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  • 1
    Electronic Resource
    Electronic Resource
    Use of p-chloranilic acid for the colorimetric determination of some antimalarials
    Amsterdam : Elsevier
    Talanta 33 (1986), S. 185-186 
    Details
    ISSN: 0039-9140
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-9140(86)80041-8
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular Complexes of some N-Aryldithiocarbamates with π-Electron Acceptors (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 121-127 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Molecular complexes; N-Aryldithiocarbamates; Solvent effects; Spectroscopy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Charge-transfer-Komplexe aus S-Alkyl-N-aryldithiocarbamaten und π-Elektronenakzeptoren (2,3-Dichlor-5,6-dicyano-1,4-benzochinon (DDQ), Tetracyanoethylen (TCNE) und Chloranil (CHL); stöchiometrisches Verhältnis: 1:1) wurden hergestellt und charakterisiert. Die spektroskopischen Eigenschaften und die Stabilitäten der Verbindungen wurden untersucht und werden im Zusammenhang mit Parametern wie Struktur, π-Elektronenakzeptoraffinität und Lösungsmittelpolarität diskutiert. Es zeigt sich, daß die Komplexe hauptsächlich dem n-π-Typ angehören, in dem die Wellenfunktion des Grundzustands vorwiegend durch eine nichtbindende Struktur beschrieben werden kann. Die Ionisationspotentiale der Donatoren werden aus den charge-transfer-Übergangsenergien ihrer Komplexe abgeschätzt.
    Notes: Summary.  Solid 1:1 CT complexes formed between some S-alkyl-N-aryldithiocarbamates and π-electron acceptors (2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), tetracyanoethylene (TCNE), chloranil (CHL)) are synthesized and characterized. Spectral characteristics and stability of the complexes are investigated and discussed in terms of donor molecular structure, π-acceptor electron affinity, and solvent polarity. It is deduced that the complexes are mainly of the n-π type where the ground state wave function can be described primarily by the non-bonding structure. Ionization potentials of the donors are estimated from the CT transition energies of their complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010148
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  • 3
    Electronic Resource
    Electronic Resource
    InternalK-conversion coefficients of transitions in182W (1970)
    Springer
    The European physical journal 236 (1970), S. 417-423 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheK-conversion coefficients of seven low energy transitions (∼100–400 keV) in182W following the decay of182Ta have been determined by the NPG method using the newly reported γ-ray intensities measured by Ge(Li) detectors. The results are compared with theoretical values deduced from the tabulations of Rose, Sliv and Band, and Pauli. The weak peak corresponding to theK-conversion line of the 351.3 keV transition could be observed in accordance with the previous investigations, however the existance of the previously reported 146.3 keV transition could not be confirmed. Also theK-conversion line of the recently reported 110.4 transition could not be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394133
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  • 4
    Electronic Resource
    Electronic Resource
    The subsistence crisis and migration in the Sahelian Zone of the Sudan — (1991)
    Springer
    GeoJournal 25 (1991), S. 39-45 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract Burush is a small village in the N Sahelian Zone of the Sudan, whose population are basically sedentary agriculturists. The recurring drought conditions of the last two decades have significantly influenced the local resource base, so that the subsistence of the majority of the households was highly challenged. Nevertheless, the people are still surviving and resisting. The explanation of this resistence can be sought in the endogenous coping mechanisms adopted by the people. One of these mechanisms is migration, especially the seasonal labour migration of the heads and grown-up members of households, which used, even in good years, to be highly integrated in the strategies of survival of the majority of households. However under the recurring crop failures and the growing competition in the seasonal labour opportunities, this seasonal migration is changing gradually into stays of longer duration in the traditional destinations of seasonal labour. On the other hand, the male members of households are actively involved in migration of long duration, especially into the urban centres. Yet, the constributions of these migrant members to the subsistence of their households are limited, because of the rising costs of living in uurban centres as compared with the incomes. The rehabilitation of Burush lies obviously in the development of long-term strategies which aim at strengthening the endogenous resilience mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179767
