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  • Chemistry  (366)
  • 1990-1994  (268)
  • 1965-1969  (98)
  • 1940-1944
  • 1994  (268)
  • 1969  (98)
  • 1898
Collection
Keywords
Publisher
Years
  • 1990-1994  (268)
  • 1965-1969  (98)
  • 1940-1944
  • 1890-1899  (6)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Surface acoustic wave resonance spectroscopy (SAWRS) as a novel technique to study surface phenomena (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 585-589 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A new method is proposed for investigating surface phenomena based on the observation of the acoustic vibration modes of surface structures at high resolution. Experimental SAWR spectra can be obtained under a narrow frequency band excitation (Δω/ω ∼ 10-5) in a wide range (100 kHz-10 MHz). Application of this method to Ag(111) and Pt(100) single crystals reveals the existence of very narrow resonant acoustic vibration modes with Δω/ω ∼ 10-3-10-4 demonstrating strong anomalies in the phonon energy distribution function of solids. The behaviour of these anomalous peaks is very sensitive to surface structure and to the presence of adsorbates.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7402201124
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  • 2
    Electronic Resource
    Electronic Resource
    Melting of the left-handed helical conformation of charged poly-L-lysine (1994)
    New York : Wiley-Blackwell
    Biopolymers 34 (1994), S. 1123-1124 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360340816
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  • 3
    Electronic Resource
    Electronic Resource
    Electron-beam-pumped laser emitters with microrelief mirrors based on II-VI semiconductorsPresented at European II-VI Workshop, Aachen, 1993. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 4 (1994), S. 365-371 
    Details
    ISSN: 1057-9257
    Keywords: II-VI semiconductor ; Laser ; Generation ; Longitudinal electron beam pumping ; Microrelief ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The power characteristics of electron-beam-pumped emitters based on II-VI compounds have been stukdied. The use of a microrelief with direction-selective reflective properties instead of a totally reflecting miror has made it possible to provide effective sukppression of closed non-characteristics and efficiency of lasers and to make them suitable for obtaining generation with high efficiency in a number of media, in particular YAG:Nd3+, KGW:Nd3+ and Lif:F2+ (OH), at room temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860040508
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  • 4
    Electronic Resource
    Electronic Resource
    Polymers and copolymers based on vinyl tetrazoles, 2Part 1 cf.10.. Alkylation of poly(5-vinyl tetrazole) (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 219 (1994), S. 89-99 
    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: Die Alkylierung von Poly(5-vinyltetrazol) mit Dimethylsulfat und tert-Butylalkohol sowie Alkylhalogeniden RHal (R=CH3, C2H5, CH2—CH=CH2, n-C4H9 und t-C4H9) und die Kinetik dieser Reaktion wurden untersucht, um eine neue Herstellungsmethode für tetrazolhaltige Polymere mit wertvollen Eigenschaften zu entwickeln. Die vergleichenden Untersuchungen über die isomere Zusammensetzung und die spektroskopischen Daten von Poly(N-alkyl-5-vinyltetrazol)en, die durch die Alkylierung von Poly(5-vinyltetrazol) sowie durch die Copolymerisation der entsprechenden Monomeren hergestellt wurden, wurden mit IR-, 1H-NMR- und 13C-NMR-Spektroskopie durchgeführt. Der Alkylierungsumsatz beträgt bis zu 99,8%; dadurch können polymere Produkte erhalten werden, deren Zusammensetzung, Struktur und Eigenschaften denen der Homo- und Copolymeren sehr ähnlich sind.
    Notes: Alkylation of poly(5-vinyl tetrazole) with dimethyl sulfate and tert-butyl alcohol as well as with alkyl halides RHal (R=CH3, C2H5, CH2—CH=CH2, n-C4H9, t-C4H9) has been studied under various conditions in order to develop a new method of synthesis of tetrazole-containing polymers having a complex of valuable properties. The kinetic study of the process and comparison of isomeric compositions and spectroscopic characteristics (IR, 1H NMR and 13C NMR) of poly(N-alkyl-5-vinyl tetrazole)s synthesized by alkylation of poly(5-vinyl tetrazole) and of those prepared by (co)polymerization of the corresponding vinyl tetrazoles have been carried out. The alkylation is found to proceed to high conversion extents (up to 99.8%) and enables to obtain a wide variety of polymeric products having the composition, structure and properties very similar to those of homo- and copolymers.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052190108
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  • 5
    Electronic Resource
    Electronic Resource
    Electroinitiated polymerization of some new monomers with schiff's base structure and pyrrole moieties (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 221 (1994), S. 103-115 
    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: Monomere mit Pyrrol-Einheiten und dem Strukturelement der Schiffschen Basen wurden durch elektrochemische Oxidation bei gleichzeitiger Fällungspolymerisation in 1,2-Dichlorethan oder Acetonitril hergestellt. Als Monomere wurden Pyrrol-2-aldehydazin, N,N'-bis(2-pyrrolylmethylen)-1,4-diaminobenzol bzw. N,N'-bis(2-pyrrolylmethylen)-4,4′-diaminobiphenyl und als Elektrolyte Tetrabutylammoniumperchlorat, Tetrabutylammoniumtetrafluoroborat sowie Natrium-p-toluolsulfonat eingesetzt. Die dotierten Polymeren wurden mittels Elementaranalyse, IR-Spektroskopie und Thermoanalyse charakterisiert.
