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  • 1
    Electronic Resource
    Electronic Resource
    Separation of isobaric elements by the energy-loss dispersion in carbon absorber foils
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 124 (1975), S. 607-608 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-554X(75)90619-9
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear charge distribution of mass-separated isobars from thermal-neutron-induced fission of ^2^3^5U
    Amsterdam : Elsevier
    Nuclear Physics, Section A 247 (1975), S. 74-90 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear fission
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(75)90278-X
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  • 3
    Electronic Resource
    Electronic Resource
    A comparative study of nuclear proteins in chick embryo cells and their primary and secondary fibrobasts in culture (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 280-282 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Das elektrophoretische Muster von Histonen und sauren Zellkernproteinen von Hühnerembryonen und deren primären und sekundären Fibroblastzellen wurde qualitativ und quantitativ verglichen. Die Zellkernproteine der verschiedenen Zelltypen erwiesen sich qualitativ als identisch, die relative quantitative Verteilung der Kernproteine war jedoch leicht verschieden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01926475
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  • 4
    Electronic Resource
    Electronic Resource
    Lathyrism and 7,12-Dimethylbenzanthracene-induced Carcinoma in the Rat (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 310-311 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] 50-day-old female Sprague-Dawley rats were given a purified diet with or without addition of 0-5 per cent BAPN. 20 mg 7,12-dimethylbenzanthracene in sesame oil was administered intragastrically at the beginning of the experiment in a single dose3. The time of induction, rate of growth and number of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207310b0
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  • 5
    Electronic Resource
    Electronic Resource
    The influence of pairing and nuclear structure on the thermal-neutron-induced fission of235U (1975)
    Springer
    The European physical journal 274 (1975), S. 203-213 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass separated fission product beam provided by the mass separator “Lohengrin” has been used to determine the nuclear charge distribution for the thermal-neutron-induced fission of235U for all light fission products in the region 80≦A≦107. The measurements were performed at the most probable kinetic energy of the fission products. By using the known fission product mass yields, the independent yields for a total number of 100 nuclides were obtained under the condition of the most probable kinetic energy. The proton pairing effect modulates the average nuclear charge of the fission fragments and the isobaric charge distribution widths in a regular fashion. The probabilities of breaking a pair and of forming fragments with an energetically unfavourable neutron-to-proton ratio are found to compete with each other. Both probabilities depend on the mass split and reach their maximum values in the region of the most probable masses. The odd-even-proton effect is found to vary smoothly between 16% for the most abundant mass splits and 40% for the rare mass splits. The odd-even-neutron effect exhibits maxima nearN=50 andN=60, where it reaches 16%. These maxima and the extremely low Tcyield (0.13±0.05%) are discussed with regard to fragment shell effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437731
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  • 6
    Electronic Resource
    Electronic Resource
    Flight of the honey bee (1989)
    Springer
    Journal of comparative physiology 158 (1989), S. 729-737 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary From measurements of gas exchange of single tethered bees flying in a closed-circuit miniature respiration wind tunnel atRQ=1.0, a relative metabolic power (relative metabolic rate) ofP mrel=0.515±0.1W g−1 was calculated based on a body mass of 80 mg for an ‘empty’ bee. This did not vary significantly over the temperature range 25.3°C≤T a≤34.0°C, but was significantly lower atT a=20°C. Over the range 22°C≤T a≤26°CP mrel was 0.379±0.07 W g−1. Relative metabolic powerP m rel was calculated from round-about or wind tunnel post-flight thorax cooling rates (exponentially rising from 1 to 5.5°C min−1 per °C temperature difference at wind velocities from 0 to 4.3 m s−1) and from differences between thorax surface temperature and ambient temperature (exponentially decreasing from 6 to 1°C over the same range of wind velocities). A value ofP mrel=0.195±0.09W g−1 was found, independent of wind velocity. From measurements of exhaustion flights of defined fed bees executing prolonged flights (30.6±4.7 min) in front of an open-jet wind tunnel, a relative metabolic power of 0.309±0.05 W g−1 was calculated, which did not vary significantly over the temperature range 25°C≤T a≤35°C, but was significantly lower atT a=20°C. Our data from 3 experimentally different determinations ofP mrel are compared to data from a number of literature sources. A critical discussion suggests probable values of approximately 0.3 W g−1 for tethered flights (round-abouts, wind-tunnels), 0.4 W g−1 for medium speed free-foraging flights, and 0.5 W g−1 for hovering flight. Probable mechanical flight power for a muscle efficiency of 0.2 in medium speed free-foraging flight is approximately 70 mW g−1 body mass (equivalent to 5.6 mW for an ‘empty’ 80 mg bee) and 230 mW g−1 flight muscle mass. This is in the upper range of theoretical calculations, but not excessively high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693011
