Partial Purification and Characterization of the Mode of Action of Enterocin S37: A Bacteriocin Produced by Enterococcus faecalis S37 Isolated from Poultry Feces

The aim of this research was to purify and characterize the mode of action of enterocin S37, a bacteriocin produced by Enterococcus faecalis S37, a strain recently isolated from the chicken feces. Enterocin S37 has a molecular weight comprised between 4 and 5 kDa. It remained active after 1 h at 80oC and at pH values ranging from 4.0 to 9.0. Furthermore, cell-free supernatant of Enterococcus faecalis S37 and purified enterocin S37 were active against Gram-positive bacteria including Listeria monocytogenes EGDe, L. innocua F, Enterococcus faecalis JH2-2, and Lactobacillus brevis F145. The purification of enterocin S37 was performed by ammonium sulfate precipitation followed up by hydrophobic-interaction chromatography procedures. Treatment of enterocin S37 with proteinase K, α-chymotrypsin, and papain confirmed its proteinaceous nature, while its treatment with lysozyme and lipase resulted in no alteration of activity. Enterocin S37 is hydrophobic, anti-Listeria and likely acting by depletion of intracellular K+ ions upon action on KATP channels. This study contributed to gain more insights into the mode of action of enterocins

Patients who benefit from psychiatric admission in the general hospital

OBJECTIVES: Psychiatric hospitalization though burdensome remains a very important therapeutic option for severely-ill psychiatric patients. Hospitalization in general hospital psychiatry units (GHPU) are often regarded as the best option. A study was carried out with the purpose of assessing socioeconomic and medical variables associated with success and failure of hospitalization. METHODS: A review was performed on sociodemographics and medical data of 1,463 patients admitted to a general hospital's GHPU in the period between 1986 and 1997. Statistical analysis was conducted using univariate and multivariate polythomic logistic regression. RESULTS: In the multivariate analysis three factors were identified as associated to poor hospitalization outcomes (poor condition at discharge and longer hospital stay): age >60 years, poor social functioning, and diagnosis of organic mental disorder. CONCLUSIONS: Although 80% of the patients experienced a considerable symptomatic improvement, a small group benefited less from hospitalization. It is suggestive that these patients would benefit more from psychosocial interventions.OBJETIVO: A internação psiquiátrica, embora onerosa, continua sendo um recurso terapêutico indispensável para pacientes graves. A internação em unidades psiquiátricas de hospital geral (UPHG) tem sido recomendada como a melhor alternativa aos macro-hospitais psiquiátricos. Nesse sentido, realizou-se estudo com o objetivo de verificar variáveis socioeconômicas e clínicas associadas com o êxito ou o fracasso da internação. MÉTODOS: Foram revistos dados sociodemográficos e clínicos de 1.463 pacientes internados em uma UPHG de hospital geral no período 1986-1997, utilizando-se análise de regressão logística politômica univariada e multivariada. RESULTADOS: Por meio da análise multivariada, foram identificados três fatores associados a um pior desfecho da internação (condição de alta ruim e maior tempo de permanência): idade >60 anos, não exercício prévio de função social e diagnóstico de transtorno psicorgânico. CONCLUSÃO: Embora mais de 80% dos pacientes tratados nessa UPHG tenham apresentado significativa melhora dos sintomas, um subgrupo se beneficiou menos da internação, parecendo requerer intervenções de reabilitação psicossocial ao invés da hospitalização.62963

On the notion of causality in medicine: addressing Austin Bradford Hill and John L. Mackie

