8 research outputs found
Seasonal variation in the phenol content of Eugenia uniflora L. leaves Variação sazonal nos teores de fenóis de folhas de Eugenia uniflora L
Hydrolysable tannins, total phenols and flavonoids in Eugenia uniflora leaves were monthly analysed for one year. The results were correlated with climate conditions (rainfall, humidity, cloudiness and mean temperature) through chemometric methods. Principal component analysis revealed high levels of hydrolysable tannins in the rainy season, whereas flavonoids were mainly produced in the dry season. These facts suggest that climatic changes may be one of the factors affecting phenol levels in Eugenia uniflora.<br>Taninos hidrolisĂĄveis, fenĂłis totais e flavonĂłides presentes em folhas de Eugenia uniflora foram quantificados mensalmente durante um ano. Os resultados foram correlacionados com as condiçÔes climĂĄticas (pluviosidade, umidade, nebulosidade e temperatura mĂ©dia) atravĂ©s de mĂ©todos quimiomĂ©tricos. AnĂĄlise de componentes principais revelou a ocorrĂȘncia de altos teores de taninos hidrolisĂĄveis durante a estação de chuvas, enquanto os flavonĂłides foram produzidos principalmente na estação seca. Estes fatos sugerem que mudanças climĂĄticas podem ser um dos fatores que afetam os nĂveis de fenĂłis em Eugenia uniflora
Anålise tecidual e celular das brùnquias de Oreochromis niloticus L. tratadas com extrato etanólico bruto e fraçÔes das folhas da pitanga (Eugenia uniflora L.) - Myrtaceae Tissue and cell analysis of Oreochromis niloticus L. gill treated with crude ethanol extract and fractions from pitanga (Eugenia uniflora L.) leaves Myrtaceae
Eugenia uniflora L. (Myrtaceae) Ă© uma planta que ocorre no bioma Cerrado e Ă© utilizada popularmente no tratamento de diarrĂ©ias, inflamaçÔes, hiperglicemia e hipertensĂŁo. Estudos prĂ©vios revelaram atividade antimicrobiana da E. uniflora in vitro. Tendo em vista o uso popular, este trabalho objetivou avaliar as possĂveis atividades celulares e teciduais sistĂȘmicas do extrato bruto e das fraçÔes das folhas dessa planta em brĂąnquias de Oreochromis niloticus L. (tilĂĄpia nilĂłtica). Para isso, o extrato etanĂłlico e as fraçÔes das folhas dessa planta foram administrados no peixe, por via oral, adicionadas Ă ração. ApĂłs um perĂodo de 24 horas, os peixes foram sacrificados e o segundo arco branquial de cada peixe foi dissecado, fixado em formalina neutra, desidratado, incluĂdo em parafina e cortado. Nas anĂĄlises histolĂłgicas, utilizaram-se tricĂŽmico de Masson e hematoxilina e eosina (HE). Pelas anĂĄlises qualitativas na microscopia de luz, concluiu-se que o extrato etanĂłlico bruto e as fraçÔes das folhas da E. uniflora apresentaram efeito sistĂȘmico nas tilĂĄpias nilĂłticas atingindo as brĂąnquias. As açÔes tĂłxicas como destacamento e descamação do epitĂ©lio respiratĂłrio e hiperplasia das cĂ©lulas do epitĂ©lio interlamelar, foram mais pronunciadas nas tilĂĄpias que ingeriram maiores concentraçÔes. Este trabalho colaborou para identificar o efeito vasodilatador dessa planta, e contribuiu para estabelecer a tilĂĄpia nilĂłtica como sistema-modelo para testes com princĂpios ativos de plantas. Espera-se, com esses testes, viabilizar o uso de plantas como medicamentos para tratamentos de peixes, a manutenção da saĂșde de animais em cultivo intensivo e extensivo, a partir do qual se possibilite emprego alternativo aos medicamentos sintĂ©ticos.<br>Eugenia uniflora L. (Myrtaceae) is a plant found in the Cerrado biome and traditionally used in the treatment of diarrheas, inflammations, hyperglycemia and hypertension. Previous studies have revealed in vitro antimicrobial activity of E. uniflora. Considering its popular use, this study aimed to assess possible systemic cellular and tissue activities of the crude extract and the fractions from the leaves of this plant on Oreochromis niloticus L. (Nile tilapia) gill. Thus, ethanol extract and fractions from the leaves of this plant were orally administered to the fish in their rations. After 24 hours, the fish were sacrificed and the second gill arch of each fish was dissected, fixed in neutral formalin, dehydrated, embedded in paraffin and sectioned. Masson's trichome and hematoxylin and eosin (HE) were used in the histological analyses. Qualitative analyses using a light microscope led to the conclusion that the crude ethanol extract and the fractions from E. uniflora leaves presented systemic effect on Nile tilapias, affecting the gills. Toxic actions such as respiratory epithelium detachment and lifting, and hyperplasia of interlamellar epithelial cells were more pronounced in the tilapias that ingested higher concentrations. This study helped to identify the vasodilator effect of this plant and contributed to the definition of the Nile tilapia as a model system for testing plant active principles. These tests are expected to make feasible not only the use of plants as fish medication but also the maintenance of the health of animals in intensive and extensive cultures through the possible use of alternatives to synthetic medication
Participation of Na/Ca-exchanger and sarcoplasmic reticulum in the high [K]o-protection against ischaemia-reperfusion dysfunction in rat hearts
Scaling analysis of time series of daily prices from stock markets of transitional economies in the Western Balkans
In this paper we have analyzed scaling properties of time series of stock market indices (SMIs) of developing economies of Western Balkans, and have compared the results we have obtained with the results from more developed economies. We have used three different techniques of data analysis to obtain and verify our findings: detrended fluctuation analysis (DFA) method, detrended moving average (DMA) method, and wavelet transformation (WT) analysis. We have found scaling behavior in all SMI data sets that we have analyzed. The scaling of our SMI series changes from long-range correlated to slightly anti-correlated behavior with the change in growth or maturity of the economy the stock market is embedded in. We also report the presence of effects of potential periodic-like influences on the SMI data that we have analyzed. One such influence is visible in all our SMI series, and appears at a period T-p approximate to 90 days. We propose that the existence of various periodic-like influences on SMI data may partially explain the observed difference in types of correlated behavior of corresponding scaling functions