33 results on '"G. Lecocq"'
Search Results
2. [Validation of the French version of the 10-item Big Five Inventory]
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R, Courtois, J-M, Petot, O, Plaisant, B, Allibe, B, Lignier, C, Réveillère, G, Lecocq, and O, John
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Male ,Personality Inventory ,Psychometrics ,Humans ,Reproducibility of Results ,Female ,France ,Personality Disorders ,Language ,Personality - Abstract
Our primary objective was to validate the French version of the BFI-10, an ultra-short ten-item version of the Big Five Inventory (BFI; John et al., 1991), which allows for a reasonably accurate assessment of personality in circumstances in which more in-depth assessment is not possible. In order to reach a thorough evaluation of the external validity, we also aimed to examine the bandwidth of the BFI-10 scales with reference to the study by De Young, Quilty and Peterson (2007) who distinguished between two aspects in each of the Big Five: Assertiveness and Enthusiasm for Extraversion; Compassion and Politeness for Agreeability; Orderliness and Productiveness for Conscientiousness; Withdrawal and Volatility for Negative Emotionality, and finally Openness to Aesthetics and Openness to Ideas for Open-Mindedness. Our concern with regard to bandwidth was to examine whether the BFI-10 scales have strong enough correlations with both aspects of each domain.Participants. Data from four samples were analysed: Sample 1 comprised 2499 undergraduate students (1654 women) who completed the full BFI in university classes; Sample 2 comprised 13,306 participants (8471 women) who filled out the BFI-10 ten items online via Internet; Sample 3 comprised 143 undergraduate students (115 women) who completed the full BFI twice with a two-week interval; Sample 4 comprised 360 undergraduate students (183 women) who filled out the BFI and NEO PI-R.The French version of the Big Five Inventory is a 45-item inventory, which measures the five broader domains of personality. The ultrashort Ten-item Big Five Inventory (BFI-10) was developed simultaneously in German and English by Rammstedt and John (2007); it comprises five two-item scales measuring the big five domains. The Neuroticism-Extraversion-Openness Personality Inventory Revised (NEO PI-R; Costa et McCrae, 1992) is a 240-item questionnaire which assesses the big five domains and 30 lower-order facets, i.e. six facets per domain.Factor structure and reliability of the five two-item scales were first investigated on samples 1 and 3. Confirmatory factor analyses (CFAs) were conducted on samples 1 and 2, and discriminant validity was assessed via comparison with the NEO PI-R (sample 4). In order to examine the bandwidth of the BFI-10 two-item scales, we studied their correlation not only with the NEO PI-R domains but also with the 30 facets.The CFAs showed the good fit of the five-factor structure, with RMSEA=.077 (.072), CFI=.974 (.956), and SRMR=.029 (.027) in samples 1 and 2 respectively. Multigroup CFA conducted in groups 1 and 2 showed invariance across gender of factor loadings and item intercepts. Test-retest reliability was satisfactory with rs ranging from .68 (Open-Mindedness) to .86 (Extraversion and Negative Emotionality). The comparison of the two-item scales with the NEO PI-R scales showed high correlations not only with the NEO domain scales, but also with several facets: Four BFI-10 two-item scales (Extraversion, Conscientiousness, Negative Emotionality, and Open-Mindedness) were highly correlated with at least three of the six NEO facet scales in each domain. For Agreeableness, the magnitude of correlations was smaller, but the pattern of correlations was the same. All BFI-10 scales had at least moderate correlations with both aspects of each domain, with the exception of Negative Emotionality, which measured the NEO Withdrawal aspect better than Volatility.The French version of the BFI-10 demonstrated the expected five-factor structure, satisfactory reliability, and broad bandwidth. It could be a valuable tool for the assessment of personality in circumstances in which it is not possible to use a longer and more in-depth instrument, especially when personality is not the main focus of research but one of the variables to be controlled.
- Published
- 2020
3. Les caméras intra-orales : choix et intégration au cabinet
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G. Lecocq
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03 medical and health sciences ,0302 clinical medicine ,030228 respiratory system ,General Engineering ,General Earth and Planetary Sciences ,030206 dentistry ,General Environmental Science - Abstract
L'acquisition d'un scanner intra-oral est une revolu- tion dans un cabinet orthodontique car le flux numerique genere modifie l'organisation et redefinit totalement les interactions avec nos patients, confreres et prothesistes. La technologie et le mode de fonctionnement sont essentiels a apprehender afin de faire le bon choix de materiel.
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- 2016
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4. [Does the French Big Five Inventory evaluate facets other than the Big Five factors?]
- Author
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R, Courtois, J-M, Petot, B, Lignier, G, Lecocq, and O, Plaisant
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Adult ,Male ,Adolescent ,Neurotic Disorders ,Personality Inventory ,Psychometrics ,Universities ,Depression ,Emotions ,Reproducibility of Results ,Middle Aged ,Young Adult ,Humans ,Female ,France ,Self Report ,Factor Analysis, Statistical ,Students - Abstract
The Big Five Inventory (BFI) developed by John et al. (1991) is one of the most widely accepted tools for assessing dimensions of personality. It comprises 44 items that assess five broad dimensions of personality (the Big Five Factors): Extraversion, Agreeableness, Conscientiousness, Neuroticism and Openness to experience. Based on correlations with the facets described in the NEO Personality Inventory Revised (NEO PI-R), another Big Five assessment tool with 240 items and 6 facets per dimension, Soto and John (2009) showed that the dimensions in the BFI could be divided into two facets each (ten facets altogether). These results are in line with those of DeYoung et al. (2007), who ran factorial analyses with all the NEO PI-R facets and the International Personality Item Pool (IPIP) and identified ten intermediate factors (between facets and dimensions) which they called "aspects" (two per dimension). The goal of the present study is to investigate the ten facets described by Soto and John in a French sample, using the French version of the BFI (BFI-Fr), which has good psychometric properties, and to check whether the pattern of correlations of these facets with the NEO PI-R match those of the American version.We created three groups. The first comprised 360 students from the Institut libre d'éducation physique supérieure (ILEPS) and Tours University (psychology undergraduates). Participants (mean age 21.1 years±2.30; 58% women) completed the BFI-Fr and the NEO PI-R. The second comprised 142 psychology students from Tours University (mean age 20.6 years±1.78; 81% women); they completed the BFI-Fr twice, two weeks apart (test and retest). The third comprised 252 psychology students from Paris-Nanterre University (mean age 23 years±4.2; 89% women) who described a total of 405 people they knew well (mean age 35.2±10.8; 49% women) using the peer-report format of the BFI-Fr.In the self-report format, eight of Soto and John's ten aspects had acceptable internal consistency (based on Guildford's (1954) internal consistency criteria, due to the small number of items), with Cronbach's α between 0.60 and 0.86 and test-retest correlations between 0.71 and 0.89, showing satisfactory temporal stability. We found a single facet for Extraversion (Assertiveness), two for Agreeableness (Altruism and Compliance), two for Conscientiousness (Self-Discipline and Order), one for Neuroticism (Anxiety), and two for Openness to Experience (Openness to aesthetics and Openness to ideas). Based on their convergence with the corresponding facets in the NEO PI-R, these eight facets showed satisfactory external validity. With regard to the peer-report format, the Activity facet of Extraversion, which did not have sufficient internal consistency in the self-report format, had acceptable properties (i.e. 9 out of 10 facets). Only the Depression facet of Neuroticism still had insufficient internal consistency. In this study, we proposed an improvement of two facets (Activity and Compliance) and added one facet specific to the French version (Emotional Instability) in place of the Depression facet.We showed that the BFI-Fr can be used to assess nine of the ten facets described by Soto and John. We also identified an Emotional Instability facet, replacing the Depression facet of Neuroticism. DeYoung et al. (2007) considered that anxiety and depression are indissociable and can be represented by a Neuroticism aspect they labeled Withdrawal. They suggested a second aspect of this dimension they called Volatility (with the N2 Angry Hostility facet of the NEO PI-R as main marker and the N5 Impulsiveness and N3 Depression as secondary markers). The Emotional Instability facet we found corresponds closely to the N2 Angry Hostility facet of the NEO PI-R and appears to be a satisfactory marker of DeYoung et al.'s (2007) Volatility aspect. Although this study has limitations, particularly related to the samples (students), the BFI-Fr facets (derived from those defined by Soto and John in the BFI or proposed as improvements on the original facets) match the corresponding NEO PI-R facets and can also be seen as main markers of the aspects defined by DeYoung et al.
