| 1. |
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| 2. |
- Kahnberg, Karl-Erik, 1941, et al.
(författare)
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Clinical evaluation of the zygoma implant : 3-year follow-up at 16 clinics
- 2007
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Ingår i: Journal of oral and maxillofacial surgery (Print). - : Elsevier BV. - 0278-2391 .- 1531-5053. ; 65:10, s. 2033-2038
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: The purpose of this clinical investigation was to evaluate the treatment outcome with zygoma implants with regard to implant survival, patient satisfaction, and function of prosthesis replacement after 3 years. Patients and Methods: The treatment outcome of 76 patients treated with 145 zygoma fixtures at 16 centers was evaluated with regard to implant survival. Status of peri-implant mucosa and amount of plaque were registered annually. Patients' and dentists' evaluations of the functional and esthetic outcome of the treatment were assessed at delivery of prosthesis and thereafter at each follow-up visit. Results: Sixty of 76 patients were followed for 3 years after prosthetic delivery. Five of 145 placed zygoma implants failed during the course of the study resulting in an overall implant survival rate of 96.3%. At the 3-year follow-up, 75% of the implants sites were registered with normal peri-implant mucosa and 68% with no visible plaque. The patients were fully satisfied with the esthetic and functional outcome of the treatment in 86% and 71%, respectively, at the 3-year follow-up visit. All reported data from dentists scored from acceptable to excellent. Conclusion: The multicenter study showed a high predictability of the zygoma implant-supported rehabilitation.
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| 3. |
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| 4. |
- Almgren, Sara, 1979, et al.
(författare)
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Gamma radiation doses to people living in Western Sweden.
- 2008
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Ingår i: Journal of environmental radioactivity. - : Elsevier BV. - 0265-931X. ; 99:2, s. 394-403
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Tidskriftsartikel (refereegranskat)abstract
- Indoor environments contribute to gamma radiation in the general population. The aims of the present study were to investigate average gamma radiation doses in a rural and an urban area of Sweden, compare indoor dose rates with personal exposure, and study the effects of building characteristics on radiation levels. Radiation was measured with thermoluminescence dosimeters (TLDs). Repeated measurements were performed with TLDs worn by participants (n=46) and placed in their dwellings. Personal dose rates were 0.092microSv/h (rural) and 0.096microSv/h (urban). The mean effective gamma dose rates in dwellings were 0.091microSv/h (rural) and 0.11microSv/h (urban), which are higher than the world average. Dose rates in apartments were higher than in detached houses and higher for concrete than wooden dwellings. Personal dose rates were strongly associated with dwelling dose rates (r(p)=0.68, p<0.01) and could be modelled. Within-participant variability was low.
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| 5. |
- Almgren, Sara, 1979, et al.
(författare)
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Measurements and comparisons of gamma radiation doses in a high and a low (137)Cs deposition area in Sweden.
- 2008
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Ingår i: Journal of environmental radioactivity. - : Elsevier BV. - 0265-931X. ; 99:11, s. 1750-5
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Tidskriftsartikel (refereegranskat)abstract
- Sweden is one of the countries affected by the Chernobyl fallout. The aim of the present study was to investigate the average radiation dose to people living in a high-deposition area (the parish of Hille) in Sweden for comparison with dose rates previously measured in a low-deposition area in western Sweden. Individual measurements (personal and dwelling dose rates) were performed using thermoluminescence dosimeters in 24 randomly chosen individuals. Dwelling and personal dose rates in Hille were 0.12 and 0.11 microSv/h, respectively. The dose rates in Hille were slightly higher than in western Sweden (difference for detached houses=0.024 microSv/h for personal and 0.030 microSv/h for dwelling dose rates), partly because of the higher (137)Cs deposition. In wooden houses, the difference was somewhat greater. Our results indicate a current contribution to personal gamma radiation in this area of about 0.2 mSv per year from the Chernobyl fallout.
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| 6. |
- Alsiö, Johan, et al.
