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| 1 | Automatic Detection of COVID-19 Infection Using Chest X-Ray Images Through Transfer Learning显示文摘The new coronavirus(COVID-19),declared by the World Health Organization as a pandemic,has infected more than 1 million people and killed more than 50 thousand.An infection caused by COVID-19 can develop into pneumonia,which can be detected by a chest X-ray exam and should be treated appropriately.In this work,we propose an automatic detection method for COVID-19 infection based on chest X-ray images.The datasets constructed for this study are composed of194 X-ray images of patients diagnosed with coronavirus and 194 X-ray images of healthy patients.Since few images of patients with COVID-19 are publicly available,we apply the concept of transfer learning for this task.We use different architectures of convolutional neural networks(CNNs)trained on Image Net,and adapt them to behave as feature extractors for the X-ray images.Then,the CNNs are combined with consolidated machine learning methods,such as k-Nearest Neighbor,Bayes,Random Forest,multilayer perceptron(MLP),and support vector machine(SVM).The results show that,for one of the datasets,the extractor-classifier pair with the best performance is the Mobile Net architecture with the SVM classifier using a linear kernel,which achieves an accuracy and an F1-score of 98.5%.For the other dataset,the best pair is Dense Net201 with MLP,achieving an accuracy and an F1-score of 95.6%.Thus,the proposed approach demonstrates efficiency in detecting COVID-19 in X-ray images. | Elene Firmeza Ohata Gabriel Maia Bezerra João Victor Souza das Chagas Aloísio Vieira Lira Neto Adriano Bessa Albuquerque Victor Hugo Cde Albuquerque Pedro Pedrosa Rebouças Filho | 2021 | IEEE/CAA Journal of Automatica Sinica2021，8，1： | 3 |
| 2 | RANK, RANKL and osteoprotegerin in arthritic bone loss 显示文摘 | Bezerra MC Carvalho JF Prokopowitsch AS | 2005 | Braz J Med Biol Res2005，38，2： | 1 |
| 3 | Determination of splenomegaly by CT:is there a place for a single measurement?显示文摘 | D'Ippolito G Faintuch S | 2005 | Am J Roentgenol2005，184，5： | 1 |
| 4 | Determination of splenomegaly by CT:is there a place for a single measurement显示文摘 | Bezerra AS D'Ippolito G Faintuch S | 2005 | AJR Am J Roentgenol2005，184，： | 1 |
| 5 | Bioactive extracts of red seaweeds Pterocladiella capillacea and Osmundaria obtusiloba(Floridophyceae:Rhodophyta) with antioxidant and bacterial agglutination potential显示文摘Objective:To evaluate the antioxidant,antibacterial and bacterial cell agglutination activities of the hexane(Hex) and 70%ethanol(70%EtOH) extracts of two species of red seaweeds Pterocladiella capillacea(P.capillacea) and Osmundaria obtusiloba.Methods:In vitro antioxidant activity was determined by DPPH radical scavenging assay,ferric-reducing antioxidant power assay,ferrous ion chelating assay,β-carotene bleaching assay and total phenolic content quantification.Antimicrobial activity was tested using the method of disc diffusion on Mueller-Hinton medium.The ability of algal extracts to agglutinate bacterial cells was also tested.Results:The 70%EtOH extract of the two algae showed the highest values of total phenolic content compared to the Hex extract.The results of DPPH for both extracts(Hex,70%EtOH) of Osmundaria obtusiloba(43.46%and 99.47%) were higher than those of P.capillacea(33.04%and 40.81%) at a concentration of 1 000 μg/mL.As for the ferrous ion chelating,there was an opposite behavior,extracts of P.capillacea had a higher activity.The extracts showed a low ferric-reducing antioxidant power,with optical density ranging from0.054 to 0.180.Antioxidant activities of all extracts evaluated for β-carotene bleaching were above 40%.There was no antibacterial activity against bacterial strains tested.However,the extracts of both species were able to agglutinate bacterial Gram positive cells of Staphylococcus aureus and Gram negative cells of Escherichia coli,multidrug-resistant Salmonella and Vibrio harveyi.Conclusions This is the first report of the interaction between these algal extracts,rich in natural compounds with antioxidant potential,and Gram positive and Gram negative bacterial cells. | Daniel Barroso de Alencar Fátima Cristiane Teles de Carvalho Rosa Helena Rebouas Daniel Rodrigues dos Santos Kelma Maria dos Santos Pires-Cavalcante Rebeca Larangeira de Lima Bárbara Mendes Baracho Rayssa Mendes Bezerra Francisco Arnaldo Viana Regine Helena Silva dos Fernandes Vieira Alexandre Holanda Sampaio Oscarina Viana de Sousa Silvana Saker-Sampaio | 2016 | Asian Pacific Journal of Tropical Medicine2016，9，4： | 1 |
| 6 | RANK,RANKL and osteoprotegerin in arthritic bone loss 显示文摘 | Bezerra MC Carvalho JF Prokopowitsch AS | 2005 | Braz JMed Biol Res2005，38，： | 1 |
| 7 | RANK, RANKL and osteoprotegerin in arthritic bone loss显示文摘 | Bezerra MC Carvalho JF Prokopowitsch AS | 2005 | Braz J Med Biol Res2005，38，2： | 1 |
| 8 | Hydrogen sulfide prevents ethanol-induced gastric damage in mice:role of ATP-sensitive potassium channels and capsaicin-sensitive primary afferent neurons显示文摘 | Medeiros JV Bezerra VH Gomes AS | 2009 | J Pharmacol Exp Ther2009，330，3： | 1 |
| 9 | RANK,RANKL and osteoprotegerin in arthritic boneloss显示文摘 | Bezerra MC Carvalho JF Prokopowitsch AS | 2005 | Braz J Med Biol Res2005，38，2： | 1 |
| 10 | RANK, RANKL and osteoprotegerin in arthritic bone loss显示文摘 | Bezerra MC Carvalho JF Prokopowitsch AS | 2005 | Bra Med Bio Res2005，38，2： | 1 |
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