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  • Articles  (33)
  • Springer  (33)
  • 1975-1979  (33)
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  • Articles  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Thermal analysis of ammonium nitrate by energy-dispersive X-ray diffraction (1978)
    Springer
    Journal of thermal analysis and calorimetry 13 (1978), S. 275-281 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Le nitrate d'ammonium était chauffé et refroidi pas à pas dans un four fixé sur un goniomètre de rayons X. A chaque température, des diagrammes de diffraction étaient mesurés par un détecteur semiconducteur, combiné avec un sélecteur multicanaux. Les résultats supportent l'existence d'une phase IF. Ils montrent, que la transition des modifications IV/III procède par une phase de transition, qui ressemble à la phase II'.
    Abstract: Zusammenfassung Ammoniumnitrat wurde in einer Hochtemperaturkammer auf einem Röntgengoniometer schrittweise aufgeheizt und abgekühlt. Bei jeder Temperatur wurde ein Beugungsdiagramm aufgenommen mit einem Si-Li-Detektor und angeschlossenem Vielkanalanalysator. Die Ergebnisse unterstützen die Annahme einer Phase II'. Sie zeigen, daß die Phasenumwandlung IV/III über einen Übergangszustand verläuft ähnlich oder identisch mit der Phase II'.
    Notes: Abstract Ammonium nitrate was heated and cooled in consecutive steps in a high temperature device mounted on a X-ray goniometer. Diffraction patterns were measured at each temperature, using a Si-Li detector together with a multichannel analyzer. The results strongly support the existence of a phase II'. They show that the phase change IV/III goes via a transition state similar to or consistent with phase II'.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912300
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic moments of the 11/2− states in145, 147, 149Eu and paramagnetism in the system EuSm (1979)
    Springer
    The European physical journal 290 (1979), S. 227-228 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The g-factors of the 11/2− states in145, 147, 149Eu were measured by the TDPAD method in metallic Sm-targets. The temperature dependence of the paramagnetism in the system145EuSm follows strictly a Curie-Weiß law Beff=B0[1+¯C/(T-θ)] with C=−50(2)K and θ=−29(5)K. Extrapolation to T→∞ yields g(145Eu)=+1.356(8), g(147Eu)=+1.28(1) and g(149Eu)=+1.27(5). In addition, the quadrupole coupling constantν Q=12.5(5) MHz, and a lower limit for the paramagnetic relaxation time τ = 1 us was determined at room temperature for the 11/2− state of145Eu in Sm. Extensive studies of the anomaly of magnetic moments in the vicinity of the closed neutron shells N=50 and N=126 have unambiguously revealed an anomaly of the proton gl factor of δgl≈0.1 [1]. In the present letter we report on a similar investigation for the closed neutron shell N=82. For this purpose the g-factors of the first excited 11/2− states in the rare earth isotopes145, 147, 149Eu were measured. Due to paramagnetic effects, a measurement of nuclear g-factors in the rare earth region requires the investigation of the paramagnetic behaviour of the probe atoms in the chosen target material. The g-factors in145,147,149Eu were measured by the method of the time differential perturbed angular distribution (TDPAD) of the deexcitationγ-rays. The 11/2− states in145Eu(EX=716 keV, T1/2=0.49 gms) and in149Eu(EX=497 keV, T1/2=2.43 μs) were populated and aligned by the nuclear reaction144,148sm(d,n)145,149Eu with the pulsed deuteron beam (Ed=11 MeV) of the Erlangen tandem accelerator. Enriched metallic Sm targets of 89%144Sm and 95%148Sm were used. The 11/2− state in147Eu(EX=625 keV, T1/2=0.77 μs) was excited by the reaction147Sm(p,n)147Eu with a pulsed proton beam (Ep=10 MeV) using a 93% enriched147Sm target. A detailed description of the experimental set-up and the evaluation procedure for the present TDPAD measurements is given in ref. [2]. The deexcitation γ-rays of the isomeric Eu states were detected by two NaJ(T1) detectors encompassing an angle of Δθ=90°, and placed in a plane perpendicular to the external applied magnetic field direction. The magnetic field was calibrated by measuring the very precisely known g-factor of the isomeric 5/2+ state of19F in a BaF2 target. The Sm targets were mounted either in an oven for the high-temperature measurements or into a copper cooling-rod for temperatures down to liquid nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408118
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  • 3
    Electronic Resource
    Electronic Resource
    The magnetic moment of the first excited state in138La (1979)
    Springer
    The European physical journal 291 (1979), S. 49-52 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theg-factor of the first excited state in the odd-odd nucleus138La (E x=73 keV,I π,T 1/2=116 ns) was measured by the time-differential perturbed angular distribution (TDPAD) method. The result, corrected for Knight shift and diamagnetic shielding, isg=+0.962±0.016. This value can be fairly well reproduced using the additivity relation for magnetic moments, empirical values for the odd-proton and odd-neutrong-factors, and an experimentally deduced wave function for the 3+ state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415816
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  • 4
    Electronic Resource
    Electronic Resource
