Functioning and neurocognition in very early and early-life onset bipolar disorders: the moderating role of bipolar disorder type.

Defining homogeneous subgroups of bipolar disorder (BD) is a major goal in personalized psychiatry and research. According to the neurodevelopmental theory, age at onset may be a key variable. As potential trait markers of neurodevelopment, cognitive and functional impairment should be greater in the early form of the disease, particularly type 1 BD (BD I). The age at onset was assessed in a multicenter, observational sample of 4190 outpatients with BD. We used a battery of neuropsychological tests to assess six domains of cognition. Functioning was measured using the Functioning Assessment Short Test (FAST). We studied the potential moderation of the type of BD on the associations between the age at onset and cognitive and functioning in a subsample of 2072 euthymic participants, controlling for potential clinical and socio-demographic covariates. Multivariable analyses showed cognition to not be impaired in individuals with early (21-30 years) and very early-life (before 14 years) onset of BD. Functioning was equivalent between individuals with early and midlife-onset of BD II and NOS but better for individuals with early onset of BD I. In contrast, functioning was not worse in individuals with very early-onset BD I but worse in those with very early-onset BD II and NOS. Early-life onset BDs were not characterized by poorer cognition and functioning. Our results do not support the neurodevelopmental view that a worse cognitive prognosis characterizes early-life onset BD. This study suggests that functional remediation may be prioritized for individuals with midlife-onset BD I and very early life onset BD 2 and NOS.

[Borderline personality disorder: state of knowledge and attitudes among french-speaking mental health professionnals]. / Trouble de la personnalité borderline: état des connaissances et des représentations auprès de praticiens francophones en santé mentale.

OBJECTIVES: Patients suffering from borderline personality disorder are very prevalent in various settings (emergency rooms, psychiatric and general hospitals, ambulatory consultations). However, it remains one of the most stigmatized and neglected mental health conditions, albeit being an area that is responsible for very interesting advances in psychotherapy. Today, the prognosis of patients with borderline personality disorder is rather favorable, provided that they follow a dedicated psychotherapy. Conceptions about this condition therefore deserve to be updated as it is sufficiently described in the literature that negative attitudes towards these patients diminish the quality of care they receive as well as their prognosis, and that these attitudes change with training. We decided to study the state of knowledge and attitudes towards borderline personality disorder in a group of French-speaking caregivers interested in these patients. METHODS: Between 2019 and 2020, at the start of training sessions in psychotherapeutic approaches to borderline personality disorder, we provided two questionnaires to 126 caregivers from various professional backgrounds (psychiatrists or child psychiatrists, psychologists, mental health nurses, social workers). The first consisted of 13 questions with 3 choice answers aimed at testing knowledge about borderline personality disorder and the second of 11 questions in the form of a Likert scale aimed at evaluating attitudes towards these patients (e.g. degree of comfort, involvement, hope, avoidance with these patients) adapted frome a questionnaire of Blake and colleagues. RESULTS: The sample consisted of 126 caregivers (69 psychiatrists/pedopsychiatrists; 19 mental health nurses; 23 psychologists; 14 social workers). Fifty three of them (42.06 %) worked in an outpatient setting (either in a state facility or in private practice), 50 (39.68 %) worked in an inpatient psychiatric unit, 13 (10.32%) in both care systems, and 10 (7.94 %) worked in other facilities such as sheltered homes or workshops for persons with psychiatric disabilities. The average number of years in postgraduate training was 7.73 (SD=5.67; rank=0 to 31), and 35 (27.78%) had received at least one training course on borderline disorder in the past. The mean age of the sample was 37.89 (SD=10.08; rank=20 to 64) and there were 76 women (60.32%) and 50 men (39.68%). Concerning the first questionnaire (knowledge), the rate of correct responses among caregivers was relatively low (54%) considering that the vast majority of those assessed were caregivers already trained in mental health who were working with patients suffering from borderline personality disorder. The results showed a significant knowledge gap among professionals, in particular in the nursing profession, illustrating an ever more flagrant shortfall in formations in this sub-population. Concerning the second questionnaire (attitudes), the answers showed that attitudes of caregivers towards patients with borderline personality disorder were still tinged with fear and lack of confidence in taking charge of them. Thus, one participant out of five would have liked to avoid these patients, more than 12% of caregivers did not appreciate them, and 23% thought that they were manipulative. In addition, nearly half of the caregivers surveyed had low confidence in their ability to make a positive difference in the lives of borderline patients. However, there was a recognition of their distress as well as a demand for dedicated training. CONCLUSIONS: Stigmas and ignorance persist around patients with borderline personality disorder. Current training courses do not allow caregivers who are on the front lines (in particular nurses) and who wish to be trained to acquire sufficient knowledge and tools necessary for the care of patients suffering from this disorder. This calls for an improvement in training as well as a reflection on the most appropriate approaches possible to the various target audiences.