(författare)
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Impact of nandrolone decanoate on gene expression in endocrine systems related to the adverse effects of anabolic androgenic steroids
- 2009
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Ingår i: Basic & Clinical Pharmacology & Toxicology. - : Wiley. - 1742-7835 .- 1742-7843. ; 105:5, s. 307-314
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Tidskriftsartikel (refereegranskat)abstract
- Elite athletes, body builders and adolescents misuse anabolic-androgenic steroids (AAS) in order to increase muscle mass or to enhance physical endurance and braveness. The high doses misused are associated with numerous adverse effects. The purpose of this study was to evaluate the impact of chronic supratherapeutic AAS treatment on circulating hormones and gene expression in peripheral tissues related to such adverse effects. Quantitative real-time PCR was used to measure expression levels of in total 37 genes (including peptide hormones, cell membrane receptors, nuclear receptors, steroid synthesising enzymes and other enzymes) in the pituitary, testes, adrenals, adipose tissue, kidneys and liver of male Sprague-Dawley rats after 14-day administration of the AAS nandrolone decanoate, 3 or 15 mg/kg. Plasma glucose and levels of adrenocorticotropic hormone (ACTH), adiponectin, corticosterone, ghrelin, insulin and leptin were also measured. We found several expected effects on the hypothalamic-pituitary-gonadal axis, while the treatment also caused a number of other not previously identified changes in circulating factors and gene transcription levels such as the dose-dependent reduction of the beta(3)-adrenergic receptor in adipose tissue, reduction of both circulating and mRNA levels of adiponectin, up-regulation of both hydroxymethylglutaryl-CoA-reductase, the rate-limiting enzyme in de novo synthesis of cholesterol, and the receptor for ACTH in the adrenals. The results provide evidence for wide ranging effects of AAS on the hypothalamic-pituitary-adrenal axis, adipose tissue and substrates of the renal control of blood pressure.
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| 16. |
- Bradley, Karin, 1975-, et al.
(författare)
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Hållbara staden fångad i ett postpolitiskt vakuum
- 2008
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Ingår i: Arkitekten. - 0903-2347. ; :12
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Den "täta staden" framställs som enda vägen mot framtiden. Men den vägen är varken så okontroversiell eller opolitisk som det verkar, skriver Karin Bradley, Karolina Isaksson och Lars Orrskog vid KTH.
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| 17. |
- Bugaeva, Elizaveta Y, et al.
(författare)
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Structural features of the tmRNA-ribosome interaction
- 2009
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Ingår i: RNA. - : RNA Society. - 1355-8382 .- 1469-9001. ; 15:12, s. 2312-2320
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Tidskriftsartikel (refereegranskat)abstract
- Trans-translation is a process which switches the synthesis of a polypeptide chain encoded by a nonstop messenger RNA to the mRNA-like domain of a transfer-messenger RNA (tmRNA). It is used in bacterial cells for rescuing the ribosomes arrested during translation of damaged mRNA and directing this mRNA and the product polypeptide for degradation. The molecular basis of this process is not well understood. Earlier, we developed an approach that allowed isolation of tmRNA-ribosomal complexes arrested at a desired step of tmRNA passage through the ribosome. We have here exploited it to examine the tmRNA structure using chemical probing and cryo-electron microscopy tomography. Computer modeling has been used to develop a model for spatial organization of the tmRNA inside the ribosome at different stages of trans-translation.
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| 18. |
- Chevul, Stefan, et al.
(författare)
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Measurements of Application-Perceived Throughput in DAB, GPRS, UMTS and WLAN Environments
- 2005
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Konferensbidrag (refereegranskat)abstract
- Communication services are expected to deliver the desired information in a timely manner without challenging the user’s patience. The corresponding offers by networks are reflected in user- or applications-perceived throughput, which is measured end-to-end for different mobile and wireless networks, namely Digital Audio Broadcast (DAB), General Packet Radio Service (GPRS), Universal Mobile Telecommunication Systems (UMTS), and Wireless Local Area Networks (WLAN). The measurements are based on passive monitoring of throughput statistics for active test traffic and reveal amongst others different kinds of changes of traffic burstiness induced by mobile up- and downlinks and by buffering, respectively. The results will be used for seamless communication, i.e. automatic network selection within the project PIITSA (Personal Information for Intelligent Transport Systems through Seamless communications and Autonomous decisions) aiming at maintaining user-perceived performance and security at the desired levels while keeping communication cost as small as possible.
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| 19. |
- Eisen, Olaf, et al.
