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Search Results: 1 - 10 of 490220 matches for " Fábio M.;OGAWA "
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Decomposition of trimethylamine oxide related to the use of sulfites in shrimp
CINTRA, Israel H.A.;OGAWA, Norma B.P.;SOUZA, Maria R.;DINIZ, Fábio M.;OGAWA, Masayoshi;
Ciência e Tecnologia de Alimentos , 1999, DOI: 10.1590/S0101-20611999000300003
Abstract: currently, sulfites are employed on board to inhibit melanosis (blackspot) on crustaceans. however, when used in excess this chemical compound not only can cause adverse reactions in so2-sensitive individuals, but also favors the decomposition of trimethylamine oxide (tmao) into dimethylamine (dma) and formaldehyde (fa), thus compromising the quality of the product, which can be observed mainly through the texture change of the meat after cooking. this study was conducted to verify the increase of the contents of dma and fa by the excessive use of sodium metabisulfite in white shrimp (penaeus schmitti). for laboratory trials, shrimp were beheaded, washed and immersed in a 2% sodium metabisulfite solution for 10 minutes. specimens were stored either on ice and maintained for 48 hours in refrigeration, or stored in a freezer for 48 hours. samples were collected at intervals of 0, 24 and 48 hours, and analyzed for residual so2, tmao, tma, dma and fa. the immersion of shrimp in a 2% sodium metabisulfite for 10 minutes favored the decomposition of tmao which greatly increased the contents of dma and fa. the fa and dma measured in fresh shrimp was low. moreover, the storage of shrimp tails on ice resulted in a significant reduction of the tma, dma, fa and residual so2 contents compared to the specimens under frozen storage.
Decomposition of trimethylamine oxide related to the use of sulfites in shrimp
CINTRA Israel H.A.,OGAWA Norma B.P.,SOUZA Maria R.,DINIZ Fábio M.
Ciência e Tecnologia de Alimentos , 1999,
Abstract: Currently, sulfites are employed on board to inhibit melanosis (blackspot) on crustaceans. However, when used in excess this chemical compound not only can cause adverse reactions in SO2-sensitive individuals, but also favors the decomposition of trimethylamine oxide (TMAO) into dimethylamine (DMA) and formaldehyde (FA), thus compromising the quality of the product, which can be observed mainly through the texture change of the meat after cooking. This study was conducted to verify the increase of the contents of DMA and FA by the excessive use of sodium metabisulfite in white shrimp (Penaeus schmitti). For laboratory trials, shrimp were beheaded, washed and immersed in a 2% sodium metabisulfite solution for 10 minutes. Specimens were stored either on ice and maintained for 48 hours in refrigeration, or stored in a freezer for 48 hours. Samples were collected at intervals of 0, 24 and 48 hours, and analyzed for residual SO2, TMAO, TMA, DMA and FA. The immersion of shrimp in a 2% sodium metabisulfite for 10 minutes favored the decomposition of TMAO which greatly increased the contents of DMA and FA. The FA and DMA measured in fresh shrimp was low. Moreover, the storage of shrimp tails on ice resulted in a significant reduction of the TMA, DMA, FA and residual SO2 contents compared to the specimens under frozen storage.
Ecophysiology of tropical tree crops: an introduction
DaMatta, Fábio M.;
Brazilian Journal of Plant Physiology , 2007, DOI: 10.1590/S1677-04202007000400001
Abstract: in this special issue, ecophysiology of major tropical tree crops, considered here on a broader sense and including species such as banana, cashew, cassava, citrus, cocoa, coconut, coffee, mango, papaya, rubber, and tea, are examined. for most of these crops, photosynthesis is treated as a central process affecting growth and crop performance. the crop physiological responses to environmental factors such as water availability and temperature are highlighted. several gaps in our database concerning ecophysiology of tropical tree crops are indicated, major advances are examined, and needs of further researches are delineated.
Effects of Various Foods Intakes on Plasma Levels of Trans Fatty Acids in Japanese Old Men  [PDF]
F. Shimizu, Y. Ishii, M. Ogawa, T. Takao, S. Koba, A. Takada
Food and Nutrition Sciences (FNS) , 2018, DOI: 10.4236/fns.2018.97059
Abstract: Background: Trans fatty acids are said to be formed by the partial hydrogenation of vegetable oils. Some amounts are produced in digestive organs of ruminants and present in dairy products or meat. In Japan, use of trans fatty acids in the foods is prohibited, thus trans fatty acids must come from foods or microbes in the digestive organs. Methods: Plasma levels of fatty acids including trans forms of healthy old men are measured by gas chromatography and correlations between various foods intakes and plasma levels of trans fatty acids such as palmitoelaidic, elaidic and linoelaidic acids are examined. Results: No correlations between various foods intakes and trans fatty acids were found except between intake of preference drinks such as tea or coffee and plasma levels of palmitoelaidic and linoelaidic acids. Conclusion: Since palmitoelaidic acid is cardioprotective, increase in plasma levels of palmitoelaidic acid may indicate that intakes of tea and coffee may be beneficial for heath by increasing palmitoelaidic acids.
