The Bradyrhizobium Sp. LmicA16 Type VI Secretion System Is Required for Efficient Nodulation of Lupinus Spp.

Many bacteria of the genus Bradyrhizobium are capable of inducing nodules in legumes. In this work, the importance of a type VI secretion system (T6SS) in a symbiotic strain of the genus Bradyrhizobium is described. T6SS of Bradyrhizobium sp. LmicA16 (A16) is necessary for efficient nodulation with Lupinus micranthus and Lupinus angustifolius. A mutant in the gene vgrG, coding for a component of the T6SS nanostructure, induced less nodules and smaller plants than the wild-type (wt) strain and was less competitive when co-inoculated with the wt strain. A16 T6SS genes are organized in a 26-kb DNA region in two divergent gene clusters of nine genes each. One of these genes codes for a protein (Tsb1) of unknown function but containing a methyltransferase domain. A tsb1 mutant showed an intermediate symbiotic phenotype regarding vgrG mutant and higher mucoidity than the wt strain in free-living conditions. T6SS promoter fusions to the lacZ reporter indicate expression in nodules but not in free-living cells grown in different media and conditions. The analysis of nodule structure revealed that the level of nodule colonization was significantly reduced in the mutants with respect to the wt strain.

Epigenetic control of the EWS­FLI1 promoter in Ewing's sarcoma.

Ewing sarcoma (ES) is a primary bone marrow tumor that very rarely develops in extra­osseous tissues, such as lung. The hallmark of ES tumors is a translocation between chromosomes 11 and 22, resulting in a fusion protein, commonly referred to as EWS­FLI1. The epigenetic profile (histone acetylation and methylation enrichment of the promoter region) that may regulate the expression of the aberrant transcription factor EWS­FLI1, remains poorly studied and understood. Knowledge of epigenetic patterns associated with covalent histone modification and expression of enzymes associated with this process, can contribute to the understanding of the molecular basis of the disease, as well as to the identification of possible molecular targets involved in expression of the EWS­FLI1 gene, so that therapeutic strategies may be improved in the future. In the present study, the transcriptional activation and repression of the EWS­FLI1 fusion gene in ES was accompanied by selective deposition of histone markers on its promoter. The EWS­FLI1 fusion gene was evaluated in two patients with ES using conventional cytogenetic, fluorescence in situ hybridization and nested PCR assays, which revealed that the aberrant expression of the EWS­FLI1 gene is accompanied by enrichment of H3K4Me3, H3K9ac and H3K27ac at the promoter region.

[Contingency plan for the intensive care services for the COVID-19 pandemic]. / Plan de contingencia para los servicios de medicina intensiva frente a la pandemia COVID-19.

In January 2020, the Chinese authorities identified a new virus of the Coronaviridae family as the cause of several cases of pneumonia of unknown aetiology. The outbreak was initially confined to Wuhan City, but then spread outside Chinese borders. On 31 January 2020, the first case was declared in Spain. On 11 March 2020, The World Health Organization (WHO) declared the coronavirus outbreak a pandemic. On 16 March 2020, there were 139 countries affected. In this situation, the Scientific Societies SEMICYUC and SEEIUC have decided to draw up this Contingency Plan to guide the response of the Intensive Care Services. The objectives of this plan are to estimate the magnitude of the problem and identify the necessary human and material resources. This is to provide the Spanish Intensive Medicine Services with a tool to programme optimal response strategies.

Reflections arising from the COVID-19 pandemic. / Reflexiones derivadas de la pandemia COVID-19.

While we were drafting the recommendations for the joint contingency plan between the Spanish Society of Intensive Care and Coronary Unit Nursing (SEEIUC) and the Spanish Society of Intensive and Critical Care Medicine and Coronary Units (SEMICYUC), predictions were overtaken by events with regard to the magnitude of the COVID-19 pandemic. Members informed us of the lack of personal protection equipment (PPE), the rapid provision of improvised ICUs in various hospital areas and the recruitment of nurses to cover shifts. The failure to recognise the specialty of critical care nursing, included in the macro-specialty of medical-surgical nursing and not yet developed, has highlighted the urgent need to learn from our mistakes: specialisation, increase the number of nurses in teams and protect the public health system.

Physical restraint in critical care units from the experience of doctors and nursing assistants: In search of an interdisciplinary interpretation. / La contención mecánica en unidades de cuidados críticos desde la experiencia de los médicos y técnicos en cuidados auxiliares de enfermería: buscando una lectura interdisciplinar.