(författare)
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Ground-based measurements of spatial and temporal variability of snow accumulation in East Antarctica
- 2008
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Ingår i: Reviews of Geophysics. - 8755-1209. ; 46, s. 1-39
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Tidskriftsartikel (refereegranskat)abstract
- The East Antarctic Ice Sheet is the largest, highest, coldest, driest, and windiest ice sheet on Earth. Understanding of the surface mass balance (SMB) of Antarctica is necessary to determine the present state of the ice sheet, to make predictions of its potential contribution to sea level rise, and to determine its past history for paleoclimatic reconstructions. However, SMB values are poorly known because of logistic constraints in extreme polar environments, and they represent one of the biggest challenges of Antarctic science. Snow accumulation is the most important parameter for the SMB of ice sheets. SMB varies on a number of scales, from small-scale features (sastrugi) to ice-sheet-scale SMB patterns determined mainly by temperature, elevation, distance from the coast, and wind-driven processes. In situ measurements of SMB are performed at single points by stakes, ultrasonic sounders, snow pits, and firn and ice cores and laterally by continuous measurements using ground-penetrating radar. SMB for large regions can only be achieved practically by using remote sensing and/or numerical climate modeling. However, these techniques rely on ground truthing to improve the resolution and accuracy. The separation of spatial and temporal variations of SMB in transient regimes is necessary for accurate interpretation of ice core records. In this review we provide an overview of the various measurement techniques, related difficulties, and limitations of data interpretation; describe spatial characteristics of East Antarctic SMB and issues related to the spatial and temporal representativity of measurements; and provide recommendations on how to perform in situ measurements.
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| 20. |
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| 22. |
- Göransson, Hanna, et al.
(författare)
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Quantification of normal cell fraction and copy number neutral LOH in clinical lung cancer samples using SNP array data
- 2009
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Ingår i: PloS one. - : Public Library of Science (PLoS). - 1932-6203. ; 4:6, s. e6057-
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Technologies based on DNA microarrays have the potential to provide detailed information on genomic aberrations in tumor cells. In practice a major obstacle for quantitative detection of aberrations is the heterogeneity of clinical tumor tissue. Since tumor tissue invariably contains genetically normal stromal cells, this may lead to a failure to detect aberrations in the tumor cells. PRINCIPAL FINDING: Using SNP array data from 44 non-small cell lung cancer samples we have developed a bioinformatic algorithm that accurately models the fractions of normal and tumor cells in clinical tumor samples. The proportion of normal cells in combination with SNP array data can be used to detect and quantify copy number neutral loss-of-heterozygosity (CNNLOH) in the tumor cells both in crude tumor tissue and in samples enriched for tumor cells by laser capture microdissection. CONCLUSION: Genome-wide quantitative analysis of CNNLOH using the CNNLOH Quantifier method can help to identify recurrent aberrations contributing to tumor development in clinical tumor samples. In addition, SNP-array based analysis of CNNLOH may become important for detection of aberrations that can be used for diagnostic and prognostic purposes.
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| 23. |
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| 24. |
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| 25. |
- Henriksson, Marielle, et al.
(författare)
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Cellulose nanopaper structures of high toughness
- 2008
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Ingår i: Biomacromolecules. - : American Chemical Society (ACS). - 1525-7797 .- 1526-4602. ; 9:6, s. 1579-1585
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Tidskriftsartikel (refereegranskat)abstract
- Cellulose nanofibrils offer interesting potential as a native fibrous constituent of mechanical performance exceeding the plant fibers in current use for commercial products. In the present study, wood nanofibrils are used to prepare porous cellulose nanopaper of remarkably high toughness. Nanopapers of different porosities and from nanofibrils of different molar mass are prepared. Uniaxial tensile tests are performed and structure - property relationships are discussed. The high toughness of highly porous nanopaper is related to the nanofibrillar network structure and high mechanical nanofibril performance. Also, molar mass correlates with tensile strength. This indicates that nanofibril fracture controls ultimate strength. Furthermore, the large strain-to-failure means that mechanisms, such as interfibril slippage, also contributes to inelastic deformation in addition to deformation of the nanofibrils themselves. © 2008 American Chemical Society.
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| 26. |
- Hällgren, Anita, 1963-, et al.
(författare)
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Rectal colonization and frequency of enterococcal cross-transmission among prolonged-stay patients in two Swedish intensive care units
- 2005
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Ingår i: Scandinavian Journal of Infectious Diseases. - : Informa UK Limited. - 0036-5548 .- 1651-1980. ; 37:8, s. 561-571
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Tidskriftsartikel (refereegranskat)abstract
- The aims of this study were to gain insight into the dynamics of the rectal flora during prolonged ICU stay, with a particular focus on colonization and cross-transmission with resistant pathogens, and to evaluate methods for the rapid isolation of relevant bacteria from rectal swabs. Patients admitted to a general intensive care unit (GICU) or a cardiothoracic ICU (TICU) at the University Hospital of Linköping, Sweden, between 1 November 2001 and January 2002 with a length of stay > 5 d were included (n = 20). Chromogenic UTI agar medium was used for discrimination of different species, and appropriate antibiotics were added to detect resistance. Direct plating was compared to enrichment broth for a subset of specimens. The study showed an early alteration in rectal flora, with a dramatic decrease in Gram-negative rods in favour of Gram-positive bacteria. An ampicillin- and high-level gentamicin resistant clone of Enterococcus faecium was found in 6 of 10 patients in the GICU and 2 of 11 patients in the TICU. Enrichment broth did not enhance the detection of Gram-negative bacteria compared to direct plating on Chromogenic UTI medium, but enrichment broths were needed for optimal detection of resistant Gram-positive bacteria.
