Highly multimodal structure of high topological charge extreme ultraviolet vortex beams.

Optical beams carrying orbital angular momentum are a very active field of research for their prospective applications, especially at short wavelengths. We consider here such beams produced through high-harmonic generation (HHG) in a rare gas and analyze the characterization of their high-charge vortex structure by an extreme ultraviolet Hartmann wavefront sensor. We show that such HHG beams are generally composed of a set of numerous vortex modes. The sensitivity of the intensity and phase of the HHG beam to the infrared laser aberrations is investigated using a deformable mirror.

Emergency consultations for male adolescents: Somatic and psychological characteristics and profiles of regular users. A retrospective chart review.

INTRODUCTION: Male adolescents' mental health has been understudied compared to their female counterparts and is not well known among health professionals. This is particularly problematic in emergencies because the number of such patients is increasing. OBJECTIVES: To identify the type of demand for care and the characteristics of male adolescents' emergency room visits. To describe the sociodemographic data and clinical characteristics of regular users. METHOD: This is a retrospective study of all medical records of male adolescents aged 14-18, admitted between 2014 and 2015 to the pediatric emergency room of a Swiss university hospital. Sociodemographic and clinical data (e.g., degree of urgency, diagnosis, length of stay, emergency service use, and emergency discharge destinations) were collected. Descriptive and multivariate analyses were performed using STATA 13.1 software. RESULTS: Over the 2-year study period, 2045 male adolescents consulted in emergency departments for a total of 3199 admissions. The average age was 15.6 years (SD, 1). Most consultations were non-urgent (93%) and the reasons included musculoskeletal (43%), dermatological (13%), and digestive (10%) complaints. Forty-two male adolescents (2%) had four or more visits within the 2-year period and were considered regular users; they were also more likely to have psychological complaints (adjusted OR, 5.04; 95% CI, 1.81-13.72) and comorbidities (adjusted OR, 2.55; 95% CI, 1.25-5.21) when compared to their counterparts with fewer than four visits. CONCLUSION: Since regular users are at greater risk of having psychological complaints and comorbidities during their first emergency room visit, a systematic assessment of these adolescents' mental health levels and overall health indicators is recommended.

Hartmann wavefront sensor characterization of a high charge vortex beam in the extreme ultraviolet spectral range.

We demonstrate for the first time, to the best of our knowledge, the ability of extreme ultraviolet (XUV) Hartmann wavefront sensors to characterize high charge vortex beams produced by high-order harmonic generation up to the order of 25. We also show that phase matched absorption limited high harmonic generation is able to maintain the high charge vortex structure of the XUV beam even in a rather long (1 cm) generation medium.

Gain dynamics in quickly ionized plasma for seeded operated soft x-ray lasers.

Harmonic seeded operation of a neon-like titanium plasma-based soft x-ray laser is described. The plasma amplifier is pumped with a variation of the grazing incidence technique involving a fast and localized ionization step. We discuss its effect on gain dynamics by measuring the amplifying factor as a function of the delay between pump pulse and harmonic seed. Two different regimes are pointed out, following the pumping scheme used. For one of them, a delay in the gain generation compared with the pumping laser pulse is observed.

Comparison between trans-obturator trans-vaginal mesh and traditional anterior colporrhaphy in the treatment of anterior vaginal wall prolapse: results of a French RCT.