Almost 50 years ago appeared the seminal article by Austin Bradford Hill where he presented parameters for inferring causes from statistical associations, which became known as Hill’s causal criteria. This was a milestone for the renewal of the idea of cause in medicine. Our article revisits his contribution in light of the ideas from the Australian philosopher John L. Mackie, whose important works on causality reached an audience distinct from Hill’s. We suggest that both the British epidemiologist and the Australian philosopher share the purpose of articulating probabilistic determinism and multi-causality, the first with a predominantly probabilistic model and the second with an analytical approach. This article explores the possible consequences of addressing these authors jointly in regard to causal inferences in medicine, especially in respect to mental disorders.Há quase 50 anos era publicado o artigo seminal de Austin Bradford Hill, no qual ele apresenta parâmetros para inferência de causas com base em associações estatísticas, que ficaram conhecidas como critérios causais de Hill. Aquele foi um marco para a renovação da ideia de causa na medicina. Nosso trabalho revisita suas ideias, articulando-as com o trabalho do filósofo australiano John L. Mackie, também autor de importante obra sobre causalidade, mas que teve uma audiência distinta da que Hill alcançou. Sugerimos que tanto o epidemiologista britânico quanto o filósofo australiano têm em comum o fato de que ambos procuram articular determinismo probabilístico e multicausalidade, o primeiro com um modelo predominantemente probabilista e o segundo com uma abordagem analítica. Este artigo explora as possíveis consequências da aproximação desses dois autores no que diz respeito a inferências causais na medicina, com foco particular nos transtornos mentais

Hazardous use of alcohol among undergraduate students at a public university

Background The potentially harmful consequences of alcohol use among undergraduates have become a growing concern in recent years. Objectives This study aimed to determine the prevalence of hazardous use of alcohol in this population and to identify demographic and psychosocial factors associated with this pattern of consumption. Methods This was a cross-sectional study using an anonymous and self-completed questionnaire in the classroom. The questionnaire was administered to 1,290 enrolled male and female students, which comprised a proportional sample of the main areas of knowledge at University of Campinas. The questionnaire produced sociodemographic and psychosocial profiles and the Alcohol Use Disorders Identification Test was used to detect hazardous use of alcohol. Results The prevalence of hazardous use of alcohol among the study participants was 24%. Male gender, subjective perceived social support in case of difficulties, being sexually active, not dating, having smoked tobacco cigarettes or marijuana, and having used other illicit psychoactive substances were associated with hazardous use of alcohol. Discussion Variables related to gender, sexuality, affective partnerships, and consumption of other psychoactive substances were associated with hazardous use of alcohol, which was identified in a quarter of the evaluated students, and indicate the need for strategies to prevent and to treat problems

Uso de drogas psicotrópicas por estudantes: prevalência e fatores sociais associados

OBJECTIVE: To determine the prevalence of the heavy use of drugs among elementary and high school students in a sample of public and private schools, and to identify associated demographic, psychological, cultural and social factors. METHODS: This report describes a cross-sectional study using an intention-type sampling technique that compared public schools in central and peripheral areas and private schools. An anonymous self-administered questionnaire was applied. The sample consisted of 2,287 elementary and high school students in the city of Campinas in 1998. Heavy use of drugs was defined as the use of drugs on 20 or more days during the 30 days preceding the survey (WHO, 1981). For the statistical analysis, polytomic logistic regression analysis (logit model) was utilized to identify factors that influenced this manner of using drugs. RESULTS: Heavy use of legal and illegal drugs was found as follows: alcohol (11.9%), tobacco (11.7%), marijuana (4.4%), solvents (1.8%), cocaine (1.4%), medications (1.1%) and ecstasy (0.7%). The heavy use of drugs was greatest among students at the city-center public school who had daytime jobs and studied in the evenings. These students were in the A and B socioeconomic classes and had had little religious education during childhood. CONCLUSIONS: Greater availability of cash and specific socialization patterns were identified as factors associated with the heavy use of drugs among students.OBJETIVO: Determinar a prevalência do uso pesado de drogas por estudantes de primeiro e segundo graus em uma amostra de escolas públicas e particulares, e identificar fatores demográficos, psicológicos e socioculturais associados. MÉTODOS: Trata-se de um estudo transversal com uma técnica de amostragem do tipo intencional comparando-se escolas públicas de áreas periféricas e centrais e escolas particulares. Foi utilizado um questionário anônimo de autopreenchimento. A amostra foi constituída por 2.287 estudantes de primeiro e segundo graus da cidade de Campinas, SP, no ano de 1998. Considerou-se uso pesado, o uso de drogas em 20 dias ou mais nos 30 dias que antecederam a pesquisa. Para análise estatística, utilizou-se a análise de regressão logística politômica - modelo logito, visando identificar fatores que influenciem este modo de usar drogas. RESULTADOS: O uso pesado de drogas lícitas e ilícitas foi de: álcool (11,9%), tabaco (11,7%), maconha (4,4%), solventes (1,8%), cocaína (1,4%), medicamentos (1,1%), ecstasy (0,7%). O uso pesado foi maior entre os estudantes da escola pública central, do período noturno, que trabalhavam, pertencentes aos níveis socioeconômicos A e B, e cuja educação religiosa na infância foi pouco intensa. CONCLUSÕES: Maior disponibilidade de dinheiro e padrões específicos de socialização foram identificados como fatores associados ao uso pesado de drogas em estudantes