Plasma Fatty Acid Composition in Men over 50 in the USA and Japan  [PDF]
A. Takada, F. Shimizu, Y. Ishii, M. Ogawa, T. Takao, S. Koba, M. R. Carnethon, W. S. Harris
Food and Nutrition Sciences (FNS) , 2018, DOI: 10.4236/fns.2018.96054
Abstract: Background: Coronary heart disease (CHD) rates differ markedly between the US and Japan. Fatty acid profiles have been linked to risk for CHD. Few studies have compared the plasma fatty acid composition, including trans fatty acids, in Japanese and US subjects. Methods: Fasting blood samples were taken from healthy older (>age 50) American (n = 76) and Japanese (n = 44) men, and plasma levels of 23 fatty acids were analyzed by gas chromatography and expressed as a percent of total fatty acids. Results: As expected, plasma levels of long-chain ω3 fatty acids (docosahexaenoic and eicosapentaenoic acids, DHA and EPA) were higher in Japanese men and ω6 fatty acids (e.g., arachidonic acid, AA) were lower compared with American men. Plasma levels of the major industrially-produced trans fatty acids (IP-TFAs; elaidic and linoelaidic acids) were far higher in American men, and levels of the potentially cardioprotective, primarily ruminant-derived trans fatty acid palmitoelaidic acid (POA) were higher in Japanese. Plasma levels of saturated or monounsaturated fatty acids were also higher in the American men. Conclusion: There are multiple differences in plasma fatty acid profiles between American and Japanese older men. The higher levels of DHA and EPA, along with the lower levels of the IP-TFAs, are consistent with the markedly lower risk for coronary heart disease in Japan vs. the US.
Asymptotic distinguishability measures for shift-invariant quasi-free states of fermionic lattice systems
M. Mosonyi,F. Hiai,T. Ogawa,M. Fannes
Physics , 2008, DOI: 10.1063/1.2953473
Abstract: We apply the recent results of F. Hiai, M. Mosonyi and T. Ogawa [arXiv:0707.2020, to appear in J. Math. Phys.] to the asymptotic hypothesis testing problem of locally faithful shift-invariant quasi-free states on a CAR algebra. We use a multivariate extension of Szego's theorem to show the existence of the mean Chernoff and Hoeffding bounds and the mean relative entropy, and show that these quantities arise as the optimal error exponents in suitable settings.
Relationship between propagation direction of gravity waves in OH and OI airglow images and VHF radar echo occurrence during the SEEK-2 campaign
T. Ogawa, Y. Otsuka, F. Onoma, K. Shiokawa,M. Yamamoto
Annales Geophysicae (ANGEO) , 2005,
Abstract: We present the first coordinated observations of quasi-periodic (QP) radar echoes from sporadic-E (Es) field-aligned irregularities (FAIs), OI 557.7-nm airglow, and neutral winds in a common volume over Shigaraki, Japan (34.9° N, 136.1° E) on the night of 5 August 2002 during the SEEK-2 campaign. QP echo altitudes of 90-110 km were lower than usual by 10 km, enabling us to make a detailed comparison among QP echoes, airglow intensity, and neutral wind at around 96 km altitude. Eastward movement of the QP echo regions is consistent with the motions of neutral winds, airglow structures, and FAIs, suggesting that the electrodynamics of Es-layers is fundamentally controlled by the neutral atmospheric dynamics. During the QP echo event, the echo altitudes clearly went up (down) in harmony with an airglow enhancement (subsidence) that also moved to the east. This fact suggests that the eastward-moving enhanced airglow region included an upward (downward) component of neutral winds to raise (lower) the altitude of the wind-shear node responsible for the Es formation. The airglow intensity, echo intensity, and Doppler velocity of FAIs at around 96 km altitude fluctuated with periods from 10 min to 1h, indicating that these parameters were modulated with short-period atmospheric disturbances. Some QP echo regions below 100km altitude contained small-scale QP structures in which very strong neutral winds exceeding 100 m/s existed. The results are compared with recent observations, theories, and simulations of QP echoes. Keywords. Ionosphere (Ionosphere-atmosphere interactions; Ionospheric irregularities; Mid-latitude ionosphere)
Modelos univariados de séries temporais para previs o das temperaturas médias mensais de Erechim, RS Univariate time series methods for forecasting the monthly mean air temperature in Erechim, RS
Leonardo Chechi,Fábio M. Bayer
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/s1415-43662012001200009
Abstract: Este trabalho apresenta uma análise de séries temporais dos dados de temperatura mínima e temperatura máxima mensal da cidade de Erechim, RS; apresenta-se uma compara o de duas classes de modelos tradicionais de previs o, nomeadamente: modelos da classe ARIMA e modelos de alisamento exponencial. Na classe de modelos ARIMA foram selecionados, utilizando-se critérios de informa o, modelos do tipo SARIMA, que consideram a característica sazonal da temperatura do ar; já para os modelos de alisamento exponencial utilizaram-se os modelos Holt-Winters aditivo, em que as constantes de alisamento s o determinadas de forma a minimizar o erro quadrático médio entre valores previstos e observados; esta análise permitiu a identifica o de componentes como sazonalidade e períodos atípicos. Os modelos de previs o foram comparados para diferentes horizontes de previs o, sendo que os modelos da classe ARIMA se mostraram mais acurados. Os modelos ajustados se mostraram adequados para tra ar previs es das variáveis de temperatura do ar, mostrando-se importantes ferramentas para a climatologia agrícola. This paper presents a time series analysis of the minimum and maximum air temperature of Erechim, RS. A comparison between two traditional classes of the forecasting models, namely: ARIMA models and exponential smoothing models is also presented. In the class of ARIMA models using criteria information, SARIMA type models that consider the seasonal characteristics of air temperature were selected, whereas for exponential smoothing models Holt-Winters additive algorithm were used. Smoothing constants are determined to minimize the mean square error between observed and predicted values. This analysis allowed the identification of components such as seasonality and atypical periods. The model predictions were compared for different forecast horizons. The ARIMA class models proved to be more accurate while the adjusted models were adequate for adjusting forecasts of variables of air temperature, being important tools for agricultural climatology.
