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- Aubin, G., et al.
(författare)
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Highly dispersive photonic crystal-based guiding structures
- 2006
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Ingår i: CLEO/QELS 2006. - : Optical Society of America. - 1557528136 - 9781557528131 ; , s. 972-974
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Konferensbidrag (refereegranskat)abstract
- Propagating modes supported by Photonic-Crystal guiding structures can demonstrate very high group velocity dispersion close to a cut-off. We investigate here the wavelength dependence of the dispersion for different Photonic Crystal structures.
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| 5. |
- Talneau, A., et al.
(författare)
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Highly dispersive photonic crystal-based coupled-cavity structures
- 2006
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 88:20, s. 201106-1-201106-3
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Tidskriftsartikel (refereegranskat)abstract
- We measured the wavelength dependence of the group velocity dispersion (GVD) for different photonic-crystal coupled-cavity structures through a phase analysis of the transmitted modulated signal. GVD values as large as 10(6)-10(7) times the dispersion of a standard single mode fiber are obtained when operating close to the band edge of the miniband, in agreement with the calculated group index. The GVD is found to be smaller for the structure based on more open cavities.
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- Uddhammar, A, et al.
(författare)
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Antibodies against Chlamydia pneumoniae, cytomegalovirus, enteroviruses and respiratory syncytial virus in patients with polymyalgia rheumatica
- 1997
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Ingår i: Clinical and Experimental Rheumatology. - 0392-856X .- 1593-098X. ; 15:3, s. 299-302
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To investigate the association between the onset of polymyalgia rheumatica (PMR) and prior or persistent infection with Chlamydia pneumoniae or cytomegalovirus (CMV), (both known to infect the vessel wall) enteroviruses (EV) or respiratory syncytial virus (RSV). Methods: Serum samples were collected from 48 patients with newly-diagnosed PMR and from 22 controls of the same age. The presence of IgG, IgA and IgM antibodies to C. pneumoniae, IgG and IgM antibodies to CMV and EV, and complement fixing antibodies to RSV were analysed. Results: Clinical symptoms of infection preceding PMR symptoms were associated with the presence of synovitis at the first visit. There were no significant differences in the seroprevalence rates of antibodies to C. pneumoniae, CMV, EV or RSV between PMR patients and controls. IgM antibodies to EV were found in two patients and IgM antibodies to CMV in another two patients. Conclusion: Serological evidence of an association between newly-diagnosed PMR and prior or chronic infection with C. pneumoniae was not found. IgM antibodies to EV in two patients, consistent with ongoing or recent infection, suggest that EV could represent one of perhaps several microbes which are able to trigger PMR.
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| 7. |
- Uddhammar, A, et al.
(författare)
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Cytokines and adhesion molecules in patients with polymyalgia rheumatica
- 1998
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Ingår i: British Journal of Rheumatology. - : Oxford University Press (OUP). - 0263-7103 .- 1460-2172. ; 37:7, s. 766-769
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Tidskriftsartikel (refereegranskat)abstract
- Serum levels of interleukin-1 beta (IL-1 beta), IL-1 receptor antagonist (IL-1ra), tumour necrosis factor alpha (TNF-alpha), IL-6, soluble IL-6 receptor (sIL-6R), soluble intercellular adhesion molecule-1 (sICAM-1) and soluble E-selectin were measured in 15 patients with newly diagnosed polymyalgia rheumatica (PMR) before and after 3 months of corticosteroid therapy. Both IL-6 and IL-1ra were significantly increased in untreated PMR and remained elevated compared with controls during therapy, although significantly only for sIL-1ra. sICAM-1 was raised in 12/15 (87%) patients at diagnosis and remained high in 10/14 (71%) patients; soluble E-selectin levels were initially raised in 6/15 (40%) patients and decreased with therapy in those with the highest levels. IL-6, IL-1ra and sICAM-1 are sensitive indicators of continuing immunological activation in PMR; the advantages of these markers in assessing the response to therapy should be investigated in a longitudinal study.
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| 8. |
- Uddhammar, A, et al.
(författare)
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Peripheral-blood lymphocyte subsets in polymyalgia-rheumatica
- 1995
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Ingår i: Clinical Rheumatology. - 0770-3198 .- 1434-9949. ; 14, s. 62-67
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Tidskriftsartikel (refereegranskat)abstract
- Peripheral blood lymphocytes from 23 patients with polymyalgia rheumatica (PMR) were characterized using monoclonal antibodies and flow cytometry in a two-year prospective study. There were no significant differences in absolute numbers or relative percentages of lymphocytes or CD3+, CD4+, CD8+ T cells or the CD4+ T cell functional subsets, virgin (CD4+ CD45RA+) and memory (CD4+ CD29+) T cells, in patients before or during corticosteroid treatment compared to controls. Previous reports on decreased levels of CD8+ T cells as a characteristic of PMR/giant cell arteritis was not confirmed. The absolute number and relative percentage of lymphocytes with natural killer cell activity, CD16+ CD56+ cells, were significantly lower in patients with active untreated PMR as well as during corticosteriod treatment compared to controls, but at the two-year follow-up the difference was less marked.
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