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| 2. |
- Astrath, N. G. C., et al.
(författare)
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Thermal lens and photoacoustic spectroscopy to determine the thermo-optical properties of semiconductors
- 2005
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Ingår i: Journal de Physique IV. - : EDP Sciences. - 1155-4339 .- 1764-7177. ; 125, s. 181-183
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Tidskriftsartikel (refereegranskat)abstract
- In this work we used photoacoustic and thermal lens spectroscopy to study four different semiconductor samples: PbI2, 4HSiC, NiCrO and NiO. The results showed that the combination of these two techniques provided the values of the band gap energies and the thermal diffusivities.
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| 3. |
- Astrath, N. G. C., et al.
(författare)
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Band gap energy determination by photoacoustic spectroscopy under continuous light excitation
- 2006
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 89:23
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Tidskriftsartikel (refereegranskat)abstract
- In this work the authors used the photoacoustic spectroscopy under continuous light excitation to determine the optical band gap of semiconductors. The experiments were performed in lead iodide PbI2 and hexagonal silicon carbide 4H-SiC samples. The nonradiative relaxation processes are discussed in terms of the generated signal. A mechanism to describe the signal increase/decrease under the continuous excitation is presented. The results showed that the method was useful to locate the band gap directly from the optical absorption spectra.
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| 4. |
- Astrath, N. G. C., et al.
(författare)
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Photoacoustic spectroscopy to determine the optical properties of thin film 4H-SiC
- 2006
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Ingår i: Thin Solid Films. - : Elsevier BV. - 0040-6090 .- 1879-2731. ; 515:4, s. 2821-2823
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Tidskriftsartikel (refereegranskat)abstract
- The optical transitions in a range of 1.5-5.2 eV of n-type 4H-SiC have been investigated experimentally by photoacoustic spectroscopy and theoretically by a full-potential linearized augmented plane wave method. From the absorption spectrum, we found the indirect optical bandgap at 3.2 eV and the direct transitions around 4.5 eV in very good agreement with what has been predicted by theoretical calculations.
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| 5. |
- Boguszewski, M. C., et al.
(författare)
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Insulin-like growth factor-1, leptin, body composition, and clinical status interactions in children with cystic fibrosis
- 2007
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Ingår i: Horm Res. - : S. Karger AG. - 0301-0163. ; 67:5, s. 250-6
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND/AIMS: Children with cystic fibrosis (CF) are of increased risk of reduced fat body mass (FBM) and lean body mass (LBM). Serum concentrations of insulin-like growth factor-1 (IGF-1)and leptin could be markers of LBM and/or FBM depletion. To evaluate the relationships between disease activity, body composition, IGF-1 and leptin concentrations in CF children. METHODS: A cross-sectional study with 26 CF children aged 5.0-15.5 years and 33 healthy controls, mean age 9.4 years. Body composition was evaluated by dual-energy X-ray absorptiometry. Fasting blood samples were analyzed for leptin, IGF-1 and IGFBP-3. RESULTS: FBM standard deviation score (SDS; CF boys -0.02 +/- 0.88 vs. 0.78 +/- 0.65, p < 0.01; CF girls -0.37 +/- 1.15 vs. 0.70 +/- 0.97, p < 0.05), leptin concentration (CF boys 2.07 +/- 0.79 vs. 3.07 +/- 1.28 ng/ml, p < 0.05; CF girls 2.71 +/- 0.86 vs. 5.00 +/- 2.95 ng/ml, p < 0.05) and IGF-1SDS (CF boys -1.43 +/- 1.50 vs. -0.32 +/- 0.88, p < 0.05; CF girls -0.66 +/- 1.66 vs. 0.64 +/- 0.57, p < 0.01) were lower in CF children compared to controls. Shwachman score was the strongest predictor of lean body mass (R = 0.63). Leptin levels explain 60% of the variability in FBM. CONCLUSION: Serum concentrations of IGF-1 and leptin are decreased in children with CF and are associated with clinical conditions and body composition.
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| 8. |
- Lyashenko, AV, et al.
(författare)
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X-ray structural studies of the fungal laccase from Cerrena maxima
- 2006
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Ingår i: Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry. - : Springer Science and Business Media LLC. - 0949-8257. ; 11:8, s. 963-973
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Tidskriftsartikel (refereegranskat)
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