Sökning: "brain evolution"

Visar resultat 11 - 15 av 78 avhandlingar innehållade orden brain evolution.

  1. 11. Evolution of the Neuropeptide Y System in Vertebrates with Focus on Fishes

    Författare :Tomas Larsson; Dan Larhammar; Svante Winberg; Kenneth H. Wolfe; Uppsala universitet; []
    Nyckelord :Molecular biology; neuropeptide Y; GPCR; evolution; gene duplication; vertebrates; ray-finned fishes; Molekylärbiologi;

    Sammanfattning : Gene families in vertebrates often contain more dulicates (paralogs) than in invertebrates. This has been attributed to genome duplications, i.e., tetraploidizations. LÄS MER

  3. 12. Expression of TGF- isoforms, their receptors and related SMAD proteins in brain pathology : Immunohistochemical studies focusing on infarcts, abscesses and malignant gliomas

    Författare :Ahmad Khaled Ata; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Genetics; TGF-beta receptor; SMAD; brain; infarct; abscess; glioma; experimental; human; Genetik; Clinical genetics; Klinisk genetik; Genetics; genetik;

    Sammanfattning : This thesis focuses on the immunohistochemical expression of transforming growth factor beta(TGFβ) isoforms, their receptors and TGF-β-related SMAD proteins in brain pathology, chiefly in-farcts. One key question was whether the expressions of these compounds are altered within glial cells, endothelial cells of microvessels and other cell types in the vicinity of infarcts. LÄS MER

  4. 13. Sexually Dimorphic Gene Expression in the Mammalian Brain

    Författare :Björn Reinius; Elena Jazin; Klas Kullander; Arthur Arnold; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Utvecklingsbiologi;

    Sammanfattning : In recent times, major advances have been made towards understanding sexual dimorphism in the brain on a molecular basis. This thesis summarises my modest contributions to these endeavours. Sexual dimorphisms are manifested throughout the spectrum of biological complexity, and can be studied by numerous approaches. LÄS MER

  5. 14. The link between brain size, cognitive ability, mate choice and sexual behaviour in the guppy (Poecilia reticulata)

    Författare :Alberto Corral López; Niclas Kolm; Janette Boughman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sexual selection; artificial selection; brain evolution; optomotor test; decision-making; discrimination; assessment; optimal decisions; rational choice; behavioural flexibility; expensive tissue; predation; sex ratio; OSR; maintenance of variation; etologi; Ethology;

    Sammanfattning : Competition over access for mates has led to the evolution of many striking examples of morphological traits and behaviour in animals. The rapid development of the sexual selection field in recent decades have dramatically advanced our understanding of what traits make individuals more successful in attracting mates and how preferences for mates evolve over time. LÄS MER

  7. 15. Mind in Motion: The utilization of noise in the cognitive process

    Författare :Robert Pallbo; Data Vetenskap; []
    Nyckelord :HUMANIORA; HUMANITIES; AI; image processing; spontaneous activity; motion detection; knowledge acquisition; homunculus; evolutionary epistemology; evolution; cognition; noise; neural networks; Psychology; Psykologi;

    Sammanfattning : The brain is not silent. Even in the absence of stimuli are the neurons activated every now and then in what is called "spontaneous" or "background activity" which provides a noisy background to the operation of the brain. This work shows how this noise can be utilized in the cognitive process. LÄS MER