Sökning: "Per Johanson"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Per Johanson.

1. 1. Improvements in hip arthroplasty - did they work? Evaluations of different articulations and fixation concepts

   Författare :Per-Erik Johanson; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; hip arthroplasty; innovation; outcome;

   Sammanfattning : Today, total hip arthroplasty (THA) is one of the safest and most efficient surgical treatments. New materials, surgical techniques and design concepts intended to improve THA have not always been successful. LÄS MER

3. 2. On the dynamic ST-segment during acute myocardial infarction

   Författare :Per Johanson; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; acute myocardial infarction; ST-monitoring; prognosis; angiography;

   Sammanfattning : Acute myocardial infarction is the single most common cause of death for both men and women in Sweden. Great efforts have over the years successfully been made to improve immediate treatment and care, and thereby prognosis. However, inadequacies in use of new knowledge and technology have been reported in this field. LÄS MER

4. 3. What if your world is outside the oyster? : How highly educated and skilled first-generation immigrant entrepreneurs develop opportunities in knowledge-intensive sectors

   Författare :Reema Akhtar; Maria Frostling; Martin Johanson; Per Servais; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; first-generation immigrant entrepreneurs; highly educated and skilled immigrants; opportunity development; recognition of business idea; evaluation of business idea; weak social ties; strong social ties; prior work experience; education; Business Administration; företagsekonomi;

   Sammanfattning : In the previous decades, immigration has increased significantly from non-EU countries to Western countries including Sweden. Due to different backgrounds, immigrant´s economic integration is even more important for their financial support and the economic growth of the host country. LÄS MER

5. 4. The Origin of Tooth Replacement : Three-dimensional Synchrotron Histology Visualizes the Dental Development of Silurian Stem Osteichthyans

   Författare :Donglei Chen; Per Ahlberg; Zerina Johanson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Mechanisms of tooth replacement distribute incongruently among extant gnathostomes (jawed vertebrates): a permanent tooth-generating dental lamina exists in chondrichthyans (cartilaginous fish) and tetrapods but not teleosts, whereas tooth shedding by basal hard tissue resorption occurs in tetrapods and teleosts but not chondrichthyans. Theories about the evolution of tooth development have been biased towards the chondrichthyan conveyor-belt replacement, since there has been no fossil evidence for the origin of osteichthyan (bony fish and tetrapods) tooth replacement until now. LÄS MER

7. 5. Morphology, Taxonomy and Interrelationships of Tristichopterid Fishes (Sarcopterygii, Tetrapodomorpha)

   Författare :Daniel Snitting; Per Erik Ahlberg; Graham Budd; Henning Blom; Zerina Johanson; Uppsala universitet; []
   Nyckelord :Organismic biology; Sarcopterygii; Tetrapodomorpha; Tristichopteridae; biogeography; phylogeny; Computed Tomography; Devonian; Organismbiologi;

   Sammanfattning : Tristichopterids (Sarcopterygii, Tetrapodomorpha) form a monophyletic group of exclusively Devonian fishes. This thesis consists of descriptions of new material of tristichopterids and closely related taxa, as well as new interpretations and descriptions of previously figured material. LÄS MER