| 1. |
- Estival, Dominique, et al.
(författare)
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Learning from OzCLO, the Australian Computational and Linguistics Olympiad
- 2013
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Ingår i: 51st Annual Meeting of the Association for Computational Linguistics. - Sofia : Association for Computational Linguistics. - 9781937284695 ; , s. 35-41
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Konferensbidrag (refereegranskat)abstract
- The Australian Computational and Linguistics Olympiad (OzCLO) started in 2008 in only two locations and has since grown to a na- tionwide competition with almost 1500 high school students participating in 2013. An Aus- tralian team has participated in the Interna- tional Linguistics Olympiad (ILO) every year since 2009. This paper describes how the competition is run (with a regional First Round and a final National Round) and the or- ganisation of the competition (a National Steering Committee and Local Organising Committees for each region) and discusses the particular challenges faced by Australia (tim- ing of the competition and distance between the major population centres). One major fac- tor in the growth and success of OzCLO has been the introduction of the online competi- tion, allowing participation of students from rural and remote country areas. The organisa- tion relies on the good-will and volunteer work of university and school staff but the strong interest among students and teachers shows that OzCLO is responding to a demand for linguistic challenges.
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| 2. |
- Haggård, Linnea, et al.
(författare)
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High prevalence of celiac disease in autoimmune hepatitis : Systematic review and meta-analysis
- 2021
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Ingår i: Liver international (Print). - : Wiley-Blackwell Publishing Inc.. - 1478-3223 .- 1478-3231. ; 41:11, s. 2693-2702
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Forskningsöversikt (refereegranskat)abstract
- BACKGROUND: Previous studies investigating the prevalence of celiac disease (CD) in individuals with autoimmune hepatitis (AIH) have shown highly variable results. We therefore aimed to examine the prevalence of CD in individuals with AIH.METHODS: Two professional librarians searched PubMed, EMBASE, Cochrane and Web of Science Core Collection up until 7 February 2020. The search terms included 'celiac disease', 'celiac', 'transglutaminases', 'gluten', 'gliadin', 'EMA', 'TTG' and 'villous' combined with 'autoimmune', 'hepatitis', 'ANA', 'SMA' and 'LKM'. This search yielded 2419 unique publications. A systematic review based on the PRISMA guidelines resulted in 31 articles eligible for full text review. Fifteen articles were deemed relevant, with 8 being included in our main analysis. A fixed-effect inverse variance-weighted model was used, and heterogeneity was calculated.RESULTS: Our main analysis included 567 individuals with AIH from eight studies, where biopsy-verified CD (equivalent to Marsh III) was seen in 23 individuals (4.1%). The pooled prevalence of CD in AIH was 3.5% (95% CI = 1.6%-5.3%) (heterogeneity: P = .874; I2 = 0.0%), which is clearly higher than the 1% CD seen in most general populations. When also including studies where CD had been diagnosed through positive serology without biopsy (15 studies: n = 1817 individuals with AIH), the pooled prevalence of CD was 2.9% (95% CI = 2.1%-3.8%) (heterogeneity: P < .001; I2 = 66.8%).CONCLUSION: Our results demonstrate a higher prevalence of CD in individuals with AIH compared to the general population. CD screening may be considered in patients with AIH.
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| 3. |
- Hecker, Yanina P., et al.
