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Search Results: 1 - 10 of 266486 matches for " V.H. Tournas "
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Evaluation of the Hydrophobic Grid Membrane Filter for the Enumeration of Moulds and Yeasts in Naturally-Contaminated Foods
V.H. Tournas
Microbiology Insights , 2012,
Abstract: Over 240 food samples from six food groups (tree nuts, grains and grain products, dried fruits, fresh produce, fruit juice, and dairy products) were tested for levels of fungal contamination using the NEO-GRID hydrophobic grid membrane filter (HGMF) and the FDA official (BAM) method. Results showed that HGMF performed very well for all tested commodities giving yeast and mould (YM) counts similar to those of the BAM (reference) method. Statistical analysis of the data (t-test) revealed no significant differences between the two methods for all foods tested. Regression analysis showed that there was a good fit linear relationship between the two methods for most of the commodities examined. Some difficulties were encountered during counting of the colonies on HGMF since the size of the grid is very small and the number of possible colonies per plate can reach 1600.
Evaluation of the Hydrophobic Grid Membrane Filter for the Enumeration of Moulds and Yeasts in Naturally-Contaminated Foods
V.H. Tournas
Microbiology Insights , 2009,
Abstract: Over 240 food samples from six food groups (tree nuts, grains and grain products, dried fruits, fresh produce, fruit juice, and dairy products) were tested for levels of fungal contamination using the NEO-GRID hydrophobic grid membrane filter (HGMF) and the FDA official (BAM) method. Results showed that HGMF performed very well for all tested commodities giving yeast and mould (YM) counts similar to those of the BAM (reference) method. Statistical analysis of the data (t-test) revealed no significant differences between the two methods for all foods tested. Regression analysis showed that there was a good fit linear relationship between the two methods for most of the commodities examined. Some difficulties were encountered during counting of the colonies on HGMF since the size of the grid is very small and the number of possible colonies per plate can reach 1600.
Evaluation of the Hydrophobic Grid Membrane Filter for the Enumeration of Moulds and Yeasts in Naturally-Contaminated Foods
V.H. Tournas
Microbiology Insights , 2009,
Abstract: Over 240 food samples from six food groups (tree nuts, grains and grain products, dried fruits, fresh produce, fruit juice, and dairy products) were tested for levels of fungal contamination using the NEO-GRID hydrophobic grid membrane filter (HGMF) and the FDA official (BAM) method. Results showed that HGMF performed very well for all tested commodities giving yeast and mould (YM) counts similar to those of the BAM (reference) method. Statistical analysis of the data (t-test) revealed no significant differences between the two methods for all foods tested. Regression analysis showed that there was a good fit linear relationship between the two methods for most of the commodities examined. Some difficulties were encountered during counting of the colonies on HGMF since the size of the grid is very small and the number of possible colonies per plate can reach 1600.
Microbiological Quality of Various Medicinal Herbal Teas and Coffee Substitutes
V.H. Tournas,E.J. Katsoudas
Microbiology Insights , 2008,
Abstract: Various herbal teas including German chamomile, Chrysanthemum Vascuflow herb tea, hop, jasmine and orange flowers, sweet marjoram, spearmint and thyme leaves, and papaya-mint tea as well as coffee substitutes (Bambu instant Swiss, Teeccino chocolate-mint, and Teeccino Mediterranean Espresso) were analyzed for fungal contamination and the presence of aerobic mesophilic bacteria (APC). The results of this investigation showed that fungal counts reached levels as high as 5.8 × 105 colony forming units (cfu) per gram. German chamomile harbored the highest fungal contamination. The most common fungi found in herbal teas were Aspergillus niger, Penicillium spp., Eurotium rubrum, E. chevalieri, A. flavus, Fusarium spp., Alternaria alternata, and yeasts. Among the coffee substitutes, only the chocolate-mint coffee was contaminated with low numbers (<1.0 × 103 cfu g 1) of E. rubrum, Ulocladium spp. and Phoma spp., and with yeasts (<100–6.8 × 103 cfu g 1). Aerobic mesophilic bacteria were recovered from 100% of the herbal tea, chocolate-mint and Mediterranean Espresso, and from 50% of the Bambu instant Swiss coffee samples. The highest APC counts of 1.2 × 107 cfu g 1 were observed in spearmint leaves.