- Published
- 2016
5. Abus sexuel et inaptitude à l’éducation physique et sportive
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Robert Courtois, S Mangeney-Hirsch, E Porcheron, G Lecocq, E Rusch, Psychologie des âges de la vie et adaptation (PAVeA), Université de Tours, Clinique Psychiatrique Universitaire [Tours], Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), Centre Hospitalier Régional Universitaire de Tours (CHRU TOURS), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), and Université de Tours (UT)
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03 medical and health sciences ,Psychiatry and Mental health ,0302 clinical medicine ,Arts and Humanities (miscellaneous) ,[SDV.MHEP.PSM]Life Sciences [q-bio]/Human health and pathology/Psychiatrics and mental health ,05 social sciences ,[SHS.PSY]Humanities and Social Sciences/Psychology ,0501 psychology and cognitive sciences ,030229 sport sciences ,ComputingMilieux_MISCELLANEOUS ,Applied Psychology ,050104 developmental & child psychology - Abstract
Resume L’objectif de cette etude est d’explorer un lien entre un vecu d’abus sexuel et une situation d’inaptitude a l’education physique et sportive ( eps ), appelee communement « dispense de sport ». Population Nous avons interviewe 361 adolescents de classe de seconde de deux lycees d’enseignement general ou des eleves de niveau equivalent (premiere annee de bep ) d’un lycee d’enseignement professionnel de Tours (France) : soit 43 % de garcons, n = 151 et 57 % de filles, n = 204 ; âge moyen 16,58 ans, ET 0,87 an et etendue 4,67 ans. Materiel Des questions exploraient un vecu anterieur d’abus sexuel (attouchements [1] ou sexualite forcee [2]) et le fait d’avoir deja beneficie au cours de sa scolarite d’un certificat d’inaptitude a l’ eps : (a) a l’annee, (b) de plus de trois mois, (c) pour des durees breves, mais repetees et representant au total plus de trois mois et (d) le fait d’etre parfois absent du cours sans raison valable. Ces questions etaient completees par des echelles sur la sante psychique (General Health Questionnaire, Goldberg 1972), l’estime de Soi (Rosenberg’s Self-Esteem Scale, Rosenberg 1965) et le niveau d’ideation suicidaire (Suicidal Ideation Questionnaire, Reynolds 1987). Procedure En avril 2004 en classe (anonymat garanti et participation basee sur le volontariat). Resultats La prevalence des abus sexuels parmi ceux qui ont beneficie d’une inaptitude a l’ eps est importante. Le vecu d’attouchements (1) parmi (a) les inaptitudes annuelles concerne 10,8 % des filles (n = 3) ; (b) 32,1 % (n = 9) pour les inaptitudes de plus de trois mois et (c) 50 % (n = 28) pour celles cumulees. Le seul garcon concerne n’a beneficie d’aucun certificat d’inaptitude. Le vecu d’une sexualite forcee (2) concerne respectivement (a) 16,7 % des filles (n = 2), (b) 41,7 % (n = 5) et (c) 50 % (n = 6). Tandis qu’un des deux garcons concerne a beneficie de toutes les formes de certificat d’inaptitude. Ces resultats sont confirmes par une analyse de variance. Pour les adolescentes, nous ne retrouvons un effet significatif que sur les inaptitudes de courte duree et cumulees (superieures a trois mois d’arret) pour le vecu de violences sexuelles, ou de rapport sexuel force. Pour les garcons, il existe une influence de la sexualite contrainte sur les inaptitudes annuelles. Une recherche de correlations complete cette approche. On retrouve un lien entre inaptitudes cumulees (superieures trois mois) et un vecu d’attouchements, et de relations sexuelles contraintes. Il existe egalement une relation significative entre les inaptitudes superieures a trois mois et les relations sexuelles forcees, et des liens entre l’absenteisme au cours d’ eps et les deux situations d’abus. Ces resultats ont ete completes par l’etude des relations entre ce vecu d’abus sexuel et les variables psychologiques : les filles concernees presentent une plus grande morbidite psychique, une moins bonne estime d’elles-memes et davantage d’ideations suicidaires. Discussion Cette etude montre l’existence d’un lien entre inaptitude a l’ eps et vecu d’abus sexuel. L’expression de la souffrance psychique au travers d’une demande de certificat pour inaptitude a l’ eps est moins reperable que des conduites a risque « bruyantes ». Par consequent, toute demande d’inaptitude a l’ eps de longue duree (annuelle ou de plus de trois mois) doit attirer l’attention des professionnels. Celles de courte duree et qui se repetent doivent faire l’objet d’une vigilance accrue, puisqu’elles ne sont pas controlees par le medecin scolaire. Ces situations d’inaptitudes ne peuvent etre systematiquement rapprochees d’un vecu d’abus sexuel, mais elles sont une bonne occasion d’evaluer la sante psychique de l’adolescent, la qualite de son soutien social et du fonctionnement familial. Cette recherche apporte des premiers constats qu’il s’agira de completer par des travaux ulterieurs.
