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Giselle Franca da Costa,Dayane Teixeira Ognibene,Cristiane Aguiar da Costa,Michelle Teixeira Teixeira,Viviane da Silva Cristino Cord,Graziele Freitas de Bem,Anibal Sanchez Moura,Angela de Castro Resen 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.1
This study investigated the protective effect of a Vitis vinifera L. grape skin extract (ACH09) on blood pressure, lipid profile, and oxidative status in spontaneously hypertensive rats (SHR). Systolic blood pressure (SBP), total cholesterol, triglyceride, and glucose levels, as well as oxidative damage and antioxidant activity in the plasma and kidney, were evaluated in four experimental groups: control Wistar rats (W-C) and SHR-C that received water, and Wistar rats and SHR treated with ACH09 (200 mg/kg/d) in drinking water for 12 weeks (W-ACH09 and SHR-ACH09, respectively). SBP increased in the SHR group compared with the W groups and the treatment with ACH09 prevented the development of hypertension. Plasma triglyceride and total cholesterol levels increased in SHR compared with W-C rats; these changes prevented by treatment with ACH09. Glucose levels did not differ between the groups. The SHR group had increased oxidative damage in plasma, as expressed by 2-thiobarbituric acid reactive substances (TBARS) levels, and this prevented by ACH09. Levels of TBARS in the kidneys were lower in the SHR-ACH09 group than in the SHR-C group. Further, ACH09 increased the superoxide dismutase activity in both the plasma and kidneys of both SHR and Wistar rats. These results suggest that ACH09 is protective against disruption of blood pressures, oxidant status, and lipid profile in SHR, and provide important evidence on the benefits of ACH09 on hypertension and associated cardiovascular complications.
Teixeira da Silva, Jaime A.,Fukai, Seiichi The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.1
Successful genetic transformation of plants requires non-chimeric selection of transformed tissues and their subsequent regeneration. With rare exceptions, most transformation protocols still rely heavily on antibiotics for selecting transgenic cells that contain an antibiotic-degrading selectable marker gene. Here, the morphogenic capacity of in-vitro explants of chrysanthemnum and tobacco stems and leaves (control and transgenic) changed with the addition of aminoglycoside antibiotics (AAs), In a test of 6 AAs, phytotoxicity occurred at concentrations of 10 to 25 and 50 to 100$\mu\textrm{g}$ $mL^{-1}$ in chrysanthemum and tobacco explants, respectively. Light conditions as well as explant source and size also had significant effects. The use of transverse thin cell layers (tTCLs), in conjunction with high initial AA selection levels, supported the greatest regeneration of transgenic material (adventitious shoots or callus) and the lowest number of escapes. Flow-cytometric analyses revealed no endodu-plication in chrysanthemum, even at high AA levels. However, this phenomenon was observed in tobacco calli(8C or more), even at low AA concentrations (i.e., 5 to 10 $\mu\textrm{g}$ mL$^{-1}$ ).
Teixeira, P.F.,Ferreira, P.A.,Pita, A. Lopez,Casas, C.,Bachiller, A. The Korean Society for Railway 2009 International Journal of Railway Vol.2 No.1
The development of structural solutions for high-speed or very high-speed tracks that minimize total life cycle costs of the system is a key issue to improve the operational profitability of new investments. In opposition to conventional ballasted tracks, slab track solutions can be a cost-effective solution, but only in the cases where the benefits due to the increase in track availability and the reduction of track maintenance offsets its much higher construction costs. In the cases where such investment is not feasible, it is worth to evaluate possible structural improvements to ballasted track that allow reducing its maintenance needs without increasing too much its construction costs. This paper evaluates the design requirements and the impact of improving conventional high-speed ballasted tracks by using a bituminous subballast layer. It is divided into two main parts: first the design requirements of the structural solutions with bituminous subballast and its possible benefits on high-speed track deterioration, and secondly the evaluation of the economic impact, in terms of construction costs, of using this structural solution material in future Spanish high-speed lines.
( Sílvia Teixeira ) 부산외국어대학교 지중해지역원 2023 The Mediterranean Review Vol.16 No.1
This article focuses on the vital role of slaves and freedmen in the construction and preservation of Lusitania as a Roman province, with an emphasis on their contribution to establishing and maintaining the connection between Lusitania and the Mediterranean. Building upon the author's Ph.D. thesis, which specifically examines this topic, the study investigates the economic and trade networks enabled by Lusitania's maritime link. Through a comprehensive analysis of Latin epigraphy related to slaves and freedmen in the region, including their names, occupations, and sociocultural pursuits, this research provides insights into their significance in shaping Lusitania's development.
