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  • 1
    Electronic Resource
    Electronic Resource
    Photoabsorption and direct dissociation cross sections of C2H2 in the 1530–1930 A(ring) region: A temperature dependent study (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 272-280 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using synchrotron radiation as a continuum light source, the absolute photoabsorption and direct dissociation cross sections of C2 H2 in the 1530–1930 A(ring) region have been measured at 295 and 155 K. In comparison with cross sections obtained at room temperature, the cross sections at absorption peaks typically increase by 10%–40% while those at absorption valleys decrease by as much as 30% at 155 K. Further, the absorption band profiles become narrower as the gas temperature decreases. In the presently studied wavelength region, there are at least three electronic states, namely, the A˜ 1 Au , the B˜ 1 Bu , and a continuum. Using the present low temperature data we have constructed the repulsive potential energy curve of the direct dissociation state according to the Franck–Condon principle. The potential energy curve thus constructed can be more accurate than that constructed by using room temperature cross section data because only the absorption cross section from the ν'=0 level contributes. The present cross section data have also been used in the analysis of oscillator strength distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457513
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  • 2
    Electronic Resource
    Electronic Resource
    Study of higher excited Rydberg states in ethylene (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4093-4094 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoabsorption and photoionization spectra of ethylene have been shown to exhibit weak broad structures in the spectral region between the ionization threshold and 1060 A(ring). Some members of three Rydberg series that converge to the first excited electronic state A˜(2B3) of C2H+4 have been identified. They have been tentatively assigned as transitions from the ground state to the 4sσ-, 4pσ-, 3d-, and 4d-Rydberg states. The C2H4 molecule is suggested to be twisted in at least the 4sσ- and nd-Rydberg states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460639
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  • 3
    Electronic Resource
    Electronic Resource
    Seed-set and pollen–stigma compatibility in Leymus chinensis (2004)
    Oxford, UK : Blackwell Science Ltd
    Grass and forage science 59 (2004), S. 0 
    Details
    ISSN: 1365-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Chinese leymus [Leymus chinensis (Trin.) Tzvel.] is an important forage distributed in East Asia. The seed-set rates and the pollen–stigma compatibility in six populations were investigated in 2001. Proportionately seed-set ranged from 0·065 to 0·567 under open pollination and 0·0056 to 0·0426 under self-pollination. The former is significantly higher than the latter in each population. Microscopic observations showed that proportionately only 0·0551 to 0·1167 of self-pollinated pollen grains were compatible but most cross-pollinated pollen grains were compatible. The tubes of most incompatible pollen grains aborted upon entering into the stigmas. Among the six populations, there was a significant correlation between seed-set under open pollination and the compatible pollen rates under cross-pollination. These results suggest that Chinese leymus is a self-incompatible species, and the compatibility of pollen and stigma might be one of the factors influencing seed-set in natural conditions. This information will be useful for future breeding efforts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2494.2004.00419.x
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  • 4
    Electronic Resource
    Electronic Resource
    trans-Dichloro[(1RS,4RS,5SR,7RS,8SR,11SR,12RS,14SR)-5,7,12,14-tetramethyl-1,4,8,11-tetraazacyclotetradecane-κ4N]cobalt(III) Perchlorate (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 714-716 
    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/S0108270197019690
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  • 5
    Electronic Resource
    Electronic Resource
    Diperchlorato[(1RS,4RS,5SR,7RS,8SR,11SR,12RS,14SR)-(5,7,12,14-tetramethyl-1,4,8,11-tetraazacyclotetradecane)]copper(II) (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 806-807 
    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/S0108270195012704
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  • 6
    Electronic Resource
    Electronic Resource
    Two Isomers of 5,7,12,14-Tetramethyl-1,4,8,11-tetraazacyclotetradecane (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 1146-1148 
    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/S0108270194011352
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  • 7
    Electronic Resource
    Electronic Resource
    [(5SR,7RS,12RS,14RS)-5,7,12,14-Tetramethyl-1,4,8,11-tetraazacyclotetradecane]nickel(II) Diperchlorate (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 2018-2020 
    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/S0108270195004458
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  • 8
    Electronic Resource
    Electronic Resource
    The mechanism of protection from 5 (N-ethyl-N-isopropyl)amiloride differs from that of ischemic preconditioning in rabbit heart (1997)
    Springer
    Basic research in cardiology 92 (1997), S. 339-350 
    Details
    ISSN: 1435-1803
