Mesoporous Sn-In-MCM-41 Catalysts for the Selective Sugar Conversion to Methyl Lactate and Comparative Life Cycle Assessment with the Biochemical Process.

The use of biomass for the production of energy and higher added value products is a topic of increasing interest in line with growing environmental concerns and circular economy. Mesoporous material Sn-In-MCM-41 was synthesized for the first time and used as a catalyst for the transformation of sugars to methyl lactate (ML). This catalyst was characterized in depth by various techniques and compared with Sn-MCM-41 and In-MCM-41 catalysts. In the new Sn-In-MCM-41 material, both metals, homogeneously distributed throughout the mesoporous structure of MCM-41, actuate in a cooperative way in the different steps of the reaction mechanism. As a result, yields to ML of 69.4 and 73.9% in the transformation of glucose and sucrose were respectively reached. In the case of glucose, the ML yield 1.5 and 2.6 times higher than those of Sn-MCM-41 and In-MCM-41 catalysts, respectively. The Sn-In-MCM-41 catalyst was reused in the transformation of glucose up to four cycles without significant loss of catalytic activity. Finally, life cycle assessment comparison between chemical and biochemical routes to produce ML allowed us to conclude that the use of Sn-In-MCM-41 reduces the environmental impacts compared to Sn-MCM-41. Nevertheless, to make the chemical route comparable to the biochemical one, improvements in the catalyst and ML synthesis have to be achieved.

Cambio de régimen, cambio de paradigma / Regime change, paradigm shift

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Psychometric behaviour of the strengths and difficulties questionnaire (SDQ) in the Spanish national health survey 2006.

BACKGROUND: The Strengths and Difficulties Questionnaire (SDQ) is a tool to measure the risk for mental disorders in children. The aim of this study is to describe the diagnostic efficiency and internal structure of the SDQ in the sample of children studied in the Spanish National Health Survey 2006. METHODS: A representative sample of 6,773 children aged 4 to 15 years was studied. The data were obtained using the Minors Questionnaire in the Spanish National Health Survey 2006. The ROC curve was constructed and calculations made of the area under the curve, sensitivity, specificity and the Youden J indices. The factorial structure was studied using models of exploratory factorial analysis (EFA) and confirmatory factorial analysis (CFA). RESULTS: The prevalence of behavioural disorders varied between 0.47% and 1.18% according to the requisites of the diagnostic definition. The area under the ROC curve varied from 0.84 to 0.91 according to the diagnosis. Factor models were cross-validated by means of two different random subsamples for EFA and CFA. An EFA suggested a three correlated factor model. CFA confirmed this model. A five-factor model according to EFA and the theoretical five-factor model described in the bibliography were also confirmed. The reliabilities of the factors of the different models were acceptable (>0.70, except for one factor with reliability 0.62). CONCLUSIONS: The diagnostic behaviour of the SDQ in the Spanish population is within the working limits described in other countries. According to the results obtained in this study, the diagnostic efficiency of the questionnaire is adequate to identify probable cases of psychiatric disorders in low prevalence populations. Regarding the factorial structure we found that both the five and the three factor models fit the data with acceptable goodness of fit indexes, the latter including an externalization and internalization dimension and perhaps a meaningful positive social dimension.Accordingly, we recommend studying whether these differences depend on sociocultural factors or are, in fact, due to methodological questions.

Self-reported chronic mental health problems and mental health service use in Spain.

OBJECTIVES: To determine the prevalence of self-reported chronic mental health problems (MHPs) and mental health service use and their determinants, among the Spanish population over 14 years of age. METHODS: Data from the 1999 Spanish Survey on Disabilities, Deficiencies, and State of Health were used. The survey is a cross-sectional study based on a multi-stage stratified sample of all the non-institutionalized Spanish population aged over 14 years (n=59,101, 11% non-responders). Multivariate logistic regression analysis were used. RESULTS: 10.7% of the Spanish population suffer from an MHP. The highest prevalences were found in women, divorced/separated persons, those with a lower level of education and income, and those suffering from a chronic somatic problem. The number of days of daily activity lost was 2-fold greater among those with an MHP than among those with a chronic somatic problem. Greater use of mental health services was associated with loss of daily activity, having a higher level of education, invalidity or disability. The probability of MHP being referred from primary to mental healthcare is reduced if somatic comorbidity is present. CONCLUSION: MHPs have a high prevalence and a significant repercussion on the patient's life. An inverse relationship was found between certain risk factors for MHPs and the use of services, which suggests inequality. Problems of accessibility are identified.

Investigación cualitativa y psiquiatría / Qualitative research and psychiatry

Los métodos cuantitativos de investigación son hegemónicos en nuestra especialidad. Sin embargo en los últimos tiempos se detecta una reintroducción de las técnicas cualitativas. Con esto se recupera una prestigiosa tradición que no ha desaparecido del todo en psiquiatría. Las técnicas cualitativas trabajan en un entorno natural, utilizando observaciones o transcripciones. Buscan el significado, entender el "qué". No asumen que los sujetos son objetos. Siguen un curso inductivo. Asimismo, en el presente artículo se analizan los motivos del descontento con los métodos cuantitativos, se exploran las aportaciones que el uso de los métodos cualitativos ha hecho al cuerpo doctrinal de la psiquiatría, se revisan los lugares por donde lo cualitativo vuelve a hacerse presente y, finalmente, se trata de dilucidar las ventajas y las limitaciones del uso de estas técnicas (AU)