Search results for "81"
showing 10 items of 2468 documents
Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous cat…
2013
We traced the origin of dissolved organic matter (DOM) in the large, shallow, eutrophic Lake Vortsjarv in Estonia. Allochthonous DOM (Al-DOM) had higher δ13C values than autochthonous DOM (Au-DOM). The δ13C of inflow DOM varied from −28.2‰ to −25.4‰ (mean −26.7‰) and in-lake DOM varied from −28.4‰ to −26.1‰ (mean −27.2‰). Low stable isotope (SI) signatures of Au-DOM were caused by relatively 13C-depleted values of its precursors (mainly phytoplankton) with mean δ13C of −28.9‰. SI signatures of dissolved inorganic carbon (DIC) in the inflows and in the lake were also relatively low (from −15.1‰ to −3.28‰). SI values of DOM were lower during the active growing season from May to September and…
The effects of long-term drainage and subsequent restoration on water table level and pore water chemistry in boreal peatlands
2014
Summary Degradation by drainage threatens biodiversity and globally important peatland ecosystem functions such as long-term carbon sequestration in peat. Restoration aims at safeguarding peatland values by recovering natural hydrology. Long-term effects of drainage and subsequent restoration, especially related to within-site variation of water table level and pore water chemistry, are poorly known. We studied hydrological variation at 38 boreal Sphagnum peatland sites (pristine, drained and restored) in Finland. The average water table level was significantly lower at Drained than Pristine sites especially near the ditches. We also observed large pore water chemical differences between Dr…
Comparing long term sediment records to current biological quality element data – Implications for bioassessment and management of a eutrophic lake
2012
Defining reference conditions for lakes situated in areas of human settlement and agriculture is rarely straightforward, and is especially difficult within easily eroding and nutrient rich watersheds. We used diatoms, cyanobaterial akinetes, remains of green algae and chironomid head capsules from sediment samples of Lake Kirmanjarvi, Finland, to assess its deviation from the initial ecological status. These site-specific records of change were compared to current type-specific ecological status assessment. All paleolimnological data indicated deviation from natural conditions and mirrored the current, monitoring-based assessment of “moderate” ecological lake status. However, the sediment d…
Veinticinco años de análisis del comportamiento deportivo de la población española (1980-2005)
2006
El estudio de los hábitos deportivos de la población española desde los inicios de la transición democrática hasta mediados de la primera década del siglo XXI, cuenta con una rigurosa base empírica de resultados, ya que en el periodo 1980-2005 se han llevado a cabo con una periodicidad quinquenal seis encuestas probabilísticas de alcance nacional con una continuidad tanto en su patrocinio, el Consejo Superior de Deportes, como en el instituto de investigación que ha realizado las encuestas, el Centro de Investigaciones Sociológicas, y en la dirección de la investigación y análisis y publicación de los resultados. En este trabajo se presenta un análisis resumido y diacrónico de los resultado…
La vocalidad del violín en el norte de Italia en torno a 1600
2021
Throughout the present research I intend to demonstrate the powerful link between the vocal practice in accompanied monody and the way Early Italian violin music ought to be interpreted. Due to the scarce amount of articulation and ornamentation in this music, I consider that historical criteria should be found in order to back up the subjective choices in its performance. According to this, I focus on reviewing sources that describe the vocal practice around 1600, but also contemporary sources in which we can find instructions addressed to bow instruments. Besides, a catalogue of articulations and ornamentations present in early editions of printed violin music is attached. Last, I comment…
Sammenhengen mellom overvekt, selvbilde og fysisk aktivitet hos ungdom
2006
Masteroppgave i idrettsvitenskap, Høgskolen i Agder Kristiansand 2006 Bakgrunn: En økende forekomst av overvekt og fedme blant barn og unge også i Norge er grunnlaget for denne studien. Det har vært relativt mye forskning hvor en har undersøkt de fysiologiske konsekvensene av overvekt, men det har til sammenligning vært lite forsking på hvordan overvekt påvirker psykososiale forhold. Formål: Formålet med denne oppgaven har vært å belyse temaet overvekt og ungdom gjennom variablene selvbilde, kroppsbilde og fysisk aktivitetsnivå. Først ble det undersøkt om det var kjønnsforskejller på hver av disse variablene og om det var forskjeller i tilknytning til vekt. På bakgrunn av sammenhengen mello…
National identity predicts public health support during a global pandemic
2022
Funder: Research Council of Norway through its Centres of Excellence Scheme, FAIR project No 262675
Long-Term Consequences of Water Pumping on the Ecosystem Functioning of Lake Sekšu, Latvia
2020
Cultural eutrophication, the process by which pollution due to human activity speeds up natural eutrophication, is a widespread and consequential issue. Here, we present the 85-year history of a small, initially Lobelia&ndash
Effects of landscape composition on hoverflies (Diptera: Syrphidae) in mass-flowering crop fields within forest-dominated landscapes
2022
Agricultural intensification has led to structurally simplified landscapes with reduced and fragmented resources for farmland insects. However, studies on the effects of landscape composition on farmland insects have mainly been performed in areas dominated by open arable land and semi-natural grasslands, while studies from forest-dominated landscapes are scarce. This research examined the effects of landscape composition on hoverfly species richness and abundance in arable land in boreal forest-dominated landscapes. Hoverflies were sampled in 22 mass-flowering caraway (Carum carvi) fields in Central Finland using pan traps. The effects of landscape composition on species richness and abund…
ICR in human cadaveric specimens: An essential parameter to consider in a new lumbar disc prosthesis design.
2020
[EN] Study design Biomechanical study in cadaveric specimens. Background The commercially available lumbar disc prostheses do not reproduce the intact disc's Instantaneous centre of Rotation (ICR), thus inducing an overload on adjacent anatomical structures, promoting secondary degeneration. Aim To examine biomechanical testing of cadaveric lumbar spine specimens in order to evaluate and define the ICR of intact lumbar discs. Material and Methods Twelve cold preserved fresh human cadaveric lumbosacral spine specimens were subjected to computerized tomography (CT), magnetic resonance imaging (MRI) and biomechanical testing. Kinematic studies were performed to analyse range of movements in or…