Search results for "meta-analyysi"

A review of the importance of mineral nitrogen cycling in the plant-soil-microbe system of permafrost-affected soils : changing the paradigm

2022

The paradigm that permafrost-affected soils show restricted mineral nitrogen (N) cycling in favor of organic N compounds is based on the observation that net N mineralization rates in these cold climates are negligible. However, we find here that this perception is wrong. By synthesizing published data on N cycling in the plant-soil-microbe system of permafrost ecosystems we show that gross ammonification and nitrification rates in active layers were of similar magnitude and showed a similar dependence on soil organic carbon (C) and total N concentrations as observed in temperate and tropical systems. Moreover, high protein depolymerization rates and only marginal effects of C:N stoichiomet…

Are woodland key habitats biodiversity hotspots in boreal forests?

2011

Background: The concept of Woodland Key Habitats (WKH, small-scaled presumed hotspots of biodiversity) has become an essential component of forest management in Fennoscandian and Baltic countries. There have been debates over the importance of WKHs in relation to production forests, and several research projects have focused on differences in biodiversity between the two. Results have been contradictory, and thus there is a need to summarize and clarify the existing knowledge. - Objectives: Our objective was to summarize knowledge on comparisons of several biodiversity qualities between WKHs and production forests in relevant countries i.e. the countries where WKH concept has been implement…

Osteoprotegerin and Cardiovascular Events in High-Risk Populations: Meta-Analysis of 19 Prospective Studies Involving 27450 Participants

2018

Background Osteoprotegerin is a cytokine involved in bone metabolism as well as vascular calcification and atherogenesis. Although circulating osteoprotegerin levels are robustly associated with incident cardiovascular disease (CVD) in the general population, its relevance as a biomarker among populations at high CVD risk is less clear. Methods and Results Three independent reviewers systematically searched PubMed, EMBASE, and Web of Science to identify prospective studies that had recruited participants on the basis of having conditions related to high CVD risk. A total of 19 studies were eligible for inclusion, reporting on 27 450 patients with diabetes mellitus (2 studies), kidney diseas…

Genome-wide meta-analyses of multiancestry cohorts identify multiple new susceptibility loci for refractive error and myopia

2013

Refractive error is the most common eye disorder worldwide and is a prominent cause of blindness. Myopia affects over 30% of Western populations and up to 80% of Asians. The CREAM consortium conducted genome-wide meta-analyses, including 37,382 individuals from 27 studies of European ancestry and 8,376 from 5 Asian cohorts. We identified 16 new loci for refractive error in individuals of European ancestry, of which 8 were shared with Asians. Combined analysis identified 8 additional associated loci. The new loci include candidate genes with functions in neurotransmission (GRIA4), ion transport (KCNQ5), retinoic acid metabolism (RDH5), extracellular matrix remodeling (LAMA2 and BMP2) and eye…

Study of the Contribution of Research into Women Entrepreneurship : A Meta-analysis of Discourses in the Literature using ATLAS.ti

2015

Abstract: In this paper, we have analyzed how existing literature contributes to women entrepreneurship research in terms of theoretical, methodological and practical ways of understanding. Based on relevant contents and discourses, a main line within the trend of development can be seen as women entrepreneurship shifting from a marginalized discipline to a more multi-dimensional research concept. Certain representative issues evoke development or are even being left as “atheoretical” at some point; the “alternative” angle is accordingly significant for an in-depth exploration through the relevant materials. The literature resources are chosen with close attention to the keywords “women ent…

Etäteknologian vaikuttavuus vyötärön ympärysmittaan ja rasvaprosenttiin liikuntaa sisältävissä painonpudotusinterventioissa : järjestelmällinen kirja…

2017

Teknologian vaikuttavuutta painonhallintaan on tutkittu paljon, mutta tulokset ovat olleet ristiriitaisia (Hutchesson ym. 2015). Painonpudotustutkimuksissa tulosmuuttujina on yleensä ollut kehon massa tai painoindeksi. Nämä eivät kuitenkaan erottele lihaksiin liittyvää massaa rasvaan liittyvästä massasta. Tämän tutkimuksen tarkoituksena oli tutkia etäteknologian vaikuttavuutta vyötärön ympärysmittaan ja rasvaprosenttiin liikuntaa sisältävissä painonpudotusinterventiossa verrattuna tavanomaiseen hoitoon. Aineistoa kerättiin kahdeksasta tietokannasta: EMBASE, CENTRAL, Ovid MEDLINE, CINAHL, PsycINFO, PEDro, WoS sekä OT-Seeker. Haku tehtiin ajalta 1/2000 – 1/2016 hyödyntäen Cochrane-katsausten …

The meaning of peer group mentoring in the university context

2019

Peer mentoring is commonly used for didactical and learning purposes. In this study we examine peer group mentoring in the university context. The aim is to promote understanding of peer group mentoring based on a meta-analysis of two primary studies: teacher students and teacher group tutors. As a result, three core categories were found: 1) Individual’s participation in the group, 2) Professional development with others and 3) Community enabling sharing and development. These were hierarchically organized and there are critical aspects placed in between the core categories. Professional and personal experiences intertwine to enhance participants’ self-understanding and professional develo…

Effects of different lower-limb sensory stimulation strategies on postural regulation : A systematic review and meta-analysis

2017

Systematic reviews of balance control have tended to only focus on the effects of single lower-limb stimulation strategies, and a current limitation is the lack of comparison between different relevant stimulation strategies. The aim of this systematic review and meta-analysis was to examine evidence of effects of different lower-limb sensory stimulation strategies on postural regulation and stability. Moderate- to high- pooled effect sizes (Unbiased (Hedges’ g) standardized mean differences (SMD) = 0.31–0.66) were observed with the addition of noise in a Stochastic Resonance Stimulation Strategy (SRSS), in three populations (i.e., healthy young adults, older adults, and individuals with lo…

Liikunta voi toimia hoitona lievissä ja keskivaikeissa masennusoireissa

2022

Suicide and depression in former contact sports participants: population-based cohort study, systematic review, and meta-analysis

2022

SummaryBackgroundTraumatic brain injury is associated with the future risk of depression and suicide, and this raises the possibility that former participants in sports characterised by low intensity repetitive head impact may also subsequently experience an increased burden of these mental health outcomes. Using new data from a cohort study integrated into a meta-analysis of the current evidence, we compared the occurrence of depression and suicide in former contact sports athletes against general population controls.MethodsThe cohort study comprised 2004 retired male athletes who had competed internationally on an amateur basis for Finland between 1920 and 1965, and 1385 age-equivalent ma…