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| 4. |
- Went, M, et al.
(författare)
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Author Correction: Identification of multiple risk loci and regulatory mechanisms influencing susceptibility to multiple myeloma
- 2019
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Ingår i: Nature communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 10:1, s. 213-
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Tidskriftsartikel (refereegranskat)abstract
- The original version of this Article contained an error in the spelling of a member of the PRACTICAL Consortium, Manuela Gago-Dominguez, which was incorrectly given as Manuela Gago Dominguez. This has now been corrected in both the PDF and HTML versions of the Article. Furthermore, in the original HTML version of this Article, the order of authors within the author list was incorrect. The PRACTICAL consortium was incorrectly listed after Richard S. Houlston and should have been listed after Nora Pashayan. This error has been corrected in the HTML version of the Article; the PDF version was correct at the time of publication.
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| 8. |
- Jiang, X., et al.
(författare)
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Shared heritability and functional enrichment across six solid cancers
- 2019
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 10
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Tidskriftsartikel (refereegranskat)abstract
- Quantifying the genetic correlation between cancers can provide important insights into the mechanisms driving cancer etiology. Using genome-wide association study summary statistics across six cancer types based on a total of 296,215 cases and 301,319 controls of European ancestry, here we estimate the pair-wise genetic correlations between breast, colorectal, head/neck, lung, ovary and prostate cancer, and between cancers and 38 other diseases. We observed statistically significant genetic correlations between lung and head/neck cancer (r(g) = 0.57, p = 4.6 x 10(-8)), breast and ovarian cancer (r(g) = 0.24, p = 7 x 10(-5)), breast and lung cancer (r(g) = 0.18, p = 1.5 x 10(-6)) and breast and colorectal cancer (r(g) = 0.15, p = 1.1 x 10(-4)). We also found that multiple cancers are genetically correlated with non-cancer traits including smoking, psychiatric diseases and metabolic characteristics. Functional enrichment analysis revealed a significant excess contribution of conserved and regulatory regions to cancer heritability. Our comprehensive analysis of cross-cancer heritability suggests that solid tumors arising across tissues share in part a common germline genetic basis.
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- Olofsson, P. S., et al.
(författare)
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Genetic variants of TNFSF4 and risk for carotid artery disease and stroke
- 2009
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Ingår i: Journal of Molecular Medicine. - New York : Springer. - 0946-2716 .- 1432-1440. ; 87:4, s. 337-346
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Tidskriftsartikel (refereegranskat)abstract
- In two independent human cohorts, the minor allele of SNP rs3850641 in TNFSF4 was significantly more frequent in individuals with myocardial infarction than in controls. In mice, Tnfsf4 expression is associated with increased atherosclerosis. The expression of TNFSF4 in human atherosclerosis and the association between genotype and cerebrovascular disease have not yet been investigated. TNFSF4 messenger RNA (mRNA) levels were significantly higher in human atherosclerotic lesions compared with controls (730∈±∈30 vs 330∈±∈65 arbitrary units, p∈<∈0.01). TNFSF4 was mainly expressed by macrophages in atherosclerotic lesions. In cell culture, endothelial cells upregulated TNFSF4 in response to tumor necrosis factor alpha (TNF-α; 460∈±∈110 vs 133∈±∈8 arbitrary units, p∈<∈0.001 after 6 h of stimulation). We analyzed the TNFSF4 gene in 239 patients who had undergone carotid endarterectomy and 138 matching controls from The Biobank of Karolinska Carotid Endarterectomies and Stockholm Heart Epidemiology Program cohorts and 929 patients and 1,382 matching controls from the Sahlgrenska Academy Study on Ischemic Stroke and Case Control Study of Stroke cohorts, limiting inclusion to patients with ischemic stroke. Participants were genotyped for the rs3850641 SNP in TNFSF4. Genotype associations were neither found with TNFSF4 mRNA levels nor with atherosclerosis associated systemic factors or risk for stroke. This study shows that TNFSF4 is expressed on antigen-presenting cells in human carotid atherosclerotic lesions but provides no evidence for an association of TNFSF4 gene variation with the risk for ischemic stroke.
