Search results for "AAS"
showing 10 items of 1173 documents
The effect of experimental lead pollution on DNA methylation in a wild bird population
2021
Anthropogenic pollution is known to negatively influence an organism’s physiology, behaviour, and fitness. Epigenetic regulation, such as DNA methylation, has been hypothesized as a potential mechanism to mediate such effects, yet studies in wild species are lacking. We first investigated the effects of early-life exposure to the heavy metal lead (Pb) on DNA methylation levels in a wild population of great tits (Parus major), by experimentally exposing nestlings to Pb at environmentally relevant levels. Secondly, we compared nestling DNA methylation from a population exposed to long-term heavy metal pollution (close to a copper smelter), where birds suffer from pollution-related decrease in…
La Europa social / 4. La demolición
2005
Poverty and Tax Exemptions in Mid-Nineteenth Century Finland
2017
The topic of this article is the nature and social character of Finnish rural poverty during the early stages of industrialization. Specifically, I analyze households exempted from two separate taxes in order to locate and study the rural poor. Contrary to several previous considerations deeming taxation sources unreliable in poverty studies, it is shown that under controlled settings tax exemption information does display promising features. These include a high exemption percentage of households without adult male members, small average household size of the tax exempted and a clear concentration of the exemptions on the lower rural social classes. My findings also highlight the fact that…
Study of the flying geese theory from a political point of view : a Japanese propaganda argument in the post world war II era
2009
The Flying Geese Theory (gankoo keitai hattenron 雁行形態発展論), dating from 1932, is one of the rare cases of a scientific theory that was used as a part of Japanese wartime propaganda, and which also survived and succeeded in the postwar era. It was used to legitimize the 'New Order in East Asia (TōA shinchitsujo 東亜新秩序) in 1938, and the new formulation of the 'Greater East Asia Co-Prosperity Sphere‘ (Dai TōA kyōeiken大東亜共栄圏) in 1940. Later in the 1980s the Flying Geese Theory/Pattern became the most successful candidate for explaining the expansion of ‗Asian economical miracles‘ in the postwar era. This study focuses on this famous piece of economical and political rhetoric. The intention is to …
Organizational dissent and workplace freedom of speech : a qualitative study of young professional intra-urban migrant workers in Shanghai
2014
Chinese economy reform triggered the largest domestic labor migration in human history. These 150 million migrant workers are treated as second-rate citizens in urban cities because of the discriminatory household registration system: Hukou. Previous studies have predominantly focused on blue-collar migrants while the professional workers, the potential permanent city dwellers, received little attention. This study attempts to fill this gap by exploring the perception of workplace freedom and preference of dissent strategy among professional migrant workers in Shanghai. Eight young and well-educated migrants participated in this study through semi-structured online interviews. This study no…
Toxicity of binary mixtures of Cu, Cr and As to the earthworm Eisenia andrei
2020
AbstractChromated copper arsenate (CCA) mixtures were used in the past for wood preservation, leading to large scale soil contamination. This study aimed at contributing to the risk assessment of CCA-contaminated soils by assessing the toxicity of binary mixtures of copper, chromium and arsenic to the earthworm Eisenia andrei in OECD artificial soil. Mixture effects were related to reference models of Concentration Addition (CA) and Independent Action (IA) using the MIXTOX model, with effects being related to total and available (H2O and 0.01 M CaCl2 extractable) concentrations in the soil. Since only in mixtures with arsenic dose-related mortality occurred (LC50 92.5 mg/kg dry soil), it wa…
Distribution of Cr and Pb in artificial sea water and their sorption in marine sediments: an example from experimental mesocosms
2016
The uptake of two heavy metals (chromium and lead) in sediments in experimental mesocosms under exposure to different metal concentrations was evaluated by monitoring their concentrations over time both in seawater and in sediment. Two separate experiments under laboratory-controlled conditions were carried out for the two metals. Sediments were collected from a protected natural area characterized by low anthropic influence and were placed in mesocosms that were housed in aquaria each with seawater at a different metal concentration. At pre-established time intervals, seawater and sediment samples were collected from each mesocosm for chemical analyses. Quantification of chromium and lead …
An uptake and elimination kinetics approach to assess the bioavailability of chromium, copper, and arsenic to earthworms (Eisenia andrei) in contamin…
2019
The aim of this study was to determine the bioavailability of metals in field soils contaminated with chromated copper arsenate (CCA) mixtures. The uptake and elimination kinetics of chromium, copper, and arsenic were assessed in the earthworm Eisenia andrei exposed to soils from a gradient of CCA wood preservative contamination near Hartola, Finland. In soils contaminated with 1480–1590 mg Cr/kg dry soil, 642–791 mg Cu/kg dry soil, and 850–2810 mg Ag/kg dry soil, uptake and elimination kinetics patterns were similar for Cr and Cu. Both metals were rapidly taken up and rapidly excreted by Eisenia andrei with equilibrium reached within 1 day. The metalloid As, however, showed very slow uptak…
Large stocks of peatland carbon and nitrogen are vulnerable to permafrost thaw
2020
Significance Over many millennia, northern peatlands have accumulated large amounts of carbon and nitrogen, thus cooling the global climate. Over shorter timescales, peatland disturbances can trigger losses of peat and release of greenhouses gases. Despite their importance to the global climate, peatlands remain poorly mapped, and the vulnerability of permafrost peatlands to warming is uncertain. This study compiles over 7,000 field observations to present a data-driven map of northern peatlands and their carbon and nitrogen stocks. We use these maps to model the impact of permafrost thaw on peatlands and find that warming will likely shift the greenhouse gas balance of northern peatlands. …
El demonio social en la Constitución / 3
2004
Este artículo forma un bloque junto a "Ambiciones de un europeísta (1)" (El País, 2 de octubre de 2004); "Matria Europa, 2" (El País, 16 de octubre de 2004) y "Prisas intergubernamentales / 4" (El País, 30 de obtubre de 2004).