    Keywords: Ischemic preconditioning ; Na+/H+ exchange ; 5-(N-ethyl-N-isopropyl)amiloride (EIPA) ; protein kinase C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated the effects of 5-(N-ethyl-N-isopropyl)amiloride (EIPA) on infarction in isolated rabbit hearts and cardiomyocytes. Thirty min of regional ischemia caused 29.6±2.8% of the risk zone to infarct in untreated Krebs buffer-perfused hearts. Treatment with EIPA (1 μM) for 20 min starting either 15 min before ischemia or 15 min after the onset of ischemia significantly reduced infarction to 5.4±2.0% and 7.0±1.0%, respectively (p〈0.01 versus untreated hearts). In both cases salvage was very similar to that seen with ischemic preconditioning (PC) (7.1±1.5% infarction). Unlike the case with ischemic preconditioning, however, protection from EIPA was not blocked by 50μM polymyxin B, a PKC inhibitor, or 1μM glibenclamide, a KATP channel blocker. Forty-five min of regional ischemia caused 51.0±2.9% infarction in untreated hearts. Ischemic preconditioning reduced infarction to 23.4±3.1% (p〈0.001 versus untreated hearts). In these hearts with longer periods of ischemia pretreatment with EIPA reduced infarction similarly to 28.8±2.1% (p〈0.01 versus untreated hearts). However, when EIPA was combined with ischemic PC, no further reduction in infarction was seen (23.8±3.5% infarction). To further elucidate the mechanism of EIPA's cardioprotective effect, this agent was also examined in isolated rabbit cardiomyocytes. Preconditioning caused a delay of about 30 min in the progressive increase in osmotic fragility that occurs during simulated ischemia. In contrast, EIPA had no effect on the time course of ischemia-induced osmotic fragility. Furthermore, EIPA treatment did not alter the salutary effect of ischemic preconditioning when the two were combined in this model. We conclude that Na+/H+ exchange inhibition limits myocardial infarction in the isolated rabbit heart by a mechanism which is quite different from that of ischemic preconditioning. Despite the apparently divergent mechanisms, EIPA's cardioprotective effect could not be added to that of ischemic or metabolic preconditioning in these models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788946
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  • 9
    Electronic Resource
    Electronic Resource
    The mechanism of protection from 5 (N-ethyl-N-isopropyl)amiloride differs from that of ischemic preconditioning in rabbit heart (1997)
    Springer
    Basic research in cardiology 92 (1997), S. 339-350 
    Details
    ISSN: 1435-1803
    Keywords: Key words Ischemic preconditioning – Na+/H+ exchange – 5-(N-ethyl-N-isopropyl)amiloride (EIPA) – protein kinase C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated the effects of 5-(N-ethyl-N-isopropyl)amiloride (EIPA) on infarction in isolated rabbit hearts and cardiomyocytes. Thirty min of regional ischemia caused 29.6 ± 2.8 % of the risk zone to infarct in untreated Krebs buffer perfused hearts. Treatment with EIPA (1 μM) for 20 min starting either 15 min before ischemia or 15 min after the onset of ischemia significantly reduced infarction to 5.4 ± 2.0 % and 7.0 ± 1.0 %, respectively (p 〉 0.01 versus untreated hearts). In both cases salvage was very similar to that seen with ischemic preconditioning (PC) (7.1 ± 1.5 % infarction). Unlike the case with ischemic preconditioning, however, protection from EIPA was not blocked by 50 μM polymyxin B, a PKC inhibitor, or 1 μM glibenclamide, a KATP channel blocker. Forty-five min of regional ischmia caused 51.0 ± 2,9 % infarction in untreated hearts. Ischemic preconditioning reduced infarction to 23.4 ± 3.1 % (p 〉 0.001 versus untreated hearts). In these hearts with longer periods of ischemia pretreatment with EIPA reduced infarction similarly to 28.8 ± 2.1 % (p 〉 0.01 versus untreated hearts). However, when EIPA was combined with ischemic PC, no further reduction was seen (23.8 ± 3,5 % infarction) To further elucidate the mechanism of EIPA's cardioprotective effect, this agent was also examined in isolated rabbit cardiomyocytes. Preconditioning caused a delay of about 30 min in the progressive increase in osmotic fragility that occurs during simulated ischemia. In contrast, EIPA had no effect on the time course of ischemia induced osmotic fragility. Furthermore, EIPA treatment did not alter the salutary effect of ischemic preconditioning when the two were combined in this model. We conclude that Na+/H+ exchange inhibition limits myocardial infarction in the isolated rabbit heart by a mechanism which ist quite different from that of ischemic preconditioning. Despite the apparently divergent mechanisms, EIPA's cardioprotective effect could not be added to that of ischemic or metabolic preconditioning in these models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788946
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructural changes of the rabbit corneal epithelium and endothelium after Timoptic treatment (1987)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 225 (1987), S. 325-330 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of this study was to determine whether timolol maleate (Timoptic) is cytotoxic to the cornea. The drug was applied as topical drops for 1 month to control rabbit eyes and rabbit eyes from which the epithelium had been removed or to de-epithelialized full-thickness autografts. Clinically all corneas and grafts remained clear. Scanning and transmission electronmicroscopy however revealed is drug induced epithelial damage, defective epithelial wound healing, and endothelial changes. The endothelial changes were most prominent in the group of rabbits that underwent de-epithelialization before corneal grafting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02153398
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