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  • 5
    Electronic Resource
    Electronic Resource
    Ecdysones and plant growth regulators induce solitarious characters and reduce fertility in the desert locust (1976)
    Springer
    Entomologia experimentalis et applicata 19 (1976), S. 214-220 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les produits utilisés sont: un extrait brut des feuilles de Podocarpus gracilior, considéré comme renfermant une phyto-ecdysone (PhE); de la 20-hydroxyecdysone ou zoo-ecdysone (ZE); un régulateur de la croissance végétale, le 2,2-diméthyl-hydrazide de l'acide succinique (Alar® 85). Chacun de ces produits a été injecté, en une seule fois, à une dose non toxique, à des lots de 30 larves grégaires (♂ et ♀) de Sch. gregaria, larves du 4ème stade venant de muer. En aucun cas on n'a observé une transformation complète de l'adulte vers le type solitaire, mais les indices biométriques montrent une tendance vers les types transiens. Tous les composés chimiques testés diminuent la durée de la vie larvaire et la fertilité des adultes s'est montrée réduite par le composé Alar® 85. L'action des substances testées est discutée par comparaison avec les effets connus de composés chimiques plus complexes à propriétés qualifiées de néoténiques, telle que l'hormone juvénile et ses analogues.
    Notes: Abstract When a zoo-ecdysone (crustecdysone), a supposed phyto-ecdysone (from leaves of Podocarpus gracilior), or a plant growth regulator (Alar® 85) were injected into newly ecdysed, gregarious, fourth-instar nymphs of the desert locust, Schistocerca gregaria (Forsk.), the morphometric ratios of the resulting adults were intermediate between the two extreme phases. In no case a complete transformation to the solitarious form was obtained. Only the plant growth regulator resulted in the sterility of the adults. The possible importance of non-neotenic substances in locust control is discussed in relation to neotenic compounds which are structurally more complicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302056
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics And Mechanism of The Non-isothermal Decomposition. Some Ni(II)-carboxylate-imidazole ternary complexes (2000)
    Springer
    Journal of thermal analysis and calorimetry 62 (2000), S. 769-780 
    Details
    ISSN: 1572-8943
    Keywords: DTG ; Ni(II)-carboxylate-imidazolecomplexes ; TG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal decomposition of some Ni(II)-carboxylate-imidazole complexes in a nitrogen atmosphere was studied non-isothermally. From the non-isothermal thermoanalytical data, it was found that these complexes decompose through a stepwise release of imidazole molecules and/or CO ones forming unstable intermediates which produce metal oxide or the metal as a final decomposition product. TG in conjunction with DTG were used to evaluate the kinetic and thermodynamic parameters of the decomposition reaction. The kinetic studies were performed employing a computer-oriented kinetic analysis of each set of W-T data obtained under constant heating rate. The diffusion processes are the decisive mechanisms for the decomposition. The values of ΔE, A, ΔH, ΔS and ΔG for activation were calculated for the complexes and correlated to variation in their structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026789828387
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  • 7
    Electronic Resource
    Electronic Resource
    Valency stabilization of polyvalent ions during gamma irradiation of their aqueous solutions by sacrifical protection (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 207 (1996), S. 171-182 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Polyvalent ions are very sensitive to gamma irradiation in aqueous solutions. The present work is a part of a more comprehensive study dealing with the stabilization of certain oxidation states of some polyvalent ions during their gamma irradiation in aqueous systems. Sulphite ions, being well known reducing agents has been used for stabilizing Fe(II) ions in aqueous solutions during gamma radiolysis. Fe(II) ions in solution are known to be readily oxidized by gamma radiations in such a way that a 10−3N solution decays completely in about 2 hours at a dose rate 310 Gy/hr. In presence of an excess of sulphite ions it was found that Fe(II) ions were stabilized for extended time periods depending on the amount of sulphite ions used. The conditions of stabilization and its limits in the studied case has been identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036537
