Sökning: "season"

Visar resultat 16 - 20 av 532 avhandlingar innehållade ordet season.

1. 16. Transport of Arsenic and Heavy Metals to Lake Poopó - Bolivia Natural Leakage and Anthropogenic Effects

   Författare :Maria Garcia Moreno; Avdelningen för Teknisk vattenresurslära; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hydrogeology; Naturvetenskap; Natural science; Miljöstudier; Environmental studies; Poopó Lake; heavy metals; Bolivia; geographical and geological engineering; Hydrogeologi; teknisk geologi; teknisk geografi;

   Sammanfattning : Bolivia, a country located in the center of South America, has in the west part an Andean region, where the Poopó Lake is located. The area has many mineral resources, and thus since thousands of years,mining activity has had a large importance; however, mainly since colonial times, the extraction of these resources has been indiscriminate and the region of the Poopó Lake, has suffered the consequences of environmental contamination. LÄS MER

3. 17. Towards a changed view on greenhouse gas exchange in the Arctic: new findings and improved techniques

   Författare :Mikhail Mastepanov; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; methane; carbon dioxide; greenhouse gas; chamber; Arctic; fen; permafrost;

   Sammanfattning : Arctic ecosystems represent an important component in the global terrestrial exchange of greenhouse gases and energy with the atmosphere. In the changing climate, which is most pronounced in the Arctic, the possible scenarios of greenhouse gas exchange response should be seriously considered in predictive climate modelling efforts. LÄS MER

4. 18. Factors Influencing Evolution to Antimalarial Drug Resistance in Plasmodium falciparum in Sudan and The Gambia

   Författare :Amany Kheir; Göte Swedberg; Susanne Kerje; Hamza Babiker; Staffan Svärd; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; cross-mating; fitness; microsatellite haplotypes; mosquito infectivity; Infectious diseases; Infektionssjukdomar; Molekylär genetik; Molecular Genetics;

   Sammanfattning : Drug resistance is a major obstacle to management and control of malaria and currently progressing at a rapid rate across Africa. This thesis has examined factors influencing evolution of resistant P. falciparum at two sites in Africa, including parasite migration, cross mating and fitness cost of resistance. LÄS MER

5. 19. The oxidative metabolism by eosinophils : Effects of allergen exposure and interleukin-5

   Författare :Charlotte Woschnagg; Uppsala universitet; []
   Nyckelord :Medical sciences; Eosinophils; allergy; asthma; rhinitis; oxidative metabolism; IL-5; priming; signal transduction; protein phosphorylation; MEDICIN OCH VÅRD; MEDICINE; MEDICIN; Clinical Chemistry; klinisk kemi;

   Sammanfattning : In this thesis the oxidative metabolism by blood eosinophils from birch pollen allergic subjects was studied and compared to that by eosinophils from healthy controls, during and out of the pollen season. The effects and mechanisms of in vitro IL-5 priming on blood eosinophils were investigated and compared to the effects of in vivo priming during pollen exposure. LÄS MER

7. 20. Distribution and fate of polychlorinated biphenyls within the pelagic microbial food web

   Författare :Petra Wallberg; Per Larsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; zoologi; Zoology;

   Sammanfattning : The composition and production of the plankton community in aquatic environments will in turn influence the food-web structure of larger predators, nutrient cycling, the sinking flux and, hence, the fate of hydrophobic organic contaminants. The aim of the research presented here was to study the distribution and fate of PCBs within the microbial food web, including bacteria, flagellates, ciliates, and phytoplankton. LÄS MER