[religion And Drug Use By Adolescents].

Many international studies show that religion is an important dimension modulating the use of alcohol and drugs by adolescents. to determine which religious variables are associated to frequent or heavy use of alcohol, tobacco and drugs among adolescents in intermediate and high schools in Campinas, Brazil. A cross-sectional study using a self-report anonymous questionnaire was administered to 2,287 students from a convenience sample of seven schools: five from central areas (two public and three private schools) and two public schools from the outskirts of the city, in 1998. The study analyzes data regarding the use of alcohol, tobacco, medicines, solvents, marijuana, cocaine and ecstasy. The religious variables included in the regression analysis were: religious affiliation, church attendance, self-assessed religiousness, and religious education in childhood. For the substances, nicotine, alcohol, marijuana, cocaine, ecstasy and abuse of medicines a logistic regression analysis for dicotomic answer was applied. The heavy use of at least one drug during the last month was more frequent among students that did not have a religious education during childhood. The use in the last month of cocaine, ecstasy and (abuse of) medicines was more frequent among those students that had no religion (cocaine and medicines) and that did not have a religious education during childhood (ecstasy and medicines). this study is consistent with previous investigations demonstrating a strong influence of religious variables over the use of drugs among adolescents. Interesting, it was found that no or weaker religious education during childhood was markedly associated with significant more use of drugs during adolescence.2682-9

Differences in Cortical Structure and Functional MRI Connectivity in High Functioning Autism

Autism spectrum disorders (ASD) represent a complex group of neurodevelopmental conditions characterized by deficits in communication and social behaviors. We examined the functional connectivity (FC) of the default mode network (DMN) and its relation to multimodal morphometry to investigate superregional, system-level alterations in a group of 22 adolescents and young adults with high-functioning autism compared to age-, and intelligence quotient-matched 29 healthy controls. The main findings were that ASD patients had gray matter (GM) reduction, decreased cortical thickness and larger cortical surface areas in several brain regions, including the cingulate, temporal lobes, and amygdala, as well as increased gyrification in regions associated with encoding visual memories and areas of the sensorimotor component of the DMN, more pronounced in the left hemisphere. Moreover, patients with ASD had decreased connectivity between the posterior cingulate cortex, and areas of the executive control component of the DMN and increased FC between the anteromedial prefrontal cortex and areas of the sensorimotor component of the DMN. Reduced cortical thickness in the right inferior frontal lobe correlated with higher social impairment according to the scores of the Autism Diagnostic Interview-Revised (ADI-R). Reduced cortical thickness in left frontal regions, as well as an increased cortical thickness in the right temporal pole and posterior cingulate, were associated with worse scores on the communication domain of the ADI-R. We found no association between scores on the restrictive and repetitive behaviors domain of ADI-R with structural measures or FC. The combination of these structural and connectivity abnormalities may help to explain some of the core behaviors in high-functioning ASD and need to be investigated further