Sökning: "Compensatory evolution"

Visar resultat 16 - 20 av 24 avhandlingar innehållade orden Compensatory evolution.

  1. 16. The biological cost of resistance to antibiotics

    Författare :Johanna Björkman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cell and molecular biology; Cell- och molekylärbiologi; Cell and molecular biology; Cell- och molekylärbiologi; mikrobiologi; Microbiology;

    Sammanfattning : The rate of development and stability of antibiotic resistance are determined by several factors including (i) the mutation rate, (ii) the fitness costs of resistance, and (iii) the ability of bacteria to genetically compensate for such costs.. This study has focused on the experimental measurement of these parameters in antibiotic-resistant S. LÄS MER

  3. 17. Adaptation and plasticity within and across generations

    Författare :Zuzana Sekajova; Martin Lind; Lesley Lancaster; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Phenotypic plasticity; nongenetic inheritance; environmental variation; Caenorhabditis elegans; Caenorhabditis remanei; life history; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : The environment is seldom stable but often changes from one state to another and in order to survive and reproduce organisms need to respond to those changes. If the change is fast, genetic adaptations may not evolve quickly enough and organisms must adopt other strategies, such as phenotypic plasticity. LÄS MER

  4. 18. Growth in Aging Colonies : The Importance of Being Different

    Författare :Marie Wrande; Diarmaid Hughes; Måns Ehrenberg; Mikael Rhen; Uppsala universitet; []
    Nyckelord :;

    Sammanfattning : The accumulation of rifampicin resistant (RifR) mutants in aging bacterial colonies has previously been attributed to stress-induced mutagenesis. Mutations giving rise to RifR are located in the rpoB gene, coding for the β subunit of RNA polymerase, RpoB. LÄS MER

  5. 19. Intracranial Pressure in Traumatic Brain Injury

    Författare :Sima Shahsavari; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Brain Swelling; Cerebral Autoregulation; Secondary Brain Injury; Traumatic Brain Injury; Cerebral Compliance; Intracranial Dynamics; Intracranial Pressure;

    Sammanfattning : Traumatic Brain Injury (TBI) continues to be a major problem worldwide. Today, intensive care of patients with TBI is mainely focused on preventing and treating secondary brain injuries. High pressure inside the intracranial cavity (ICP) has been found to be an important feature of disturbed cerebral dynamics and secondary injuries. LÄS MER

  7. 20. Causes and consequences of individual variation in anti-predator traits

    Författare :Kaj Hulthén; Enhet akvatisk ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal migration; partial migration; individual differences; predator; personality trait; phenotypic plasticity; inducible defence; mortality risk;

    Sammanfattning : Predation imposes a potent evolutionary force on prey, moulding the evolution of traits and diversification of species, and can furthermore have powerful ecological consequences. We know that different species vary in how they cope with their natural enemies, and, consequently, a huge range of anti-predator defences are displayed in nature. LÄS MER