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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Relative Humidity on Hatching and on Toxicity of Ovicides to Eggs of the Red Spider Mite, Tetranychus telarius (L.) (Acarina : Tetranychidae) (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 409-409 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In connexion with biological and toxicological studies in this laboratory on eggs of T. telarius it has been found convenient to induce mites to lay eggs on glass slides. This has made it possible to make an accurate study of the effects of relative humidity. By holding eggs in a particular ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186409a0
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolism of Ribonucleic Acid in the Endometrium of the Rabbit during Early Pregnancy (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 890-892 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Phosphate ions are known to be taken up more quickly by the endometrium of pregnant rabbits between the third and the fifth days after mating. It has now been shown that this increase in the amount of phosphate is accompanied by a marked increase in the rate of synthesis of RNA over the same period ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214890a0
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic and biochemical comparisons of organophosphate resistance between strains of spider mites (Tetranychus species: Acari) (1967)
    Springer
    Entomologia experimentalis et applicata 10 (1967), S. 231-239 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Ergebnisse genetischer und biochemischer Untersuchungen der Resistenz gegenüber Parathion an Stämmen von Tetranychus urticae Koch werden dargestellt. In die Untersuchung waren sowohl der wohl bekannte Leverkusener R-Stamm als auch zwei resistente Stämme von Neuseeland einbezogen. Im toxikologischen Teil der genetischen Untersuchungen wurde eine topische Applikationstechnik angewendet. Genetisch wie biochemisch scheint die Resistenz der zwei voneinander unabhängigen Neuseeländer Stämme mit der Resistenz des Leverkusener Stammes identisch, d.h. von dem gleichen dominanten Hauptgen verursacht zu sein, welches die Hemmungsrate der Cholinesterase-Enzyme senkt. Bemerkungen über die universelle Bedeutung dieses grundlegenden Resistenzmechanismus werden angefügt.
    Notes: Abstract The results of genetic and biochemical studies of resistance to parathion in strains of Tetranychus urticae are presented. Included in the study is the well-known Leverkusen-R strain, as well as two resistant strains from New Zealand. For the toxicological part of the genetic investigation, a topical application technique is employed. Both genetically and biochemically, the resistances of the two independent New Zealand strains appear identical to the Leverkusen resistance, viz., due to the same major dominant gene which lowers the inhibition rate of the cholinesterase enzyme. Comments are made upon the universal significance of this basic resistance mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302244
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  • 4
    Electronic Resource
    Electronic Resource
    Selection of solvents for topical application acaricide testing (1968)
    Springer
    Entomologia experimentalis et applicata 11 (1968), S. 389-396 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La recherche d'une gamme de solvants pour les essais d'acaricide sur acariens par application locale a montré que le choix est limité par le pouvoir dissolvant, la viscosité et la toxicité. L'acétophénone et l'anisole se sont révelés des solvants utilisable mais l'acétophénone est apparue avoir un faible pouvoir mouillant qui provoque une variabilité dans les valeurs de la DL50 de l'acaricide par rapport à d'autres solvants dans les essais sur Tetranychus urticae Koch.
    Notes: Abstract Investigation of a range of solvents for topical application acaricide tests on mites indicated that the choice was limited by solvent power, viscosity and toxicity. Acetophenone and anisole proved useful solvents but acetophenone appeared to have poor wetting power which caused variability in acaricide LD50 levels compared with other solvents when tested on Tetranychus urticae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364570
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray emission associated with solar prominences, sprays and surges (1988)
    Springer
    Solar physics 116 (1988), S. 61-82 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using Hα observations made at the Astronomical Observatory of Wroclaw University, and 3.5–5.5 keV X-ray data from the Hard X-ray Imaging Spectrometer on board the Solar Maximum Mission, sites of solar X-ray emission are identified which are associated with active Hα features, such as prominences, sprays and surges. The X-ray emission is found to be highly localized within the active (Hα) structures. For example, in the prominences examined, 3.5–5.5 keV X-rays were found only in compact sites near the feet of the prominences. Models predicting that, during the active phase of these structures, the energy release should be evenly distributed along the structure are clearly brought into question. It is argued that these X-ray sites are indicative of the cause of the expulsion and transport of chromospheric material. Models which satisfy these observations are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171715
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  • 6
    Electronic Resource
    Electronic Resource
    HIGH-RESOLUTION OBSERVATIONS OF THE EXTREME ULTRAVIOLET SUN (1997)
    Springer
    Solar physics 170 (1997), S. 123-141 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents first results of the Coronal Diagnostic Spectrometer (CDS) recently launched aboard the Solar and Heliospheric Observatory (SOHO). CDS is a twin spectrometer, operating in the extreme ultraviolet range 151–785 Å. Thus, it can detect emission lines from trace elements in the corona and transition region which will be used to provide diagnostic information on the solar atmosphere. In this paper, we present early spectra and images, to illustrate the performance of the instrument and to pave the way for future studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004913326580