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- Wiklund, U, et al.
(författare)
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Endoscopic transthoracic sympathicotomy affects the autonomic modulation of heart rate in patients with palmar hyperhidrosis
- 2000
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Ingår i: Acta Neurochirurgica. - : Springer Science and Business Media LLC. - 0001-6268 .- 0942-0940. ; 142:6, s. 691-696
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Palmar hyperhidrosis has been associated with an increased activity of the sympathetic nervous system. The objective of this study was to assess the immediate and long-term effects of endoscopic transthoracic sympathicotomy on the autonomic modulation of the heart rate in patients with palmar hyperhidrosis.METHODS: Power spectrum analysis of heart rate variability in the lying position and after passive tilt to the upright position was performed in thirteen patients the day before and after sympathicotomy. A follow-up recording was performed in ten patients approximately six months later. Recordings from 26 healthy subjects were used as a reference group.FINDINGS: The patients had a tendency to higher power of the low-frequency (LF: 0.04-0.15 Hz) and high-frequency (HF; above 0.15 Hz) components than controls in the upright position. After sympathicotomy LF power was reduced, but HF power was unchanged. At follow-up LF power remained at a lower level, but now HF power was reduced.INTERPRETATION: Patients with palmar hyperhidrosis have a sympathetic overactivity but also a compensatory high parasympathetic activity. Sympathicotomy results in an initial sympathovagal imbalance with a parasympathetic predominance, which is restored on a long-term basis.
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- Almby, K. E., et al.
(författare)
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Two-year follow-up after gastric bypass surgery : sustained beneficial effect on metabolic health and hormonal dynamics in subjects with type 2 diabetes
- 2020
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Ingår i: Diabetologia. - : Springer. - 0012-186X .- 1432-0428. ; 63:SUPPL 1, s. S263-S263
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background and aims: Gastric bypass surgery (GBP) not only reduces weight but improves glycaemic control in type 2 diabetes (T2DM) patients as well. To explore the mechanisms behind this, we studied the metabolic effects of GBP over time using an integrative approach.Materials and methods: We conducted a prospective study of 13 subjects with T2DM since 4 ±3 years, treated with oral glucose lowering drugs (GLD), recruited before their GBP surgery (3M/ 10F, age 51 ± 9 years). Subjects were assessed at preoperative baseline (BL) and four weeks (4W), six months (6M) and two years (2Y) post-operatively. During visits, fasting hormone and metabolite levels were measured, as well as resting heart rate variability (HRV) followed by subcutaneous adipose tissue (AT) biopsies, a 30 min 5 gram IV-arginine challenge (ARG) and a 180 min oral glucose tolerance test (OGTT).Results: All but one subject discontinued their GLD after surgery and remained without antidiabetic drugs at 2Y follow-up. HbA1c was reduced after surgery and remained at non-diabetic levels at 2Y (see Table. SD=standard deviation. SEM=standard error of the mean. P-value from Student’s T-test). Fasting insulin was reduced significantly 4W after surgery (28.0 ±10.8 mE/L vs 14.4 ±10.8 mE/L) and even lower at 6M (8.9 ±5.6 mE/L) and 2Y (8.0 ±6.2 mE/L). Fasting cortisol was significantly lower than BL at 4W, but significantly increased relative to BL levels at 6M. ACTH was lower than BL at 4W and 6M (borderline significant), but returned to BL levels at 2Y. Insulin excursions after arginine stimulation were markedly reduced 4W after surgery and remained so at 6M and 2Y (data not shown). At all time points after surgery, peak p-glucose during OGTT occurred earlier, as did the consequent drop in glucose levels. The secretion of insulin during OGTT mirrored this pattern. Total GLP-1 levels during OGTT (area under the curve=AUC) increased significantly 4W after surgery and remained increased at 6M and 2Y. AUC for GIP during OGTT had decreased significantly 4W after surgery and continued to do so for 6M and 2Y. Both GLP-1 and GIP however showed an earlier peak in secretion. HOMA-IR improved after surgery (see Table) and remained so at 2Y. Total body fat decreased with GBP (Table), as did adipocyte cell size vs BL (diameter 110.7±11.2 μm) at 4W (94.9±13.1 μm, p=0.013), 6M (101.6±13.1 μm, p=0.0035) and 2Y (93.1±12.7 μm, p<0.001).Conclusion: GBP improves glucose control in T2DM and reduces the need for GLD. Beneficially effects on metabolic parameters and adipocyte morphology are still seen after 2Y of follow-up. A marked increase in AUC for GLP-1 whereas AUC for GIP decreases after surgery, although both have an earlier peak in secretion during OGTT. A decrease in morning cortisol is seen at 4W after GBP, but no concomitant rise in ACTH, suggesting a central mechanism might affect cortisol and in turn contribute to early improvements in glucose homeostasis.
