Sistema local de pesquisa e desenvolvimento de empresas de base tecnológica em Juiz de Fora [Local research system and the devepolment of high technology firms in Juiz de Fora]

Brazil; Juiz de Fora; regional economic development; science parks; high technology firms

Interview with Luigi Abbate

In this article we interviewed the Italian composer Luigi Abbate. In our conversation we focused on music composition teaching, its developments and challenges. We started from the historical view of Professor Abbate, in order to carry out a brief comparative analysis of Italian and Brazilian music education. During the conversation, we passed through subjects such as the curriculum of composition courses, the use of the classical repertoire in class and the didactics of teaching music composition

Interview with Luigi Abbate

In this article we interviewed the Italian composer Luigi Abbate. In our conversation we focused on music composition teaching, its developments and challenges. We started from the historical view of Professor Abbate, in order to carry out a brief comparative analysis of Italian and Brazilian music education. During the conversation, we passed through subjects such as the curriculum of composition courses, the use of the classical repertoire in class and the didactics of teaching music composition

Pregled primjene eteričnih ulja i biljnih ekstrakata kao konzervansa i prirodnih antioksidansa u mesu i mesnim prerađevinama

The meat and meat product industry has evolved according to the needs of the market. Consumers are increasingly seeking quality in food. Thus, the concern regarding the excessive use of additives such as preservatives and antioxidants has driven research towards natural, healthy and safe substitutes. Essential oils and plant extracts have been shown to be a good option for resolving this problem. They are completely natural with biological activity, which mainly includes prevention of oxidation and the proliferation of microorganisms, thus arousing the interest of the industry and consumers. This review will present studies published in the last five years regarding the potential of essential oils and plant extracts to act as preservatives and antioxidants in meat and meat products. The forms of application, innovations in the area, alternatives to the incorporation of essential oils and extracts in meat products, effects caused in food, and limitations of applications will be detailed and discussed.Proizvodnja mesa i mesnih prerađevina se prilagođava potrebama tržišta. Potrošači sve više traže da hrana bude kvalitetna. Stoga je zabrinutost zbog pretjerane uporabe aditiva, kao što su konzervansi i antioksidansi, potaknula istraživanja o njihovim prirodnim, zdravim i sigurnim zamjenama. Eterična ulja i biljni ekstrakti pokazali su se kao dobro rješenje tog problema. Potpuno su prirodni, a njihova biološka aktivnost se uglavnom zasniva na sprečavanju oksidacijskog oštećenja i rasta mikroorganizama, zbog čega pobuđuju interes prehrambene industrije i potrošača. Ovaj rad donosi pregled istraživanja o mogućnostima primjene eteričnih ulja i biljnih ekstrakata kao konzervansa i antioksidansa u mesu i mesnim prerađevinama, objavljenih u posljednjih pet godina. Detaljno su opisani i raspravljeni načini primjene eteričnih ulja i biiljnih ekstrakata u mesnim proizvodima, inovacije u području, alternativna rješenja, učinci na hranu i ograničenja njihove primjene

Evaluation of three different rotary systems during endodontic retreatment: analysis by scanning electron microscopy

Background: Endodontic therapy is considered a series of important and interdependent steps, and failure of any of these steps may compromise the treatment outcome. This study aimed to evaluate the effectiveness of three different rotary systems in removing obturation materials during endodontic retreatment using scanning electron microscopy (SEM) analysis. Material and Methods: Thirty-six endodontically treated teeth were selected and divided into 3 groups of 10 and 1 control group with 6 dental elements. The groups were divided according to the rotary system used for removing gutta-percha, as follows: G1: ProTaper system; G2: K3 system; G3: Mtwo system; and G4: Control group. Thereafter, the roots were split and the sections were observed under SEM, for analysis and counting of clear dentinal tubules, creating the variable “degree of dentinal tubule patency” (0: intensely clear; 1: moderately clear; 2: slightly clear; 3: completely blocked). The data were subjected to the Friedman and Kruskal-Wallis statistical tests. Results: No differences were observed in the “degree of dentinal tubule patency” neither between the root thirds (to each evaluated group) nor between the groups (to each evaluated third). Nevertheless, when the three root thirds were grouped (providing evaluation of all root extension), the “degree of dentinal tubule patency” was lower in G1 than in G3 ( p <0.05), but showed no differences neither between G1 and G2 nor G2 and G3. Conclusions: No technique was able to completely remove the canal obturation material, despite G1 having shown better results, although without significant difference to G