Demographic, clinical, and service-use characteristics related to the clinician's recommendation to transition from child to adult mental health services.

PURPOSE: The service configuration with distinct child and adolescent mental health services (CAMHS) and adult mental health services (AMHS) may be a barrier to continuity of care. Because of a lack of transition policy, CAMHS clinicians have to decide whether and when a young person should transition to AMHS. This study describes which characteristics are associated with the clinicians' advice to continue treatment at AMHS. METHODS: Demographic, family, clinical, treatment, and service-use characteristics of the MILESTONE cohort of 763 young people from 39 CAMHS in Europe were assessed using multi-informant and standardized assessment tools. Logistic mixed models were fitted to assess the relationship between these characteristics and clinicians' transition recommendations. RESULTS: Young people with higher clinician-rated severity of psychopathology scores, with self- and parent-reported need for ongoing treatment, with lower everyday functional skills and without self-reported psychotic experiences were more likely to be recommended to continue treatment. Among those who had been recommended to continue treatment, young people who used psychotropic medication, who had been in CAMHS for more than a year, and for whom appropriate AMHS were available were more likely to be recommended to continue treatment at AMHS. Young people whose parents indicated a need for ongoing treatment were more likely to be recommended to stay in CAMHS. CONCLUSION: Although the decision regarding continuity of treatment was mostly determined by a small set of clinical characteristics, the recommendation to continue treatment at AMHS was mostly affected by service-use related characteristics, such as the availability of appropriate services.

Extremely Severe Case of COVID-19 Pneumonia Recovered Despite Bad Prognostic Indicators: a Didactic Report.

COVID-19 is a highly infectious respiratory disease caused by severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2). Starting from Wuhan (China) where it was firstly reported, it rapidly spread to the rest of the world, causing a pandemic with more than 300,000 deaths to date. We report an extremely severe case of coronavirus pneumonia in an over 80-year-old patient with hypertension, coronary heart disease, chronic heart failure, and chronic obstructive pulmonary disease. Despite a clearly poor anamnestic and clinical prognostic forecast, she was successfully discharged thanks to a careful evaluation of the case and of the complications that have arisen. Although a higher vulnerability of geriatric patients has been observed, the literature on elderly COVID-19 patients has remained very scarce, especially in those over 80. The article aims to explore factors that may allow the successful outcome and provides important elements to better understand this disease.

[How do children and adolescents with Attention Deficit Hyperactivity Disorder (ADHD) experience lockdown during the COVID-19 outbreak?] / Comment les enfants et adolescents avec le trouble déficit d'attention/hyperactivité (TDAH) vivent-ils le confinement durant la pandémie COVID-19 ?

