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  • 11
    Electronic Resource
    Electronic Resource
    Die Cnidogenese der Octocorallia (Anthozoa, Cnidaria): I. Sekretionund Differenzierung von Kapsel und Schlauch (1981)
    Springer
    Helgoland marine research 34 (1981), S. 463-484 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ultrastructural differentiation of capsule and its relation to tube development is described in several Octocorallia species(Alcyonaria: Alcyonium digitatum, Parerythropodium coralloides, Cornularia cornucopiae, Paralcyonium elegans; Pennatularia: Pteroeides spinosum, Veretillum cynomorium; Gorgonaria: Pseudopterogorgia aerosa), all of which have only one type nematocyst. In the Octocorallia, capsule and tube are secreted successively by the Golgi apparatus associated with a primary centriolar complex. During the secretion of the external tube, the outer capsular wall (sclera) is structurally differentiated; inside the capsule the material of the inner capsular wall is separated from the later capsular content (matrix). The primary wall differentiation enables the capsules to “grow” after capsular secretion has been completed. Following tube secretion, the external tube is completely transferred into the capsule, without the tube wall being transformed into capsular wall, as previously suggested (Westfall, 1966; Ivester, 1977). During early invagination of the tube wall, the coarse, granulated matrix of the external tube is transferred into the internal tube. From this material the spines are developed, which are observed before the tube is completely transferred into the capsule. By a secondary wall differentiation the previously structureless inner capsular wall changes to a complex structure, extending again the capsule, thus mixing the capsular content and enabling the tube to shift to a position, which corresponds with that of mature capsules. These observations demonstrate for the first time the differentiation of the capsule and its close relationship to the differentiation of the tube in nematocysts of Octocorallia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995918
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  • 12
    Electronic Resource
    Electronic Resource
    Die Cnidogenese der Octocorallia (Anthozoa, Cnidaria): II. Reifung, Wanderung und Zerfall von Cnidoblast und Nesselkapsel (1982)
    Springer
    Helgoland marine research 35 (1982), S. 97-118 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Migration of cnidoblasts has never been observed in Anthozoa. In contrast to hydrozoans, anthozoans are repeatedly reported to develop nematocysts locally without migration in the entoderm as well as in the ectoderm. The majority of the nematocysts studied in different Octocorallia species (Alcyonaria:Alcyonarium digitatum, Parerythropodium coralloides; Gorgonaria:Pseudopterogorgia aerosa; Pennatularia:Veretillum cynomorium) originate from the ectoderm of the scapus, where, however, no mature nematocysts occur. Cnidoblasts containing immature nematocysts accumulate in the distal scapus, from where they migrate singly like amoebae into the pinnulae of the tentacles. The nematocysts mature during migration, during which the capsular matrix becomes completely electron-translucent. Only in the oral disc, where few nematocysts occur, do they mature locally without migration. In the Octocorallia, nematocyst development and maturation takes places only in the ectoderm. Development of nematocysts has never been observed in the entoderm, nor in the pharynx; this demonstrates its entodermal origin. The entoderm contains only degenerated or phagocytized nematocysts. Contrary to hydrozoans, the mature anthozoan cnidocyte is rounded and has no processes to the mesogloea. Instead of a cnidocil it has a ciliary cone consisting of a normal flagellum, stereocilia and macrovilli. The cnidocyte is characterised by abundant electron-translucent cytoplasm and nematocyst-anchoring structures made up of cross-striated, collagen-like fibrillae and a fibrous basal ring. The position of the cross-striated fibrillae is distally similar to that of the supportive rods in hydrozoan cnidoblasts. The present study clearly demonstrates that structure and, possibly, function of an octocorallian cnidocyte is much simpler than that of a hydrozoan cnidocyte. On the other hand, cnidoblast migration, occurring in Hydrozoa as well in Octocorallia, turned out to be a much older phylogenetic character than was formerly believed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02289837
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  • 13
    Electronic Resource
    Electronic Resource
    Eine Röntgenkleinwinkelanalyse von Polyacrylnitril-Fasern (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 205-211 
    Details
    ISSN: 1435-1536
    Keywords: Röntgenkleinwinkel ; Polyacrylnitril ; Fasern ; Hohlraumsystem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract Measurements of the equatorial X-ray small-angle scattering are reported for 9 polyacrylnitrile fibers. They are evaluated according to Porod's theory. Data on void fraction and inner surface are obtained. With several samples, a Gumier-evaluation of the inner portion is possible, agreement is satisfactory. An attempt is made to interpret the results obtained with the help of a cyhndric model.
