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  • 1
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 26 June 2012, Vol.109(26), pp.10426-31
    Description: Iron/sulfur cluster (ISC)-containing proteins are essential components of cells. In most eukaryotes, Fe/S clusters are synthesized by the mitochondrial ISC machinery, the cytosolic iron/sulfur assembly system, and, in photosynthetic species, a plastid sulfur-mobilization (SUF) system. Here we show that the anaerobic human protozoan parasite Blastocystis, in addition to possessing ISC and iron/sulfur assembly systems, expresses a fused version of the SufC and SufB proteins of prokaryotes that it has acquired by lateral transfer from an archaeon related to the Methanomicrobiales, an important lineage represented in the human gastrointestinal tract microbiome. Although components of the Blastocystis ISC system function within its anaerobic mitochondrion-related organelles and can functionally replace homologues in Trypanosoma brucei, its SufCB protein has similar biochemical properties to its prokaryotic homologues, functions within the parasite's cytosol, and is up-regulated under oxygen stress. Blastocystis is unique among eukaryotic pathogens in having adapted to its parasitic lifestyle by acquiring a SUF system from nonpathogenic Archaea to synthesize Fe/S clusters under oxygen stress.
    Keywords: Biological Evolution ; Blastocystis -- Metabolism ; Iron-Sulfur Proteins -- Metabolism
    ISSN: 00278424
    E-ISSN: 1091-6490
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  • 2
    Language: English
    In: Personality and Individual Differences, January 2013, Vol.54(2), pp.169-173
    Description: ► We examined the factorial invariance of trait EI across sex and age. ► We tested sex and age-related differences across trait EI factors. ► GEIS scales exhibit measurement and structural invariance. ► We found sex and age differences in various trait EI dimensions. Little is known about the factorial invariance and latent mean difference across sex and age in trait emotional intelligence (EI). The purpose of this study was to examine whether the measurement structure underlying trait EI is equivalent across sex and age groups. The sample consisted of 2919 teenagers, youths and adults. In order to investigate the above hypothesis the measurement and structural equivalence as well as the equality of latent means of scores across sex and age were tested. The multi-group confirmatory factor analysis results revealed that configural, metric, scalar and structural invariance exist across sex and age samples. Findings regarding the latent mean differences across sex and age groups are discussed with reference to recent and past findings.
    Keywords: Trait Emotional Intelligence ; Factorial Invariance ; Gender Differences ; Age Differences ; Psychology
    ISSN: 0191-8869
    E-ISSN: 1873-3549
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  • 3
    Language: English
    In: Aggression and Violent Behavior, November 2016, Vol.31, pp.186-199
    Description: Bullying perpetration and peer victimization has long been considered an important social and clinical problem. Children and adolescents who are bullied are at increased risk for mental health problems. The aim of this study was to investigate the relationship between self-esteem and bullying behavior (i.e. perpetration and peer victimization) using meta-analytic procedures. Online databases up to June 2014 were searched, and bibliographies of retrieved studies were examined, for studies that examined the association between self-esteem and bullying perpetration/peer victimization in children and adolescents. From an original pool of 936 studies, 121 non duplicated studies were identified that met criteria for inclusion. Possible moderators (e.g. age, source of bullying assessment, year of publication, etc.) were also examined. In the analyses, using a random-effects model, it was found that peer victimization is negatively associated with self-esteem, with a mean effect size of = − 0.27. A negative but trivial association was also found ( = − 0.07) between bullying behavior and self-esteem. Results of various sensitivity analyses revealed these effects to be robust, with little evidence of selection (publication) bias. The implications of the meta-analytic findings for future research on bullying perpetration and peer victimization prevention are discussed.
    Keywords: Bullying, Bullying Perpetration ; Peer Victimization ; Self-Esteem ; Meta-Analysis ; Psychology
    ISSN: 1359-1789
    E-ISSN: 1873-6335
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  • 4
    Language: English
    In: Child Psychiatry & Human Development, 2012, Vol.43(2), pp.238-253
    Description: This study examined the factorial structure of the Parental Bonding Instrument (PBI) in the Greek population. Using confirmatory factor analysis different proposed models of the basic dimensions of PBI were evaluated. The results indicated that Kendler’s three-factor (i.e. care, protectiveness and authoritarianism) solution was found to be more satisfactory than the other competing two-, three- and four-factor models. A second aim was the investigation of the factorial invariance of the PBI across different age groups (adults vs. children). The results revealed that PBI can be used in children samples (measurement invariance) but it seems that PBI latent variables may be perceived differently across different age groups (not structural invariance). The authors conclude that further research is needed in order to understand whether the differences are due to actual developmental changes in children’s perceptions of the parent–child relationship or conceptual problems regarding the children’s ability to conceive the PBI’s theoretical constructs.
    Keywords: Parenting ; Parental bonding inventory (PBI) ; Construct validity ; Cross-cultural validation
    ISSN: 0009-398X
    E-ISSN: 1573-3327
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  • 5
    Language: English
    In: Comprehensive Psychiatry, Oct, 2015, Vol.62, p.51(12)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.comppsych.2015.06.003 Byline: Ioannis Tsaousis, Chrysoula Zouraraki, Penny Karamaouna, Leda Karagiannopoulou, Stella G. Giakoumaki Abstract: The Schizotypal Personality Questionnaire (SPQ) is a widely used scale for measuring schizotypal characteristics modeled on DSM-III-R criteria for schizotypal personality disorder (SPD). The aim of this study was to examine the factorial structure of the Greek SPQ, its factorial invariance across gender and different age groups and possible gender and age group differences at latent mean level.