Importance of rotary systems in dental care by undergraduate students in patients of a public health service of Belo Horizonte

Background: The aim of this study was to evaluate the fracture rates of ProTaper rotary files used in the endodontics extension clinic of the Undergraduate Dentistry Course of the Pontifical Catholic University of Minas Gerais during the prior eight years. Material and Methods: Control record data regarding file usage by students were collected and analyzed by semester. For each period, the total number of patient consultations, the frequency of file use, the occurrence of fractures and the file numbers for which fractures occurred were noted. Descriptive statistics, including frequency of file fractures were calculated for all file types. The chi-square test was used to evaluate differences in the frequency of file fractures between all file types. Results: The study results revealed that during the examined period, there were 1006 consultations and 7993 uses of files. A total of 30 file fractures were recorded throughout this period; thus, fractures occurred in 0.37% of total file uses and 2.98% of all consultations. The most frequently used files were S1, S2 and F1, and these files also accounted for the most fractures. However, no differences in the frequency of file fractures were observed between the file types ( p >0.05). Conclusions: The low fracture rates observed in this study indicate that the examined instruments can be used to safely provide dental care to patients

Root canal shaping of curved canals by Reciproc Blue system and Pro Taper Gold : a micro-computed tomographic study

This study aimed to evaluate the centralization and transportation of ProTaper Gold (PTG) rotary system and Reciproc Blue (RB) reciprocating system in curved canals, by using micro-CT. Twenty extracted mandibular molars were previously scanned by usin

Stromal myofibroblasts in oral leukoplakia and oral squamous cell carcinoma

Objectives: Oral leukoplakia (OL) is the main potentially malignant disorder and oral squamous cell carcinoma (OSCC) is the most common malignancy of the oral mucosa. Stromal myofibroblasts play an important role in tumor invasion and metastasis, due to its ability to modify the extracellular matrix. This study aimed to evaluate the presence of stromal myofibroblasts in OL and OSCC. Differences in the presence of myofibroblasts among OL with distinct grades of epithelial dysplasia as well as between histologically high- and low-invasive OSCC were also assessed. Study D esign: A total of 30 OL and 41 OSCC from archival formalin-fixed, paraffin-embedded specimens were evaluated. 10 samples of normal oral mucosa were used as a control. Myofibroblasts were identified by immunohistochemical detection of alpha smooth muscle actin and its presence was classified as negative, scanty or abundant. Differences in the presence of myofibroblasts among OL with distinct grades of epithelial dysplasia as well as between high- and low-invasive OSCC were analyzed using the Mann-Whitney test. Results: Myofibroblasts were not detected in normal oral mucosa and OL, whatever its histological grade. In OSCC, the presence of stromal myofibroblasts was classified as negative in 11 (26.8%), scanty in 15 (36.6%), and abundant in 15 samples (36.6%). The presence of stromal myofibroblasts was statistically higher in high-invasive OSCC than in low-invasive OSCC (p<0.05). Conclusions: Stromal myofibroblasts were not detected in OL, indicating that these cells are not important during oral carcinogenesis. Nevertheless, stromal myofibroblasts were heterogeneously detected in OSCC and its presence was higher in tumors with a more diffuse histological pattern of invasion. These findings suggest that myofibroblasts are associated with the creation of a permissive environment for tumor invasion in OSC

Advanced osteosarcoma of the maxilla : a case report

Osteosarcomas are primary malignant bone tumours in which mesenchymal cells produce osteoid. It is generally the most common malignant bone neoplasm, although lesions of the jaw are uncommon. Osteosarcoma of the jaw (JOS) presents a lower incidence of metastasis and a better prognosis than osteosarcoma of the long bones. However, patients with JOS can exhibit advanced tumours, mainly when early diagnosis is not performed. This article reports on a case of an advanced osteosarcoma of the maxilla. A 38-year-old woman was referred for evaluation and treatment of recurrent fibrous dysplasia of the facial bones. The patient related that she had been diagnosed with fibrous dysplasia four years earlier and, since the first diagnosis, she was submitted to four surgical interventions, all followed by recurrences. The main clinical findings were redness and swelling of the facial skin, upper lip ulceration, and hard palate swelling. Computed tomography showed a large hyperdense mass in right maxilla extending to right orbit and left maxillary sinus. An incisional biopsy was performed and microscopic examination showed areas of osteoid and chondroid formation surrounded by a cellular stroma. The diagnosis of osteosarcoma was established and the patient was recommended for oncologic treatment. Unfortunately, she died six months after the diagnosis due to uncontrollable local spread