Miracle-dz/UniFAR-FTUs huggingface dataset:
Effect of diameter and length on stress distribution of the alveolar crest around immediate loading implants.

BACKGROUND Many clinical observations have shown that immediate loading is indicated when the stabilization of the bone/implant is optimal and when the estimated loads are not excessively high. Nonetheless, more experimental studies are needed to consider the immediate loading protocol as a safe procedure. Mechanical analysis using the finite element (FE) method analysis has been employed by many authors to understand the biomechanical behavior around dental implants. PURPOSE This study was to evaluate the effect of the diameter and length on the stress and strain distribution of the crestal bone around implants under immediate loading. MATERIALS AND METHODS By an ad hoc automatic mesh generator, high-quality FE models of complete range mandible was constructed from computer tomography, with three Straumann (Straumann Institute, Waldenburg, Switzerland) implants of various sizes embedded in the anterior zone. The implant diameter ranged from 3.3 to 4.8 mm, and length ranged from 6 to 14 mm, resulting in seven designs. The implant-bone interface was simulated by nonlinear frictional contact algorithm. For each design, vertical and oblique loadings of 150 N were applied, respectively, to each implant, and stresses and strains in the surrounding cortical bone were evaluated. RESULTS The biomechanics analysis provided results that the oblique loading would induce significantly higher interfacial stresses and strains than the vertical loading, while the intergroup stress difference significant levels was evaluated using t-tests method and the level of significance (.05) that was accepted for significance. Under both loadings, the maximal values were recorded in the 3.3 (diameter) x 10 (length) mm implant configuration, whose mean and peak values were both higher than that of others with significant statistical differences. The second maximal one is 4.1 x 6 mm configuration, and the minimal stresses were recorded in 4.8 x 10 mm configuration, whose strains were also near to lowest. CONCLUSIONS Increasing the diameter and length of the implant decreased the stress and strain on the alveolar crest, and the stress and strain values notably increased under buccolingual loading as compared with vertical loading, but diameter had a more significant effect than length to relieve the crestal stress and strain concentration.
[Movement disorders in Rett syndrome].

INTRODUCTION Rett syndrome is a progressive neurodevelopmental disorder with onset in early childhood occurring almost exclusively in females and caused by mutations in methyl-CpG- binding protein 2 (MECp2) and is one of the most frequent causes of mental retardation in females. Regression is a defining feature of Rett syndrome and during the regression period the patients develop autistic behaviour. This is the reason why Rett syndrome has been classified as a pervasive developmental autistic spectrum disorder. However movement disorders are so exuberant, characteristic and unique in Rett syndrome that is very difficult to an experienced clinician mistake both situations. DEVELOPMENT We can define Rett syndrome as a condition which manifests in the majority of the cases as a hyperkinetic movement disorder and progresses (at varying rates) to a bradykinetic disorder. The aim of this publication is to characterize and describe movement disorders in Rett syndrome based on a revision of the literature and the personal experience of the author.
Magnetic Resonance Imaging Study of the Level of Termination of the Conus Medullaris and the Thecal Sac: Influence of Age and Gender

Study Design. Sequential study of magnetic resonance imaging (MRI) of the spine for assessing the level of termination of the conus medullaris (CMT) and thecal sac (TST). Objectives. To determine the variation in CMT and the TST as a function of age and gender in an adult population without spinal deformity and to investigate the relationship between CMT and TST. Summary of Background Data. It is generally accepted that the conus medullaris terminates in the lower third of L1; however, a wide range of values has been reported in cadaver studies as well as in MRI studies during life. There have been only a few reports on the influence of gender on the CMT, and the influence of age has not been studied at all. There have been few studies on the range of termination of the thecal sac, and the influence of age and gender remain unexplored. Methods. We reviewed the 3-mm sagittal MR images of 635 patients, including 297 women and 338 men, with a mean age of 49.43 years. The CMT and TST were located in relation to spinal levels and assigned numerical values ranging from 0 to 13. Parametric and nonparametric statistical tests were used for the data analysis. Results. Mean CMT was at the level of the middle third of L1. The range span extended from the lower third of Th11 to the upper third of L3. The CMT displayed a small but significant positive correlation with age and with gender. Mean TST was at the level of the upper third of S2. The range extended from the lower third of L3 to the upper third of S5. The TST was not affected by gender, but age had an effect on TST. Conclusions. The CMT and TST displayed a wide range of values in our study. We detected small but systematic influences of gender and age on CMT and of age on TST, as well as a positive correlation between CMT and TST. These effects are small in amplitude, but they met all the criteria for statistical significance and have practical value for clinicians, as well as theoretical value for the medical and biologic community.
Psychiatric intervention improved pregnancy rates in infertile couples.

