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  • Elsevier  (215)
  • Springer  (165)
  • Wiley-Blackwell  (38)
  • American Geophysical Union  (4)
  • 1990-1994  (422)
  • 1965-1969
  • 1935-1939
  • 1991  (422)
  • 1
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    A naphthalene glucoside lactone from Rhamnus wightii (1991)
    Elsevier
    Details
    Publication Date: 1991-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Hydrodesulfurization on MoS2/MgO (1991)
    Springer
    Catalysis letters 10 (1991), S. 27-33 
    Details
    ISSN: 1572-879X
    Keywords: Hydrodesulfurization ; magnesia support ; molybdenumsulfide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of Mo/MgO catalysts with loadings ranging from 2–12 wt% Mo were studied by oxygen chemisorption, X-ray diffraction and activity for thiophene hydrodesulfurization (HDS) reaction. The results obtained from the above measurements are compared with those on Mo/-γ-Al2O3. These results indicated that molybdenum is better dispersed on MgO. Hydrodesulfurization activity per g. Mo is found to be higher in the case of Mo/MgO. The higher activities are attributed to the increase in dispersion of Mo on MgO. A linear correlation is obtained between oxygen chemisorption and HDS activity. The parallelism between HDS and oxygen chemisorption is explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764733
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  • 3
    Electronic Resource
    Electronic Resource
    Investigations on crop responses to applied phosphorus in semi-arid vertisols of India (1991)
    Springer
    Nutrient cycling in agroecosystems 28 (1991), S. 31-40 
    Details
    ISSN: 1573-0867
    Keywords: Vertisols ; Indian black soils ; response to applied phosphorus ; P fixation in soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Pot studies were conducted to investigate the reasons for the lack of response to applied phosphorus (P) in six representative vertisols of semi-arid tropical regions of India having low available P status (2.8 to 7 ppm P). Studies with pearl millet and sorghum as test crops in two different seasons showed that these two crops responded significantly to the applied phosphorus in all the soils. The optimum P doses worked out from the regression of harvested biomass or grain on P doses, were found to be mostly above 27 ppm P in the range of 0 to 44 ppm P tried. The requirement of high doses of P for optimum yields was attributable to high P fixation capacities of these soils ranging from 43 to 75%. Regression analysis showed that P uptake by both the crops was significantly influenced by pH and P fixation capacity of the soils besides the applied and soil P. The differences between superphosphate and diammonium phosphate as sources of P were not consistent over crops or soils. Two consecutive applications of P resulted in marginal or no build up of soils' available P. Suggestions to manage the P fertilization problem of the semi-arid tropical vertisols on field scale were also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048853
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative study of spinodal decomposition in symmetric and asymmetric Cu-Ni-Cr alloys (1991)
    Springer
    Journal of materials science 26 (1991), S. 1485-1496 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Spinodal decomposition in three alloys of nominal compositions 71Cu-27Ni-2Cr, 45Cu-45Ni-10Cr and 33Cu-52Ni-15Cr were studied by X-ray diffraction technique and transmission electron microscopy. It was found that the first and third alloys are asymmetric in nature while the second is symmetric. The symmetric alloy was found to decompose faster than the asymmetric ones. The asymmetry of the side bands was found to be related to the proportion of phases in the alloy. Electron microscopic studies revealed that during coarsening the major phase increases its connectivity by isolating the minor phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544657
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  • 5
    Electronic Resource
    Electronic Resource
    Spore discharge in the red algae Bostrychia tenella and Caloglossa leprieurii from the Godavari estuary, India (1991)
    Springer
    Journal of applied phycology 3 (1991), S. 153-158 
    Details
    ISSN: 1573-5176
    Keywords: Bostrychia tenella ; Caloglossa leprieurii ; desiccation ; salinity ; seasonal effects on spore release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bostrychia tenella (Vohl.) J. Ag. and Caloglossa leprieurii (Mont.) J. Ag., two examples of species important for human consumption from estuaries in Asia, were studied with respect to spore formation and release with a long-term view to their mass cultivation. Plants were collected between January and December 1987 from three different regions of the Gautami Godavari estuary, India. Both species behaved rather similarly. Tetrasporophytic plants were present throughout the year, whereas carposporophytic plants were found only in certain months. Shedding of tetraspores was observed throughout the year, but with seasonal difference in their output. Carpospores were liberated from October to May when the material was available. Maximum shedding of carpospores and tetraspores was observed in December and January and the minimum number of tetraspores in August and carpospores in May. The maximum number of spores was liberated, when plants were submerged at 20% salinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003697
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  • 6
    Electronic Resource
    Electronic Resource
    Micellar effect of sodium dodecyl sulfate on the reactions between iron(II) and p-benzoquinone, and iron(III) and hydroquinone (1991)
    Springer
    Reaction kinetics and catalysis letters 43 (1991), S. 209-216 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследовали мицеллярный эффект додецилсульфата натрия (ДСН) на начальной стадии реакции 1) Fe(II) с парабензохиноном и 2) Fe(III) с гидрохиноном. В первом случае наблюдали ускорение и кривая зависимости скорости от концентрации ПАВ-а обладает максимумом. ДСН оказывает ингибирующий эффект на вторую реакцию. Исходя из модели Березина, произведен кинетический анализ.