(författare)
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A Neospora caninum vaccine using recombinant proteins fails to prevent foetal infection in pregnant cattle after experimental intravenous challenge
- 2014
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Ingår i: Veterinary Immunology and Immunopathology. - : Elsevier BV. - 0165-2427 .- 1873-2534. ; 162:3-4, s. 142-153
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the present study was to evaluate the immunogenicity and protective efficacy of rNcSAG1, rNcHSP20 and rNcGRA7 recombinant proteins formulated with immune stimulating complexes (ISCOMs) in pregnant heifers against vertical transmission of Neospora caninum. Twelve pregnant heifers were divided into 3 groups of 4 heifers each, receiving different formulations before mating. Immunogens were administered twice subcutaneously: group A animals were inoculated with three recombinant proteins (rNcSAG1, rNcHSP20, rNcGRA7) formulated with ISCOMs; group B animals received ISCOM-MATRIX (without antigen) and group C received sterile phosphate-buffered saline (PBS) only. The recombinant proteins were expressed in Escherichia coil and purified nickel resin. All groups were intravenously challenged with the NC-1 strain of N. caninum at Day 70 of gestation and dams slaughtered at week 17 of the experiment. Heifers from group A developed specific antibodies against rNcSAG1, rNcHSP20 and rNcGRA7 prior to the challenge. Following immunization, an statistically significant increase of antibodies against rNcSAG1 and rNcHSP20 in all animals of group A was detected compared to animals in groups B and C at weeks 5, 13 and 16 (P< 0.001). Levels of antibodies against rNcGRA7 were statistical higher in group A animals when compared with groups B and Cat weeks 5 and 16 (P> 0.001). There were no differences in IFN-gamma production among the experimental groups at any time point (P> 0.05). Transplacental transmission was determined in all foetuses of groups A, B and C by Western blot, immunohistochemistry and nested PCR. This work showed that rNcSAG1, rNcHSP20 and rNcGRA7 proteins while immunogenic in cattle failed to prevent the foetal infection in pregnant cattle challenged at Day 70 of gestation.
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| 4. |
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| 5. |
- Sharma, Rajani, et al.
(författare)
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Cancer Risk in Patients With Autoimmune Hepatitis : A Nationwide Population-Based Cohort Study With Histopathology
- 2022
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Ingår i: American Journal of Epidemiology. - : Oxford University Press. - 0002-9262 .- 1476-6256. ; 191:2, s. 298-319
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Tidskriftsartikel (refereegranskat)abstract
- We aimed to determine the risk of incident cancer in autoimmune hepatitis (AIH) compared with the general population and siblings. AIH was defined by the presence of a medical diagnosis of AIH and results of examination of a liver biopsy specimen in a nationwide Swedish population-based cohort study. We identified 5,268 adults with AIH diagnosed during 1969-2016 and 22,996 matched, general population, reference individuals and 4,170 sibling comparators. Using Cox regression, hazard ratios were determined for any incident cancer, and subtypes were determined from the Swedish Cancer Register. During follow-up, a cancer diagnosis was made in 1,119 individuals with AIH (17.2 per 1,000 person-years) and 4,450 reference individuals (12.0 per 1,000 person-years). This corresponded to a hazard ratio of 1.53 (95% confidence interval: 1.42, 1.66). Cancer risk was highest in those with cirrhosis. There was a 29.18-fold increased risk of hepatocellular carcinoma (HCC) (95% confidence interval: 17.52, 48.61). The annual incidence risk of HCC in individuals with AIH who had cirrhosis was 1.1% per year. AIH was also linked to nonmelanoma skin cancer (hazard ratio (HR) = 2.69) and lymphoma (HR = 1.89). Sibling analyses yielded similar risk estimates for any cancer (HR = 1.84) and HCC (HR = 23.10). AIH is associated with an increased risk of any cancer, in particular, HCC and extrahepatic malignancies. The highest risk for cancer, especially HCC, is in patients with cirrhosis.
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| 6. |
- Sharma, Rajani, et al.
(författare)
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Increased Mortality Risk in Autoimmune Hepatitis : A Nationwide Population-based Cohort Study With Histopathology
- 2021
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Ingår i: Clinical Gastroenterology and Hepatology. - : Elsevier. - 1542-3565 .- 1542-7714. ; 19:12, s. 2636-2647.e13
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND AND AIMS: Autoimmune hepatitis (AIH) is a chronic inflammatory liver disease that may lead to cirrhosis and liver failure, but data on overall mortality in AIH are conflicting.METHODS: This was a nationwide population-based cohort study in Sweden from 1969-2017 of 6,016 adults with AIH and 28,146 matched general population reference individuals. AIH was defined by a combination of a medical diagnosis of AIH plus a liver biopsy from any of Sweden's 28 pathology departments. Through Cox regression, we estimated hazard ratios (HRs) for overall and cause-specific death. Liver transplant was included in our main outcome of death.RESULTS: During follow-up, 3,185 individuals with AIH died (41.4/1000 person-years) compared with 10,477 reference individuals (21.9/1000 person-years). The 10-year cumulative incidence of death was 32.3% (95%CI=31.1-33.6) for AIH individuals and 14.1% (95%CI=13.7-14.5) for reference individuals. This corresponded to an adjusted HR of 2.29 (95%CI=2.17-2.41), which remained elevated ≥20 years follow-up. AIH individuals with cirrhosis on biopsy had a high risk of death (HR=4.55; 95%CI=3.95-5.25), while mortality in patients with fibrosis, inflammation without fibrosis, or necrosis did not differ. Portal hypertension and overlap with cholestatic liver diseases were also associated with death. AIH was associated with an increased risk of death from cardiovascular disease (HR=1.27; 95%CI=1.15-1.40), liver disease (HR=66.24; 95%CI=48.19-91.03) and extrahepatic malignancy (HR=1.69; 95%CI=1.51-1.89). In a sibling comparison, AIH individuals remained at increased risk of death.CONCLUSION: AIH is associated with a 2-fold increased risk of death. Risks were particularly high in individuals with cirrhosis, portal hypertension, and overlap with cholestatic liver disease.