BACKGROUND Infertility has mental, social, and reproductive consequences. The aim of this study is to evaluate the effect of psychiatric intervention on the pregnancy rate of infertile couples. METHODS In an experimental and intervention-control study, 638 infertile patients who were referred to a university infertility clinic were evaluated; 140 couples (280 patients) with depression (from mild to severe) in at least one of the spouses were followed. All couples provided informed consent and were randomly numbered from 1 to 140. Those with even numbers were assigned to the psychological intervention before infertility treatment, and those with odd numbers were assigned to the psychological intervention during infertility treatment. Patients in the experimental group received 6-8 sessions of psychotherapy (individually) before beginning infertility treatment and were given Fluoxetine (antidepressant) at 20-60 mg per day during the psychotherapy period. The control group did not receive any intervention. Three questionnaires, the Beck Depression Inventory (BDI), the Stress Scale (Holmes-Rahe), and a sociodemographic questionnaire, were administered to all patients before and after treatment. The clinical pregnancy rate was compared between the two groups based on sonographic detection of gestational sac 6 weeks after the last menstrual period. The data were analysed by t test, X(2) and logistic regression methods. RESULTS Pregnancy occurred in 33 (47.1%) couples in the treatment group and in only 5 (7.1%) couples in the control group. There was a significant difference in pregnancy rate between the treatment and control groups (X(2)= 28.318, P < 0.001). To determine the effectiveness of psychiatric interventions on pregnancy, a logistic regression analysis was used. In this analysis, all demographic and infertility variables were entered in a stepwise manner. The results showed that in the treatment group, Pregnancy in the treatment group was 14 times higher than the control group (95% CI 4.8 to 41.7). Furthermore, cause of infertility was an effective factor of pregnancy. The adjusted odds ratio in male factor infertility was 0.115 (95% CI 0.02 to 0.55) and in both factors (male and female) infertility was 0.142 (95% CI 0.03 to 0.76) compared with the unexplained group. In this study, no other variables had any significant effect on pregnancy. CONCLUSION Based on the effectiveness of psychiatric interventions in increasing pregnancy rate, it is crucial to mandate psychiatric counselling in all fertility centres in order to diagnose and treat infertile patients with psychiatric disorders.
High Resistance of Human Parainfluenza Type 2 Virus Protein-Expressing Cells to the Antiviral and Anti-Cell Proliferative Activities of Alpha/Beta Interferons: Cysteine-Rich V-Specific Domain Is Required for High Resistance to the Interferons

