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Search Results: 1 - 10 of 628 matches for " Anastasios; Papadimitriou "
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Determinants of menarche
Olga Karapanou, Anastasios Papadimitriou
Reproductive Biology and Endocrinology , 2010, DOI: 10.1186/1477-7827-8-115
Abstract: The landmarks of the pubertal events in girls are the onset of puberty, peak height velocity (PHV) and menarche. The onset of puberty is marked by the development of breast tissue, while PHV is the highest velocity that is observed during the pubertal growth spurt.Menarche is a rather late event in puberty and usually occurs 6 months after PHV is achieved. The age that menarche occurs varies and is dependent on the interaction between genetic and environmental factors.In the 19th century factors that were thought to exert an influence on the physical maturation of girls were climate (particularly the mean annual temperature), ethnic origin, social status, urban or rural residence, physical activity, education, sexual stimulation, housing, inheritance, and health status [1]. Studies carried out in the 20th century documented other factors associated with the age at menarche, e.g. season and month at birth, physique, position at the sibship, family income, occupation and education of parents and family size [1].It is considered that during the 20th century the dramatic improvement of socioeconomic conditions and general health of the populations in the industrialized countries resulted in an earlier onset of puberty in children. The most reliable marker of the positive secular changes in pubertal development was the fall of the age at menarche. It has been estimated that during most of the 20th century age at menarche has been falling by about 3 months per decade [2], although there are reports from industrialized countries that it has been leveling off or that it shows an upward trend [3,4].Whatever the factors that influence pubertal maturation and age at menarche are, they interrelate and thus the onset of menarche cannot be attributed to a single factor.Aim of this report is to review the neuroendocrinology of pubertal onset and the factors, genetic and environmental, that influence menarcheal age, and also the implications of early or late menarcheal age on a you
Conformally Coupled Scalars, Instantons and Vacuum Instability in AdS_4
Sebastian de Haro,Ioannis Papadimitriou,Anastasios C. Petkou
Physics , 2006, DOI: 10.1103/PhysRevLett.98.231601
Abstract: We show that a scalar field conformally coupled to AdS gravity in four dimensions with a quartic self-interaction can be embedded into M-theory. The holographic effective potential is exactly calculated, allowing us to study non-perturbatively the stability of AdS_4 in the presence of the conformally coupled scalar. It is shown that there exists a one-parameter family of conformal scalar boundary conditions for which the boundary theory has an unstable vacuum. In this case, the bulk theory has instanton solutions that mediate the decay of the AdS_4 space. These results match nicely with the vacuum structure and the existence of instantons in an effective three-dimensional boundary model.
Holographic Hall conductivities from dyonic backgrounds
E. J. Lindgren,Ioannis Papadimitriou,Anastasios Taliotis,Joris Vanhoof
Physics , 2015,
Abstract: We develop a general framework for computing the holographic 2-point functions and the corresponding conductivities in asymptotically locally AdS backgrounds with an electric charge density, a constant magentic field, and possibly non-trivial scalar profiles, for a broad class of Einstein-Maxwell-Axion-Dilaton theories, including certain Chern-Simons terms. Holographic renormalization is carried out for any theory in this class and the computation of the renormalized AC conductivities at zero spatial momentum is reduced to solving a single decoupled first order Riccati equation. Moreover, we develop a first order fake supergravity formulalism for dyonic renormalization group flows in four dimensions, allowing us to construct analytically infinite families of such backgrounds by specifying a superpotential at will. These RG flows interpolate between AdS$_4$ in the UV and a hyperscaling violating Lifshitz geometry in the IR with exponents $1
Quantifying Dynamical Complexity of Magnetic Storms and Solar Flares via Nonextensive Tsallis Entropy
Georgios Balasis,Ioannis A. Daglis,Constantinos Papadimitriou,Anastasios Anastasiadis,Ingmar Sandberg,Konstantinos Eftaxias
Entropy , 2011, DOI: 10.3390/e13101865
Abstract: Over the last couple of decades nonextensive Tsallis entropy has shown remarkable applicability to describe nonequilibrium physical systems with large variability and multifractal structure. Herein, we review recent results from the application of Tsallis statistical mechanics to the detection of dynamical changes related with the occurrence of magnetic storms. We extend our review to describe attempts to approach the dynamics of magnetic storms and solar flares by means of universality through Tsallis statistics. We also include a discussion of possible implications on space weather forecasting efforts arising from the verification of Tsallis entropy in the complex system of the magnetosphere.