    Notes: Pyrrole-2-aldehyd azine, N,N'-bis(2-pyrrolylmethylene)-1,4-diaminobenzene and N,N'-bis(2-pyrrolylmethylene)-4,4′-diaminobiphenyl were polymerized by electro-chemical precipitating oxidation reaction in 1,2-dichloroethane and acetonitrile, respectively, in the presence of electrolytes like tetrabutylammonium perchlorate, tetrabutylammonium tetrafluoroborate and sodium p-toluene sulfonate. The doped resulted polymers were characterized by elemental analysis, IR spectroscopy and thermal analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052210109
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Reaktion von Ketiminen mit Phosgen (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2972-2976 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Am Stickstoff nicht substituierte Ketimine reagieren mit Phosgen zu N-Chlorcarbonyl ketiminen (1), die mit α-Chlor-alkylisocyanaten im Gleichgewicht stehen. Die Umsetzung von 1 mit Alkoholen und primären Aminen führt zu den Verbindungen 3-6, Derivaten der zwei tautomeren Formen. N-Fluorcarbonyl-ketimine liegen nach IR-und 19F-NMR-Spektren vollständig in der Struktur 2 vor, reagieren aber mit primären Aminen zu Derivaten beider Tautomeren.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691020912
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  • 7
    Electronic Resource
    Electronic Resource
    Increased oxygen mass transfer rates from single bubbles in microbial systems at low reynolds numbers (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 11 (1969), S. 647-681 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The presence of microorganisms have been shown to increase by over 40% the mass transfer rates from small oxygen bubbles at low Reynolds number flow. This increase was found to be due only to the microbe cells as inert particles disrupting the quasi-static liquid surface film surrounding the gas bubble and thus decreasing the gas-liquid interfacial resistance. The observed increase in oxygen mass transfer rates was not dependent on cell viability, no effect was noted due to cell-liquid interfacial resistance, nor was the phenomenon due to altering the physical properties of the liquid during cell propagation. These results were obtained in a unique plexiglass apparatus designed for observing under a microscope a small (0.4 mm dia.) stationary oxygen bubble collapsing into a flowing fluid. The oxygen bubble was injected by a small hypodermic needle and the fluid was suspensions of the yeast Candida intermedia, the bacterium Pseudomonas ovalis, 0.3μ alumina, as well as base points of cell free broth and pure water. Several well-known chemical inhibitors of oxidative phosphorylation were used to limit cell oxygen uptake. Calculations of oxygen mass transfer rates were compared with the semi-empirical model of Frössling, the circulating sphere model of Levich, and the rigid sphere concentration boundary layer model of Fried-lander, the latter two showing strong Reynolds number dependence that may be due to radial fluid motion.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260110411
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of heat evolution and correlation with oxygen consumption during microbial growthThis paper was presented in part at the 154th Meeting of the American Chemical Society, Chicago, III., Sept. 11, 1967. (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 11 (1969), S. 269-281 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A procedure for measuring the rate of heat production from a fermentation has been developed. The method is based on measuring the rate of temperature rise of the fermentation broth resulting from metabolism, when the temperature controller is turned off. The heat accumulation measured in this manner is then corrected for heat losses and gains. A sensitive thermistor is used to follow the temperature rise with time. This procedure is shown to be as accurate as previous methods but much simpler in execution. Using this technique, the rate of heat production during metabolism was found to correlate with the rate of oxygen consumption. Experiments were performed using bacteria (E. coli and B. subtilis), a yeast (C. intermedia), and a mold (A. niger). The substrates investigated included glucose, molasses, and soy bean meal. The proportionality constant for the correlation is independent of the growth rate, slightly dependent on the substrate, and possibly dependent On the type of organism growth. This correlation has considerable potential for predicting heat evolution from the metabolism of microorganisms on simple or complex substrates and providing quantitative parameters necessary for heat removal calculations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260110302
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  • 9
    Electronic Resource
    Electronic Resource
    Chiral discrimination in nonracemic mixtures of methanephosphonic acid, N,N′-bis(1-phenylethyl)diamides (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 6 (1994), S. 1-4 
    Details
    ISSN: 0899-0042
    Keywords: methanephosphonic acid dichloride ; N,N′-bis(1-phenylethyl)diamidomethylphosphonate ; chiral discrimination on self-association ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enantiomeric (S,S)- and (R,R)-bis(1-phenylethyl)diamidomethylphosphonates, the phosphorus atom being prochiral, have been synthesized, starting from the methanephosphonic acid dichloride and corresponding chiral amines. The splitting observed in the 31P-NMR spectra of their nonracemic mixtures may be accounted for the self-discrimination of chiral species. This effect can be very useful for enantiomeric analysis of amines based on coupling reactions with methanephosphonic acid dichloride. © 1994 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530060103
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  • 10
    Electronic Resource
    Electronic Resource
    Neue stationäre Phase für die Chromatographie (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 81 (1969), S. 464-464 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19690811205
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