ABSTRACT Human parainfluenza type 2 virus (hPIV-2)-infected HeLa (HeLa-CA) cells and hPIV-2 V-expressing HeLa (HeLa-V) cells show high resistance to alpha/beta interferons (IFN-α/β) irrespective of whether vesicular stomatitis virus or Sindbis virus is used as a challenge virus. When Sindbis virus is used, these cells show high susceptibility to human IFN-γ. Furthermore, the multiplication of HeLa-V cells is not inhibited by IFN-α/β. HeLa cells expressing the N-terminally truncated V protein show resistance to IFN-α/β, showing that the IFN resistance determinant maps to the cysteine-rich V-specific domain. A complete defect of Stat2 is found in HeLa-CA and HeLa-V cells, whereas the levels of Stat1 expression are not significantly different among HeLa, HeLa-CA, HeLa-P, and HeLa-V cells, indicating that IFN-α/β resistance of HeLa-CA and HeLa-V cells is due to a defect of Stat2. HeLa-SV41V cells show high resistance to all IFNs, and no expression of Stat1 can be detected. Stat2 mRNA is fully detected in HeLa-V cells. Stat2 was scarcely pulse-labeled in the HeLa-V cells, indicating that synthesis of Stat2 is suppressed or Stat2 is very rapidly degraded in HeLa-V cells. The V protein suppresses the in vitro translation of Stat2 mRNA more extensively than that of Stat1 mRNA. An extremely small amount of Stat2 can be detected in HeLa-V cells treated with proteasome inhibitors. The half-life of Stat2 is approximately 3.5 and 2 h in uninfected and hPIV-2-infected HeLa cells, respectively. This study shows that synthesis of Stat2 may be suppressed and Stat2 degradation is also enhanced in hPIV-2-infected HeLa and HeLa-V cells.
Spatial‐temporal structures of human alpha rhythms: Theory, microcurrent sources, multiscale measurements, and global binding of local networks

A theoretical framework supporting experimental measures of dynamic properties of human EEG is proposed with emphasis on distinct alpha rhythms. Robust relationships between measured dynamics and cognitive or behavioral conditions are reviewed, and proposed physiological bases for EEG at cellular levels are considered. Classical EEG data are interpreted in the context of a conceptual framework that distinguishes between locally and globally dominated dynamic processes, as estimated with coherence or other measures of phase synchronization. Macroscopic (scalp) potentials generated by cortical current sources are described at three spatial scales, taking advantage of the columnar structure of neocortex. New EEG data demonstrate that both globally coherent and locally dominated behavior can occur within the alpha band, depending on narrow band frequency, spatial measurement scale, and brain state. Quasi‐stable alpha phase structures consistent with global standing waves are observed. At the same time, alpha and theta phase locking between cortical regions during mental calculations is demonstrated, consistent with neural network formation. The brain‐binding problem is considered in the context of EEG dynamic behavior that generally exhibits both of these local and global aspects. But specific experimental designs and data analysis methods may severely bias physiological interpretations in either local or global directions. Hum. Brain Mapping 13:125–164, 2001. © 2001 Wiley‐Liss, Inc.
Filtration procedures supplemented with mitomycin C in the management of childhood glaucoma

AIMS To evaluate the outcome of filtering procedures supplemented with mitomycin C in children with glaucoma. METHODS All patients aged 17 or younger with glaucoma who underwent filtering surgery supplemented with mitomycin C at a tertiary care centre (n=21) during a 5 year interval (1992 and 1996) were included. One eye for each patient was entered into the analysis. The postoperative intraocular pressure (IOP), use of antiglaucoma medications, clinical stability of glaucoma, complications, and visual acuity were retrospectively evaluated. Kaplan–Meier survival curves were used to estimate the probability of success. RESULTS At the time of surgery mean age was 5.7 (SD 5.0) years. The most common diagnoses were trabeculodysgenesis (n=6) and aphakic glaucoma (n=8). Mean IOP before surgery was 35.7 (10.5) mm Hg. Average length of follow up was 18.6 (14.7) months. The probability of having IOP less than 21 mm Hg with no antiglaucoma medications and with clinically stable glaucoma 1 year after surgery was 76.9% in phakic eyes (n=13) and 0% in aphakic eyes (n=8). A phakic patient with Sturge–Weber’s syndrome had choroidal effusion after surgery that resolved spontaneously. In the aphakic group one patient had retinal detachment and another developed an encapsulated bleb. Visual acuity deteriorated in one patient. CONCLUSION A guarded filtration procedure with mitomycin C is relatively successful in phakic children with glaucoma, but unsuccessful in aphakic ones.
Morphological features of lipid droplet transition during porcine oocyte fertilisation and early embryonic development to blastocyst in vivo and in vitro

