Search results for "BAR"
showing 10 items of 7176 documents
Veģetācijas saistība ar gruntsūdens ķīmisko sastāvu Toras upes piekrastē
2022
Lai plānotu un īstenotu efektīvāku ūdensteču aizsardzības sistēmu, ir būtiski saprast, kā veģetācija ar atšķirīgu sugu sastāvu un struktūru ietekmē ūdens kvalitāti. Šim nolūkam tika izvēlēts Toras upes posms AS “Latvijas valsts meži” apsaimniekotā mežu masīvā, kur, izmantojot transekšu – parauglaukumu metodi, raksturota aizsargjoslas veģetācija un upes piekrastē no gruntsūdens akām deviņu mēnešu periodā ievākti ķīmisko analīžu dati. Pētījuma rezultāti norāda uz tendenci, ka piekrastē, kurā dominē lapu koki, gruntsūdenī ir lielāka izšķīdušā organiskā oglekļa un slāpekļa savienojumu koncentrācija. Slāpekļa koncentrācija gruntsūdenī, iespējams, palielinās arī mežsaimniecisko darbību ietekmē. K…
The role of symbiotic arbuscular mycorrhizal fungi (Glomeromycota) in roots of the host plant Deschampsia flexuosa in vegetation succession of inland…
2013
Suurin osa maalla elävistä putkilokasvilajeista ja -heimoista elää symbioosissa mykorritsasienten kanssa. Mykorritsatyyppejä on useita, ja näistä yleisin ja vanhin on arbuskelimykorritsasymbioosi, jossa Glomeromycota-sienet muodostavat arbuskelimykorritsaa (AM) kasvien juurien sisällä. Tämä kasvin ja sienen välinen tiivis suhde on molempia osapuolia hyödyttävä symbioosi. Toisenvarainen AM sieni on riippuvainen kasvin tuottamasta orgaanisesta hiilestä, ja vastapalveluksena sieni voi parantaa kasvin ravinteiden- ja vedenottokykyä, sekä suojata tätä taudinaiheuttajilta, tuhohyönteisiltä ja laiduntajilta, sekä parantaa kasvin kuivuudensietokykyä. Vaikuttamalla isäntäkasvien kasvuun ja resurssie…
Intracranial Venous Alteration in Patients With Aneurysmal Subarachnoid Hemorrhage: Protocol for the Prospective and Observational SAH Multicenter St…
2022
BackgroundArterial vasospasm has been ascribed as the responsible etiology of delayed cerebral infarction in patients with aneurysmal subarachnoid hemorrhage (aSAH), but other neurovascular structures may be involved. We present the protocol for a multicenter, prospective, observational study focused on analyzing morphological changes in cerebral veins of patients with aSAH.Methods and AnalysisIn a retrospective arm, we will collect head arterial and venous CT angiograms (CTA) of 50 patients with aSAH and 50 matching healthy controls at days 0–2 and 7–10, comparing morphological venous changes. A multicenter prospective observational study will follow. Patients aged ≥18 years of any gender …
Challenges to the development of energy performance measurement : a systems thinking approach
2016
Growing global energy consumption and its consequent hindrance to sus-tainable development poses one of the greatest challenges of today. Impro-vement of the end-use energy efficiency is commonly regarded as one of the most basic and significant countermeasures for curbing the rising energy needs. However, it seems that the progress of end-use energy management is currently hindered due to the complexities involved in the measurement and management of energy efficiency. In essence, the lack of appropriate energy performance metrics constitute a gap between the current organizational needs and scientific literature. Furthermore, the current scientific debate has questioned whether ener-gy ef…
L'age d'or de la sémiotique littéraire, et quelques consequences théoriques
2015
Dans cet article, je voudrais comparer trois livres fondamentaux pour l’analyse sémiotique des œuvres littéraires, parus à quelques années de distance l’un de l’autre : S/Z de Roland Barthes (1970a), Maupassant de Algirdas J. Greimas (1976) et Lector in fabula de Umberto Eco (1979). Il s’agit de trois différentes approches à la sémiotique de la littérature, parues dans la même décennie, qui, par conséquent, ont produit trois différents objets de la discipline, en causant, avec un progrès considérable dans la recherche sur la signification, des équivoques théoriques qui sont encore à résoudre.
L'Age du Bronze à Barbuise-Courtavant (Aube) du XIXe siècle... à demain
2004
International audience
Caractérisation et diagenèse thermique des roches mères pétrolières de la série des Schistes d'âge néocomien moyen-barrémien dans le bassin intérieur…
2006
8 pages; International audience
Grazing intensity in subarctic tundra affects the temperature adaptation of soil microbial communities
2015
Abstract Grazing by large ungulates, such as reindeer (Rangifer tarandus L.), in subarctic tundra exerts a considerable effect on the soil microclimate. Because of higher insulation by the aboveground vegetation in light versus heavily grazed areas, soil temperatures during the growing season are considerably higher under heavy grazing. Here, we hypothesized that these grazer-induced changes in soil microclimate affect the temperature sensitivity of soil microbial activity. To test this hypothesis, we conducted soil incubations at different temperatures (4 °C, 9 °C and 14 °C) for six weeks using soils from sites with contrasting long-term grazing intensities. Microbial respiration at low te…
Democracy, poverty and civil society in Mozambique
2015
National elections were held in Mozambique for the fifth time in October 2014. As a state, Mozambique – like many ‘fourth-wave’ transition countries – fulfils the formal criteria of democracy. But to what extent are the mechanisms of accountability implemented? In Africa, two issues have been identified as key impediments for successful democratic transition: failure to improve the welfare of the poor and the ‘pre-modern’ character of civil society. In Mozambique, robust economic growth has been accompanied by growing inequality, while traditional civil society organisations (CSOs) have become increasingly visible on local level since the political transition in 1994. Based on the analysis …