Aims, methods and preliminary findings of the Physical Activity, Nutrition and Allergies in Children Examined in Athens (PANACEA) epidemiological study
Kostas N Priftis, Demosthenes B Panagiotakos, Michael B Anthracopoulos, Anastasios Papadimitriou, Polyxeni Nicolaidou
BMC Public Health , 2007, DOI: 10.1186/1471-2458-7-140
Abstract: During 2006, 700 schoolchildren (323 male and 377 female), aged 10–12 years (4th to 6th school grade), were selected from 18 schools located in the greater Athens area. The schools were randomly selected from a list provided by the regional educational offices. To achieve a representative sample the schools enrolled were selected from various region of the Athens area. For each child a questionnaire was completed that was developed for the purposes of the study to retrieve information on: age, sex, school class, other socio-demographic characteristics, anthropometric measurements, dietary habits (through a semi-quantitative Food Frequency Questionnaire) and physical activity status; the presence of asthma and allergies was assessed by the standard ISAAC questionnaire.The prevalence of wheezing in the past was 25% in boys and 19% in girls, while the prevalence of current wheezing was 9.0% in boys and 5.8% in girls. The prevalence of any asthma symptoms was 27.6% in boys and 20.4% in girls. Multiple logistic regression analysis revealed that increased body weight and sedentary lifestyle is associated with asthma symptoms only in boys.The present cross-sectional study cannot establish causal relationships between asthma and increased body weight of schoolchildren; however, our findings underline the associations between asthma, increased body weight, and physical activity at population level, and urge for actions that should be taken by public health policy makers in order to prevent these conditions among children.Asthma is the leading chronic childhood illness throughout the developed world and places a large burden on affected children and their families. Estimates of current asthma prevalence in the USA indicate that 83 per 1000 (i.e. 6.1 million) children aged 0–17 currently have asthma [1]. In Europe the prevalence of asthma is similar to that observed in the US and has increased decades earlier in Western as compared to Eastern Europe. The International Study of
Multiple desmoid tumors in a patient with familial adenomatous polyposis caused by the novel W421X mutation
Ioannidis,Orestis; Paraskevas,George; Chatzopoulos,Stavros; Kotronis,Anastasios; Papadimitriou,Nikolaos; Konstantara,Athina; Makrantonakis,Apostolos; Kakoutis,Emmanouil;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000300009
Abstract: familial adenomatous polyposis (fap) is a rare syndrome characterized by the presence of hundreds to thousands of colorectal adenomas and is responsible for less than 1% of all colorectal cancers. the syndrome is also characterized by extra-colorectal features including amongst others upper gastrointestinal tract polyps and desmoid tumors. the syndrome is inherited by an autosomal dominant gene, the adenomatous polyposis coli (apc) gene. we present the physical history, clinical presentation, diagnosis and treatment of a patient with a novel germline apc mutation, the w421x mutation, which resulted in fap presenting with about a hundred colorectal polyps, gastric hyperplastic polyps and multiple aggressive intra-abdominal and extra-abdominal desmoid tumors.
