Sökning: "Mallards"

Visar resultat 1 - 5 av 20 avhandlingar innehållade ordet Mallards.

1. 1. Resistance to neuraminidase inhibitors in influenza A virus isolated from mallards

   Författare :Goran Orozovic; Björn Olsen; Johan Lennerstrand; Sigvard Olofsson; Linnéuniversitetet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; influenza; mallards; neuraminidase; PCR; sequencing; mutation; oseltamivir; zanamivir; resistance; NAI; antivirals; pandemic; Virology; Virologi; Molecular biology; Molekylärbiologi; Bioinformatics; Bioinformatik; Zoonotisk ekologi; Zoonotic Ecology; Virology; Virologi; Biokemi; Biochemistry;

   Sammanfattning : Influenza A virus belongs to the Orothomyxoviridae family of viruses and is one of the most common pathogens that cause infections of the respiratory tract. The aim of this thesis was to investigate if neuraminidase inhibitor (NAI) Tamiflu® (oseltamivir, OC) and Relenza® (zanamivir, ZA) - related resistance mutations exist in the neuraminidase (NA) gene of viruses collected from wild birds. LÄS MER

3. 2. Stopover Ecology of Mallards : Where, when and how to do what?

   Författare :Daniel Bengtsson; Jonas Waldenström; W. Michael Eichholtz; Linnéuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Age characters; body condition; departure decision; effects of influenza A virus; habitat selection; mallard; movement; Ottenby Bird Observatory; stopover ecology; weather; wild birds; Ecology; Ekologi;

   Sammanfattning : The mallard (Anas platyrhynchos) is the most numerous and widespread duck in the northern hemisphere and a model species in ecology and harvest management. Migration is a crucial life stage for many birds and understanding the drivers of migration has important implications for conservation biology and assessment of animal population responses to global changes. LÄS MER

4. 3. Perspectives on urban wastewater as a source of microbial pollution

   Författare :Stina-Mina Ehn Börjesson; Ann-Sofi Rehnstam-Holm; Betty Collin; Högskolan Kristianstad; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Wastewater; Mallards; Anas platyrhynchos; E. faecium; E. faecalis; Campylobacter jejuni; Vibrio parahaemolyticus;

   Sammanfattning : Wastewater treatment plants are important links for dissemination of intestinal bacteria into surface waters. In this study, twelve mallards were exposed to treated wastewater for a period of 55 days. Faecal samples were collected and analysed for Enterococcus spp. and C. LÄS MER

5. 4. Perspectives on urban wastewater as a source of microbial pollution

   Författare :Stina-Mina Ehn Börjesson; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Wastewater; Mallards; Anas platyrhynchos; E. faecium; E. faecalis; Campylobacter jejuni; Vibrio parahaemolyticus;

   Sammanfattning : Wastewater treatment plants are important links for dissemination of intestinal bacteria into surface waters. In this study, twelve mallards were exposed to treated wastewater for a period of 55 days. Faecal samples were collected and analysed for Enterococcus spp. and C. LÄS MER

7. 5. Parental and embryonic behaviours in precocial birds

   Författare :Irene Persson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; pheasants; growth rate; oxygen consumption; hatch synchronization; incubation behaviour; nest predation; physical condition; Egg laying; primary sex ratio; mallards; Animal ecology; Djurekologi;

   Sammanfattning : This thesis deals with behaviours during reproduction in precocial birds, both from the perspective of the female and of the embryos. Female pheasants in good physical condition laid larger eggs and produced a higher proportion of daughters than females in poor condition. LÄS MER