Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"twin study"”.
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Age-related genetic and epigenetic chromosomal changes: A twin study
The primary aims of this study were to examine acquired genetic and epigenetic changes that occur in individuals with increasing age and to determine how these changes are influenced by genetic/environmental factors. Acquired genetic changes were assessed by determining the frequency and …
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A Twin Study of Antisocial Behavior and Depression: Methodology, Etiology, and Comorbidity
… a sample of 2,291 young adult male and female twins from the Young Adult Follow Up Study (YAFU) of the Virginia Twin Study of Adolescent Behavioral Development (VTSABD) were used to estimate the proportion of variation in these traits that can be accounted for by additive genetic, shared …
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The inheritance of retinal blood vessel patterns in man: a twin study
This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).
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The contribution of nonshared environmental factors to differential parental discipline: A twin study
… with differential parental discipline. This study utilized a behavior genetics twin study design to control for extraneous influences, such age and life changes, which may significantly impact a parents' use of discipline. Participants in this study consisted of 38 families (36 twin pairs, 2 …
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Relationships between Dimensions of Religiosity and Internalizing and Externalizing Psychiatric Disorders: A Twin Study
The present study estimated the genetic and environmental effects on different dimensions of religiosity, explored how genetic and environmental effects covary across different dimensions of religiosity, and decomposed the covariance of genetic and environmental effects between different dimensions …
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BIOLOGICAL AND ENVIRONMENTAL PREDICTORS OF EXTERNALIZING BEHAVIOR IN LATE CHILDHOOD AND ADOLESCENCE: A TWIN STUDY
This study examined the role of birth complications, delinquent peers and siblings, and specific dopamine receptors on the development of externalizing behavior in children and adolescents, along with the role of heritability in aggression and delinquency. Specifically, it was hypothesized that …
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Parenting styles in relation to body weight and smoking and drinking in children and adolescents: a longitudinal twin study
… retrieved from the first two waves of the German Twin Family Panel. Participants comprised three birth cohorts aged 5, 11, and 17 years, with approximately 500 pairs of same-sex monozygotic (MZ) twins and 500 pairs of same-sex dizygotic twins (DZ) per cohort. Self-reported parenting styles were …
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Heritability of Spontaneous Otoacoustic Emissions
… hypothesized that SOEs were inherited. This twin study was planned to pursue their idea. A total of 60 sets of twins with essentially normal hearing were examined for SOEs to determine whether they were inherited. There were 30 sets of monozygotic (MZ) and 30 sets of same-sex, dizygotic (DZ) …
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THE EFFECTS OF AGE AND HETEROCHROMATIN ON FREQUENCIES OF ACQUIRED CHROMOSOMAL ANEUPLOIDY IN UNCULTURED HUMAN LEUKOCYTES
… (FISH) technology has enabled investigators to study interphase cells, thereby overcoming problems inherent with the study of metaphase spreads for acquired aneuploidy assessment. Despite all the advantages of this technique, there are some limitations that could be misleading when scoring …
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Genetic and environmental influences on impulsivity and coping motives for alcohol across emerging and young adulthood
… were conducted in the Missouri Adolescent Female Twin Study (MOAFTS, for current analyses ns =1,017-1476), a study of a birth cohort of female like-sex twin pairs. Analyses involving DRD4 2- and 5- repeat allele carries vs. others yielded findings inconsistent with the existing GXE personality …
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The assessment and heritability of a brief measure of agency
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms
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Psychosis and aggression in childhood & adolescence: investigations in clinically referred, inpatient and general population samples
… Hospital over a 40 year period; the second study involved new data collection by the author, and focused on young people admitted to inpatient units (n=106); the third (n=2,232) involved secondary data analysis and used data from the Environmental Risk Longitudinal Twin Study, a non-referred …
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Comparison of Reading Development Across Socioeconomic Status in the United States
… across levels of parental SES. The current study predicted a differential relation between parental SES and both predictors and outcomes because of the known large relation between parental SES and child oral language development. Three questions examined the mediating effects of cognitive …
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Biomarkers of fat intake
… to measure changes in fatty acid patterns. A co-twin study design conducted in 570 female participants enrolled in the St Thomas‟ Twins Study investigated the heritability of fatty acid biomarkers (adipose tissue and plasma). For most fatty acids, environmental factors (dietary intake) were …
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Retrieval induced forgetting in depression and schizophrenia: role of mood and the cholinergic system
… healthy control comparisons, a group of twin pairs diagnosed with schizophrenia and a group of healthy twin pairs. Within depression and schizophrenic both groups demonstrated the standard pattern of RIF. However this effect was significantly reduced in the clinical groups in comparison …
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Natural variation in the human plasma lipidome signature using mass spectrometry: relevance to healthy ageing
… ageing studies - the Sydney Memory and Ageing Study (MAS), the Hunter Community Study (HCS) and the Sydney Centenarian Study (SCS); (3) examined the influence of APOE genotype on the plasma lipidome (n=152); and (4) evaluated the relative contribution of genetic and environmental influences on …
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COOPERATION AND COMPETITION AS A FUNCTION OF ZYGOSITY IN 7 TO 9 YEAR OLD SINGAPORE TWINS
This study focused on the question of whether there is a clear genetic basis for the human social behaviours "cooperation" and "competition". Cooperation and competition were hypothesised to vary with genetic relatedness between the people engaging in these behaviours. A classic twin study, with …
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Bioinformatische Analyse der NUGAT-Studie (NUtriGenomic Analysis in Twins)
… ist. In der NUtriGenomic Analysis in Twins-Studie wurden 46 Zwillingspaare (34 monozygot, 12 dizygot) über einen Zeitraum von sechs Wochen mittels einer kohlenhydratreichen, fettarmen Diät nach Richtlinien der Deutschen Gesellschaft für Ernährung für ihr Ernährungsverhalten …
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Determinants of vascular health in young people
… vascular outcomes for body size and composition. Study one (Chapter 4) addressed the question of scaling, by evaluating the efficacy of scaling vascular dimensions and FMD for different body composition variables using allometric and ratio procedures, with the aim of producing size independent …
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Infrared thermography (IRT) for the assessment of microvascular skin blood flow in a specialist connective tissue disease unit
… for the assessment of peripheral vasospasm in a twin study into the heritability of RP. The utility of inspection of thermograms for detecting clinically active LS lesions was established. A protocol was developed incorporating photography, IRT and laser Doppler flowmetry (LDF) for LS assessment, …
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