| 1. |
- Malmstrom, E, et al.
(författare)
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Dendritic polymers for photonic applications.
- 2002
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Ingår i: Abstracts of Papers of the American Chemical Society. - 0065-7727. ; 224, s. 384-POLY-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Ehinger, Magnus, et al.
(författare)
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Influence of CD4 or CD8 deficiency on collagen-induced arthritis
- 2001
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Ingår i: Immunology. - : Wiley. - 0019-2805 .- 1365-2567. ; 103:3, s. 291-300
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Tidskriftsartikel (refereegranskat)abstract
- The role of T cells in the mouse collagen-induced arthritis (CIA) model for rheumatoid arthritis is not clarified, and different results have been reported concerning the role of CD4 and CD8 T cells. To address this issue, we have investigated B10.Q mice deficient for CD4 or CD8. The mice lacking CD4 were found to be less susceptible to disease, but not completely resistant, whereas the CD8 deficiency had no significant impact on the disease. No difference in the development of late occurring relapses was noted. Interestingly, the CD4-deficient mice had a severely reduced response to the glycosylated form of the immunodominant type II collagen (CII) 256–270 peptide whereas the response to the non-glycosylated peptide was not significantly different. Furthermore, CD4-deficient mice had lower antibody responses to CII, explaining the lower disease susceptibility. In comparison with previously reported results, it is apparent that the lack of CD4 molecules has a different impact on CIA if present on different genetic backgrounds, findings that could possibly be related to the occurrence of different disease pathways of CIA in different mouse strains.
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| 3. |
- Pitois, Claire, et al.
(författare)
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Fluorinated dendritic polymers and dendrimers for waveguide applications
- 2003
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Ingår i: Optical materials (Amsterdam). - 0925-3467 .- 1873-1252. ; 21:1-3, s. 499-506
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Tidskriftsartikel (refereegranskat)abstract
- I Fluorinated hyperbranched polymers and dendrimers with low optical losses and functionality to modify refractive index and add a cross-linking unit were developed. The results of refractive index. measurements indicate a tunability of the refractive index between approximately 1.5 and 1.6, and optical losses below 0.5 dB/cm at 1550 nm. Dendrimers with similar, surface group structure and possibility to surface functionalization were prepared using a lanthanide. cation as focal point. Results on luminescent properties in the NIR and IR regions were measured for lanthanide ions such as Nd3+ and Er3+, showing characteristic emission bands at 1.06, 1.3 and 1.5 mum. The associated absorption and excitation spectra were found similar to those of the corresponding ions in optical glasses.
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| 4. |
- Rodlert, Marlene, et al.
(författare)
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Chiral dendritic polymers for photonic applications
- 2002
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Ingår i: Synthetic metals. - 0379-6779 .- 1879-3290. ; 127:03-jan, s. 37-43
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Tidskriftsartikel (refereegranskat)abstract
- We present chiral dendrons of different generations accomplished by reacting the hydroxyl groups at the chain ends with (-)menthoxyacetic acid. Subsequent deprotection of the carboxylic acid rendered acid functional chiral dendrons. The acid-functionalized chiral dendrons were doped with divalent cations CU2+, Fe2+ and Zn2+, and trivalent lanthanide cations Nd3+ and Pr3+. We present results on their optical rotatory power along with circular dichroism spectroscopy and results of paramagnetic resonance. The chiral dendrons were shown to influence the electronic transitions of the metal ions (CD spectra). Attempts to characterize the circularly polarized luminescence of the Nd-dendrimer failed due to low quantum yield. The luminescence efficiency was found to be at least one order of magnitude lower than that of a fluorinated and non-chiral dendrimer structure of similar size and coordination structure.
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| 5. |
- Vestberg, Robert, et al.
(författare)
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Dendritic polyesters for optical applications
- 2003
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Ingår i: ORGANIC NANOPHOTONICS. - DORDRECHT, NETHERLANDS : SPRINGER. - 1402012799 ; , s. 169-176
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Konferensbidrag (refereegranskat)abstract
- In the protection against lasers, optical power limiting (OPL) is an area of interest. We have explored the effect of using dendritic molecules, based on bis-MPA (2,2-bis(methylol)-propionic acid), as encapsulants; of porphyrine and thiophene dyes having OPL-properties. Preliminary results indicate that the OPL-effect of the porphyrine is increased approximately by a factor 2 if the porphyrine is. decorated with dendritic wedges. This is thought to be a result of isolation of the dye leading to extended lifetimes for the excited states, increasing the probability for multi-photon absorption. For the thiophenes no OPL-effect was observed. This was probably due to the small size of the dendrons; (first generation).
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| 6. |
- Vestberg, Robert, et al.
(författare)
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Novel dendrimer-capped Pt-acetylides for optical power limiting
- 2004
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Ingår i: OPTICAL MATERIALS IN DEFENCE SYSTEMS TECHNOLOGY. - : SPIE-INT SOC OPTICAL ENGINEERING. - 0819455741 ; , s. 31-45
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Konferensbidrag (refereegranskat)abstract
- This report presents preliminary optical limiting and spectroscopic characterization of dendrimer capped Pt-ethynyls. Preliminary OPL and spectroscopic characterization revealed that these have better OPL properties than the non-capped analogue. The excited state properties in terms of luminescence for emission at ca 400 nm and 525 nm is in the ns and mus range, respectively. The site isolation provided by the dendrimer capping also give rise to strong phosphorescence involving the same emission bands near 525 nm. The decay time for this was found to be in the range 0.2 ms, considerably longer than for other similar Pt-complexes, and we tentatively assign this to a site-isolation effect that prevents quenching of the triplete state. It was shown how the dendron capping also makes it feasible to blend the dye with e.g. MMA monomers and carry out polymerization to obtain a solid OPL device with good performance.
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