Search for dissertations about: "acid rain"

Showing result 1 - 5 of 19 swedish dissertations containing the words acid rain.

  2. 1. What are the effects of natural versus human-caused acidity on stream species diversity and ecosystem functioning?

    Author : Zlatko Petrin; Björn Malmqvist; Steve J. Ormerod; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; acid rain; aquatic insects; biodiversity; ecosystem function; Biology; Biologi;

    Abstract : Human activities have caused acidification of freshwater systems on a large scale resulting in reduced species diversity and ecological functioning in many lakes and streams. However, many naturally acidic freshwater systems have also been found, for instance in northern Sweden. READ MORE

  4. 2. Bioaccessibility of Stainless Steels : Importance of Bulk and Surface Features

    Author : Gunilla Herting; Inger Odnevall Wallinder; Stuart Lyon; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Stainless steel; iron; chromium; nickel; corrosion; metal release; artificial rain; synthetic body fluids; acetic acid; surface oxide; surface finish; Surface and colloid chemistry; Yt- och kolloidkemi;

    Abstract : With increasing environmental awareness, the desire to protect human beings and the environment from adverse effects induced by dispersed metals has become an issue of great concern and interest. New policies, such as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) within the European Community, have been implemented to reduce hazards posed by the use of chemicals on producers and downstream users. READ MORE

  5. 3. Importance of endogenous kynurenic acid in brainm catecholaminergic processes and in the pathophysiology of schizophrenia

    Author : Sophie Erhardt; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Schizophrenia; kynurenic acid; nicotine; VTA; dopamine; NMDA-receptors;

    Abstract : Kynurenic acid is a metabolite of tryptophan and the only known naturally occurring NMethylD-Aspartic acid (NMDA)-receptor antagonist (at the co-agonist glycine site) in the human brain. The aim of the present work was to investigate the physiological and pharmacological significance of endogenous kynurenic acid as well as its putative pathophysiological implications. READ MORE

  6. 4. Mineral dissolution from molecular to field scale

    Author : Heléne Strandh; William H. Casey; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Mineralogy; Petrology and Geochemistry; mineralogi; petrologi och geokemi;

    Abstract : Mineral reactivity contributes to the global biogeochemical cycling of elements. CO2is consumed during the chemical weathering of many silicates and during formation of carbonates in the oceans. READ MORE

  7. 5. Bioactive Carbohydrates in Vining Peas (Pisum sativum) - Variation in alpha-galactoside content and the colonic fermentation of sugar alcohols

    Author : Jimmy Ekvall; Avdelningen för livsmedel och läkemedel; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; alpha-galactosides; raffinose family oligosaccharides; Näringslära; Nutrition; short-chain fatty acids; colonic fermentation; myo-inositol; sorbitol; xylitol; sugar alcohols; blanching; maturity; cultivar; Pisum sativum;

    Abstract : The composition of the colonic microflora is essential for the health of the human host. To be able to survive, the microflora is dependent of a continuous supply of substrate. In this respect dietary fibre and other indigestible carbohydrates, of which the consumption in affluent societies is generally low, are of great importance. READ MORE