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| 27. |
- Isaksson, Ann-Kristin
(författare)
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Chronic sorrow and quality of life in patients with multiple sclerosis
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The overall aim of this thesis was to increase our understanding and knowledge of patients’ experiences of living with multiple sclerosis (MS). A mixed-method design was used, including both qualitative and quantitative methods. Thirty-one immunologically treated MS patients were randomly selected and matched with patients without immunological treatment. Matching criteria were gender, impairment, time since diagnosis and age. One patient dropped out and therefore the final sample consisted of 61 patients. All 61 were interviewed (Studies I, III and IV) and completed the 36-item Short Form health survey questionnaire (SF-36), the Subjective estimation of Quality of Life questionnaire (SQoL), the Self-reported Impairment Check-list (SIC) (Study II) and the Montgomery–Asberg Depression Rating Scale questionnaire (MADRS) (Study III). The interviews were subjected to content analysis. Initial symptoms and being diagnosed with MS were described in terms of becoming vulnerable and remaining in that vulnerability long after the diagnosis. Eventually the patients were able to manage this emotional distress and acquired strength in their illness situation (Study I). In the matched analysis, 29 pairs of patients were included after internal drop-out. There were no statistically significant differences between the treatment and control groups. Concerning the total group of 61 patients, the self-reported impairment check-list showed that they had various problems of impairment, most evident in balance and walking. The score on health-related quality of life (SF-36) was reduced, disclosing a negative influence on vitality, physical role and function. However, subjective quality of life (SQoL) was not reduced, showing that the patients estimated their well-being to be quite unaffected (Study II). Thirty-eight of the 61 patients (62%) experienced chronic sorrow (Study III). The group were not depressed in general, only four having mild symptoms of depression, revealing that chronic sorrow is a particular form of emotional distress in MS. Chronic sorrow was experienced in terms of loss of hope, loss of control over the body and loss of integrity and dignity. When the patients could not adequately manage their sorrow and lacked support, they were struggling with their vulnerability. In the successful management of MS, losses and emotional distress are managed in such a way as to enhance personal growth, appreciation and trust in life. The theoretical model of chronic sorrow facilitated the sorting of the empirical data and the linking of these data to theory, showing the usefulness of the model (Study IV).
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| 28. |
- Isaksson, Ann-Kristin, 1961-, et al.
(författare)
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Quality of life and impairment in patients with multiple sclerosis
- 2005
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Ingår i: Journal of Neurology, Neurosurgery and Psychiatry. - : BMJ. - 0022-3050 .- 1468-330X. ; 76:1, s. 64-69
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: The aims of this study were to describe the quality of life in patients with multiple sclerosis (MS) given immunological treatment and in those not given immunological treatment and to investigate the relationship between impairment and quality of life. METHODS: Twenty nine patients given immunological treatment were matched with the same number of patients not given such treatment. Matching variables were sex, Kurtzke's Expanded Disability Status Scale (EDSS), years since diagnosis, and age (total n = 58). The patients were interviewed using the self-reported impairment checklist and they answered two questionnaires on quality of life, the 36-Item Short-Form Health Survey (SF-36) and the Subjective Estimation of Quality of Life (SQoL). RESULTS: The self-reported impairment checklist captured a more differentiated picture of the patients' symptoms of MS than the EDSS. Health related quality of life was markedly reduced, while the subjective quality of life was less affected. There was a stronger association between self-reported ratings of impairment and health related quality of life on the SF-36 than between impairment and global ratings of quality of life on the SQoL. Subjective quality of life on the SQoL was not directly dependent on impairment expressed in physical limitations. There were no statistically significant differences between the treated and untreated groups. A non-significant trend towards better health related quality of life was found in favour of the treated group with respect to emotional role, physical role, and social function on the SF-36. CONCLUSIONS: The self-reported impairment checklist and SF-36 proved to be valuable complements to the well established EDSS in describing the diverse symptoms of MS. Measuring both health related quality of life and subjective wellbeing provides valuable knowledge about the consequences of MS.
