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- 저자 : Pedro C. Oliveira (검색결과 2 건)
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Rafaela C Santos,Larissa S Araujo,Rafael B Junqueira,Eliana D Costa,Fernanda M Pigatti,Kivanc Kamburoglu,Pedro HB Carvalho,Manuela LB Oliveira,Sibele N Aquino,Francielle S Verner Korean Academy of Oral and Maxillofacial Radiology 2023 Imaging Science in Dentistry Vol.53 No.-
Purpose: In the context of COVID-19, studies evaluating the adherence of dentists and dental students to infection control are relevant due to their high occupational exposure and risk, as well as their responsibility for disseminating information and good practices. This study evaluated the adherence of dentists and dental students to infection control in the oral radiology field in the setting of the COVID-19 pandemic on different continents. Materials and Methods: This cross-sectional observational study involved individuals who performed intraoral radiographic examinations during the COVID-19 pandemic. The Questionnaire on Infection Control in Oral Radiology was administered virtually using a Google Form. Participants from different continents(the Americas, Africa, Europe, Asia, and Oceania) were recruited. Data were subjected to descriptive analysis and simple and multiple binary regression (5%). Results: There were 582 valid answers, and 68.73% of the participants were from the Americas, 18.90% from Europe, and 12.37% from Asia. The median score for infection control protocols was 94 points for dental students and 104 points for dentists, and participants below the median were considered to have low adherence to infection control in oral radiology. Low access to infection control was found for 53.0% of dentists in the Americas, 34.0% from Europe, and 26.9% from Asia. Conclusion: The adherence to infection control protocols in oral radiology was low even in the face of the COVID-19 pandemic. The results may help improve the awareness of students and professionals, since oral radiology routines have the potential for transmitting COVID-19.
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Lucas S. Martin,Annie Ceron,Pedro C. Oliveira,Gisella M. Zanin,Heizir F. de Castro 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Silica hybrid materials, functionalized via incorporation of three organic components: β-cyclodextrin (βCD), carboxymethyl-cellulose (CMC) and hydroxyethyl-cellulose (HEC) were synthesized by the sol–gel technique and results were compared to a well-defined matrix (silica–polyvinyl alcohol–SiO2–PVA) with respect to immobilizing Burkholderia cepacia lipase. The main objective was set to select organic components that can replace the PVA to obtain a hybrid composite with greater hydrophobic character, without compromising the remarkable features of SiO2–PVA. All the three selected compounds allowed obtaining matrices that presented similar textural and morphological properties and gave high activity (1451–1661 U g−1) and thermal stability (t1/2 > 70 h) upon immobilization. Regarding glycerol affinity, all matrices had lower ability than SiO2–PVA to adsorb glycerol, with the SiO2–βCD matrix showing the lowest affinity due to the cyclic structure of the βCD. Transesterification reactions of palm kernel oil with ethanol mediated by B. cepacia immobilized on SiO2–βCD performed in a packed bed reactor under continuous flow confirmed the efficiency of the SiO2–βCD matrix in increasing the operational stability of system, revealing a half-life (t1/2 = 1040 h), 2.5 times greater than that achieved in the same system using lipase immobilized on SiO2–PVA (t1/2 = 430 h).
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