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| 7. |
- Verna, C, et al.
(författare)
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High symbiont diversity in the bone-eating worm Osedax mucofloris from shallow whale-falls in the North Atlantic
- 2010
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Ingår i: Environmental Microbiology. - 1462-2912. ; 12:8, s. 2355-2370
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Tidskriftsartikel (refereegranskat)abstract
- Osedax worms are whale-fall specialists that infiltrate whale bones with their root tissues. These are filled with endosymbiotic bacteria hypothesized to provide their hosts with nutrition by extracting organic compounds from the whale bones. We investigated the diversity and distribution of symbiotic bacteria in Osedax mucofloris from shallow-water whale-falls in the North Atlantic using comparative 16S rRNA sequence analysis and fluorescence in situ hybridization (FISH). We observed a higher diversity of endosymbionts than previously described from other Osedax species. Endosymbiont sequences fell into eight phylogenetically distinct clusters (with 91.4–98.9% similarity between clusters), and considerable microdiversity within clusters (99.5–99.7% similarity) was observed. Statistical tests revealed a highly significant effect of the host individual on endosymbiont diversity and distribution, with 68% of the variability between clusters and 40% of the variability within clusters explained by this effect. FISH analyses showed that most host individuals were dominated by endosymbionts from a single cluster, with endosymbionts from less abundant clusters generally confined to peripheral root tissues. The observed diversity and distribution patterns indicate that the endosymbionts are transmitted horizontally from the environment with repeated infection events occurring as the host root tissues grow into the whale bones.
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| 10. |
- Verna, Gaia, et al.
(författare)
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HAWC J2227+610: a potential PeVatron candidate for the CTA in the northern hemisphere
- 2022
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Ingår i: 37th International Cosmic Ray Conference (ICRC2021) - GAI - Gamma Ray Indirect. - Trieste, Italy : Sissa Medialab. - 1824-8039. ; 395
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Konferensbidrag (refereegranskat)abstract
- Recent observations of the gamma-ray source HAWC J2227+610 by Tibet AS+MD and LHAASO confirm the special interest of this source as a galactic PeVatron candidate in the northern hemisphere. HAWC J2227+610 emits Very High Energy (VHE) gamma-rays up to 500 TeV, from a region coincident with molecular clouds and significantly displaced from the nearby pulsar J2229+6114. Even if this morphology favours an hadronic origin, both leptonic or hadronic models can describe the current VHE gamma-ray emission. The morphology of the source is not well constrained by the present measurements and a better characterisation would greatly help the understanding of the underlying particle acceleration mechanisms. The Cherenkov Telescope Array (CTA) will be the future most sensitive Imaging Atmospheric Cherenkov Telescope and, thanks to its unprecedented angular resolution, could contribute to better constrain the nature of this source. The present work investigates the potentiality of CTA to study the morphology and the spectrum of HAWC J2227+610. For this aim, the source is simulated assuming the hadronic model proposed by the Tibet AS+MD collaboration, recently fitted on multi-wavelength data, and two spatial templates associated to the source nearby molecular clouds. Different CTA layouts and observation times are considered. A 3D map based analysis shows that CTA is able to significantly detect the extension of the source and to attribute higher detection significance to the simulated molecular cloud template compared to the alternative one. CTA data does not allow to disentangle the hadronic and the leptonic emission models. However, it permits to correctly reproduce the simulated parent proton spectrum characterized by a ∼ 500 TeV cutoff. © Copyright owned by the author(s) under the terms of the Creative Commons.
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