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  • Polymer and Materials Science  (3)
  • 34  (2)
  • Genetic variability  (2)
Document type
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of added nitrogen on multiphoton absorption by ammonia (1983)
    Springer
    Applied physics 32 (1983), S. 75-78 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 34 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multiphoton absorption (MPA) of the CO2 laser 9 μmR(30) line (pulse width 60 ns, FWHM) by NH3 and NH3/N2 mixtures was studied as a function of gas composition, pressure and laser fluence (Φ). MPA occurs for Φ smaller than those that have been used for optically pumped NH3/N2 lasers; consequently a simple two-level absorption model will not adequately describe laser action in these systems. The photon energy deposited in NH3/N2 mixtures can be calculated from the MPA cross-section and the fluence dependence of the illumination geometry. An examination of the efficiency of conversion of this absorbed energy to the reported radiant energy of optically pumped NH3/N2 lasers shows an optimum value which depends on pressure, and gas composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688546
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  • 2
    Electronic Resource
    Electronic Resource
    Multiphoton absorption and luminescence of osmium tetroxide (1985)
    Springer
    Applied physics 38 (1985), S. 51-55 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 34
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Both the multiphoton absorption and the luminescence brightness of osmium tetroxide induced by absorption of temporally smooth CO2 10P(20) laser pulses of 10 and 40 ns FWHM have been measured for pressures in the range 6.7 to 200 Pa. A dependence of these phenomena on laser pulse length is observed. Comparison of the luminescence brightness to the average excitation shows that the distribution of the multiphoton excitation depends on the laser pulse intensity for the two pulse lengths studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691770
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic behavior of somatic hybrids in the genus Nicotiana: N. otophora + N. tabacum and N. sylvestris + N. tabacum (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 93-101 
    Details
    ISSN: 1432-2242
    Keywords: Nicotiana ; Somatic hybrids ; Protoplast fusion ; Genetic variability ; Variegation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Somatic hybrids have been produced between N. tabacum and two closely related species in the genus Nicotiana, N. otophora and N. sylvestris, to evaluate interclonal variation and genetic behavior of these hybrids. As with the previously reported N. nesophila+ N. tabacum somatic hybrids, we have detected variation for morphological and isoenzyme characters between somatic hybrid clones, despite stability of chromosome number. One clone of N. sylvestris+N. tabacum was marked by variation in leaf spot frequency. The inheritance of this unstable trait was monitored through two sexual generations. Transmission of the Su gene marker was monitored in self-fertilized and back-crossed progeny of the N. sylvestris+N. tabacum somatic hybrids. Segregation ratios were similar to those previously reported for amphiploid N. sylvestris x N. tabacum sexual hybrids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264873
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of Nicotiana tabacum and Nicotiana nesophila hybrids produced by ovule culture and protoplast fusion (1982)
    Springer
    Theoretical and applied genetics 62 (1982), S. 193-198 
    Details
    ISSN: 1432-2242
    Keywords: Nicotiana ; Somatic hybrids ; Protoplast fusion ; Ovule culture ; Genetic variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Somatic hybrids were produced between Nicotiana tabacum and N. nesophila, two species incapable of conventional sexual hybridization. Sexual hybrids, though, could be produced between these two species by using ovule culture only when N. nesophila was female. Clones of somatic hybrids were compared with sexual hybrids. Statistically significant variation was observed between clones, but not between sexual hybrids, for pollen viability, flower morphology, leaf morphology, and trichome density. As all clones of somatic hybrids have 96 chromosomes, the variability could not be explained by interclonal variation in chromosome number. Variation between somatic hybrids could be the result of cytoplasmic segregation or recombination, mitotic recombination or small chromosomal rearrangements prior to plant regeneration. Variation between clones could be exploited as these interspecies hybrids are now being used to incorporate disease resistance into cultivated tobacco.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276236
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  • 5
    Electronic Resource
    Electronic Resource
    Stress relaxation of natural rubber during irradiation (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 725-733 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The site of chain scission and crosslinking in vulcanized natural rubber irradiated with 4 MeV electrons has been determined by analysis of stress relaxation data. Sulfur and peroxide vulcanizates of different crosslink densities were prepared and the crosslink densities determined from stress-strain measurements. Stress relaxation was measured during irradiation using modified commercial relaxometers. The specimens were maintained in an atmosphere of nitrogen to minimize oxidative side effects. Scission is deduced to take place in the vicinity of crosslinks, since the rate of continuous stress relaxation is independent of crosslink density. Scission may be associated both with crosslinks initially present and with those subsequently introduced by irradiation. Crosslinking by radiation is largely a random process. However, there is a crosslinking reaction dependent to a slight extent on crosslink density as well as a small contribution from random scission reactions. G values for the random reactions are given.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160070410
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  • 6
    Electronic Resource
    Electronic Resource
    Reaction of polystyrene with n-butyllithium-N,N,N′,N′-tetramethylethylenediamine (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 247-250 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120123
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  • 7
    Electronic Resource
    Electronic Resource
    Carbon-13 nuclear magnetic resonance spectra of methyl substituted polystyrenes (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 199-202 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.130120404
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    Paper (German National Licenses)
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