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| 21. |
- Askelöf, U., et al.
(författare)
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Wait a minute? : An observational cohort study comparing iron stores in healthy Swedish infants at 4 months of age after 10-, 60- and 180-second umbilical cord clamping
- 2017
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Ingår i: BMJ Open. - : BMJ Publishing Group. - 2044-6055. ; 7:12
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Tidskriftsartikel (refereegranskat)abstract
- Background and objective: Umbilical cord blood (UCB) is a valuable stem cell source used for transplantation. Immediate umbilical cord (UC) clamping is widely practised, but delayed UC clamping is increasingly advocated to reduce possible infant anaemia. The aim of this study was to investigate an intermediate UC clamping time point and to evaluate iron status at the age of 4 months in infants who had the UC clamped after 60 s and compare the results with immediate and late UC clamping. Design: Prospective observational study with two historical controls. Setting: A university hospital in Stockholm, Sweden, and a county hospital in Halland, Sweden. Methods: Iron status was assessed at 4 months in 200 prospectively recruited term infants whose UC was clamped 60 s after birth. The newborn baby was held below the uterine level for the first 30 s before placing the infant on the mother's abdomen for additional 30 s. The results were compared with data from a previously conducted randomised controlled trial including infants subjected to UC clamping at ≤10 s (n=200) or ≥180 s (n=200) after delivery. Results: After adjustment for age differences at the time of follow-up, serum ferritin concentrations were 77, 103 and 114 μg/L in the 10, 60 and 180 s groups, respectively. The adjusted ferritin concentration was significantly higher in the 60 s group compared with the 10 s group (P=0.002), while the difference between the 60 and 180 s groups was not significant (P=0.29). Conclusion: In this study of healthy term infants, 60 s UC clamping with 30 s lowering of the baby below the uterine level resulted in higher serum ferritin concentrations at 4 months compared with 10 s UC clamping. The results suggest that delaying the UC clamping for 60 s reduces the risk for iron deficiency. © 2017 Article author(s).
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| 24. |
- Berger, M, et al.
(författare)
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The multilayer effect in abrasion : optimising the combination of hard and tough phases
- 1999
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Ingår i: Surface & Coatings Technology. - : ELSEVIER SCIENCE SA. - 0257-8972 .- 1879-3347. ; 116-119, s. 1138-1144
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In the present investigation it is shown that the wear resistance of multilayer PVD coatings, combining relatively soft but tough chromium (Cr) and harder but more brittle chromium nitride (CrN): exceeds that of both its phases. This striking exception to
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| 25. |
- Blanckenhorn, Wolf U, et al.
(författare)
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Proximate causes of Rensch's rule : Does sexual size dimorphism in arthropods result from sex differences in development time?
