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  • 1
    Series available for loan
    Series available for loan
    List of serials held in the Geological Survey of Canada library : 1982 (1983)
    Ottawa : Geological Survey of Canada
    Associated volumes
    Details Availability
    Call number: SR 90.0008(83-17)
    In: Paper
    Type of Medium: Series available for loan
    Pages: 193 S.
    ISBN: 0660521741
    Series Statement: Paper / Geological Survey of Canada 83-17
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Fly photoreceptor fluorescence is related to UV sensitivity (1979)
    [s.l.] : Nature Publishing Group
    Nature 280 (1979), S. 581-583 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 UV-induced fluorescence photographed in the deep pseudopupil of the compound eye of completely intact and living white-eyed Drosophila (mutants cinnabar (en) and brown (6vv)), reared on diets high (a) and low (b) in vitamin A. In flies the rhabdomeres, which are the photopigment containing ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/280581a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vitamin A deprivation and Drosophila photopigments (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 648-650 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] D. melanogaster (Canton-Special strain) were deprived of vitamin A by raising sterilised eggs on Sang's synthetic medium C (ref. 10) ; control flies were reared identically except that -carotene 1.25 mg ml-1 was added to the medium. White-eyed mutants (w) were employed in some experiments to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266648a0
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  • 4
    Electronic Resource
    Electronic Resource
    Photoreceptor properties of an ectopic eye in the fleshfly,Sarcophaga bullata (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 993-994 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ectopic eyes were produced on the fleshfly,Sarcophaga bullata by transplantation of imaginal eye discs. Electrophysiological and histological observations of these supernumerary eyes indicate the absence of synaptic connections between retinular cells and higher order neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01953841
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  • 5
    Electronic Resource
    Electronic Resource
    Development of visual sensitivity in the fly,Sarcophaga bullata (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 1318-1319 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ontogeny of light response in the compound eyes of the fly,Sarcophaga bullata was investigated. Even though the eyes are structurally differentiated before eclosion they become electrophysiologically functional only after eclosion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990392
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  • 6
    Electronic Resource
    Electronic Resource
    Photopigment and receptor properties in Drosophila compound eye and ocellar receptors (1979)
    Springer
    European biophysics journal 5 (1979), S. 197-209 
    Details
    ISSN: 1432-1017
    Keywords: Visual pigments ; Invertebrate neurobiology ; Membrane biophysics ; Retina
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract A review of the spectral sensitivity and the rhodopsin and metarhodopsin characteristics in three compound eye receptor types (R1–6, R7, and R8) and ocellar receptors is presented (Fig. 1). Photopigment properties were determined from measures of conversion efficiency. The photopigments of R1–6 were studied using in vivo microspectrophotometry in the deep pseudopupil of white-eyed flies. These studies yielded a refined estimate of the R1–6 metarhodopsin spectrum (Fig. 2). The quantum efficiency relative to the spectral sensitivity estimate of the rhodopsin spectrum was factored out. The quantum efficiency of rhodopsin is about 1.75 times that of metarhodopsin. The peak absorbance of metarhodopsin was estimated to be about 2.6 times that of rhodopsin. The mechanism of the two-peaked R1–6 spectral sensitivity and metarhodopsin spectrum is discussed in terms of evidence that there is only one rhodopsin in R1–6 and that vitamin A deprivation preferentially lowers ultraviolet sensitivity. The prolonged depolarizing afterpotential is reviewed from the standpoint of the internal transmitter hypothesis of visual excitation. A careful comparison of the intensity-responsivity for photopigment conversion and its adaptional consequences is made (Fig. 3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535448
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  • 7
    Electronic Resource
    Electronic Resource
    Studies of fluorescence inDrosophila compound eyes: changes induced by intense light and vitamin A deprivation (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 297-305 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultraviolet light excites a red fluorescence fromDrosophila R1–6 rhabdomeres which is superimposed on a blue background emission. Metarhodopsin (M570) pigment generates some or all of the vitamin A dependent red emission. However, the excitation spectrum for red emission peaks in the UV. This suggests that the pigment which sensitizes R1–6's visual pigment to UV light (sensitizing pigment) absorbs the UV light, sensitizing metarhodopsin's fluorescence by energy transfer. Blue emission is neither from sensitizing pigment nor from visual pigment as shown by vitamin A deprivation studies. Very intense UV or blue stimulation causes these changes: (1) conversion of visual pigment into a fluorescent product; (2) destruction of this fluorescent product; (3) a decrease in the blue background fluorescence (even in vitamin A deprived flies); and (4) a permanent destruction of visual pigment and retinal degeneration. The first effect requires intensities 3 log units brighter than needed to interconvert rhodopsin and metarhodopsin 1/2 way to photoequilibrium. UV light is about 5 times as effective as blue light for the conversion of visual pigment into fluorescent product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604996
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  • 8
    Electronic Resource
    Electronic Resource
    A glimpse into the paradise of combinatory algebra (1984)
    Springer
    International journal of parallel programming 13 (1984), S. 219-236 
    Details
    ISSN: 1573-7640
    Keywords: Algebra ; terms ; syntax ; semantics ; fixed-point ; finite state automata ; recursion ; functional language
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This expository paper examines combinatory algebra and the lambda calculus as foundations for functional languages (LISP, FP, KRC, etc.,). The basic notions are defined and numerous examples are given. Historical comments and references are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00979873
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  • 9
    Electronic Resource
    Electronic Resource
    Zum Einfluß von Oberflächenverunreinigungen auf den Ladungsabbau bei FEP-Elektreten (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 9-13 
    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: The influence of surface contaminations on isothermal charge decay of electrets of (tetrafluoroethylene-hexafluoropropylene) copolymer was investigated. Carefully rinsed samples showed increased charge stability in comparison with not treated or open stored samples. The results are explained by the partial destruction of the isolating properties of FEP by dust particles.
    Notes: Der Einfluß von Oberflächenverunreinigungen auf den isothermen Ladungsabbau bei Elektreten aus Tetrafluorethylen-Hexafluorpropylen-Copolymer (FEP) wird untersucht. An sorgfältig gespülten Proben ist eine deutliche Erhöhung der Ladungsstabilität im Vergleich zu unbehandelten bzw. offen gelagerten Proben zu beobachten. Die Ergebnisse werden mit der teilweisen Zerstörung der Isolationseigenschaften des FEP durch eindringende Staubpartikel in Verbindung gebracht.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330102
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  • 10
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    Photopigment and receptor properties in Drosophila compound eye and ocellar receptors (1979)
    Springer
    Details
    Publication Date: 1979-01-01
    Print ISSN: 0175-7571
    Electronic ISSN: 1432-1017
    Topics: Biology , Physics
    Published by Springer
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