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- 저자 : A.S. Viana (검색결과 3 건)
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Co and (Co,Mo) doping effects on the properties of highly reduced TiO2 anatase thin films
A.J. Silvestr,S. Rout,S. Dalui,L.C.J. Pereira,A.S. Viana,O. Conde 한국물리학회 2017 Current Applied Physics Vol.17 No.2
This work reports on the structural, optical, electrical and magnetic properties of Co:TiO2 and (Co,Mo):TiO2 anatase thin films grown onto (0001) sapphire substrates by Pulsed Laser Deposition in highly reducing conditions and at a low temperature of 350 C. Undoped TiO2d as well as doped films with nominal compositions of Ti0.95Co0.05O2d, Ti0.94Co0.05Mo0.01O2d, and Ti0.92Co0.05Mo0.03O2d were studied. They all show similar microstructures, with smooth surfaces and RMS roughness values less than 0.5 nm. The optical band gap energies of the doped films are red shifted with respect to that deduced for the undoped TiO2d. The correlation between the band gaps and the Urbach energies of the films is discussed. All samples show semiconductor behavior with n-type conduction. The Co:TiO2 sample is ferromagnetic with a saturation magnetization of 1.3 mB/Co, a high electrical conductivity of 123 S cm1 and a carrier density of 1.88 1021 cm3 at room temperature. The ferromagnetic order of the Co:TiO2 system is suppressed when carriers are added by codoping with Mo.
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Muscle-specific color stability in fresh beef from grain-finished Bos indicus cattle
Ana Paula A. A. Salim,Surendranath P. Suman,Anna C.V.C.S. Canto,Bruno R.C. Costa-Lima,Fernanda M. Viana,Maria Lucia G. Monteiro,Teofilo J. P. Silva,Carlos A. Conte-Junior 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.7
Objective: To investigate the color and oxidative stabilities of longissimus lumborum (LL) and psoas major (PM) muscles from grain-finished Bos indicus cattle in Brazil. Methods: The LL and PM muscles were obtained 24 h post-mortem from eight (n = 8) Nellore bull carcasses, fabricated into 1.5-cm steaks, aerobically packaged, and stored at 4°C for nine days. Steaks were analyzed for myoglobin concentration, pH, instrumental color, metmyoglobin reducing activity (MRA) and lipid oxidation. Results: The LL steaks exhibited greater (p<0.05) redness, color stability, and MRA than their PM counterparts on days 5 and 9. The LL and PM steaks demonstrated similar (p>0.05) lightness and yellowness on days 0, 5, and 9. On the other hand, PM steaks exhibited greater (p<0.05) myoglobin concentration, pH, and lipid oxidation than their LL counterparts. Conclusion: These results indicated that muscle source influenced the color and oxidative stabilities of beef from grain-finished Bos indicus animals. These results highlighted the necessity of muscle-specific strategies to improve the color stability of beef from grain-fed Bos indicus cattle.
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Draulio C. Silva,Ana L.P. Freitas,Carla D.S. Pessoa,Regina C.M. Paula,Jacilane X. Mesquita,Luzia K.A.M. Leal,Gerly A.C. Brito,Danilo O. Gonc¸alves,Glauce S.B. Viana 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.10
Flour made from Passiflora edulis fruit peel has been used in Brazil to treat diabetes. This study evaluated the effects of pectin from P. edulis on rats with alloxan-induced diabetes, on myeloperoxidase release from human neutrophils, and on carrageenan-induced paw edema. In the experiments on carrageenan-induced paw edema, paws were dissected for hematoxylin–eosin staining and immunohistochemistry determinations of tumor necrosis factor-α and inducible nitric oxide synthase. Male Wistar rats were divided into the following groups: diabetic controls and diabetic treated with pectin daily for 5 days (0.5–25 mg/kg orally). Glibenclamide and metformin were used as reference drugs. Forty-eight hours after alloxan administration, blood measures were determined (before treatment) and again 5 days later (after treatment). Pectin decreased blood glucose and triglyceride levels in diabetic rats. Pectin also decreased edema volume and release of myeloperoxidase (0.1–100 μg/mL). It also significantly decreased neutrophil infiltration and partially decreased immunostaining for tumor necrosis factor-α and inducible nitric oxide synthase. In conclusion, these data indicated that pectin, a bioactive compound present in P. edulis, has potential as a useful alternative treatment for type 2 diabetes. Its anti-inflammatory properties are probably involved in its antidiabetic action.
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