Lipid content in mammalian oocytes or embryos differs among species, with bovine and porcine oocytes and embryos showing large cytoplasmic droplets. These droplets are considered to play important roles in energy metabolism during oocyte maturation, fertilisation and early embryonic development, and also in the freezing ability of oocytes or embryos; however, their detailed distribution or function is not well understood. In the present study, changes in the distribution and morphology of porcine lipid droplets during in vivo and in vitro fertilisation, in contrast to parthenogenetic oocyte activation, as well as during their development to blastocyst stage, were evaluated by transmission electron microscopy (TEM). The analysis of semi-thin and ultra-thin sections by TEM showed conspicuous, large, electron-dense lipid droplets, sometimes associated with mitochondrial aggregates in the oocytes, irrespective of whether the oocytes had been matured in vivo or in vitro. Immediately after sperm penetration, the electron density of the lipid droplets was lost in both the in vivo and in vitro oocytes, the reduction being most evident in the oocytes developed in vitro. Density was restored in the pronculear oocytes, fully in the in vivo specimens but only partially in the in vitro ones. The number and size of the droplets seemed, however, to have decreased. At 2- to 4-cell and blastocyst stages, the features of the lipid droplets were almost the same as those of pronuclear oocytes, showing a homogeneous or saturated density in the in vivo embryos but a marbled or partially saturated appearance in the in vitro embryos. In vitro matured oocytes undergoing parthenogenesis had lipid droplets that resembled those of fertilised oocytes until the pronuclear stage. Overall, results indicate variations in both the morphology and amount of cytoplasmic lipid droplets during porcine oocyte maturation, fertilisation and early embryo development as well as differences between in vivo and in vitro development, suggesting both different energy status during preimplantation development in pigs and substantial differences between in vitro and in vivo development.
An In Vitro Method for Estimation of Arsenic Relative Bioavailability in Soil

This report summarizes the results of a study to develop an in vitro bioaccessibility (IVBA) extraction technique for estimating the relative bioavailability (RBA) of arsenic (As) in soil. The study was implemented in several steps. In step 1, key variables in the extraction protocol were identified. In step 2, 21 different extraction conditions were tested on 12 different soils with reliable RBA values measured in swine or monkeys to identify which yielded useful in vivo–in vitro correlations (IVIVC). In step 3, three extraction conditions were evaluated using 39 different test soils to make a final selection of the best IVIVC. In step 4, the within- and between-lab reproducibility of the extraction method was examined. The optimum IVIVC model for swine utilized a pH 1.5 IVBA extraction fluid, with an R 2 value of . 723. For monkeys, the optimum IVIVC model was obtained using a pH 7 IVBA extraction fluid that contained phosphate, with an R 2 value of . 755. Within-lab precision of IVBA results was typically less than 3%, with an average of 0.8% for all 4 labs. Between-lab variation in mean IVBA values was generally less than 7%, with an overall average of 3%. The principal advantages of this IVBA method compared to other in vitro methods described in the literature are that (1) the fluids and extraction conditions are simple, (2) the results have been calibrated against a larger data set than any other method, and (3) the method has been demonstrated to be reproducible both within and between labs.
Arts in health: the value of evaluation

This article aims to discuss a number of different approaches to the evaluation of the value of implementing arts projects and arts programmes, presenting the evidence of their impact when implemented either in community settings or within a healthcare environment. It focuses on the evidence provided by quantitative research and also discusses the merits of applying qualitative research, outlining their different approach of collecting, interpreting and analysing the data. A brief consideration is also given to the arguments underpinning the introduction of humanities and arts in medical and nursing education and training, an approach that promotes personal development and, most importantly, encourages the health practitioner to become more humane, understanding and sympathetic in their everyday practice. It also renders them more amenable to the introduction of art in the healthcare environment. The article concludes that the value of evaluating the effect of the arts in healthcare resides in providing to all involved in designing, implementation and funding, the knowledge of what, when and how to introduce different art forms to achieve the most effective results. Evaluations produce evidence of the impact of different art forms in encouraging beneficial clinical outcomes in patients, in enhancing the quality of healthcare services and in improving working conditions and job satisfaction.
Sphingolipid‐mediated restoration of Mitf expression and repigmentation in vivo in a mouse model of hair graying

