Search results for "Pirati"

Effects of earthworms on decomposition and metal availability in contaminated soil: Microcosm studies of populations with different exposure histories

2006

Abstract Population-specific differences in the responses of earthworms to simultaneous exposure to Cu and Zn were studied in microcosm experiments. Two populations of Aporrectodea caliginosa tuberculata (Eisen) with different metal exposure histories were chosen for the studies. Microcosms were prepared containing either uncontaminated soil or soils with low or high combined Cu/Zn -concentrations (79/139 or 178/311 mg kg −1 dry mass of soil, respectively). Earthworms from each population were introduced to the microcosm treatments with some microcosms serving as controls without earthworms. One series of microcosms was destructively sampled after 16 weeks incubation in a climate chamber. S…

The use of shallow dripwater as an isotopic marker of seepage in karst areas: A comparison between Western Sicily (Italy) and the Harz Mountains (Ger…

2013

Abstract The isotopic signature of slow-flowing dripwater collected in caves located in Western Sicily (Italy) was determined for evaluating its possible use as an isotopic tracer of the local groundwater recharge. These spot measures were compared with a longer series of local rain and spring compositions and with other samples taken, under different hydrogeological conditions, in caves of the Harz Mountains (Northern Germany). The slow flowing dripwater from Sicily showed δ 18 O/δD ratios similar to those of local rain and groundwater, demonstrating that these three are all parent waters. A parallel similarity was found in the vertical isotopic gradient (Δδ 18 O) of the three groups of wa…

Aspiration development among rural youth : case study Liceo Rural Sámara

2017

The aim of this thesis is to provide a preliminary analysis of the aspirations of rural youth in Sámara, Costa Rica and the factors influencing them. This study will supplement the existing literature on aspirations, while providing a new approach to this field. By assessing which factors are most influential to youth’s development of aspirations this study hopes to provide information which can help to improve infrastructure for the development of aspirations in the future. The ultimate goal is to guide future structural changes to promote the development and realization of youth’s aspirations. The study implements an actor-centered approach by utilizing questionnaire data gathered in the …

Impact of biliary stents on the diagnostic accuracy of EUS-guided fine-needle biopsy of solid pancreatic head lesions: A multicenter study

2021

Background and Objectives: There is no clear evidence of a negative impact of biliary stents on the diagnostic yield of EUS-guided fine-needle biopsy (EUS-FNB) for diagnosing pancreatic head lesions. We aimed to evaluate the association between the presence of biliary stents and the diagnostic accuracy of EUS-FNB. Materials and Methods: A multicenter retrospective study including all jaundiced patients secondary to pancreatic head masses was performed. Patients were divided into two groups according to the presence of a biliary stent placed before EUS-FNB. Pathological results were classified according to the Papanicolaou classification and compared against the final diagnosis. Diagnostic m…

Influence of littoral periphyton on whole-lake metabolism relates to littoral vegetation in humic lakes

2017

The role of littoral habitats in lake metabolism has been underrated, especially in humic lakes, based on an assumption of low benthic primary production (PP) due to low light penetration into water. This assumption has been challenged by recent recognition of littoral epiphyton dominance of whole-lake PP in a small highly humic lake and of epiphyton as an important basal food source for humic lake biota. However, as these studies have mostly concerned single lakes, there is a need to test their wider generality. We studied the whole-lake PP and community respiration (CR) in eight small humic lakes in southern Finland during July 2015 using 14C incorporation to measure pelagic PP and the ch…

Identité d’habitation et fréquentation des espaces verts urbains : une approche par comportements auto-rapportés

2022

IntroductionLa récente crise sanitaire de la Covid-19 et les confinements qui en ont résulté ont remis en lumière l’importance de l’accès aux espaces verts urbains comme facteur de qualité de vie des citadins. Les bénéfices divers liés à ces espaces sont aujourd’hui bien documentés : amélioration de la santé physique et mentale, création d’îlots de fraicheur ou encore lieux propices aux activités physiques (Schindler et al., 2022). Bien que ces espaces aient acquis une véritable importance sociale, ils sont aujourd’hui potentiellement menacés par les politiques de densification menées dans les espaces urbains, dont l’objectif est la réduction des mobilités motorisées et de la consommation f…

Application of energy balance models for actual evapotranspiration assessment by means of airborne and satellite remote sensing data

2008

Effects of morphology on watershed actual evapotranspiration estimation by means of SEBAL model

2008

Comparative analysis of surface energy balance models for actual evapotranspiration estimation through remotely sensed images

2012

Variation characteristics of soil respiration fluxes in four types of grassland communities under different precipitation intensity

2005

A two consecutive years’ field experiment was carried out on four types of semiarid grassland along precipitation gradient in Xilin River Basin of Inner Mongolia during 2001–2003 using a static enclosed black chamber technique. The variation characteristics of soil respiration fluxes from four different types of grassland along precipitation gradient were compared. The possible effect of water-heat factors on characteristics of grassland soil respiration was statistically analyzed and the numerical relational model between soil respiration and water-heat factors was established. Meanwhile the soil CO2 annual emissions of different types of grassland were estimated based on the consecutive a…