INTRODUCTION AND HYPOTHESIS: To compare the efficacy of a collagen-coated polypropylene mesh and anterior colporrhaphy in the treatment of stage 2 or more anterior vaginal wall prolapse. METHODS: Prospective, randomized, multicenter study conducted between April 2005 and December 2009. The principal endpoint was the recurrence rate of stage 2 or more anterior vaginal wall prolapse 12 months after surgery. Secondary endpoints consisted of functional results and mesh-related morbidity. RESULTS: One hundred and forty-seven patients were included, randomized and analyzed: 72 in the anterior colporrhaphy group and 75 in the mesh group. The anatomical success rate was significantly higher in the mesh group (89%) than in the colporrhaphy group (64%) (p = 0.0006). Anatomical and functional recurrence was also less frequent in the mesh group (31.3% vs 52.2%, p = 0.007). Two patients (2.8%) were reoperated on in the colporrhaphy group for anterior vaginal wall prolapse recurrence. No significant difference was noted regarding minor complications. An erosion rate of 9.5% was noted. De novo dyspareunia occurred in 1/14 patients in the colporrhaphy group and in 3/13 patients in the mesh group. An analysis of the quality of life questionnaires showed an overall improvement in both groups, with no statistical difference between them. Satisfaction rates were high in both groups (92% in the colporrhaphy group and 96% in the mesh group). CONCLUSION: Trans-obturator Ugytex mesh used to treat anterior vaginal wall prolapse gives better 1-year anatomical results than traditional anterior colporrhaphy, but with small a increase in morbidity in the mesh group.

Gain lifetime measurement of a Ni-like Ag soft X-ray laser.

Experimental results of a two-stage Ni-like Ag soft X-ray laser operated in a seed-amplifier configuration are presented. Both targets were pumped applying the double-pulse grazing incidence technique with intrinsic travelling wave excitation. The injection of the seed X-ray laser into the amplifier target was realized by a spherical mirror. The results show amplification of the seed X-ray laser and allow for a direct measurement of the gain lifetime. The experimental configuration is suitable for providing valuable input for computational simulations.

Energy transport in short-pulse-laser-heated targets measured using extreme ultraviolet laser backlighting.

The accurate characterization of thermal electron transport and the determination of heating by suprathermal electrons in laser driven solid targets are both issues of great importance to the current experiments being performed at the National Ignition Facility, which aims to achieve thermonuclear fusion ignition using lasers. Ionization, induced by electronic heat conduction, can cause the opacity of a material to drop significantly once bound-free photoionization is no longer energetically possible. We show that this drop in opacity enables measurements of the transmission of extreme ultraviolet (EUV) laser pulses at 13.9 nm to act as a signature of the heating of thin (50 nm) iron layers with a 50-nm thick parylene-N (CH) overlay irradiated by 35-fs pulses at irradiance 3×10(16) Wcm(-2). Comparing EUV transmission measurements at different times after irradiation to fluid code simulations shows that the target is instantaneously heated by hot electrons (with approximately 10% of the laser energy), followed by thermal conduction with a flux limiter of ≈0.05.

Low energy prepulse for 10 Hz operation of a soft-x-ray laser.

The influence on Nickel-like Molybdenum soft-x-ray laser performance and stability of a low energy laser prepulse arriving prior to the main laser pumping pulses is experimentally investigated. A promising regime for 10 Hz operation has been observed. A four times increase in soft-x-ray laser operation time with a same target surface is demonstrated. This soft-x-ray laser operation mode corresponds to an optimum delay between the prepulse and the main pulses and to a prepulse energy greater than 20 mJ. We also show that this regime is not associated with a weaker degradation of the target or any reduced ablation rate. Therefore the role of preplasma density gradient in this effect is discussed.

Temporal coherence and spectral linewidth of an injection-seeded transient collisional soft x-ray laser.

The temporal coherence of an injection-seeded transient 18.9 nm molybdenum soft x-ray laser was measured using a wavefront division interferometer and compared to model simulations. The seeded laser is found to have a coherence time similar to that of the unseeded amplifier, ~1 ps, but a significantly larger degree of temporal coherence. The measured coherence time for the unseeded amplifier is only a small fraction of the pulsewidth, while in the case of the seeded laser it approaches full temporal coherence. The measurements confirm that the bandwidth of the solid target amplifiers is significantly wider than that of soft x-ray lasers that use gaseous targets, an advantage for the development of sub-picosecond soft x-ray lasers.

Fourier-limited seeded soft x-ray laser pulse.

