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  • 65.70.+y  (1)
  • Biodiesel  (1)
  • Classification tectum cells  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Responses in the optic tectum of the salamanderHydromantes italicus to moving prey stimuli (1982)
    Springer
    Experimental brain research 45 (1982), S. 386-392 
    Details
    ISSN: 1432-1106
    Keywords: Salamander optic tectum ; Stimulus velocity ; Classification tectum cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the tectum opticum ofHydromantes italicus neurons were recorded extracellularly which responded selectively to moving visual stimuli. Part of the recorded cells were marked iontophoretically by means of alcian-blue dye for anatomical localization. Out of a total of 110 neurons six groups could be distinguished which preferred the square stimulus but differred strongly in their responses to rectangles oriented either vertically or horizontally. Two of these groups showed stimulus preference inversion if the stimulus velocity was changed. These response patterns displayed characteristic differences with those known in other amphibia, well corresponding to differences in the prey catching behaviours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208598
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phase transition at 240 K in C70 single crystal (1993)
    Springer
    Applied physics 56 (1993), S. 227-229 
    Details
    ISSN: 1432-0630
    Keywords: 31.70.Ks ; 64.70.Pf ; 65.70.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The thermal expansion of single- and polycrystalline C70 is studied between 5 and 315K using an ultrahigh-resolution capacitance dilatometer. We observe a first-order phase transition in single crystalline C70 at ≈240K and a transition at ≈280K in polycrystalline C70. X-ray diffraction measurements at 300K show that the C70 single crystal has fcc symmetry, whereas the polycrystalline sample is multiphase (fcc and hcp). The results are compared to thermal expansion measurements of solid C60.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539479
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous gas chromatographic determination of methanol and free glycerol in biodiesel (1996)
    Springer
    Chromatographia 42 (1996), S. 431-434 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Fatty acid methyl esters ; Biodiesel ; Methanol ; Glycerol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The methanol and free glycerol content of vegetable oil methyl esters used as diesel fuel (biodiesel) is very important in describing the quality of this fuel and is therefore limited by specifications. A previously described GLC method for the determination of free glycerol in biodiesel has been further developed and also allows the simultaneous determination of methanol. Sample preparation includes dissolving in dimethylformamide, silylation with bis-trimethylsilyltrifluoracetamide (BSTFA) and separation on a methylsilicone fluid, coated-capillary column using either FID or MS-detection. Ethanol and 1,4-butanediol were used as internal standards. Both detection systems show sufficient sensitivity for concentrations relevant to biodiesel samples. The recovery was tested using a RME-sample containing known amounts of methanol and glycerol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272135
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    Paper (German National Licenses)
    Fulltext
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