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  • 1
    Electronic Resource
    Electronic Resource
    Visual and vestibular signals in the lateral mesencephalic tegmental region of the cat (1991)
    Springer
    Experimental brain research 85 (1991), S. 641-649 
    Details
    ISSN: 1432-1106
    Keywords: Lateral mesencephalic tegmental region ; Brain stem ; Visual responses ; Vestibular responses ; Auditory responses ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single unit recordings from two alert cats were used in an attempt to further elucidate the function of the lateral mesencephalic tegmental region (LTR), a part of the mesencephalon forming a link between the superior colliculus and the lower brain stem. A total of 155 units recorded from the LTR were tested with visual, vestibular and acoustic stimuli. Of these, 54 cells (36%) were characterized as either visually (n=33) or vestibularly (n=21) responsive and an additional 13 cells were driven by complex acoustic stimuli. Visually responsive cells typically were directionally selective with large, mainly contralateral receptive fields. Vestibularly responsive cells were modulated by stimulation of either the horizontal canals (yaw stimulation; n = 16) or of both pairs of vertical canals (pitch stimulation; n=5). About half of the cells with activity modulated by rotation about the yaw axis increased discharge during ipsiversive (Type I), the other half during contraversive rotation (Type II). Of the 5 cells with activity modulated by pitch stimulation, 4 preferred the nose-down and only 1 the nose-up direction. Although the discharge of units responsive to yaw stimulation was roughly in phase with head velocity (mean phase lag with respect to head velocity: 10.6 deg), none of the vestibular cells had activity correlated with eye position, eye velocity or movement of visual stimuli. Our observations suggest that the LTR might introduce visual and vestibular signals into the tecto-facial pathway which may be used to adjust the size of pinna movements with respect to the size of ongoing head- or body movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231750
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of rape seed cultivars (Brassica napus) by starch gel electrophoresis of enzymes (1990)
    Springer
    Euphytica 45 (1990), S. 179-187 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; rape seed cultivars ; isozyme variation ; variety identification ; partial outcrossing species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Isozyme patterns were used to characterize ten commercial rape seed (Brassica napus) cultivars. Extracts of cotyledons were made 4–7 days after germination and separated by electrophoresis on starch gels. A sample of more than 100 plants of each variety was analysed and stained for 4 polymorphic enzyme loci (Lap, Gpi, Acon, and Sdh). Therewith, it was possible to distinguish all ten rape varieties qualitatively by at least one typical enzyme pattern. Further, it could be demonstrated that all pairs of varieties showed clear qualitative differences in isozyme patterns, when only tow loci were screened (Acon, Sdh). Using χ2 test of homogeneity all pairs of varieties differ significantly in their frequencies of isozyme patterns for Acon and in all but one for Sdh.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033284
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    Paper (German National Licenses)
    Fulltext
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