Nos meandros das políticas públicas: a biblioteca escolar em (dis)curso

The aim of this article is to investigate how the school libraries are put in discourse within the brazilian public policies that (supposedly) have them as focus, highlighting the lack and misunderstanding that go trough the discourse and such initiatives. We also analyzed, from the perspective of french discourse analysis, the law nº. 12244/2010 (which aims at universalisation of libraries in all educational institutions in the country) in order to investigate how the discursive memory supports the return of some meanings which have already said about this institution, meanings constructed by power relations that allow them naturalization, besides researching if the discourses that circulate in this document point to a change in how the library has been stated so far, allowing the emergence of new dicursive positions, other meanings that bring the promise of new possibilities for the school libraries.O objetivo deste artigo é investigar como as bibliotecas escolares são discursivizadas no âmbito das políticas públicas brasileiras que (supostamente) as tem como foco, chamando a atenção para a falta e o equívoco que perpassam o discurso bem como tais iniciativas. Nós buscamos também analisar, a partir da perspectiva da Análise do Discurso de linha francesa, a lei nº 12244/2010 (que visa à universalização das bibliotecas em todas as instituições de ensino do país), de modo a investigar como a memória discursiva sustenta a retomada de alguns dos sentidos já-ditos sobre essa instituição, os quais foram constituídos por meio de relações de força que permitem a sua naturalização e, também, se os discursos que circulam nesse documento apontam para uma mudança na maneira como a biblioteca foi enunciada até então, possibilitando a emergência de novas posições discursivas, outros sentidos que carregam a promessa de novas possibilidades para as bibliotecas escolares

Fracture strength of flared bovine roots restored with different intraradicular posts

OBJECTIVE: The aim of this study was to evaluate the fracture strength and failure mode of flared bovine roots restored with different intraradicular posts. MATERIAL AND METHODS: Fifty bovine incisors with similar dimensions were selected and their roots were flared until 1.0 mm of dentin wall remained. Next, the roots were allocated into five groups (n=10): GI- cast metal post-and-core; GII- fiber posts plus accessory fiber posts; GIII- direct anatomic post; GIV- indirect anatomic post and GV- control (specimens without intraradicular post). A polyether impression material was used to simulate the periodontal ligament. After periodontal ligament simulation, the specimens were subjected to a compressive load at a crosshead speed of 0.5 mm/min in a servo-hydraulic testing machine (MTS 810) applied at 135º to the long axis of the tooth until failure. The data (N) were subjected to ANOVA and Tukey's post-hoc test (α=0.05). RESULTS: GI and GIV presented higher fracture strength (p;0.05) from GI, GII and GIV. Control specimens (GV) produced the lowest fracture strength mean values (

Genome Sequencing and Analysis of a Type A Clostridium perfringens Isolate from a Case of Bovine Clostridial Abomasitis

Clostridium perfringens is a common inhabitant of the avian and mammalian gastrointestinal tracts and can behave commensally or pathogenically. Some enteric diseases caused by type A C. perfringens, including bovine clostridial abomasitis, remain poorly understood. To investigate the potential basis of virulence in strains causing this disease, we sequenced the genome of a type A C. perfringens isolate (strain F262) from a case of bovine clostridial abomasitis. The ∼3.34 Mbp chromosome of C. perfringens F262 is predicted to contain 3163 protein-coding genes, 76 tRNA genes, and an integrated plasmid sequence, Cfrag (∼18 kb). In addition, sequences of two complete circular plasmids, pF262C (4.8 kb) and pF262D (9.1 kb), and two incomplete plasmid fragments, pF262A (48.5 kb) and pF262B (50.0 kb), were identified. Comparison of the chromosome sequence of C. perfringens F262 to complete C. perfringens chromosomes, plasmids and phages revealed 261 unique genes. No novel toxin genes related to previously described clostridial toxins were identified: 60% of the 261 unique genes were hypothetical proteins. There was a two base pair deletion in virS, a gene reported to encode the main sensor kinase involved in virulence gene activation. Despite this frameshift mutation, C. perfringens F262 expressed perfringolysin O, alpha-toxin and the beta2-toxin, suggesting that another regulation system might contribute to the pathogenicity of this strain. Two complete plasmids, pF262C (4.8 kb) and pF262D (9.1 kb), unique to this strain of C. perfringens were identified