The Effects of Modeling Instruction in a High School Physics Classroom

The purpose of this research was to study my effectiveness as a high school physics teacher using a traditional approach to instruction compared to a Modeling approach. The study was conducted at a high school near Baton Rouge, Louisiana. Both groups consisted of 1 section of honors physics and 1 section of regular physics each. Conceptual understanding and problems solving gains were measured using pre/post Force Concept Inventory (FCI) and the Mechanics Baseline Test (MBT) results, respectively. Students’ level of science reasoning was also measured at the beginning of the school year only, using the Classroom Test of Scientific Reasoning (CTSR). The Modeling instruction group had significantly higher conceptual learning normalized gains as compared to the traditional instruction group. The data show no significant difference in the normalized gains in problem solving ability measured by the MBT. A gender bias was seen, with males having higher gains than females. The data showed that honors students had higher normalized learning gains compared to regular students. Students having higher scientific reasoning scores outperformed their peers in conceptual understanding and problem solving

Bullying Victimisation, Internalising Symptoms, and Conduct Problems in South African Children and Adolescents: A Longitudinal Investigation

Bullying victimisation has been prospectively linked with mental health problems among children and adolescents in longitudinal studies in the developed world. However, research from the developing world, where adolescents face multiple risks to social and emotional development, has been limited by cross-sectional designs. This is the first longitudinal study of the psychological impacts of bullying victimisation in South Africa. The primary aim was to examine prospective relationships between bullying victimisation and internalising and externalising symptoms in South African youth. Secondary aims were to examine gender and age-related differences in experiences of bullying victimisation. Children and adolescents (10–17 years, 57 % female, n = 3,515) from high HIV-prevalent (>30 %) communities in South Africa were interviewed and followed-up 1 year later (97 % retention). Census enumeration areas were randomly selected from urban and rural sites in two provinces and door-to-door sampling included all households with a resident child/adolescent. Exposure to multiple experiences of bullying victimisation at baseline predicted internalising symptoms and conduct problems 1 year later. Additionally, baseline mental health scores predicted later bullying victimisation, demonstrating bi-directionality of relationships between bullying victimisation and mental health outcomes in this sample. Expected gender differences in physical, verbal, and relational bullying victimisation were evident and predicted declines in bullying victimisation over time were observed. In the developed world, school-based anti-bullying programmes have been shown to be effective in reducing bullying and victimisation. Anti-bullying programmes should be implemented and rigorously evaluated in South Africa, as this may promote improved mental health among South African children and adolescents

Prospective associations between bullying victimisation, internalised stigma, and mental health in South African adolescents living with HIV

Background: Adolescents living with HIV may be at elevated risk of psychological problems, which are correlated with negative health outcomes. In cross-sectional research with HIV-affected adolescents, bullying victimisation and internalised HIV stigma have been associated with poorer psychological health. We extended these findings and tested longitudinal associations between bullying victimisation, internalised stigma, and mental health among adolescents living with HIV. We also tested whether relationships between bullying victimisation and psychological symptoms were mediated by internalised stigma. Method: Adolescents living with HIV (n = 1060, 10–19 years, 55% female), who had ever initiated HIV treatment in 53 public health facilities in the Eastern Cape, South Africa, were interviewed and followed up 18 months later (n = 995, 94% retention). Participants completed well-validated measures of depression, anxiety, posttraumatic stress, bullying victimisation, and internalised stigma. Results: After adjusting for baseline mental health and sociodemographic characteristics, baseline internalised stigma prospectively predicted poorer outcomes on all psychological measures

DNA methylation signatures of aggression and closely related constructs : A meta-analysis of epigenome-wide studies across the lifespan

DNA methylation profiles of aggressive behavior may capture lifetime cumulative effects of genetic, stochastic, and environmental influences associated with aggression. Here, we report the first large meta-analysis of epigenome-wide association studies (EWAS) of aggressive behavior (N = 15,324 participants). In peripheral blood samples of 14,434 participants from 18 cohorts with mean ages ranging from 7 to 68 years, 13 methylation sites were significantly associated with aggression (alpha = 1.2 x 10(-7); Bonferroni correction). In cord blood samples of 2425 children from five cohorts with aggression assessed at mean ages ranging from 4 to 7 years, 83% of these sites showed the same direction of association with childhood aggression (r = 0.74, p = 0.006) but no epigenome-wide significant sites were found. Top-sites (48 at a false discovery rate of 5% in the peripheral blood meta-analysis or in a combined meta-analysis of peripheral blood and cord blood) have been associated with chemical exposures, smoking, cognition, metabolic traits, and genetic variation (mQTLs). Three genes whose expression levels were associated with top-sites were previously linked to schizophrenia and general risk tolerance. At six CpGs, DNA methylation variation in blood mirrors variation in the brain. On average 44% (range = 3-82%) of the aggression-methylation association was explained by current and former smoking and BMI. These findings point at loci that are sensitive to chemical exposures with potential implications for neuronal functions. We hope these results to be a starting point for studies leading to applications as peripheral biomarkers and to reveal causal relationships with aggression and related traits.Peer reviewe

