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- Larsson, A. -K, et al.
(författare)
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Coupled In/Te and Ni/vacancy ordering and the modulated crystal structure of a B8 type, Ni3 +/- xIn1-yTe2+y solid solution phase
- 2007
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Ingår i: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 180:10, s. 2723-2733
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Tidskriftsartikel (refereegranskat)abstract
- The commensurate superstructures of a NiAs/Ni2In type parent structure, Ni3.32InTe2 and Ni3.12In0.86Te2.14 (q = gamma[0 0 1]*, gamma = 2/3) as well as one dimensionally incommensurate structure of Ni31nTe2 (gamma = 0.71) were refined from neutron powder diffraction data (R-wp = 4.77%, 4.53% and 4.91 % for the three structures, respectively, at 298 K). The commensurate structures were refined in the P6(3)/mmc space group (c = 3c(NiAs)). The stacking sequence at the hcp array is -In/Te/Te/- and the trigonal bipyrainidal site within the In layer, Ni(2), is partially occupied while it is empty in the Te layers. The octahedral position in between the In and Te layers, Ni(1a), is fully occupied while the octahedral position in between two adjacent Te layers, Ni(1b), is partially occupied. With decreasing In and Ni content, the modulation wave vector,, was found to increase continuously until gamma = 1. From this, crenel functions to describe the whole homogeneity range of the solid solution were constructed with the length of the atomic domains Delta(Te) = gamma (and hence Delta(In) = Delta(Ni) = 1-gamma) and Delta(Ni(1b)) = gamma/2 (and hence Delta(Ni(1a)) = 1-gamma/2) which were then used for the refinement of the incommensurate structure of Ni3InTe2. The corresponding effect in real space is that the single In layers separating double layers of Te, occur less frequent when y in increasing until at gamma = 1 the CdI2 type structure of Ni1+xTe2 is reached.
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| 2. |
- Norén, L., et al.
(författare)
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A neutron and X-ray powder diffraction study of B8(2) related superstructure phases in the Ni-In system
- 2006
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Ingår i: Journal of Alloys and Compounds. - : Elsevier BV. - 0925-8388 .- 1873-4669. ; 424:1-2, s. 247-254
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Tidskriftsartikel (refereegranskat)abstract
- The crystal structures of two low temperature B8(2) related superstructure phases in the nickel indium system, Ni13In9 and Ni7-delta In3, have been refined and described in relation to the underlying parent Ni2In structure-type. They are isostructural to In13Pt9 and Cu7In3, respectively and both accommodate the change in stoichiometry from Ni2In by forming "same atom" structural motifs, In-centred indium octahedral units in the case of Ni13In9 and trigonal bipyramidal nickel units in the case of Ni7-delta In3. A sample with the nominal composition Ni51n3, reported to form part of a solid solution in the binary phase diagram, is not stable at 400 degrees C and forms a two-phase mix of Ni7-delta In3 and Ni13In9.
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| 6. |
- Bodén, Ida, et al.
(författare)
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Development and optimization of a novel skin impedance instrument
- 2005
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Ingår i: Proceedings of the 13th Nordic-Baltic Conference of BioMedical Engineering and Medical Physics. - : Swedish Society for Medical Engineering and Medical Physics. ; , s. 162-163
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Konferensbidrag (refereegranskat)abstract
- A novel skin impedance instrument is presented. The reproducibility and stability of the measurements where evaluated with multivariate techniques and a tendency to separate different skin types with skin impedance measurements is seen.
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| 7. |
- Fängström, Britta, et al.
(författare)
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Temporal trends of polybrominated diphenyl ethers and hexabromocyclododecane in milk from Stockholm mothers, 1980-2004.
- 2008
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Ingår i: Molecular Nutrition & Food Research. - : Wiley. - 1613-4125 .- 1613-4133. ; 52, s. 187-193
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Tidskriftsartikel (refereegranskat)abstract
- Environmental and human exposures to brominated flame retardants (BFR) have been of emerging concern since some BFR are persistent and bioaccumulative compounds. Among those, polybrominated diphenyl ethers (PBDE) have frequently been reported in low to high ng/g concentrations in human blood around the world while hexabromocyclododecane (HBCDD) only occasionally has been reported and then in the low ppb concentrations in human blood. The present study concerns PBDE congener and HBCDD concentrations in human milk from Stockholm from 1980 to 2004. HBCDD concentrations has increased four to five times since 1980 until 2002 but seems to have stabilized at this concentration in the last years (2003/04). Similarly, BDE-153 has continued to increase at least to 2001, after which it has stabilized in the mother's milk. Other PBDE congeners with four to five bromine substituents peaked 5 years earlier (1995) and are all decreasing. DecaBDE (BDE-209) is not a suitable biomarker for time trend studies according to the present results, showing no changes over time. This is likely due to its short apparent half-life in humans and poor transfer from blood to milk.
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| 8. |
- Johansson, Ann-Sofie, 1967-, et al.
(författare)
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Germ line insertions of moloney murine leukemia virus in the TLL mouse causes site-specific differences in lymphoma/leukemia frequency and tumor immunophenotype
- 2006
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Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 26:4B, s. 2873-2878
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Tidskriftsartikel (refereegranskat)abstract
- Background: Moloney murine leukemia virus (Mo-MLV) has proven valuable for studies of the pathogenesis of malignant lymphoma. Inoculation of newborn mice induces T cell lymphoma with 100% incidence. The TLL (T cell lymphoma/leukemia)-strain was previously established and was shown to spontaneously develop T cell lymphoma at high frequency. Materials and Methods: Differential screening of cDNA libraries was performed to discover an involvement of Mo-MLV and genomic sequencing was used to identify the chromosomal position of Mo-MLV proviral integration sites. Immunophenotypes of the tumors were established by flow cytometry. Disease frequency curves were created according to the Kaplan-Meier method. Results: Two independent Mo-MLV germ line integrations were characterized on chromosomes 2 and 14, giving rise to two substrains of mice denoted TLL-2 and TLL-14. The chromosomal position of the integrated provirus affected the frequency of disease, as well as the immunophenotype of the tumors. Conclusion: The data suggest that factors influencing the transcriptional activity of the chromosomal regions, leading to differences in proviral expression, could underlie the observed difference in tumor frequency.
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| 10. |
- Lidin, Sven, et al.
(författare)
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Incommensurate Stistaite-Order Made to Order
- 2009
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Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 48:12, s. 5497-5503
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Tidskriftsartikel (refereegranskat)abstract
- The stistaite SbSn phase contg. 40-57 at.% Sb was investigated by using single crystal x-ray diffraction and EDX to yield a simple relation between the modulated structure and compn. Stistaite is incommensurately ordered over its entire stability region.
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