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twin research

Wenjin Yang, Baodan Liu, Tao Fang, Weimmerskirch-Aubatin Jennifer, Labbé Christophe, Zhaosheng Li, Xinglai Zhang, Xin Jiang
Two-dimensional semiconductors with layer thicknesses of a few nanometers to tens of nanometers have attracted tremendous research interest due to their fascinating electrical, optical, and optoelectronic properties and technologically important applications. In this work, two dimensional ternary ZnIn2S4 nanosheets which self-assemble into microflowers have been synthesized through a feasible chemical vapour deposition process. High-resolution transmission electron microscope (HRTEM) analysis reveals that the ZnIn2S4 nanostructure exhibits an extremely high phase purity and a single crystal nature free of dislocations, stacking faults or twins...
October 18, 2016: Nanoscale
Elisabeth Hahn, Juliana Gottschling, Wiebke Bleidorn, Christian Kandler, Marion Spengler, Anna E Kornadt, Wiebke Schulz, Reinhardt Schunck, Tina Baier, Kristina Krell, Volker Lang, Franziska Lenau, Anna-Lena Peters, Martin Diewald, Rainer Riemann, Frank M Spinath
The German twin family study 'TwinLife' was designed to enhance our understanding of the development of social inequalities over the life course. The interdisciplinary project investigates mechanisms of social inequalities across the lifespan by taking into account psychological as well as social mechanisms, and their genetic origin as well as the interaction and covariation between these factors. Main characteristics of the study are: (1) a multidimensional perspective on social inequalities, (2) the assessment of developmental trajectories in childhood, adolescence, and young adulthood in a longitudinal design by using (3) a combination of a multi-cohort cross-sequential and an extended twin family design, while (4) capturing a large variation of behavioral and environmental factors in a representative sample of about 4,000 German twin families...
October 17, 2016: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
Sally J Wadsworth, John C DeFries, Erik G Willcutt, Bruce F Pennington, Richard K Olson
Because of recent concerns about the replication of published results in the behavioral and biomedical sciences (Ioannidis, PLoS Medicine, Vol. 2, 2005, p. e124; Open Science Collaboration, Science, Vol. 349, 2015, p. 943; Pashler & Wagenmakers, Perspectives on Psychological Science, Vol. 7, 2012, pp. 528-530), we have conducted a replication of our recently published analyses of longitudinal reading performance and attention deficit-hyperactivity disorder data from twin pairs selected for reading difficulties (Wadsworth et al...
October 17, 2016: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
K N Anderson, J J Connor, A F Koerner, M A Rueter
STUDY QUESTION: Compared to families with IVF singletons, what are parental depressive, parent-adolescent interaction and adolescent adjustment outcomes in families with 11-17-year-old IVF twins? SUMMARY ANSWER: No differences were detected for any measured outcome between families with 11-17-year-old IVF twins and those with IVF singletons, despite high statistical power. WHAT IS KNOWN ALREADY: When IVF twins are younger than 5-years-old, parents tend to have more mental health difficulties and poorer parent-child interactions relative to IVF singletons...
October 15, 2016: Human Reproduction
Tellervo Korhonen, Anu Ranjit, Annamari Tuulio-Henriksson, Jaakko Kaprio
BACKGROUND: Cigarette smoking and depression are major public health concerns, but longitudinal research on the association between smoking and antidepressant use is scarce. The purpose of this study was to investigate, whether smoking predicts antidepressant medication during a 10-year follow-up. METHODS: A questionnaire was administered to Finnish adult twins in 1990. Antidepressant prescription data during 1995-2004 were obtained from the register of the Finnish Social Insurance Institution and linked to the survey data...
September 27, 2016: Journal of Affective Disorders
María Paz Bidondo, Boris Groisman, Agostina Tardivo, Fabián Tomasoni, Verónica Tejeiro, Inés Camacho, Mariana Vilas, Rosa Liascovich, Pablo Barbero
BACKGROUND: Diprosopus is a subtype of symmetric conjoined twins with one head, facial duplication and a single trunk. Diprosopus is a very rare congenital anomaly. METHODS: This is a systematic review of published cases and the presentation of two new cases born in Argentina. We estimated the prevalence of conjoined twins and diprosopus using data from the National Network of Congenital Anomalies of Argentina (RENAC). RESULTS: The prevalence of conjoined twins in RENAC was 19 per 1,000,000 births (95% confidence interval, 12-29)...