OBJECTIVES: The study aim was to explore the experience of doctors and nursing assistants in the management of physical restraint (PR) in critical care units. METHOD: A multicentre phenomenological study that included 14 critical care units (CCU) in Madrid (Spain). The CCU were stratified according to their use of physical restraint: "frequently used" versus "seldom used". Three focus groups were formed: the first comprised nursing assistants from CCUs that frequently used physical restraint, the second comprised nursing assistants from CCUs that seldom used physical constraint, and the final group comprised doctors from both CCU subtypes. Sampling method: purposive. DATA ANALYSIS: thematic content analysis. Data saturation was achieved. RESULTS: Four principle themes emerged: 1) concept of safety and risk (patient safety versus the safety of the professional), 2) types of restraint, 3) professional responsibilities (prescription, recording, and professional roles) and 4) "zero restraint" paradigm. The conceptualisation regarding the use of physical contentions shows differences in some of the principal themes, depending on the type of CCU, in terms of policies, use and management of physical constraint (frequently used versus seldom used). CONCLUSIONS: The real reduction in the use of physical restraint in CCU must be based on one crucial point: acceptance of the complexity of the phenomenon. The use of physical restraint observed in the different CCU is influenced by individual, group and organisational factors. These factors will determine how doctors and nursing assistants interpret safety and risk, the centre of care (patient or professional-centred care), the concept of restraint, professional responsibilities and interventions, interactions of the team and the leadership.

Phenolic and tannin compounds in subtropical shrubs (Bituminaria bituminosa, Chamaecytisus proliferus, and Adenocarpus foliosus) and the effects on in vitro digestibility.

The objective of this study was to contribute to the characterization of nutritional potentials, with special attention to the total phenol and condensed tannins content and the effects on in vitro digestibility of some browsing shrub legumes traditionally used for ruminant feeding. The varieties selected were Bituminaria bituminosa var. bituminosa (BBB), Bituminaria bituminosa var. albormaginata (BBA), Chamaecytisus proliferus var. palmensis (CPP), Chamaecytisus proliferus var. canariae (CPC), and Adenocarpus foliosus (AF). Chemical composition, in vitro digestibility, and net energy for lactation (NE) were analyzed and compared among varieties; the effects of total phenol (TP) and condensed tannins (CT) compounds on digestibility were estimated. Condensed tannins ranged from 1 to 5 g/kg DM of tannins, while total phenols ranged from 9 to 32 g/kg DM of tannins. In vitro organic matter digestibility (OMD) ranged from 0.52 to 0.71, and estimated net energy for lactation (NE) ranged from 4.2 to 5.8 MJ/kg DM, with significant differences among all the varieties. This Chamaecytisus varieties (CPC, CPP) have higher feeding values, following CPC > CPP > AF > BBB > BBA in order. Although there were condensed tannins and total phenols in all the shrubs analyzed, total phenol contents differed significantly between the shrubs. The effect of the content of the total phenols and of the tannins condensed in the OMD of the varieties of shrubs analyzed, shows that the higher amounts of total phenols in some of the varieties of shrubs analyzed, increased the in vitro digestibility (OMD) of the shrubs but high amounts of CT decreased OMD.

Diagnóstico bioquímico de la hiperglicinemia no cetósica en Cuba / Biochemical diagnosis of nonketotic hyperglycinemia in Cuba

No disponible

Effects of replacing rye-grass (Lolium spp.) hay by banana (Musa acuminata L.) by-products on feed intake, growth, and feed conversion rate of Canary hair sheep breed (Pelibuey) lambs.

The objective of this study was to evaluate the effects of replacing rye-grass (Lolium spp.) hay with banana (Musa acuminata L.) by-products on feed intake, average daily gain (ADG), and feed conversion rate (FCR) in Pelibuey (hair sheep breed) lambs. The lambs (n = 22; initial BW = 14.8 ± 2.5 kg) were individually housed and fed on two different types of diet for 58 days: the first group (experimental diet) received as forage a mixture of fresh banana by-products composed of leaves and pseudostem. The second group received commercial rye-grass hay (conventional diet) as a fiber source. Both groups received a supplementary commercial concentrate food. The total daily forage intake and FCR were lower (P < 0.001) in animals fed on the conventional diet (rye-grass hay) than animals fed on the experimental diet (banana by-products). However, there were no significant differences in total dry matter intake, total digestible energy intake, total body weight gain, and ADG between the two groups. The results obtained in this study suggest that banana by-products could be used as alternative forage for Pelibuey lambs raised in subtropical conditions.

