Sökresultat

Popular Abstract in Swedish Undersökning av bihåleventilation med 133-xenon washout teknik och gammakamera med tomografi, gör det möjligt att mäta ventilationen även i de djupa bihålorna som bakre ethmoidalsinus och sphenoidalsinus. Mätningar visar reproducerbara resultat hos friska försökspersoner där normala variationer i näsandningsmotstånd och kroppsläge ej påverkar mätresultaten. BihåleventilA noninvasive 133-xenon washout technique was used to evaluate the ventilation of the paranasal sinuses in healthy subjects and in patients with sinus disease. A mixture of air and 133-xenon is insufflated into the nasal cavities and passage into the sinuses is facilitated by a pressure increase created by letting the subjects inflate a balloon. A scintillation camera allowing single photon emissi

Popular Abstract in Swedish Avhandlingen består av två delar, den första som behandlar konstruktionen av järn-pulver maskiner, och den andra med analys av ljud från el-maskiner. I Del I, en elektrisk magnetiserad klo-pol synkron maskin på 1.6 kW har byggts. Maskinen är byggt från mjuk magnetisk material (SMC), också kallad järn-pulver. Detta materialet har isotropiska magnetiska egenskaper, som gThis thesis consists of two parts, the first dealing with the design of iron-powder synchronous machines, and the second with the analysis and prediction of the acoustic noise in electrical machines. In Part I, a 1.6 kW electrically magnetized claw-pole machine with magnetically conducting end-plates has been analyzed and a prototype tested. The machine is built from soft magnetic composite mater

The thesis describes the neural precursor cell line RN33B transplanted subretinally to adult healthy and young dystrophic rat retina. The cell line is generated from E12,5 rat raphe nucleus and transduced with the temperature sensitive mutant of the Simian Virus 40 (SV40) large T-antigen. The transplanted cells can be detected by the reporter genes for beta-galactosidase (beta-Gal) and the green f

Laboratory experiments were conducted to examine the ability of several clay minerals from Sweden to remove the fish-killing microalga, Prymnesium parvum Carter, from suspension. In their commercial form (i.e. after incineration at 400degreesC), seawater slurries (salinity = 26) of the three minerals tested were generally ineffective at removing P. parvum from culture within a range of 0.01 to 0.5

Type 1 diabetes (T1D) is characterized by selective autoimmune destruction of the insulin producing beta-cells in the islets of Langerhans. When the beta-cells are destroyed exogenous administration of insulin is necessary for maintenance of glucose homeostasis. Allogeneic islet transplantation has been used as a means to circumvent the need for insulin administration and has in some cases been ab

The cGMP-dependent protein kinase (PKG) is the main mediator of nitric oxide-induced relaxation of smooth muscle. Although this pathway is well established, the cellular action of PKG, nitric oxide, and cGMP is complex and not fully understood. A cross-talk between the cGMP-PKG and other pathways (e.g. cAMP-protein kinase A) seems to exist. We have explored cGMP- and cAMP-dependent relaxation of s

Recombinant adeno-associated viral (rAAV) vector-induced neuropeptide Y (NPY) overexpression in the hippocampus exerts powerful antiepileptic and antiepileptogenic effects in rats. Such gene therapy approach could be a valuable alternative for developing new antiepileptic treatment strategies. Future clinical progress, however, requires more detailed evaluation of possible side effects of this tre

This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10h

Aim The northern limits of temperate broadleaved species in Fennoscanndia are controlled by their requirements for summer warmth for successful regeneration and growth as well as by the detrimental effects of winter cold on plant tissue. However, occurrences of meteorological conditions with detrimental effects on individual species are rare events rather than a reflection of average conditions. W

Introduction: The aim of this study was to investigate the role of hand bone mineral density (BMD) loss analyzed with digital X-ray radiogrammetry (DXR) in early rheumatoid arthritis (RA) as a predictor for progression of joint damage. Methods: In 379 patients with early RA, baseline and one-year hand BMD was measured with DXR and the hand bone loss (HBL) was analyzed using the smallest detectable

Popular Abstract in Swedish Spridning och inavel i naturen I modern tid har vi människor orsakat stora förändringar i miljön, vilket påverkat många arters livsbetingelser. Exempelvis har vi avskogat stora områden och efterlämnat små delar av de större områden som tidigare hängde ihop. Organismer som lever i sådana uppsplittrade miljöer kommer att vara isolerade från varandra, vilket får som följdTo evaluate how inbreeding affects the viability of small populations, it is crucial to determine what constitutes a population (i.e., the number of breeders in local patches and the degree of dispersal), and also to estimate the reproductive consequences of philopatry and emigration. In this thesis, I concentrate on dispersal, inbreeding and fitness in natural populations. I consider dispersal ra

We consider a distribution system consisting of a central warehouse and a group of retailers facing independent stochastic demand. The retailers replenish from the warehouse, and the warehouse from an outside supplier with ample supply. Time is continuous. Most previous studies on inventory control policies for this system have considered stock-based batch-ordering policies. We develop a time-base

Phthalates are ubiquitous industrial chemicals that have been associated with altered reproductive function in rodents. Several human studies have reported an inverse association between male testosterone and phthalate levels. Our aim was to investigate time to pregnancy (TTP) according to serum levels of diethylhexyl phthalate (DEHP) and diisononyl phthalate (DiNP) metabolites in both partners. I

The cerebellar cortex is necessary for adaptively timed conditioned responses (CRs) in eyeblink conditioning. During conditioning, Purkinje cells acquire pause responses or "Purkinje cell CRs" to the conditioned stimuli (CS), resulting in disinhibition of the cerebellar nuclei (CN), allowing them to activate motor nuclei that control eyeblinks. This disinhibition also causes inhibition of the infe

The Palaeocene arctic supported a vegetation type quite distinct from the tundra and polar desert of today. Here we demonstrate, through the palynological record, the structure of this extinct vegetation and its dynamics over this period. The Late Palaeocene coal-bearing units of the Sagwon Bluffs on Alaska's North Slope (present latitude 69 degrees N) are predominantly fine-grained, non-marine an

The article discusses the identity, roles, and duties of the professional historian in an era in which the historical dimension is no longer a historian's monopoly. It is argued that the standard modern framework of understanding a historian as someone highly specialized in the production of 'new' history has to give way to a new understanding that situates the historian in historical culture, whi

In a broad range of species-including humans-it has been demonstrated that telomere length declines throughout life and that it may be involved in cell and organismal senescence. This potential link to ageing and thus to fitness has triggered recent interest in understanding how variation in telomere length is inherited and maintained. However, previous studies suffer from two main drawbacks that

Background: Early developmental conditions can influence within- and among-brood variation in the timing of hatching/birth, which has been shown to affect offspring survival, growth, and reproductive success across a range of species. Problem: How does within- and among-litter variation in the timing of birth affect offspring growth and survival in Egernia whitii? Organism: Egernia whitii, a l

Abstract in Spanish A pesar de que el mercado laboral sueco ha permanecido relativamente intacto durante la crisis económica en los últimos seis años, la integración de personas con capacidad laboral reducida a causa de discapacidades es significativamente menor que la de otros grupos sociales. La legislación sueca sobre discapacidad y trabajo cubre varios aspectos en medidas de integración, antidEven though the Swedish labour market has been more or less intact during the financial crisis in the past six years, persons with reduced working capacity due to disabilities are significantly less integrated in the labour market than other groups in society. Swedish legislation on disability and work provides for a number of different aspects of integrative measures, anti-discrimination and prov