October 5, 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
Maj Vinberg
This study investigated a high-risk sample in order to elucidate risk factors for affective disorder. Healthy monozygotic (MZ) and dizygotic (DZ) twins with and without a co-twin with a history of affective disorder were identified through nationwide registers. Two risk groups were identified: the high-risk group comprised twins at risk of developing affective disorder (DZ or MZ twin; index co-twin affected); the low risk group (control group) comprised twins at low risk of developing affective disorder (DZ or MZ twin; index co-twin not affected)...
October 2016: Danish Medical Journal
Michael Rutter
Translational research focuses on innovation in healthcare settings, but this is a two-way process that may have implications for either treatment or prevention. Smoking and lung cancer and the fetal alcohol syndrome are used as examples. Experimental medicine that budges basic and clinical science often constitutes a key way forward. Areas of scientific progress and challenge are discussed in relation to drug action, social cognition, cognitive neuroscience, molecular genetics, gene-environment interaction, and epigenetics...
October 3, 2016: Development and Psychopathology
Rabih Moshourab, Henning Frenzel, Stefan Lechner, Julia Haseleu, Valérie Bégay, Damir Omerbašić, Gary R Lewin
Tests that allow the precise determination of psychophysical thresholds for vibration and grating orientation provide valuable information about mechanosensory function that are relevant for clinical diagnosis as well as for basic research. Here, we describe two psychophysical tests designed to determine the vibration detection threshold (automated system) and tactile spatial acuity (handheld device). Both procedures implement a two-interval forced-choice and a transformed-rule up and down experimental paradigm...
2016: Journal of Visualized Experiments: JoVE
Catherine Tuvblad, Kostas A Fanti, Henrik Andershed, Olivier F Colins, Henrik Larsson
There is limited research on the genetic and environmental bases of psychopathic personality traits in children. In this study, psychopathic personality traits were assessed in a total of 1189 5-year-old boys and girls drawn from the Preschool Twin Study in Sweden. Psychopathic personality traits were assessed with the Child Problematic Traits Inventory, a teacher-report measure of psychopathic personality traits in children ranging from 3 to 12 years old. Univariate results showed that genetic influences accounted for 57, 25, and 74 % of the variance in the grandiose-deceitful, callous-unemotional, and impulsive-need for stimulation dimensions, while the shared environment accounted for 17, 48 and 9 % (n...
September 28, 2016: European Child & Adolescent Psychiatry
Helena Sá, Rita Leal, Manuel Santos Rosa
To deride the hope of progress is the ultimate fatuity, the last word in poverty of spirit and meanness of mind. There is no need to be dismayed by the fact that we cannot yet envisage a definitive solution of our problems, a resting-place beyond which we need not try to go. -P.B. Medawar, 1969* [Formula: see text] Thomas E. Starlz, also known as the Father of Clinical Transplantation, once said that organ transplantation was the supreme exception to the rule that most major advances in medicine spring from discoveries in basic science [Starzl T...
September 28, 2016: International Reviews of Immunology
Noah C Venables, Brian M Hicks, James R Yancey, Mark D Kramer, Lindsay D Nelson, Casey M Strickland, Robert F Krueger, William G Iacono, Christopher J Patrick
Threat sensitivity (THT) and weak inhibitory control (or disinhibition; DIS) are trait constructs that relate to multiple types of psychopathology and can be assessed psychoneurometrically (i.e., using self-report and physiological indicators combined). However, to establish that psychoneurometric assessments of THT and DIS index biologically-based liabilities, it is important to clarify the etiologic bases of these variables and their associations with clinical problems. The current work addressed this important issue using data from a sample of identical and fraternal adult twins (N=454)...
September 23, 2016: International Journal of Psychophysiology
Jack Wilkinson, Stephen A Roberts, Marian Showell, Daniel R Brison, Andy Vail
STUDY QUESTION: Which outcome measures are reported in RCTs for IVF? SUMMARY ANSWER: Many combinations of numerator and denominator are in use, and are often employed in a manner that compromises the validity of the study. WHAT IS KNOWN ALREADY: The choice of numerator and denominator governs the meaning, relevance and statistical integrity of a study's results. RCTs only provide reliable evidence when outcomes are assessed in the cohort of randomised participants, rather than in the subgroup of patients who completed treatment...
