Search results for "FS"
showing 10 items of 1992 documents
Island selection on mammalian life-histories: genetic differentiation in offspring size
2008
BACKGROUND: Since Darwin's pioneering work, evolutionary changes in isolated island populations of vertebrates have continued to provide the strongest evidence for the theory of natural selection. Besides macro-evolutionary changes, micro-evolutionary changes and the relative importance of natural selection vs. genetic drift are under intense investigation. Our study focuses on the genetic differentiation in morphological and life-history traits in insular populations of a small mammal the bank vole Myodes glareolus. RESULTS: Our results do not support the earlier findings for larger adult size or lower reproductive effort in insular populations of small mammals. However, the individuals li…
Apoptotic-like Leishmania exploit the host´s autophagy machinery to reduce T-cell-mediated parasite elimination
2015
Apoptosis is a well-defined cellular process in which a cell dies, characterized by cell shrinkage and DNA fragmentation. In parasites like Leishmania, the process of apoptosis-like cell death has been described. Moreover upon infection, the apoptotic-like population is essential for disease development, in part by silencing host phagocytes. Nevertheless, the exact mechanism of how apoptosis in unicellular organisms may support infectivity remains unclear. Therefore we investigated the fate of apoptotic-like Leishmania parasites in human host macrophages. Our data showed--in contrast to viable parasites--that apoptotic-like parasites enter an LC3(+), autophagy-like compartment. The compartm…
Longitudinal Stability of Reading Difficulties : Examining the Effects of Measurement Error, Cut-Offs, and Buffer Zones in Identification
2020
This study examined the stability of reading difficulties (RD) from grades 2 to 6 and focused on the effects of measurement error and cut-off selection in the identification of RD and its stability with the use of simulations. It addressed methodological limitations of prior studies by (a) applying a model-based simulation analysis to examine the effects of measurement error and cut-offs in the identification of RD, (b) analyzing a non-English and larger sample, and (c) examining RD in both reading fluency and reading comprehension. Reading fluency and reading comprehension of 1,432 Finnish-speaking children were assessed in grades 2 and 6. In addition to the use of single cut-off points on…
Pre-service and in-service teachers' experiences of inquiry-based primary science teaching : A collaborative team teaching model
2019
This research clarifies how a collaborative team teaching model (CTTM) can support both pre-service and in-service teachers’ professional development in using inquiry-based science teaching in primary schools. The data were collected via a questionnaire-based survey approach after inquiry projects implementation at public schools in four Finnish cities. In total, 98 pre-service teachers and 51 inservice class teachers were involved in the research. According to their experiences collaborative team teaching was seen as an adequate teaching approach in primary school science lessons. Both in-service and pre-service teachers experienced inquirybased science teaching enthusiastically and receiv…
Pre-service teachers and guided inquiry-based science teaching with simulations
2017
The aim of this dissertation was explore the beliefs and practices of pre-service primary teachers on using simulations as a part of guided inquiry-based lessons. Even though research has shown that using simulations to learn science offers certain learning benefits compared to other forms of instruction, their use in Finnish schools is still rare compared to the international average. Teacher training has the potential to promote the use of simulations in primary classrooms. Internationally, research has been called for the role of teachers in learning and teaching with simulations. As a part of this dissertation, an intervention was designed to accustom a group of pre-service teachers to …
78th Scientific Conference. Section: Magnetic Soft Matter: Book of Abstracts
2020
February 14th, 2020; University of Latvia. Faculty of Physics, Mathematics and Optometry; House of Science, Jelgavas 3, Riga, Latvia
Unconventional synthesis and properties of zeolitic imidazolate frameworks and 2D magnetic MOFs
2021
Esta tesis fue planteada para el desarrollo de nuevos polímeros de coordinación y materiales híbridos metalorgánicos (MOFs) basados en rutas sintéticas novedosas en ausencia de disolvente. Esta novedosa metodología de síntesis permite acceder a nuevos materiales inalcanzables por rutas más clásicas como las solvotermales. La tesis se centra en la obtención de materiales basados en Fe(II), el cual es sensible a ser oxidado durante las reacciones de formación de MOFs a Fe(III). Por ello se utilizó una síntesis en ausencia de disolvente en atmosfera inerte compatible con Fe(II). Para ello se utiliza una familia de ligandos sublimables tipo imidazol y metalocenos, como el ferroceno como fuente …
Motivic Pattern Extraction in Music, and Application to the Study of Tunisian Modal Music
2007
A new methodology for automated extraction of repeated patterns in time-series data is presented, aimed in particular at the analysis of musical sequences. The basic principles consists in a search for closed patterns in a multi-dimensional parametric space. It is shown that this basic mechanism needs to be articulated with a periodic pattern discovery system, implying therefore a strict chronological scanning of the time-series data. Thanks to this modelling global pattern filtering may be avoided and rich and highly pertinent results can be obtained. The modelling has been integrated in a collaborative pro ject between ethnomusicology, cognitive sciences and computer science, aimed at the…
Contaminated sediments from dredging activities as modern turbidites: geochemical signatures in box-core sediments from the Augusta area, Ionian Sea,…
2009
The Augusta area (SE Sicily) is one of the most industrialized and contaminated coastal environments in the Mediterranean region, having a relatively high influx of unregulated industrial effluents. Valuable sets of geochemical data (major elements and trace metals), obtained from box-core sediments collected along a transect from the Sicilian coastal zone seawards of Augusta and dated via 210Pb and 137Cs, indicated increased metal contamination (notably Hg) since ca 1940-1950, related to the industrial development of the area. Metal enrichment is considerable in the coastal sediments, being significantly in excess (for Hg and Pb) of background values estimated for the Strait of Sicily. Mor…