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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 138 (1972), S. 329-346 
    ISSN: 1432-0568
    Keywords: Cerebellum ; Cytoarchitecture ; Man ; Rhesus monkey ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der Kleinhirnrinde von Mensch, Rhesusaffe und Katze lassen sich Unterschiede in der Zellgröße und Zellzahl in verschiedenen Kleinhirnabschnitten nachweisen. Im ältesten Kleinhirnabschnitt, dem Lobus nodulofloccularis sind die Purkinjezellen und die Körnerzellen stets größer als in den Lappen des Corpus cerebelli. Außerdem besteht noch eine Größendifferenz zwischen Wurm und Hemisphären. In den vermalen Abschnitten aller Kleinhirnlappen sind die Purkinjezellen und die Körnerzellen größer als in den dazugehörigen Hemisphärenanteilen. Daneben bestehen Unterschiede in der Zellzahl. Im Lobus nodulofloccularis ist die Zellzahl signifikant geringer als in den übrigen Kleinhirnabschnitten. Ähnlich wie bei der Zellgröße bestehen aber auch bei der Zellzahl Unterschiede zwischen den Hemisphären- und Wurmanteilen eines Kleinhirnlappens. In den Wurmabschnitten ist die Zellzahl geringer als in den Hemisphären. Die regionalen Unterschiede in der Cytoarchitektonik und das zahlenmäßige Verhältnis der Purkinjezellen zu den Körnerzellen bei Mensch, Rhesusaffe und Katze werden im Hinblick auf den evolutiven Status der Gehirne diskutiert.
    Notes: Summary In different parts of the cerebellar cortex of man, rhesus monkey and cat there are variations in the size and number of cells. In the lobus nodulofloccularis, the Purkinje cells and the granule cells are larger in diameter than in the corpus cerebelli. Moreover, the Purkinje cells and the granule cells in the vermal parts of the nodulofloccular lobe, the posterior lobe and the anterior lobe are always larger in size than in the hemispheres of these lobes. In addition there are differences in the number of cells: In the nodulofloccular lobe the number of cells per unit volume is significantly lower than in the different parts of the corpus cerebelli; in the vermal parts the number of cells is smaller than in the respective parts of the hemispheres. Thus there are parallels between the differences in size and in number of Purkinje cells and granule cells in the phylogenetic older (vermis) and younger (hemispheres) parts of the cerebellum. The regional differences in cytoarchitectonics of the cerebellar cortex in man, rhesus monkey and cat are discussed with respect to evolution.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 24 (1973), S. 340-344 
    ISSN: 1432-0533
    Keywords: Tubular Structures ; Glial Cells ; Cerebellar Cortex ; Macaca cynomolgus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the cerebellar cortex ofMacaca cynomolgus there are all types of glial cells as well as in other species. In the astrocytes, the Fañanas-cells and the microglia very often enlarged cisterns of the ergastoplasm occur in which tubular structures are located. These structures consist of very closely packed tubules with a diameter of 200 Å. The wall of the tubules is formed by a very fine granular material, their lumen is empty. These tubular structures of glial cells are only found in the cerebellar cortex. A possible similarity to viruses is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0630
    Keywords: Dye lasers ; Atomic spectroscopy ; Lifetimes ; Sodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The 42D level of sodium was populated in a stepwise excitation process involving two pulsed dye lasers. The lifetime of the 42D level was derived from the decay of the fluorescence intensity.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary From crosses between diploid and autotetraploid cytotypes of Hordeum vulgare L. (cultivated barley) and H. bulbosum L. (bulbous barley grass) diploid, triploid and tetraploid interspecific hybrids were produced. Both directly and after vegetative segregation crosses in either direction also gave rise to haploids and dihaploids resembling H. vulgare. The use of embryo culture was necessary. Plant morphology of the hybrids was much like that of H. bulbosum, although the hybrid plants were less vigorous. Meiosis in the hybrids was more or less disturbed, and this seemed to be the main cause of the high level of sterility.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 20 (1971), S. 181-194 
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In interspecific crosses between diploid and autotetraploid cytotypes of Hordeum vulgare L. (cultivated barley) and H. bulbosum L. (bulbous barley grass), several kinds of hybrid endosperm, vegetative tissue and generative tissue were studied. In all these tissues, mitotic disturbances occurred which resulted in chromosome elimination. The chromosomes of H. bulbosum were eliminated more frequently than those of H. vulgare. Differences between the three types of tissue might have been due to differences between their mitotic rhythms. Differences between various kinds of the same type of tissue were discussed in relation to the ratio of the total number of genomes in embryo, endosperm and maternal tissue, and the ratio of the genomes of the parental species within the hybrid nuclei. For both ratios assumptions as to the genetic value of each genome were taken into account. The cause of the disturbances was probably genic disharmony between the parental genomes.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European journal of wildlife research 16 (1970), S. 92-92 
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 22 (1973), S. 8-18 