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| 29. |
- Isaksson, Ann-Kristin, et al.
(författare)
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The presence and meaning of chronic sorrow in patients with multiple sclerosis
- 2007
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Ingår i: Journal of Clinical Nursing. - Oxford : Blackwell. - 0962-1067 .- 1365-2702. ; 16:11C, s. 315-324
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Tidskriftsartikel (refereegranskat)abstract
- AIM AND OBJECTIVES: The aim of this study was to explore the presence and meaning of chronic sorrow and the presence of depression in a fairly large group of persons with multiple sclerosis (MS). BACKGROUND: MS is a chronic and progressive neurological disease with a variety of symptoms. The patients have to live with losses of different kinds. A few earlier studies have used the concept of chronic sorrow to illustrate the emotional situation of such patients. METHOD: Sixty-one patients were interviewed about the occurrence of chronic sorrow and, thereafter, screened for depression. Thirty-eight (62%) of them fulfilled the criteria for chronic sorrow. The interviews were analysed with latent content analysis. RESULTS: Seven themes describe the losses that caused sorrow: loss of hope, loss of control over the body, loss of integrity and dignity, loss of a healthy identity, loss of faith that life is just, loss of social relations and loss of freedom. The sorrow was constantly present or periodically overwhelming. Only four of the 38 patients with chronic sorrow had symptoms of being mildly depressed. CONCLUSION: Chronic sorrow meant loss of hope, of control over the body, of integrity and of identity. The concept of chronic sorrow complements that of depression in providing important new knowledge relevant to understanding the consequences MS can have for the individual. RELEVANCE TO CLINICAL PRACTICE: Knowledge of the meaning of chronic sorrow can contribute to the nurse's ability to give psychological support and promote a sense of hope and control in the MS patient.
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| 30. |
- Isaksson, Anders, 1965-
(författare)
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Studies on the venture capital process
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis consists of an introductory part, including venture capital definitions, the history of venture capital in Sweden, and an overview of the venture capital process, and four self-contained papers on venture capital and the venture capital process.Paper 1 investigates the standardisation of the contractual strategies applied in the Swedish venture capital industry. The study was based on a questionnaire data regarding the use of contractual covenants. Our results indicate that the greatest differences occur among those with different investment preferences. There would appear to be two distinct venture capital cultures controlling contractual choices in these groups. Our findings generally conform to expectations as predicated by institutional theory.Paper 2 investigate venture capital firms’ valuation practices in two different economic contexts, in the economic boom of 1999 and in the downturn market of 2002 by using an experimental case study design with a case based on a real firm. Contrary to our expectations, in times of heightened stringency and economic downturn, venture capital investors employ fewer valuation models than they do in boom times. The main contribution of our research is an increase in the knowledge of venture capitalists’ valuation practices under different market conditions. It can also contribute to researchers developing more relevant theories of valuation, valuation models and valuation practice.Paper 3 empirically examines the linkage between governance, trust and performance based on a questionnaire sent to entrepreneurs in venture capital backed companies in Sweden. The results suggest that the level of trust between the venture capitalist and the entrepreneur affects the relationship between VCs governance and the portfolio company’s performance.Paper 4 analyse exit strategies and exit-directed activities among entrepreneurs in venture capital relationships. The study focuses on the effect of the venture capital organization (independent, public sector and captive) on strategy and exit-directed activities. The results indicate that firms with a trade sale strategy tend to have a higher degree of exit activities compared to other exit strategies. Furthermore, the type of venture capital organization involved (especially when comparing private independent VCs to public sector VCs) also affects exit strategies and activities.
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| 31. |
- Isaksson, Björn, et al.