OBJECTIVES: During the COVID-19 pandemic, the French government has decided a general lockdown. This unprecedented situation has raised concerns about children's and adolescent's mental health. Children and adolescents diagnosed with attention deficit hyperactivity disorder (ADHD) may find this context of restrained activity particularly tricky. The objectives of our study are to gather information about the well-being and global life conditions of children and adolescents with ADHD during the COVID-19 outbreak in France. METHODS: We designed a survey including both open-ended questions and questionnaire items for parents of children and adolescents with ADHD. Parents responded to the following open-ended questions: 1) "How is your child doing since the lockdown?" 2) "How is life at home since the lockdown?" 3) "If you had a remote service provision with a mental health professional (e.g. by telephone or video technology), please share your thoughts and any suggestions with us" 4) "Please share any other items that you think are important about ADHD symptoms of your child and the lockdown situation". This survey was posted on social media on the 6th of April and disseminated by French ADHD-parent and patient organizations. The present article reports the descriptive, qualitative and textometrical analyses of the survey. RESULTS: Between day 20 and 30 of lockdown, 538 parents responded to the survey, and we included 533 responses in the final analysis. The vast majority of responders were women 95 % (95 % CI 93,50; 97,18) with children whose mean age was 10,5 (95 % CI 7.58; 13.44). Since the lockdown, 34.71 % (95 % CI 30.70; 38.94) of children experienced a worsening in well-being, 34.33 % (95 % CI 30.34; 38.56) showed no significant changes and 30.96 % (95 % CI 27.09; 35.10) were doing better according to their parents. The thematic analysis showed that an improvement of their children's anxiety was one of the main topics addressed by parents. This improvement related to less school-related strain and flexible schedules that respected their children's rhythm. Improved self-esteem was another topic that parents linked with a lesser exposure of their children to negative feed-back. Parents repeatedly reported both inattention and hyperactivity/impulsivity. However, optimal lockdown life conditions seemed to compensate for the impact of ADHD symptoms (e.g. sufficient space at home, presence of a garden). Some parents reported worsening of general well-being in their children, and this manifested as oppositional/defiant attitudes and emotional outbursts. Parents also cited sleep problems and anxiety in this context. As regards everyday life during lock-down, at-home schooling was another major topic-parents described that their children struggled to complete school-related tasks and that teachers seemed to have forgotten about academic accommodations. The lockdown situation seems to have raised parents' awareness of the role of inattention and ADHD symptoms in their children's learning difficulties. Due to potential selection biases, the results of our survey may not be generalizable to all children and adolescents with ADHD. The main strengths of this rapid survey-based study lies in the reactivity of the participants and the quality and diversity of their responses to the open-ended questions. CONCLUSIONS: According to their parents, most children and adolescents with ADHD experience stability or improvement of their well-being. An improvement in school-related anxiety and the flexible adjustment to the children's' rhythms as well as parents' increased awareness of the difficulties their children experience are among the key topics in parents' descriptions.

Correction to: A PRISMA-compliant systematic review of the endpoints employed to evaluate symptomatic treatments for primary headaches.

Following publication of the original article [1], we have been notified that the name of author five was spelled incorrectly as M. Ferrili, when the correct spelling is MAN Ferilli.

A PRISMA-compliant systematic review of the endpoints employed to evaluate symptomatic treatments for primary headaches.

BACKGROUND: Primary headache are prevalent and debilitating disorders. Acute pain cessation is one of the key points in their treatment. Many drugs have been studied but the design of the trials is not usually homogeneous. Efficacy of the trial is determined depending on the selected primary endpoint and usually other different outcomes are measured. We aim to critically appraise which were the employed outcomes through a systematic review. METHODS: We conducted a systematic review of literature focusing on studies on primary headache evaluating acute relief of pain, following the PRISMA guideline. The study population included patients participating in a controlled study about symptomatic treatment. The comparator could be placebo or the standard of care. The collected information was the primary outcome of the study and all secondary outcomes. We evaluated the studied drug, the year of publication and the type of journal. We performed a search and we screened all the potential papers and reviewed them considering inclusion/exclusion criteria. RESULTS: The search showed 4288 clinical trials that were screened and 794 full articles were assessed for eligibility for a final inclusion of 495 papers. The studies were published in headache specific journals (58%), general journals (21.6%) and neuroscience journals (20.4%). Migraine was the most studied headache, in 87.8% studies, followed by tension type headache in 4.7%. Regarding the most evaluated drug, triptans represented 68.6% of all studies, followed by non-steroidal anti-inflammatories (25.1%). Only 4.6% of the papers evaluated ergots and 1.6% analyzed opioids. The most frequent primary endpoint was the relief of the headache at a determinate moment, in 54.1%. Primary endpoint was evaluated at 2-h in 69.9% of the studies. Concerning other endpoints, tolerance was the most frequently addressed (83%), followed by headache relief (71.1%), improvement of other symptoms (62.5%) and presence of relapse (54%). The number of secondary endpoints increased from 4.2 (SD = 2.0) before 1991 to 6.39 after 2013 (p = 0.001). CONCLUSION: Headache relief has been the most employed primary endpoint but headache disappearance starts to be firmly considered. The number of secondary endpoints increases over time and other outcomes such as disability, quality of life and patients' preference are receiving attention.

