| 1. |
- Akselsson, Roland, et al.
(författare)
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Fysikaliska faktorer
- 1994
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Ingår i: Arbete Människa Teknik. - 9175224143 ; , s. 45-113
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 2. |
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| 3. |
- Andersson, Dan, 1966, et al.
(författare)
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Wave-breaking-free pulses in nonlinear-optical fibers
- 1993
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Ingår i: Journal of the Optical Society of America B: Optical Physics. - 1520-8540 .- 0740-3224. ; 10:7, s. 1185-1190
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Tidskriftsartikel (refereegranskat)abstract
- A qualitative as well as quantitative investigation is made of the conditions for avoiding wave breaking during pulse propagation in optical fibers. In particular, it is shown that pulses having a parabolic intensity variation are approximate wave-breaking-free solutions of the nonlinear Schrodinger equation in the high-intensity limit. A simple expression for the compression factor of a fiber-grating compressor based on parabolic pulses is also derived.
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| 4. |
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| 5. |
- Davidsson, Åke, 1956-, et al.
(författare)
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Allergen-induced changes of B-cell phenotypes in patients with allergic rhinitis
- 1994
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Ingår i: Rhinology. - Amsterdam, Netherlands : International Rhinologic Society. - 0300-0729 .- 1996-8604. ; 32:4, s. 184-190
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Tidskriftsartikel (refereegranskat)abstract
- We investigated sub-populations of B-lymphocytes in nasal mucosa and peripheral blood of 17 patients with seasonal allergic rhinitis (birch pollen) and 10 controls. The study included provocation with allergen during the non-pollen season, during which no participant used medication. Samples were also taken during the pollen season. Subsets of B-cells as expressed by different CD antigens were investigated by immunohistochemistry on frozen sections and by flow cytometry of peripheral blood. Nasal CD23+ B-cells decreased in allergic patients during provocation, indicating that mature virgin CD23+ B-cells switch into a memory B-cell phenotype with loss of CD23 expression. This indicates differentiation towards cells that can represent a local source for IgE synthesis. No decrease was observed during the pollen season when the patients used medication. Serum IgE was significantly higher in allergic patients on all occasions. The observed up-regulation of CD40 expression on peripheral blood B-cells in allergic patients during the pollen season clearly indicate B-cell activation. Furthermore, a relative increase of CD19+ B-cells was observed in peripheral blood during provocation. Upregulation (by IL-4) of CD40 on B-cells which then may be stimulated by gp39 (CD40 ligand) can constitute an early and important event in the IgE-mediated allergic reaction.
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| 6. |
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| 7. |
- Hammar, Mattias, 1961-, et al.
(författare)
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Scanning tunnelling microscopy studies of Pt80Fe 20(110)
- 1993
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Ingår i: Journal of Physics: Condensed Matter. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 5:18, s. 2837-2842
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Tidskriftsartikel (refereegranskat)abstract
- Results of scanning tunnelling microscopy (STM) show that two different kinds of surface structures coexist on the (110) surface of Pt 80Fe20. The predominant structure corresponds well to the missing row type (1*2) reconstruction previously observed on, for example Pt(110), whereas the minority domains show a faintly buckled structure with approximately (1*1) geometry. Based on the STM images, the authors propose that the two domains have different surface chemical compositions and correspond to two different metallurgical phases known for the PtFe system at this composition.
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| 8. |
- Hellquist, H. B., et al.
(författare)
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Activated T cells in the nasal mucosa of patients with grass-pollen allergy. A pilot study
- 1992
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Ingår i: Rhinology. - Amsterdam, Netherlands : International Rhinologic Society. - 0300-0729 .- 1996-8604. ; 30:1, s. 57-63
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Tidskriftsartikel (refereegranskat)abstract
- Six patients with grass-pollen allergy were provoked with water-soluble grass pollen until a pronounced allergic reaction occurred. This was performed outside the grass-pollen season, and the allergen was administered on the edge of the inferior turbinate. Biopsies were taken both before provocation and during the reaction, 15-30 minutes after provocation. The nasal population of immunohistochemically positive cells for HLA-DR, CD1, interleukin-2-receptor, IgE, CD4 and CD8 were studied. There was a marked increase of IL2-R-positive cells (activated T lymphocytes) in the nasal mucosa after provocation, whilst the other cell populations approximately remained unchanged (apart from a certain increase of IgE). The increase of activated T lymphocytes may imply that certain subsets of T cells play a role in the allergic response, and that the role of helper T cells very likely is much more complex than the regulation of mast cells and eosinophils. The concomitant presence of Langerhans' cells (CD1-positive) and activated T lymphocytes may indicate a possible association on site between an antigen-presenting cell and both effector as well as memory cells in allergic reactions.
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| 9. |
- Hellquist, H. B., et al.
(författare)
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Basaloid squamous cell carcinoma of the palate
- 1994
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Ingår i: Histopathology. - Oxon, United Kingdom : Blackwell Publishing. - 0309-0167 .- 1365-2559. ; 25:2, s. 178-180
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Tidskriftsartikel (refereegranskat)
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| 10. |
- Hellquist, H. B., et al.
(författare)
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Nasal memory T lymphocytes capable of producing IL-4 in the allergic reaction
- 1992
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Ingår i: Allergy. European Journal of Allergy and Clinical Immunology. - West Sussex, United Kingdom : Wiley-Blackwell. - 0105-4538 .- 1398-9995. ; 47:4 Pt 1, s. 334-336
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports the presence of memory T cells in the nasal mucosa of allergic patients. The demonstration of CD4+/CD29+ (CD4+/CD45RO+) T lymphocytes, which are capable of interleukin-4 production, can indicate a complementary cell-mediated regulatory mechanism for mast cell proliferation and IgE synthesis in human nasal allergy. No substantial IgE production can be obtained in the absence of IL-4. Therefore, the existence of IL-4 producing cells on site in the nasal mucosa of allergic subjects probably implies a complementary interaction between cytokines and different immunocompetent nasal cells in the regulation of B cells and IgE synthesis.
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