Características clínicas y sociodemográficas de pacientes con diabetes tipo 1 en un Hospital Universitario de Colombia / Clinical and sociodemographic characteristics of patients with diabetes mellitus type 1 in a University Hospital of Colombia

Resumen ANTECEDENTES: La diabetes mellitus tipo 1 es una enfermedad autoinmunitaria causada por la interacción de múltiples factores ambientales y genéticos que conducen a la destrucción autoinmunitaria de células B pancreáticas productoras de insulina. La incidencia y prevalencia de la diabetes mellitus tipo 1 varían considerablemente en todo el mundo. OBJETIVO: Establecer las características clínicas y sociodemográficas de los pacientes con diabetes mellitus tipo 1. MATERIAL Y MÉTODO: Estudio descriptivo de corte transversal y retrospectivo en el que se incluyeron pacientes con diabetes tipo 1 que ingresaron a un hospital universitario de Colombia en el periodo comprendido entre 2012 y 2016. Posteriormente se realizó análisis estadístico según las variables. RESULTADOS: La prevalencia intrahospitalaria de la diabetes mellitus tipo 1 fue de 19 casos por cada 100,000 pacientes mayores de 13 años. Fue más frecuente en mujeres con 61.3%, la edad promedio al diagnóstico fue de 14.89 años. El diagnóstico se estableció de forma clínica sin estudios de autoinmunidad, se trataba de pacientes con enfermedad no controlada con HbA1c promedio de 11.5%, las complicaciones más frecuentes fueron la cetoacidosis diabética con 46.6%, al igual que la hipoglucemia. La insulina más frecuentemente prescrita en este grupo de pacientes fue glargina, glulisina y e insulina regular. CONCLUSIÓN: Los hallazgos sugieren que algunas características de la diabetes mellitus tipo 1 podrían ser similares y algunas diferentes a lo reportado en otros estudios; sin embargo, pueden plantearse algunas posibles investigaciones tomando estos resultados como base.

Abstract BACKGROUND: Diabetes mellitus type 1 is an autoimmune disease caused by the interaction of multiple environmental and genetic factors leading to the autoimmune destruction of pancreatic B cells producers of insulin. The incidence and prevalence of diabetes mellitus type 1 vary considerably all around the world. OBJECTIVE: To establish the clinical and socio-demographic characteristics of diabetes mellitus type 1. MATERIAL AND METHOD: A descriptive, cross-sectional and retrospective study that included patients with diabetes type 1 who entered to a university hospital of Colombia from 2012 to 2016. Then, a statistical analysis was done according to variables. RESULTS: Intrahospitalary prevalence of diabetes mellitus type 1 was of 19 cases for each 100,000 patients older tan 13 years. It was more frequent in women with 61.3%; the mean age at diagnosis was of 14.89 years. Diagnosis was established in a clinical manner without autoimmunity studies, they were patients with not-controlled disease with a mean HbA1c of 11.5%; the frequent complications were: diabetic cetoacidosis with 46.6%, as well as hypoglycemia. The most frequently prescribed insulin in these patients was glargine, glulisine and regular insulin. CONCLUSIONS: The findings suggest that some characteristics of diabetes mellitus 1 could be similar and some different to that reported in other studies; however, some possible investigations may be considered taking these results as basement.

Emotion-regulation ability, role stress and teachers' mental health.

BACKGROUND: Work-related stressors, including role ambiguity and role conflict, are related to psychological maladjustment and mental ill-health. However, to date, the role of personal resources such as emotion-regulation ability (ERA) in the prediction of mental health indicators has not been addressed. AIMS: To examine whether ERA would contribute to explaining teachers' depression, anxiety and stress symptoms beyond role ambiguity and role conflict. METHODS: We carried out a cross-sectional questionnaire survey. We used a correlation matrix and hierarchical regression models to analyse the data. RESULTS: Three hundred and thirty-six Spanish teachers (185 female) from several grade levels completed the surveys (40% response rate). Role ambiguity and role conflict were positively related to depression, anxiety and stress symptoms. ERA was negatively related to teachers' scores on depressive, anxious and stress symptoms, with predictive power above the main effects of role ambiguity and role conflict. An interaction between role ambiguity and ERA was also significant in predicting depression. CONCLUSIONS: Our study provides preliminary evidence suggesting the development of integrative models considering work-related stressors along with personal resources such as ERA aiming to prevent teachers' mental ill-health. Future studies should examine the influence of ERA on psychological symptoms using longitudinal designs.

