Search results for "AAS"

Lumbriculus variegatus (Annelida) biological responses and sediment sequential extractions indicate ecotoxicity of lake sediments contaminated by bio…

2018

Abstract We assessed potential ecotoxicity of lake sediments affected by biomining effluents in northeastern Finland. Growth, reproduction and behavior of the sediment-dwelling oligochaete Lumbriculus variegatus (Muller 1774) were used as ecotoxicity endpoints. Standardized chronic bioassays were used for growth and reproduction, and acute and chronic tests with Multispecies Freshwater Biomonitor (MFB) for behavior assessments. Sequential extractions were used to characterize metal bioavailability and exposure conditions in the sediments, which indicated mining-induced contamination gradients of S, Cu, Ni and U and also bioavailability gradients of S and Ni. Among the ecotoxicity endpoints,…

Toxicity of Mining-Contaminated Lake Sediments to Lumbriculus variegatus

2021

AbstractBoreal lakes with soft water and low buffering capacity are susceptible to excess ion loading resulting from metal mining. The impact of two Finish mining sites in downstream lakes was assessed with a chronic sediment toxicity test using a laboratory-reared freshwater Lumbriculus variegatus (Oligochaeta). The test organisms were exposed to mining-contaminated natural lake sediments and hypolimnion water (HLW) or artificial freshwater (AFW) as overlying water in two independent experimental setups. In both test setups, growth and reproduction of L. variegatus were lower in sediments from the lakes receiving high amount of mining effluents from the mines nearby. In the biomining site,…

The effect of high-In content capping layers on low-density bimodal-sized InAs quantum dots

2013

[EN] The structural and morphological features of bimodal-sized InAs/(In) GaAs quantum dots with density in the low 10(9) cm(-2) range were analyzed with transmission electron microscopy and atomic force microscopy and were related to their optical properties, investigated with photoluminescence and time-resolved photoluminescence. We show that only the family of small quantum dots (QDs) is able to emit narrow photoluminescence peaks characteristic of single-QD spectra; while the behavior of large QDs is attributed to large strain fields that may induce defects affecting their optical properties, decreasing the optical intensity and broadening the homogeneous linewidth. Then, by using a rat…

Kalmbergin kartasto R III : List 7

1855

Kalmbergin kartasto R IV : List 7

1855

Kalmbergin kartasto R IV : List 3

1855

Kalmbergin kartasto R IV : List 4

1855

Kalmbergin kartasto R V : List 3

1855

Lähisuhdeväkivaltaan puuttumisen mahdollisuudet erikoissairaanhoidossa

2011

Tutkimuksessa tarkasteltiin mitkä tekijät auttavat terveydenhuollon työntekijöitä puuttumaan lähisuhdeväkivaltaan. Kiinnostus kohdistui erityisesti siihen, minkä varassa työntekijät rakentavat puuttumista mahdollistavaa puhetta. Analyysissa lähtökohtana oli sosiaalisesti jaettu tieto, eli se, kuinka ihmiset yhdessä tulkitsevat ja rakentavat sosiaalisia ilmiöitä ja niiden merkityksiä. Tutkimusmenetelmänämme on aineistolähtöinen analyysi (Grounded theory). Tutkimuksen aineisto koostuu kuudesta fokusryhmähaastattelusta. Haastattelujen tarkoituksena oli saada selville, millaisia asenteita terveydenhuollon ammattilaisilla on lähisuhdeväkivaltaa ja siihen apua hakevia kohtaan. Tutkimusaineistomme…

SURFACE AND MECHANISTIC PROPERTIES OF RECYCLED BITUMINOUS MIXTURES

2019

EXECUTIVE SUMMARY Problem Often, when the characteristics of a bituminous mixture are analised, there are major differences between in-lab and in-situ results. This is due to the fact that the procedures and techniques implemented during the design phase (in lab) may be different from those used on site. Then, is very important to be able to predict the main properties of a mixture particularly when innovative materials are used. For example, when crumb rubber is used, phisical and volumetric properties of mixes may change over time, in particular due to the swelling phenomenon that it alters different properties of the mixture (e.g., viscosity). This study aims to investigate the main aspe…