CyazypyrTM Selectivity for Three Species of Phytoseiid for Coffee and Other Relevant Agricultural Crops in Brazil  [PDF]
Paulo Rebelles Reis, Melissa Alves Toledo, Fábio M. Andrade Silva
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.54032
Abstract:

Mites belonging to the family Phytoseiidae are the most important and most widely studied among predatory mites of phytophagous mites. The phytophagous mites Brevipalpus phoenicis (Geijskes, 1939) (Tenuipalpidae) and Oligonychus ilicis (McGregor, 1917) (Tetranychidae) on coffee (Coffea spp.), are frequently found in combination with the predaceous mites Iphiseiodes zuluagai Denmark & Muma, 1972; Euseius alatus DeLeon, 1966 and Amblyseius herbicolus (Chant, 1959) (Acari: Phytoseiidae), among others. The purpose of this research was to study the effects of the product CyazypyrTM (cyantraniliprole 100 OD) on these three species of Phytoseiidae, relevant to coffee, citrus and other agricultural crops in Brazil, following standard laboratory procedures. Mated female mites were exposed to fresh-dried residues on a glass surface, with 8 treatments, 5 mites per glass plate and 6 replicates, in a completely randomized experimental design. Each test lasted eight days, with a daily count of the surviving females and of eggs laid. CyazypyrTM, in all tested doses (75, 100, 125, 150, 175 and 200 g a.i./ha), was selective for the studied species, A. herbicolus, I. zuluagai, and E. alatus. Overall the treatments resulted in low mortality rates and negligible impact on the reproduction. Therefore, based on IOBC standards, CyazypyrTMcan be classified as not harmful (class 1) or slightly harmful (class 2), comparable to the agrochemical TalentoTM (hexythiazox 500 WP-12 g a.i./ha) equivalent to a harmless standard of selectivity in the laboratory. CyazypyrTM is therefore a complement to programs of integrated pest management, to preserve the populations of predatory mites in crops of coffee and citrus, among others, in Brazil.

Estudo do tratamento do edema macular difuso do diabético com triancinolona intravítrea e fotocoagula??o
Saraiva, Fábio Petersen;Queiroz, Márcia Silva;Costa, Patricia Grativol;Gasparin, Fábio;Nakashima, Yoshitaka;
Arquivos Brasileiros de Oftalmologia , 2008, DOI: 10.1590/S0004-27492008000400005
Abstract: purpose: to assess the efficacy of intravitreal use of triamcinolone acetonide combined with laser photocoagulation for the treatment of diffuse diabetic macular edema and to compare it with the separate use of each treatment. methods: after systemic clinical control, thirty patients with diffuse diabetic macular edema were divided into 3 treatment groups: (1) macular grid photocoagulation; (2) intravitreal injection of 4 mg of triamcinolone acetonide; (3) combination of the two previous therapies. follow-up was scheduled at predetermined intervals of one day, one week and monthly until completion of six months. the following parameters were analyzed: logmar best corrected visual acuity, central macular thickness, total macular volume and intraocular pressure. results: grid photocoagulation did not significantly reduce the central macular thickness or the total macular volume. on the other hand, this reduction was statistically significant in the other two groups. all groups improved their mean visual acuity, however, the group that received both treatments had a higher percentage of patients that gained 10 or more letters. conclusion: the simultaneous administration of grid photocoagulation with intravitreal triamcinolone can be considered an option for the treatment of diffuse diabetic macular edema.
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