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  • Articles  (9,713)
  • 2020-2023
  • 2010-2014
  • 1970-1974
  • 1965-1969  (9,713)
  • 1960-1964
  • 1945-1949
  • 1935-1939
  • 1968  (9,713)
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  • 2020-2023
  • 2010-2014
  • 1970-1974
  • 1965-1969  (9,713)
  • 1960-1964
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  • 1
    Electronic Resource
    Electronic Resource
    Reduction of some sulfonium salts with lithium aluminum hydride (1968)
    s.l. : American Chemical Society
    The @journal of organic chemistry 33 (1968), S. 2526-2528 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01270a083
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  • 2
    Electronic Resource
    Electronic Resource
    Stirred Reactor with Porous Catalyst Wall (1968)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 7 (1968), S. 261-265 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i260026a018
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  • 3
    Electronic Resource
    Electronic Resource
    Attenuation in the Chest Wall of 20 keV X-rays from an Inhaled Radioactive Aerosol (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 642-643 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] There are now techniques for the preparation of mono-disperse aerosols of polystyrene particles, labelled with radio-nuclides, and suitable for inhalation by volunteers3. This has made it possible to study the plutonium calibration problem in vivo., using radio-nuclides which decay by orbital ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217642b0
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  • 4
    Electronic Resource
    Electronic Resource
    Micro-phase titrations (1968)
    Springer
    Microchimica acta 56 (1968), S. 722-728 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Mikroverfahren zur Phasentitration wurde beschrieben. Man kann mit 0,1 ml Untersuchungslösung auskommen. Die Ergebnisse für 141 synthetische Gemische aus Äthanol und verschiedenen Geschmacks- und Geruchsstoffen (ätherischen Ölen) wurden mitgeteilt.
    Notes: Summary A micromethod for phase titration is described. The volume of solution used in the titration may be as little as 0.1 ml. Results for phase titrations of 141 synthetic mixtures containing ethanol and a variety of artificial flavoring and perfuming agents are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01216911
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  • 5
    Electronic Resource
    Electronic Resource
    Lysis of cell walls ofMucor ramannianus möller by aStreptomyces sp. (1968)
    Springer
    Antonie van Leeuwenhoek 34 (1968), S. 173-182 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study has been made of some chemical and ultrastructural changes that occur in the hyphal, arthrospore and sporangiospore walls ofMucor ramannianus during lysis by a soil streptomycete. Arthrospore and hyphal walls, which were shown to contain chitin, chitosan, other polysaccharides and phosphate (principally as polyphosphate), were lysed by culture fluid of the streptomycete after this organism had been grown on the same material. Alcohol-insoluble material found in the supernatants of the incubation mixtures gave on hydrolysis glucosamine, galactose, mannose and fucose. No laminarinase activity was detected in these culture fluids. Culture fluids of the streptomycete after growth on chitin and chitosan were also found to lyse the walls of arthrospores and hyphae. Despite the chemical similarities the walls were very different in thin section. A major component in the sporangiospore walls was glucan and an active laminarinase was shown to be present in the culture fluids of the streptomycete after growth on them. Further, ultrathin sections showed that an inner fibrillar layer of the sporangiospore wall was lysed leaving an outer electron-dense layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02046428
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  • 6
    Electronic Resource
    Electronic Resource
    Moving Particles in Intact Sieve Tubes of Heracleum mantegazzianum (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 531-532 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In this study we have been able to isolate living phloem tissue from the petioles of the umbellifer Heracleum mantegazzianum Somm. et Lev. grown in pots for ease of handling in the laboratory. Phloem bundles were dissected apart while remaining attached to the intact plant, a technique pioneered by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/219531a0
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of hydrofluorides of the alkaline earth metals by the NMR method (1968)
    Springer
    Journal of structural chemistry 9 (1968), S. 149-152 
    Details
    ISSN: 1573-8779
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The structure of hydrofluorides with the composition MeF2 · HF(Me=Sr, Ba) includes two anions: F− and HF2 − with a linear hydrogen bond. In SrF2 · HF, the hydrogen bond is characterized by a more asymmetrical position of the proton than in BaF2 · HF. Increasing the number of added HF molecules leads to the formation of two bifluoride ions in the compounds CaF2 · 2HF and SrF2 · 2.5HF. The hydrogen bond in this case is also nonsymmetrical, and the average F−H distance is equal to 1.17 A. Thus, the hydrogen bond in these compounds is of the same order as in KF · 2HF (rF−F=2.33 A) [12],i.e., weaker than in KF · HF (rF−F=2.26 A) [13], but stronger than in solid HF (rF−F=2.49 A) [14]. A structure with two polyfluoride anions evidently corresponds to the compound BaF2 · 3HF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00743489
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  • 8
    Electronic Resource
    Electronic Resource
    Diversity in germination of seeds inCalotropis procera R.Br. population (1968)
    Springer
    Plant systematics and evolution 115 (1968), S. 6-17 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phenotypically there appeared to exist no diversity in different individual plants in a population ofCalotropis procera. The diversity in imbibition and germination behaviour of seeds from different plants was revealed only after detailed studies were undertaken. Seeds from six individual plants were collected and stored separately for a period of two years. Ordinarily the seeds of this species did not exhibit any dormancy and were found to germinate immediately after harvest. Two years old seeds did not loose their viability in any of the six lots indicated above. It was discovered that the weight and size of seeds, the rate of imbibition of water, the amount of water imbibed, the loss of water upon drying, the rate of germination, the percentage of germination, and the germination behaviour in continuous illumination and total darkness, all exhibited diversity to some extent in the six lots studied. It was evident that there did not exist seeds exhibiting homogeneous behaviour in a population ofCalotropis procera.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373524
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  • 9
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1968)
    Springer
    Colloid & polymer science 226 (1968), S. 163-180 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02086262
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of photoelastic properties of crosslinked amorphous polyethylenes (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1183-1202 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Crosslinked samples of polyethylene were prepared by electron irradiation of both high- and low-density polymers in the crystalline state. A further crosslinked sample was obtained by curing a high-density polyethylene by reaction with dicumyl peroxide at 180°C. The stress-strain-birefringenece relations were obtained on specimens cut from these samples at temperatures between 130 and 250°C. All samples showed a substantial decrease in stress-optical coefficient with increasing degree of crosslinking and with increasing temperature. The stress-optical properties at each temperature were extrapolated to zero degree of crosslinking to give quantities characteristic of the Gaussian network. Comparison of these properties with the theory of networks of rotational isomeric chains with both independent and interdependent rotation allows estimates to be obtained for (1) the trans-gauche energy differences in rotation around skeletal bonds and (2) the difference in principal optical polarizabilities for the CH2 group in the elastomeric state. This latter quantity is shown to be more nearly given by Denbigh's than by Bunn and Daubeny's bond polarizability values.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060611
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