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  • 1
    Electronic Resource
    Electronic Resource
    Oxygen and Phytoplankton Changes in the Newly Forming Volta Lake in Ghana (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 218-219 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The plankton and the various physico-chemical factors of the water are being investigated by members of the Volta Basin Research Project of the University of Ghana1. An intensive investigation has been undertaken of samples collected at Ajena, 2 miles north of the dam site at Akosombo. At first, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/209218a0
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Carbon Dioxide in the Calcite–Sodium Oleate Flotation System (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1255-1255 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To study the calcite-carbon dioxide-water system transparent calcite crystals were wet ground and sieved. About 20 g of moist samples of -120+140 ASTM mesh size range were treated with 150 ml. of distilled and deionized water in a 500 ml. reagent bottle and then carbon dioxide was bubbled ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171255a0
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  • 3
    Electronic Resource
    Electronic Resource
    Role of Growth Regulators in the Uptake and Metabolism of s -Triazine Herbicide by Tea Leaves (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 215-216 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The methods used to study the absorption of 14C-propazine by detached tea leaves were slightly modified from those described by Biswas1, and Biswas and Rogers3, to study the absorption of s-triazine herbicides and gibberellic acid respectively. One variety of tea, 'Nyasaland', was grown at 65 -75 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207215a0
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Steroids on Chrysanthemum in relation to Growth and Flowering (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 917-918 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eleven common steroids of both plant and animal origin were selected at random (ranging from C19 to C30). These were as follows: cholesterol (C27); (3-sitosterol (C29); cholesteryl acetate (C29); lanosterol (C30); A-5-3-acetoxy-bisnorcholenic acid (C24); digitalin (C23); glycocholic acid (C26); ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213917a0
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  • 5
    Electronic Resource
    Electronic Resource
    Sudden Changes in the Intensity of High Energy X-Rays from Sco X -1 (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 51-53 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 summarizes the experimental observations. The excess counts due to Sco X-l were obtained by subtracting the counting rates corresponding to the north direction which did not include any known X-ray sources. The atmospheric attenuation was taken into account from the thickness of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224051a0
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrasonic degradation of macromolecules in solution. Study of degradation kinetics by estimation of free-radical scavenger DPPH and solution viscosity measurementsProd. No. 1357 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1089-1098 
    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: The kinetics of degradation of butyl rubber in two solvents, cyclohexane and toluene, was studied by two independent techniques: viscosity measurements and free-radical estimation as a function of DPPH consumed. The general shape of the rate curves in the two cases is similar, but not identical. The rate given by estimation of DPPH is faster than that obtained from solution viscosity data. This has been attributed to the inherent limitations of the two methods for the quantitative determination of the number of breaks occurring in the polymer molecules. The rate is also reduced as the viscosity of the solution medium is increased, which may be correlated with the reduction of the cavitation effect responsible for degradation. The degradation rates in two solvent media initially having the same viscosity were unequal. This may be due to different solvent-solute characteristics, which means that the viscosity and cavitation change to different extents in the two cases throughout the course of degradation. The limiting degree of Polymerization (DP)∞ obtained after prolonged irradiation has been found to be dependent on parameters such as intensity of irradiation, solution viscosity, and initial DP of the molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100801
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization of N-vinylearbazole with vanadium compounds. Part I. Polymerization with vanadium pentoxide and metal vanadates (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 124 (1969), S. 263-273 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In Gegenwart von Vanadiumpentoxid als heterogenern Katalysator Wurde N-Vinylcarbazol (NVC) in Substanz polymerisiert. Die Polymerisationsgeschwindigkeit hängt vom Verhältnis des Katalysators zum Monomeren ab. Es wurde ein kationischer Reaktionsmechanismus vorgeschlagen, und es wurde versucht, die Rolle der V2O5-Oberfläche bei der Polymerisation aufzuklären. Es wird vermutet, daß die π-Säureeigenschaft des V5⊕-Ions bei der Initiierung der Polymerisation miteinbezogen werden muß.Die Wirkung einer Anzahl von Zusätzen auf die Polymerisationsgeschwindigkeit wurde untersucht; das Ergebnis bekräftigt die Annahme eines kationischen Verlaufs.Es wurde auch die katalytische Wirksamkeit einer Anzahl von Metallvanadaten bei der Polymerisation von NVC untersucht. Es ergab sich eine hinreichend gute Bezichung zwischen der katalytischen Wirksamkeit und dem elektronegativen Charakter des metallischen Bestandteils.