We present what we believe to be the first measurement of the spectral properties of a soft x-ray laser seeded by a high-order harmonic beam. Using an interferometric method, the spectral profile of a seeded Ni-like krypton soft x-ray laser (32.8 nm) generated by optical field ionization has been experimentally determined, and the shortest possible pulse duration has been deduced. The source exhibits a Voigt spectral profile with an FWHM of 3.1+/-0.3 mA, leading to a Fourier-transform pulse duration of 4.7 ps. This value is comparable with the upper limit of the soft x-ray pulse duration determined by experimentally investigating the gain dynamics, from which we conclude that the source has reached the Fourier limit. The measured bandwidth is in good agreement with the predictions of a radiative transfer code, including gain line narrowing and saturation rebroadening.

A recycling framework for the construction of Bonferroni-based multiple tests.

In this paper we describe Bonferroni-based multiple testing procedures (MTPs) as strategies to split and recycle test mass. Here, 'test mass' refers to (parts of) the nominal level alpha at which the family-wise error rate is controlled. Briefly, test mass is split between different null hypotheses, and whenever a null hypothesis is rejected, the part of alpha allocated to it may be recycled to the testing of other hypotheses. These recycling MTPs are closed testing procedures based on raw p-values associated with testing the individual null hypotheses, and the class of such MTPs includes, for example, serial and parallel gatekeeping, fallback and Holm procedures. Graphical displays and a concise algebraic notation are provided for such MTPs. This recycling approach has pedagogical advantages and may facilitate the tailoring of MTPs for different purposes.

Evidence of ultrashort electron bunches in laser-plasma interactions at relativistic intensities.

The second harmonic of the laser light (2omega(0)) is observed on the rear side of thick solid targets irradiated by a laser beam at relativistic intensities. This emission is explained by the acceleration by the laser pulse in front of the target of short bunches of electrons separated by the period (or half the period) of the laser light. When reaching the rear side of the target, these electron bunches emit coherent transition radiation at 2omega(0). The observations indicate that, in our conditions, the minimum fraction of the laser energy transferred to these electron bunches is of the order of 1%.

Involvement of cytokines in eating disorders: a critical review of the human literature.

A number of findings from clinical and animal studies indicate that pro-inflammatory cytokines may play roles in eating disorders. The measurement of pro-inflammatory cytokines (IL-1, IL-6, TNFalpha), which are known to decrease food intake, provides highly variable data from which firm conclusions cannot be drawn. In most of the longitudinal studies where pro-inflammatory cytokines have been shown to be impaired in anorexia or bulimia nervosa, a return to normal values was observed after renutrition. However these findings do not exclude the possibility that pro-inflammatory cytokines might be overproduced in specific brain areas and act locally without concomitantly increased serum or immune production. It was also pointed out that the production of the major type-1 cytokines (especially IL-2) was depressed in anorexia nervosa. It remains unclear whether this is due to undernutrition or to a specific underlying cause common to eating disorders. The impaired cytokine profile observed in eating disorders could be related to several factors including impaired nutrition, psychopathological and neuroendocrine factors. More particular attention should be devoted to the deregulation of the anti/pro-inflammatory balance. Deregulation of the cytokine network may be responsible for medical complications in eating disorder patients who are afflicted with chronic underweight.

[French validation study of the levels of emotional awareness scale]. / Validation de la version française de l'échelle des niveaux de conscience émotionnelle.

