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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Planta 163 (1985), S. 164-174 
    ISSN: 1432-2048
    Keywords: Greening ; Guzmania ; Heliconia ; Hypsophyll ; Plastid transformation ; Postfloral greening ; Spathiphyllum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ultrastructural and biochemicalphysiological aspects of postfloral greening have been studied in hypsophylls of Heliconia aurantiaca Ghiesbr., Guzmania cf. x magnifica Richter and Spathiphyllum wallisii Regel. In all three species the greening of the hypsophylls is due to plastid transformation, chloroplast formation proceeding from the initially different types of plastids. The degradation process of the original plastid structures and the mode of thylakoid formation are distinct in each case. In none of the species do the transformed plastids look identical to the chloroplasts of the corresponding foliage leaves. On a chlorophyll basis, the rate of photosynthesis of the greened hypsophylls surpasses the rate of the leaves considerably in Spathiphyllum, but is much lower in Heliconia (no data for Guzmania). In all species, anatomy, plastid structure, pigments, 77° K-fluorescence emission, ribulose-1,5-bis-phosphate carboxylase activities and short-term photosynthesis 14CO2-assimilation patterns prove the greened hypsophylls to be capable of providing additional carbon to the developing fruits, thus supplementing the import of organic matter from the foliage leaves.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 52 (1974), S. 238-245 
    ISSN: 1432-1440
    Keywords: Multiple Sclerosis ; lymphocyte transformation ; myelin basic protein ; auto-immune disease and immune status in M.S. ; vaccinia-antigen and chronic virus infection ; immunosuppression ; Multiple Sklerose ; Lymphocytentransformation ; basisches Markscheidenprotein ; Autoimmunisationsvorgänge und Immunstatus bei Multipler Sklerose ; Vaccinia-Antigen und chronische Virusinfektion ; Immunosuppression und Lymphocytentransformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 40 Kranken mit Multipler Sklerose (M.S.) und verschiedenen Kontrollgruppen von insgesamt 55 Personen wird die Lymphocytentransformation (14C-2-Thymidininkorporation) durch eine Anzahl von Antigenen untersucht. — M.S.-Kranke haben eine signifikant erhöhte Transformationsrate durch basisches Markscheidenprotein. Es besteht eine Korrelation zum Prozeßstadium und zum Schweregrad der Erkrankung. Der Befund zeigt immunologische Vorgänge an, die auf den Untergang von Markscheidengewebe zurückgehen, ist aber nicht für M.S. spezifisch, denn er läßt sich auch bei Kranken mit akuten cerebralen Prozessen erheben. Mit dem Lymphocytentransformationstest kann der Nachweis einer Autoaggressionskrankheit für die M.S. nicht erbracht werden. — Die Transformationsraten durch PHA, Human-Gammaglobulin und Tuberkulin, sowie die Spontantransformation bei M.S.-Kranken entsprechen denen der Kontrollen. Vaccinia-Antigen führt zu einer signifikant erhöhten Lymphocytentransformationsrate bei M.S.-Kranken und bei frisch gegen Pocken geimpften Personen. Dieser Befund bedarf weiterer Abklärung als Hinweis auf eine mögliche chronische Virusinfektion bei M.S. — Durch eine Langzeitbehandlung mit Azathioprin kommt es für alle geprüften Antigene bei Kranken mit M.S. nicht zu einer signifikanten Erniedrigung der Transformationsraten.
    Notes: Summary Lymphocyte transformation (14C-2-thymidin incorporation) is tested with a number of antigens on 40 patients with Multiple Sclerosis (M.S.) and different control groups totalling 55 subjects. M.S. patients have a significantly increased transformation by myelin basic protein. The transformation indexes correlate with the stage and the degree of severity of M.S. The finding indicates immune reactions induced by the destruction of myelin. This is, however, non specific to M.S. alone, since this same finding arises also in patients with other acute cerebral diseases. The lymphocyte transformation cannot proof that M.S. is an autoimmune disease. — The transformation by PHA, human gamma-globulin and tuberculin, as well as the spontaneous transformation in M.S. patients matches those of the control groups. Vacciniaantigen leads to a significantly increased lymphocyte transformation in M.S. patients as well as in subjects recently inoculated against smallpox. This finding needs further clarification and points to a possible chronic virus infection in M.S. A prolonged therapy with Azathioprin does not significantly reduct the transformation for any tested antigen in M.S. patients.
    Type of Medium: Electronic Resource
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