Clinical characteristics and problems diagnosing autism spectrum disorder in girls.

BACKGROUND: Autism is a neurodevelopmental disorder with various clinical presentations. It has been historically considered a male disorder. An increasing number of authors stress the existence of sex/gender bias in prevalence and the need to define sex/gender differences in the clinical presentation. REVIEW: Recently, an increasing number of authors have studied the impact of sex/gender on autism's clinical presentation. The sex ratio of four boys to one girl commonly reported in literature is questioned. Sociocultural and familial influences can impact female clinical presentation as well as the way the difficulties of girls with autism are perceived. Issues of autism diagnostic instruments such as sex/gender bias are also studied since they have an impact on the access to diagnosis for girls. Clinical variability is a part of autism spectrum disorder, but some traits appear to be more specific of the female phenotype: existence of a "camouflage" phenomenon and less unusual play or restricted interests. DISCUSSION: Better understanding and diagnosis of females with autism is required to ensure the access to the support and treatment they need. Professionals must apprehend the sex/gender clinical differences to prevent the frequent misdiagnosis or missed diagnosis of females with autism. CONCLUSION: Pursuing research on sex/gender differences seems necessary to ensure appropriate support and diagnosis of undiagnosed females.

Are circadian rhythms new pathways to understand Autism Spectrum Disorder?

Autism Spectrum Disorder (ASD) is a frequent neurodevelopmental disorder. ASD is probably the result of intricate interactions between genes and environment altering progressively the development of brain structures and functions. Circadian rhythms are a complex intrinsic timing system composed of almost as many clocks as there are body cells. They regulate a variety of physiological and behavioral processes such as the sleep-wake rhythm. ASD is often associated with sleep disorders and low levels of melatonin. This first point raises the hypothesis that circadian rhythms could have an implication in ASD etiology. Moreover, circadian rhythms are generated by auto-regulatory genetic feedback loops, driven by transcription factors CLOCK and BMAL1, who drive transcription daily patterns of a wide number of clock-controlled genes (CCGs) in different cellular contexts across tissues. Among these, are some CCGs coding for synapses molecules associated to ASD susceptibility. Furthermore, evidence emerges about circadian rhythms control of time brain development processes.

[The emergency department: an appropriate place for identifying troubled teens]. / Les urgences, un lieu de repérage des adolescents en difficulté

OBJECTIVES: The main objective of this study was to estimate the prevalence of psychological distress among adolescents seen in emergency departments, and the secondary objective was to highlight their main reasons for consulting. METHODS: Cross-sectional study in three multicenter emergency departments receiving adolescents in Île-de-France conducted in 2010. All adolescents completed a questionnaire including the ADRS (Adolescent Depression Rating Scale, a screening questionnaire for depression) and a series of questions relating to somatization and risk behaviors. RESULTS: The study included 346 adolescents, 320 of which were fully analyzed. The ADRS score was considered normal (score < 3) for 70.6% of the sample (n = 226), 19.4% of adolescents (n = 62) had moderate depressive symptoms (3 ≤ score < 6), and 10.0% severe depressive symptoms (score ≥ 6) (n = 32). The majority of patients consulted for trauma and less than 10% for acute psychiatric problems; 17% of adolescents who came to the emergency department for a nonpsychiatric reason had an ADRS ≥ 3, i.e., with mental distress. CONCLUSION: The routine use of a self-administered questionnaire in the emergency services could identify adolescents with moderate to severe depressive symptoms.

Borderline personality disorder and mental healthcare service use among adolescents.