Recent advances in the identification and characterisation of stem cell populations has led to substantial interest in understanding the precise triggers that would operate to induce activation of quiescent stem cells. Melanocyte stem cells (MSCs) reside in the bulge region of the hair follicles and are characterised by reduced expression of the microphthalmia‐associated transcription factor (Mitf) and its target genes implicated in differentiation. Vitiligo is characterised by progressive destruction of differentiated melanocytes. However, therapies using UV irradiation therapy can induce a degree of repigmentation, suggesting that MSCs may be activated. As Mitf is implicated in control of proliferation, we have explored the possibility that inducing Mitf expression via lipid‐mediated activation of the p38 stress‐signalling pathway may represent a re‐pigmentation strategy. Here we have isolated from placental extract a C18:0 sphingolipid able to induce Mitf and tyrosinase expression via activation of the p38 stress‐signalling pathway. Strikingly, in age‐onset gray‐haired C57BL/6J mice that exhibit decaying Mitf expression, topical application of placental sphingolipid leads to increased Mitf in follicular melanocytes and fresh dense black hair growth. The results raise the possibility that lipid‐mediated activation of the p38 pathway may represent a novel approach to an effective vitiligo therapy.
The use of α-2A adrenergic agonists for the treatment of attention-deficit/hyperactivity disorder

Neuropsychiatric disorders involve dysfunction of the prefrontal cortex (PFC), a highly evolved brain region that mediates executive functioning. The dorsolateral PFC is specialized for regulating attention and behavior, while the ventromedial PFC is specialized for regulating emotion. These abilities arise from PFC pyramidal cell networks that excite each other to maintain goals and rules ‘in mind’. Imaging studies have shown reduced PFC gray matter, weaker PFC connections and altered PFC function in patients with attention-deficit/hyperactivity disorder. Thus, medications that strengthen PFC network connections may be particularly useful for the treatment of attention-deficit/hyperactivity disorder and related disorders. Recent data show that compounds such as guanfacine can enhance PFC function by stimulating postsynaptic α-2A receptors on the dendritic spines of PFC pyramidal cells where networks interconnect. Stimulation of these receptors inhibits cAMP signaling, thus closing potassium channels and strengthening physiological connections. These actions may benefit patients with weak PFC function.
Antimineralization treatments in stentless porcine bioprostheses: an experimental study.

BACKGROUND AND AIM OF THE STUDY Photo-oxidation treatment of porcine stentless bioprostheses (Photofix) was compared with glutaraldehyde fixation, with either AOA (Freestyle valve) or Tween-80 (Edwards Prima Plus valve). METHODS Six valves of each type were implanted in juvenile sheep, in the pulmonary position. Valves were explanted after three or six months and examined macroscopically, by X-radiography, and by light and transmission electron microscopy. Calcium content was determined by atomic absorption spectrometry. RESULTS The cusps of all valves were free of calcification, and had normal histology and function. Calcium contents (median +/- IQR) were 0.63+/-0.45, 0.73+/-1.46 and 0.46+/-1.42 microg/mg for the Photofix, Freestyle and Prima Plus valves, respectively (p = NS). Calcium contents of the aortic wall portions were 0.71+/-1.27 (Photofix), 10.78+/-77.22 (Freestyle) and 28.70+/-66.53 (Prima Plus) (p <0.05 for Photofix versus Freestyle or Prima Plus). CONCLUSION Photo-oxidation of a porcine stentless valve prevents calcification not only in the cusps, but also in the aortic wall portion.
Interactions between environmental factors and polymorphisms in angiogenesis pathway genes in esophageal adenocarcinoma risk: A case‐only study

Gastroesophageal reflux disease (GERD), higher body mass index (BMI), smoking, and genetic variants in angiogenic pathway genes have been individually associated with increased risk of esophageal adenocarcinoma. However, how angiogenic gene polymorphisms and environmental factors jointly affect esophageal adenocarcinoma development remains unclear.