Sökning: "Evolution"

Visar resultat 1 - 5 av 2455 avhandlingar innehållade ordet Evolution.

  1. 1. Biased Evolution Causes and Consequences

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Gerrit Brandis; Uppsala universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Evolution; Codon usage bias; Post-transcriptional regulation; Recombination; Inversion; EF-Tu; Frameshift suppression; Antibiotic resistance; Rifampicin; Ciprofloxacin; Compensatory evolution; Drug efflux; RNA polymerase; DNA gyrase; Mikrobiologi; Microbiology;

    Sammanfattning : In evolution alternative genetic trajectories can potentially lead to similar phenotypic outcomes. However, certain trajectories are preferred over others. These preferences bias the genomes of living organisms and the underlying processes can be observed in ongoing evolution. LÄS MER

  3. 2. Mitochondrial Evolution Turning Bugs into Features

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Olof Karlberg; Uppsala universitet.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; Biologi; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Sammanfattning : The bacterial origin of mitochondria from an ancient endosymbiosis is now widely accepted and the mitochondrial ancestor is generally believed to belong to the bacterial subdivision α-proteobacteria. The high fraction of mitochondrial proteins encoded in the nucleus has commonly been explained with a massive transfer of genes from the genome of the ancestral mitochondrion. LÄS MER

  4. 3. Encountering Evolution Children's Meaning-Making Processes in Collaborative Interactions

    Detta är en avhandling från Linköping : Linköping University Electronic Press

    Författare :Johanna Frejd; Linköpings universitet.; Linköpings universitet.; [2019]
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Meaning-making processes; Science Education; Evolution; Multimodality; Collaborative Interaction; Exploratory studies; Meningsskapandeprocesser; Naturvetenskapsundervisning; Evolution; Multimodalitet; Interaktion; Explorativa studier;

    Sammanfattning : This thesis explores preschool class children’s meaning making processes when they encounter evolution. By adopting social semiotic and sociocultural perspectives on meaning making, three group-based tasks were designed. Video data from the activities were analysed using a multimodal approach. LÄS MER

  5. 4. Modelling Evolution From non-life, to life, to a variety of life

    Detta är en avhandling från Uppsala : Department of Mathematics

    Författare :Yu Liu; Uppsala universitet.; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Mathematical biology; Biocomplexity; Artificial chemistry; Ecosystem evolution; Origin of life; Self-replication; Prebiotic evolution; Collectively-catalytic; Golden ratio; Tillämpad matematik och statistik; Applied Mathematics and Statistics;

    Sammanfattning : Life is able to replicate itself, e.g., a microorganism is able to divide into two identical ones, and a single plant is able to forest a whole island. LÄS MER

  7. 5. Experimental Evolution and Fitness Effects of Mutations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Anna Knöppel; Uppsala universitet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; 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