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  • 7
    Electronic Resource
    Electronic Resource
    FLOWS AND DYNAMICS IN THE CORONA OBSERVED WITH THE CORONAL DIAGNOSTIC SPECTROMETER (CDS) (1997)
    Springer
    Solar physics 170 (1997), S. 163-177 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract EUV spectra obtained with the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) show significant flows of plasma in active region loops, both at coronal and transition region temperatures. Wavelength shifts in the coronal lines Mgix 368 Å and Mgx 624 Å corresponding to upflows in the plasma reaching velocities of 50 km s-1 have been observed in an active region. Smaller velocities are detected in the coronal lines Fexvi 360 Å and Sixii 520 Å. Flows reaching 100 km s-1 are observed in spectral lines formed at transition region temperatures, i.e., Ov 629 Å and Oiii 599 Å, demonstrating that both the transition region and the corona are clearly dynamic in nature. Some high velocity events show even higher velocities with line profiles corresponding to a velocity dispersion of 300–400 km s-1. Even in the quiet Sun there are velocity fluctuations of 20 km s-1 in transition region lines. Velocities of the magnitude presented in this paper have never previously been observed in coronal lines except in explosive events and flares. Thus, the preliminary results from the CDS spectrometer promise to put constraints on existing models of the flows and energy balance in the solar atmosphere. The present results are compared to previous attempts to observe flows in the corona.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004945702259
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  • 8
    Electronic Resource
    Electronic Resource
    First Observations of Coronal Hole Structure and Evolution Using Soho-Cds (1997)
    Springer
    Solar physics 175 (1997), S. 437-456 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on initial observations of coronal holestructure and evolution by the Coronal Diagnostic Spectrometer (CDS) instrument on board the Solar and Heliospheric Observatory (SOHO). The data show that there is coronal activity on time scales of tens of minutes, manifested as brightenings at chromospheric network cell junctions in extreme ultraviolet (EUV) wavelengths. There are also significant differences in structure seen in different wavelengths in coronal holes. Finally, we show coronal hole EUV spectra and compare them to quiet-Sun spectra, also taken by CDS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004930219222
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  • 9
    Electronic Resource
    Electronic Resource
    High-Velocity Flows in an Active Region Loop System Observed with the Coronal Diagnostic Spectrometer (Cds) on Soho (1997)
    Springer
    Solar physics 175 (1997), S. 511-521 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract EUV spectra of coronal loops above an active region show clear evidence of strong dynamical activity. We present an example where the Ov 629 Å line, formed at 240 000 K, is shifted from its reference position corresponding to line-of-sight velocities greater than 50 km s-1 with the shift extending over a large fraction of a loop. The observations were made with the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO), and are from active region NOAA 7981 on the east solar limb on 27 July 1996. An animation has been prepared showing the variation of the shift or flow velocity along the loop. This animation is to be found on the enclosed CD-ROM and gives a clear impression of the dynamical condition present in the loop. The appearance of the loop system in different lines formed over a range in temperature as well as the observed dynamics indicates that loops at different temperatures are not closely co-located. Finally, the results are discussed and related to mechanisms that may cause line shifts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004950330900
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  • 10
    Electronic Resource
    Electronic Resource
    Euv Spectroscopy of the Sunspot Region Noaa 7981 Using Soho – I. Line Emission and Time Dependence (1998)
    Springer
    Solar physics 179 (1998), S. 43-74 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract EUV spectra of a medium-size sunspot and its surroundings, NOAA 7981, were obtained on 2 August 1996 with the Coronal Diagnostic Spectrometer (CDS) and the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on the Solar and Heliospheric Observatory (SOHO). The spectral lines formed in the transition region and corona show considerable structure and large deviations from a uniform spatial distribution over the active region. Enhanced EUV emissions in transition region lines are concentrated in small regions outside the umbra of the sunspot throughout most of the observing sequence. Only during a short, active period do we find an enhanced line emission that reaches into the umbra. Preliminary values for the umbral intensity are given. Marked changes are detected between the spatial distribution of line emission in the transition region and the low corona. The difference is not limited to cool and hot non-flaring loops not being cospatial, but includes differences both regarding the time variability and the orientation and size of the emission features. Whereas both rapid (≈ 4 and 2 min) and slow (≈ 10 and 12 h) temporal variations are found in the chromosphere (Hei 584 Ú) and transition region (Ov 629 Ú), the response in the low corona (Mgix 368 Ú) is slow (≈ 5 h). Furthermore, marked differences between the spatial distributions in the Mgviii 315 Ú, Mgix 368 Ú lines formed in the low corona and the coronal Fexiv 334 Ú, Fexvi 360 Ú lines are detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005003407826
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