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  • 1
    Electronic Resource
    Electronic Resource
    Resonant third-harmonic generation in all-trans β-carotene: The vibronic origins of the third-order nonlinear susceptibility in the visible region (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6400-6412 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dispersion of the modulus of the third-order nonlinear susceptibility, ||χ(3)zzzz(−3ω;ω,ω,ω)||, of an all-trans β-carotene doped polystyrene thin film has been measured by third-harmonic generation throughout the 1 1Bu absorption band of the β-carotene. The observed dispersion is interpreted in terms of a three-electronic state model including explicit regard to six Franck–Condon active normal modes in the resonant electronic state. Both the sum-over-states method and, equivalently, the time domain approach are used. A fit of the three-state model to the data shows that the large nonlinear susceptibility of β-carotene in this wavelength range can be explained by strong dipole coupling between the strong one-photon allowed 1 1Bu state and a nearby two-photon allowed n 1Ag state. The electric dipole transition moment between the 1 1Bu excited state and the n 1Ag excited state, located at 22 200 cm−1, was determined to be 31 D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461560
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  • 2
    Electronic Resource
    Electronic Resource
    A Comparison of Three Quantification Methods for Estimation of Respiratory Sinus Arrhythmia (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 27 (1990), S. 0 
    Details
    ISSN: 1469-8986
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: The empirical literature has shown that respiratory sinus arrhythmia is a sensitive noninvasive index of parasympathetic cardiac control. Nevertheless there has been no general agreement among investigators as to the most preferable quantification technique for assessing respiratory sinus arrhythmia, although there has been much speculation that specific estimation techniques are more or less reflective of vagal processes and could be more or less contaminated by other influences upon heart period variability unrelated to respiration. This study compared three quantification procedures for estimating respiratory sinus arrhythmia (RSA): (1) a spectral analytic technique, (2) a complex detrending approach removing periodic and aperiodic cardiac variations unrelated to respiration, and (3) a time-domain, peak-valley procedure employing inspiratory and expiratory periods as windows for determining range of cardiac-interval fluctuations associated with respiratory phase. Measures derived from these techniques were intra- and interindividually compared using three different samples of male subjects, including students, adult normotensives, and adult hypertensives. All interindividual correlations between measures yielded coefficients above .92 and the mean within-subject correlation across 42 individuals was .96, thus indicating a marked degree of comparability between measures. Additionally, given that much evidence indicates lawful within-individual relations between RSA amplitude and respiratory parameters, we employed respiratory period as an external criterion and compared intraindividual correlations between this variable and (2) and (3); results showed that (3) was significantly more highly associated with respiration than was (2), although the mean r's for the two measures did not diverge greatly (.91 vs. 84). Finally, inspection of the data and further regression analyses did not suggest that any of the RSA estimates were differentially contaminated by other components of cardiac variability. Our findings suggest that the three techniques are almost equivalent as indices of cardiac vagal tone and would appear to ease concerns about the inferiority of any of the procedures. Choice of a quantification procedure should therefore be tailored to the specific empirical needs of an investigation. The advantages and disadvantages of each method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1469-8986.1990.tb03198.x
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  • 3
    Electronic Resource
    Electronic Resource
    Fractal Branchings: The Basis of Myocardial Flow Heterogeneities? (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 591 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb15103.x
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of a-chloro-b-dichloromethylstannio-[dc,ef-bis(8-dimethylamino-1-naphthyl)]platinum(IV) (1992)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 745-747 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270191011812
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of {ad,be-bis[(8-dimethylamino-κN)naphthyl-κC1]}-f-ethyl-c-iodoplatinum(IV) (1992)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 1303-1305 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270192001616
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  • 6
    Electronic Resource
    Electronic Resource
    Acidosis slows the response of oxidative phosphorylation to metabolic demand in isolated rabbit heart (1993)
    Springer
    Pflügers Archiv 423 (1993), S. 324-329 
    Details
    ISSN: 1432-2013
    Keywords: Cardiac mitochondria ; High-energy phosphates ; Oxygen consumption ; Metabolic control ; Acidosis ; Ischaemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to investigate the effect of acidosis on the mean response time of mitochondrial oxygen consumption to steps in heart rate and in left ventricular balloon volume. The mean response time may be viewed as the average delay between a change in adenosine triphosphate (ATP) hydrolysis and oxygen consumption. The mean response time is calculated by subtracting the transport time, required for diffusion of oxygen and for convective transport through the coronary vessels, from the response time measured in the coronary venous effluent. Eight isolated rabbit hearts were perfused according to Langendorff using Tyrode solution at 28°C. Arterial perfusate pH was lowered from 7.30±0.03 (mean±SD) to 6.59±0.02 by increasing the CO2 tension. At pH 7.3 the mean response time was 12.6±1.6 s, independent of the time after isolation of the heart. During acidosis, applied 40–75 min after isolation of the heart, the mean response time was 21.4±0.7 s and increased to 32.6±4.3 s during acidosis, 85–120 min after isolation. Thus the retardation of the metabolic response by acidosis might depend on the condition of the heart. A decrease of mitochondrial ATP synthetic capacity during acidosis may contribute to the retardation of the metabolic response. Since determination of the mean response time at 37°C is not yet feasible, the experiments were done at 28°C. Extrapolation of our findings to 37°C appears premature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374412
