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- 검색키워드
- 저자 : Frederico Nogueira (검색결과 4 건)
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Frederico Nogueira,Joana Vaz,Claudia Mouro,Erhan Piskin,Isabel Gouveia 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.3
In the past years the textile industry haswitnessed new advances in the area of textile fiber chainsengineering, which allow the modification of the structureof such chains so as to produce polymers responsive tochanges in the environment, thus capable of attaching tocells and bioactive molecules. On the other hand, followingour society's trend towards higher hygiene standards, theresearch and development of antimicrobial textiles hasshown a remarkable increase. Applications of such textilescan nowadays be found in underwear, sportswear, homefurnishing, protective clothing, wound-dressings and inmicrobial infection high risk settings, such as health careinstitutions. The present research aims at the developmentof a strong, durable and washable antimicrobial L-Cysteine(L-Cys)-functionalized cotton by means of a covalentmechanism. The covalent binding of L-Cys onto cellulosicfibers was assessed by Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) andFourier Transform Infrared Spectroscopy (FTIR) analysis. Antimicrobial assays showed that the functionalized cottonyielded strong microbial killing rates, exhibiting inhibitionratios of 89 and 83% against K. pneumoniae and S. aureus,respectively. These results demonstrate the effectiveness ofthe covalent modification of cotton fabrics with L-Cysadding antimicrobial properties to cotton fibers and thusopen the door to a world of applications in the area ofincreased risk microbial infections.
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Amino Acid-Based Material for the Complementary Therapy of Decubitus Ulcers
( Frederico Nogueira ),( Isabel C. Gouveia ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.4
Chronic wounds, pressure sores, lesions, and infections of microbial origin in bedridden, paralyzed, or malnutrition patients remain the object of study of many researchers. A variety of factors behind the development of these disorders are related to the patient`s immune system, making it unable to respond effectively to the treatment of the wound. These factors can be properly controlled, giving particular importance to the ethiology and stage of the wound, as well as the time periods corresponding to the replacement of the dressings. The present research reports a novel foam/soft material, L-Cys-g-PCL, with an application for decubitus/pressure ulcers, especially for wounds with a difficult healing process due to infections and constant oxidation of the soft tissues. During this work, the interactions between S. aureus and L-Cys-g-PCL foam were studied under conditions that simulate decubitus ulcers; namely, pH and exudate. The effects of duration of grafting (1 or 8 h) and pH (7.0 and 8.9) on wettability, surface energy, swelling, and porosity were also evaluated. Results showed an effective microbicidal activity exhibiting an inhibition ratio of 99.73% against S. aureus. This new L-Cys-g-PCL soft material showed saftey to contact skin, ability to be shaped to fill in sunken holes (craters) - pressure ulcers stage III - and to act as a smart material responsive to pH, which can be tailored to develop better swelling properties at alkaline pH where exudates are normally higher, so as to address exudate self-cleaning and prevention of desiccation.
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Emmanuel Joao Nogueira Leal Silva,Brenda Leite Muniz,Frederico Pires,Felipe Goncalves Belladonna,Aline Almeida Neves,Erick Miranda Souza,Gustavo De-Deus 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.1
Objectives: The purpose of this study was to assess the ability of ProTaper Gold (PTG, Dentsply Maillefer) in maintaining the original profile of root canal anatomy. For that, ProTaper Universal (PTU, Dentsply Maillefer) was used as reference techniques for comparison. Materials and Methods: Twenty simulated curved canals manufactured in clear resin blocks were randomly assigned to 2 groups (n = 10) according to the system used for canal instrumentation: PTU and PTG groups, upto F2 files (25/0.08). Color stereomicroscopic images from each block were taken exactly at the same position before and after instrumentation. All image processing and data analysis were performed with an open source program (FIJI). Evaluation of canal transportation was obtained for two independent canal regions: straight and curved levels. Student's t test was used with a cut-off for significance set at α = 5%. Results: Instrumentation systems significantly influenced canal transportation (p < 0.0001). A significant interaction between instrumentation system and root canal level (p < 0.0001) was found. PTU and PTG systems produced similar canal transportation at the straight part, while PTG system resulted in lower canal transportation than PTU system at the curved part. Canal transportation was higher at the curved canal portion (p < 0.0001). Conclusions: PTG system produced overall less canal transportation in the curved portion when compared to PTU system.
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Silva, Emmanuel Joao Nogueira Leal,Muniz, Brenda Leite,Pires, Frederico,Belladonna, Felipe Goncalves,Neves, Aline Almeida,Souza, Erick Miranda,De-Deus, Gustavo The Korean Academy of Conservative Dentistry 2016 Restorative Dentistry & Endodontics Vol.41 No.1
Objectives: The purpose of this study was to assess the ability of ProTaper Gold (PTG, Dentsply Maillefer) in maintaining the original profile of root canal anatomy. For that, ProTaper Universal (PTU, Dentsply Maillefer) was used as reference techniques for comparison. Materials and Methods: Twenty simulated curved canals manufactured in clear resin blocks were randomly assigned to 2 groups (n = 10) according to the system used for canal instrumentation: PTU and PTG groups, upto F2 files (25/0.08). Color stereomicroscopic images from each block were taken exactly at the same position before and after instrumentation. All image processing and data analysis were performed with an open source program (FIJI). Evaluation of canal transportation was obtained for two independent canal regions: straight and curved levels. Student's t test was used with a cut-off for significance set at ${\alpha}=5%$. Results: Instrumentation systems significantly influenced canal transportation (p < 0.0001). A significant interaction between instrumentation system and root canal level (p < 0.0001) was found. PTU and PTG systems produced similar canal transportation at the straight part, while PTG system resulted in lower canal transportation than PTU system at the curved part. Canal transportation was higher at the curved canal portion (p < 0.0001). Conclusions: PTG system produced overall less canal transportation in the curved portion when compared to PTU system.
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