Targeting expression to megakaryocytes and platelets by lineage-specific lentiviral vectors.

Essentials Platelet phenotypes can be modified by lentiviral transduction of hematopoietic stem cells. Megakaryocyte-specific lentiviral vectors were tested in vitro and in vivo for restricted expression. The glycoprotein 6 vector expressed almost exclusively in megakaryocytes. The platelet factor 4 vector was the strongest but with activity in hematopoietic stem cells. SUMMARY: Background Lentiviral transduction and transplantation of hematopoietic stem cells (HSCs) can be utilized to modify the phenotype of megakaryocytes and platelets. As the genetic modification in HSCs is transmitted onto all hematopoietic progenies, transgene expression from the vector should be restricted to megakaryocytes to avoid un-physiologic effects by ectopic transgene expression. This can be achieved by lentiviral vectors that control expression by lineage-specific promoters. Methods In this study, we introduced promoters of megakaryocyte/platelet-specific genes, namely human glycoprotein 6 (hGP6) and hGP9, into third generation lentiviral vectors and analyzed their functionality in vitro and in vivo in bone marrow transplantation assays. Their specificity and efficiency of expression was compared with lentiviral vectors utilizing the promoters of murine platelet factor 4 (mPf4) and hGP1BA, both with strong activity in megakaryocytes (MKs) used in earlier studies, and the ubiquitously expressing phosphoglycerate kinase (hPGK) and spleen focus forming virus (SFFV) enhancer/promoters. Results Expression from the mPf4 vector in MKs and platelets was the strongest similar to expression from the viral SFFV promoter, however, the mPf4 vector, also exhibited considerable off-target expression in hematopoietic stem and progenitor cells. In contrast, the newly generated hGP6 vector was highly specific to megakaryocytes and platelets. The specificity was also retained when reducing the promoter size to 350 bp, making it a valuable new tool for lentiviral expression in MKs/platelets. Conclusion MK-specific vectors express preferentially in the megakaryocyte lineage. These vectors can be applied to develop murine models to study megakaryocyte and platelet function, or for gene therapy targeting proteins to platelets.

Alteraciones tiroideas: ¿Predictores de mortalidad en Cuidados Intensivos? / Thyroid disorders: Predictors of mortality in Intensive Care?

Introducción: El objetivo del estudio es describir y analizar la función tiroidea en el paciente crítico. Describir si algún patrón se asocia a una mayor tasa de mortalidad. Métodos: Se analizó a todos los pacientes ingresados en nuestra Unidad de Cuidados Intensivos, entre enero de 2015 y agosto de 2016, y que permanecieron allí, al menos, siete días. Resultados: Se incluyeron 242 pacientes. Se hallaron diferencias significativas en los valores medios de los índices de gravedad entre los no supervivientes y los supervivientes: SOFA (10,45 vs. 7,9); APACHE II (24,42 vs. 20,71); SAPS II (63,14 vs. 50,69). Se encontraron diferencias estadísticamente significativas en los valores medios de T3 en el grupo de supervivientes y no supervivientes: 1,5 pg/ml vs. 1,15 pg/ml (p <0,001; IC95% 0,224 ± 0,487). No hubo diferencias estadísticamente significativas en los valores medios de T4 y TSH. Al realizar el subanálisis según grupo de ingreso, no se hallaron diferencias estadísticamente significativas entre las cifras de TSH, T3 o T4. Sí hubo diferencias significativas en los valores medios de T3 en la mayor parte de los subgrupos. Conclusiones: Se hallaron diferencias estadísticamente significativas entre los valores medios de T3 en el grupo de supervivientes y no supervivientes. Los valores de T3 parecen asociarse a la mortalidad. Su descenso no parece asociarse a la enfermedad subyacente, sino a su gravedad.(AU)

