8 research outputs found
Results from the intercalibration of optical low light calibration sources 2011
Following the 38th Annual European Meeting on Atmospheric Studies by Optical Methods in Siuntio in Finland, an intercalibration workshop for optical low light calibration sources was held in SodankylĂ€, Finland. The main purpose of this workshop was to provide a comparable scale for absolute measurements of aurora and airglow. All sources brought to the intercalibration workshop were compared to the Fritz Peak reference source using the Lindau Calibration Photometer built by Wilhelm Barke and Hans Lauche in 1984. The results were compared to several earlier intercalibration workshops. It was found that most sources were fairly stable over time, with errors in the range of 5â25%. To further validate the results, two sources were also intercalibrated at UNIS, Longyearbyen, Svalbard. Preliminary analysis indicates agreement with the intercalibration in SodankylĂ€ within about 15â25%.publishedVersio
Mitochondrial genome variation of Atlantic cod
Objective: The objective of this study was to analyse intraspecifc sequence variation of Atlantic cod mitochondrial
DNA, based on a comprehensive collection of completely sequenced mitochondrial genomes.
Results: We determined the complete mitochondrial DNA sequence of 124 cod specimens from the eastern and
western part of the speciesâ distribution range in the North Atlantic Ocean. All specimens harboured a unique mitochondrial
DNA haplotype. Nine hundred and ffty-two polymorphic sites were identifed, including 109 non-synonymous
sites within protein coding regions. Eighteen variable sites were identifed as indels, exclusively distributed in
structural RNA genes and non-coding regions. Phylogeographic analyses based on 156 available cod mitochondrial
genomes did not reveal a clear structure. There was a lack of mitochondrial genetic diferentiation between two
ecotypes of cod in the eastern North Atlantic, but eastern and western cod were diferentiated and mitochondrial
genome diversity was higher in the eastern than the western Atlantic, suggesting deviating population histories.
The geographic distribution of mitochondrial genome variation seems to be governed by demographic processes
and gene fow among ecotypes that are otherwise characterized by localized genomic divergence associated with
chromosomal inversions
Results from the intercalibration of optical low-light calibration sources 2011
Abstract. Following the 38th Annual Meeting on Atmospheric studies by Optical methods at Siuntio in Finland, an intercalibration workshop for optical low-light calibration sources was held in SodankylĂ€, Finland. The main purpose of this workshop was to provide a comparable scale for absolute measurements of aurora and airglow. All sources brought to the intercalibration workshop were compared to an international standard source (Fritz-Peak) using the Lindau Calibration Photometer built by Wilhelm Barke and Hans Lauche in 1984. The international standard source is on loan from Michael Gadsden, Aberdeen. The results were compared to several earlier intercalibration workshops. It was found that most sources were fairly stable over time with errors in the range of 5â20%. To further validate the results, two sources were also intercalibrated at UNIS, Longyearbyen, Svalbard. Preliminary analysis indicate good agreement with the intercalibration in SodankylĂ€
Results from the intercalibration of optical low-light calibration sources 2011
Following the 38th Annual European Meeting on Atmospheric Studies by Optical Methods in Siuntio in Finland, an intercalibration workshop for optical low light calibration sources was held in Sodankyla, Finland. The main š purpose of this workshop was to provide a comparable scale for absolute measurements of aurora and airglow. All sources brought to the intercalibration workshop were compared to the Fritz Peak reference source using the Lindau Calibration Photometer built by Wilhelm Barke and Hans Lauche in 1984. The results were compared to several earlier intercalibration workshops. It was found that most sources were fairly stable over time, with errors in the range of 5â25 %. To further validate the results, two sources were also intercalibrated at UNIS, Longyearbyen, Svalbard. Preliminary analysis indicates agreement with the intercalibration in Sodankyla within š about 15â25 %