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Electronic transport properties of graphene/Al2O3 (0001) interface
M.S. Gusmao,Angsula Ghosh,H.O. Frota 한국물리학회 2018 Current Applied Physics Vol.18 No.1
The electronic structure and transport properties of a single layer of graphene (Gr) on a-Al2O3 surface are studied using the density functional theory (DFT). We present three models that take into account the atom at the termination of the alumina surface: a) Al atoms, with the center of the Gr hexagon directly over an Al atom; b) Al atoms, with a carbon directly positioned above an Al atom; c) oxygen atoms. Two processes of geometric optimization were used: (i) All the atoms of the supercell were allowed to move in accordance with the BFGS quasi-Newton algorithm; (ii) The atoms of the three topmost layers of the a-Al2O3 (0001) slab, including the C atoms, were allowed to move, whereas the atoms of the remaining layers were frozen in their respective atomic bulk positions. The first two models preserve qualitatively the electronic structure of the pristine Gr using the geometric optimization process (i) whereas, in the third model this structure was lost due to a significant charge transfer between the carbon and oxygen atoms irrespective of the optimization procedure. However, models (a) and (b) with the optimization (ii) reveal a p-type semiconducting behavior.
Identification of Trichophyton tonsurans by Random Ampli6ed Polymorphic DNA
Kim, Jeong Aee,Gusmao, Norma Buarque de,Okada, Kaoru,Takaki, Galba Maria de Campos,Fukushima, Kazutaka,Nishimura, Kazuko,Miyaji, Makoto 대한피부과학회 1999 Annals of Dermatology Vol.11 No.3
Background : T. tonsurans is an anthropophilic dermatophyte mostly causing tinea capitis and tinea corporis. In East Asian countries, it has rarely been isolated until now. However, it is necessary for researchers in Asian countries to be more accustomed to T. tonsurans than before because of frequent international sports exchanges nowadays. Objectives : This study was performed to identify T. tonsurans by random amplified polymorphic DNA (RAPD) analysis. Methods : Fifteen strains which were tentatively identified as T. tonsurans in Brazil were identified again by several conventional mycological tests and RAPD analysis. Results : Among 15 Brazilian strains, 3 were identified as T. tonsurans, 8 T. mentagrophytes, 3 T. rubrum and 1 T. raubitschekii by conventional mycological tests. This result was examined again by RAPD analysis. Conclusion : RAPD analysis is considered a rapid and reliable method for identification of T. tonsurans if the procedure is carefully standardized with adequate primers.
Chagas, Mariana Murai,Kobayashi-Velasco, Solange,Gimenez, Thais,Cavalcanti, Marcelo Gusmao Paraiso Korean Academy of Oral and Maxillofacial Radiology 2021 Imaging Science in Dentistry Vol.51 No.-
Purpose: This systematic review and meta-analysis assessed the diagnostic accuracy of imaging examinations for the detection of peri-implant bone defects and compared the diagnostic accuracy between titanium (Ti) and zirconium dioxide (ZrO<sub>2</sub>) implants. Materials and Methods: Six online databases were searched, and studies were selected based on eligibility criteria. The studies included in the systematic review underwent bias and applicability assessment using the Quality Assessment of Diagnostic Accuracy Studies 2 (QUADAS-2) tool and a random-effect meta-analysis. Summary receiver operating characteristic (sROC) curves were constructed to compare the effect of methodological differences in relation to the variables of each group. Results: The search strategy yielded 719 articles. Titles and abstracts were read and 61 studies were selected for full-text reading. Among them, 24 studies were included in this systematic review. Most included studies had a low risk of bias (QUADAS-2). Cone-beam computed tomography (CBCT) presented sufficient data for quantitative analysis in ZrO<sub>2</sub> and Ti implants. The meta-analysis revealed high levels of inconsistency in the latter group. Regarding sROC curves, the area under the curve (AUC) was larger for the overall Ti group (AUC=0.79) than for the overall ZrO<sub>2</sub> group (AUC=0.69), but without a statistically significant difference between them. In Ti implants, the AUCs for dehiscence defects(0.73) and fenestration defects(0.87) showed a statistically significant difference. Conclusion: The diagnostic accuracy of CBCT imaging in the assessment of peri-implant bone defects was similar between Ti and ZrO<sub>2</sub> implants, and fenestration was more accurately diagnosed than dehiscence in Ti implants.
Cortes, Arthur Rodriguez Gonzalez,No-Cortes, Juliana,Cavalcanti, Marcelo Gusmao Paraiso,Arita, Emiko Saito Korean Academy of Oral and Maxillofacial Radiology 2014 Imaging Science in Dentistry Vol.44 No.2
One of the most common oral surgical procedures is the extraction of the lower third molar (LTM). Postoperative complications such as paresthesia due to inferior alveolar nerve (IAN) injury are commonly observed in cases of horizontal and vertical impaction. The present report discusses a case of a vertically impacted LTM associated with a dentigerous cyst. An intimate contact between the LTM roots and the mandibular canal was observed on a panoramic radiograph and confirmed with cone-beam computed tomographic (CBCT) cross-sectional cuts. An orthodontic miniscrew was then used to extrude the LTM prior to its surgical removal in order to avoid the risk of inferior alveolar nerve injury. CBCT imaging follow-up confirmed the success of the LTM orthodontic extrusion.
Salineiro, Fernanda Cristina Sales,Gialain, Ivan Onone,Kobayashi-Velasco, Solange,Pannuti, Claudio Mendes,Cavalcanti, Marcelo Gusmao Paraiso Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.1
Purpose: The purpose of this study was to assess the accuracy, sensitivity, and specificity of the diagnosis of incipient furcation involvement with periapical radiography (PR) and 2 cone-beam computed tomography (CBCT) imaging protocols, and to test metal artifact interference. Materials and Methods: Mandibular second molars in 10 macerated pig mandibles were divided into those that showed no furcation involvement and those with lesions in the furcation area. Exams using PR and 2 different CBCT imaging protocols were performed with and without a metallic post. Each image was analyzed twice by 2 observers who rated the absence or presence of furcation involvement according to a 5-point scale. Receiver operating characteristic (ROC) curves were used to evaluate the accuracy, sensitivity, and specificity of the observations. Results: The accuracy of the CBCT imaging protocols ranged from 67.5% to 82.5% in the images obtained with a metallic post and from 72.5% to 80% in those without a metallic post. The accuracy of PR ranged from 37.5% to 55% in the images with a metallic post and from 42.5% to 62.5% in those without a metallic post. The area under the ROC curve values for the CBCT imaging protocols ranged from 0.813 to 0.802, and for PR ranged from 0.503 to 0.448. Conclusion: Both CBCT imaging protocols showed higher accuracy, sensitivity, and specificity than PR in the detection of incipient furcation involvement. Based on these results, CBCT may be considered a reliable tool for detecting incipient furcation involvement following a clinical periodontal exam, even in the presence of a metallic post.