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  • 1
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    Kainic acid induces sprouting of retinal neurons (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-02-03
    Description: The neurotoxin kainic acid caused dose-dependent morphological changes in horizontal cells of the retinas of adult cats and rabbits. High concentrations of kainic acid killed the cells, but when exposed to sublethal doses they contracted their dendritic fields and sent sprouting processes into the inner retina. It appears that kainic acid can induce neuronal growth as well as degeneration and that the potential for morphological plasticity is still present in neurons of the adult mammalian retina.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peichl, L -- Bolz, J -- New York, N.Y. -- Science. 1984 Feb 3;223(4635):503-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6691162" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cats ; Dendrites/ultrastructure ; Dose-Response Relationship, Drug ; Kainic Acid/*pharmacology ; Nerve Degeneration/drug effects ; Neurons/cytology/*drug effects ; Pyrrolidines/*pharmacology ; Rabbits ; Retina/cytology/*drug effects
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Update of a classic (2019)
    Springer Nature
    Details
    Publication Date: 2019
    Print ISSN: 1018-4813
    Electronic ISSN: 1476-5438
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 3
    Electronic Resource
    Electronic Resource
    Head movements of the mealworm beetle Tenebrio molitor (1980)
    Springer
    Biological cybernetics 36 (1980), S. 109-115 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract In the imagines of the mealworm Tenebrio molitor vigorous head movements during walk have been observed. This head waving is absent in resting animals. The time course of the head movement in the horizontal plane of the tethered animals was registered by means of a television camera and its power spectrum, autocorrelation function as well as the distribution of the head's angular position have been calculated. In non-homogeneous stationary panoramas, which are symmetrical with respect to the body axis the process governing the head waving is quasi-Gaussian, its power spectrum is a slowly declining exponential function of the frequency. In asymmetrical panoramas the distribution of the angular position of the head becomes also asymmetrical, and its average value is shifted with respect to the body axis. In homogeneously bright surroundings the process is the superposition of a quasi Gaussian and of a symmetrical periodic function, thus indicating a regular searching movement in addition to the random head waving. The possible role of the head waving for the fixation response is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361079
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  • 4
    Electronic Resource
    Electronic Resource
    Interferometry of pions and kaons in high energy collisions
    Amsterdam : Elsevier
    Physics Letters B 300 (1993), S. 404-409 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(93)91354-P
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  • 5
    Electronic Resource
    Electronic Resource
    Head movements of the mealworm beetle Tenebrio molitor (1980)
    Springer
    Biological cybernetics 36 (1980), S. 117-124 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Tethered walking imagines of the mealworm beetle Tenebrio molitor wave their heads in random fashion. If a periodic pattern of vertical black and white stripes is rotated around the animal a regular nystagmic head movement is superimposed upon the random waving, the frequency of the latter equals the contrast frequency within large ranges of the angular velocity of the pattern. The nystagmus is inverted: After a short period of tracking, during which the angular velocity of the head is the same as that of the panorama, the head returns slowly toward its normal position according to an exponential-like function. Resting animals do not wave their heads. However, if the above panorama is rotated, the beetle turns its head in the direction of the movement of the panorama and holds it in a side-way position, as long as the rotation is maintained. The angular position reached depends in the same manner on the angular velocity of the panorama as the turning tendency of walking animals established in open loop experiments using the spherical Y-maze method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361080
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  • 6
    Electronic Resource
    Electronic Resource
    On the visually evoked head nystagmus of Tenebrio molitor and other beetles (1981)
    Springer
    Biological cybernetics 41 (1981), S. 1-3 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Head movements of different species of walking beetles elicited by rotating stripe patterns have been investigated. They are of the usual type in contrast to an “inverted nystagmus” reported forTenebrio molitor in similar experimental situations. Reexamination of theTenebrio records revealed that the sign of the stimulus was interchanged by a mistake while plotting the results. Thus, the head nystagmus inTenebrio is also of the usual type, consisting of a smooth pursuit head movement followed by a faster returning phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01836122
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  • 7
    Electronic Resource
    Electronic Resource
    Substance P-immunoreactive retinal ganglion cells and their central axon terminals in the rabbit (1987)
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 155-158 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] New Zealand and Dutch Belted rabbits (not operated upon or surviving 3-143 days after unilateral optic nerve section or eye enucleation) were used. Most received an intraocular injection of colchicine, which is known to increase peptide levels in neuronal cell bodies4. Some received a unilateral ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/327155a0
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer effect in superconducting tin-europium-molybdenum-sulfides (1976)
    Springer
    The European physical journal 25 (1976), S. 351-357 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of119Sn in Sn1−z Eu z Mo6S8 (z=0, 1/3, 2/3) have been measured in the temperature range 4.9 K≦T≦293 K. The spectra consist of a quadrupole doublett with unequal intensities at all temperatures. The Debye-Waller factor, the isomeric shift and the asymmetry of the intensity of the quadrupole components show irregularities between 50 K and 110 K which are interpreted as arising from a structural phase transition. The temperature dependence of the Debye-Waller factor can be approximated by a simple phonon spectrum. No quantitative explanation can be given for the large values of the asymmetry. Evidence is presented that this behavior is connected with the properties of the librational modes of the Mo6S8-units in the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315250
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  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer effect of119Sn in amorphous superconducting metals (1975)
    Springer
    The European physical journal 20 (1975), S. 95-103 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra for119Sn in crystalline and disordered Sn, as well as in crystalline and liquid-like amorphous Sn1-x Cu x (X=0.10−0.18), have been measured at 2.6 K≦T≦108 K. The Debye-Waller-Factor (DWF) obtained from the spectra is identical for the crystalline and for the disordered phase. The DWF of the amorphous phase is smaller than the DWF of the crystalline phase athigh temperatures, but it shows a stronger temperature dependence than the DWF of the crystalline phase and reaches the latter one at about 4 K. From this low-temperature result we conclude that the differences of the Eliashberg functionα 2(ω)F(ω) and of the superconducting transition temperatureT c in these two phases cannot be related to changes in the phonon spectrumF(ω), but must result from changes of the interaction parameterα 2 (ω). A comparison between DWF,α 2 F, and specific heat data is performed. From the values for the isomeric shift of the Mössbauer line we can show that the hybridisation and covalency of the electronic bonds present in the crystalline and in the disordered phases are destroyed in the amorphous phase. Both, the DWF and the isomer shift demonstrate that the electronic properties of crystalline and amorphous Sn(Cu) differ appreciably. The electronic and superconducting properties of amorphous Sn(Cu) are similar to the properties of the high pressure phase of tin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313918
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  • 10
    Electronic Resource
    Electronic Resource
    I=0 toI=1 transition form factors (1994)
    Springer
    The European physical journal 350 (1994), S. 145-159 
    Details
    ISSN: 1434-601X
    Keywords: 13.40.Fn ; 12.38.Bx ; 14.20.Gk ; 14.40.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method is proposed to extend the hard scattering picture of Brodsky and Lepage to transitions between hadrons with orbital angular momentuml=0 andl=1. The use of covariant spin wave functions turns out to be very helpful in formulating that method. As a first application we construct a light-cone wave function of the nucleon resonance N*(1535) in the quark-diquark picture. Using this wave function and the extended hard scattering picture, theN-N * transition form factors are calculated at large momentum transfer and the results compared to experimental data. As a further application of our method we briefly discuss theπ- a1 form factors in an appendix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290682
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