Borderline personality disorder (BPD) is believed to be frequent among adolescents. While several prospective studies have assessed the use of mental health services among adults who suffer from BPD, few studies have provided adolescent data. This paper presents findings from the first assessment point of the European Research Network on Borderline Personality Disorder (EURNET BPD) study. In this study, we describe lifetime treatment utilization for 85 adolescents with BPD (Mean age: 16.3 years old). In line with adult findings, adolescents with BPD reported greater mental healthcare service use (outpatient: 98%; inpatient: 79%) compared to controls. Phenothiazine, a sedative neuroleptic, was the most frequently prescribed treatment. 47% of patients had received psychotherapy; in one our of three cases this was psychodynamic therapy. Patients who had received psychotherapy did not differ on any psychopathological variables from those who did not receive psychotherapy; however, psychotherapy was more frequent among females.

Qualitative studies among obese children and adolescents: a systematic review of the literature.

Childhood obesity is a complex condition involving medical, social, moral and cultural issues. Qualitative approaches are of great value in understanding this complexity. This meta-synthesis of 45 qualitative studies deals specifically with the issue of obesity in children and adolescents from different perspectives--those of obese children and adolescents, of parents, and of health professionals providing support to the family. Our aim was to obtain a coherent view of child and adolescent obesity, focused on clinical and personal experience. The themes derived from the synthesis process fall under three main axes: 'Seeing others, seeing oneself', 'Understanding others, understanding oneself', and 'Treating others, treating oneself'. It emerges that participants in all three groups had equal difficulty in perceiving and labelling obesity, mainly because of their lack of any real common ground. The insufficiency of shared representations destabilizes the therapeutic relationship and its construction: an important issue in the doctor-child-parent relationship in this context is the need to exchange their viewpoints of obesity. Health workers may also expand their understanding of obesity by incorporating the personal experiences of obese children and their parents in order to match treatment plans to their needs and expectations.

Towards a more realistic picture of in situ biocide actions: combining physiological and microscopy techniques.

In this study, we combined chlorophyll a fluorescence (ChlaF) measurements, using pulse-amplitude-modulate (PAM) equipment, with scanning electron microscopy in backscattered electron mode (SEM-BSE) and transmission electron microscopy (TEM) images to evaluate the actions of Koretrel at lower concentrations on Verrucaria nigrescens colonising a dolostone. ChlaF measurements are good indicators of the damaging effects of biocides. However, these indicators only provide an incomplete view of the mechanism of biocides used to control biodeterioration agents. The death of the V. nigrescens photobiont at two biocide concentrations was revealed by PAM, SEM-BSE and TEM. Once Koretrel was applied, the Fv/Fm ratios markedly fell in the first few hours after the 1.5% treatment, and ratios for the 3% dilution remained close to zero throughout the study. The algal zone shows the plasmolysed appearance of the photobiont cells, and important aspects related to the action of the biocide on free and lichenised fungi were also detected using SEM-BSE. Many of the mycobiont cells had only their cell walls preserved; although, some fungal hyphae in lichen thalli and some microorganisms in endolithic clusters maintained lipid storage in their cytoplasm. These results indicated that the combination of physiological and microscopy techniques improves the assessment of biocide action in situ and this will help to optimize protocols in order to reduce the emission of these compounds to the environment.

The valence electronic structure and conformational flexibility of epichlorohydrin.

The electronic structure of epichlorohydrin is investigated in the whole valence region by a combined experimental and theoretical study. The issue of controversial assignments of the molecular electronic structure is here addressed. Photoelectron spectra (PES) and Threshold Photoelectron spectra (TPES) of room temperature molecules in the gas phase are recorded. Geometries and energies of the stable conformers due to internal rotation of the C-C-C-Cl dihedral angle, gauche-II (g-II), gauche-I (g-I), and cis, are calculated, and the effect of the conformational flexibility on the photoionization energetics is studied by DFT and 2h-1p Configuration Interaction (CI) methods. Strong breakdown of the Koopmans Theorem (KT) is obtained for the four outermost ionizations, which are further investigated by higher level ab initio calculations. The full assignment of the spectrum is put on a firm basis by the combination of experimental and theoretical results. The orbital composition from correlated calculations is found closer to the DFT orbitals, which are then used to analyze the electronic structure of the molecule. The Highest Occupied Molecular Orbital (HOMO) and HOMO--2 are n(O)/n(Cl) mixed orbitals. The nature of each valence MO is generally preserved in all the conformers, although the magnitude of the n(O)/n(Cl) mixing in HOMO and HOMO--2 varies to some extent with the C-C-C-Cl dihedral angle. The low energy part of the HOMO PE band is predicted to be substantially affected by the conformational flexibility, as experimentally observed in the spectra. The rest of the spectrum is described in terms of the dominant conformer g-II, and a good agreement between experiment and theory is found. The inner-valence PE spectrum is characterized by satellite structures, due to electron correlation effects, which are interpreted by means of 2h-1p CI calculations.

