Application of grounded theory in career research reviewed

Most research studies pose some element of concern, discrepancies and controversy. Grounded theory (GT) research is not an exception. This paper provides an overview of how GT was applied in a PhD study about career transition phenomenon. It should be noted that it is not the intent of this paper to provide a detailed account of the completed study, but rather to provide a practical example of the process followed, which first-time GT researchers might find useful. Therefore, firstly, this paper provides an overview of GT in general, including two of the most controversial topics which are the use of literature and the application of qualitative data analysis (QDA) programs. Secondly, the researcher’s school of thought and her first-hand account of how grounded theory was applied, is explained

Detection of Voigt Spectral Line Profiles of Hydrogen Radio Recombination Lines toward Sagittarius B2(N)

We report the detection of Voigt spectral line profiles of radio recombination lines (RRLs) toward Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT). At radio wavelengths, astronomical spectra are highly populated with RRLs, which serve as ideal probes of the physical conditions in molecular cloud complexes. An analysis of the Hn(alpha) lines presented herein shows that RRLs of higher principal quantum number (n>90) are generally divergent from their expected Gaussian profiles and, moreover, are well described by their respective Voigt profiles. This is in agreement with the theory that spectral lines experience pressure broadening as a result of electron collisions at lower radio frequencies. Given the inherent technical difficulties regarding the detection and profiling of true RRL wing spans and shapes, it is crucial that the observing instrumentation produce flat baselines as well as high sensitivity, high resolution data. The GBT has demonstrated its capabilities regarding all of these aspects, and we believe that future observations of RRL emission via the GBT will be crucial towards advancing our knowledge of the larger-scale extended structures of ionized gas in the interstellar medium (ISM)

Point-like topological defects in bilayer quantum Hall systems

Following a suggestion given in Phys. Lett. B 571 (2003) 250, we show how a bilayer Quantum Hall system at fillings nu =m/pm+2 can exhibit a point-like topological defect in its edge state structure. Indeed our CFT theory for such a system, the Twisted Model (TM), gives rise in a natural way to such a feature in the twisted sector. Our results are in agreement with recent experimental findings (cond-mat/0503478) which evidence the presence of a topological defect in the bilayer system.Comment: 9 pages, 3 figure

Three-Dimensional Magnetotelluric Characterization of the Travale Geothermal Field (Italy) Remote Sens. 2022, 14, 542.

The geoelectrical features of the Travale geothermal field (Italy), one of the most productive geothermal fields in the world, have been investigated by means of three-dimensional (3D) magnetotelluric (MT) data inversion. This study presents the first resistivity model of the Travale geothermal field derived from derivative-based 3D MT inversion. We analyzed MT data that have been acquired in Travale over the past decades in order to determine its geoelectrical dimensionality, directionality, and phase tensor properties. We selected data from 51 MT sites for 3D inversion. We carried out a number of 3D MT inversion tests by changing the type of data to be inverted, the inclusion of static-shift correction at some sites where new time-domain electromagnetic soundings (TDEM) were acquired, the grid rotation, as well as the starting model in order to assess the connection between the inversion model and the geology. The final 3D model herein presents deep elongated resistive bodies between the depths of 1.5 and 8 km. They are transverse to the Apennine structures and suggest a correlation with the strike-slip tectonics. Comparison with a seismic velocity model and well log data suggests a highly-fractured volume of rocks with vapor-dominated circulation. The outcome of this study provides new insights into the complex geothermal system of Travale

Minerals, Amino Acids and Essential Oil Contents of Ethanol Extracts from Seeds and Pulps of Artocarpus Heterophyllus

Artocarpus heterophyllus is shown to be one amongst several plants shown to be blindly used by locals as nutritional supplements and for therapeutic purposes. This study examined comparatively the nutritional potentials of the seeds and pulps of Artocarpus heterophyllus. The minerals, amino acids and essential oil contents of ethanol extracts from seed and pulp of Artocarpus heterophyllus was evaluated using standard laboratory methods. Results shows that, the seed has the highest amino acid content, with glutamine being the highest in the seed (23.24g/100g) as compared to the pulp (21.74g/100g). The mineral content analysis shows that the pulp is rich in manganese (0.66mg/kg) while the seed is richest in potassium (0.6mg/kg). Iron (0.42mg/kg) and Calcium (0.42mg/kg) were observed to be higher also in the pulp. The totality of the mineral content is however, greater in the pulp than in the seed. The seed and the pulp of A. heterophyllus were found to contain almost the same quantity of essential oils, with the seed having higher varieties of essential oils. The study revealed that the ethanol extracts of the seed and pulp of A. heterophyllus are of high nutritional values as essentials minerals, oils and amino acids were seen present in the samples. Keywords: Artocarpus Heterophyllus, Minerals contents, essential oils, amino acids, Ethanol Extract DOI: 10.7176/JBAH/14-1-07 Publication date: April 30th 202

Genetic defects of GDF6 in the zebrafish out of sight mutant and in human eye developmental anomalies

Contains fulltext : 88522.pdf (publisher's version ) (Open Access)BACKGROUND: The size of the vertebrate eye and the retina is likely to be controlled at several stages of embryogenesis by mechanisms that affect cell cycle length as well as cell survival. A mutation in the zebrafish out of sight (out) locus results in a particularly severe reduction of eye size. The goal of this study is to characterize the outm233 mutant, and to determine whether mutations in the out gene cause microphthalmia in humans. RESULTS: In this study, we show that the severe reduction of eye size in the outm233 mutant is caused by a mutation in the zebrafish gdf6a gene. Despite the small eye size, the overall retinal architecture appears largely intact, and immunohistochemical studies confirm that all major cell types are present in outm233 retinae. Subtle cell fate and patterning changes are present predominantly in amacrine interneurons. Acridine orange and TUNEL staining reveal that the levels of apoptosis are abnormally high in outm233 mutant eyes during early neurogenesis. Mutation analysis of the GDF6 gene in 200 patients with microphthalmia revealed amino acid substitutions in four of them. In two patients additional skeletal defects were observed. CONCLUSIONS: This study confirms the essential role of GDF6 in the regulation of vertebrate eye size. The reduced eye size in the zebrafish outm233 mutant is likely to be caused by a transient wave of apoptosis at the onset of neurogenesis. Amino acid substitutions in GDF6 were detected in 4 (2%) of 200 patients with microphthalmia. In two patients different skeletal defects were also observed, suggesting pleitrophic effects of GDF6 variants. Parents carrying these variants are asymptomatic, suggesting that GDF6 sequence alterations are likely to contribute to the phenotype, but are not the sole cause of the disease. Variable expressivity and penetrance suggest a complex non-Mendelian inheritance pattern where other genetic factors may influence the outcome of the phenotype