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- 2008
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6. Les déterminants psychologiques de la blessure physique du sportif: une revue de littérature
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G. Lecocq, Y. Stephan, C. Le Scanff, and Thomas Deroche
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General Psychology - Abstract
Resume Cette revue de litterature a pour objectif de presenter les travaux realises sur les determinants psychologiques de la blessure physique dans le contexte sportif. Ceux-ci mettent majoritairement en evidence le role du stress dans la survenue de blessures. D'autres recherches menees en psychologie de la sante peuvent toutefois initier des reflexions complementaires en caracterisant d'autres processus susceptibles de conduire le sportif a se blesser. Au-dela des dysfonctionnements resultant du vecu d'un episode de stress, certaines approches mettent notamment l'accent sur l'influence pathogene de l'adoption volontaire de comportements a risque ou l'influence salutogene de l'engagement dans des comportements de protection, et sur les determinants lies a l'adoption de ces comportements. Peu d'etudes cependant ont cherche a demontrer la pertinence de ces determinants dans l'identification des sportifs susceptibles de se blesser. Un modele est suggere afin d'engager les recherches selon cette perspective.
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- 2007
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7. L'hypercondylie : apport de la scintigraphie du diagnostic au traitement
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A. Doual-Bisser, J. Ferri, and G. Lecocq
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General Medicine - Abstract
L'hypercondylie est une pathologie autonome se caracterisant par un defaut du controle de la croissance lie tres probablement a un dereglement des boucles de retro-action entre les differentes couches histologiques, qui induirait une persistance de la multiplication des cellules prechondroblastiques.Cliniquement, elle se caracterise par une face asymetrique disgracieuse typique, avec une anatomie mandibulaire, une occlusion perturbees et un plan d'occlusion bascule. Cependant, la forme clinique presentee par les jeunes patients de nos cabinets est souvent naissante, et les signes restent frustes : il est donc tres difficile de diagnostiquer l'hypercondylie. Or, en l'absence de diagnostic, cette pathologie conduit ineluctablement a l'echec therapeutique lorsqu'elle est evolutive.La scintigraphie est une excellente methode d'investigation de l'activite osseuse permettant d'apprehender la croissance et l'activite du cartilage condylien. Ainsi, elle permet de preciser la nature active ou inactive de la pathologie et, de ce fait, de modifier le plan de traitement. Alors, une prise en charge plus precoce est possible et permet de limiter l'acte chirurgical a une condylectomie associee imperativement a un traitement orthodontique pour parfaire le resultat esthetique et fonctionnel.
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- 2005
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8. NEW KNOWLEDGES ON THE CHESTNUT MOSAIC VIRUS DISEASE
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G. Lecocq and J.C. Desvignes
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Mosaic virus ,Disease ,Horticulture ,Biology ,Virology - Published
- 1995
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9. Intraoral digital scanner: selection and integration in clinics
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G. Lecocq
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medicine.medical_specialty ,Scanner ,Intraoral scanner ,Workflow ,Computer science ,medicine ,Medical physics ,Laboratory technicians ,Selection (genetic algorithm) - Abstract
Acquisition of an intraoral scanner leads to an in-office revolution. Indeed, the digital workflow causes organizational changes and deeply modifies the relationship with the patients, other practitioners, and laboratory technicians. That is the reason why practitioners need to understand intraoral scanner technology and operating processes to make a convenient choice.
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- 2016
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10. Total synthesis of fully tritiated leu-enkephalin by enzymatic coupling
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F. Hellio, G. Lecocq, Paul Gueguen, and Jean-Louis Morgat
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chemistry.chemical_classification ,biology ,Enkephalin ,Stereochemistry ,Organic Chemistry ,Saccharomyces cerevisiae ,Radiochemistry ,Total synthesis ,Leu-enkephalin ,biology.organism_classification ,Biochemistry ,Analytical Chemistry ,chemistry.chemical_compound ,Residue (chemistry) ,Enzyme ,chemistry ,Drug Discovery ,Mole ,Radiology, Nuclear Medicine and imaging ,Tritium ,Spectroscopy - Abstract
This paper describes the total enzymatic synthesis of Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) in which all residues were labelled with tritium. Carboxypeptidase Y from Saccharomyces cerevisiae was the coupling enzyme. [3H]-Tyr-NH2, [3H]-Gly-Oet, [3H]-Phe-NH2 and [3H]-Leu-NH2 were prepared with specific radioactivities ranging between 20 and 60 Ci/mmol (740 to 2220 GBq/mmol). Using a microscale procedure, we obtained a fully tritiated hormone having a specific radioactivity equal to 139 Ci/mmol (5143 GBq/mmol), in agreement with the summation of the specific radioactivities of constituting residue. The radioactive hormone had antigenic properties identical to those of native Leu-enkephalin. It also bound to rat brain opiate receptors like the parental hormone.
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- 1990
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11. The B cell transcriptional coactivator BOB1/OBF1 gene fuses to the LAZ3/BCL6 gene by t(3;11)(q27;q23.1) chromosomal translocation in a B cell leukemia line (Karpas 231)
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S, Galiègue Zouitina, S, Quief, M P, Hildebrand, C, Denis, G, Lecocq, M, Collyn-d'Hooghe, C, Bastard, M, Yuille, M J, Dyer, and J P, Kerckaert
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DNA, Complementary ,Molecular Sequence Data ,Restriction Mapping ,Gene Expression ,Regulatory Sequences, Nucleic Acid ,Polymerase Chain Reaction ,Translocation, Genetic ,Cell Line ,Proto-Oncogene Proteins ,Leukemia, B-Cell ,Tumor Cells, Cultured ,Humans ,Amino Acid Sequence ,Cloning, Molecular ,DNA Primers ,Base Sequence ,Genes, Immunoglobulin ,Chromosomes, Human, Pair 11 ,Chromosome Mapping ,Zinc Fingers ,Exons ,Introns ,DNA-Binding Proteins ,Proto-Oncogene Proteins c-bcl-6 ,Trans-Activators ,Chromosomes, Human, Pair 3 ,Transcription Factors - Abstract
The LAZ3/BCL6 gene on chromosone 3q27 is recurrently disrupted in B cell non-Hodgkin's lymphomas by translocations involving immunoglobulin genes or other chromosone regions. We have cloned the breakpoint region and chromosone derivatives of the t(3;11)(q27;q23.1) translocation, present in a B cell leukemia cell line (Karpas 231), which define a novel 11q23.1 breakpoint site. As a consequence of the translocation, LAZ3 regulatory regions upstream of non-coding exon 2 are replaced by those of BOB1/OBF1, a recently described B cell-specific coactivator of octamer-binding transcription factors. A detailed structural study of the BOB1/OBF1 genomic DNA and of a nearly full-length cDNA revealed particular features in the 3' untranslated region, such as an Alu motif and a polymorphic tetranucleotide microsatellite. Two mutations leading to two potential amino acid changes in the C-terminal region, were also detected in one allele of a lymphoma B cell line, Raji. Due to its cell-specific expression and role as a coactivating transcription factor, chromosomal translocation and/or point mutation of BOB1/OBF1 may contribute to B cell tumorigenesis.
