Sökning: "nutrient-limitations"

Hittade 5 avhandlingar innehållade ordet nutrient-limitations.

  1. 1. Organic acids in root exudates and soil solutions. Importance to calcicole and calcifuge behaviour of plants

    Författare :Lena Ström; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nutrient-solubilisation; iron; phosphate; nutrient-limitations; citrate; oxalate; organic acids; root exudation; acidifuge; Calcicole; calcifuge; adaptations.; Plant ecology; Växtekologi;

    Sammanfattning : Many vascular plant species are unable to colonise calcareous sites, the floristic composition of adjacent limestone and acid silicate soils differing markedly. The inability of these 'calcifuge' species to establish themselves and grow on limestone soil appears to mainly be related to their low capacity for solubilising and absorbing phosphate and/or iron from such soils. LÄS MER

  3. 2. Adapting to succeed : Post-transcriptional gene regulation in Salmonella

    Författare :Alisa Rizvanovic; Erik Holmqvist; Fabien Darfeuille; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Salmonella; gene regulation; post-transcriptional regulation; RNA-binding protein; ProQ; sRNA; flagella; motility; antibiotic persistence;

    Sammanfattning : Salmonella are zoonotic pathogens of worldwide economic and health importance. Both during life outside and inside the host, these pathogens are subject to continuously changing environmental conditions, such as temperature changes, acid stress, nutrient limitations, and others. LÄS MER

  4. 3. Impact of nitrogen deposition on carbon stocks in coniferous forest soils : insights from experiments with low and high nitrogen addition rates

    Författare :Benjamin Forsmark; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES;

    Sammanfattning : Nutrient limitations constrain the capacity for northern coniferous forests to capture and store carbon (C). Nitrogen (N) deposition may enhance tree productivity in these forests, but it remains uncertain how the storage of C in soils is responding to changes in N availability, and how limitations by other elements, such as phosphorus (P), develop in response to N enrichment. LÄS MER

  5. 4. Ethanol production from lignocellulose using high local cell density yeast cultures. Investigations of flocculating and encapsulated Saccharomyces cerevisiae

    Författare :Johan Westman; Högskolan i Borås; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; yeast; encapsulation; lignocellulose; ethanol; fermentation; flocculation; inhibitors; tolerance; xylose; co-utilisation; Resource Recovery; Resursåtervinning; Resource Recovery; Yeast;

    Sammanfattning : Efforts are made to change from 1st to 2nd generation bioethanol production, using lignocellulosics as raw materials rather than using raw materials that alternatively can be used as food sources. An issue with lignocellulosics is that a harsh pretreatment step is required in the process of converting them into fermentable sugars. LÄS MER

  7. 5. Physical control of primary production in a sub-arctic reservoir

    Författare :Jörgen Sahlberg; Lars Rahm; Linköpings universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The first paper (Paper I) in this thesis treats autumn cooling in the Swedish lake Väsman. The water temperature is simulated using a one-dimensional lake model where the vertical mixing is calculated by a k - ɛ turbulence model. The heat exchange between the atmosphere and the lake is formulated in terms of heat fluxes. LÄS MER