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  • 1
    Electronic Resource
    Electronic Resource
    On resonance processes in near-threshold excitation of the resonance lines of a Zn+ ion in electron-ion collisions (1998)
    Springer
    JETP letters 68 (1998), S. 646-650 
    Details
    ISSN: 1090-6487
    Keywords: 34.80.Kw ; 32.80.Dz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The excitation of the components of the 4p 2 P 1 2,3/2/0 resonance doublet of the Zn+ ion by monoenergetic electrons in the interval 4–10 eV is investigated by a spectroscopic method in crossed beams. Resonances are found in the energy dependences below and above the excitation thresholds of resonance lines. The subthreshold resonances are satellite of the lines investigated and are excited in the process of dielectronic recombination. The main competing process here is the electronic decay of autoionizing states, which is manifested in a resonance excitation of the ions starting at the thresholds for the excitation of the levels. Autoionizing states lying between the levels of the doublet splitting of the 4p 2 P 1 2,3/2/0 state decay to the 4p 2 P 1 2/0 level in a Koster-Kronig process. Above the excitation energy of the 4p 2 P 3 2/0 level the the dominant contribution to resonance excitation is from autoionizing states with configurations 3d 9(2 D 5/2,3/2)4s 2 np,(n−1)f.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567922
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion kinetics at fractal electrodes
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 366 (1994), S. 69-73 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(93)03053-R
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  • 3
    Electronic Resource
    Electronic Resource
    Antiauxin enhanced microshoot initiation and plant regeneration from epicotyl‐originated thin‐layer explants of sugarbeet (Beta vulgaris L.) (1996)
    Springer
    Plant cell reports 15 (1996), S. 851-854 
    Details
    ISSN: 1432-203X
    Keywords: Abbreviations: AC – activated chaarcoal, asdp– apical segment derived plantlet, asTLE – apical segment derived thin‐layer explant, BA – 6‐benzyjadenine, bsdp– basal segment derived plantlet, bsTLE – basal segment derived thin‐layer explant, EEM 1‐4‐epicotyl elongation media, GA3– gibberellic acid, GM – germinating medium, IAA – indole‐3‐acetic acid, IBA – indole‐3‐butyric acid, KN – kinetin, MES – morpholino‐ethane‐sulfonic acid, MSI 1‐6‐microshoot initiating media, NAA‐α‐naphthalene acetic acid, PG0B– De Greef and Jacobs (1979) medium, RM 1‐3‐rooting media, SDM – shoot developing medium, SE – standard error, TIBA – 2,3,5‐triiodobenzoic acid, TLE – thin‐layer, ZEA – zeatin.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An in vitro method was developed for microshoot initiation from thin‐layer explants prepared from the elongated epicotyls of sugarbeet (Beta vulgaris L.). Intact epicotyls of 14‐day‐old seedlings were excised from the hypocotyls above the cotyledons and allowed to elongate on De Greef and Jacobs (1979) medium supplemented with 0.2 mg/l 6‐benzyladenine, 0.2 mg/l gibberellic acid and 0.1 mg/l indole‐3‐acetic acid in darkness. After a 21‐day‐incubation, the elongated epicotyls were halved to obtain apical and basal segments prior to removing the leaves and lateral buds. Subsequently, 5–8 mm long, 2–3 mm wide and 0.8–1.0 mm thick tangential sections were prepared longitudinally from the exterior parts of the halved epicotyls. These thin‐layer explants were incubated on microshoot initiating media containing various growth regulators. The combination of 1.0 mg/l 6%dash;benzyladenine and the antiauxin 2,3,5‐triiodobenzoic acid (1.0 mg/l) resulted in maximum microshoot development (6.3∓0.2 microshoots/thin‐layer explant). The final efficiency of our tissue culture system was significantly increased by the NaCl (100 mg/l) initiated in vitro rooting of microshoot originated plantles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050134
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  • 4
    Electronic Resource
    Electronic Resource
    Antiauxin enhanced microshoot initiation and plant regeneration from epicotyl-originated thin-layer explants of sugarbeet (Beta vulgaris L.) (1996)
    Springer
    Plant cell reports 15 (1996), S. 851-854 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An in vitro method was developed for microshoot initiation from thin-layer explants prepared from the elongated epicotyls of sugarbeet (Beta vulgaris L.). Intact epicotyls of 14-day-old seedlings were excised from the hypocotyls above the cotyledons and allowed to elongate on De Greef and Jacobs (1979) medium supplemented with 0.2 mg/l 6-benzyladenine, 0.2 mg/l gibberellic acid and 0.1 mg/l indole-3-acetic acid in darkness. After a 21-day-incubation, the elongated epicotyls were halved to obtain apical and basal segments prior to removing the leaves and lateral buds. Subsequently, 5–8 mm long, 2–3 mm wide and 0.8–1.0 mm thick tangential sections were prepared longitudinally from the exterior parts of the halved epicotyls. These thin-layer explants were incubated on microshoot initiating media containing various growth regulators. The combination of 1.0 mg/l 6-benzyladenine and the antiauxin 2,3,5-triiodobenzoic acid (1.0 mg/l) resulted in maximum microshoot development (6.3±0.2 microshoots/thin-layer explant). The final efficiency of our tissue culture system was significantly increased by the NaCl (100 mg/l) initiated in vitro rooting of microshoot originated plantlets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233155
