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  • 1
    Electronic Resource
    Electronic Resource
    Effects of patterned backgrounds on responses of lateral geniculate neurons in cat (1987)
    Springer
    Experimental brain research 67 (1987), S. 16-26 
    Details
    ISSN: 1432-1106
    Keywords: Lateral geniculate nucleus ; Single neurons ; Receptive field ; Patterned background ; Summation ; Disinhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the lateral geniculate nucleus (LGN) of paralyzed cats under urethane anaesthesia, an extensive disinhibitory region (DIR) outside the inhibitory surround of the receptive field (RF) was found in both sustained and transient cells. Its extent is comparable to that of McIlwain's periphery effect (1964). The responses to a light spot, flashed into different parts of the RF center, were used to assess the effect of different background patterns, located over the DIR, on responsiveness and receptive field organization. A straight line background cutting across the RF center led to a marked shrinkage in RF size and to a suppression of the center response. In sustained cells, these influences were not due to the light flux of the background, but were mainly due to the spatial property of the line itself. This was demonstrated by comparing the effect of a straight line background with that of a zigzag line or of distributed dots. The light flux for the different patterns and their spatial weighting was the same, so that they differed from each other solely in their form. A straight line background elicited much stronger suppression of the center response and more marked shrinkage of the RF than if the component dots are dispersed over a wider area, but keeping the radial distances of the individual dots from the RF-center constant. The data suggest that the dispersion of the component dots in different backgrounds plays an important role as response amplitude and RF diameter increase proportional to the dispersive area of the background patterns. For transient cells, all backgrounds used showed similar effects on center responses and RF diameter, indicating that for them it was the light flux of the backgrounds rather than their spatial property that caused the effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269448
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structural aspects of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] tuberculate ectomycorrhizae (1992)
    Springer
    Trees 6 (1992), S. 137-146 
    Details
    ISSN: 1432-2285
    Keywords: Pseudotsuga ; Tubercles ; Ectomycorrhiza ; Calcium oxalate ; Bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tubercles of Pseudotsuga menziesii consisted of clusters of ectomycorrhizae surrounded by a peridiumlike rind. Energy dispersive spectroscopy demonstrated that crystals found in the zone of loose hyphae extending from the inner rind to the mantle of each root probably contain calcium oxalate. Inner mantle and Hartig net hyphae showed a labyrinthine branching pattern and stored carbohydrates and protein. The Hartig net formed up to inner cortical cells which had thickened, darkly stained walls. Bacteria were located either along with hyphae within the rind or as colonies on the surface of the tubercle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202429
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence of nitrogen-fixing Azospirillum in vesicular-arbuscular mycorrhizal fungi (1989)
    Springer
    Plant and soil 116 (1989), S. 286-288 
    Details
    ISSN: 1573-5036
    Keywords: Azospirillum ; Endogone ; Gigaspora ; Glomus ; spores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrogenase activity measured by acetylene reduction, was detected when surface-sterilized spores of vesicular-arbuscular (VA) mycorrhizal fungi (Glomus fasciculatum, G. intraradices, G. scientillans, G. mosseae, Gigaspora gilmorei andEndogone dusii) were inoculated into nitrogen-free liquid medium containing malic acid and incubated under microaerophilic conditions (99% N2+1% O2) at 30°C.Azospirillum species were isolated from the nitrogenase-active cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214561
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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