(författare)
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Hepatic encephalopathy verified by psychometric testing and EEG in cirrhotic patients : Effects of mesocaval interposition shunt or sclerotherapy
- 2005
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Ingår i: HPB. - : Elsevier BV. - 1365-182X .- 1477-2574. ; 7:1, s. 65-72
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Tidskriftsartikel (refereegranskat)abstract
- Background. The aim of this randomised prospective study was to evaluate hepatic encephalopathy after mesocaval interposition shunt operation and after repeated endoscopic sclerotherapy. Methods. Forty-five patients with bleeding oesophageal varices due to liver cirrhosis were randomised to the two treatment groups, 24 to the shunt group and 21 to the sclerotherapy group. The patients were evaluated preoperatively regarding blood tests, hepatic encephalopathy as measured by electroencephalogram with spectral analysis and by a battery of psychometric tests. The direction of portal flow in the shunt group was investigated by shunt phlebography and ultrasonography with Doppler. During follow-up the same investigations were performed twice at median 6.7 and 14.7 months after operation. Results. No statistically significant difference was found during follow-up regarding blood tests and electroencephalography with spectral analysis. Although the preoperative psychometric tests showed that the shunt group performed significantly better than the sclerotherapy group, the first follow-up showed that the shunt group performed statistically worse than the sclerotherapy group in seven of the tests: Synonyms (measuring verbal ability), Block Design Test (measuring visuo-spatial ability), Memory for Design Test, Error Score (measuring memory function), Revised Visual Retention Test, correct answers and the same test error answers (measuring visuo-spatial memory, ability and immediate memory), Digit Symbol Test (measuring perceptual ability) and Trial Making Test B (measuring cognitive motor abilities). Conclusions. Patients treated by mesocaval interposition shunt showed a progressive general reduction in psychometric performance compared with patients treated with repeated sclerotherapy, in whom a general intellectual improvement was observed. This finding corresponds to the reverse direction of the preoperative portal flow to a hepatofugal pattern at first follow-up and at 12 months among two-thirds of the patients. © 2005 Taylor & Francis Group Ltd.
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| 32. |
- Isaksson, Elisabeth, et al.
(författare)
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Two ice core δ18O records from Svalbard illustrating climate and sea ice variability over the last 400 years
- 2005
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Ingår i: The Holocene. - : SAGE Publications. - 0959-6836 .- 1477-0911. ; 15:4, s. 501-509
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Tidskriftsartikel (refereegranskat)abstract
- Ice cores from the relatively low-lying ice caps in Svalbard have not been widely exploited in climatic studies owing to uncertainties about the effect of meltwater percolation. However, results from two new Svalbard ice cores, at Lomonosovfonna and Austfonna, have shown that with careful site selection, high-resolution sampling and multiple chemical analyses it is possible to recover ice cores from which part of the annual signals are preserved, despite the considerable meltwater percolation. The new Svalbard ice cores are positioned in different parts of Svalbard and cover the past 800 years. In this paper we focus on the last 400 years. The 6180 signals from the cores are qualitatively similar over most of the twentieth century, suggesting that they record the same atmospheric signal. Prior to AD 1920, the Austfonna ice core exhibits more negative 6180 values than Lomonosovfonna, although there are intermittent decadal-scale periods throughout the record with similar values. We suggest that the differences reflect the effect of the inversion layer during the winter. The pattern in the 6180 records is similar to the Longyearbyen airtemperature record, but on an annual level the correlation is low. The Austfonna record correlates well with the temperature record from the more distant and southwesterly located Jan Mayen. A comparison of the ice-core and sea-ice records from this period suggests that sea-ice extent and Austfonna 6180 are related over the past 400 years. This may reflect the position of the storm tracks and their direct influence on the relatively low-altitude Austfonna. Lomonosovfonna may be less sensitive to such changes and primarily record free atmospheric changes instead of variations in sea-ice extent, the latter is probably a result of its higher elevation.
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| 33. |
- Isaksson, Magnus, et al.
(författare)
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Plasmacytoid DC promote priming of autoimmune Th17 cells and EAE
- 2009
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Ingår i: European Journal of Immunology. - : Wiley. - 0014-2980 .- 1521-4141. ; 39:10, s. 2925-2935
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Tidskriftsartikel (refereegranskat)abstract
- EAE, an animal model for MS, is a Th17 and Th1-cell-mediated autoimmune disease, but the mechanisms leading to priming of encephalitogenic T cells in autoimmune neuroinflammation are poorly understood. To investigate the role of plasmacytoid DC (pDC) in the initiation of autoimmune Th17- and Th1-cell responses and EAE, we depleted pDC with anti-pDC Ag-1 (anti-PDCA1) mAb prior to immunization of C57BL/6 mice with myelin oligodendrocyte glycoprotein (MOG). pDC-depleted mice developed less severe clinical and histopathological signs of EAE than control mice, which demonstrates a promoting role for pDC in the initiation of EAE. The levels of type I IFN were much lower in the sera from anti-PDCA1-treated mice. However, neutralization of type I IFN ameliorated the early phase of EAE but did not alter the severity of disease. Thus, only a minor part of the EAE-promoting effect of pDC appears to be mediated by IFN-alpha/beta secretion. The numbers of MOG-specific Th17 cells, but not Th1 cells, were lower in spleen from anti-PDCA1-treated mice compared with controls. In contrast, pDC depletion a week after MOG immunization resulted in more severe clinical signs of EAE. In conclusion, we demonstrate that pDC promote initiation of MOG-induced Th17-cell responses and EAE.