Introduction: The aim of this study is to describe and analyse the thyroid function in the critically ill patient, and to describe if any pattern is associated with a higher mortality rate. Methods: Patients admitted to the Intensive Care Unit, between January 2015 and August 2016, with a stay of seven days or more, were enrolled. Results: Two hundred and forty-two patients were included. Significant differences were observed in the severity scores related to mortality during their stay in the Intensive Care Unit (no survivors vs. survivors): SOFA (10.45 vs. 7.9); APACHE II (24.42 vs. 20.71); SAPS II (63.14 vs. 50.69). Statistically significant differences were observed in the mean values of T3 between survivors and non-survivors: 1.5 pg/ml vs. 1.15 pg/ml (p <0.001; CI95% 0.224 ± 0.487). There were no statistically significant differences in the mean values of T4 and TSH. After subgroup analysis according to the admission group, no significant differences among the TSH, T3 and T4 values were detected. However a statistically difference in T3 average value was found in most subgroups. Conclusions: A statistically significant difference was found in mean T3 values in survivors and non-survivors. T3 concentration appears to be associated with mortality. Decrease of this thyroid hormone does not seem to associate with the underlying disease, but with its severity.(AU)

[Therapeutic restraint management in Intensive Care Units: Phenomenological approach to nursing reality]. / Manejo de la inmovilización terapéutica en Unidades de Cuidados Críticos: aproximación fenomenológica a la realidad enfermera.

AIMS: To identify nursing experience on physical restraint management in Critical Care Units. To analyse similarities and differences in nursing experience on physical restraint management according to the clinical context that they are involved in. METHOD: A multicentre phenomenological study was carried out including 14 Critical Care Units in Madrid, classified according to physical restraint use: Common/systematic use, lacking/personalised use, and mixed use. Five focus groups (23 participants were selected following purposeful sampling) were convened, concluding in data saturation. Data analysis was focused on thematic content analysis following Colaizzi's method. FINDINGS: Six main themes: Physical restraint meaning in Critical Care Units, safety (self-retreat vital devices), contribution factors, feelings, alternatives, and pending issues. Although some themes are common to the 3 Critical Care Unit types, discourse differences are found as regards to indication, feelings, systematic use of pain and sedation measurement tools. CONCLUSIONS: In order to achieve real physical restraint reduction in Critical Care Units, it is necessary to have a deep understanding of restraints use in the specific clinical context. As self-retreat vital devices emerge as central concept, some interventions proposed in other settings could not be effective, requiring alternatives for critical care patients. Discourse variations laid out in the different Critical Care Unit types could highlight key items that determine the use and different attitudes towards physical restraint.

Sección de Perinatología. Servicio de Pediatría del Hospital Universitario Cruces / Perinatology section: pediatrics department of the Hospital Universitario Cruces

En este artículo se presenta la organización, la actividad asistencial, docente y de investigación y los índices de calidad de la Sección de Perinarología del Hospital Universitario Cruces (HU Cruces). Se trata de un proceso multidisciplinar que tiene como principal objetívo contribuir a mantener y, si es posible, mejorar la calidad de la atención sanitaria del recién nacido (RN) y su madre, contando con la implicación y participación de todo e! personal sanitario de la Sección y en coordinación con otras áreas asistenciales (Unidad de Medicina Perinatal, Unidad de Medicina Fetal y Unidad Neonatal) y especialistas. Se describirá nuestra actual Cartera de Servicios y las estrategias de mejora para favorecer la información prenatal, la asistencia especializada a partos de riesgo y e! control posnatal, tanto de los RN aparentemente sanos, como de los que requieran una adaptación especial o un control multidisciplinar postnatal, promocionando y favoreciendo la inseparabilidad de la madre y su hijo de manera segura y la lactancia materna (LM) (AU)

This paper presents the Organization, the Quality Indexes and the Health Care, Teaching and Research activities of the Perinatology Section at Cruces University Hospital. The paper holds a multidisciplinary perspective and its main objective is to help to maintain and, if possible, improve newborns and mothers' health care quality, relying on the participation of all the health care workers in the Section and on the coordination with other care areas (Unit of Perinatal Medicine, Fetal Medicine Unit and Neonatal Unit) and specialists. Our current service portfolio will be presented together with suggestions of improvement strategies leading to the following objectives: prenatal information improvement, specialized care for risk births, postnatal control, related both to apparently healthy newborns and to those requiring special adaptation or a multidisciplinary postnatal control, and the encouragement of safe mother-child inseparability and breastfeeding (AU)

Non-inferiority trial between two dry-powder inhalers containing fluticasone/salmeterol in asthmatic patients.