    ISSN: 0010-440X
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Personality and Individual Differences, August 2012, Vol.53(3), pp.175-179
    Description: ► GFPs were extracted from the Big Five and Giant Three in one sample ( = 274). ► There was substantial overlap between the two GFPs (mean = .60). ► The GFPs were strongly related to trait emotional intelligence (TEI). ► GFP–TEI relationships remained intact after controlling for social desirability bias. We extracted General Factors of Personality (GFPs) from inventories based on the Big Five model and on Eysenck’s Giant Three model within one sample ( = 274). The GFPs from the two inventories showed considerable overlap, ranging from .52 to .67 (in absolute values). The mean intercorrelation was = .60. Moreover, the GFPs showed strong overlap with measures of trait emotional intelligence ( = .72). These correlations remained substantial even after we controlled for social desirability bias. Overall, the pattern of results supports the notion of the GFP as a construct that is consistent across different measures and that is closely related to the construct of trait emotional intelligence.
    Keywords: General Factor of Personality ; Big Five ; Giant Three ; Trait Emotional Intelligence ; Psychology
    ISSN: 0191-8869
    E-ISSN: 1873-3549
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  • 7
    Language: English
    In: European Journal of Personality, June 2010, Vol.24(4), pp.356-373
    Description: In this study we report results of a meta‐analysis of studies linking personality to circadian rhythms. A total of 35 independent samples, 96 correlations and 8589 participants were included. Results showed that conscientiousness is the personality dimension that mostly related to morningness ( = .29). Agreeableness was also related to morningness although to a lesser degree ( = .13). Openness to experience, extraversion and neuroticism, contribute to a very small degree (i.e. −.09, −.06 and −.07, respectively). Furthermore, moderation analyses suggested effects of personality measure (big five vs. other) and sample (students vs. workers). Average age of participants had no significant impact on the relationship between morningness and personality, apart from a very trivial influence on openness to experience. Copyright © 2010 John Wiley & Sons, Ltd.
    Keywords: Chronobiology ; Circadian Rhythms ; Five Factor Model ; Morningness–Eveningness ; Personality
    ISSN: 0890-2070
    E-ISSN: 1099-0984
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  • 8
    Language: English
    In: Comprehensive Psychiatry, 2010, Vol.51(4), pp.443-448
    Description: The purpose of the current investigation was (1) to test whether the 3-factor structure of the 20-item Toronto Alexithymia Scale (TAS-20) corresponding to the theoretical conceptualization of the alexithymia construct could be recovered in a Greek translation of the scale (the TAS-20-G), (2) to assess if a 3-factor structure provides a better fit to the TAS-20-G compared with the recently proposed alternative factor structures, and (3) to evaluate the internal reliability of the TAS-20-G. The English version of the TAS-20 was translated into Greek and then back-translated and modified until cross-language equivalence was established. The Greek version was then administered to 340 university students. Confirmatory factor analyses were conducted, and 4 different factor structure models were compared. Internal consistency and item-to-scale homogeneity of the TAS-20-G and its factor scales were also evaluated. The 3-factor model provided a good fit to the data and proved superior to alternative 1-, 2-, and 4-factor models. Apart from a coefficient below the recommended range for the externally oriented thinking factor, the TAS-20-G and its factor scales demonstrated adequate internal consistency and homogeneity. The TAS-20-G is a valid and reliable measure of alexithymia in university students and may be suitable for investigations of alexithymia in other Greek-speaking population samples.
    Keywords: Medicine ; Psychology
    ISSN: 0010-440X
    E-ISSN: 1532-8384
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  • 9
    Language: English
    In: Journal of the American College of Cardiology, 23 October 2012, Vol.60(17), pp.B225-B225
    Description: [...]due to anatomic reasons, this therapy cannot be offered to significant number of patients with these defects.
    Keywords: Medicine
    ISSN: 0735-1097
    E-ISSN: 1558-3597
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  • 10
    Language: English
    In: Annals of Behavioral Medicine, 2014, Vol.47(1), pp.79-91
    Description: Byline: Evangelos C. Karademas (1), Ioannis Tsaousis (1) Keywords: Personality; Illness self-regulation; Cardiovascular disease; Inter-personality interactions; Patients and partners Abstract: Background Little is known about the ways that personality is related to patient health, although there is some evidence that illness self-regulation as well as partner personality play a significant role. Purpose The aim of the two present studies was to examine the intra-personal (i.e., through illness representations) and the inter-personal (i.e., partner) effects of personality on cardiac patients' subjective health. Methods One hundred fifteen patients participated in study 1 75 patients and their spouses participated in study 2. Results The representations of illness consequences, personal control, and the attribution of illness to emotional causes mediated the relation of personality to health (first study). The relations of patients' extraversion, agreeableness, and conscientiousness to their health were statistically significant at the higher levels (+1 SD) of spouse corresponding traits (second study). Conclusion Personality affects patients' health through illness representations (intrapersonal level), as well as by interacting with partner personality (interpersonal level). Author Affiliation: (1) Department of Psychology, University of Crete, 74100, Gallos, Rethymnon, Greece Article History: Registration Date: 06/06/2013 Online Date: 19/06/2013
    Keywords: Personality ; Illness self-regulation ; Cardiovascular disease ; Inter-personality interactions ; Patients and partners
    ISSN: 0883-6612
    E-ISSN: 1532-4796
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