Sökning: "diatoms"
Visar resultat 11 - 15 av 85 avhandlingar innehållade ordet diatoms.
11. Silicon cycling in the Baltic Sea : Trends and budget of dissolved silica
Sammanfattning : The dissolved silicon (DSi) has a crucial role for growth of a large group of primary producers – diatoms and, hence, impact on functioning of the aquatic food web. This thesis contributes to an increased understanding of the modifications of the DSi cycling in the Baltic Sea. LÄS MER
12. Survivors of the Sea: Investigating the genomics and survival strategies of the diatom Skeletonema marinoi
Sammanfattning : Diatoms are an ecologically important group of phytoplankton, responsible for around 20% of global primary production. One of the features contributing to their success is their ability to form resting stages, a response to adverse conditions in which they enter a dormant state and sink to the sediment. LÄS MER
13. Benthic use of phytoplankton blooms: uptake, burial and biodiversity effects in a species-poor system
Sammanfattning : Animals living in marine sediments (the second largest habitat on earth) play a major role in global biogeochemical cycling. By feeding on organic matter from settled phytoplankton blooms they produce food for higher trophic levels and nutrients that can fuel primary production. LÄS MER
14. Late Quaternary climate and environmental change in the summer rainfall region of South Africa : A study using trees and wetland peat cores as natural archives
Sammanfattning : This thesis contributes with information on past climate and environmental changes in South Africa’s summer rainfall region. The study is based on multi-proxy analyses on wetland peat cores and analyses of stable isotope composition (δ13C, δ18O) and wood anatomy in cross sections from subtropical trees (Breonadia salicina). LÄS MER
15. Mass Spectrometry of Non-protein Amino Acids : BMAA and Neurodegenerative Diseases
Sammanfattning : Neurodegenerative diseases have been shown to correlate positively with an ageing population. The most common neurodegenerative diseases are amyotrophic lateral sclerosis (ALS), Parkinson’s disease and Alzheimer’s disease. LÄS MER