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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 29 (1910), S. 287-289 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Der Temperaturkoeffizient für die Lebensdauer vonTubularia crocea wurde für das Temperaturintervall 36°−25° C. bestimmt. Es wurde gefunden, daß derselbe etwa 2 für einen Temperaturunterschied von 1° beträgt. Das ist derselbe Temperaturkoeffizient, denLoeb für die Lebensdauer der Seeigeleier für das Temperaturintervall 32°−20° C. gefunden hat.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 29 (1910), S. 354-362 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 34 (1912), S. 168-175 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1) Es fand sich, daß der Entwicklungsbetrag der Dominantencharaktere in Körpergestalt und Skeletbildung bei Seeigellarven für den Heterozygoten geringer ist als für den reinen Dominanten. 2) Die Aufmerksamkeit wird auf die Tatsache gelenkt, daß in dem Falle der vonLang untersuchten Schnecken der Entwicklungsbetrag der Dominantenfarbe beim Heterozygoten geringer ist als beim reinen Dominanten. 3) In übereinstimmung mit unsrer Hypothese, daß die der Bildung von Dominantencharakteren unterworfenen Substanzen den Gesetzen gehorchen, welche die Enzymreaktionen beherrschen, sollten wir erwarten, daß diese Reaktionen beim Heterozygoten mit geringerer Geschwindigkeit vor sich gehen als beim reinen Dominanten, weil der erstere nur die Hälfte soviel Enzym enthält. wie im andern zu finden ist.
    Notes: Summary 1) It has been found that the rate of development of the dominant characters of body shape and skeleton formation in sea urchin larvae, is less in the heterozygote than in the pure dominant. 2) Attention is called to the fact that in the case of snails investigated byLang the rate of development of the dominant color is less in the heterozygote than in the pure dominant. 3) According to our hypothesis that the substances underlying the formation of dominant characters obey the laws governing enzyme reactions, we should expect these reactions to go forward at a slower rate in the heterozygote than in the pure dominant because the former contains but one half the amount of enzyme to be found in the latter.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 29 (1910), S. 146-149 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Aus den vorstehend geschilderten Versuchen ergibt sich klar der Schlu\, da\ der Temperaturkoeffizient für den Regenerationsproze\ beiTubularia crocea sich innerhalb der von dem Gesetz vonvan 't Hoff undArrhenius für chemische Reaktionen verlangten Grö\en bewegt.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Development genes and evolution 37 (1913), S. 433-439 
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1) InLoebs Methode heterogener Bastardierung bei Echinodermen wird nur das Sperma vonAsterias ochracea von dem hyperalkalischen Seewasser beeinflußt. 2) Die Befruchtung der Eier vonStrongylocentrotus purpuratus durch das Sperma vonAsterias ochracea kann in normalem Seewasser bewerkstelligt werden, wenn man nur dafür sorgt, daß die Eier zuerst durch eine 4–5 Minuten lange Behandlung mit 3/8 M SrCl2-Lösung sensibilisiert werden. 3) Werden die Eier unmittelbar nach der Befruchtung für eine kurze Zeit mit hypertonischem Seewasser behandelt, so wird die Lebenskräftigkeit der Blastulae sehr gesteigert, und ließ man diese Behandlung 15–40 Minuten andauern, so entwickeln sie sich zu Pluteis.
    Notes: Summary 1) InLoeb's method of heterogeneous hybridization in echinoderms, theAsterias ochracea sperm alone is affected by the hyperalkaline sea water. 2) The fertilization ofS. purpuratus eggs byAsterias ochracea sperm may be brought about in normal sea water, provided the eggs are first sensitized by a 4–5 minute treatment with 3/8 M SrCl2 solution. 3) If immediately after fertilization, the eggs are treated for a short time with hypertonic sea water, the vigor of the blastulae is much enhanced, and in case the treatment has lasted 15–40 minutes, they develop into plutei.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 9 (1929), S. 74-81 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The common salamander of the Pacific coast, Triturus torosus, responds stereotropically to excitation of the dorsal and lateral surfaces of the body, head and tail. Contact stimulation of the ventral surface is without effect except when applied between the pairs of legs. It is here only that negative as well as positive stereotropic reactions are displayed, positive with weak, negative with strong stimulation. The amputated tail constitutes a preparation which reacts to contact, bending actively toward the point touched. If the skin is removed the reaction fails, or if the nerve cord of the tail be destroyed with a bristle the reaction likewise is destroyed. This proves that stereotropism in the preparation is the result of typical spinal reflexes. The constant electric current when applied to the dorsal part of the body causes characteristic muscle tension effects shown in opisthotonus and constant movement of the tail with ascending current; opisthotonus of the head with descending current. The amputated tail preparation shows undulatory movement with the ascending, quiescence with the descending current. These effects persist even after the skin has been removed, but fail when the nerve cord of the tail is destroyed. This proves that the locus of the action of the current in galvanotropism is on the cells of the nerve cord. The minimal current necessary to produce the galvanotropic reaction is 0.1 Ma. If we assume that the current is conducted equally through the tissue this means that each motor nerve cell stimulated, assuming the diameter of such a cell to be 25 μ, will be subject to an ionic movement to the extent of 3×109 ions per second.
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  • 7
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The calculation of the space-charge density under illumination from surface photovoltage measurements has been adapted to analyze light-soaking experiments in intrinsic hydrogenated amorphous silicon (a-Si:H). We find that the positive space-charge densities increase and the space-charge widths decrease with light exposure while very little change occurs in the hole diffusion length. These results indicate that changes in electric field distribution with light soaking are important causes of degradation of amorphous silicon solar cells, rather than changes which may ocur in the hole diffusion length. We also review and discuss results of others regarding application of the surface photovoltage (SPV) to study light-induced phenomena, evidence of two different types of light-induced defects, and potential limitations of SPV in a-Si:H.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 11 (1988), S. 0 
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 13 (1990), S. 0 
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4816-4819 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two modifications in the method of determining diffusion length in a-Si:H films by surface photovoltage are presented; one calculational, the other experimental. In the calculation a known theory together with data at three dc-bias light levels are used to compute the correct diffusion length, as well as the space-charge density at all light levels. Experimentally, provision for illuminating a thin sample with blue light from the rear in addition to the normal red and monochromatic light from the front serves to eliminate the disturbing effect of a back surface barrier. The improved results are illustrated.
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