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- 1996
12. Fusion of the LAZ3/BCL6 and BOB1/OBF1 genes by t(3; 11) (q27; q23) chromosomal translocation
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S, Galiègue-Zouitina, S, Quief, M P, Hildebrand, C, Denis, G, Lecocq, M, Collyn-d'Hooghe, C, Bastard, M, Yuille, M J, Dyer, and J P, Kerckaert
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Base Sequence ,Chromosomes, Human, Pair 11 ,Molecular Sequence Data ,Tumor Cells, Cultured ,Humans ,Amino Acid Sequence ,Chromosomes, Human, Pair 3 ,Oncogenes ,Cloning, Molecular ,Translocation, Genetic ,Cell Line, Transformed ,Transcription Factors - Abstract
The LAZ3/BCL6 gene on chromosome 3q27 is recurrently disrupted in B-cell non Hodgkin's lymphomas by translocations involving immunoglobulin genes or other chromosome regions. We have studied the t(3; 11) (q27; q23) translocation, present in a B-cell leukemia cell line (Karpas 231). As a consequence of this translocation, a LAZ3 chimeric transcript was created by fusion, 5' to the LAZ3 exon 2, with a transcribed sequence identical to BOB1/OBF1, a B cell-specific coactivator of octamer-binding transcription factors, recently described. Nucleotidic sequence of a nearly full-length cDNA of the BOB1/OBF1 gene revealed particular features in the 3' untranslated region of the gene, including pyrimidine-rich sequence repeats, an Alu motif, and a polymorphic [CCTT] tetranucleotide microsatellite. Two A to G transition mutations were also detected in the coding region of one allele of a lymphoma B-cell line, Raji, leading to 2 amino-acid changes in the C-terminal region. Due to its cell-specificity and role as a coactivating transcription factor, chromosomal translocation and/or perhaps point mutation of BOB1/OBF1 may contribute to B cell tumorigenesis.
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- 1995
13. Preparation D'Osyl-Phosphates Marques au14C, 2) Preparation de L′ϕ-D-Galactose-1-Phosphate [U-14C] par une Galactokinase Vegetale
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M. J. Foglietti, O. Trémeau, F. Percheron, and G. Lecocq
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Chemistry ,Stereochemistry ,Organic Chemistry ,Drug Discovery ,Radiology, Nuclear Medicine and imaging ,General Medicine ,Biochemistry ,Spectroscopy ,Analytical Chemistry - Published
- 1974
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14. Blind-prediction: Estimating the consequences of vented hydrogen deflagrations for homogeneous mixtures in 20-foot ISO containers
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T. Skjold, H. Hisken, S. Lakshmipathy, G. Atanga, M. Carcassi, M. Schiavetti, J.R. Stewart, A. Newton, J.R. Hoyes, I.C. Tolias, A.G. Venetsanos, O.R. Hansen, J. Geng, A. Huser, S. Helland, R. Jambut, K. Ren, A. Kotchourko, T. Jordan, J. Daubech, G. Lecocq, A.G. Hanssen, C. Kumar, L. Krumenacker, S. Jallais, D. Miller, C.R. Bauwens, Civs, Gestionnaire, CARCASSI, Marco, JORDAN, Thomas, Gexcon AS, University of Pisa - Università di Pisa, Health and Safety Executive, National Centre for Scientific Research Demokritos, Det Norske Veritas, DNV GL, Karlsruhe Institute of Technology (KIT), Institut National de l'Environnement Industriel et des Risques (INERIS), Fluidyn, parent, Air Liquide [Siège Social], and FM Global Research, Research Division, Norwood, MA, United States
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Vented hydrogen deflagrations ,STRUCTURAL RESPONSE ,[SDE.IE]Environmental Sciences/Environmental Engineering ,Renewable Energy, Sustainability and the Environment ,05 social sciences ,Energy Engineering and Power Technology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,VENTED DEFLAGRATIONS ,7. Clean energy ,Containers ,Fuel Technology ,BLIND-PREDICTION ,13. Climate action ,20-foot containers ,Blind-prediction ,Consequence modelling ,Hydrogen safety ,Structural response ,Vented deflagrations ,20-FOOT CONTAINERS ,0502 economics and business ,Homogeneous mixtures ,CONSEQUENCE MODELLING ,HYDROGEN SAFETY ,[SDE.IE] Environmental Sciences/Environmental Engineering ,050207 economics ,0210 nano-technology - Abstract
This paper was presented at the Seventh International Conference of Hydrogen Safety (ICHS 2017) in Hamburg on 11-13 September 2017. The paper summarises the results from a blind-prediction study for models developed for estimating the consequences of vented hydrogen deflagrations. The work is part of the project Improving hydrogen safety for energy applications through pre-normative research on vented deflagrations (HySEA). The scenarios selected for the blind-prediction entailed vented explosions with homogeneous hydrogen-air mixtures in a 20-foot ISO container. The test program included two configurations and six experiments, i.e. three repeated tests for each scenario. The comparison between experimental results and model predictions reveals reasonable agreement for some of the models, and significant discrepancies for others. It is foreseen that the first blind-prediction study in the HySEA project will motivate developers to improve their models, and to update guidelines for users of the models. The paper is a deliverable from the project “Improving hydrogen safety for energy applications through pre-normative research on vented deflagrations”, or HySEA (www.hysea.eu), which receives funding from the Fuel Cells and Hydrogen Joint Undertaking (FCH JU) under grant agreement no. 671461. This Joint Undertaking receives support from the European Union’s Horizon 2020 research and innovation programme and United Kingdom, Italy, Belgium and Norway.
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15. [Binding of a tritiated enkephalinergic analog (FK 33-824) to a mitochondrial fraction of rat brain]
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O, Tremeau, G, Faure, J C, Boulain, F, Bouet, A, Menez, G, Lecocq, J L, Morgat, and P, Fromageot
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Kinetics ,Levallorphan ,Morphine ,beta-Endorphin ,D-Ala(2),MePhe(4),Met(0)-ol-enkephalin ,Animals ,Brain ,Endorphins ,Enkephalins ,Mitochondria ,Papio ,Rats - Abstract
FK-33-824 (Try-D-Ala-Gly-MePhe-Met(O)ol) is a potent enkephalin analog which has been tritium labelled with a high specific radioactivity (41 Ci/mmole). The labelled drug exhibits specific and saturable binding to rat brain crude mitochondrial fraction. Specific binding is inhibited by low concentrations of morphine, levallorphan and beta-endorphin, suggesting that FK 33-824 [3H] binds preferentially to mu opiate sites. Binding studies at equilibrium and kinetics of formation and dissociation of the labelled ligand-receptor complex indicate that FK 33-824 [3H] binds to two classes of specific sites. Their affinities are distinguishable at 0 degree (KD = 1.3 and 5.8 nM) and very close to each other at 37 degree (KD = 1.9 nM).
