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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 300-301 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Aluminium specimens were allowed to creep at (longitudinal tensile) stresses ranging between 1/20 ton and J ton/sq. in. at temperatures of 250, 300, 350 and 400 C, in all cases for approximately a hundred hours, and the average distance through which the grain boundaries migrated was measured. The ...
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 1358-1359 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Approximately 2-0-V, 60-cycle a.c. were introduced into the substrate, and this voltage passed through the slightly resistant substrate to ground. With the more conductive substrates, a resistance was placed at the ground end. The source of the voltage was a 6 VAC filament transformer (Stancor ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 1130-1131 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Adult apterous pea aphids, Acyrthosiphon pisum (Harris), were used in all tests and they fasted for about 24 h prior to probing. All observations of feeding and salivation activities were made using the feeding chamber previously described1. However, in this work, the activities were observed under ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 1000-1001 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 shows the structure, as seen under ordinary light -field conditions, of an ausformed steel, details of which are given below. The appearance can be varied a good deal by tilting the specimen, but there is usually uncertainty, as in Fig. 1, where one grain ends and another begins. Fig. 2 ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 1083-1083 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Impact tests have been made on specimens of this alloy supplied by Mr. A. E. L. Tate, who demonstrated that, in sheet form, it behaved as described above. The impact tests were made in a Charpy machine on notched specimens (for convenience the notches were of the Izod type) over a range of ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 27 (1980), S. 77-82 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Das für Blattläuse entwickelte Messystem wurde abgeändert, um die Probiersaugaktivität von Zikaden zu messen. Es wurden mehrere unterscheidbare Wellenformen registriert, wenn die Grüne Reiszikade, Nephotettix cincticeps, Reispflanzen und Rohrzuckerlösungen probierte. Basierend auf der chemischen Analyse der Ausscheidungen konnten diese Wellenformen mit der Futteraufnahme-und Speichelbildungsaktivität korreliert werden.
    Notes: Abstract The electronic measurement system developed for aphids has been modified to measure leafhopper salivation and ingestion activities. Several distinct waveforms were recorded when the rice green leafhopper, Nephotettix cincticeps (Uhler) probed rice plants and into sucrose solutions. These waveforms were correlated with ingestion and salivation activities based on chemical analysis of the excreta.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 20 (1964), S. 582-582 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Myzus persicae undAcyrthosiphon pisum nehmen beim Saugen an Saccharoselösungen Kohlenstoffteilchen bis zu einem Durchmesser von 0,5–1μ auf (ungefähre Weite des Nahrungskanals der Stechborsten). Demnach muss die um die Stechborsten ausgebildete Speichelscheide am Ende offen sein. BeiA. pisum konnte beobachtet werden, dass grössere Kohlenstoffteilchen an der Stechborstenspitze das Saugen deutlich behindern, was durch Bewegungen der Stechborsten und erneute Speichelabgabe behoben werden konnte.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 47 (1988), S. 115-125 
    ISSN: 1570-7458
    Keywords: probing behavior ; gustatory sensory system ; pear psylla ; Psylla pyricola ; Homoptera ; pear decline vector ; tissue preference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les lieux d'insertion des stylets sur la surface de la feuille et les types cellulaires consommés par les larves et les adultes de Psylla pyricola Foerster ont été précisés par étude histologique et par enregistrement électronique du comportement de piqûre et d'alimentation. Ni les larves, ni les adultes n'ont absorbé de préférence le phloème de Pyrus communis de la variété ‘Bartlett’. Nous avons constaté que le psylle du poirier ingère le contenu de tous les types cellulaires, mais que le xylème, le phloème et autre cellules des faisceaux libéro-ligneux étaient préferés aux tissus non vasculaires. La discussion a porte sur les méchanismes sensoriels éventuellement responsables de la sélection des lieux d'insertion des stylets à la surface de la feuille et l'acceptation des différents types cellulaires lors de l'ingestion.
    Notes: Abstract Stylet insertion sites on the leaf surface and leaf cell types fed upon by nymphs and adults of the pear psylla, Psylla pyricola Foerster (Homoptera: Psyllidae) were identified using histological techniques and electronic monitoring of probing and feeding activities. Neither the nymphs nor the adult ingested predominantly from the phloem of Pyrus communis cv. ‘Bartlett’. We showed that the pear psylla ingests from all leaf cell types, but that xylem, phloem and bundle sheath cells are more acceptable for ingestion than non-vascular tissues. The possible sensory mechanisms underlying selection of stylet insertion sites on the leaf surface and acceptance of various cell types for ingestion are discussed.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 57 (1978), S. 279-295 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The observational evidence on the strength of the coronal magnetic field above active regions is reviewed. Recent advances in observations and plasma theory are used to determine which data are the more reliable and to revise some earlier estimates of field strength. The results from the different techniques are found to be in general agreement, and the relation 279-01, 1.02 ≲ R/R ⊙ ≲ 10 is consistent with all the data to within a factor of about 3.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 26 (1972), S. 176-182 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of bi-polar type I storm centers with the Culgoora radioheliograph operating at 80 MHz show that in many cases they are not oriented as we should expect for emission in the ordinary mode and for the simplest magnetic field geometry. We interpret this as evidence for a twist in the magnetic field.
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