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  • 5
    Electronic Resource
    Electronic Resource
    Auger electron spectroscopy of the kinetics of evaporation of palladium beaded films from sapphire substrate (1998)
    Springer
    Applied physics 67 (1998), S. 469-473 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35.Fx; 68.55.Jk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: ) surface of sapphire were investigated by Auger electron spectroscopy in the temperature range of 1053–1083 K. It was found that the decrease of the effective thickness during heat treatments under 10-8 mbar was caused by evaporation from the surface of the substrate. Using the model developed by Kaganovskii and Beke we have established that the process is controlled by surface diffusion. It was shown that the evaporation rate of palladium adatoms from an alumina surface is given by Io=1.45×1036exp{-(393±46 kJ/mol)/RT}ms, and, on the basis of an estimation of the surface diffusion length, the effective surface diffusion coefficient Ds was evaluated:
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050805
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  • 6
    Electronic Resource
    Electronic Resource
    Surface Ostwald ripening of Pd nanoparticles on the MgO (100) surface (2000)
    Springer
    Applied physics 71 (2000), S. 19-22 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 82.80.Pv; 61.46.+w; 66.30.-h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Morphological changes of Pd nanoparticles on the (100) surface of MgO single crystal were investigated by Auger electron spectroscopy in the temperature range of 873–983 K. The size and distribution of clusters were also examined by means of atomic force microscopy. It was shown that there was practically no decrease of the effective thickness of deposited Pd during heat treatments under 6×10-9 mbar. Assuming that the observed change in the Auger intensities is due to the surface Ostwald ripening the temperature dependence of the surface mass transport diffusion coefficients can be given as D′ s=(1.6+8.2 -1.34)×10-8exp((-(136±15) kJ mol-1)/(RT))m2 s-1 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050019
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  • 7
    Electronic Resource
    Electronic Resource
    Ideas in Theoretical Biology - Comment About the Fractality of the Lung (1999)
    Springer
    Acta biotheoretica 47 (1999), S. 79-81 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is generally believed, that when the surface/volume ratio is high, fractal structure is expected to exist. The branched fractal structure of the lung has been cited as a “classical” example of this statement. In this short paper I would like to demonstrate that an alternative “lung” structure (namely sponge-like fractal) is at least as good as, or even better than the branched one, concerning this ratio, therefore, the cause of the lung's fractality lies elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002030328206
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of plant growth substances on the growth of axillary buds in cultured stem segments of Phaseolus vulgaris L. (1989)
    Springer
    Plant growth regulation 8 (1989), S. 165-183 
    Details
    ISSN: 1573-5087
    Keywords: apical dominance ; indoleacetic acid ; indoleacetic acid conjugates ; organ culture ; Phaseolus vulgaris L. ; plant growth substances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The hormonal control of axillary bud growth was investigated in cultured stem segments of Phaseolus vulgaris L. When the stem explants were excised and implanted with their apical end in a solid nutrient medium, outgrowth of the axillary buds-located at the midline of the segment-was induced. However, if indoleacetic acid (IAA) or naphthaleneacetic acid (NAA) was included in the medium, bud growth was inhibited. The exposure of the apical end to IAA also caused bud abscission and prevented the appearance of new lateral buds. In contrast to apically inserted segments, those implanted in the control medium with their basal end showed much less bud growth. In these segments, the auxin added to the medium either had no effect or caused a slight stimulation of bud growth. The IAA transport inhibitor N-1-naphthylphthalamic acid (NPA) relieved bud growth inhibition by IAA. This suggests that the effect of IAA applied at the apical end requires the transport of IAA itself rather than a second factor. With the apical end of the segment inserted into the IAA-containing medium, simultaneous basal application of IAA relieved to some extent the inhibitory effect of the apical IAA treatment. These results, together with data presented in a related article [Lim R and Tamas I (1989) Plant Growth Regul 8: 151–164], show that the