Enantioselective HF loss promoted by resonant two-photon ionization of supersonically expanded (R)-1-phenyl-2,2,2-trifluoroethanol clusters.

(R)-1-phenyl-2,2,2-trifluoroethanol and its hydrogen bonded adducts with achiral (water, tetrahydrofuran) and chiral solvent molecules ((R)- and (S)-butan-2-ol, (R)- and (S)-3-hydroxy-tetrahydrofuran) have been ionized by resonant two-photon absorption. The presence of photofragments, attributable to the occurrence of a hydrogen fluoride loss reaction, has been interpreted with the aid of theoretical predictions at the DFT level of theory with the inclusion of dispersive terms. The HF elimination process takes place by a mechanism involving the preliminary C(alpha)-H hydrogen transfer to an hydroxyl oxygen assisted by the solvent molecule which is followed by extrusion of the HF molecule. The calculated energy barriers depend on the type of solvent as well as on its configuration and are consistent with the observed fragmentation ratios.

Evolución del consumo de antibióticos y de la susceptibilidad antimicrobiana en el Centro Hospitalario Pereira Rossell en la era de Staphylococcus aureus resistente a meticilina / Antibiotic consumption and antimicrobial susceptibility evolution in the Centro Hospitalario Pereira Rossell in methicillin resistant Staphylococcus aureus era

Introduction: In the past few years, an increase in methicillin resistant-not multiresistant Staphylococcus aureus was observed in Uruguay among children with community acquired infections. Recommendations for empiric antibiotic treatment required adjustments and new national guidelines were recommended in July 2004. Adherence to these guidelines was indirectly performed by monitoring antibiotic consumption and antimicrobial susceptibility patterns in Uruguay. Objective: To describe and compare antibiotic consumption and antimicrobial susceptibility of Staphylococcus aureus in a Pediatric Hospital of the Centro Hospitalario Pereira Rossell (PH-CHPR) between 2001 and 2006. Methods: Antibiotic consumption in hospitalized children was calculated using the Defined Daily Dose per 100 bed-days (DDD/100). Reference valúes were obtained from the World Health Organization Collaborating Center for Drug Statistics Methodology of. Consumption. Data were obtained using the WinPharma programme of the Pharmacy Department of CHPR. The fraction of annual occupancy of hospital beds was obtained from the Statistic División of CHPR. Antibiotic consumption was evaluated netween 2001 and 2006 and expressed as DDD/100 and percent change. Antimicrobial susceptibility was evaluated using CHPR's Microbiology Laboratory data during the same time period. Results: After 2003 a significant increase in consumption of clindamycin, ceftriaxone, trimethoprim-sulphamethoxazole, cefuroxime, vancomycin and gentamycin was observed, except for cephradine. Consumption of clindamycin, ceftriaxone and trimethoprim-sulphamethoxazole showed the highest increase (6.15 percent; 1.44 percent and 1.17 percent respectively). Detection of Staphylococcus aureus increased significantly mostly from skin and soft tissue infections. Oxacillin susceptibility of S aureus strains obtained from different sites had a significant and persistent decrease after 2003 (from 81 percent during year ...