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  • 7
    Electronic Resource
    Electronic Resource
    Flight of the honey bee (1989)
    Springer
    Journal of comparative physiology 158 (1989), S. 711-718 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In round-about experiments (rate of success 40%) 80% of the bees began flying after thorax surface temperature had increased toT ts=34.1±1.8°C (warming). The starting temperature difference ΔT ts(=T ts−T a)=6.7±3.06 °C at an ambient temperature of 18.0°C≤T a≤29.6°C (‘normal starts’). The latter decreased to 2.80±0.83°C after 2–5 min and remained constant during 85% of the flight time (42.5±29.2 min) (Fig. 1A). 20% of the bees began flying at ΔT ts=1.6±0.3°C and continued to warm up during the first third of their flight (‘emergency starts’) (Fig. 1 B). During slowT a changes ΔT ts remained constant. Immediately after a flight stop, temperature increased by 6.2–18.7% during the following 30–60 s (‘out effect’) (Fig. 1C). Dangling the legs resulted in a pronounced temperature loss ofT ts≤1°C (Fig. 1 D). ΔT ts was negatively correlated withT a at the start (ΔT ts (°C)=88.32e−0.0926 Ta(°C); Fig. 2A), but not correlated toT a during the flight at 20.5°C≤T a≤26.7°C andv=0.72 ms−1 (Fig. 2B). Individual variation was high (Fig. 2C). Flight duration was not correlated toT a (Fig. 2D). During wind tunnel flights (rate of success 16–38%) ΔT ts reached a steady value after 2–5 min, remained steady during two thirds of the flight, and was not dependent onT a (Fig. 3C). The mean value of ΔT ts was 2.16±0.30°C at 19°C≤T a≤34°C andv=1.8 ms−1. Heating constants in still air before short walks, longer walks (t≥4 min) and round-about flights were 2.28±0.86 min−1, 3.55±1.33 min−1 and 3.64±0.73 min−1, respectively, but only 1.04±0.26 min−1 under wind tunnel conditions (resting, but exposed to a wind speed of 1.8 m s−1). Cooling constants after flight stop averaged 0.87±0.24 min−1 in still air, 2.8±0.2 min−1 in animals rotated at 0.72 m s−1, and 1.32±0.22 min−1 in animals exposed to a wind speed of 1.8 m s−1. No statistical difference in heating and cooling constants were found in the temperature range 18°C≤T a≤34°C. A significant positive correlation was found between ΔT ts and $$\dot V_{O_2 }$$ in resting bees exposed to a wind speed of 1.8 m s−1 (Fig. 4A-C).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693009
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  • 8
    Electronic Resource
    Electronic Resource
    7-Keto-5β-ätiansäure-Derivate. Über Gallensäuren und verwandte Stoffe, 51. Mitteilung (1958)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 41 (1958), S. 1206-1233 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Abbau der Seitenkette in Cholsäure bis zur Methylketon-Stufe wird beschrieben. Ausgehend von 3α, 12α-Dihydroxy-7α-acetoxy-5β-pregnan-20-on (XX) wurden die Pregnan-Derivate XXIV, XXV, XXVII, XXVIII, XXXI, XXXIII und XXXIV synthetisiert. Die Herstellung des 12-Keto-ätiansäureesters XXII erfolgte aus XXV mit Hilfe der Haloformreaktion. Dieser Ester diente als Ausgangsmaterial für die Synthese von 3α-Acetoxy-7-keto-ätiansäure-methylester (XLVIII) und 7-Keto-ätiansäure-methylester (VIII) mit gesicherter Konfiguration. Der letztere wurde auf zwei Wegen erhalten. Sowohl VIII wie XLVIII erwiesen sich als identisch mit den von LARDON auf anderem Weg hergestellten Präparaten. Im Laufe dieser Synthese wurde beobachtet, dass die Verseifung der 7α-Acetoxy-Gruppe in XXIII und XL zu zwei isomeren Hydroxy-ketoestern führt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19580410507
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  • 9
    Electronic Resource
    Electronic Resource
    Derivate der 5β,8α-Ätiansäure. Über Gallensäuren und verwandte Stoffe, 52. Mitteilung (1958)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 41 (1958), S. 1234-1246 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Verseifung der 7α-Acetoxy-Gruppe in I und VIII wurden zwei isomere Hydroxy-ketoester III und V bzw. X und XI erhalten. Von diesen stellt das eine Isomere das normale Verseifungsprodukt mit 8β,9α-Konfiguration dar, indem es durch Acetylierung das Ausgangsmaterial und durch Dehydrierung VI bzw. XII gab. Die isomeren Verseifungsprodukte V und XI gaben durch Dehydrierung Ketone VII und XIII, die sich von VI und XII durch Isomerie an C-8 unterscheiden. Das Letztere konnte dadurch bewiesen werden, dass die normalen Ketone (mit 8β-Konfiguration) durch Behandlung mit Lauge teilweise in die isomerisierten Ketone übergingen. Der Mechanismus der Umlagerungen und die dadurch bedingten stereochemischen Veränderungen werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19580410508
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  • 10
    Electronic Resource
    Electronic Resource
    Reduktion von Ätiadien-(7,9)-on-(12)-säure-estern. Gallensäuren und verwandte Stoffe, 53. Mitteilung (1958)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 41 (1958), S. 1247-1253 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Im Zusammenhang mit der voranstehenden Arbeit (2) wurde die Synthese von 3,12-Diketo-5β-ätien-(8)-säure-methylester versucht. Die Dehydrierung von 3α,7α-Diacetoxy-12-keto-5β-ätiensäure-methylester (I) mit SeO2 gab das α,β-ungesättigte Keton II, das bei der alkalischen Verseifung das konjugierte Dien-on VI lieferte. Dieses ging durch Reduktion mit Zn in Eisessig in das α,β-ungesättigte Keton IX über. Das Produkt der 1,4-Addition konnte nicht erhalten werden. VI liess sich durch Oxydation mit CrO3 in Aceton in VII überführen, das bei der Reduktion mit Zn in Eisessig oder mit Al-Amalgam in feuchtem Äther das α,β-ungesättigte Keton VIII lieferte. Auch hier konnte das angestrebte Produkt der 1,4-Addition X nicht isoliert werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19580410509
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