polarity of IAA transport is a critical factor in the control of axillary bud growth. Of the IAA conjugates tested for their effect on axillary bud growth, indoleacetyl alanine, indoleacetic acid ethyl ester, indoleacetyl-myo-inositol and indoleacetyl glucopyranose were strongly inhibitory when they were applied to the apical end of the stem explants. There was a modest reduction of growth by indoleacetyl glycine and indoleacetyl phenylalanine. Indoleacetyl aspartic acid and indoleglyoxylic acid had no effect. In addition to IAA and its conjugates, a number of other plant growth substances also affected axillary bud growth when applied to the apical end of stem segments. Myo-inositol caused some increase in the rate of growth, but it slightly enhanced the inhibitory effect of IAA when the two substances were added together. Gibberellic acid (GA3) caused some stimulation of bud growth when the explants were from younger, rather than older plants. The presence of abscisic acid (ABA) in the medium had no effect on axillary bud growth. Both kinetin and zeatin caused some inhibition of axillary buds from younger plants but had the opposite effect on buds from older ones. Kinetin also enhanced the inhibitory effect of IAA when the two were applied together. In conclusion, axillary buds of cultured stem segments showed great sensitivity to auxins and certain other substances. Their growth responded to polarity effects and the interaction among different substances. Therefore, the use of cultured stem segments seems to offer a convenient, sensitive and versatile test system for the study of axillary bud growth regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024774
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  • 9
    Electronic Resource
    Electronic Resource
    Excitation of resonance lines of a Zn+ ion by electron impact (2000)
    Springer
    Optics and spectroscopy 89 (2000), S. 179-184 
    Details
    ISSN: 1562-6911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excitation of individual components of the resonance 4p 2 P 1 2,3/2/0 doublet of a Zn+ ion by electron impact is studied for the first time by the spectroscopic method in crossed beams. A distinct structure (above the ionization potential of an ion as well) found in the energy dependences of the effective excitation cross section is associated mainly with the decay to the resonance levels (direct or cascade) of autoionization states of zinc atoms and ions formed through the excitation of electrons from the subvalence 3d 10 shell. The results obtained are compared with data of other experiments and theoretical calculations by the method of strong coupling of five and fifteen states, as well as with the semiempirical calculation using the Van Regemorter formula.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1307431
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  • 10
    Electronic Resource
    Electronic Resource
    The transport of radiolabeled indoleacetic acid and its conjugates in nodal stem segments of Phaseolus vulgaris L. (1989)
    Springer
    Plant growth regulation 8 (1989), S. 151-164 
    Details
    ISSN: 1573-5087
    Keywords: axillary bud ; indoleacetic acid ; indoleacetic acid conjugates ; Phaseolus vulgaris L. ; radiotracers ; transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The transport of radiolabeled indoleacetic acid (IAA), and some of its conjugates, was investigated in nodal stem segments of Phaseolus vulgaris L. Donor agar blocks containing either [2-acetyl-14C]-IAA; [2-acetyl-14C]-indole-3-acetyl-L-aspartate (IAAsp); [2-acetyl-14C]-indole-3-acetyl-L-glycine (IAGly); or [2-acetyl-14C]-indole-3-acetyl-L-alanine (IAAla) were placed on either the apical or basal cut surface of stem segments each bearing an axillary bud at the midline. In some experiments, a receiver block was placed on the end opposite to the donor. After transport was terminated, the segments were divided into five equal sections plus the bud, and the radioactivity of donors, receivers and each part of the stem segment was counted. For all four substances tested, the amount of 14C transported to the axillary bud from the base was the same or greater than that from the apical end. After basipetal transport, the distribution of 14C in the segment declined sharply from apex to base. The inverse was true for acropetal transport. Transport for the three IAA conjugates did not differ substantially from each other. The IAA transport inhibitor, N-1-naphthylphthalamic acid (NPA), inhibited basipetal 14C-IAA transport to the base of the stem segment but did not alter substantially the amount of 14C-IAA recovered from the bud. Transport of 14C-IAA from the apical end to all parts of the stem segment declined when the base of the section was treated with nonradioactive IAA. Taken together with data presented in the accompanying article [Tamas et al. (1989) Plant Growth Regul 8: 165–183], these results suggest that the transport of IAA plays a role in axillary bud growth regulation, but its effect does not depend on the accumulation of IAA in the axillary bud itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024773
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