Search results for "vaikutukset"
showing 10 items of 469 documents
Biological interactions in the boreal ecosystem under climate change : are the vole and predator cycles disappearing?
2014
Weight loss induces changes in adaptive thermogenesis in female and male physique athletes
2023
Physique athletes lose substantial weight preparing for competitions, potentially altering systemic metabolism. We investigated sex differences in body composition, resting energy expenditure (REE), and appetite-regulating and thyroid hormone changes during a competition preparation among drug-free physique athletes. The participants were female (10 competing (COMP) and 10 nondieting controls (CTRL)) and male (13 COMP and 10 CTRL) physique athletes. COMP were tested before they started their diet 23 weeks before competing (PRE), during their diet one week before competing (MID), and 23 weeks after competing (POST), whereas CTRL were tested at similar intervals but did not diet. Measurement…
Comprehensive school reform and labor market outcomes over the lifecycle: Evidence from Finland
2021
This study focused on the labor market effects of the Finnish comprehensive school reform in 1972–1977 over the lifecycle. The reform increased the age at which students are separated into vocational and general tracks from 11 to 16 as well as updated the curriculum to include more general content instead of vocational. Using longitudinal administrative register data and exploiting the gradual implementation of the reform, I found a negative effect on employment in early career and a positive effect later in the lifecycle. Results for labor earnings are more nuanced and sensitive to different model specifications, but a positive effect was found in the late career. After the reform, the tre…
Prosociality as a mediator between teacher collaboration and turnover intention
2019
PurposeThe purpose of this paper is to investigate the mediating role of prosociality, which is defined in terms of helping and benefitting others, between teacher collaboration and their turnover intentions. Prosociality was measured as prosocial impact and prosocial motivation.Design/methodology/approachThis study was conducted through a cross-sectional survey of 260 elementary and junior high school teachers in Japan. A structural equational model was employed to examine the mediating roles of prosocial impact and prosocial motivation in the relationships between teacher collaboration and their turnover intention.FindingsThe results, first, supported the hypotheses: the high perception o…
In the shadow of COVID-19: A randomized controlled online ACT trial promoting adolescent psychological flexibility and self-compassion.
2023
Background Although some adolescents managed to cope well with the challenges brought on by the COVID-19 pandemic, the well-being of many was adversely affected due to school closures, distance education, restrictions on gathering with friends, and limited access to mental health services. Many adolescents reported increased anxiety and depression as well as decreased psychological wellbeing due to the pandemic. Consequently, there is a need for psychological support that exceeds the strained resources available to schools to support young people during times of crisis and societal pressure. Objective The present study aimed to explore the effects of an online-delivered ACT intervention to …
Boreal fishes and ultraviolet radiation : actions of UVR at molecular and individual levels
2005
Eeva-Riikka Vehniäinen on väitöskirjatyössään tutkinut UV-säteilyn vaikutuksia siian, hauen ja muikun poikasissa. Ihmisen aiheuttama otsonikerroksen ohentuminen on lisännyt maan pinnalle saapuvan ultravioletti-B-säteilyn (UVB) määrää viime vuosikymmenten aikana, ja lisääntymisen odotetaan jatkuvan vielä noin 2050-luvulle saakka. UVB-säteily on haitallista eliöille, koska se aiheuttaa vaurioita solun keskeisissä rakenteissa: DNA:ssa, proteiineissa ja lipideissä.Vehniäinen arvioi lisääntyvän UVB-säteilyn aiheuttamaa riskiä taloudellisesti ja ekologisesti tärkeille makeanveden kalalajeillemme, siialle, muikulle ja hauelle, niiden herkimmässä elämänvaiheessa välittömästi kuoriutumisen jälkeen. …
Turvetuotannon diskurssit paikallisen tiedon näkökulmasta Saarijärven reitillä
2013
Suomessa käydään poliittista keskustelua turvetuotannon hyödyistä ja haitoista. Tähän keskusteluun ovat aktiivisesti osallistuneet myös kansalaiset ja eri järjestöt. Keskustelujen ytimessä on kiista mitatun tiedon ja havaintojen välisestä ristiriidasta ja luotettavuudesta. Viitekehyksenä tutkimuksessa käytetään sosiaalista konstruktionismia. Sosiaalisen konstruktionismin mukaisesti huomiota kiinnitetään itsestäänselvyyksinä pidettyihin asioihin sekä käsitystemme historialliseen ja kulttuuriseen sidonnaisuuteen. Tutkimuksessa selvitetään kriittisen diskurssianalyysin menetelmin ovatko Saarijärven reitillä tehdyt havainnot muutoksista luotettavia. Paljon aikaa luonnossa viettävillä, esimerkik…
Maternal body mass index, change in weight status from childhood to late adulthood and physical activity in older age
2021
This study aimed to examine the longitudinal associations of maternal body mass index (BMI), weight status in childhood and late adulthood and device-measured total physical activity (TPA) in older age. The study involves 552 participants from Helsinki Birth Cohort Study who were born in Helsinki, Finland, in 1934-1944. TPA was measured with a multisensory body monitor at a mean age of 70 years and expressed in metabolic equivalent of task hours/day (METh/d). Childhood overweight (BMI > 85th percentile) was based on school health records at 6-7 years of age, and late adulthood overweight (BMI >= 25 kg/m(2)) was based on clinical measurements at the mean age of 61 years. Childhood overweight…
Indirect effects of invasive crayfish on native fish parasites
2013
Interactions between invasive and native species are often modified by parasites. One little-studied scenario is that invasive species affect parasite transmission to native hosts by altering the relative abundance of hosts needed in parasite life cycles, for example by predation on these hosts. Here we show that presence of an invasive crayfish species, Pacifastacus leniusculus, decreases the mean abundance of native parasites transmitted from snails and aquatic isopods to perch, Perca fluviatilis, in two large boreal lakes in Finland. In contrast, parasites transmitted to the fish from planktonic copepods or mussels, hosts not readily preyed on by crayfish, were not affected by crayfish p…
Glyphosate residues alter the microbiota of a perennial weed with a minimal indirect impact on plant performance
2021
Abstract Purpose In cold climates, glyphosate residues may linger in soils, with effects on plant–microbe interactions and, consequently, plant performance. Here, we explore the influence of glyphosate residues on the endophytic microbiota (bacteria and fungi) and performance of the perennial nitrogen-fixing weed Lupinus polyphyllus. Methods In a common garden, we grew plants from six populations of L. polyphyllus in glyphosate-treated or untreated control soils, with or without additional phosphorus. We sampled plant microbiota (leaves, roots, nodules) and assessed plant performance based on six traits: height, retrogression probability (i.e. shrinkage), biomass, root:shoot ratio, nodule n…