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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 44 (1972), S. 1391-1395 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 55 (1973), S. 252-262 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The current/time and voltage/time functions are derived for the principal and auxiliary arms of a self-commutated inverter as well as for its commutating capacitor. This is done at the example of the directly commutated (parallel type) inverter. The results are given as formulac as well as in figures for the different in tervals during the commutating process. Formulac for the electrical design of the components of the commutating circuit are derived.
    Notes: Übersicht Anhand des Beispiels der direkten Kommutierung werden Strom-und Spannungsverläufe in den Haupt-und Hilfszweigen des selbstgeführten Wechselrichters sowie im Kommutierungskondensator abgeleitet. Das Ergebnis wird in Formeln und Bildern für die einzelnen Zeitabschnitte des Kommutierungsvorgangs angegeben. Daraus werden Hinweise für die Bemessung des Kommutierungskreises abgeleict.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 6 (1970), S. 12-17 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ecological surveys involving over 500 man-days between 1966 and 1969 indicate that the coral-eating sea star, Acanthaster planci, is a normal component of the coral reef community throughout the tropical Pacific, and that its abundance in the past has probably been underestimated. The sea star is not uncommon in certain environments, particularly back-reef and lagoon slopes. Sheltered, inner reefs are generally preferred over less protected reefs. Recently reported “population explosions” of A. planci at Guam and on the Great Barrier Reef of Australia appear to be isolated, widely-separated, local infestations of unknown cause. The infestation on the Great Barrier Reef has not spread beyond the area off Cairns and Innisfail. Approximately 40 of the more than 1000 reefs comprising the Great Barrier Reef complex have been infested heavily.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 26 (1974), S. 353-359 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Average radial growth rates of the hemispherical aragonite colonies deposited by the Indo-Pacific scleractinian reef coral Platygyra spp. were determined by measuring the thickness of density variations in the skeleton that are revealed by X-radiography. Ninety-one specimens from 21 localities were examined, but only 54 of these exhibited well-defined growth-banding. The apparent temperature dependence of growth rate is linear over the range 23.9° to 29.3°C, averaging 5.4±0.94 mm/year at 24°C, 8.0±0.42 mm/year at 27°C, and 9.7 ±0.58 mm/year at 29°C (90% confidence limits). Expression of the influence of temperature on growth rate in terms of the Arrhenius equation yields an activation energy of 20,680 cal/mole, which is comparable to values for typical biological reactions, but is only half that reported for skeletogenesis in another reef coral, Pocillopora damicornis, on the basis of controlled incubation studies involving 45Ca uptake.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 15 (1972), S. 293-297 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Some coelenterates of the class Hydrozoa and some anthozoan coelenterates from the subclass Octocorallia secrete skeletons of calcium carbonate. Skeletal carbonates of three hydrozoans and of two octocorals were analyzed for the stable isotopes of carbon and oxygen. The results suggest that each of these coelenterates deposits CaCO3 in oxygen isotopic equilibrium with seawater, and that at least one octocoral, Heliopora, has skeletal carbon in apparent isotopic equilibrium with atmospheric CO2. Two of these coelenterates, Millepora and Helipora, are significant contributors to the construction of coral reefs. Whereas δ18O of these corals is temperature dependent, δ13C is not obviously related to temperature. The δ18O-temperature relationship is not significantly different from the oxygen isotope paleotemperature scale developed by Epstein et al. (1953). These findings contrast with numerous analyses of the carbonate in scleractinian coelenterates, which have long been reported to deposit CaCO3 skeletons whose carbon and oxygen isotopic compositions are not in equilibrium with the external sea-water environment.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 229 (1971), S. 550-551 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Schematic diagram of hydrostatic levelling system. The tilt a is -----. The instrument dimensions are: s tube length 120 m, tube diameter 1.27 cm, reservoir height 12 cm and reservoir diameter 4.6 cm. The system is filled with a low viscosity silicone fluid. Fig. 1 illustrates the system ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 11 (1972), S. 440-446 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 11 (1972), S. 59-68 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 240 (1972), S. 28-30 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For all experiments reported here the only coincidences which were recorded were those which occurred within a predetermined time A/. Coincidences may be due to excitation of both detectors by a common source or to chance. It is customary to compute the chance (accidental) coincidence rate by ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 210 (1971), S. 303-320 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Anhand von 8 Fällen mit Endometriumveränderungen bei jungen Frauen, die aufgrund der histologischen Befunde ohne Kenntnis des Alters der Patientin als Endometriumcarcinom eingestuft werden müßten, wird die Problematik in Diagnose und Therapie aufgezeigt. Sehr ähnliche morphologische Befunde gewinnen in Verbindung mit dem Alter der Patientin eine ganz unterschiedliche Aussagekraft hinsichtlich des weiteren biologischen Verhaltens der Veränderungen. Klinisch war 3mal eine einseitige Ovariektomie vorausgegangen und 3mal eine jahrelange Oestrogentherapie. Nur 3mal fand sich bei der Uterusexstirpation eine Invasion in das Myometrium als Zeichen echter Malignität. Die übrigen 5 Patientinnen waren rezidivfrei, und zwar 3 trotz rein konservativer Behandlung; 2mal war nach Uterusexstirpation die adenomatöse Wucherung auf das Endometrium beschränkt. Verschiedene histologische Kriterien, die an einem größeren Zahlenmaterial auf ihre Aussagefähigkeit überprüft werden müssen, lassen möglicherweise doch auf eine noch bestehende Reversibilität der Veränderungen sehließen. Durch subtile histologische Differenzierung wird man somit sehr wahrscheinlich die größere Zahl der jugendlichen „Endometriumcarcinome“ noch als reversible adenomatöse Hyperplasien einstufen und eine konservative Therapie bei diesen jungen Frauen vertreten können. Angesichts der Seltenheit dieser Fälle wird angeregt, diese zentral zu sammeln, um an einem größeren Untersuchungsgut gesicherte Aussagen machen zu können.
    Notes: Summary Problems in the diagnosis and therapy of endometrial tumors in eight young women are discussed. Without knowledge of the patients' age the tumors from their histology would have to be classified as endometrial carcinomas. Thus, it is apparent that these tumors, although they may resemble one another, have quite different biological behaviours and consequently prognoses, depending on the age of the patient. Three patients had had a unilateral ovariectomy; three had received prolonged therapy with estrogen. In only three patients did the tumor at hysterectomy reveal its malignant nature by having invaded the myometrium. The remaining five patients never showed recurrence of the tumor; treatment in three of these merely consisted of curettage. In two patients the hysterectomy specimen proved the adenomatous overgrowth was limited to the endometrium. Various histological criteria, which must be checked for reliability in a large series of cases, seem to indicate that the tumors are reversible. Consequently, these subtile histological characteristics enable one to classify the major portion of juvenile “endometrial carcinomas” as reversible adenomatous hyperplasias, justifying conservative therapy for these young women. Because these tumors are rare, we suggest that they be collected at a central registry, in order to learn more about their biological behaviour and their prognosis.
    Type of Medium: Electronic Resource
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