Sökning: "fitness components"

Visar resultat 1 - 5 av 50 avhandlingar innehållade orden fitness components.

  1. 1. Experimental Evolution : and Fitness Effects of Mutations

    Författare :Anna Knöppel; Dan I Andersson; Stanley Maloy; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Experimental evolution; Fitness effects; mutations; S20; fis; ribosome; horizontal gene transfer; adaptation; synonymous mutations; Mikrobiologi; Microbiology;

    Sammanfattning : Bacteria have small, streamlined genomes and evolve rapidly. Their large population sizes allow selection to be the main driver of evolution. With advances in sequencing technologies and precise methods for genetic engineering, many bacteria are excellent models for studying elementary questions in evolutionary biology. LÄS MER

  2. 2. Bacterial Resistance to Antimicrobial Peptides : Rates, Mechanisms and Fitness Effects

    Författare :Maria Pränting; Dan Andersson; Ian Chopra; Uppsala universitet; []
    Nyckelord :antimicrobial peptides; antibiotic resistance; fitness cost; bacterial evolution; small colony variants; cyclotides; Biologi med inriktning mot mikrobiologi; Biology with specialization in Microbiology; Mikrobiologi; Microbiology;

    Sammanfattning : The rapid emergence of bacterial resistance to antibiotics has necessitated the development of alternative treatment strategies. Antimicrobial peptides (AMPs) are important immune system components that kill microbes rapidly and have broad activity-spectra, making them promising leads for new pharmaceuticals. LÄS MER

  3. 3. Physical Fitness in Hospitalized Frail Elderly Patients

    Författare :Kristina Åhlund; Maria Bäck; Niklas Ekerstad; Birgitta Öberg; Lars Nyberg; Linköpings universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICAL AND HEALTH SCIENCES; Physical fitness; frailty; in-hospital care; comprehensive geriatric assessment;

    Sammanfattning : Demographic research shows that the proportion of older people in society is increasing. More people age well, but there are also more people getting old with disability and multimorbidity. The large diversity in functioning illustrates the heterogeneity of aging. LÄS MER

  4. 4. Mating behaviour in Drosophila melanogaster and its implication to genetic variation

    Författare :Sven-Eric Åslund; Umeå universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; drosophila melanogaster; mating behaviour; fitness; allozymes; bristles; Y chromosome; polymorphism; selection;

    Sammanfattning : Not much is known about the mechanisms affecting the genetic composition of populations of different species. To investi­gate one of these potential mechanisms, mating behaviour, the fruit fly Drosophila melanogaster, was chosen as an experimen­tal animal. LÄS MER

  5. 5. Frequency changes and equilibria in experimental populations of Drosophila melanogaster with three lethal carrying fourth chromosomes

    Författare :Agneta Södergren; Umeå universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Drosophila melanogaster; cage populations; fourth chromosome lethals; fitness components; equilibrium conditions; selective values;

    Sammanfattning : Populations where three different lethals are segregating as alleles have been analysed for the conditions of equilibrium and for the trends during elimination of one allele. Early and late selection as well as sexdependent and sexindependent selection has been taken into consideration. LÄS MER