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Meiosis in triploid Solanum tuberosum was studied in plants that originated from crosses between tetraploids and diploids, the latter being mainly dihaploids. Association of chromosomes in first metaphase was regular, being as expected for autotriploid material. In first anaphase lagging chromosomes occurred that mostly divided precociously into their chromatids, the amount of lagging chromosomes being more or less proportional to the average number of univalents at M I. The A I distribution of chromosomes over the poles fitted a normal distribution. In the second meiotic division also lagging chromosomes were observed. During this division disturbances occurred resulting in cells with more or less the somatic chromosome number. The origin of this aberration is discussed, together with the relation between meiotic behaviour and pollen stainability.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Monosomic lines of the wheat variety ‘Redman’ were used to study the genetics of the resistance to cereal root eelworm of the variety ‘Loros’, and to localize the locus determining this resistance. It was confirmed that the resistance is monogenic, the variety ‘Loros’ carrying the dominant allele. From a disease test with pathotype A of the cereal root eelworm on the F2 progenies from crosses between the monosomics and ‘Loros’ it could be concluded that chromosome 2B carries the locus determing the resistance. It was proposed to nominate the symbol Cre to this locus. The rightness of the monosomic condition was tested in the meiosis of hybrids between the monosomic lines and ditelosomic lines of the variety ‘Chinese Spring’. Furthermore data about transmission of the monosomic condition have been summarized.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 153 (1974), S. 219-226 
    ISSN: 1432-0878
    Keywords: Cerebellar cortex ; Man and other mammals ; Golgi cells ; Regional differences ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The number of Golgi cells per unit volume was determined in different regions of the cerebellar cortex of man and of ten other mammals. Despite the general belief in the uniform architecture of the cerebellar cortex, regional differences in the distribution of Golgi cells were found. In the inferior parts of the vermis, the number of Golgi cells per unit volume is twice that in the corresponding hemispheres. In addition, there are differences between the anterior and inferior parts of the vermis. These differences are a feature of the cytoarchitecture of the cerebellum in man and all the investigated mammals. The ratio of Purkinje cells to Golgi cells was also determined and found to differ in different species. In man, this ratio is 1∶1.5, while in the monkey and cat it is almost 1∶1.9 and in the rat 1∶3.3. These differences in the ratio of Purkinje cells to Golgi cells are discussed from the point of view of cerebellar evolution.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 134 (1972), S. 129-142 
    ISSN: 1432-0878
    Keywords: Cerebellar cortex (man, mammals) ; Supraganglionic plexus ; Recurrent collaterals ; Regional differences ; Myelo- and glia architectonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In der Kleinhirnrinde des Menschen, des Rhesusaffen und der Katze formen die rückläufigen Kollateralen der Purkinjezellen im unteren Drittel der Molekularschicht einen markhaltigen Plexus, den Plexus supraganglionaris. Dieser Plexus ist nicht in allen Abschnitten der Kleinhirnrinde gleichmäßig entfaltet, sondern zeigt starke regionale Unterschiede in seiner Dichte. Im Lobus nodulofloccularis, dem ältesten Kleinhirnabschnitt, ist der Plexus im Wurmanteil nur spärlich entwickelt, im dazugehörigen Hemisphärenanteil dagegen etwas stärker ausgebildet. Im Lobus posterior des Corpus cerebelli ist er im Wurm und in den Hemisphären nur sehr diskret angelegt. Seine stärkste Entfaltung erfährt der Plexus supraganglionaris im Lobus anterior des Corpus cerebelli. Hier nehmen im Wurmabschnitt die rückläufigen Kollateralen beinahe das untere Drittel der Molekularschicht ein, während der Plexus in den Hemisphärenanteilen nur schwach entwickelt ist. Die mögliche Bedeutung der regional unterschiedlichen Dichte des Plexus supraganglionaris für den intracorticalen Erregungsablauf wird diskutiert.
    Notes: Summary In the cerebellar cortex of man, rhesus monkey and cat the recurrent collaterals of the Purkinje cells form a myelinated plexus, the plexus supraganglionaris, in the lower third of the molecular layer. This plexus does not exhibit a uniform distribution in all parts of the cerebellar cortex but its density varies considerably in different regions. In the eldest part of the cerebellum, in the lobus nodulofloccularis, the plexus is developed sparsely in the region of the vermis, somewhat more, however, in the corresponding part of the hemispheres. In the lobus posterior of the corpus cerebelli there are only few collaterals in the vermis as well as in the hemispheres, while the plexus supraganglionaris is best developed in the lobus anterior. Here in the region of the vermis rather the lower third of the molecular layer is occupied by recurrent collaterals while in the hemispheres only a sparsely developed plexus can be observed. The possible importance of the regional differences in density of the plexus supraganglionaris in regard to the transmission of excitation is discussed.
    Type of Medium: Electronic Resource
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