According to a thesis based on the idea of an influence of cognitions in the structuring of internal reality, emotional awareness, ie the capacity of representing your own emotional experience and that of others, is a cognitive process that goes into maturation. Defining this concept, Lane and Schwartz present a cognitivo-developmental model in five stages of the processes of symbolization, accounting for the differences in levels of emotional awareness observed in individuals. The organization of these cognitive processes would thus be structured in well differentiated stages, in which the development of the emotions would be inseparable from the development of ego and of the relation to others. These authors focus on the capacity of representing in a conscious way the emotional experience and consider that verbal representations used to describe the contents of what is experience constitute a good reflection of the organization structural of the emotional awareness. Therefore, they worked out an instrument of evaluation: the Levels of Emotional Awareness Scale (LEAS), which measures the capacity to describe your own emotional experience and the one you allow to others, in an emotional situation. The system of quotation of this scale is based on the analysis of the verbal contents of the provided answers, in direct reference to the authors' theory of the levels of differentiation and integration of the emotional experience. It is therefore an empirical measurement which is centered specifically on the structural organization of the emotional experience. The various studies of validation of this instrument show that it presents solid metrological properties. This work presents the validation of the French version of Lane and Schwartz's LEAS. Validity and fidelity were studied in a group of 121 healthy subjects. This setting is part of a larger clinical evaluation, also including a collection of socio-demographic and clinical data, and other instruments of self-evaluation (Beck Depression Inventory, BDI, Hospital Anxiety and Depression Scale, HAD, and Toronto Alexithymia Scale, TAS). The face validity appears correct: the questionnaire was well accepted and seemed easy to complete. A principal components analysis of the correlation matrix of the set of items was used as the method of extraction of the various factors and made it possible to confirm the unidimensionality of the instrument. The number of factors to be retained was given according to Kaiser and Cattell criteria. The internal consistency was evaluated through computation of the Cronbach coefficient, whose value is 0.75 for the scale's global score. The confidence interval of the margin of error of LEAS scores was also measured; for the global score it is IC=[m 6.1]. The measure given by this rating scale may therefore be considered sufficiently accurate, since this interval is weak. A study of the frequency of quotation of each item of the instrument was carried out, in order to check the homogeneity and the uniformity of quotations, as well as a diagram of distribution of the score, showing that it follows a law which is close to a normal law. The concurrent validity could only be studied via the similar concept of alexithymia, measured with the TAS, for there is not other instrument validated in French evaluating the levels of emotional awareness, and these two instruments seem to measure different notions, because none of the correlations between the scores of these two questionnaires are significant. Concerning discriminant validity, the Pearson correlation coefficients between the global score for the LEAS, the BDI score and the HAD sub-scores for depression and anxiety were measured; it is clear that the level of emotional awareness is independent from negative affects. Furthermore, the study of the reliability made it possible to highlight excellent intra-class correlation coefficients (r=0.993). The French version of the Levels of Emotional Awareness Scale thus appears to be valid and accurate and should allow the study of levels of emotional awareness on psychopathology. It is about an easily acceptable and simple questionnaire of use in varied clinical circumstances.

Cytokines and depression: an analogic approach.

A growing body of evidence suggests that major depressive disorders may be accompanied by immune dysfunction and more particularly by an enhanced production of pro-inflammatory cytokines. The possible involvement of cytokines in depressive illness are based upon an analogic model. Pro-inflammatory cytokines are known to induce behavioral effects, and neuro-endocrine and immune activation similar to those observed in depression; these can be alleviated by antidepressant treatment. In this paper, we review research literature on the links between depressive illness and cytokine production and address further questions on this cytokine pathway. Further research is needed to see whether cytokines sustain specific depressive syndromes or whether cytokines induce depressive-like symptoms.

Cytokines and anorexia nervosa.

OBJECTIVE: Recent studies have indicated that the inflammatory cytokines could be implicated in anorexia nervosa and in its complications. To determinate the potential role of interleukins (IL-1, IL-2, IL-4, IL-6, IL-10), interferon (IFN gamma), tumor necrosis factor (TNF-alpha), and transforming growth factor (TGF-beta2) in anorexia nervosa, serum concentrations of these cytokines were measured in patients suffering from anorexia nervosa in comparison to healthy subjects. METHOD: Twenty-nine anorexic women according to DSM-IV criteria participated in the study. The control group consisted of 20 healthy women without eating disorders, mood disorders, and immunological disorders. RESULTS: We find that serum IL-2 and TGF-beta2 concentrations were both significantly decreased in anorexic patients, although the other cytokines did not differ significantly between the two groups. CONCLUSION: Our results show that in patients with anorexia nervosa, there are lower levels of specific cytokines (especially IL-2 and TGF-beta2). These levels may reflect the combination of impaired nutrition and weight loss, therefore, the dysregulation of these cytokines may contribute in anorexia's complications. Follow-up studies should examine the effects of parameters such as starvation, psychopathologic factors, and psychoneuroendocrinological perturbation which could affect interplay between cytokines, neuropeptides, and neurotransmitters.