- Published
- 1981
16. In vitro DNA reaction with a carcinogen: the O,O'-diacetyl-4-hydroxyaminoquinoline 1-oxide changes of stability of modified DNA
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S, Galiègue, G, Lecocq, and M H, Loucheux-Lefebvre
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Binding Sites ,Hot Temperature ,Osmolar Concentration ,Aminoquinolines ,Carcinogens ,Animals ,Nucleic Acid Conformation ,DNA ,Nucleic Acid Denaturation ,Chickens - Abstract
The diacetyl derivative of 4-hydroxyaminoquinoline 1-oxide, the proximate carcinogen of 4-nitroquinoline 1-oxide, was reacted in vitro with native and heat denatured chicken erythrocyte DNA under various conditions. The amount of fixed carcinogen was obtained by using the labeled diacetyl derivative and from this result the molar extinction coefficients of bound carcinogen were calculated in order to allow a direct spectrophotometric determination. A decrease in melting temperature of DNA samples modified by O,O'-diacetyl 4-hydroxyaminoquinoline 1-oxide (di Ac-4HAQO) was measured: the melting temperature depression value is equal to 1.4 degrees C per 1% of modified DNA bases. This result was compared with the values previously obtained by Fuchs and coworkers (Fuchs, R. and Daune, M. (1973) FEBS Lett, 34, 295-298 and Fuchs, R. Lefebvre, J.F., Pouyet, J. and Daune, M. (1976) Biochemistry 15, 3347-3351) for N-acetoxy-N-2-acetylaminofluorene-modified DNA and by Lang et al. [25] for the phenanthrylation of the DNA bases of N-acetoxy-N-2-acetylaminophenanthrene-modified DNA.
- Published
- 1980
17. Aligners: review of their chemical components, recycling, mechanical properties and therapeutic needs - Part 1
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Lecocq G
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- Humans, Recycling methods, Polyurethanes chemistry, Orthodontic Wires, Orthodontic Appliance Design, Elastic Modulus, Polyethylene Glycols chemistry, Materials Testing methods, Polyethylene Terephthalates, Tooth Movement Techniques methods, Tooth Movement Techniques instrumentation
- Abstract
Introduction: The aligner is a thermoformed plastic device composed of various chemical components: polyurethane, polyethylene terephthalate glycol, polypropylene… All these plastics must be sufficiently resistant to abrasion and translucent for aesthetic purposes, but their solubility to salivary enzymes, insertion-disinsertion fatigue and recyclability vary according to material. From an orthodontic point of view, they must facilitate tooth movement. However, their behavior differs from that of orthodontic archwires: their Young's modulus, resilience and unloading curve are distinct, resulting in mechanical properties that fall significantly below the orthodontic requirements of multi-bracket systems., Objective: The aim of this article was to review the chemical composition, recycling and mechanical properties of aligners, and to put them into perspective with therapeutic indications., Materials and Methods: Literature data were approximated to orthodontic needs., Results: Neither plastic nor direct printing can match the mechanical properties of our archwires or the procedures of a reliable vestibular multi-attachment appliance., Discussion: Aligners remain an interesting tool in targeted indications.
- Published
- 2024
- Full Text
- View/download PDF
18. The evolution of the Aristolochia pallida complex (Aristolochiaceae) challenges traditional taxonomy and reflects large-scale glacial refugia in the Mediterranean.
- Author
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Krause C, Oelschlägel B, Mahfoud H, Frank D, Lecocq G, Shuka L, Neinhuis C, Vargas P, Tosunoglu A, Thiv M, and Wanke S
- Abstract
The taxonomy of the Mediterranean Aristolochia pallida complex has been under debate since several decades with the following species currently recognized: A . pallida , A . lutea , A . nardiana , A . microstoma , A . merxmuelleri , A . croatica , and A . castellana . These taxa are distributed from Iberia to Turkey. To reconstruct phylogenetic and biogeographic patterns, we employed cpDNA sequence variation using both noncoding (intron and spacer) and protein-coding regions (i.e., trnK intron, matK gene, and trnK - psbA spacer). Our results show that the morphology-based traditional taxonomy was not corroborated by our phylogenetic analyses. Aristolochia pallida , A . lutea , A . nardiana , and A . microstoma were not monophyletic. Instead, strong geographic signals were detected. Two major clades, one exclusively occurring in Greece and a second one of pan-Mediterranean distribution, were found. Several subclades distributed in Greece, NW Turkey, Italy, as well as amphi-Adriatic subclades, and a subgroup of southern France and Spain, were revealed. The distribution areas of these groups are in close vicinity to hypothesized glacial refugia areas in the Mediterranean. According to molecular clock analyses the diversification of this complex started around 3-3.3 my, before the onset of glaciation cycles, and the further evolution of and within major lineages falls into the Pleistocene. Based on these data, we conclude that the Aristolochia pallida alliance survived in different Mediterranean refugia rarely with low, but often with a high potential for range extension, and a high degree of morphological diversity., Competing Interests: The authors declare no conflict of interest., (© 2022 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
- Published
- 2022
- Full Text
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19. [Validation of the French version of the 10-item Big Five Inventory].
- Author
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Courtois R, Petot JM, Plaisant O, Allibe B, Lignier B, Réveillère C, Lecocq G, and John O
- Subjects
- Female, France, Humans, Language, Male, Personality Inventory, Psychometrics, Reproducibility of Results, Personality, Personality Disorders diagnosis
- Abstract
Objective: Our primary objective was to validate the French version of the BFI-10, an ultra-short ten-item version of the Big Five Inventory (BFI; John et al., 1991), which allows for a reasonably accurate assessment of personality in circumstances in which more in-depth assessment is not possible. In order to reach a thorough evaluation of the external validity, we also aimed to examine the bandwidth of the BFI-10 scales with reference to the study by De Young, Quilty and Peterson (2007) who distinguished between two aspects in each of the Big Five: Assertiveness and Enthusiasm for Extraversion; Compassion and Politeness for Agreeability; Orderliness and Productiveness for Conscientiousness; Withdrawal and Volatility for Negative Emotionality, and finally Openness to Aesthetics and Openness to Ideas for Open-Mindedness. Our concern with regard to bandwidth was to examine whether the BFI-10 scales have strong enough correlations with both aspects of each domain., Methods: Participants. Data from four samples were analysed: Sample 1 comprised 2499 undergraduate students (1654 women) who completed the full BFI in university classes; Sample 2 comprised 13,306 participants (8471 women) who filled out the BFI-10 ten items online via Internet; Sample 3 comprised 143 undergraduate students (115 women) who completed the full BFI twice with a two-week interval; Sample 4 comprised 360 undergraduate students (183 women) who filled out the BFI and NEO PI-R., Instruments: The French version of the Big Five Inventory is a 45-item inventory, which measures the five broader domains of personality. The ultrashort Ten-item Big Five Inventory (BFI-10) was developed simultaneously in German and English by Rammstedt and John (2007); it comprises five two-item scales measuring the big five domains. The Neuroticism-Extraversion-Openness Personality Inventory Revised (NEO PI-R; Costa et McCrae, 1992) is a 240-item questionnaire which assesses the big five domains and 30 lower-order facets, i.e. six facets per domain., Statistical Analyses: Factor structure and reliability of the five two-item scales were first investigated on samples 1 and 3. Confirmatory factor analyses (CFAs) were conducted on samples 1 and 2, and discriminant validity was assessed via comparison with the NEO PI-R (sample 4). In order to examine the bandwidth of the BFI-10 two-item scales, we studied their correlation not only with the NEO PI-R domains but also with the 30 facets., Results: The CFAs showed the good fit of the five-factor structure, with RMSEA=.077 (.072), CFI=.974 (.956), and SRMR=.029 (.027) in samples 1 and 2 respectively. Multigroup CFA conducted in groups 1 and 2 showed invariance across gender of factor loadings and item intercepts. Test-retest reliability was satisfactory with rs ranging from .68 (Open-Mindedness) to .86 (Extraversion and Negative Emotionality). The comparison of the two-item scales with the NEO PI-R scales showed high correlations not only with the NEO domain scales, but also with several facets: Four BFI-10 two-item scales (Extraversion, Conscientiousness, Negative Emotionality, and Open-Mindedness) were highly correlated with at least three of the six NEO facet scales in each domain. For Agreeableness, the magnitude of correlations was smaller, but the pattern of correlations was the same. All BFI-10 scales had at least moderate correlations with both aspects of each domain, with the exception of Negative Emotionality, which measured the NEO Withdrawal aspect better than Volatility., Conclusion: The French version of the BFI-10 demonstrated the expected five-factor structure, satisfactory reliability, and broad bandwidth. It could be a valuable tool for the assessment of personality in circumstances in which it is not possible to use a longer and more in-depth instrument, especially when personality is not the main focus of research but one of the variables to be controlled., (Copyright © 2020 L'Encéphale, Paris. Published by Elsevier Masson SAS. All rights reserved.)