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  • 7
    Electronic Resource
    Electronic Resource
    Solid-state displacement reactions in the Fe-Ni-S and Cu-Ni-S systems between 400 and 500°C (1984)
    Springer
    Oxidation of metals 22 (1984), S. 147-160 
    Details
    ISSN: 1573-4889
    Keywords: Fe-Ni-S system ; Cu-Ni-S system ; displacement reaction ; diffusion path ; ternary diffusion ; multiphase diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Solid-state displacement reactions of the type A+BS→B+AS have been studied in the systems Fe-Ni-S and Cu-Ni-S. In diffusion couples, mainly of the type Fe/Ni3S2 and Cu/Ni3S2, the layer sequence, morphology, and growth rate of the reaction products have been investigated. The layer sequence of the reaction products in the couples appears to be just the reverse of that found previously in displacement reactions in some couples of oxide systems like Ni/Cu2O and Co/Cu2O. We find the sequence A/B/AS/BS, whereas in the oxide systems the sequence A/AO/B/BO has been found. This means that the metal atoms exchange and sulfide ions practically stand still in the first case, whereas in the oxide system the transport of oxygen is essential. For a correct interpretation of the results it was necessary to determine the isothermal cross-section through the Fe-Ni-S system at 460 and 500°C. At 500°C the iron stabilized high-temperature modification β-Ni3S2 was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656902
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  • 8
    Electronic Resource
    Electronic Resource
    On the layer sequence and morphology in solid-state displacement reactions (1984)
    Springer
    Oxidation of metals 22 (1984), S. 161-180 
    Details
    ISSN: 1573-4889
    Keywords: displacement reactions ; ternary diffusion ; multiphase diffusion ; diffusion path ; Ni-Cu-O ; Co-Cu-O ; Fe-Ni-O ; Fe-Cu-O ; Cu-Ni-S ; Fe-Ni-S ; Cr-Ni-S
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In displacement reactions of the type pA+BqX→qB+ApX, two main forms of the layer sequence have been found in the reaction layer, namely, A/ApX/B/BqX and A/B/ApX/BqX. In this paper it is argued that the thermodynamics of the system, more specifically the dependence of the activity of element X on the mole ratio between the elements A and B, determines the initial layer sequence. Various morphological variants of the two basic types may develop because of the kinetics. The prediction of the layer sequence and morphology made on the basis of this theory has been verified on a number of oxidic and sulfidic systems. It is, however, pointed out that these predictions also can be applied to purely metallic ternary systems and to other types of reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656903
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  • 9
    Electronic Resource
    Electronic Resource
    Mapping strategy for resistance genes in tomato based on RFLPs between cultivars: Cf9 (resistance to Cladosporium fulvum) on chromosome 1 (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 106-112 
    Details
    ISSN: 1432-2242
    Keywords: Lycopersicon esculentum ; RFLP ; Resistance gene mapping ; Cladosporium fulvum ; Genetic variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The contribution of introgressed regions derived from wild species to the genetic variation within the species of Lycopersicon esculentum was investigated by comparing the RFLP patterns of 2 introgression-free, obsolete cultivars (‘Moneymaker’ and ‘Premier’) and a modern cultivar (‘Sonatine’) that carries at least 5 introgressed resistance genes. In this analysis 195 mapped nuclear markers were used in combination with 6 restriction enzymes. Among the 1170 probe-enzyme combinations tested, only 3 showed a polymorphism between the 2 introgression-free cultivars. On the other hand 24 probe-enzyme combinations were found to exhibit polymorphisms between ‘Moneymaker’ and ‘Sonatine’. These represented ten polymorphic loci distributed among 5 linkage groups on chromosomes 1, 3, 4, 6, and 9. On the assumption that most of the polymorphic loci corresponded to introgressed chromosome segments of wild species carrying resistance genes, linkages between these loci and the component resistance genes were examined by RFLP analysis of pairs of near-isogenic lines differing only for one particular resistance gene, and a variety of commercial cultivars having different resistance gene compositions. Two of the polymorphic linkage groups could thus be ascribed to resistance genes whose map positions were already known: Cf2 on chromosome 6 and Tm2a on chromosome 9, whereas another marker, TG301 on chromosome 1, could be assigned to the Cladosporium fulvum resistance gene Cf9 with a hitherto disputable map position. By linkage analysis of a segregating F2 population the genetic distance between the Cf9 gene and the marker TG301 was estimated at 5.5 ± 2.3 cM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223988
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  • 10
    Electronic Resource
    Electronic Resource
    Resistance to powdery mildew (Oidium lycopersicum) in Lycopersicon hirsutum is controlled by an incompletely-dominant gene Ol-1 on chromosome 6 (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 467-473 
    Details
    ISSN: 1432-2242
    Keywords: Lycopersicon hirsutum ; Resistance gene mapping ; Oidium lycopersicum ; Gene clustering Bulked segregant analysis ; Powdery mildew ; Tomato RAPD ; Ol-1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The inheritance of resistance to powdery mildew (Oidium lycopersicum) in Lycopersicon hirsutum was investigated by disease tests in segregating populations obtained by hybridising tomato (L. esculentum) cv Moneymaker with the wild relative L. hirsutum G1.1560. One incompletely dominant gene Ol-1 was found to largely control resistance to the disease. To map Ol-1, DNA pools from seven resistant and ten susceptible F2 plants were analyzed for random amplified polymorphic DNA (RAPD). With 32 primers tested, one RAPD, primed with the sequence 5′-GACGTGGTGA-3′, was observed between the susceptible and the resistant bulks, which cosegregated with resistance in the F2 population of L. esculentum × L. hirsutum G1.1560. This RAPD was mapped on chromosome 6 by using an F2 (L. esculentum × L. pennellii) already mapped for 49 RFLPs. RFLP analysis of the F2 from L. esculentum cv Moneymaker × L. hirsutum G1.1560 demonstrated that Ol-1 maps near the Aps-1 region on chromosome 6, in the vicinity of the resistance genes to Meloidogyne spp. (Mi) and to Cladosporium fulvum (Cf-2/Cf-5).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225382
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