Sökning: "jan ekman"

Visar resultat 1 - 5 av 18 avhandlingar innehållade orden jan ekman.

  1. 1. Reading bones : Stone Age hunters and seals in the Baltic

    Författare :Jan Storå; Jan Ekman; Stockholms universitet; []
    Nyckelord :Epiphyseal fusion; Harp seal; Marine mammals; Neolithic; Pitted Ware culture; Ringed seal; Seal hunting; Seasonality; Taphonomy; arkeologi; Archaeology;

    Sammanfattning : This is a study of hunters and seals in the Stone Age in the Baltic. The ambition has been to develop and utilize methods for osteological analyses of archaeological seal bones. The main aims of the zooarchaeological analyses have been to study seal hunting strategies and the formation processes of the faunal remains. LÄS MER

  3. 2. Neolithic Fisheries : Osteoarchaeology of Fish Remains in the Baltic Sea Region

    Författare :Carina Olson; Jan Storå; Karin LImburg; Jan Ekman; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; Neolithic fisheries; local and regional ecosystems; species variation; burnt and unburnt bones; representativeness; contextual quantification; fishing technology; spatial patterns; Archaeology subjects; Arkeologiämnen; osteoarkeologi; Osteoarchaeology;

    Sammanfattning : The variety of fish species found at the archaeological sites indicates the exploitation of local and regional ecosystems. The focus of the fisheries varies from site to site. LÄS MER

  4. 3. Vascular endothelial growth factor in renal cell carcinoma

    Författare :Jan Jacobsen; Börje Ljungberg; Kjell Grankvist; Torgny Rasmuson; Anders Bergh; Peter Ekman; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; VEGF; isoforms; quantitative RT-PCR; immunohistochemistry; tissue microarray; Western blot; stage; survival; renal cell carcinoma; Urology and andrology; Urologi och andrologi;

    Sammanfattning : Background. Angiogenesis is essential for tumour growth. Vascular endothelial growth factor (VEGF) and its isoforms were investigated in relation to the clinical course in a large number of patients with renal cell carcinoma (RCC). Methods. LÄS MER

  5. 4. Cooperative Breeding in the Southern Anteater-Chat : Sexual Disparity, Survival and Dispersal

    Författare :Jonathan Barnaby; Jan Ekman; Anssi Laurila; Rita Covas; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Southern anteater-chat; Myrmecocichla formicivora; cooperative breeding; social evolution; behavioural ecology; delayed dispersal; family living; Africa; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Sammanfattning : Group-living sets the scene for complex social behaviours such as cooperative breeding, and exploring the factors that shape group-living is crucial in understanding these behaviours. This thesis explores the ecology of a population of the facultative cooperative breeding southern anteater-chat (Myrmecocichla formicivora), a group-living bird species endemic to southern Africa. LÄS MER

  7. 5. The Nepotistic Parent; Predator Protection, Kinship and Philopatry

    Författare :Michael Griesser; Jan Ekman; Ronald Mumme; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; referential alarm calls; delayed dispersal; nepotism; vigilance; alarm calling; mobbing; extended parental care; families; Perisoreus infaustus; Siberian jay; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Sammanfattning : Evolution is fuelled by independent reproduction events. Yet, the offspring of at least three percent of all bird species postpone dispersal and forego independent reproduction. LÄS MER