| 1. |
- Kauranen, P, et al.
(författare)
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Spatial-mapping of Flame Radical Emission Using A Spectroscopic Multicolor Imaging-system
- 1991
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Ingår i: Applied Physics B-photophysics and Laser Chemistry. - 0721-7269. ; 53:4, s. 260-264
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Tidskriftsartikel (refereegranskat)abstract
- An intensified multi-colour digital imaging system allowing simultaneous monitoring of light from an object in four wavelength bands was used for flame emission studies. The spatial distribution of the molecular emission from different flame radicals, such as OH, C2, CH, and CN was recorded, also in the presence of a heavy background due to Planck-radiating soot particles. Exposure times down to 8-mu-s could be reached allowing studies of turbulent flames. The imaging spectroscopic recordings were supported by simultaneous point monitoring of the full emission spectrum. A technique for imaging flow measurements using a spectroscopic gas correlation technique is proposed.
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| 2. |
- Kauranen, P, et al.
(författare)
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Tomographic imaging of fluid flows by the use of two-tone frequency-modulation spectroscopy
- 1994
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Ingår i: Optics Letters. - 0146-9592. ; 19:18, s. 1489-1491
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Tidskriftsartikel (refereegranskat)abstract
- Diode laser absorption measurements obtained with two-tone frequency-modulation spectroscopy (TTFMS) are combined with tomography to produce spatially resolved quantitative images of fluid flows. The high sensitivity, good accuracy, and high stability of TTFMS absorption measurements permit optical-absorption tomography to be performed with low noise on extremely weakly absorbing objects. The method is demonstrated on a small oxygen flow with a GaAlAs diode laser operating near 760 nm and with an absorption sensitivity of 1:106.
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| 3. |
- Laari, S. P. K., et al.
(författare)
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Executive Dysfunction Related to Binge Drinking in Ischemic Stroke
- 2020
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Ingår i: Cognitive and Behavioral Neurology. - : Ovid Technologies (Wolters Kluwer Health). - 1543-3633. ; 33:1, s. 23-32
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Tidskriftsartikel (refereegranskat)abstract
- Background: Recent evidence has shown that cognitive dysfunction is associated with a history of binge drinking in adolescents who do not have an alcohol use disorder. Most previous studies with adults, however, have failed to show a link between cognitive dysfunction and subdiagnostic binge drinking, nor have any studies investigated the additive cognitive effect of binge drinking to ischemic stroke. Objective: To examine whether a pattern of cognitive dysfunction, especially executive and memory dysfunction, in patients with a first-ever ischemic stroke is associated with a history of subdiagnostic binge drinking. Methods: We studied 206 first-ever ischemic stroke patients (18-65 years) and 50 healthy, demographically comparable adults-both groups with no alcohol use disorder. After exclusion by matching, 189 patients and 39 healthy participants were included in our study (228 participants). The binge-drinking group included 76 participants; the non-binge-drinking group included 152. A multivariate analysis of covariance was used to compare nine cognitive functions between the two groups, with age, education, and stroke severity used as covariates. Results: Binge drinking had a significant negative effect on executive functions (P<0.001). The non-binge-drinking group outperformed the binge-drinking group on the Stroop Test (P=0.001), Trail Making Test (P=0.002), and a phonemic fluency test (P=0.005). The BingexStroke Severity interaction (P=0.037) indicated that a history of binge drinking increased the negative effect of stroke on executive functions. Conclusions: Subdiagnostic binge drinking may exacerbate the adverse effects of ischemic stroke on executive dysfunction.
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| 4. |
- Turunen, Katri E A, et al.
(författare)
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Domain-Specific Cognitive Recovery after First-Ever Stroke: A 2-Year Follow-Up.
- 2018
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Ingår i: Journal of the International Neuropsychological Society : JINS. - 1469-7661. ; 24:2, s. 117-127
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this work was to study the change in different cognitive domains after stroke during a 2-year follow-up.We evaluated both neuropsychologically and neurologically a consecutive cohort of working-age patients with a first-ever stroke at baseline (within the first weeks), 6 months, and 2 years after stroke-onset. A total of 153 patients participated in all examinations and were compared to 50 healthy controls.Forty-nine percent of the patients were cognitively impaired at baseline, 41% at 6 months, and 39% at 2-year follow-up. We analyzed seven cognitive domains (impairment rates at baseline and 2-year follow-up): psychomotor speed (34%; 23%), executive functions (27%; 17%), visual memory (21%; 4%), visuospatial function (20%; 14%), verbal memory (18%; 12%), basic language processing (baseline 11%; 6 months 5%), and reasoning (2 years 14%). The patients who were cognitively impaired at baseline improved more within 6 months, than either the controls or cognitively intact patients in all cognitive domains (all p<.05). Later on, between 6 months and 2 years, the domain-specific change scores did not differ between patients who were cognitively intact and impaired at 6 months. Also, the cognitive status (intact or impaired) remained the same in 90% of patients between 6-month and 2-year follow-ups. At 2 years, half of the patients, who were categorized cognitively impaired, were rated as well-recovered according to neurological evaluation.Most of the cognitive improvement took place within 6 months. Long-lasting cognitive impairment was common even after good neurological recovery. An early neuropsychological examination is essential in evaluating cognitive dysfunction and need for rehabilitation. (JINS, 2018, 24, 117-127).