Asthma is an increasing pathology with poor compliance. Achievement of control is possible but under intensive treatment. In this setting, fluticasone/salmeterol association delivered by dry powder inhalers is a valuable and proved option. A prospective, parallel, open-label, phase IV, multicentre non-inferiority study was conducted to determine therapeutic similarity between 2 different inhalers: Generic DPI and Diskus®, which both deliver a fluticasone/salmeterol association (CAS 80474-14-2/CAS 89365-50-4). A 103 uncontrolled asthmatic patients were randomly assigned in 2 groups, Generic (G) and Diskus® (D), and received the association for 18 weeks through the appropriate device. They were evaluated according to Asthma Quality of Life Questionnaire and GINA/NIH guidelines. To demonstrate non-inferiority, the estimation of the Relative Risk between the Global Score Rate per group with its 95% confidence interval was calculated and compared against a non-inferiority margin obtained from a previous study. The Global Score Rate was 82% for G Group and 83% for D Group. The RR was 1.0124 (95% CI: 0.847-1.210). The margin set at 0.832 was not reached by the lower 95% CI (z=-2.097; p=0.018) pointing out non-inferiority. The results have demonstrated non-inferiority between groups. Thus, the 2 products are therapeutically similar.

Genetic diversity of indigenous rhizobial symbionts of the Lupinus mariae-josephae endemism from alkaline-limed soils within its area of distribution in Eastern Spain.

The genomic diversity of a collection of 103 indigenous rhizobia isolates from Lupinus mariae-josephae (Lmj), a recently described Lupinus species endemic to alkaline-limed soils from a restricted habitat in Eastern Spain, was investigated by molecular methods. Isolates were obtained from soils of four geographic locations in the Valencia province that harbored the known Lmj plant populations. Using an M13 RAPD fingerprinting technique, 19 distinct RAPD profiles were identified. Phylogenetic analysis based on 16S rDNA and the housekeeping genes glnII, recA and atpD showed a high diversity of native Bradyrhizobium strains that were able to establish symbiosis with Lmj. All the strains grouped in a clade unrelated to strains of the B. canariense and B. japonicum lineages that establish symbioses with lupines in acid soils of the Mediterranean area. The phylogenetic tree based on concatenated glnII, recA and atpD gene sequences grouped the Lmj isolates in six different operational taxonomic units (OTUs) at the 93% similarity level. These OTUs were not associated to any specific geographical location, and their observed divergence predicted the existence of different Bradyrhizobium genomic species. In contrast, phylogenetic analysis of symbiotic genes based on nodC and nodA gene sequences, defined only two distinct clusters among the Lmj strains. These two Lmj nod gene types were largely distinct from nod genes of bradyrhizobia nodulating other Old World lupine species. The singularity and large diversity of these strains in such a small geographical area makes this an attractive system for studying the evolution and adaptation of the rhizobial symbiont to the plant host.

Proton transfer and photoluminescence intermittency of single emitters in dyed crystals.

The role of proton transfer in the photoluminescence intermittency (PI) of single molecules of violamine R (VR) overgrown in potassium acid phthalate (KAP) crystals is evaluated in comparisons of protonated (KAP) and deuterated (DKAP) mixed crystals between 23 and 60 °C. The PI is analyzed by the construction of cumulative distribution functions that are statistically compared. We find that the on- and off-interval duration distributions change with isotopic substitution consistent with proton transfer contributing to the PI of VR. The on- and off-interval duration distributions have distinct temperature dependencies consistent with different mechanisms for dark state production and decay. Additional evidence for proton-transfer is provided by distributions of single molecule emission-energy maxima that reflect emission from protonated and deprotonated VR. A mechanism for the PI of KAP is presented, where the dark state is assigned to formation of the colorless, leuco form of VR, formed by proton transfer from VR to the KAP lattice, and decay of the dark state involves ring-opening promoted by proton transfer from KAP to VR. The distributed kinetics for dark-state production and decay are modeled using a log-normal distribution for the PI data in preference to a power-law previously assumed. A discussion of the log-normal distribution with regards to PI and proton transfer is presented.

