4 results on '"Sebastian Wachs"'
Search Results
2. Does social support moderate the relationship between racial discrimination and aggression among Latinx adolescents? A longitudinal study
- Author
-
Sebastian Wachs and Michelle F. Wright
- Subjects
Male ,Parents ,Longitudinal study ,Adolescent ,Social Psychology ,media_common.quotation_subject ,education ,Friends ,050109 social psychology ,Racism ,Peer Group ,Developmental psychology ,Social support ,Negatively associated ,Developmental and Educational Psychology ,medicine ,Humans ,0501 psychology and cognitive sciences ,Longitudinal Studies ,Association (psychology) ,media_common ,Models, Statistical ,Aggression ,05 social sciences ,Social Support ,Hispanic or Latino ,Moderation ,Psychiatry and Mental health ,Pediatrics, Perinatology and Child Health ,Female ,Self Report ,medicine.symptom ,Psychology ,050104 developmental & child psychology - Abstract
Introduction This study examined the relationship between racial discrimination by peers and aggression (i.e., self-reported and peer-nominated relational aggression and physical aggression) across one year through the moderation of social support from parents, friends, and teachers. Methods Participants were 606 Latinx adolescents from the United States (60% girls; M = 14.36, SD = 0.46). They completed self-report questionnaires on their perceived racial discrimination by peers, and self-reported and peer-nominated relational and physical aggression. Results & conclusions Racial discrimination by peers was negatively associated with social support from parents, friends, and teachers, as well as positively related to all forms of Time 2 (1 year) self-reported and peer-nominated relational aggression and physical aggression. Social support from parents, friends, and teachers were negatively related to all forms of Time 2 aggressive behaviors. Increases in social support from parents, friends, and teachers weakened the positive association between racial discrimination by peers and Time 2 self-reported and peer-nominated relational aggression, while lower levels of social support strengthened this association. There were no significant moderating effects of social support from parents, social support, and close friends found for Time 2 self-reported and peer-nominated physical aggression. These findings indicate that high social support from parents, friends, and teachers impacts Latinx adolescents reduces the impact of racial discrimination by peers on adolescents' relational aggression.
- Published
- 2019
3. Bullying and alexithymia: Are there differences between traditional, cyber, combined bullies, and nonbullies in reading their own emotions?
- Author
-
Michelle F. Wright and Sebastian Wachs
- Subjects
Male ,Adolescent ,media_common.quotation_subject ,Emotions ,Self-concept ,Child Behavior ,Poison control ,050109 social psychology ,Suicide prevention ,Occupational safety and health ,Pathology and Forensic Medicine ,Alexithymia ,Surveys and Questionnaires ,Reading (process) ,Injury prevention ,medicine ,Humans ,0501 psychology and cognitive sciences ,Affective Symptoms ,Child ,Crime Victims ,media_common ,05 social sciences ,Bullying ,Human factors and ergonomics ,General Medicine ,16. Peace & justice ,medicine.disease ,Self Concept ,Psychiatry and Mental health ,Adolescent Behavior ,Female ,Self Report ,Psychology (miscellaneous) ,Psychology ,050104 developmental & child psychology ,Clinical psychology - Abstract
Background Few studies have examined alexithymia, the inability to identify or describe one's emotions, as a possible correlate of bullying. Aims To investigate whether there are differences among 12-18 year-olds in capacity for identifying and/or describing own emotions between traditional bullies, cyber bullies, combined bullies, and nonbullies. Methods Data from self-report questionnaires completed by 897 female and 652 male 12-18 year-olds (mean 14.5 years, standard deviation 1.68) from Germany and Thailand were analysed using analysis of covariance. Results Young people who reported never having bullied others scored lower on the alexithymia scale than traditional, cyber, or combined bullies. There were no differences between traditional and cyber bullies on this measure, but those who operated in both ways had significantly higher alexithymia scores compared with those who bullied in just one modality. Conclusion Alexithymia is thus likely to be an important factor to consider in prevention and treatment of bullying. We recommend that prevention programmes include elements to help identify and describe one's own emotions, providing additional support, and "training" if alexithymia is identified. When young people use cyber techniques and traditional bullying methods, it seems likely that they will have greatest need in this respect.
- Published
- 2018
4. Single exosome study reveals subpopulations distributed among cell lines with variability related to membrane content
- Author
-
Zachary J. Smith, Changwon Lee, Tatu Rojalin, Randy P. Carney, Sidhartha Hazari, Alisha Knudson, Kit Lam, Heikki Saari, Elisa Lazaro Ibañez, Tapani Viitala, Timo Laaksonen, Marjo Yliperttula, and Sebastian Wachsmann-Hogiu
- Subjects
exosomes ,microvesicles ,single particle ,Raman ,laser trap ,membrane content ,Cytology ,QH573-671 - Abstract
Current analysis of exosomes focuses primarily on bulk analysis, where exosome-to-exosome variability cannot be assessed. In this study, we used Raman spectroscopy to study the chemical composition of single exosomes. We measured spectra of individual exosomes from 8 cell lines. Cell-line-averaged spectra varied considerably, reflecting the variation in total exosomal protein, lipid, genetic, and cytosolic content. Unexpectedly, single exosomes isolated from the same cell type also exhibited high spectral variability. Subsequent spectral analysis revealed clustering of single exosomes into 4 distinct groups that were not cell-line specific. Each group contained exosomes from multiple cell lines, and most cell lines had exosomes in multiple groups. The differences between these groups are related to chemical differences primarily due to differing membrane composition. Through a principal components analysis, we identified that the major sources of spectral variation among the exosomes were in cholesterol content, relative expression of phospholipids to cholesterol, and surface protein expression. For example, exosomes derived from cancerous versus non-cancerous cell lines can be largely separated based on their relative expression of cholesterol and phospholipids. We are the first to indicate that exosome subpopulations are shared among cell types, suggesting distributed exosome functionality. The origins of these differences are likely related to the specific role of extracellular vesicle subpopulations in both normal cell function and carcinogenesis, and they may provide diagnostic potential at the single exosome level.
- Published
- 2015
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.