- Published
- 2020
- Full Text
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20. [Does the French Big Five Inventory evaluate facets other than the Big Five factors?]
- Author
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Courtois R, Petot JM, Lignier B, Lecocq G, and Plaisant O
- Subjects
- Adolescent, Adult, Depression psychology, Emotions, Factor Analysis, Statistical, Female, France, Humans, Male, Middle Aged, Neurotic Disorders diagnosis, Neurotic Disorders psychology, Psychometrics, Reproducibility of Results, Self Report, Students psychology, Universities, Young Adult, Personality Inventory standards
- Abstract
Introduction: The Big Five Inventory (BFI) developed by John et al. (1991) is one of the most widely accepted tools for assessing dimensions of personality. It comprises 44 items that assess five broad dimensions of personality (the Big Five Factors): Extraversion, Agreeableness, Conscientiousness, Neuroticism and Openness to experience. Based on correlations with the facets described in the NEO Personality Inventory Revised (NEO PI-R), another Big Five assessment tool with 240 items and 6 facets per dimension, Soto and John (2009) showed that the dimensions in the BFI could be divided into two facets each (ten facets altogether). These results are in line with those of DeYoung et al. (2007), who ran factorial analyses with all the NEO PI-R facets and the International Personality Item Pool (IPIP) and identified ten intermediate factors (between facets and dimensions) which they called "aspects" (two per dimension). The goal of the present study is to investigate the ten facets described by Soto and John in a French sample, using the French version of the BFI (BFI-Fr), which has good psychometric properties, and to check whether the pattern of correlations of these facets with the NEO PI-R match those of the American version., Method: We created three groups. The first comprised 360 students from the Institut libre d'éducation physique supérieure (ILEPS) and Tours University (psychology undergraduates). Participants (mean age 21.1 years±2.30; 58% women) completed the BFI-Fr and the NEO PI-R. The second comprised 142 psychology students from Tours University (mean age 20.6 years±1.78; 81% women); they completed the BFI-Fr twice, two weeks apart (test and retest). The third comprised 252 psychology students from Paris-Nanterre University (mean age 23 years±4.2; 89% women) who described a total of 405 people they knew well (mean age 35.2±10.8; 49% women) using the peer-report format of the BFI-Fr., Results: In the self-report format, eight of Soto and John's ten aspects had acceptable internal consistency (based on Guildford's (1954) internal consistency criteria, due to the small number of items), with Cronbach's α between 0.60 and 0.86 and test-retest correlations between 0.71 and 0.89, showing satisfactory temporal stability. We found a single facet for Extraversion (Assertiveness), two for Agreeableness (Altruism and Compliance), two for Conscientiousness (Self-Discipline and Order), one for Neuroticism (Anxiety), and two for Openness to Experience (Openness to aesthetics and Openness to ideas). Based on their convergence with the corresponding facets in the NEO PI-R, these eight facets showed satisfactory external validity. With regard to the peer-report format, the Activity facet of Extraversion, which did not have sufficient internal consistency in the self-report format, had acceptable properties (i.e. 9 out of 10 facets). Only the Depression facet of Neuroticism still had insufficient internal consistency. In this study, we proposed an improvement of two facets (Activity and Compliance) and added one facet specific to the French version (Emotional Instability) in place of the Depression facet., Discussion: We showed that the BFI-Fr can be used to assess nine of the ten facets described by Soto and John. We also identified an Emotional Instability facet, replacing the Depression facet of Neuroticism. DeYoung et al. (2007) considered that anxiety and depression are indissociable and can be represented by a Neuroticism aspect they labeled Withdrawal. They suggested a second aspect of this dimension they called Volatility (with the N2 Angry Hostility facet of the NEO PI-R as main marker and the N5 Impulsiveness and N3 Depression as secondary markers). The Emotional Instability facet we found corresponds closely to the N2 Angry Hostility facet of the NEO PI-R and appears to be a satisfactory marker of DeYoung et al.'s (2007) Volatility aspect. Although this study has limitations, particularly related to the samples (students), the BFI-Fr facets (derived from those defined by Soto and John in the BFI or proposed as improvements on the original facets) match the corresponding NEO PI-R facets and can also be seen as main markers of the aspects defined by DeYoung et al., (Copyright © 2017 L'Encéphale, Paris. Published by Elsevier Masson SAS. All rights reserved.)
- Published
- 2018
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21. Erratum de : Les échecs relatifs au plan de traitement.
- Author
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Lecocq G
- Published
- 2016
- Full Text
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22. [In Process Citation].
- Author
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Lecocq G
- Published
- 2016
- Full Text
- View/download PDF
23. Digital impression-taking: Fundamentals and benefits in orthodontics.
- Author
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Lecocq G
- Subjects
- Humans, Imaging, Three-Dimensional, Orthodontics instrumentation, Radiography, Dental methods, Dental Impression Technique, Orthodontics methods
- Abstract
The digital era has burst into our offices in a big way. 3D camera technology has improved, enabling us to record our impressions and the occlusion in a digital format file. This file can then be used to make set-ups and manufacture orthodontic devices. Like any new technology, it needs to be studied and understood in order to grasp it fully and master the information and digital flow which can be generated between one's office and any external party involved in treatment, such as laboratories or other colleagues., (Copyright © 2016 CEO. Published by Elsevier Masson SAS. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
24. [Failures regarding the treatment plan].
