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- 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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- Granqvist, Claes-Göran, et al.
(författare)
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Advances in chromogenic materials and devices
- 2009
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Ingår i: Proceedings of 6th International Symposium on Transparent Oxide Thin Films for Electronics and Optics, April 15-17, 2009, Tokyo Fashin Town Building, Japan. ; , s. 27-36
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Konferensbidrag (refereegranskat)
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- Håkanson, Bengt S, et al.
(författare)
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Comparison of wireless 48-h (Bravo) versus traditional ambulatory 24-h esophageal pH monitoring
- 2009
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Ingår i: Scandinavian journal of gastroenterology. - Oslo, Norway : Taylor & Francis. - 1502-7708 .- 0036-5521. ; 44:3, s. 276-83
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Tidskriftsartikel (refereegranskat)abstract
- Objective: To compare wireless with catheter-based esophageal pH recordings.Material and methods: Forty-five patients with symptoms suggestive of gastroesophageal reflux disease and 47 healthy volunteers were investigated in a university-affiliated hospital; 48-h wireless esophageal pH recording was performed. During the first 24 h, simultaneous traditional pH recording by catheter was undertaken. Nine of the volunteers underwent repeated measurements with both techniques. Outcome measures were feasibility, agreement, concordance of diagnostic yield, reproducibility, and subjective symptoms.Results: Subjective parameters were less affected when using the wireless technique alone (p<0.05). On using the wireless technique, esophageal acid exposure was underestimated approximately by half compared with traditional recording (p<0.05). Although pH data obtained with the two techniques were correlated (r(2)=0.66, p<0.001), the range between limits of agreement was wide (-3.7 to 10.0 percentage units of total time pH <4). Coefficients of variation for repeated measurements were 60.1+/-26.3% for catheter recordings, and 66.0+/-47.3 for wireless recordings on day 1 (NS). Concordance of diagnostic yield was 81.5% with all subjects included.Conclusions: Forty-eight-hour wireless Bravo pH monitoring is feasible but consistently underestimates esophageal acid exposure compared to the conventional technique. Although there is a significant correlation between the two techniques for pH recordings, the wide range in limits of agreement and the large coefficient of variation with both techniques suggest that the two methods are not immediately interchangeable for use in clinical practice.
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- Nyström, Jenny, 1972, et al.
(författare)
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A human glomerular SAGE transcriptome database
- 2009
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Ingår i: BMC Nephrol. - 1471-2369 .- 1471-2369. ; 10
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: To facilitate in the identification of gene products important in regulating renal glomerular structure and function, we have produced an annotated transcriptome database for normal human glomeruli using the SAGE approach. DESCRIPTION: The database contains 22,907 unique SAGE tag sequences, with a total tag count of 48,905. For each SAGE tag, the ratio of its frequency in glomeruli relative to that in 115 non-glomerular tissues or cells, a measure of transcript enrichment in glomeruli, was calculated. A total of 133 SAGE tags representing well-characterized transcripts were enriched 10-fold or more in glomeruli compared to other tissues. Comparison of data from this study with a previous human glomerular Sau3A-anchored SAGE library reveals that 47 of the highly enriched transcripts are common to both libraries. Among these are the SAGE tags representing many podocyte-predominant transcripts like WT-1, podocin and synaptopodin. Enrichment of podocyte transcript tags SAGE library indicates that other SAGE tags observed at much higher frequencies in this glomerular compared to non-glomerular SAGE libraries are likely to be glomerulus-predominant. A higher level of mRNA expression for 19 transcripts represented by glomerulus-enriched SAGE tags was verified by RT-PCR comparing glomeruli to lung, liver and spleen. CONCLUSION: The database can be retrieved from, or interrogated online at http://cgap.nci.nih.gov/SAGE. The annotated database is also provided as an additional file with gene identification for 9,022, and matches to the human genome or transcript homologs in other species for 1,433 tags. It should be a useful tool for in silico mining of glomerular gene expression.
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- Reyes, L. F., et al.
(författare)
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Gas sensor response of pure and activated WO3 nanoparticle films made by advanced reactive gas deposition
- 2006
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Ingår i: Sensors and actuators. B, Chemical. - : Elsevier BV. - 0925-4005 .- 1873-3077. ; 117:1, s. 128-134
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Tidskriftsartikel (refereegranskat)abstract
- Pure and activated (doped) nanocrystalline WO3 films, produced by advanced reactive gas deposition, were investigated for gas sensing applications. Activation took place by co-evaporation of Al or Au with tungsten oxide as the particles were produced. Structural characterization of the films was performed by electron microscopy and X-ray diffractometry. Sensitivity, response time, and recovery time of the sensors were systematically investigated as a function of annealing and operating temperature, using H2S, CO, and NO, as test gases. The sensitivity was found to lie below and around the ppm level for H2S and NO2, respectively.
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