    Notes: Abstract The micellar effet of sodium dodecyl sulfate (SDS) on the initial stages of the reaction between (1) Fe(II) and p-benzoquinone, and (2) Fe(III) and hydroquinone have been investigated. In the former case acceleration was observed, the rate-[surfactant] profile showing a maximum. SDS has an inhibitory effect on the latter reaction. Kinetic analysis has been carried out using Berezin's approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02075435
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis, dielectric and X-ray powder diffraction studies of Fe(III), Co(II) and Ni(II) chelate polymers with 5,8-dihydroxy-1,4-naphthoquinone (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 191 (1991), S. 177-189 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Koordinationspolymere von 5,8-Dihydroxy-1,4-naphthochinon mit Fe(III), Co(II) and Ni(II) wurden hergestellt und durch Elementaranalyse, DSC, IR-Spektroskopie und Messung der magnetischen Momente charakterisiert. Aus den DSC-Daten wurden die Reaktionsordnungen und die Aktivierungsenergien des thermischen Abbaus der Polymeren berechnet. Die elektrischen Eigenschaften wie Dielektrizitätskonstante und Wechselstromleitfähigkeit wurden gemessen. Aus Röntgen-Pulverdiagrammen wurden die Elementarzellenparameter berechnet und die Kristallsymmetrie bestimmt.
    Notes: Coordination polymers of Fe(III), Co(II) and Ni(II) with 5,8-dihydroxy-1,4-naphthoquinone have been synthesized and characterized by elemental analysis, IR and magnetic moment studies. From DSC data, the order of the decomposition reaction and the activation energy for the decomposition of the different polymers have been evaluated. Electrical properties like the dielectric constant and the dc conductivity of the polymers have been measured. From x-ray powder diffractograms cell parameters were calculated, the pattern indexed, and the symmetry determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051910112
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis, characterization, and evaluation of poly[n-alkyl(oxy)-n-hexyl acrylates] (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 935-945 
    Details
    ISSN: 0021-8995
    Keywords: 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: Oxoalkyl acrylates of long-chain 7-oxo alcohols were synthesized as intermediate monomers for the preparation of poly[n-alkyl (oxy) -n-hexyl acrylates] for the first time. These polymers have wide applications as fluidity improvers (pour point depressants) for petroleum crude oils. Characterization of all the intermediate monomers was done by IR, 1H-NMR, and MS, and that of polymers by IR, 1H-NMR, and GPC. These polymers were systematically investigated for their efficacy as pour point depressants on three types of high waxy Bombay High (Indian) crudes. In addition to establishing the pour points, relevant rheological parameters of the untreated and the additive-treated crude oils were determined in the laboratory with a rotational viscometer. Results of the crude oils that were pre- and posttreated with these new polymers have shown enhanced activity of flow properties as compared to the crudes that were treated with poly(n-alkyl acrylate) flow improver.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420407
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  • 9
    Electronic Resource
    Electronic Resource
    Thermally stimulated depolarization currents in poly(acrylamide) films (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 379-383 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Mechanismus der Ladungsspeicherung in Poly(acrylamid)-Filmen wurde mit der Methode der thermisch stimulierten Depolarisationsströme (TSDC) untersucht. Die TSDC wurden in Abhängigkeit von der Feldstärke, der Temperatur und der Dauer der Polarisation bei verschiedenen Aufheizgeschwindigkeiten gemessen. Bei niedrigen Polarisationstemperaturen wurde in den TSDC-Spektren nur ein Peak gefunden, bei höheren Polarisationstemperaturen traten zwei Peaks auf. Der erste Peak wurde der Dipolorientierung, der zweite der Raumladungspolarisation zugeordnet.
    Notes: The charge storage mechanism in poly(acrylamide) films was studied by means of the technique of thermally stimulated depolarization currents (TSDC). The TSDC were measured as a function of field strength, temperature and time of polarization in dependence on the heating rate. One peak was observed on the TSDC spectra at low polarizing temperatures, while two peaks occurred for higher polarizing temperatures. The first peak was attributed to dipole orientation and the second one to space charge polarization.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420809
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  • 10
    Electronic Resource
    Electronic Resource
    Electrical conduction in pure and doped poly(acrylamide) films (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 465-469 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die stationäre elektrische Leitung in aus der Lösung erhaltenen Poly(acrylamid)-Filmen wurde im Temperaturbereich von 303 bis 450 K bei unterschiedlichen Feldstärken untersucht. Es wurde festgestellt, daß die Richardson-Schottky- und Poole-Frenkel-Mechanismen gleichzeitig auftreten. In mit Eosin bzw. Rhodamin B dotierten Filmen wurde die elektrische Leitung der Bildung von Charge-Transfer-Komplexen zugeschrieben.
    Notes: The steady state electrical conduction in solution grown poly(acrylamide) films was investigated in the temperature range 303 to 450 K at different field strengths. It was found that the Richardson-Schottky and Poole-Frenkel mechanisms operate simultaneously. In films doped with cosin and rhodamine B, respectively, the electrical conduction was attributed to the formation of charge transfer complexes.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420915
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