- Author
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Lecocq G
- Subjects
- Cuspid pathology, Dentist-Patient Relations, Female, Humans, Male, Molar pathology, Orthognathic Surgical Procedures methods, Tooth Extraction methods, Treatment Failure, Malocclusion therapy, Patient Care Planning
- Abstract
Who has never had a treatment failure? Who has never regretted launching into a treatment plan? And who has never vowed to avoid falling again into the same trap? All of us, of course. Which simply allowed us to fall into other traps once we'd pulled ourselves out of our previous failures. And to start with, do we believe that a successful outcome means achieving a molar and canine bilateral Class I, a normal overjet and overbite, and centered and coinciding midlines? So, does that make any other kind of treatment plan a recipe for failure? In more realistic mode, we should consider a treatment plan a failure when we are unable to achieve the objectives we set ourselves at the beginning of treatment, due to a lack of realism, or excessive optimism..., (© EDP Sciences, SFODF, 2016.)
- Published
- 2016
- Full Text
- View/download PDF
25. European College of Orthodontics: commission of affiliation and titularisation.
- Author
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Lecocq G
- Subjects
- Adolescent, Cephalometry methods, Female, Follow-Up Studies, Humans, Orthodontic Brackets, Orthodontic Retainers, Patient Care Planning, Retrognathia therapy, Time Factors, Tooth Movement Techniques instrumentation, Malocclusion, Angle Class II therapy, Overbite therapy
- Abstract
Date of birth: 18/08/1992; sex: female., A Pretreatment Records: (17 y 4 m; 17/12/2009)., Diagnosis: Angle Class II division 2 (deep bite and maxillary lingual incisor tipping) left subdivision with mandibular retrusion in a hypodivergent facial pattern. Teeth missing prior to treatment: none., Treatment Plan: Correction of the Class II, 2 occlusal anomalies. Appliances and devices: bimaxillary lingual multibracket apliances., Treatment Commenced: 17 y 6 m; 16/02/2010., B Post-Treatment Records: 20 y; 9/2012., Duration of Active Treatment: 31 months., End of Treatment: 10/2012., C Postretention Records: (1 year minimum): 21 y 6m ; 3/2014., Duration of Retention: 18 months., (Copyright © 2015 Elsevier Masson SAS. All rights reserved.)
- Published
- 2015
- Full Text
- View/download PDF
26. Smile esthetics: calculated beauty?
- Author
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Lecocq G and Truong Tan Trung L
- Subjects
- Adolescent, Adult, Age Factors, Aging, Art history, Beauty, Cephalometry methods, Child, Cosmetic Techniques, Facial Expression, Female, History, 15th Century, History, Ancient, History, Medieval, Humans, Incisor pathology, Lip pathology, Male, Malocclusion therapy, Orthodontics, Corrective, Patient Satisfaction, Self Concept, Tooth Bleaching methods, Tooth Injuries therapy, Esthetics, Dental, Face anatomy & histology, Smiling
- Abstract
Esthetic demand from patients continues to increase. Consequently, the treatments we offer are moving towards more discreet or invisible techniques using lingual brackets in order to achieve harmonious, balanced results in line with our treatment goals. As orthodontists, we act upon relationships between teeth and bone. And the equilibrium they create impacts the entire face via the smile. A balanced smile is essential to an esthetic outcome and is governed by rules, which guide both the practitioner and patient. A smile can be described in terms of mathematical ratios and proportions but beauty cannot be calculated. For the smile to sit harmoniously within the face, we need to take into account facial proportions and the possibility of their being modified by our orthopedic appliances or by surgery., (Copyright © 2014 CEO. Published by Elsevier Masson SAS. All rights reserved.)
- Published
- 2014
- Full Text
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27. [Screw anchorage appliances].
- Author
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Geyselinck H and Lecocq G
- Subjects
- Bone Screws, Dental Alloys, Miniaturization, Orthodontic Anchorage Procedures instrumentation, Orthodontic Appliances
- Published
- 2009
- Full Text
- View/download PDF
28. The B cell transcriptional coactivator BOB1/OBF1 gene fuses to the LAZ3/BCL6 gene by t(3;11)(q27;q23.1) chromosomal translocation in a B cell leukemia line (Karpas 231).
- Author
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Galiègue Zouitina S, Quief S, Hildebrand MP, Denis C, Lecocq G, Collyn-d'Hooghe M, Bastard C, Yuille M, Dyer MJ, and Kerckaert JP
- Subjects
- Amino Acid Sequence, Base Sequence, Cell Line, Chromosome Mapping, DNA Primers, DNA, Complementary, DNA-Binding Proteins genetics, Exons, Gene Expression, Genes, Immunoglobulin, Humans, Introns, Molecular Sequence Data, Polymerase Chain Reaction, Proto-Oncogene Proteins genetics, Proto-Oncogene Proteins c-bcl-6, Regulatory Sequences, Nucleic Acid, Restriction Mapping, Trans-Activators genetics, Transcription Factors genetics, Tumor Cells, Cultured, Zinc Fingers, Chromosomes, Human, Pair 11, Chromosomes, Human, Pair 3, Cloning, Molecular, DNA-Binding Proteins biosynthesis, Leukemia, B-Cell genetics, Proto-Oncogene Proteins biosynthesis, Trans-Activators biosynthesis, Transcription Factors biosynthesis, Translocation, Genetic
- Abstract
The LAZ3/BCL6 gene on chromosone 3q27 is recurrently disrupted in B cell non-Hodgkin's lymphomas by translocations involving immunoglobulin genes or other chromosone regions. We have cloned the breakpoint region and chromosone derivatives of the t(3;11)(q27;q23.1) translocation, present in a B cell leukemia cell line (Karpas 231), which define a novel 11q23.1 breakpoint site. As a consequence of the translocation, LAZ3 regulatory regions upstream of non-coding exon 2 are replaced by those of BOB1/OBF1, a recently described B cell-specific coactivator of octamer-binding transcription factors. A detailed structural study of the BOB1/OBF1 genomic DNA and of a nearly full-length cDNA revealed particular features in the 3' untranslated region, such as an Alu motif and a polymorphic tetranucleotide microsatellite. Two mutations leading to two potential amino acid changes in the C-terminal region, were also detected in one allele of a lymphoma B cell line, Raji. Due to its cell-specific expression and role as a coactivating transcription factor, chromosomal translocation and/or point mutation of BOB1/OBF1 may contribute to B cell tumorigenesis.
