993-995 
    ISSN: 1434-4475
    Keywords: Stability constants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die Komplexe von Ce(III), Pr(III), Nd(III), Sm(III), Tb(III), Dy(III) und Ho(III) mit 5-Chlorpyridin-2,3-diol (CPD) in 50% Dioxan-Wasser bei einer Ionenstärke von 0,1M (NaClO4) und einer Temperatur von 35±0,1 °C potentiometrisch untersucht. Die Proton-Ligand-Stabilitätskonstante vonCPD und die Stabilitätskonstanten der Metallkomplexe wurden nach der Methode vonCalvin-Bjerrum mit derIrving-Rossotti-Modifikation bestimmt. Die Reihenfolge der Stabilitätskonstanten ergab sich folgendermaßen: Ce 〈 Pr 〈 Nd 〈 Sm 〈 Tb 〈 Dy 〈 Ho.
    Notes: Abstract The complexes of some rare earths [Ce(III), Pr(III), Nd(III), Sm(III), Tb(III), Dy(III), and Ho(III)] with 5-chloropyridine-2,3-diol (CPD) were studied potentiometrically in 50% dioxane-water at a ionic strength of 0.1M (NaClO4) at 35±0.1 °C. The proton-ligand stability constant ofCPD and the stability constants of its complexes with the metals have been determined using theCalvin-Bjerrum technique as modified byIrving andRossotti. The order of the stability constants is found to be Ce 〈 Pr 〈 Nd 〈 Sm 〈 Tb 〈 Dy 〈 Ho.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 40-41 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is well known that the global thunderstrom activity is at a maximum at the temperate latitude and decreases with increasing latitudes7. The parameters or mechanisms controlling the guidance of thunderstorm-generated low-frequency waves are less effective at low latitude, however, which seems to ...
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 36 (1980), S. 552-553 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Lycorine, an alkaloid was isolated from the bulbs ofHymenocallis littoralis Salisb. The percentage of lycorine was 0.00083. When sprayed on cabbage leaves this alkaloid inhibited the feeding of the desert locust,Schistocerca gregaria at 0.05% concentration.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 58 (1980), S. 129-136 
    ISSN: 1432-2242
    Keywords: Barley ; Genetic potential ; Seed protein ; Selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Hybridization followed by continuous selection of lines of barley from different cross-combinations involving high protein-high lysine genotypes and the agronomically superior strains resulted in breaking the negative correlations between 1000 grain weight and high protein content and high DBC values. The methodology of DBC-Kjeldahl protein adopted in the present study is likely to be useful in identifying high lysine lines. The present study has shown considerable variability with respect to protein content and grain weight and has provided interesting genotypes which can be used in synthesising lines with improved nutritional quality and productivity in barley. The success in breaking the undesirable linkages to factors that impair the endosperm development is due to sufficient genetic variability in the initial breeding material as well as the use of suitable breeding procedures like the full-sib mating in the early segregating generations.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 4 (1981), S. 583-589 
    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: Abstract Effect of addition of various concentrations of stabilizers on poly (1-butene) [IPB] film has been studied, by measuring rate of protection and protective effectiveness through light scattering technique and UV spectral measurements. It has been observed that after a certain percentage of stabilizer addition there was not any further change.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 5 (1981), S. 443-450 
    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: Abstract Thin films of isotatic poly(l-butene) irradiated with a monochromatic light of 253.7 nm undergo random chain-scission in air in the temperature range of 267.0–313.0 °K. Quantum yields in the absence and presence of different stabilizers have been determined using a potassium ferrioxalate actinometer from 0.0188 to 0.00027 scissions per absorbed photon. Quantum yields for scission were independent of intensity. Light scattering technique was used to determine the rate of links breaking for polymeric systems. A saturation limit in photostabilization of isotatic poly(1-butene) by the stabilizers was achieved beyond 0.8, 0.7, 0.6 and 0.5 wt.% of copper(II) bis(1,3-diphenyltriazine-N-oxide) [CPTO], 1.3-diphenyltriazine-N-oxide) [HPTO], o-phenanthroline bis(1,3-diphenyltriazine-N-oxide)cobalt(II) [CPPTO] and 2,4-diphenyl-6-(2′-hvdroxyphenyl)-s-triazine [PHPT], respectively in the matrix of polymer film.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 6 (1981), S. 175-181 
    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: Abstract An investigation of the photo-oxidative degradation and stabilization of IIR and SBR in the temperature range of 258 to 313°K in air with a monochromatic light of 366 nm in the absence and presence of various concentrations of the different copper chelates has been described. The stabilizer performance in IIR and SBR was accessed by carbonyl index and quantum yield measurements. The changes of IIR and SBR during the irradiation with an ultra-violet light (366 nm) have been conducted by viscometrically and actinometric techniques. Irradiations were conducted on the films at 0, 2, 4, 6, 8, 10, 12 and 14 hours and various parameters were obtained.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 2 (1980), S. 403-409 
    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 Ultrasonic velocity measurements have been made in solutions of polyesterimide. It has been observed that by the application of Rao relationship and Nomoto equation, the ultrasonic velocity and density measurement can give useful information about the structural parameters of the copolymers.
    Type of Medium: Electronic Resource
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  • 19
    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 Ultrasonic velocity and density measurements have been made in solutions of polyamic acids of differing molecular structures over extended range of concentration at room temperature. It has been shown that the Rao formalism is applicable to polyamic acid solutions employing Nomoto equation. The consequence of the above finding is discussed for the structural analysis of polymers of complex structures. The flexibility of the polymer chains has also been discussed in terms of the compressibility evaluated from ultrasonic velocity and density data of polymer solution.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 9 (1983), S. 445-449 
    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: Abstract This work describes the results of the 3-(o-carboxyphenyl)-1-phenyltriazine-N-oxide [CPT] -sensitized and copper(II) bis-3-(o-carboxyphenyl)-1-phenyltriazine-N-oxide [CCPT] — stabilized photodegradation of isotactic poly(1-buténe) film in air at a temperature range of 267–313 °K with a light intensity flux 2.38 × 10−9 einsteins sec−1cm−2. The degradation was followed by viscometry, potassium ferri-oxalate actinometry and by measuring carbonyl index. The intrinsic viscosity, quantum yield and carbonyl index depend on several factors, i.e., temperature and triazene concentration.
    Type of Medium: Electronic Resource
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