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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 12 (1964), S. 289-314 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die verschiedenen Formen von Bewußtsein und Bewußtlosigkeitszuständen können beim Menschen, besonders an Patienten mit Hirnverletzungen, cerebrovasculären Insulten, Epilepsie und Hirntumoren untersucht werden. Die Ursache des plötzlichen Bewußtseinsverlustes bei der Gehirnerschütterung ist noch umstritten. Bei den cerebralen Gefäßkrankheiten ist die Ruptur eines Aneurysmas im vorderen Anteil des Circulus Villisii oft mit schweren Bewußtseinsstörungen verbunden. Die Bedeutung der medial-rückwärtigen Anteile des Stirnlappens für das Aufrechterhalten der Bewußtseinsfunktionen wird hervorgehoben. Strukturen in der Nachbarschaft des 3. Ventrikels und des Aquäduktes spielen in dieser Hinsicht ebenfalls eine große Rolle. Die reticulären Strukturen des Hirnstammes können dagegen beträchtlich durch Tumorinfiltration beeinträchtigt sein, ohne daß gröbere Bewußtseinsstörungen auftreten. Eine erhebliche Substanzminderung in Bereichen, die für das Bewußtsein von Bedeutung sein sollen, ist also noch nicht ausreichend, das Bewußtsein auszulöschen. Der Zeitfaktor (Dott) ist eine notwendige Komponente für die völlige Funktionsunterbrechung. Die chronischen Bewußtseinsstörungen nach schweren Schädelhirnverletzungen und nach Strangulationen bieten besonders Gelegenheit zum Studium des Mechanismus des Bewußtseins. Biochemische Funktionsstörungen und gestörte Energieproduktion dürften in manchen Fällen die ganze Hirnsubstanz beeinträchtigen. In jedem Fall von Bewußtseinsstörung ist die zentrencephale Integration im SinnePenfields beeinträchtigt.
    Abstract: Résumé Les différents aspects d'états conscients et inconscients chez l'homme peuvent être particulièrement étudiés sur des malades blessés à la tête, avec accidents cérébro-vasculaires, atteints d'épilepsie et tumeurs intracrâniennes. La cause de la perte soudaine de conscience par commotion du cerveau est encore un sujet de discussion, et des opinions variées se présentent. Parmi les maladies cérébro-vasculaires, la rupture d'anévrismes sacculaires sur la partie antérieure du cercle de Willis s'accompagne souvent de troubles graves de conscience. L'importance des régions médianes postérieures des lobes frontaux dans le maintien des fonctions de la conscience est notée. Des structures dans le voisinage du IIIème ventricule et de l'aqueduc de Sylvius jouent aussi un rôle essentiel à cet égard. La formation réticulaire de la base du cerveau peut être gravement atteinte d'infiltrations de tumeur, sans détériorations sérieuses de la conscience. Une réduction massive de la quantité de tissu nerveux dans des parties considérées importantes pour la conscience est ainsi nettement insuffisante pour abolir l'état conscient. Le facteur temps deDott est un constituant nécessaire pour une complète rupture de la fonction. Les troubles chroniques de la conscience observés sur des blessures graves crânio-cérébrales et après strangulation se prêtent surtout à l'étude des mécanismes de conscience. La dysfonction biochimique et la production troublée d'énergie à travers toute la substance cérébrale doivent être impliquées dans de nombreux cas. Dans chaque exemple de troubles de la conscience l'intégration centroencéphalique dans le sens dePenfield est affectée.
    Notes: Summary The different aspects of conscious and unconscious states in humans may be studied particularly in patients with head injuries, cerebro-vascular accidents, epilepsy and intracranial tumours. The cause of the sudden loss of consciousness in concussion of the brain is still a matter of discussion, and various opinions are presented. Among the cerebro-vascular diseases the rupture of saccular aneurysms on the anterior part of the circle of Willis is often accompanied by severe disturbances of consciousness. The importance of the posterior mesial parts of the frontal lobes in the maintenance of functions of consciousness is stressed. Structures in the vicinity of the third ventricle and the aqueduct of Sylvius also play an essential rôle in this respect. The reticular formation of the brain stem may be severely affected by tumour infiltrations without serious impairment of consciousness. A massive reduction of the amount of nervous tissue in regions considered significant for consciousness is thus not sufficient to abolish the conscious state. The time factor ofDott is a necessary component for a complete disruption of function. The chronic disturbances of consciousness observed in severe craniocerebral injuries and after strangulation lend themselves particularly to studies on the mechanisms of consciousness. Biochemical dysfunction and disturbed energy production throughout the entire brain substance must be involved in many cases. In every instance of disturbed consciousness the centrencephalic integration inPenfield's sense is affected.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Gene 98 (1991), S. 161-167 
    ISSN: 0378-1119
    Keywords: 5 S RNA-protein complex ; Ciliate ; UAA suppression in vitro ; common sequence motifs ; homologous proteins ; macronuclear gene structure ; multiple transcription start points ; recombinant DNA ; splice sites
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    BBA Section Nucleic Acids And Protein Synthesis 521 (1978), S. 435-451 
    ISSN: 0005-2787
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0378-1119
    Keywords: Ciliate ; homologous proteins ; macronuclear gene structure ; multiple transcription start points ; recombinant DNA
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 121 (2002), S. 0 
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The aim was to develop an efficient chromosome doubling method for Miscanthus sinensis to enable the production of triploids and so avoid seed dispersal to the environment. Antimitotic treatments with colchicine or oryzalin were tested in M. sinensis cl. MS-88-110 on: (1) in vitro shoots and plants established in soil; (2) during propagation of embryogenic callus; and (c) during the initial stages of callus induction. All systems produced chromosome-doubled plants. A higher percentage of tetraploids was found after antimitotic treatment at the explant or callus level compared with treatment of in vitro shoots or plants established in soil. In general, oryzalin was more toxic to plant material than colchicine. A higher frequency of chimeras was found among plants with altered ploidy level when the target was formed shoot buds compared with adventitious shoot formation from callus. Antimitotic treatment of embryogenic callus from shoot apices also resulted in a high degree of albinism.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Experimental Cell Research 118 (1979), S. 159-169 
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Scientia Horticulturae 46 (1991), S. 315-322 
    ISSN: 0304-4238
    Keywords: Ficus benjamina ; aftereffect ; clones ; ex vitro ; growth rate ; micropropagation ; post-propagation growth ; root formation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Scientia Horticulturae 35 (1988), S. 275-283 
    ISSN: 0304-4238
    Keywords: Campanula carpatica ; far red light ; flower development ; flower differentiation ; flower initiation ; light quality ; photoperiod ; red light ; stem elongation ; temperature
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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