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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 219 (1978), S. 261-271 
    ISSN: 1432-1459
    Keywords: Fusimotor endings ; Acetylcholinesterase ; Parkinsonism ; Motor neuron disease ; Myasthenia ; Muscle spindles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Serienschnitten wurden die motorischen Endplatten der intrafusalen Muskelfasern in Muskelspindeln von Patienten mit Parkinsonismus, myatrophischer Lateralsklerose und Myasthenia gravis mittels Acetylcholinesterasereaktion untersucht. Beim Parkinsonismus erschienen die diffusen Endigungen, von welchen angenommen wird, daß sie die Endigungen des Gammafasersystemes darstellen, nennenswert verbreitert, während die en-plaque- und en-grappe-Endigungen atrophisch erschienen. In den Fällen von myatrophischer Lateralsklerose erwiesen sich en-plaque- und en-grappe-Endigungen, von welchen angenommen wird, daß sie zu den Betaneuronen und den dynamischen Gammafasern gehören, als ausgesprochen atrophisch. Die diffusen Endigungen allerdings waren normal. Bei Myasthenia gravis und dem myasthenischen Syndrom von Eaton-Lambert zeigten en-plaque- und engrappe-Endigungen Atrophien, während einzig die diffusen Endigungen ausgespart blieben. Es wird die Bedeutung dieser Veränderungen diskutiert.
    Notes: Summary Pathological changes of the fusimotor endings in parkinsonism, motor neuron disease and myasthenia were examined by the acetylcholinesterase technic on serial sections. In parkinsonism, the diffuse endings, which are thought to be supplied by the static gamma nerve fibers, showed remarkable enlargement, while en plaque and en grappe endings were atrophic. In motor neuron disease, en plaque and en grappe endings, which are thought to be innervated by the beta nerve fibers and dynamic gamma nerve fibers respectively, revealed marked atrophy. However the diffuse endings were normal. In myasthenia gravis and myasthenic syndrome (Eaton-Lambert syndrome), en plaque and en grappe endings were atrophic, though only the diffuse endings were spared. The significance of these changes in the fusimotor endings is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 34 (1985), S. 577-585 
    ISSN: 1573-5060
    Keywords: Oryzasativa L. ; rice ; Xanthomonas campestris pv. ; oryzae ; bacterial leaf blight ; resistance ; induced mutations ; seleetion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dry seed lots of a rice cultivar, Harebare, susceptible for bacterial leaf blight (BLB), were exposed to thermal neutrons with and without pre-treatment of seed for boron-enrichment, and to gamma-rays. M1 plants of each of the treatments were grown and their seeds were separately harvested. M2 populations were raised in rice fields of a farmer in a region where BLB is epidemic every year, and M2 and control plants which expressed resistant reactions to BLB were selected. M3 and control lines as plant progenies of the selected M2 plants were raised in the same rice fields as in M2 generation in order to investigate their BLB resistance and other agronomically important traits. Variances for disease severity of M2 populations were significantly larger than those of the control population. whereas their means were not singificantly different from that of the control population, suggesting induction of mutations toward both resistance and susceptibility to BLB. Mean disease severity values of the M3 lines from selected M2 plants were significantly smaller than those of the control lines, indicating gains of selection in M2 for quantitative resistance against BLB. Thermal neutrons, especially with boron-enrichment pre-treatment were effective to induce mutations for resistance against BLB. Some M3 mutant lines with quantitatively enhanced resistance against BLB were not modified in other agronomic traits from those of the original cultivar. Significance of the induced quantitative resistance in breeding programmes for BLB resistance is discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 28 (1979), S. 697-704 
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; gamma-radiation ; temperature ; mutation frequency ; heading date
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dry seeds of rice, Oryza sativa L., containing about 13 percent moisture, were exposed to 60Co gamma raysat extremely low temperature (−196°C). M1 damage on survival rate, seedling height and seed set were found to become much smaller in the cooling treatment than in the not-cooled control. Chlorophyll and heading date mutation frequencies in the M2 generation were not affected by the decreased M1 damage caused by the cooling treatment, and the mutation frequencies could be significantly increased by applying higher doses combined with the cooling treatment. Frequency of sterile or semi-sterile mutants in the M2 generation was found to be significantly lower in the cooling treatment than in the not-cooled control. It is assumed from the experimental results that extremely low temperatures during irradiation could reduce the amount of physiological damage and gross chromosome aberrations. This results in an increased efficiency of producing minute deletions and/or point mutations.
    Type of Medium: Electronic Resource
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