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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 100 (2000), S. 221-231 
    ISSN: 1432-2242
    Keywords: Key words Mitochondrial DNA ; RFLP analysis ; Triticum ; Aegilops ; Plasmon phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The first comprehensive analysis was made of restriction fragment length polymorphism (RFLP) of the mitochondrial (mt) DNA of two related genera, Triticum (wheat) and Aegilops. This led to clarification of the nature of mtDNA variability and the inference of the phylogeny of the mitochondrial genomes (=chondriome). Forty-six alloplasmic lines and one euplasmic line of common wheat (2n = 42, genomes AABBDD) carrying plasmons (cytoplasmic genomes) of 47 accessions belonging to 33 species were used. This consisted of nearly all the Triticum and Aegilops species. RFLP analysis, carried out with seven mitochondrial gene probes (7.0 kb in total) in combination with three restriction endonucleases, found marked variation: Of the 168 bands detected, 165 were variable (98.2%), indicative that there is extremely high mtDNA variability in these genera. This high variability is attributed to the variation present in the intergenic regions. Most of the variation was between chondriomes of different plasmon types; only 8 bands (4.8%) between those of the same plasmon types were variable, evidence of clear chondriome divergence between different plasmon types. The first comprehensive phylogenetic trees of the chondriome were constructed on the basis of genetic distances. All but 1 of the polyploids had chondriomes closely related to those of 1 putative parent, indicative of uniparental chondriome transmission at the time of polyploid formation. The chondriome showed parallel evolutionary divergence to the plastome (chloroplast genome). Use of a minimum set of 3 mtDNA probe-enzyme combinations is proposed for tentative plasmon type identification and the screening of new plasmon types in those genera.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Neurosurgical review 4 (1981), S. 185-190 
    ISSN: 1437-2320
    Keywords: Blood flow ; Brain oedema ; Brain tumours ; Cats ; Corticosteroids ; EEG ; Hirndurchblutung ; Hirnödem ; Hirntumoren ; Katzen ; Kortikosteroide ; EEG
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Katzen wurden experimentelle Hirntumoren durch stereotaktische Implantation von suspendierten Tumorzellen eines Rattengliomklon in die innere Kapsel hervorgerufen. Innerhalb von drei Wochen entwickelte sich am Implantationsort ein kugelförmiger Tumor mit einem Durchmesser von etwa 10 mm. Um den Tumor herum entstand ein ausgedehntes vasogenes Ödem, das sich in der weißen Substanz ausbreitete. Bei unbehandelten Tieren stieg der Wassergehalt im ödematösen Mark von 69.1 ± 0.9 auf 80.0 ± 0.8 ml/100 g Feuchtgewicht an, und die Durchblutung sank in diesem Gebiet von 32.2 ± 5.6 auf 18.9 ± 0.05 ml/100 g/min ab. Die einmalige intramuskuläre Injektion einer kristallinen Suspension von 10 mg/kg Dexamethason bewirkte innerhalb einer Woche eine signifikante Abnahme des Hirnödems. Der Wassergehalt sank auf 73.0 ± 0.5 ml/100 g Feuchtgewicht und die Durchblutung stieg über den Kontrollwert hinaus auf 35.7 ± 2.8 ml/100 g/min an. Die Veränderungen wurden von entsprechenden Elektrolytverschiebungen begleitet, korrelierten jedoch nicht mit EEG-Veränderungen, die mit der Fourier Frequenz-Analyse quantitativ ausgewertet wurden. Die Kortikosteroid-Behandlung verhinderte nicht die Extravasation von Peroxidase oder Evans Blau aus den Tumorgefäßen. Die therapeutische Wirkung wird deshalb auf eine Beschleunigung der Resorption oder eine Inhibition der Ausbreitung der Ödemflüssigkeit von dem Tumor in das peritumorale Hirngewebe zurückgeführt.
    Notes: Summary Experimental brain tumours were produced in cats by stereotactic implantation of 4 million suspended cells of a rat glioma clone into the internal capsule. Three weeks after implantation a spherical tumour developed with a diameter of up to 10 mm which was surrounded by vasogenic white matter oedema. In untreated animals water content in the peritumoural white matter increased from 69.1 ± 0.9 to 80.0 ± 0.8 ml/100 g w. w., and regional blood flow reciprocally decreased from 32.2. ± 5.6 to 18.9 ± 0.05 ml/100 g/min. A single injection of a crystalline suspension of 10 mg/kg dexamethasone given intramuscularly one week before the animals were killed, led to a significant amelioration of brain oedema. Peritumoural white matter water content decreased to 73.0 ± 0.5 ml/100 g w. w. and blood flow rose to 35.7 ± 2.8 ml/100 g/min. These changes were accompanied by parallel shifts of electrolyte content but they did not correlate with EEG activity, as assessed by Fourier frequency analysis. Corticosteroids did not prevent extravasation of peroxidase or Evans blue across the tumour vessels. The beneficial effect, therefore, is attributed to either an acceleration of resorption or an inhibition of the spread of oedema from the tumour into the peritumoural brain tissue.
    Type of Medium: Electronic Resource
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