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  • 1
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary It has been shown in Drosophila melanogaster that when 50 or fewer sperm are stored in the female, some 58% are found in the spermathecae and 42% in the ventral receptacle. When between 51 and 100 are stored, some 34% are found in the spermathecae and 66% in the ventral receptacle. The more commonly encountered distribution of 10–20% in the spermathecae and 80–90% in the ventral receptacle hold for higher levels of insemination (greater than 100 sperm). The reason for the relatively high proportion of sperm stored in the spermathecae when the total number of sperm stored is small is unknown. It is pointed out that in experiments dealing with sperm: progeny ratios, careful counting of sperm in the spermathecae becomes of critical importance, especially at low levels of insemination.
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  • 2
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Experiments were carried out to determine the number of sperm transferred by the maleDrosophila after X-irradiation. Acute doses (1000 r/min) of 5,000 r, 25,000 r and 50,000 r delivered to the male results in reductions of some 20–25%, 60–65%, and 85–90%, respectively, in the number of sperm scored in the ventral receptable of inseminated females. It appears, further, that sperm in ejaculates of relatively small size (50 or fewer) from irradiated as well as unirradiated males distribute themselves such that 20–50% or more found in the spermathecae. The bearing of this observation on the apparent 1:1 sperm: progeny ratio reported byPeacock andErickson (1965) from ejaculates with low sperm number is noted.
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  • 3
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Progeny: sperm ratios (P/S) were determined from crosses ofSD/cn bw males ofDrosophila melanogaster with females of eight different genotypes. Thek value was about 1.0. P/S ratios of 0.88, 0.81, and 0.76, respectively, were observed from crosses with females of three genotypes, and ratios in the 0.3–0.4 range from five. These results support the suggestion ofZimmering & Fowler (1968) that P/S ratios may vary widely and depend at least in part on the genotype of the female. Morcover, since P/S ratios of 0.9 may be observed whenk is about 1.0, it follows that the vast majority of sperm stored in these females areSD.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 4 (1972), S. 57-59 
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les calcifications gyriformes spontanément visible sur les radiographies du crâne et les données pneumo-encéphalographiques tout à fait superposables à celles d'une maladie de Sturge-Weber sont décrites chez un enfant dans les suites d'une encéphalite. Le patient ne présentait aucune des manifestations cutanées d'angiomatose encéphalo-trigéminée.
    Abstract: Zusammenfassung Nach einer akuten Encephalitis traten bei einem Kind gyriforme Verkalkungen auf, die sich auf den Nativ-Aufnahmen und bei der Encephalographie nachweisen ließen. Anzeichen eines Sturge-Weber-Syndroms lagen nicht vor.
    Notes: Summary Gyriform calcifications on the plain skull film and pneumoencephalographic findings indistinguishable from Sturge-Weber disease are reported in a child following an acute encephalitis. The patient has none of the cutaneous manifestations of encephalotrigeminal angiomatosis.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Neuroradiology 4 (1972), S. 159-161 
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs rapportent un cas de calcifications de l'hippocampe visibles radiologiquement chez un patient présentant des crises convulsives, un retard intellectuel et des taches café-au-lait, mais sans manifestation cutanée de protéinose lipoïdique. Ils pensent qu'il s'agit d'une entité différente de la protéinose lipoïdique et émettent la théorie selon laquelle les calcifications peuvent être secondaires á un traumatisme par anoxie lors de la naissance ou concomittant avec les crises convulsives.
    Abstract: Zusammenfassung Es handelt sich um eine Fallbeschreibung eines 3 jährigen Kindes, bei dem die Röntgenaufnahmen bilaterale Verkalkungen in der Hippocampus-Region zeigten. Bei der Pneumoencephalographie fiel eine Ventrikelerweiterung mit besonderer Erweiterung beider Temporalhörner auf. Bei dem Patienten bestanden Anfälle und eine psychische Retardierung.
    Notes: Summary A case of radiographic hippocampal calcification is reported in a patient with seizures, mental retardation, and cafe-au-lait spots, but without the cutaneous manifestations of lipoid proteinosis. We feel this is an entity distinct from lipoid proteinosis and theorize that the calcifications may be secondary to injury from anoxia at birth or concomitant with seizures.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 9 (1981), S. 271-273 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a density dependent quark mass to express non-perturbative interaction effects, we calculate the critical density for a phase transition between nuclear and quark matter atT=0.
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  • 8
    ISSN: 1435-604X
    Keywords: Photodynamic therapy ; Superficial bladder tumours ; Dosimetry ; Isotropic light sensors ; Photosensitizers ; Wavelength of irradiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics , Technology
    Notes: Abstract The use of photodynamic therapy (PDT) for the treatment of superficial tumours on the bladder wall is described. Details are given on the laser, methods of delivering light into the bladder, suitable commercial dosimetry systems and instrumentation suitable for making light measurements on the bladder wall during therapy. New alternative photosensitizers are discussed in some detail. Some early clinical results are presented and the current problems with this type of therapy are highlighted.
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