Bar-Ilan University

About: Bar-Ilan University is a education organization based out in Ramat Gan, Israel. It is known for research contribution in the topics: Population & Poison control. The organization has 12835 authors who have published 34964 publications receiving 995648 citations. The organization is also known as: Bar Ilan University & BIU.

The importance of neutral examples for learning sentiment

Abstract: Most research on learning to identify sentiment ignores “neutral” examples, learning only from examples of significant (positive or negative) polarity. We show that it is crucial to use neutral examples in learning polarity for a variety of reasons. Learning from negative and positive examples alone will not permit accurate classification of neutral examples. Moreover, the use of neutral training examples in learning facilitates better distinction between positive and negative examples.

Cross-national time trends in bullying victimization in 33 countries among children aged 11, 13 and 15 from 2002 to 2010.

Abstract: BACKGROUND: Bullying among children and adolescents is a public health concern; victimization is associated with psychological and physical health problems. The purpose of this study is to examine temporal trends in bullying victimization among school-aged children in Europe and North America. METHODS: Data were obtained from cross-sectional self-report surveys collected as part of the Health Behaviour in School-aged Children (HBSC) study from nationally representative samples of 11-, 13- and 15-year-olds, from 33 countries and regions which participated in the 2001-02, 2005-06 and 2009-10 surveys. Responses from 581 838 children were included in the analyses. Binary logistic regression was used for the data analyses. RESULTS: The binary logistic regression models showed significant decreasing trends in occasional and chronic victimization between 2001-02 and 2009-10 across both genders in a third of participating countries. One country reported significant increasing trends for both occasional and chronic victimization. Gender differences in trends were evident across many countries. CONCLUSION: Overall, while still common in many countries, bullying victimization is decreasing. The differences between countries highlight the need to further investigate measures undertaken in countries demonstrating a downward trend. Language: en

Automated analysis of high-throughput B-cell sequencing data reveals a high frequency of novel immunoglobulin V gene segment alleles

Abstract: Individual variation in germline and expressed B-cell immunoglobulin (Ig) repertoires has been associated with aging, disease susceptibility, and differential response to infection and vaccination. Repertoire properties can now be studied at large-scale through next-generation sequencing of rearranged Ig genes. Accurate analysis of these repertoire-sequencing (Rep-Seq) data requires identifying the germline variable (V), diversity (D), and joining (J) gene segments used by each Ig sequence. Current V(D)J assignment methods work by aligning sequences to a database of known germline V(D)J segment alleles. However, existing databases are likely to be incomplete and novel polymorphisms are hard to differentiate from the frequent occurrence of somatic hypermutations in Ig sequences. Here we develop a Tool for Ig Genotype Elucidation via Rep-Seq (TIgGER). TIgGER analyzes mutation patterns in Rep-Seq data to identify novel V segment alleles, and also constructs a personalized germline database containing the specific set of alleles carried by a subject. This information is then used to improve the initial V segment assignments from existing tools, like IMGT/HighV-QUEST. The application of TIgGER to Rep-Seq data from seven subjects identified 11 novel V segment alleles, including at least one in every subject examined. These novel alleles constituted 13% of the total number of unique alleles in these subjects, and impacted 3% of V(D)J segment assignments. These results reinforce the highly polymorphic nature of human Ig V genes, and suggest that many novel alleles remain to be discovered. The integration of TIgGER into Rep-Seq processing pipelines will increase the accuracy of V segment assignments, thus improving B-cell repertoire analyses.

Photoinduced Reversible Structural Transformations in Free-Standing CH3NH3PbI3 Perovskite Films

Abstract: In the pursuit to better understand the mechanisms of perovskite solar cells we performed Raman and photoluminescence measurements of free-standing CH3NH3PbI3 films, comparing dark with working conditions. The films, grown on a glass substrate and sealed by a thin glass coverslip, were measured subsequent to dark and white-light pretreatments. The extremely slow changes we observe in both the Raman and photoluminescence cannot be regarded as electronic processes, which are much faster. Thus, the most probable explanation is of slow photoinduced structural changes. The CH3NH3PbI3 transformation between the dark and the light structures is reversible, with faster rates for the changes under illumination. The results seem to clarify several common observations associated with solar cell mechanisms, like performance improvement under light soaking. More important is the call for solar-cell-related investigation of CH3NH3PbI3 to take the photoinduced structural changes into consideration when measuring and int...

Emotional processing in eating disorders: specific impairment or general distress related deficiency?

Abstract: The literature on eating disorders emphasizes the relationship between alexithymia and anorexia nervosa on the one hand, and between bulimia nervosa and affect dysregulation on the other. In our study, two questions are addressed: (1) Are there different patterns of emotional processing deficiencies in anorexia and bulimia? and (2) Is there a unique contribution of eating disorders to emotional processing deficiencies? Participants were women with anorexia nervosa (ANs, n=20), bulimia nervosa (BNs, n=20), and normal controls (NCs, n=20). Three hypotheses were examined: (1) Women with eating disorders will exhibit lower emotional awareness and more deficient emotional regulation than will NCs (emotional deficiency); (2) ANs will be less emotionally aware than BNs, whereas BNs will be less capable of effective emotional regulation than ANs (disorder specificity); and (3) emotional distress will mediate the relationships between emotional processing and eating disorders (emotional distress mediation). Results supported the emotional deficiency and distress mediation hypotheses, and partially supported the disorder specificity hypothesis. The need to move beyond alexithymia in understanding the pattern of emotional processing deficiencies in eating disorders is discussed.