New Learning and the Classification of Learning Environments in Secondary Education

Contains fulltext : 64692.pdf (publisher's version ) (Closed access)This article presents a new classification scheme for learning environments in secondary education, based on a review of recent literature on new learning and a review of existing classification schemes. This new classification scheme emphasizes new forms of learning and is organized around three main aspects of learning environments that may be assumed to influence such learning: (a) learning goals, (b) the division of teacher and learner roles, and (c) the roles of the learners in relation to each other. It is then argued that teachers might use this classification scheme to design and evaluate their own learning environments. In addition, the scheme provides a clear framework for a next generation of process–product research

Escala de atitudes frente ao HIV/AIDS: análise de fatores HIV/AIDS attitudes scale: factorial analysis

OBJETIVO: Este trabalho apresenta resultados acerca das propriedades psicométricas da "Escala de atitudes frente ao HIV/AIDS". Os dados, provenientes de uma amostra de 549 alunos entre universitários, ensinos médio e ensino fundamental. MÉTODOS: Os dados foram tratados pelo método dos componentes principais da análise fatorial. A análise final, postulado um eigenvalue mínimo de 2, resultou cinco fatores. Foram eliminados itens que apresentaram carga fatorial menor que 0,30. Neste estudo, o menor alfa observado foi de 0,79. Portanto, é provável que todos os 47 itens do instrumento final elaborado meçam o mesmo construto: atitude frente ao HIV/AIDS. RESULTADOS: Escores inferiores a 96 foram considerados "fraco grau de conhecimento sobre HIV/AIDS"; entre 96 e 192 "moderado grau de conhecimento" e acima de 192 "alto grau de conhecimento sobre HIV/AIDS". Foram estabelecidos os fatores: 1, 2 e 3, sendo "fator geral de percepção da informação técnico-científica"; "fator de percepção da informação técnico-científica versus sexualidade e preconceito"; "fator de percepção da informação técnico-científica no uso de drogas", respectivamente. CONCLUSÕES: O alfa de Cronbach encontrado para a escala como um todo foi de 0,859, sugerindo fortemente a existência da fidedignidade do instrumento que se mostrou útil para avaliar o grau de conhecimento acerca do HIV/AIDS e o risco decorrente do desconhecimento, entre estudantes.<br>OBJETIVE: This paper presents results related to the psychometric properties of the Escala de atitudes frente a HIV/AIDS (Attitudes Towards HIV/AIDS Scale). METHODS: The data was derived from a sample with 549 high and elementary school level students. The data was treated by Principal Components Analysis (PCA) and Factor Analysis (FA). The final analysis resulted in 5 factors, given a minimal eigenvalue 2. Factor load items lower than 0.30 were excluded. In this study, the lowest alpha observed was 0.79. Therefore, it is likely that all 47 final tool items measure the same construct: attitude towards HIV/AIDS. RESULTS: Scores < 96 were considered "low knowledge amount on HIV/AIDS"; scores between 96 and 192 meant "moderate knowledge amount on HIV/AIDS", and scores > 192 were considered "high knowledge amount on HIV/AIDS". Factors 1, 2, and 3, i.e. "Technical/Scientific Information Perception General Factor"; "Technical/Scientific Information Perception Factor versus Sexuality and Prejudice"; "Technical/Scientific Information Perception Factor in Drug Abuse", respectively, were created. CONCLUSIONS: Cronbach’s alpha found for the scale as a whole was 0.859 and strongly suggests reliability of the tool, as it showed useful to evaluate the knowledge amount regarding HIV/AIDS and the risk resulting from lack of knowledge among students

The resumption of consumption: a review on tuberculosis

Among all infectious diseases that afflict humans, tuberculosis (TB) remains the deadliest. At present, epidemiologists estimate that one-third of the world population is infected with tubercle bacilli, which is responsible for 8 to 10 million new cases of TB and 3 million deaths annually throughout the world. Approximately 95% of new cases and 98% of deaths occur in developing nations, generally due to the few resources available to ensure proper treatment and where human immunodeficiency virus (HIV) infections are common. In 1882, Dr Robert Koch identified an acid-fast bacterium, Mycobacterium tuberculosis, as the causative agent of TB. Thirty-nine years later, BCG vaccine was introduced for human use, and became the most widely used prophylactic strategy to fight TB in the world. The discovery of the properties of first-line antimycobacterial drugs in the past century yielded effective chemotherapies, which considerably decreased TB mortality rates worldwide. The later introduction of some additional drugs to the arsenal used to treat TB seemed to provide an adequate number of effective antimicrobial agents. The modern, standard short-course therapy for TB recommended by the World Health Organization is based on a four-drug regimen that must be strictly followed to prevent drug resistance acquisition, and relies on direct observation of patient compliance to ensure effective treatment. Mycobacteria show a high degree of intrinsic resistance to most antibiotics and chemotherapeutic agents due to the low permeability of its cell wall. Nevertheless, the cell wall barrier alone cannot produce significant levels of drug resistance. M. tuberculosis mutants resistant to any single drug are naturally present in any large bacterial population, irrespective of exposure to drugs. The frequency of mutants resistant to rifampicin and isoniazid, the two principal antimycobacterial drugs currently in use, is relatively high and, therefore, the large extra-cellular population of actively metabolizing and rapidly growing tubercle bacilli in cavitary lesions will contain organisms which are resistant to a single drug. Consequently, monotherapy or improperly administered two-drug therapies will select for drug-resistant mutants that may lead to drug resistance in the entire bacterial population. Thereby, despite the availability of effective chemotherapy and the moderately protective vaccine, new anti-TB agents are urgently needed to decrease the global incidence of TB. The resumption of TB, mainly caused by the emergence of multidrug-resistant (MDR) and extensively drug-resistant (XDR) strains and HIV epidemics, led to an increased need to understand the molecular mechanisms of drug action and drug resistance, which should provide significant insight into the development of newer compounds. The latter should be effective to combat both drug-susceptible and MDR/XDR-TB