September 22, 2016: Human Reproduction
Aloise de Codt, Pauline Monhonval, Xavier Bongaerts, Ikram Belkacemi, Juan Martin Tecco
BACKGROUND: Bipolar disorder is a chronic psychiatric disease with a high prevalence and is a major psychosocial and medical burden. The exact etiological pathways of bipolar disorder are not fully understood. Genetic factors are known to play an important role in the etiology of bipolar disorder. However, high rates of discordance among identical twins and a growing body of evidence that environmental factors such as early stress can influence the onset and course of psychiatric diseases underline the importance of additional etiological mechanisms of bipolar disorders...
September 2016: Psychiatria Danubina
Karen L Mansfield, Ashley C Banyard, Anthony R Fooks, Richard Franka, Shrikrishna Isloor, Abdul Rahman
Earlier this year, Tony Fooks and colleagues described how, under a laboratory twinning project run by the World Organisation for Animal Health (OIE), the UK's OIE Reference Laboratory for rabies, based at the APHA in Weybridge, had been working with the Changchun Veterinary Research Institute in the People's Republic of China to help the institute develop into an OIE Reference Laboratory itself (VR, March 5, 2016, vol 178, pp 231-232). Now, the APHA is taking part in a further three-year project to build rabies diagnosis capability in Bangalore, India, as he and his colleagues explain below...
September 24, 2016: Veterinary Record
Hongjuan Li, Chengye Ji, Liu Yang, Cheng Zhuang
BACKGROUND: Dehydroepiandrosterone sulphate (DHEAS), the most plentiful circulating adrenal hormone, may be considered as a marker of the onset of adrenarche and is involved in pubertal development and metabolic disorders. AIM: The objective of this study is to determine the genetic and environmental influences on the variation of basal DHEAS levels and pubertal development in pubertal girls. SUBJECTS AND METHODS: Three hundred and sixty twin girls aged 6-18-years were enrolled, consisting of 132 monozygotic pairs and 48 dizygotic pairs...
October 17, 2016: Annals of Human Biology
Holger W Unger, Per Ashorn, Jordan E Cates, Kathryn G Dewey, Stephen J Rogerson
BACKGROUND: In low-resource settings, malaria and macronutrient undernutrition are major health problems in pregnancy, contributing significantly to adverse pregnancy outcomes such as preterm birth and fetal growth restriction. Affected pregnancies may result in stillbirth and neonatal death, and surviving children are at risk of poor growth and infection in infancy, and of non-communicable diseases in adulthood. Populations exposed to macronutrient undernutrition frequently reside in malaria-endemic areas, and seasonal peaks of low food supply and malaria transmission tend to coincide...
2016: BMC Medicine
D Castelló, Y Motato, N Basile, J Remohí, M Espejo-Catena, M Meseguer
Can the time-lapse system (TLS) identify the best embryo for transfer? Although there are several studies that support this hypothesis, more research is required to improve the quality of the current evidence and also to assess live birth rate, miscarriage, stillbirth or clinical pregnancy in order to choose between a TLS or conventional incubation. In addition, although some authors report on effectiveness and safety in the use of TLS monitoring of embryo development in vitro, other authors that have not found relevant differences between the two systems for the culture and subsequence embryo selection...
October 2016: Molecular Human Reproduction
GwangPyo Ko
Recently, there were dramatically increased interests on human microbiome research worldwide. Human microbiome has been considered as the second genome in addition to our own genome and played very crucial roles in maintaining human health. Human microbiota typically reside on the surface of epithelial cells and play various biological roles ranging from metabolism, immune development, mental health, and to organ development. Since 2008, we have determined the diversity of Korean microbiome and determined the genes and pathways of gut microbiome using Korean Twin Cohort...
September 2016: Journal of Hypertension
L Squarcina, C Fagnani, M Bellani, C A Altamura, P Brambilla
The pathogenesis of bipolar disorder (BD) is to date not entirely clear. Classical genetic research showed that there is a contribution of genetic factors in BD, with high heritability. Twin studies, thanks to the fact that confounding factors as genetic background or family environment are shared, allow etiological inferences. In this work, we selected twin studies, which focus on the relationship between BD, genetic factors and brain structure, evaluated with magnetic resonance imaging. All the studies found differences in brain structure between BD patients and their co-twins, and also in respect to healthy controls...
September 19, 2016: Epidemiology and Psychiatric Sciences
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