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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 37 (1960), S. 1-6 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Die durchgeführten Versuche haben gezeigt, daß Actinomyces globisporus streptomycini LS-1 in Submerskultur stark katalasewirksam war. Die höchste meßbare Aktivität der Katalase ging dem Maximum der Streptomycinproduktion voraus. Zunehmende Eisenkonzentrationen, die mehr als 50–100 mg Fe++/l Kulturlösung betrugen, hemmten sowohl die Katalase als auch die Streptomycinbildung. In stark belüfteten Kulturen stieg die Katalase- und die Streptomycinbildung. Eine künstlich gesteigerte Katalaseaktivität ging nicht mit einer intensiveren Biosynthese des Streptomycins parallel. In einer katalaseaktiven Kulturlösung konnte zugegebenes H2O2 das gleichzeitig in der gleichen Kulturlösung vorhandene antibiotische Stoffwechselprodukt nicht unwirksam machen. In katalaseinaktiver Kulturlösung war bei einer gleichbleibenden Konzentration von 0,1 m H2O2 ebenfalls keine Abnahme der Streptomycinwirksamkeit in dem Kulturfiltrat zu beobachten.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 54 (1967), S. 492-492 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1557-1559 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tetracycline hydrochloride treatment decreased the transmission rate of potato leafroll virus (PLRV) byMyzus persicae. It also prevented the PLRV-induced swellings of the A/F nuclei of the salivary gland. Apparently there is a connection between these two phenomena. The A/F cells may be a site of virus multiplication.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    GeoJournal 14 (1987), S. 376-376 
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 11 (1968), S. 450-454 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Principal salivary glands were separated under a stereo-microscope from adult wingless Myzus persicae which had been totally immersed in Feulgen stain. The nuclei were compared in size and shape and then assigned to different gland cells. In this way at least nine different cell types could be differentiated in the principal salivary gland. They have been labelled with letters A to I (see Fig. 1). In the main region there are four A-cells in two pairs, one pair of B-cells with larger nuclei, and the odd C-cell, which has a nucleus about double the size of those in B-cells. On the other side of each gland lobe are one pair of D-cells and one pair of F-cells. Nuclei of E-cells are very small compared with those of G-cells, which are extremely large and show a loose structure. The region of cover cells is composed of five cells (H) with irregularly shaped and weakly staining nuclei, and one odd cell (I) with a circular, intensely stained nucleus. In further studies the different cell types will be determined by specific histochemical reactions with a view to distinguishing different kinds of transmission of plant viruses by aphids.
    Notes: Zusammenfassung Die Hauptspeicheldrüse von Myzus persicae (Sulz.) erwies sich als ein differenziert aufgebautes Organ. An herauspräparierten ganzen Drüsen, die nach Feulgen gefärbt waren, wurden Größe und Form der einzelnen Zellkerne verglichen und auf diese Weise neun verschiedene Drüsenzellen unterschieden.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 13 (1970), S. 153-161 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Fixed and sectioned principal salivary glands of Myzus persicae stained with acridine orange at different pH-values (pH 2.6–7.0) were investigated under the fluorescence microscope. There were 4 groups of cells, which differed in their ability to absorb acridine orange (Abb. 1). By histochemical demonstration of different substrates a characterization of those 4 groups was possible: 1. Cells A and F (see Abb. 1) contain much RNA and also much protein, which is distinguished by a high cystine content. 2. Cells B, C and I contain much RNA and protein, but reactions for disulphide groups (cystine) were negative. There was an additional high content of hyaluronic acid. 3. Cells D and E. Besides RNA and protein, PAS-positive and Hale-positive substances were found. Because of the different distribution of the latter two substances in the cell different polysaccharides are assumed. 4. Cells G and H. In the G-cells no considerable amounts of RNA, protein and polysaccharides were found. In the H-cells only a weak PAS-reaction took place. Probably these cells produce no secretion for the saliva. The stylet sheath was Hale- and PAS-positiv; thus the presence of protein could be demonstrated.