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| 34. |
- Isaksson, Rose-Marie, et al.
(författare)
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Time trends in symptoms and prehospital delay time in women vs. men with myocardial infarction over a 15-year period. The Northern Sweden MONICA Study.
- 2007
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Ingår i: European Journal of Cardiovascular Nursing. - : Oxford University Press (OUP). - 1474-5151 .- 1873-1953. ; 7:2, s. 152-158
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundFew studies have examined the time between onset of myocardial infarction (MI) symptoms and arrival at hospital (prehospital delay time) and symptoms in men vs. women.AimsTo describe prehospital delay time and symptoms in men vs. women with MI and to analyse trends over time and according to age.MethodsThe Northern Sweden MONICA myocardial infarction registry, 1989–2003, included 5072 men and 1470 women with a confirmed MI.ResultsTypical pain was present in 86% of the men and 81% of the women. The proportion with typical symptoms decreased over time for men and increased for women. Typical symptoms were more common among younger persons than older persons. Insufficiently reported symptoms was unchanged in men over time and decreased among women. Up to the age of 65, no gender differences were seen in the prehospital delay. In the oldest age group (65–74 years) time to hospital was longer than among the younger groups, especially among women.ConclusionThere were no major gender differences in prehospital delay or type of symptoms. However, over time the proportion with typical symptoms decreased in men and increased in women. Older patients had longer prehospital delay and less typical symptoms.
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| 35. |
- Kühme, Tobias, et al.
(författare)
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Wound contamination in cardiac surgery
- 2007
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Ingår i: APMIS : acta pathologica, microbiologica, et immunologica Scandinavica. - : Wiley. - 1600-0463. ; 115:9, s. 1001-1007
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To investigate the degree of bacterial contamination in the sternal wound during cardiac surgery and the sternal skin flora after operation in order to increase our understanding of the pathogenesis of sternal wound infections. Design: Prospective study where cultures were taken peri- and postoperatively from sternal wounds and skin. Setting: University Hospital. Patients: 201 cardiac surgery patients. Results: 89% of the patients grew bacteria from the subcutaneous sternal tissue. 98% of the patients showed bacterial growth on the surrounding skin at the end of the operation. We found both commensal and nosocomial bacteria in the sternal wound. These bacteria had different temporal distribution patterns. Coagulase-negative staphylococci (CoNS) and Propionibacterium acnes (PA) were by far the most prevalent bacteria during and after the operation. Furthermore, 41% of patients had more than 10 000 CFU/pad CoNS on the skin. There was no correlation between length of operation and number of bacteria. Men displayed higher bacterial counts than women on the skin. Conclusion: Skin preparation with ethanol/chlorhexidine is unable to suppress the physiological skin flora for the duration of a heart operation. A decrease of CoNS and PA postoperatively can be caused by competitive recolonisation of commensal and nosocomial bacteria.
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| 36. |
- Kühme, Tobias, et al.
(författare)
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Wound contamination in cardiac surgery, a systematic quantitative and qualitative study of bacterial growth in sternal wounds in cardiac surgery patients
- 2007
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Ingår i: Acta Pathologica, Microbiologica et Immunologica Scandinavica (APMIS). - : Wiley. - 0903-4641 .- 1600-0463. ; 115, s. 1001-1007
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To investigate the degree of bacterial contamination in the sternal wound during cardiac surgery and the sternal skin flora after operation in order to increase our understanding of the pathogenesis of sternal wound infections. Design: Prospective study where cultures were taken peri- and postoperatively from sternal wounds and skin. Setting: University Hospital. Patients: 201 cardiac surgery patients. Results: 89% of the patients grew bacteria from the subcutaneous sternal tissue. 98% of the patients showed bacterial growth on the surrounding skin at the end of the operation. We found both commensal and nosocomial bacteria in the sternal wound. These bacteria had different temporal distribution patterns. Coagulase-negative staphylococci (CoNS) and Propionibacterium acnes (PA) were by far the most prevalent bacteria during and after the operation. Furthermore, 41% of patients had more than 10 000 CFU/pad CoNS on the skin. There was no correlation between length of operation and number of bacteria. Men displayed higher bacterial counts than women on the skin. Conclusion: Skin preparation with ethanol/chlorhexidine is unable to suppress the physiological skin flora for the duration of a heart operation. A decrease of CoNS and PA postoperatively can be caused by competitive recolonisation of commensal and nosocomial bacteria.