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| 5. |
- Turunen, K. E. A., et al.
(författare)
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Executive Impairment Is Associated with Impaired Memory Performance in Working-Aged Stroke Patients
- 2016
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Ingår i: Journal of the International Neuropsychological Society. - : Cambridge University Press (CUP). - 1355-6177 .- 1469-7661. ; 22:5, s. 551-560
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: Executive dysfunction is associated with impaired memory performance, but controversies remain about which aspects of memory are involved and how general intelligence influences these connections. We aimed to clarify these connections in stroke patients by comparing various memory measures in patients with and without executive impairment. Methods: Our consecutive cohort included patients with a first-ever ischemic stroke. Neuropsychological assessments were completed 6 months and 2 years after stroke. We classified patients as executively impaired, when at least two of five executive measures were defective at 6 months. At both 6 months and 2 years, we compared list learning of unrelated words, story recall, and recall of geometric figures in patients with and without executive impairment, while controlling for general intelligence. Results: Patients with executive impairment (n = 66; 37%) performed worse in list learning (p = .001; partial eta(2) = .058) and immediate recall of a logical passage (p = .010; partial eta(2) = .037) 6 months after stroke compared to executively intact patients (n = 113). At the end of the 2-year follow-up period, the patients who were executively impaired at 6 months (n = 53; 37%) still performed worse than executively intact patients (n = 92) in list learning (p < .001; partial eta(2) = .096), and additionally in delayed recall of the list (p = .006; partial eta(2) = .052) and immediate recall of geometric figures (p = .007; partial eta(2) = .050). Conclusions: In our working-aged stroke patients, executive impairment was common. Executive impairment was associated with memory tasks that provided less inherent structure and required the use of active memory strategies. Clinicians should remember this role of executive dysfunction when interpreting memory performance.
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| 6. |
- Tyukmaeva, V. I., et al.
(författare)
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Localization of quantitative trait loci for diapause and other photoperiodically regulated life history traits important in adaptation to seasonally varying environments
- 2015
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Ingår i: Molecular Ecology. - : Wiley. - 0962-1083. ; 24:11, s. 2809-2819
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Tidskriftsartikel (refereegranskat)abstract
- Seasonally changing environments at high latitudes present great challenges for the reproduction and survival of insects, and photoperiodic cues play an important role in helping them to synchronize their life cycle with prevalent and forthcoming conditions. We have mapped quantitative trait loci (QTL) responsible for the photoperiodic regulation of four life history traits, female reproductive diapause, cold tolerance, egg-to-eclosion development time and juvenile body weight in Drosophila montana strains from different latitudes in Canada and Finland. The F2 progeny of the cross was reared under a single photoperiod (LD cycle 16:8), which the flies from the Canadian population interpret as early summer and the flies from the Finnish population as late summer. The analysis revealed a unique QTL for diapause induction on the X chromosome and several QTL for this and the other measured traits on the 4th chromosome. Flies' cold tolerance, egg-to-eclosion development time and juvenile body weight had several QTL also on the 2nd, 3rd and 5th chromosome, some of the peaks overlapping with each other. These results suggest that while the downstream output of females' photoperiodic diapause response is partly under a different genetic control from that of the other traits in the given day length, all traits also share some QTL, possibly involving genes with pleiotropic effects and/or multiple tightly linked genes. Nonoverlapping QTL detected for some of the traits also suggest that the traits are potentially capable of independent evolution, even though this may be restricted by epistatic interactions and/or correlations and trade-offs between the traits.
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| 7. |
- Yli-Rantala, E., et al.
(författare)
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Graphitised Carbon Nanofibres as Catalyst Support for PEMFC
- 2011
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Ingår i: Fuel Cells. - : Wiley-Blackwell. - 1615-6846 .- 1615-6854. ; 11:6, s. 715-725
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Tidskriftsartikel (refereegranskat)abstract
- Graphitised carbon nanofibres (G-CNFs) show superior thermal stability and corrosion resistance in PEM fuel cell environment over traditional carbon black (CB) and carbon nanotube catalyst supports. However, G-CNFs have an inert surface with only very limited amount of surface defects for the anchorage of Pt catalyst nanoparticles. Modification of the fibre surface is therefore needed. In this study Pt nanoparticles have been deposited onto as-received and surface-modified G-CNFs. The surface modifications of the fibres comprise acid treatment and nitrogen doping by pyrolysis of a polyaniline (PANI) precursor. The modified surfaces were studied by FTIR and XPS and the electrochemical characterization, including long-term Pt stability tests, was performed using a low-temperature PEMFC single cell. The performance and stability of the G-CNF supported catalysts were compared with a CB supported catalyst and the effects of the different surface treatments were discussed. On the basis of these results, new membrane electrode assemblies (MEAs) were manufactured and tested also for carbon corrosion by in situ FTIR analysis of the cathode exhaust gases. It was observed that the G-CNFs showed 5?times lower carbon corrosion compared to CB based catalyst when potential reached 1.5?V versus RHE in simulated start/stop cycling.
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