Sökning: "däggdjur"

Visar resultat 1 - 5 av 61 avhandlingar innehållade ordet däggdjur.

1. 1. The tempo and mode of evolution : a neontological reappraisal

   Författare :Melanie Monroe; Folmer Bokma; Pär Ingvarsson; Mikael Fortelius; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; birds; extinction; macroevolution; mammals; microevolution; punctuated equilibrium; speciation;

   Sammanfattning : The theory of “punctuated equilibrium” suggests that species evolve rapidly during or immediately upon speciation, “punctuating” long periods of little or no morphological evolution. Here I confirm that body size differences within clades of birds and mammals are best explained using a model of punctuated evolution. LÄS MER

3. 2. Marsupial Mitogenomics

   Författare :Maria Nilsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Genetics; Biologi; Biology; divergence times; K T-boundary; phylogenetic reconstruction; Ameridelphia; Australidelphia; Notoryctes; Dromiciops; Marsupialia; mitochondrial genomes; cytogenetics; Genetik; cytogenetik;

   Sammanfattning : The relationships of the mammalian infraclass Marsupialia have been investigated by phylogenetic analysis using completely sequenced mitochondrial genomes. The organisation and structure of the marsupial mitochondrial genomes deviates from the general mammalian structure. LÄS MER

4. 3. Phylogeny of Artiodactyla and Cetacea - based on mitochondrial genomes

   Författare :Björn M Ursing; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Genetics; mitochondrial genome; phylogeny; Artiodactyla; Cetacea; cytogenetics; Genetik; cytogenetik;

   Sammanfattning : Artiodactyla (eved-toed ungulates) and Cetacea (whales) are two mammalian orders that are commonly recognised as sistergroups. Recently it has been suggested that Cetacea originated within Artiodactyla, but the relationships among the different artiodactyl lineages and Cetacea have not been conclusively established. LÄS MER

5. 4. Mapping and annotating the mammalian body-wide protein-coding gene expression

   Författare :Max Karlsson; Mathias Uhlén; Linn Fagerberg; Julio Saez-Rodriguez; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein; protein-coding; genes; annotation; atlas; scRNA-Seq; RNA-Seq; transcriptomics; proteomics; Biotechnology; Bioteknologi;

   Sammanfattning : A central aim of fundamental research is to create conditions necessary for fueling further research and innovation. Our understanding of basic biology is central for future developments of tools for diagnosing, monitoring, and treating disease. LÄS MER

7. 5. Cardiovascular and respiratory effects of apnea in humans

   Författare :Johan Andersson; Funktionell zoologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lung volume; breath-hold diving; Apnea; breath-holding; face immersion; cold stimulation; diving response; diving reflex; circulation; bradycardia; vasoconstriction; arterial blood pressure; cardiac output; spleen; respiration; splenic contraction; alveol; Physiology; Fysiologi; Respiratory system; Andningsorganen; Animal physiology; Djurfysiologi;

   Sammanfattning : This thesis deals with cardiovascular and respiratory effects of apneas in humans. During apnea (breath-holding), a number of interacting cardiovascular reflexes are initiated, and together these reflexes are called the “diving response”. LÄS MER