- 2007
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Ingår i: American Naturalist. ; 169:2, s. 245-257
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Tidskriftsartikel (refereegranskat)abstract
- A prominent interspecific pattern of sexual size dimorphism (SSD) is Rensch's rule, according to which male body size is more variable or evolutionarily divergent than female body size. Assuming equal growth rates of males and females, SSD would be entirely mediated, and Rensch's rule proximately caused, by sexual differences in development times, or sexual bimaturism (SBM), with the larger sex developing for a proportionately longer time. Only a subset of the seven arthropod groups investigated in this study exhibits Rensch's rule. Furthermore, we found only a weak positive relationship between SSD and SBM overall, suggesting that growth rate differences between the sexes are more important than development time differences in proximately mediating SSD in a wide but by no means comprehensive range of arthropod taxa. Except when protandry is of selective advantage ( as in many butterflies, Hymenoptera, and spiders), male development time was equal to ( in water striders and beetles) or even longer than ( in drosophilid and sepsid flies) that of females. Because all taxa show female-biased SSD, this implies faster growth of females in general, a pattern markedly different from that of primates and birds (analyzed here for comparison). We discuss three potential explanations for this pattern based on life-history trade-offs and sexual selection.
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| 35. |
- Dinca, Vlad, et al.
(författare)
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Reproductive isolation and patterns of genetic differentiation in a cryptic butterfly species complex
- 2013
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Ingår i: Journal of Evolutionary Biology. - : Wiley. - 1010-061X .- 1420-9101. ; 26:10, s. 2095-2106
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Tidskriftsartikel (refereegranskat)abstract
- Molecular studies of natural populations are often designed to detect and categorize hidden layers of cryptic diversity, and an emerging pattern suggests that cryptic species are more common and more widely distributed than previously thought. However, these studies are often decoupled from ecological and behavioural studies of species divergence. Thus, the mechanisms by which the cryptic diversity is distributed and maintained across large spatial scales are often unknown. In 1988, it was discovered that the common Eurasian Wood White butterfly consisted of two species (Leptidea sinapis and Leptidea reali), and the pair became an emerging model for the study of speciation and chromosomal evolution. In 2011, the existence of a third cryptic species (Leptidea juvernica) was proposed. This unexpected discovery raises questions about the mechanisms preventing gene flow and about the potential existence of additional species hidden in the complex. Here, we compare patterns of genetic divergence across western Eurasia in an extensive data set of mitochondrial and nuclear DNA sequences with behavioural data on inter- and intraspecific reproductive isolation in courtship experiments. We show that three species exist in accordance with both the phylogenetic and biological species concepts and that additional hidden diversity is unlikely to occur in Europe. The Leptidea species are now the best studied cryptic complex of butterflies in Europe and a promising model system for understanding the formation of cryptic species and the roles of local processes, colonization patterns and heterospecific interactions for ecological and evolutionary divergence.
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| 39. |
- Erickson, LC, et al.
(författare)
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Cohesion in plasma-sprayed coatings - A comparison between evaluation methods
- 1998
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Ingår i: WEAR. - : ELSEVIER SCIENCE SA. - 0043-1648. ; 214:1, s. 30-37
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The integrity, and especially, the cohesive strength of alumina plasma-sprayed coatings prepared from a range of precursor powders of different size and crystallinity has been investigated by several different methods. Several chromia, and alumina-titania
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| 44. |
- Glover, AG, et al.