    Notes: Zusammenfassung Von 9 Polyacrylnitril-Fasern wird die diffuse äquatoriale Röntgenkleinwinkelstreuung gemessen und nach der Porod'schen Theorie ausgewertet, wobei Daten über den Hohlraumteil und die innere Oberfläche erhalten werden. Bei einigen Proben ist auch eine Guinier-Auswertung des Innenteils möglich; die Übereinstimmung ist gut. Es wird versucht, die Meßresultate anhand eines Zylindermodells zu interpretieren.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01465441
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  • 14
    Electronic Resource
    Electronic Resource
    Evolution of molecular states studied in collisions of ions with laser excited atoms by a crossed beam experiment (1983)
    Springer
    The European physical journal 312 (1983), S. 293-304 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential scattering cross sections in the energy rangeE CM=25–50 eV have been measured in a crossed beam machine for the scattering of Na+ by laser excited Na(32 P 3/2). The superelastically scattered ions resulting from the collisional deexcitation process 32 P 3/2-2 S 1/2 are sharply peaked at a constant reduced scattering angle of 180eV degrees. Through the choice of either linearly or circularly polarized light, one can selectively excite the magnetic sublevels of the Na atoms. This ability to align or orient the Na* allows us to discuss in considerable detail both the transition from the space-fixed (atomic) to the body-fixed (molecular) system and the dynamics in the merging region of the two frames. We find that the symmetry axis of the excited electron charge cloud is locked to the internuclear axis and hence to the body-fixed reference frame at an internuclear separation of about 35 a.u. A pronounced asymmetry of the scattering from atoms excited with LHC or RHC polarized light is discussed in terms of simple models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414056
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  • 15
    Electronic Resource
    Electronic Resource
    Neutron binding and excitation energies of some Pb isotopes (1983)
    Springer
    The European physical journal 313 (1983), S. 349-350 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Improved neutron binding and excitation energies in205, 207, 208Pb, relative to the 412 keV gold standard, have been deduced from the measurements of gamma-ray energies following thermal neutron capture. Neutron binding energies of 6,731.57(15), 6,737.76(18), 7,367.87(11) keV for205, 207, 208Pb, respectively, were determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439488
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  • 16
    Electronic Resource
    Electronic Resource
    Nuclear spectroscopic study of24Na (1983)
    Springer
    The European physical journal 313 (1983), S. 325-337 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nucleus24Na has been investigated by studying the gamma-rays emitted following thermal neutron capture in23Na, with curved crystal and Ge(Li) spectrometers. Of the 277 transitions assigned to24Na, 216 were placed in the24Na level scheme containing 45 levels, of which six (1,961, 1,977, 3,866, 5,810, 5,918, and 6,222 keV) are reported for the first time. An average gamma-ray multiplicity of 3.3 gammas per neutron capture was observed. The neutron binding energy was determined to be 6,959.73 (14) keV. The resulting level scheme is compared to shell and rotational model predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439486
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  • 17
    Electronic Resource
    Electronic Resource
    The19F(n, γ)20F reaction (1983)
    Springer
    The European physical journal 313 (1983), S. 339-347 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gamma-ray spectrum emitted following thermal neutron capture in19F has been studied with curved crystal and Ge(Li) spectrometers. From the 109 transitions assigned to20F, 85 have been placed in a level scheme containing 26 levels. An average gammaray multiplicity of 2.8 gammas per neutron capture was observed. The neutron binding energy was found to be 6601.33(14) keV. The experimental level scheme is compared to rotational model predictions. In addition it is shown that the decay of the capture state is non-statistical and that there is a strong correlation between the strengths of excitation of levels by the (n, γ) and (d, p) reactions. Calculations of the partial cross-sections using the direct capture theory of Lane and Lynn give order of magnitude agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439487
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  • 18
    Electronic Resource
    Electronic Resource
    Die Abhängigkeit der Influenzapandemie von Hochdruckwetterlage (1921)
    Springer
    Naturwissenschaften 9 (1921), S. 581-582 
    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/BF01486903
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  • 19
    Electronic Resource
    Electronic Resource
    Combined use ofβ-sympathomimetic drugs andβ-blockers during labour (1981)
    Springer
    Archives of gynecology and obstetrics 230 (1981), S. 231-237 
    Details
    ISSN: 1432-0711
    Keywords: Fenoterol-Tokolyse ; Tachykardie ; Betablocker ; Antagonisierung ; Tocolysis ; Betamimetic ; Tachycardia ; Betalytic ; Antagonism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary None of the betamimetics have an exclusively tocolytic effet. By stimulating the cardiovascular β-receptor, they also cause a substantial increase in the heart rate and a decrease in blood pressure. We administered 4–5 μg/min of Fenoterol to 13 patients during the first stage of labour. This led to complete inhibition of labour. To reduce cardiac side effects, a primarily cardiac β-blocker (5 mg Atenolol or 20 mg Metoprolol) was also given. The maternal and fetal heart rates were measured by ECG and by fetal scalp-electrode, respectively. The fetal heart rate remained largely unchanged, both during the Fenoterol infusion as well as during the additional administration of the β-blocker. The maternal heart rate, which increased under the influence of the Fenoterol, fell (p ≤ 0.01) but did not return to normal. In all cases the β-blockade led to a brief increase in uterine activity.
    Notes: Zusammenfassung Neben dem tokolytischen Effekt verursachen Betasympathikomimetika eine erhebliche Steigerung der Herzfrequenz und eine Blutdruckerniedrigung durch Stimulation der kardialen und vaskulären Betarezeptoren. Dreizehn Patienten erhielten während der Eröffnungsperiode 4–5 μg/min Fenoterol i.v. Nach vollständiger Wehenhemmung wurde wegen der unerwünschten Kreislaufreaktionen zusätzlich ein Betablocker mit vorwiegend kardialer Wirkung (Atenolol 5 mg oder Metoprolol 20 mg) verabreicht. Die Registrierung der Herzfrequenzen erfolgte über mütterliches EKG und fetale Skalpelektrode. Sowohl während der Fenoterol-Infusion als auch während der zusätzlichen Verabreichung des Betablockers änderte sich die fetale Herzfrequenz nur unwesentlich. Die Fenoterol-bedingte mütterliche Tachykardie konnte gesenkt (p ≦ 0,01), aber nicht vollständig aufgehoben werden. In allen Fällen führte die Betablockade zu einer kurzzeitigen Steigerung der Uterusaktivität.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02111808
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  • 20
    Electronic Resource
    Electronic Resource
    Retrospektive Ermittlung eines Scores zur Erfolgsvorhersage einer Harninkontinenzoperation auf Grund anamnestischer Angaben und urodynamischer Befunde (1981)
    Springer
    Archives of gynecology and obstetrics 232 (1981), S. 702-704 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429775
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