Search results for "uutto"
showing 10 items of 279 documents
Wood-decaying fungi in old-growth boreal forest fragments: extinctions and colonizations over 20 years
2021
According to ecology theory, isolated habitat fragments cannot maintain populations of specialized species. Yet, empirical evidence based on monitoring of the same fragments over time is still limited. We studied the colonizationâextinction dynamics of eight wood-decaying fungal species in 16 old-growth forest fragments (<14 ha) over a 20-year period (1997â2017). We observed 19 extinctions and 5 colonizations; yet, the distribution of extinctions and colonizations did not differ from the one expected by chance for any of the species. Twenty-six percent of the extinctions took place in two natural fragments amid large forestâpeatland complexes. (Romell) Bourdot and Galzin decreased …
From Norway Spruce Bark to Carbon Foams : Characterization, and Applications
2020
Fresh bark from spruce Picea abies was milled and extracted with hot water. The extracts were purified in a number of steps in order to get tannin-extracts pure enough to prepare tannin-based carbon foams. The chemical composition of the extracts were analyzed. The foams were maturated and thermally treated to obtain desired properties, such as specific surface area, porosity, and compressive strength. It was possible to produce carbon foams even if they contained carbohydrate impurities. Differences in the properties of the carbon foams such as compressive strength, specific surface areas, and pore size distributions might be related to the compositions of the extracts. The foams were fina…
Resource use of wood-inhabiting fungi in different boreal forest types
2017
Generalist species are usually widespread and abundant, and thrive in heterogeneous environments. Specialists, in turn, are generally more restricted in their range, and benefit from more stable conditions. Therefore, increasing human-induced disturbance can have more negative effects on specialist than generalist species. We assessed the specialization of 77 wood-inhabiting fungal species across seven boreal forest types and different substratum qualities. A significantly higher number of specialist species was associated with herb-rich forests and afforested fields than with managed coniferous forests and wood pastures, the number of specialists associated with natural coniferous forests …
Spatio-temporal dynamics of density-dependent dispersal during a population colonisation
2019
Predicting population colonisations requires understanding how spatio‐temporal changes in density affect dispersal. Density can inform on fitness prospects, acting as a cue for either habitat quality, or competition over resources. However, when escaping competition, high local density should only increase emigration if lower‐density patches are available elsewhere. Few empirical studies on dispersal have considered the effects of density at the local and landscape scale simultaneously. To explore this, we analyze 5 years of individual‐based data from an experimental introduction of wild guppies Poecilia reticulata. Natal dispersal showed a decrease in local density dependence as density at…
Effect of Seasonal Storage on Single-Stem Bark Extractives of Norway Spruce (Picea abies)
2021
Increasing the net value of forestry side-streams has both ecological as well as economic benefits for emerging biorefining industries. Spruce bark represents one of the nature’s abundant sources of valuable extractives. In this study, the impact of storage on the quality and quantity of Norway spruce (Picea abies) extractives was examined as a function of storage time, environmental conditions and season (i.e., winter or summer). The bark from stored spruce saw logs was extracted with an accelerated solvent extractor (ASE) at 120 °C with hexane and water. The produced extracts were analysed qualitatively and quantitatively by gas chromatography with a flame ionisation detector (GC-FID) and…
Migrant women, work, and investment in language learning : Two success stories
2019
Abstract In the media, migrant mothers are often portrayed as uneducated, having trouble learning a new language, and preferring to stay at home rather than entering paid employment. This article offers a contrasting point of view as a result of examining how two migrant women narrativize their experiences of language learning and working-life-related integration during a three-year period. Specific attention is paid to how the women make sense of their language use over time, and how this may have contributed to their integration into working life and the wellbeing of their families. Interview data was analyzed using the short story analytical approach, focusing on both the content and the…
Toxicological and bioactivity evaluation of blackcurrant press cake, sea buckthorn leaves and bark from Scots pine and Norway spruce extracts under a…
2021
Aqueous extracts from blackcurrant press cake (BC), Norway spruce bark (NS), Scots pine bark (SP), and sea buckthorn leaves (SB) were obtained using maceration and pressurized hot water and tested for their bioactivities. Maceration provided the extraction of higher dry matter contents, including total phenolics (TPC), anthocyanins, and condensed tannins, which also impacted higher antioxidant activity. NS and SB extracts presented the highest mean values of TPC and antioxidant activity. Individually, NS extract presented high contents of proanthocyanidins, resveratrol, and some phenolic acids. In contrast, SB contained a high concentration of ellagitannins, ellagic acid, and quercetin, exp…
Contesting Family in Finnish and Canadian Immigration and Refugee Policy
2012
Adopting a governmentality perspective, this article explores the multi-conceptuality of family in Finnish and Canadian immigration and refugee policy domains by analyzing official and political discourse. Contestation is found to typically manifest as conflict between Western ‘nuclear’ and non-Western ‘extended’ understandings of family. We argue that family is persistent in immigration and refugee policies of both countries because it continues to be thought of as an effective tool for biopolitical governance of national populations. A closer reading of the contestation over family also reveals competing neoliberal and neoconservative governmental rationalities situated within broader int…
Organizational dissent and workplace freedom of speech : a qualitative study of young professional intra-urban migrant workers in Shanghai
2014
Chinese economy reform triggered the largest domestic labor migration in human history. These 150 million migrant workers are treated as second-rate citizens in urban cities because of the discriminatory household registration system: Hukou. Previous studies have predominantly focused on blue-collar migrants while the professional workers, the potential permanent city dwellers, received little attention. This study attempts to fill this gap by exploring the perception of workplace freedom and preference of dissent strategy among professional migrant workers in Shanghai. Eight young and well-educated migrants participated in this study through semi-structured online interviews. This study no…