(författare)
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The London Workshop on the Biogeography and Connectivity of the Clarion-Clipperton Zone
- 2016
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Ingår i: Research Ideas and Outcomes. - : Pensoft Publishers. - 2367-7163. ; 2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background Recent years have seen a rapid increase in survey and sampling expeditions to the Clarion-Clipperton Zone (CCZ) abyssal plain, a vast area of the central Pacific that is currently being actively explored for deep-sea minerals (ISA, 2016). Critical to the development of evidence-based environmental policy in the CCZ are data on the biogeography and connectivity of species at a CCZ-regional level. New information The London Workshop on the Biogeography and Connectivity of the CCZ was convened to support the integration and synthesis of data from European Union (EU) CCZ projects, supported by the EU Managing Impacts of Deep-Sea Resource Exploitation (MIDAS) and EU Joint Programming Initiative Healthy and Productive Seas and Oceans (JPI Oceans) projects. The London Workshop had three clear goals: (1) To explore, review and synthesise the latest molecular biogeography and connectivity data from across recent CCZ cruises from both contractor and academia-funded projects; (2) To develop complementary and collaborative institutional and program-based academic publication plans to avoid duplication of effort and ensure maximum collaborative impact; (3) To plan a joint synthetic data publication highlighting key results from a range of planned molecular biogeography/connectivity publications. 32 participants attended the workshop at the Natural History Museum in London from 10-12 May 2016. Presentations and discussions are summarised in this report covering (1) overviews of current CCZ environmental projects, (2) policy and industry perspectives, (3) synthesis of DNA taxonomy and biogeography studies, (4) summaries of the latest population genetic studies, (5) summaries of the latest broader morphological context, (6) an overview of publication and proposal plans to maximise collaborative opportunities and finally a series of workshop recommendations.
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| 45. |
- Goel, Sneha, 1993-, et al.
(författare)
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Hybrid powder-suspension Al2O3-ZrO2 coatings by axial plasma spraying : Processing, characteristics & tribological behaviour
- 2017
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Ingår i: Proceedings of the International Thermal Spray Conference & Exposition. - New York : Curran Associates, Inc. - 9781510858220 ; , s. 374-379
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Konferensbidrag (refereegranskat)abstract
- The ability of suspension plasma spraying (SPS) to overcome difficulties associated with feeding of fine (submicron or nano-sized) powders and achieve more refined microstructures than possible in atmospheric plasma spraying (APS) is well established. In recent times, the use of axial injection plasma spray systems has yielded substantial enhancement in deposition rates/efficiencies due to improved thermal exchange between the plasma plume and injected feedstock. The present paper describes utilization of both the above advances in plasma spraying to create various function-dependent coating architectures through simultaneous and/or sequential spraying of hybrid powder-suspension feedstock. A specific variant of such hybrid axial plasma spraying that enables deposition of composite coatings by simultaneous injection of a powder and a suspension is discussed in particular detail. Results obtained using an Al2O3-ZrO2 material system as a case study reveal that composite coatings combining the micron-size features arising from the spray-grade Al2O3 powder and submicron or nano-sized features attributable to the ZrO2 suspension can be conveniently realized. The surface morphology, microstructure, and composition of these coatings, as well as their tribological behaviour determined using scratch and ball-on-disc tests, are presented herein. The utility of this method to develop a wide array of composite coatings is also discussed.
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| 49. |
- Gunnars, Jens, et al.
(författare)
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Determination of growth-induced strain and thermo-elastic properties of coatings by curvature measurements
- 2002
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Ingår i: Materials Science & Engineering. - 0921-5093 .- 1873-4936. ; 336:1-2, s. 7-21
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Tidskriftsartikel (refereegranskat)abstract
- Curvature measurements on bimaterial specimens are examined for determination of residual strain/stress and thermo-elastic properties of coatings and layered materials. By using specimens with material layers of comparable thickness, large deflections and thereby high measurement accuracy are obtained. Strain-curvature relations are given for beam and plate specimens at different deformation modes. A robust fitting method for simultaneous determination of the mismatch strain and the modulus of elasticity is described. Experiments are performed on a titanium nitride (TiN) coating deposited on a thick high-speed steel substrate by PVD. The modulus of elasticity and the thermal expansion coefficient for the TiN coating are determined to 500 GPa and 7.4 x 10 exp -6 K exp -1 , respectively. The characteristic residual stress, i.e. the thin-film stress at room temperature, is -3.8 GPa, for this material combination and deposition conditions. The temperature independent growth-induced strain is determined to -0.0045, which is 75% of the mismatch strain at room temperature.
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