The effectiveness of the antegrade reamed technique: the experience and complications from 415 traumatic femoral shaft fractures
Efthimios J. Karadimas,George Papadimitriou,Gerasimos Theodoratos,Anastasios Papanikolaou,John Maris
Strategies in Trauma and Limb Reconstruction , 2009, DOI: 10.1007/s11751-009-0071-2
Abstract: This retrospective study presents the experience gained through use of reamed femoral nails and reports results and respective complications. This study included 415 femur fractures (312 men and 101 women with a mean age of 27.8 years) that were treated from 1993 to 2004. The fractures were classified according to AO, and 74 open fractures were included and typed according to the Gustilo classification. Dynamic nailing was performed for nearly all type A fractures and static nailing for types B and C. After a mean follow-up of 1.5 years, union rate was 97.8%. The complications were: 9 non-unions, 14 delayed-unions, 4 torsional malunions, 6 limb length discrepancies (shortening) and 30 nerve pareses due to traction. Deep venous thrombosis (DVT) occurred below the knee in 4 patients, while there were recorded 3 pulmonary and 2 fat embolisms, 1 superficial and 1 deep infection. There were 28 broken screws identified postoperatively. Logistic regression analysis revealed that type B and C were associated with increased risk of complications, with respective odds ratios of 3.1 (95% CI = 1.3–7.2, P = 0.011) and 4.3 (95% CI = 1.8–10.3, P = 0.001) when compared to type A patterns. All patients returned to their activities in a mean time of 10 months. Intramedullary nailing is still the treatment of choice for femoral shaft fractures, but knowledge of potential complications and their association with certain fracture patterns is needed.
Accurately specifying storm-time ULF wave radial diffusion in the radiation belts
Stavros Dimitrakoudis,Ian R. Mann,Georgios Balasis,Constantinos Papadimitriou,Anastasios Anastasiadis,Ioannis A. Daglis
Physics , 2015, DOI: 10.1002/2015GL064707
Abstract: Ultra-low frequency (ULF) waves can contribute to the transport, acceleration and loss of electrons in the radiation belts through inward and outward diffusion. However, the most appropriate parameters to use to specify the ULF wave diffusion rates are unknown. Empirical representations of diffusion coefficients often use Kp; however, specifications using ULF wave power offer an improved physics-based approach. We use 11 years of ground-based magnetometer array measurements to statistically parameterise the ULF wave power with Kp, solar wind speed, solar wind dynamic pressure and Dst. We find Kp is the best single parameter to specify the statistical ULF wave power driving radial diffusion. Significantly, remarkable high energy tails exist in the ULF wave power distributions when expressed as a function of Dst. Two parameter ULF wave power specifications using Dst as well as Kp provide a better statistical representation of storm-time radial diffusion than any single variable alone.
Acute respiratory failure caused by neglected giant substernal nontoxic goiter
Ioannidis, Orestis;Dalampini, Eleftheria;Chatzopoulos, Stavros;Kotronis, Anastasios;Paraskevas, George;Konstantara, Athina;Papadimitriou, Nikolaos;Makrantonakis, Apostolos;Kakoutis, Emmanouil;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2011, DOI: 10.1590/S0004-27302011000300009
Abstract: substernal goiter is usually defined as a goiter in which the thyroid mass has descended the plane of the thoracic inlet or if more than 50% of the thyroid mass is located below the thoracic inlet. substernal goiters may be asymptomatic or may present with symptoms caused by compression of adjacent organs. acute respiratory failure is rare in cases of substernal goiter. in cases of symptomatic substernal goiter the treatment is surgical by thyroidectomy. we present a rare case of a giant substernal nontoxic goiter which caused acute respiratory failure which was treated by urgent thyroidectomy through a t-incision.
Recurrent small intestine intussusception in a patient with Peutz-Jeghers syndrome
Ioannidis,Orestis; Papaemmanouil,Styliani; Paraskevas,George; Kotronis,Anastasios; Chatzopoulos,Stavros; Konstantara,Athina; Papadimitriou,Nikolaos; Makrantonakis,Apostolos; Kakoutis,Emmanouil;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000100009
Abstract: peutz-jeghers syndrome is a rare hereditary autosomal dominant disease caused by a mutation of the tumor suppressor gene serine/threonine kinase 11 located in chromosome 19p13.3. it is characterized by the presence of extensive mucocutaneous pigmentation, especially of the lips and the occurrence of hamartomatous polyps throughout the gastrointestinal tract. gastrointestinal hamartomas occur predominantly in the small intestine and can become symptomatic leading usually to intestinal obstruction and abdominal pain. we present a case of recurrent intestinal obstruction caused by small bowel intussusception treated by reduction, enterotomy and polypectomy and followed by intraoperative enteroscopy and endoscopic polypectomy.
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