    Notes: Bulk polymerization of N-Vinylcarbazole (NVC) has been carried out using vanadium pentoxide as the contact catalyst. The rate of polymerizatlon has been found to depend upon catalyst to monomer ratio. A cationic mechanism has been suggested and the role of V2O5 surface in the polymerization has been tentatively analyzed. The π-acid characteristies of V5⊕ ion is believed to be involved in initiating the polymerization. The effect of a number of additives on the polymerization rate has been studied, which endorses the cationic mechanism. The catalytic efficiency of a number of metal vanadates for the polymerization of NVC has also been studied. A fairly good correlation between the activity and electronegativity of the metallic moiety has been established.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021240127
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  • 8
    Electronic Resource
    Electronic Resource
    Interaction of polylysine with phosvitin and nucleic acids (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 124 (1969), S. 113-117 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die DNS-abhängige RNS-Synthese wird durch basische Proteine, wie Histone oder Polylysin, gehmmt: es wurde gefunden, daß dieser Hemmungseffekt durch Phosvitin, ein phosphoprotein, aufgehoben wird. Turbidimetrische Untersuchungen ergaben, daß Polylysin mit DNS iind RNS in stöchiometrischem Verhältnis reagiert.Es wird angenommen, daß diese Reaktion mit DNS die Ursache des Hemmungseffektes ist. Noch wirksamer als DNS reagiert Phosvitin mit Polylysin. Phosvitin kann in viel geringerer als der stöchiometrischen Menge mit DNS um Polylysin konkurrieren, also DNS freisetzen und als Matrize für die RNS-Synthese verfügbar machen. Phosphoserin ist, im Gegensatz zu Phosvitin, unwirksam bei der Aufhebung des Hemmungseffektes von Polylysin.
    Notes: DNA dependent RNA asynthesis in inhibited by basic proteins like histones or polylysine This inhibitory effect is found to be suppressed by phosvitin, which is a phosphoprotein. Turbidometric studies indicate that polylysine interacts with DNA and RNA stoichiometrically. This interaction with DNA has been thought to be the cause of this inhibitory effect. Phovitin also interacts with polylysine more effectively than DNA. Phosvitin in quantities much less than the stoichionietric amount can compete with DNA for the polylysine and can thus make DNA free and available as template for the RNA synthesis. Phosphoserine, unlike pbosvitin, is ineffective in suppressing the inhibitory effect of polylysine.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021240112
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  • 9
    Electronic Resource
    Electronic Resource
    Rapid analysis of some coinage, jewellery, aluminium bronze and ternary alloys by the ring oven technique (1965)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 28 (1965), S. 137-140 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Schemes have been worked out for the quantitative separation and subsequent determination of the constituents in a number of alloys containing Au—Cu, Cu—Al, Fe—Au and Fe—Cu—Al by the ring oven technique. Gold is migrated to the ring zone by extraction with n-butanol at pH = 1.5 and iron or copper with acetylacetone. Aluminium is moved to the ring zone by acidified ethanol.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19650280306
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  • 10
    Electronic Resource
    Electronic Resource
    Redox-initiated vinyl polymerization with thiourea as the reductant (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 135-149 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A few redox systems containing thiourea as reductant have been found to be quite effective in initiating vinyl polymerization in aqueous media and polymers obtained in the process have all been found to contain amino endgroups to various extents by the application of dye techniques. Quite a few oxidants have so far been utilized for this purpose; among them are ferric chloride (Fe3+), ethylene dibiguanide complex salts of tripositive silver (Ag3+), hydrogen peroxide (H2O2), persulfate (S2O82-), bromate (BrO3-) + hydrochloric acid (HCl). In case of oxidants Fe3+ and Ag3+, amino endgroups are mainly incorporated in polymers; but in case of oxidants H2O2 and S2O82-, fragments of oxidants are also incorporated as hydroxyl and sulfate endgroups. BrO3-, however, forms a very efficient redox-initiating system with thiourea, as is evidenced by its capability of polymerizing even hydroquinone-stabilized water-soluble vinyl monomers at very low temperature (∼0°C.) and at a quite rapid rate. Besides amino endgroups, sulfonate endgroups have also been detected in polymers in this case, and the relative extents of these two types of endgroups depend generally on the acid concentration of the system. Evidences so far collected indicate the generation of S—C(=NH)NH2 radicals in the system by oxidation of isothiourea, HS—C(=NH)NH2, and these are incorporated in polymers as endgroups. Sulfonate endgroups may be generated by oxidation of these amino-bearing endgroups. Suitable initiation mechanisms have been suggested in each case.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050112
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