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  • 8
    Electronic Resource
    Electronic Resource
    Valency stabilization of polyvalent ions during gamma-irradiation of their aqueous solutions by sacrificial protection (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 461-471 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The various aspects of valency stabilization of polyvalent ions during γ-radiolysis have been further investigated. Ce(IV) ions, which are normally reduced in their aqueous solution, were found to be stabilized for increasing periods of time when they were irradiated in the presence of increasing amounts of bromate ions. It was found that the addition of about fifteen times excess of bromate ions to a 10−3 N Ce(IV) solution stabilized the cerium ions in the tetravalent state for about 120 hours during irradiation at a dose rate of 336 Gy/h. Increasing the amount of bromate used resulted in a subsequent increase in the protection time. It has been also noted that while bromate ions protected Ce(IV) in solution, the latter ions showed a clear protective effect on the bromate used, i.e., there is a mutual protective effect. The probable mechanisms, conditions and limitations of the protection process have been discussed. Based on the data obtained in the present work, it has been suggested that the protection of Ce(IV) ions by bromate ions in aqueous solutions during γ-radiolysis is very probably due to the preferential interaction of bromate with the reducing radiolysis products of water which are capable of reducing Ce(IV) to Ce(III).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039712
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  • 9
    Electronic Resource
    Electronic Resource
    Lebenszyklus von Meloidogyne incognita acrita (Kofoid & White) Chitwood (Nematoda, Heteroderidae) in Wurzeln der Baumwolle, Gossypium barbadense L (1983)
    Springer
    Journal of pest science 56 (1983), S. 153-154 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Es wurden die Entwicklungszeiten der Stadien des WurzelnematodenMeloidogyne incognita acrita in Baumwoll-Wurzeln in Ägypten festgestellt. Die den Wurzelbefall tätigenden Zweitlarven waren 24 Stunden nach Hinzugabe zu den Sämlingen zu 50,0% und nach 72 Stunden zu 86,7% in die Wurzeln eingedrungen. Die L3 traten ab 7., die L4 ab 11., die adulten Weibchen ab 24. und die Eipakete ab 32. Tag nach Einsetzen der L2 auf. Das ergibt eine Gesamtentwicklung von Ei zu Ei von i. M. 35,5 Tagen.
    Notes: Abstract The incubation period ofM. incognita acrita eggs took 24–72 hours till the appearance of the second larval stage hatching from eggs in the laboratory at 25±5°C and at 60±5 R. H. The second larval stage, was observed in cotton roots 48 hours after the addition of it to soil beside cotton seedlings. The 3rd and 4th larval stage and adult female were observed in cotton roots 7, 11, and 24 days, respectively, after the addition of second larval stage to soil beside cotton seedlings. The total life cycle ofM. incognita acrita on cotton, (Gossypium barbadense) lasted for 33–38 days, at 25±5°C and at 60±5 R. H.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01908777
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization and thermally stimulated depolarization current studies of rhodamine-dye-doped poly(acrylonitrile-butadiene-styrene) films (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 105-111 
    Details
    ISSN: 0959-8103
    Keywords: poly(acrylonitrile-butadiene-styrene) ; rhodamine doping ; TSDC spectra ; thermally stimulated depolarization ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: IR and UV-absorption spectra, and the thermally stimulated currents of pure and Rhodamine-6G-doped poly(acrylonitrile-butadiene-styrene) (Rhdoped ABS) films were investigated. Structural characteristics could be specified from these techniques. Both IR and UV-absorption studies revealed a modification of the structure of ABS on blending with Rhodamine 6G: Rh molecules are partially dispersed in the ABS matrix and partially attached as side groups to the ABS backbone. Thermally stimulated depolarization current (TSDC) studies confirmed this result. The results revealed that incorporation of Rh 6G in ABS locks the dipole in the ABS matrix after electric poling. The TSDC spectra have been found, depending on the polarization temperature, to be characterized by three peaks. The phenomenon of the existence of these current maxima is discussed and analysed in terms of dipolar and ionic relaxations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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