    HCG-insensitivity of the postnatal rat ovary is due to the lack of a specific receptor (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 689-690 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rat ovary is insensitive to luteinizing hormone and human chorionic gonadotrophin till to the 8th to 10th day of postnatal development. This insensitivity is due to the lack of a specific hormone receptor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946579
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  • 5
    Electronic Resource
    Electronic Resource
    The reduction of genic activity in the tetraploid amphibianOdontophrynus americanus is not due to loss of ribosomal DNA (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 27-28 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Genic activity in tetraploid members of the amphibian speciesOdontophrymus americanus is reduced to that of diploid ones. Loss of ribosomal genes, a mechanism suggested by others as a means of decreasing genetic activity, could be ruled out. The diploids and the tetraploids have almost identical proportions of their genomes complementary to (28s+18s) ribosomal RNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01932605
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  • 6
    Electronic Resource
    Electronic Resource
    Adrenalectomy, ovarian HCG-binding and the onset of female puberty in the rat (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1394-1396 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The delay of puberty onset in female rats adrenalectomized before the 25th day of age is due neither to changes in the number of ovarian HCG-receptors nor to an altered hormone affinity of these receptors. It is assumed that glucocorticoids act on an intracellular level, in the ovarian cells, possibly by alterations of cyclic AMP-dependent phosphodiesterase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920202
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  • 7
    Electronic Resource
    Electronic Resource
    Ovarian HCG-binding in hemicastrated immature female rats (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1397-1398 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hemigonadectomy in 9-day-old female rats results in a drastic increase in the weight and the number of HCG-binding sites of the remaining ovary during further development. However, on a per mg basis of ovarian weight, the number of HCG-receptors is identical in hemicastrated and control rats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920204
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  • 8
    Electronic Resource
    Electronic Resource
    Reappearance of HCG-receptors in immature rat ovary after HCG-treatment is not due to receptor synthesis (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 271-273 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In 24-day-old rats the reappearance of ovarian HCG-receptors after the injection of 200 IU HCG is independent of protein synthesis. The reutilization of occupied receptors in immature female rats is due to dissociation of the receptor-hormone complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920659
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  • 9
    Electronic Resource
    Electronic Resource
    Activation of mouse ribosomal RNA genes at the 2-cell stage (1977)
    Springer
    Human genetics 〈Berlin〉 38 (1977), S. 57-63 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The Ag-AS method, developed by Goodpasture and Bloom (1975) stains transcriptionally active nucleolus organizer regions (NORs) on the chromosomes and in the interphase nuclei. Metaphases and interphase nuclei of early mouse embryos (unfertilized eggs, pronucleus stages, 2-, 4-, 8-cell stages, and morulae) were subjected to silver-staining. First staining of a single chromosome bearing an NOR was observed at the 2-cell stage. At the 4-cell stage 4–6 chromosomes, and at the 8-cell stage invariably all the 6 chromosomes known to bear NORs, respond positively to silver-staining. These results indicate that during mouse embryogenesis ribosomal RNA genes start to function at the 2-cell stage. The polar body does not respond to silver-staining, which supports the view that the polar body genome remains inactive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295808
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence for postmeiotic expression of ribosomal RNA genes during male gametogenesis (1977)
    Springer
    Human genetics 〈Berlin〉 38 (1977), S. 279-284 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pre- and postmeiotic stages of male gametogenesis of 10 different vertebrate species belonging to mammals, birds, amphibians, and fishes were subjected to the Ag-AS staining technique (Goodpasture and Bloom, 1975). A uniform pattern of silver-staining is observable during spermatogenesis of the different vertebrate species. Silver-staining is present in spermatogonia and during the whole period of meiotic prophase, but totally absent during diakinesis and metaphase II of meiosis. In early spermatids silver-staining reappears and only disappears around the beginning of elongation of the spermatid nucleus. Since the Ag-AS technique is believed to stain only transcriptionally active nucleolus organizer regions, our findings indicate that ribosomal RNA genes become reactivated in the haploid spermatid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402153
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