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  • 1
    Electronic Resource
    Electronic Resource
    The cell cycle in vegetative and floral shoot meristems measured by a double labelling technique (1975)
    Springer
    Planta 126 (1975), S. 37-43 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A double labelling technique was used to measure the length of the cell cycle in the shoot apical meristem of Silene coeli-rosa L. plants kept in short days, in which they remained vegetative, or exposed to 7 long days, which induced flowering. The length of the cell cycle in the vegetative plants (those in short days throughout) was about 18 hrs. It was also 18 hrs, or somewhat longer, in plants which had been exposed to long-day conditions for 5 days, by which time 90% of the plants are committed to flower. When plants had been exposed to the full inductive period of 7 long days and had been transferred back again to non-inductive (short day) conditions, floral morphogenesis had just begun and the cell cycle had almost halved, to 10 hrs. The cell cycle was therefore unaltered during floral induction and shortened only at the onset of the growth of the flower itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389358
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changes in RNA levels in the shoot apex of Silene during the transition to flowering (1977)
    Springer
    Planta 136 (1977), S. 167-172 
    Details
    ISSN: 1432-2048
    Keywords: Floral induction ; Gibberellic acid ; RNA ; Shoot meristem ; Silene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in RNA concentration in the shoot apical meristem during induction and the transition to flowering were measured histochemically in Silene coeli-rosa (L.) Godron, a long-day plant. In the apices of plants induced by 7 long days the RNA concentration increased to about 25 per cent higher than in non-induced plants. Three long days did not induce flowering but resulted in a transient rise in RNA concentration. When plants were given long days interrupted by varying numbers of short days successful induction was accompanied by a sustained increase in RNA concentration but those treatments which were not inductive gave only transient increases in RNA. Gibberellic acid had no effect on induction or apical growth rates but increased the RNA concentration by 50 per cent or more in both induced and non-induced plants. Plants induced to flower at 13° C had the same RNA concentration and growth rate at the apex as in non-induced plants at 20° C. Since changes in RNA concentration in the apex could occur without changes in growth rate and without flowering, and induction could occur without a change in RNA concentration or growth rate, it is suggested that the increase in RNA and growth rate which normally occur at the transition to flowering might not be essential for the formation of a flower but may be more closely related to the rapid growth associated with the formation of the inflorescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396194
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of isotopes of element 102 with mass numbers 254, 253, and 252 (1967)
    Springer
    Atomic energy 22 (1967), S. 93-100 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstracts In experiments on the irradiation of Pu242 and Pu239 with O16 and O18 ions in the extracted beam of the 310-era cyclotron of the Joint Institute for Nuclear Research, isotopes of 102254, 102253 and 102252 have been synthesized. Their properties are given below: Isotope T1/2, sec Eα, meV 102254 75±15 8.11±0.03 102253 95±10 8.01±0.03 102252 4.5±1.5 8.41±0.03 In order to identify the isotopes, the excitation functions are measured in crossover reaetions and the α decay of the daughter nuclei is recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246261
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of isotopes of fermium with mass numbers 247 and 246 (1967)
    Springer
    Atomic energy 22 (1967), S. 434-437 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract The isotopes Fm247, Fm247m and Fm246 were synthesized in the extracted beam of the 310-cm heavy-ion cyclotron in the Joint Institute for Nuclear Research by irradiating Pu239 with C12 ions. ]he procedure of collecting the recoil atoms by means of gas jets is used, with subsequent recording of their ~- decay with Si(Au) detectors. For the isotope Fm247, α-activities are obtained with two different half-lives - one with two obviously complex groups of α-particles Eα=7.87±0.05MeV (∼70%) and EEα=7.93±0.05 MeV (∼30%), whose half- life is T1/2=35±4 sec; the other, with Eα=8.18±0.03 MeV has T1/2=9.2±2.3 sec. Data are confirmed concerning the properties of the isotope Fm246(Eα=8.25±0.03MeV and T1/2=1.6±0.4 sec), synthesized in 1966 at The Joint Institute for Nuclear Research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01175203
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  • 5
    Electronic Resource
    Electronic Resource
    The properties of the isotope 102254 (1966)
    Springer
    Atomic energy 20 (1966), S. 264-266 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Abstract The isotope 102254 was synthesized in the extracted beam of the OIYaI (United Institute of Nuclear Research) 150-cm cyclotron by means of the reaction Am243(N15, 4n) 102254. By recording the alpha disintegrations of the primary and daughter nuclei, it was shown that the half-life of this isotope is between 20 and 50 sec, while the energy of its emitted alpha particles is 8.10±0.05 MeV. These figures disagree with the literature data (T1/2=3 sec, Ecα=8.3 MeV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01127386
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    Paper (German National Licenses)
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