Obsessive compulsive disorders in eating disorders.

OBJECTIVE: The aim of this study is to explore current and lifetime prevalence of obsessive compulsive disorders (OCD) in eating disorder (ED) subgroups and subtypes defined by the DSM-IV and to study the chronology of appearance of these disorders taking into account the role played by denutrition. METHOD: Current and lifetime prevalence were investigated using the Mini International Neuropsychiatric Interview (MINI) and the Yale-Brown Obsessive Compulsive Scale in a sample of 89 DSM-IV ED patients (58 AN and 31 BN) and 89 matched controls. RESULTS: Current and lifetime prevalence of OCD in ED was significantly higher than in general population (15.7% and 19% vs. 0% and 1.1%, P<.05). Anorexic patients presented a slightly higher current and lifetime comorbidity than bulimic patients (19% and 22.4% vs. 9.7% and 12.9%, n.s.). Purging anorexia was the diagnostic subtype, which presented the higher prevalences (29% and 43%), followed by restrictive anorexia (16%) and purging bulimia (13%). In the great majority of cases (65%), OCD diagnosis preceded ED diagnosis. Finally, OCD current prevalence and Y-BOCS scores of underweight patients were not significantly higher than normal-weight patients, suggesting that there were only limited links between denutrition and obsessionality.

Psychoactive substance consumption in eating disorders.

Research investigating the comorbidity between eating disorders and substance-use disorders have reported positive but contrasting results. The aim of this study was to further explore this association by studying patterns of consumption of the entire range of psychoactive substances (alcohol, specific drugs, prescribed psychotropics) in a large sample (N=271) of eating-disorder DSM-IV subtypes. Results show that subjects suffering from anorexia of the restrictive type show significantly less drug-consumption behaviors and alcohol abuse and/or dependence disorders than purging anorexic and bulimic subjects. No difference was found in the total consumption of psychotropics among the four groups of eating disorders. However, more than half of eating-disorder subjects are regular consumers of psychotropics. Among these regular consumers, bulimics self-prescribe and increase their doses of psychotropics significantly more than anorexics. Features of impulsivity that are associated with purging and bulimic behaviors could play a specific role in these patterns of comorbidity and account for such differences.

Alexithymia and depression in eating disorders.

We compared alexithymia and depression ratings for non-hospitalized women meeting DSM-IV criteria for anorexia nervosa (n=32) and bulimia nervosa (n=32) to ratings for healthy women (n=74). Alexithymia was evaluated by the Toronto Alexithymia Scale (TAS-20) and depression by the Hospital Anxiety and Depression Scale (HAD). TAS and HAD scores were significantly higher in anorexic compared to bulimic patients, although these two scales were significantly and positively correlated (r=0.53, P=0.001). After taking depression into account as a confounding variable, rates of alexithymia did not vary according to the type of eating disorder (anorexia or bulimia).

[Alexithymia and depression in eating disorders]. / Alexithymie et dépression dans les troubles des conduites alimentaires.

Patients suffering from eating disorder show elevated rates of alexithymia and depression. We compared alexithymia and depression ratings for non-hospitalized women meeting DSM IV criteria for anorexia nervosa (n = 32) and bulimia nervosa (n = 32) to healthy women (n = 74). Alexithymia was evaluated by the Toronto Alexithymia Scale (TAS-20) and depression by the Hospital Anxiety and Depression Scale (HAD). We found that TAS and HAD scores were significantly higher in anorexic compared to bulimic patients, although alexithymia and depression, as evaluated, were significantly and positively correlated with each other (r = 0.53, p = 0.001). Finally, a logistic regression with alexithymia and depression as independent variables showed a strong correlations between the HAD ratings and anorexia, but no correlations between TAS score and the eating disorder subgroups. In eating disorder patients, alexithymia, as evaluated by the Toronto Alexithymia Scale, seems to exhibit a thymo-dependent component which could be secondary to concurrent depression. Through recent studies and results of our research, we analyze and give several interpretations which may explain this correlation between alexithymia and depression.