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- Cosquer, Guirec Y., Wang J., Naeslund C., Adams D.M., Ji W., Zhuo J-C., Anisuzzaman A.K.M.,Sjöberg S., Barth R.F., Eriksson S., Tjarks W.
(author)
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Synthesis and biological evaluation of carboranyl thymidines for BNTC
- 2001
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In: 221st MEDI-151. - : Abstr Pap Am Chem Soc. ; , s. 151-
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Journal article (other academic/artistic)abstract
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| 4. |
- Hjelte, I, et al.
(author)
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Evidence for ultra-fast dissociation of molecular water from resonant Auger spectroscopy
- 2001
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In: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 334:1-3, s. 151-158
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Journal article (peer-reviewed)abstract
- We present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the Ols --> 4a(1) resonance. The core-excited H2O molecules are shown to dissociate into core-excited O*H and neutral H on a time scale comparable
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| 5. |
- Hjelte, I., et al.
(author)
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Evidence for ultra-fast dissociation of molecular water from resonant Auger spectroscopy
- 2001
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In: Chemical Physics Letters. - 0009-2614. ; 334:1-3, s. 151-158
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Journal article (peer-reviewed)abstract
- We present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the O1s→4a1 resonance. The core-excited H2O molecules are shown to dissociate into core-excited O*H and neutral H on a time scale comparable to the core hole lifetime, i.e. a few femtoseconds. This conclusion is based on a resonant Auger study, qualitative arguments and ab initio calculations. 'Hot bands' connected to Auger transitions from vibrationally excited OH fragments are identified, and these exhibit a dynamical behavior which qualitatively follows the change in excess energy.
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| 6. |
- Kjellson, Fred, et al.
(author)
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Tensile properties of a bone cement containing non-ionic contrast media
- 2001
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In: Journal of Materials Science: Materials in Medicine. - 1573-4838. ; 12:10-12, s. 889-894
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Journal article (peer-reviewed)abstract
- The addition of contrast media such as BaSO4 or ZrO2 to bone cement has adverse effects in joint replacements, including third body wear and particle-induced bone resorption. Ground PMMA containing particles of the non-ionic water-soluble iodine-based X-ray contrast media, iohexol (IHX) and iodixanol (IDX), has, in bone tissue culture, shown less bone resorption than commercial cements. These water-soluble non-ceramic contrast media may change the mechanical properties of acrylic bone cement. The static mechanical properties of bone cement containing either IHX or IDX have been investigated. There was no significant difference in ultimate stress between Palacos R (with 15.0 wt % of ZrO2) and plain cement with 8.0 wt % of IHX or IDX with mass median diameter (MMD) of 15.0 or 16.0 microm, while strain to failure was higher for the latter (p < 0.02). The larger particles (15.0 or 16.0 microm) gave significantly higher (p < 0.001) ultimate tensile strengths and strains to failure than smaller sizes (2.4 or 3.6 microm). Decreasing the amount of IHX from 10.0 wt % to 6.0 wt % gave a higher ultimate tensile strength (p < 0.001) and strain to failure (p < 0.02). Scanning electron microscopy (SEM) showed the smaller contrast media particles attached to the surface of the polymer beads, which may prevent areas of the acrylate bead surface from participating in the polymerization. In conclusion, the mechanical properties of bone cement were influenced by the size and amount of contrast medium particles. By choosing the appropriate amount and size of particles of water-soluble non-ionic contrast media the mechanical properties of the new radio-opaque bone cement can be optimized, thus reaching and surpassing given regulatory standards.
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