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  • Springer  (397)
  • Oxford University Press  (10)
  • American Society of Hematology  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Stylet activities and potato virus Y vector efficiencies by the aphids Brachycaudus helichrysi and Drepanosiphum platanoidis (1992)
    Springer
    Entomologia experimentalis et applicata 62 (1992), S. 293-300 
    Details
    ISSN: 1570-7458
    Keywords: Aphids ; Brachycaudus helichrysi ; Drepanosiphum platanoidis ; electrical penetration graphs ; potato virus Y ; stylet activities ; vector efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stylet penetration activities of two aphid species were recorded electrically and compared with their efficiency of potato virus Y transmission. B. helichrysi (Kltb.) acquired the virus during 15% of single penetrations on infected leaves. These acquisitions were associated with the occurrence of cell membrane puncture by stylets, recorded during 44% of the penetrations. D. platanoidis (Schrank) punctured membranes during only 8% of penetrations, and its acquisition efficiency was less than 1%. The frequency with which aphids puncture cell membranes appears to partially determine their vector efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353449
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  • 2
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the stylet pathway of the brown planthopper Nilaparvata lugens (1990)
    Springer
    Entomologia experimentalis et applicata 54 (1990), S. 191-193 
    Details
    ISSN: 1570-7458
    Keywords: Electronic monitoring ; Nilaparvata lugens ; plant penetration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343529
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  • 3
    Electronic Resource
    Electronic Resource
    Messung des Reflexionsvermögens von glühendem Wolfram im ultravioletten Teil des Spektrums (1930)
    Springer
    The European physical journal 64 (1930), S. 39-42 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird die Energieverteilung einer 300 Watt-Nitralampe in dem Wellenlängenbereich zwischen 400 und 340 mμ bestimmt. Dabei stellte sich eine gute Übereinstimmung zwischen den gefundenen und den aus der Wien-Planckschen Strahlungsformel für eine bestimmte Farbtemperatur der Lampe errechneten Werten heraus. Das Emissionsvermögen von glühendem Wolfram (T=21000 abs.) wird in einem Wellenlängenbereich zwischen 436 und 270 mμ bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01397425
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  • 4
    Electronic Resource
    Electronic Resource
    Mesophyll cell damage of wheat plants caused by probing of the aphid, Metopolophium dirhodum (1986)
    Springer
    Entomologia experimentalis et applicata 42 (1986), S. 195-198 
    Details
    ISSN: 1570-7458
    Keywords: aphid damage ; cereal plants ; Metopolophium dirhodum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343547
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  • 5
    Electronic Resource
    Electronic Resource
    Xylem ingestion by aphids — a strategy for maintaining water balance (1990)
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 101-104 
    Details
    ISSN: 1570-7458
    Keywords: Aphid feeding ; electronic recording
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Une nouvelle onde, de type G, décelée pendant l'enregistrement des électropénétrogrammes (EPG's) des pucerons est nettement associée à la prise d'aliments marqués radioactivement. Pendant l'onde G, les extrémités des stylets maxillaires sont situées dans les éléments conducteurs du xylème et l'on en conclu que l'onde G représente l'ingestion du contenu du xylème. Les pucerons déshydratés présentent une plus grande fréquence et une durée plus longue d'absorption de xylème, ce qui suggère qu'elle est liée à l'équilibre hydrique de l'insecte.
    Notes: Abstract A new waveform, pattern G, detected during recording of electrical penetration graphs (EPG's) from aphids was strongly correlated with uptake from radioactively labelled artificial diets. During pattern G, maxillary stylet tips were located within xylem conductive elements and it was concluded that pattern G is representative of ingestion of xylem sap. Dehydrated aphids showed a higher incidence and greater duration of xylem uptake, suggesting that its occurrence is related to the water balance of the insect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352570
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  • 6
    Electronic Resource
    Electronic Resource
    A method for amputating homopteran stylets using a pulsed dye laser (1992)
    Springer
    Entomologia experimentalis et applicata 65 (1992), S. 301-304 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02343863
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  • 7
    Electronic Resource
    Electronic Resource
    Fine structure of aphid stylet pathways and its use in host plant resistance studies (1985)
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 293-295 
    Details
    ISSN: 1570-7458
    Keywords: plant resistance ; aphid feeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Conclusion Although there have been reports, based on light microscope observations, of damage to mesophyll tissue as a result of stylet penetration, we saw no evidence of this in our wax sections. However, the use of the electron microscope revealed that such damage does occur, and has also shown that both inter- and intracellular penetration routes exist, often within the same track, whereas we had formerly believed the stylet pathways of these aphids to be almost entirely intercellular. The intramural-extracellular route of penetration, characterised by the presence of stylets and or saliva between the cell wall and plasmalemma, requires the greater resolution of electron microscopy and cannot be distinguished in light microscope preparations. Our results suggest that an accurate indication of the stylet pathway cannot be obtained from the use of light microscopy alone, and raise serious doubts about the value of previous studies describing the route of stylet penetration. Light microscopy shows the track only at the tissue level and not at the cellular level. We advocate that all future studies of aphid stylet penetration should utilise both light and electron microscope studies because only the higher resolution of the latter technique will indicate the true stylet pathway and the end points of the tracks. Only then can the feeding site be determined with any precision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295266
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  • 8
    Electronic Resource
    Electronic Resource
    Bemerkung zu der Erscheinung der Granulation (1965)
    Springer
    Naturwissenschaften 52 (1965), S. 298-298 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608025
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  • 9
    Electronic Resource
    Electronic Resource
    Bemerkungen zu der Erscheinung der Granulation (1965)
    Springer
    Naturwissenschaften 52 (1965), S. 53-54 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695648
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous oxygen production and nitrogenase activity of an ammonia-excreting mutant of the cyanobacterium Anabaena variabilis in a co-culture with wheat (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 798-804 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A mutant strain of Anabaena variabilis, strain SA-1 that supported growth of wheat plants in a hydroponic co-culture in nitrogen (N) free medium also produced enough oxygen (O2) to support root respiration. The steady-state concentration of net O2 in the co-culture was dependent on incident light intensity. At an incident photosynthetic photoflux (PPF) of 1000 μmol photons·m−2·s−1, net O2 evolution by the co-culture in the root zone reached a maximum value of about 220 μmol O2 evolved·h−1·mg chlorophyll (Chl)−1. The O2 concentration in the rhizosphere of the co-culture stayed above the ambient air level. O2 uptake in the dark by strain SA-1-supplemented wheat roots washed free of cyanobacterium was higher than the root respiration of nitrate-grown plants. Nitrate-grown plants required aeration for maximum growth while the wheat-cyanobacterial co-culture can be cultured without aeration. These results show that O2 produced by strain SA-1 can be used to supply the O2 needs for root respiration of wheat. Respiration reduced net O2 evolution by the mutant SA-1, decreasing the partial pressure of O2 at the sites of cyanobacterial attachment to the roots. This led to an increase in the specific activity of nitrogenase of the co-culture at the high light intensities used to support wheat growth. This activity of about 30 μmol ethylene produced·mg Chl−1·h−1 was three-fold higher than the activities obtained with the free-living strain SA-1 assayed at the same light intensity. In the co-culture, ammonia produced by the mutant strain SA-1 was not detectable. The NH inf4 sup+ produced by strain SA-1 was used by the wheat plants and, under these conditions, the total N content of the plants reached as high as 85% of the total N content of nitrate-grown plants. In the co-culture system the metabolism of wheat and the cyanobacterium complemented each other, leading to higher plant growth in N-free medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00169898
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