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Träfflista för sökning "(hsv:(NATURVETENSKAP) hsv:(Kemi)) srt2:(1980-1994) srt2:(1985-1989)"

Sökning: (hsv:(NATURVETENSKAP) hsv:(Kemi)) srt2:(1980-1994) > (1985-1989)

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  • Panas, Itai, 1959, et al. (författare)
  • A THEORETICAL-STUDY OF THE PEROXO AND SUPEROXO FORMS OF MOLECULAR-OXYGEN ON METAL-SURFACES
  • 1989
  • Ingår i: Chemical Physics Letters. - 0009-2614. ; 153:5, s. 458-464
  • Tidskriftsartikel (refereegranskat)abstract
    • Simple cluster model calculations have been performed for the peroxo and superoxo forms of O2 on metal surfaces. The ionization spectra of superoxo-O2 on Ag(110) and Pt(111) and for peroxo-O2 on Ag(110) are predicted in good agreement with the most reliable experimental measurements. It is shown that the large qualitative difference between these spectra can be used to decide experimentally whether O2 is chemisorbed in the peroxo or superoxo form. The O---O bond distance is calculated to be 1.32 Å for superoxo-O2 and 1.43 Å for peroxo-O2 in good agreement with the most recent NEXAFS measurements on Pt(111) and Ag(110), respectively. A problem in a recent analysis of a UPS spectrum for obtaining the O---O bond distance is pointed out.
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  • Dyrssen, David, et al. (författare)
  • Complexation of aluminum with DNA.
  • 1987
  • Ingår i: Journal of inorganic biochemistry. - 0162-0134 .- 1873-3344. ; 29:1, s. 67-75
  • Tidskriftsartikel (refereegranskat)abstract
    • The extent of complexation of aluminum(III) with DNA (Calf thymus, Sigma type I) was estimated by means of two experimental techniques: potentiometric titration with a fluoride selective indicator electrode and dialysis followed by aluminum determination by graphite furnace AAS. Both types of experiments indicate that aluminum(III) is bound to DNA. The data are treated by assuming an ion exchange reaction with the phosphate diester groups. Using Rt to denote the concentration of these groups the values of log [AlMn-3R]/(Rt-3[AlMn-3R])[Al3+] decrease from approx. 7.6 to 5.6 when the concentration of sodium chloride is increased from 1 to 100 mM. In the pH range 4.5-5.5 the ion exchange constant increases approximately 0.5 log units. Dialysis gives lower values for the complex formation constant than potentiometry.
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  • Nygren, Martin, et al. (författare)
  • Identification of 2,3,7,8-substituted polychlorinated dioxins and dibenzofurans in environmental and human samples
  • 1986. - 1
  • Ingår i: Chlorinated dioxins and dibenzofurans in perspective. - Boca Raton : CRC Press. - 9781315891545 - 9781351070645 ; , s. 17-34
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) are two series of tricyclic, almost planar aromatic compounds that exhibit very similar physical, chemical, and biological properties. The human exposure to PCDDs and PCDFs by milk consumption is not negligible. Detection levels in ecological and human samples should be orders of magnitude below the usual detection levels obtained in pesticide analyses. One objective of the study is to identify background levels of PCDDs and PCDFs in these samples, especially those of human origin. The spectrum of toxic effects is species dependent but for humans they include chloracne and porphyria cutane tarda and for other animals edema, thymic atrophy, teratogenicity, liver lesions and a slow wasting syndrome followed by death. It is evident that it is of particular importance to identify the ultimate source or sources of the toxic 2,3,7,8-substituted PCDDs and PCDFs found as background constituents in the environmental and human samples, especially the samples of mother's milk, which are of toxicological interest.
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  • Petfordlong, Amanda K., et al. (författare)
  • On the growth of small crystals of Cd, Zn, Pt and Rh during electron microscope observations
  • 1987
  • Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248. ; 80:2, s. 218-224
  • Tidskriftsartikel (refereegranskat)abstract
    • The growth of small supported metal crystals under the influence of an electron beam has been studied in real-time using a 400 keV ultra-high-resolution electron microscope. Samples of Pt, Rh, Cd and Zn supported on amorphous C or Si films were prepared ex situ and crystal growth in situ was recorded directly using a TV imaging/video system attached to the microscope. The different types of observed crystal growth are reported: the fcc metals (Pt and Rh) grow by coalescence, or by the addition of atoms along the particle surface followed by structural rearrangements which result in approximately spherical particles. The hcp metals (Cd and Zn) grow in the form of long rafts along the surface of the substrate film.
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  • Resultat 1-10 av 315
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