    Notes: Zusammenfassung In der Hauptspeicheldrüse von Myzus persicae wurden mit histochemischen Nachweismethoden vier Zellgruppen bestimmt. Diese Zellgruppen ließen sich fluoreszenzmikroskopisch auf Grund ihres Bindungsvermögens für Acridinorange unterscheiden, außerdem durch ihren Gehalt an RNS und verschiedenen Proteinen sowie durch ihren Gehalt an Kohlenhydraten (PAS-Reaktion), Hyaluronsäure und anderen Hale-positiven Substanzen. Die Speichelscheide reagierte auf Nachweise für Kohlenhydrate und Protein positiv.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 14 (1971), S. 161-174 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Concentrations of potato leaf roll virus (PLRV) which are sufficient for transmission accumulate in Myzus persicae after feeding on infected Physalis floridana in about a week at the latest (Table I, Fig. 1). After a feeding period of 1 or 2 days, sweling of the A/F-nuclei of the salivary glands was observed, which showed a bimodal statistical distribution (Table II, Fig. 2). Prolonged feeding did not markedly alter the degree of swelling. These nuclei swelled to the same extent when aphids were kept for only 8 hours or 3 days on infected P. floridana and then transferred to healthy P. floridana (Table III). The swelling of the nuclei might be due to the presence of virus. This was concluded from experiments in which the aphids were first kept on other hosts (Table IV, Fig. 3–6a), later transferred for a short period to healthy (b) or to infected P. floridana (c) and then retransferred to the original aphid hosts. The swelling of nuclei was observed only with those aphids which had been kept on PLRV-infected P. floridana.
    Notes: Zussamenfassung Nach Übertragungsversuchen kann spätestens nach etwa einer Woche mit übertragungsfähigen Konzentrationen des Kartoffelblattrollvirus (PLRV) in M. persicae gerechnet werden. Schon nach 1- bis 2-tägiger Saugzeit auf PLRV-infizierten P. floridana wurden in den Blattlausspeicheldrüsen Schwellungen der A/F-Kerne ermittelt, die sich in 2-gipfeligen Größenverteilungen äußerten. Längere Saugzeiten änderten die Größenverhältnisse nicht wesentlich, verkürzte Infektionszeiten und anschließendes Saugen auf gesunden Pflanzen beinflußte das Ergebnis ebenfalls kaum. Die gleichen Größenverhältnisse zeigten die A/F-Zellkerne, wenn Blattläuse, die von anderen Wirtspflanzen stammten, 1 Tag auf PLRV-infizierten P. floridana saugten und danach auf die jeweiligen Wirtspflanzen zurückkamen. Dies traf jedoch nicht bei Blattläusen zu, die statt dessen auf gesunden P. floridana saugten. Es wird deshalb angenommen, daß es sich bei diesen Kernschwellungen um Einflüsse des PLRV auf die Blattlausspeicheldrüse handelt.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    GeoJournal 17 (1988), S. 434-434 
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 14 (1971), S. 107-114 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The nuclei of the different cell types in the salivary gland of Myzus persicae may show considerable variation in their sizes depending on the hostplants on which the aphids have been reared. This influence of the hostplants has been studied in efforts to elucidate the role of the salivary gland in plant virus transmission. The results are summarized in Fig. 1. The designation of the different cell types is the same as in earlier publications (Weidemann 1968, 1970). It is seen that the extent of nuclear swelling and the type of cells affected by this phenomenon vary depending on the hostplants. The swelling is accompanied by structural changes in the nuclei (Figs 4–6). In view of known relationships between the cell function and nuclear size it is suggested that the hostplant may have an influence on the composition of the saliva of the aphids. This influence could also be responsible for differences in the ability to transmit virus of aphids reared on different hostplants. The kind of structural changes of the nuclei suggests that different mechanisms may be responsible for the nuclear swelling in different cell types.
    Notes: Zusammenfassung Die Volumina der Zellkerne in den Speicheldrüsen von M. persicae sind nicht konstant, sondern variieren je nach Wirtspflanze der Blattlaus. Dabei kann es bei einzelnen Zelltypen zu starken Kernschwellungen kommen. Das Ausmaß der Kernschwellungen und die davon betroffenen Zelltypen können von Wirtspflanze zu Wirtspflanze wechseln. In der Diskussion wird auf die Beziehung zwischen Zellstoffwechsel und Kerngröße hingewiesen und vermutet, daß die Anteile der einzelnen Komponenten in der Speichelflüssigkeit wirtspflanzenabhängig sind. Im Hinblick auf wirtspflanzenabhängige Vektorleistungen der Blattläuse wird die Rolle des Speichels bei der Übertragung phytopathogener Viren diskutiert.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 9 (1969), S. 123-147 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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