Utilización de sustancias psicoactivas en alumnos de anatomía y su implicación en el aprendizaje / The use of psychoactive substances in Anatomy students and its implication in learning

Introducción. Es conocido que, para aumentar el rendimiento cognitivo, numerosos estudiantes recurren a sustancias con el objetivo de estar más horas despiertos con la atención agudizada para estudiar. Pero dichas sustancias interfieren en la memoria y pueden generar farmacodependencia. Objetivo. Establecer la frecuencia de uso de sustancias psicoactivas en universitarios y su relación con características de sueño, socioeconómicas y educativas. Sujetos y métodos. Estudio observacional transversal mediante una encuesta estandarizada, normalizada y anónima, con sistema de elección múltiple, a 122 alumnos de anatomía en el año 2009. Se aplicaron parámetros estadísticos y se exigió el consentimiento informado. Resultados. El 79,51% refirió no llegar a leer todos los temas y el 36,89% refirió haber memorizado conceptos. El 25% comenzó a memorizar términos tres días antes del examen; un 20,49% comenzó el día anterior, y el 19,67%, la noche anterior y luego acudió al examen sin haber dormido. El 25,41% respondió que tomaba sustancias para dormir y el 41,8% alguna sustancia para aumentar las horas de estudio; destacaban el café, las bebidas energizantes, psicofármacos (45,09%, principalmente modafinilo y metilfenidato) y ácido acetilsalicílico. El número de horas trabajadas por día se correlacionó con el número de sustancias consumidas (r = 0,89); los repetidores de la asignatura refirieron menor cantidad de horas de sueño, indirectamente correlativas con el uso de psicoactivos (r = –0,86). Conclusiones. Registramos una alta prevalencia de consumo de sustancias psicoactivas, especialmente en repetidores de la asignatura y alumnos con actividades laborales. Es de suma importancia implementar herramientas pedagógicas para aumentar las capacidades motivacionales, atencionales y asociativas bajo una concepción integradora-educacional (AU)

Introduction. It is well-known that to increase their cognitive performance, many students turn to substances with the objective of being able to stay up more hours with a sharp attention focused on their study. However, these substances can interfere long term memory and can generate pharmaceutical dependency. Aim. To establish the prevalence of the use of psychoactive substances in University students and to relate it with sleeping patterns and social-economic-educational characteristics. Subjects and methods. Cross-sectional study using standardized questionnaire with multiple choice system administered to 122 Anatomy students in the year 2009. Statistic parameters were applied and an informed consent was demanded. Results. 79.51% said that they were not able to read all the topics and 36.89% said that they memorized concepts; 25% started to memorize subjects three days before the exam, 20.49% did it the previous day, and 19.67% memorized subjects the night before the exam without sleeping. 25.41% answered that they used substances for sleeping and 41.8% used some substances to increase studying hours, such as: coffee, energy drinks, psychopharmacological medication (45.09% modafinil and methylphenidate) and acetylsalicylic acid. The numbers of hours working correlated with the number of substances consumed (r = 0.89); students that where taking the subject again had less hours of sleep indirectly correlated with the use of psychoactives (r = –0.86). Conclusions. We recorded a high prevalence of consumptions of psychoactive substances, especially amongst students that are repeating the course and students that had jobs. It is of utmost importance to implement pedagogical tools that increase motivation, attention, and the associative capacities under an integrative-educational conception (AU)

Social support from health care providers is associated with reduced illness intrusiveness in hemodialysis patients.

BACKGROUND: End-stage renal disease (ESRD) disrupts patients' life styles, interests and activities negatively affecting their quality of life. Social support has been previously associated with favorable health outcomes. However, no study has examined the association of social support from health care providers with perceived health and ESRD intrusiveness on patients' lives. METHODS: A self-administered questionnaire was completed by 1,238 Italian hemodialysis patients. The Self-Rated Health (SRH) and the Illness Intrusiveness Rating Scale (IIRS) assessed disease burden. 10 items assessed social support from health care providers (SS-HC). The nursing staff of each center provided patients' clinical information. Linear regression was used to assess correlates of SRH and IIRS. Mediational analysis was used to assess direct and indirect associations of SS-HC with SRH through IIRS. RESULTS: Higher SS-HC was associated with smaller IIRS and higher SRH. Further correlates of better SRH were younger age, no post-dialysis hypotension, no diabetes and cardiovascular diseases, better sleep quality, and smaller burden of oral therapy. CONCLUSIONS: Our results suggest that social support might reduce illness burden and improve patients' perceived health. Further research should assess the efficacy and cost-effectiveness of structured support programs for dialysis patients.