Paulo Teixeira Lacava,Welington Luiz Araujo,Joao Lucio Azevedo 한국미생물학회 2007 The journal of microbiology Vol.45 No.1
Over the last few years, the endophytic bacterial community associated with citrus has been studied as an important component interacting with Xylella fastidiosa, the causal agent of citrus variegated chlorosis(CVC). This bacterium may also colonize some model plants, such as Catharanthus roseus and Nicotiana clevelandii. In the present study, we compared the endophytic colonization of Citrus sinensis and Catharanthus roseus using the endophytic bacteria Klebsiella pneumoniae. We chose an appropriate strain, K. pneumoniae 342 (Kp342), labeled with the GFP gene. This strain was inoculated onto seedlings of C. sinensis and C. roseus. The isolation frequency was determined one week after the inoculation and the endophytic colonization of K. pneumoniae was observed using fluorescence microscopy. Although the endophytic bacterium was more frequently isolated from C. roseus than from C. sinensis, the colonization profiles for both host plants were similar, suggesting that C. roseus could be used as a model plant to study the interaction between endophytic bacteria and X. fastidiosa.
Analysis of the bacterial community in glassy-winged sharpshooter heads
Paulo Teixeira LACAVA,Jennifer PARKER,Fernando Dini ANDREOTE,Francisco DINI-ANDREOTE,José Luiz. RAMIREZ,Thomas A. MILLER 한국곤충학회 2007 Entomological Research Vol.37 No.4
The glassy-winged sharpshooter (GWSS), Homalodisca vitripennis, is an important vector of various strains of Xylella fastidiosa, which cause disease in a variety of economically important plants. These diseases include citrus variegated chlorosis, oleander leaf scorch and Pierce’'s Disease of grapevines. Symbiotic control (SC) is a new strategy that uses symbiotic endophytes as biological control agents to antagonize or displace the pathogenic strains of X. fastidiosa. Candidate endophytes for use in SC must occupy the xylem of host plants and attach to the pre-cibarium and cibarium of sharpshooter insects in order to have access to the pathogen. The study of the bacterial community of GWSS heads by isolation and denaturing gradient gel electrophoresis (DGGE) revealed the presence of species that may be suitable for use in SC. In addition, the results indicated that two important factors, insect age and choice of host plant, affect the composition of the bacterial community in GWSS heads. The main bacterial genera isolated as colonizers of GWSS heads were identified, using partial 16S rRNA gene sequencing, as Bacillus, Pseudomonas, Pedobacter and Methylobacterium, as well as the species Curtobacterium flaccumfaciens. DGGE patterns revealed a diversity of endophytic species able to colonize the GWSS head. The main genera isolated in culture were also identified using this technique. Principal component analysis (PCA) from polymerase chain reaction (PCR)-DGGE patterns indicated that the bacteria inhabiting the GWSS head are similar to those found as endophytes inside the host plants, and that insect developmental stage and preferential feeding on one host plant species over another are important factors in determining the composition of the bacterial community in the GWSS head. However, a shift in host plants for a small period of time did not cause changes in the compositions of these communities.
L.Teixeira,Y. Zhang,Y. Kang 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The integration of wind power into electrical grid has some limitations and constraints. The network operators have used the simulation method to preview these issues before to connect the wind farm into network power system. This paper evaluated the stability analysis of overall power system of Santiago Island, Cape Verde, considering 9.25 ㎿-wind farm under gust condition. The results by simulation in the MATLAB/Simulink® environment showed a stable performance of overall power system even considering a high penetration level of wind power under gust condition.
Particle deposition in random fibrous porous materials
Richardson Teixeira,Antonio F. Miguel 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.11
Porous filters are widely used to control air pollution and have different industrial applications since they constitute a reliable and low cost solution to separate particulate matter from an air stream. In this study, the particle deposition within 3D porous filters subjected to low-frequency acoustic fields is studied following a numerical approach. Findings demonstrate that the application of acoustic waves enhances the deposition of particles, which in turn improves filter performance. It is shown that frequencies ranging from 200 to 1000 Hz (intensity 120 dB) increase particle deposition up to 2.5 times. Besides, the manner in which fibres are distributed in the porous material and the filter porosity affect considerably the number of particles deposited, for filters subjected to the same filtration velocity.