Introducción: En Uruguay, Staphylococcus aureus resistente a meticilina no multi-resistente se instaló como patógeno en las infecciones comunitarias del niño. Objetivo: Describir la evolución de la susceptibilidad in vitro de S. aureus y su relación con el consumo de antimicrobianos en el Centro Hospitalario Pereira Rossell (CHPR) entre 2001-2006. Metodología: Se estimó el consumo de antimicrobianos mediante el cálculo de la Dosis Diaria Definida por 100 camas-día. Los valores de referencia fueron obtenidos del Collaborating Centre for Drug Statistics Methodology of World Health Organiza-tion. Los datos de consumo fueron extraídos del programa WinFarma del Dpto de Farmacia de CHPR. El porcentaje de ocupación de camas/año se obtuvo de la División de Estadísticas del CHPR. Se analizó la susceptibilidad antimicrobiana de S. aureus de aislados de piel, tejidos blandos y sitios normalmente estériles. Se analizó la evolución del consumo y la susceptibilidad in vitro en el período 2001-2006. Resultados: Desde el año 2003, el consumo de clindamicina, ceftriaxona y cotrimoxazol aumentó y la susceptibilidad a oxacilina disminuyó significativamente. Entre 2004 y 2006 el "efecto D" disminuyó su frecuencia desde 28 a 21 por ciento. No se observaron diferencias en el patrón de susceptibilidad antimicrobiana en función del sitio de aislamiento. Conclusiones: Staphylococcus aureus resistente a meticilina no multi-resistente se ha introducido en forma significativa como un patógeno causante de infecciones en la comunidad en niños uruguayos. La vigilancia del consumo de antimicrobianos y de la epidemiología local es indispensable para actualizar las guías de antibioterapia empírica.

Spatial cognition based on geometry and landmarks in the domestic chick (Gallus gallus).

Recent evidence suggest that encoding of spatial information based on extended surfaces may differ from encoding based on discrete arrays of local elements. Here we investigated the use of these different frames of reference in domestic chicks. Chicks were trained to search for food hidden under sawdust in the center of the floor of a square-shaped landmark array, with its center in coincidence with the center of a square-shaped enclosure. Displacement of the array to a corner caused a shift of searching behavior toward the array, the search activity spanning between the center of the arena and the center of the array. After changing distances between landmarks, chicks still searched in the central area. Asymmetries were apparent in chicks tested in monocular conditions, with left-eyed chicks being more affected by the overall enclosure and right-eyed chicks by local landmarks. These results suggest that chicks can use both distances from extended surfaces and local information provided by the landmarks of the array to orient in space. However, chicks do not seem to perceive the array as a whole configuration, rather they tend to rely only on single landmarks to locate the goal.

Modelling neurotransmitter functions: a laser spectroscopic study of (1S,2S)-N-methyl pseudoephedrine and its complexes with achiral and chiral molecules.

Wavelength and mass resolved resonance-enhanced two photon ionization (R2PI) excitation spectra of (1S,2S)-N-methyl pseudoephedrine (MPE) and its complexes with several achiral and chiral solvent molecules, including water (W), methyl (R)-lactate (L(R)), methyl (S)-lactate (L(S)), (R)-2-butanol (B(R)), and (S)-2-butanol (B(S)), have been recorded after a supersonic molecular beam expansion and examined in the light of ab initio calculations. The spectral patterns of the selected complexes have been interpreted in terms of the specific hydrogen-bond interactions operating in the diastereomeric complexes, whose nature in turn depends on the structure and the configuration of the solvent molecule. The obtained results confirm the view that a representative neurotransmitter molecule, like MPE, "communicates" with the enantiomers of a chiral substrate through different, specific interactions. These findings can be regarded as a further contribution to modelling neurotransmitter functions in biological systems.

Chiral clusters in a supersonic beam: R2PI-TOF spectroscopy of diastereomeric carboxylic esters/(R)-(+)-1-phenyl-1-propanol complexes.

Wavelength and mass resolved resonance-enhanced two photon ionization (R2PI) excitation spectra of (R)-(+)-1-phenyl-1-propanol (P(R)) and its complexes with some chiral esters, i.e. methyl lactates (L(R) and L(S)), methyl 3-hydroxybutyrates (H(R) and H(S)), and methyl 2-chloropropionates (C(R) and C(S)), have been recorded after a supersonic molecular beam expansion and interpreted in the light of DFT calculations. The spectral features of the selected complexes were found to depend on the nature of hydrogen-bond interactions within the diasteromeric complexes, whose intensity in turn depends upon the structure and the configuration of the estereal moiety. The study further confirms resonant two-photon ionization spectroscopy, coupled with time-of-flight mass resolution (R2PI-TOF), as an excellent tool for gathering valuable information on the interactive forces in molecular clusters and for the enantiodiscrimination of chiral molecules in the gas phase.