- Published
- 1996
29. Fusion of the LAZ3/BCL6 and BOB1/OBF1 genes by t(3; 11) (q27; q23) chromosomal translocation.
- Author
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Galiègue-Zouitina S, Quief S, Hildebrand MP, Denis C, Lecocq G, Collyn-d'Hooghe M, Bastard C, Yuille M, Dyer MJ, and Kerckaert JP
- Subjects
- Amino Acid Sequence, Base Sequence, Cell Line, Transformed, Cloning, Molecular, Humans, Molecular Sequence Data, Oncogenes genetics, Transcription Factors genetics, Tumor Cells, Cultured, Chromosomes, Human, Pair 11 genetics, Chromosomes, Human, Pair 3 genetics, Translocation, Genetic
- Abstract
The LAZ3/BCL6 gene on chromosome 3q27 is recurrently disrupted in B-cell non Hodgkin's lymphomas by translocations involving immunoglobulin genes or other chromosome regions. We have studied the t(3; 11) (q27; q23) translocation, present in a B-cell leukemia cell line (Karpas 231). As a consequence of this translocation, a LAZ3 chimeric transcript was created by fusion, 5' to the LAZ3 exon 2, with a transcribed sequence identical to BOB1/OBF1, a B cell-specific coactivator of octamer-binding transcription factors, recently described. Nucleotidic sequence of a nearly full-length cDNA of the BOB1/OBF1 gene revealed particular features in the 3' untranslated region of the gene, including pyrimidine-rich sequence repeats, an Alu motif, and a polymorphic [CCTT] tetranucleotide microsatellite. Two A to G transition mutations were also detected in the coding region of one allele of a lymphoma B-cell line, Raji, leading to 2 amino-acid changes in the C-terminal region. Due to its cell-specificity and role as a coactivating transcription factor, chromosomal translocation and/or perhaps point mutation of BOB1/OBF1 may contribute to B cell tumorigenesis.
- Published
- 1995
30. The BTB/POZ domain: a new protein-protein interaction motif common to DNA- and actin-binding proteins.
- Author
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Albagli O, Dhordain P, Deweindt C, Lecocq G, and Leprince D
- Subjects
- Amino Acid Sequence, Animals, Chromatin metabolism, Drosophila, Molecular Sequence Data, Sequence Homology, Amino Acid, Structure-Activity Relationship, DNA-Binding Proteins metabolism, Microfilament Proteins metabolism, Nuclear Proteins metabolism, Protein Structure, Tertiary, Viral Proteins metabolism, Zinc Fingers
- Abstract
The BTB/POZ domain defines a newly characterized protein-protein interaction interface. It is highly conserved throughout metazoan evolution and generally found at the NH2 terminus of either actin-binding or, more commonly, nuclear DNA-binding proteins. By mediating protein binding in large aggregates, the BTB/POZ domain serves to organize higher order macromolecular complexes involved in ring canal formation or chromatin folding.
- Published
- 1995
31. LAZ3, a novel zinc-finger encoding gene, is disrupted by recurring chromosome 3q27 translocations in human lymphomas.
- Author
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Kerckaert JP, Deweindt C, Tilly H, Quief S, Lecocq G, and Bastard C
- Subjects
- Amino Acid Sequence, Animals, Base Sequence, Chromosomes, Human, Pair 14 ultrastructure, Chromosomes, Human, Pair 4 ultrastructure, Drosophila melanogaster genetics, Genes, Immunoglobulin, Genes, Insect, Humans, Molecular Sequence Data, Proto-Oncogene Proteins c-bcl-6, Sequence Alignment, Sequence Homology, Amino Acid, Transcription Factors genetics, Chromosomes, Human, Pair 3 ultrastructure, DNA-Binding Proteins genetics, Genes, Lymphoma, Non-Hodgkin genetics, Translocation, Genetic, Zinc Fingers genetics
- Abstract
We have shown previously that chromosomal translocations involving chromosome 3q27 and immunoglobulin gene regions are the third most common specific translocations in non-Hodgkin's lymphoma (NHL). We now report the isolation of a gene that is disrupted in two cases by t(3;14) and t(3;4) translocations. The gene (LAZ3) encodes a 79 kDa protein containing six zinc-finger motifs and sharing amino-terminal homology with several transcription factors including the Drosophila tramtrack and Broad-complex genes, both of which are developmental transcription regulators. LAZ3 is transcribed as a 3.8 kb message predominantly in normal adult skeletal muscle and in several NHL carrying 3q27 chromosomal defects. We suggest that it may act as a transcription regulator and play an important role in lymphomagenesis.
- Published
- 1993
- Full Text
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32. [Binding of a tritiated enkephalinergic analog (FK 33-824) to a mitochondrial fraction of rat brain].
- Author
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Tremeau O, Faure G, Boulain JC, Bouet F, Menez A, Lecocq G, Morgat JL, and Fromageot P
- Subjects
- Animals, D-Ala(2),MePhe(4),Met(0)-ol-enkephalin, Endorphins pharmacology, Kinetics, Levallorphan pharmacology, Morphine pharmacology, Papio, Rats, beta-Endorphin, Brain metabolism, Endorphins metabolism, Enkephalins metabolism, Mitochondria metabolism
- Abstract
FK-33-824 (Try-D-Ala-Gly-MePhe-Met(O)ol) is a potent enkephalin analog which has been tritium labelled with a high specific radioactivity (41 Ci/mmole). The labelled drug exhibits specific and saturable binding to rat brain crude mitochondrial fraction. Specific binding is inhibited by low concentrations of morphine, levallorphan and beta-endorphin, suggesting that FK 33-824 [3H] binds preferentially to mu opiate sites. Binding studies at equilibrium and kinetics of formation and dissociation of the labelled ligand-receptor complex indicate that FK 33-824 [3H] binds to two classes of specific sites. Their affinities are distinguishable at 0 degree (KD = 1.3 and 5.8 nM) and very close to each other at 37 degree (KD = 1.9 nM).
- Published
- 1981
- Full Text
- View/download PDF
33. In vitro DNA reaction with a carcinogen: the O,O'-diacetyl-4-hydroxyaminoquinoline 1-oxide changes of stability of modified DNA.
- Author
-
Galiègue S, Lecocq G, and Loucheux-Lefebvre MH
- Subjects
- Animals, Binding Sites, Chickens, Hot Temperature, Nucleic Acid Conformation, Nucleic Acid Denaturation, Osmolar Concentration, Aminoquinolines, Carcinogens, DNA
- Abstract
The diacetyl derivative of 4-hydroxyaminoquinoline 1-oxide, the proximate carcinogen of 4-nitroquinoline 1-oxide, was reacted in vitro with native and heat denatured chicken erythrocyte DNA under various conditions. The amount of fixed carcinogen was obtained by using the labeled diacetyl derivative and from this result the molar extinction coefficients of bound carcinogen were calculated in order to allow a direct spectrophotometric determination. A decrease in melting temperature of DNA samples modified by O,O'-diacetyl 4-hydroxyaminoquinoline 1-oxide (di Ac-4HAQO) was measured: the melting temperature depression value is equal to 1.4 degrees C per 1% of modified DNA bases. This result was compared with the values previously obtained by Fuchs and coworkers (Fuchs, R. and Daune, M. (1973) FEBS Lett, 34, 295-298 and Fuchs, R. Lefebvre, J.F., Pouyet, J. and Daune, M. (1976) Biochemistry 15, 3347-3351) for N-acetoxy-N-2-acetylaminofluorene-modified DNA and by Lang et al. [25] for the phenanthrylation of the DNA bases of N-acetoxy-N-2-acetylaminophenanthrene-modified DNA.
- Published
- 1980
- Full Text
- View/download PDF
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