Sökning: "sperm re"

Hittade 5 avhandlingar innehållade orden sperm re.

  1. 1. Sperm Whales : Social Organization and Global Genetic Structure

    Författare :Thomas Lyrholm; Mark Stoneking; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zoologi; Zoology;

    Sammanfattning : The social organization of most mammals is characterised by female philopatry and male dispersal. This thesis examines the social organization of sperm whales, Physeter macrocephalus, using a combination of field observations and molecular genetic techniques. LÄS MER

  3. 2. Pre- and post-copulatory sexual selection in the fowl, Gallus gallus

    Författare :Hanne Løvlie; Sven Jakobsson; Tommaso Pizzari; Matthew J. G. Gage; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cryptic female choice; Gallus; inbreeding avoidance; mate choice; sexual conflict; sexual selection; sperm competition; Ethology and behavioural ecology; Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The evolutionary goal of individuals is reproduction and sexual selection favours traits improving reproductive success. When males invest less than females in offspring, males have potentially a higher reproductive rate than females. LÄS MER

  4. 3. Pyralid moth reproduction: Communication, Constraints & Control

    Författare :Camilla Ryne; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; plant parasitology; Entomology; växtparasitologi; Entomologi; Animal ecology; Djurekologi; Chemistry; Kemi;

    Sammanfattning : Olfactory cues play an important role in the reproduction of three pyralid moths, the Indian meal moth (Plodia interpunctella), the Mediterranean flour moth (Ephestia kuehniella) and the almond moth (E. cautella). Both males and females of P. interpunctella are capable of multiple matings. LÄS MER

  5. 4. Studies of molecular mechanisms of telomere maintenance in Naumovozyma castellii

    Författare :Ahu Karademir Andersson; Molekylär cellbiologi; []
    Nyckelord :YEAST; Saccharomyces castellii; Naumovozyma castellii; Processvity; Telomerase; Telomere; ALT; Strain engineering;

    Sammanfattning : Telomeres are special DNA-protein structures that protect ends of chromosomes from being recognized as double-strand breaks. Telomeres consist of tandemly repeated units of TG-rich DNA and associate with telomere-specific proteins. LÄS MER

  7. 5. Fertility and HIV infection : fertility decision-making challenges of mutually- disclosed discordant couples and young people

    Författare :Jolly Beyeza-Kashesya; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Young people; HIV-infected; HIV discordant couples; Fertility decision-making; Uganda;

    Sammanfattning : Background: Sexuality and reproduction in mature generalised HIV epidemics pose significant dilemma to both HIV infected and negative people. Sexually active young people and HIV serodiscordant couples are faced with difficult decision-making about procreation and HIV transmission. LÄS MER