DNA methylation signatures of aggression and closely related constructs: A meta-analysis of epigenome-wide studies across the lifespan

DNA methylation profiles of aggressive behavior may capture lifetime cumulative effects of genetic, stochastic, and environmental influences associated with aggression. Here, we report the first large meta-analysis of epigenome-wide association studies (EWAS) of aggressive behavior (N = 15,324 participants). In peripheral blood samples of 14,434 participants from 18 cohorts with mean ages ranging from 7 to 68 years, 13 methylation sites were significantly associated with aggression (alpha = 1.2 × 10-7; Bonferroni correction). In cord blood samples of 2425 children from five cohorts with aggression assessed at mean ages ranging from 4 to 7 years, 83% of these sites showed the same direction of association with childhood aggression (r = 0.74, p = 0.006) but no epigenome-wide significant sites were found. Top-sites (48 at a false discovery rate of 5% in the peripheral blood meta-analysis or in a combined meta-analysis of peripheral blood and cord blood) have been associated with chemical exposures, smoking, cognition, metabolic traits, and genetic variation (mQTLs). Three genes whose expression levels were associated with top-sites were previously linked to schizophrenia and general risk tolerance. At six CpGs, DNA methylation variation in blood mirrors variation in the brain. On average 44% (range = 3-82%) of the aggression-methylation association was explained by current and former smoking and BMI. These findings point at loci that are sensitive to chemical exposures with potential implications for neuronal functions. We hope these results to be a starting point for studies leading to applications as peripheral biomarkers and to reveal causal relationships with aggression and related traits.</p

Application of Genomic Sequencing to Refine Patient Stratification for Adjuvant Therapy in Renal Cell Carcinoma

International audiencePurpose: Patients with resected localized clear-cell renal cell carcinoma (ccRCC) remain at variable risk of recurrence. Incorporation of biomarkers may refine risk prediction and inform adjuvant treatment decisions. We explored the role of tumor genomics in this setting, leveraging the largest cohort to date of localized ccRCC tissues subjected to targeted gene sequencing. Experimental Design: The somatic mutation status of 12 genes was determined in 943 ccRCC cases from a multinational cohort of patients, and associations to outcomes were examined in a Discovery (n = 469) and Validation (n = 474) framework. Results: Tumors containing a von-Hippel Lindau (VHL) mutation alone were associated with significantly improved outcomes in comparison with tumors containing a VHL plus additional mutations. Within the Discovery cohort, those with VHL+0, VHL+1, VHL+2, and VHL+≥3 tumors had disease-free survival (DFS) rates of 90.8%, 80.1%, 68.2%, and 50.7% respectively, at 5 years. This trend was replicated in the Validation cohort. Notably, these genomically defined groups were independent of tumor mutational burden. Amongst patients eligible for adjuvant therapy, those with a VHL+0 tumor (29%) had a 5-year DFS rate of 79.3% and could, therefore, potentially be spared further treatment. Conversely, patients with VHL+2 and VHL+≥3 tumors (32%) had equivalent DFS rates of 45.6% and 35.3%, respectively, and should be prioritized for adjuvant therapy. Conclusions: Genomic characterization of ccRCC identified biologically distinct groups of patients with divergent relapse rates. These groups account for the ∼80% of cases with VHL mutations and could be used to personalize adjuvant treatment discussions with patients as well as inform future adjuvant trial design

DNA methylation signatures of a broad spectrum of aggressive behavior: a meta-analysis of epigenomewide studies across the lifespan

Here we report an EWAS meta-analysis (EWAMA) of broadly defined aggressive behavior in peripheral blood samples for 14,434 participants from 18 cohorts with mean ages ranging from 7 to 68 years, and cord blood samples for 2,425 children from 5 cohorts with aggression assessed at ages ranging from 4 to 7 years. In an additional group of 1235 9-year old children and 172 children enrolled in a childhood psychiatric clinic, buccal cell-derived DNA methylation profiles were available. In blood samples, 13 methylation sites were significantly associated with aggression after Bonferroni correction. No epigenome-wide significant sites were found in cord blood samples, but 83% of these sites showed the same direction of association in cord blood with aggression in childhood (r = 0.74, p = 0.006). Regression coefficients based on analyses in buccal cells and blood overall showed no directional consistency. Top-sites (FDR \ 0.05) from the analysis of blood samples in children and adults were previously reported for association with chemical exposures, smoking, cognition, metabolic traits, and mQTLs. Three genes whose expression levels were associated with top-sites were previously linked to schizophrenia and general risk tolerance, pointing to loci that are correlated with substance use and chemical exposures, as well as genetic variation. At some loci, DNA methylation variation in blood mirrors variation in the brain. Epigenetic profiles may capture lifetime cumulative effects of genetic, stochastic, and environmental influences associated with aggression. Our findings may serve as potential biomarkers and possibly indicate causal relationships with aggression and form a basis for future projectsAplinkotyros katedraVytauto Didžiojo universiteta