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- Lanke, Elsa, et al.
(författare)
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N1421K mutation in the glycoprotein Ib binding domain impairs ristocetin- and botrocetin-mediated binding of von Willebrand factor to platelets.
- 2008
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Ingår i: European Journal of Haematology. - : Wiley. - 1600-0609 .- 0902-4441. ; 81, s. 384-390
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Tidskriftsartikel (refereegranskat)abstract
- von Willebrand disease (VWD) is a common inheritable bleeding disorder caused by deficiency of von Willebrand Factor (VWF), which is involved in platelet adhesion and aggregation. We report a family consisting of three patients with VWD characterized by an apparently normal multimeric pattern, moderately decreased plasma factor VIII (FVIII) and VWF levels, and disproportionately low plasma VWF:RCo levels. The patients were found to be heterozygous for the novel N1421K mutation, caused by a 4263C>G transversion in exon 28 of the VWF gene coding for the A1 domain. Botrocetin- and ristocetin-mediated binding of plasma VWF to GPIb were reduced in the patients. In vitro mutagenesis and expression in COS-7 cells confirmed the impairment of the mutant in botrocetin- and ristocetin-mediated VWF binding to GPIb. VWF collagen binding capacity was unaffected in plasma from the heterozygous individuals as well as in medium from transfected COS-7 cells. Our findings indicate that the N1421K substitution in the VWF affects the GPIb binding site or a recognition element by a conformational change of the A1 domain.
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- Zhao, Qing, 1976-
(författare)
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Structural and Genetic Studies of Translation in Escherichia coli
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Ribosomes are the universal ribonucleoprotein organelles that translate the genetic message from mRNA to protein. In prokaryotes, the ribosomal subunits are 30S and 50S subunit, which bind together during the translation process forming 70S ribosome. The ribosome is a highly dynamic structure, and acts as a working platform for the different factors involved in the process of converting the genetic information into protein.Cryo-electron tomography (cryo-ET) is an emerging imaging technology that combines the potential of three-dimensional (3D) reconstruction at molecular resolution with a close-to-native preservation of the specimen. Here, we have applied this method to reconstruct rifampicin-treated Escherichia coli individual 30S subunits in vitro and in situ, and individual 50S subunits in situ. In the 30S subunit, the head, the platform and the body show large conformational movements relative to each other. The particles are grouped into three conformational groups according to the width/height ratios. Also, an S15 fusion protein derivative has been used as a physical reporter to localize S15 in the 30S subunit. In the 50S subunit, the L1 stalk, the L7/L12 stalk, the central protuberance (CP), and the peptidyl transferase center (PTC) cleft are the most dynamic and flexible parts in the reconstructed structures with clear movements indicated. Different locations of the tunnel in the central cross-sections through the in situ 50S subunits indicate a flexible pathway inside the large subunit. In addition, gross morphological changes were also been observed in our reconstructions. Our results demonstrate a considerable conformational flexibility among individual ribosomal subunits, both in vitro and in situ.Translation is an essential process for all cells and organisms. Translation initiation is the rate-limiting step and the most highly regulated phase of translation process. Several regions along the mRNA have been reported to influence translation initiation. The Shine-Dalgarno (SD) sequence located 5-9 bases upstream of the initiation codon supports translation initiation by complementary binding to the Anti-Shine-Dalgarno (ASD) sequence on the 16S rRNA.We have here compared how an SD+ sequence influences gene expression, if located upstream or downstream of an initiation codon. The positive effect of an upstream SD+ is confirmed. A downstream SD+ gives decreased gene expression. If an SD+ is placed between two potential initiation codons, initiation takes place predominantly at the second start site. The first start site is activated if the distance between this site and the downstream SD+ is enlarged and/or if the second start site is weakened. Upstream initiation is eliminated if a stable stem-loop structure is placed between this SD+ and the upstream start site. The results suggest that the two start sites compete for ribosomes that bind to an SD+ located between them. A minor positive contribution to upstream initiation resulting from 3’ to 5’ ribosomal diffusion along the mRNA is suggested. Since the location of SD+ or SD-like sequences can strongly influence gene expression, this should be of significant evolutionary importance.
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