Contemporary Issues In Interest Free Banking
V.H.Patil
Indian Streams Research Journal , 2012,
Abstract: Banking Plays an important role in country's economic development. Banks accept deposit from customer and gives Loans and advances to needy persons. Bank charges interest on Loans and advances. In various secular muslim countries special financial Houses were established to offer intrerest free products and services. The special financial Houses only providing financial products and services based on Islamic principles.
Instantaneous Water Demand Parameter Estimation from Accumulated Readings
V.H. Alcocer–Yamanaka,V. Tzatchkov
Ingeniería, investigación y tecnología , 2009,
Abstract: Residential water demand is a highly unsteady stochastic process, defined statistically by the frequency of water use, and intensity and duration of stochastic de mand pulses. Known pro ce dures for obtaining those parameters are based on direct observation of the instantaneous water demand by registering it every second. That direct technique turns out to be impractical because of the enormous amount of data generated and to be processed. A new method for estimating the necessary parameters for simulating the instantaneous water de mand from larger than one second meter readings is presented in this paper. The proposed method considers principles from the Neyman–Scott (N–S) process, such as the disaggregation of the accumulated water volume, based on a comparison between the statistical moments of the observed larger interval demand series and the theoretical moments of the instantaneous water demand. An objective function expressing the relation between both theoretical and observed moments is formulated and minimized by a nonlinear programming technique obtaining the intensity, duration and arrival rate of the instantaneous demand pulses. Using these results in stantaneous water demand series, or demand series with any averaging interval, can be generated. The method is validated by comparing the generated demand series with observed demand series.
Ecophysiological factors underpinning productivity of Hevea brasiliensis
Rodrigo, V.H.L.;
Brazilian Journal of Plant Physiology , 2007, DOI: 10.1590/S1677-04202007000400002
Abstract: high land productivity is a must for any commercial cultivation including hevea brasiliensis (rubber). also, the high demand for natural rubber has placed great pressure on expanding rubber cultivation to new and non-traditional areas. understanding the ecophysiological principles behind the measures of productivity improvements is vital for wide application of these measures and to assess their sustainability. this review discusses the ecophysiological principles and tools used, along with the measures taken, to address productivity needs in terms of: genotype selection, determination of optimum planting density, and establishment of intercropping systems. breeding for high yields and selection of suitable genotypes for different growing conditions are a top priority throughout the research history of rubber, however, early selection tools are necessary to reduce the time required for this process. as for any crop, photosynthesis drives the productivity of the rubber crop and, therefore, factors that govern and/or parameters that indicate the efficiency of photosynthetic productivity under field conditions could be used as tools in the selection of hevea genotypes. particularly for the early selection of genotypes in breeding programmes, mature crop characteristics which determine crop photosynthesis and productivity, should be linked to juvenile plant characteristics. the spatial and temporal efficiency by which plants acquire growth resources determines the overall productivity of the rubber crop, hence the optimum planting density and suitable crop combinations in intercropping systems. changes in crop microclimate influence the efficiency of resource capture and thereby can be important for determining planting density and intercrops. research needs regarding all the above aspects are also discussed.
Analgesic, anti-inflammatory and antipyretic activities of Pergularia daemia and Carissa carandas
V.H Bhaskar,N Balakrishnan
DARU : Journal of Pharmaceutical Sciences , 2009,
Abstract: "nBackground: The plant Pergularia daemia (Asclepiadaceae) and Carissa carandas (Apocynaceae) are traditionally used as a medicinal agent and they are widely distributed to tropical and subtropical region of India. In the present study the folklore uses of P. daemia and C. carandas was investigated. "nMethods: The analgesic activity was studied in mice using hot plate and acetic acid induced writhing methods, while carrageenan induced paw edema was used to access anti-inflammatory activity. The antipyretic activity was evaluated by Brewer's yeast induced pyrexia in rats. "n Results: The ethanol and aqueous extracts from roots of P. daemia and C. carandas exhibited significant (p < 0.01) analgesic, anti-inflammatory and antipyretic activities at the doses of 100 and 200 mg/kg body weight. In analgesic activity, the highest reaction time was observed (9.8 sec.) from ethanol extracts of P.daemia at a dose of 200 mg/kg body weight, while highest percentage of inhibition of abdominal constriction (72.67%) was observed for ethanol extracts of C.carandas at a dose of 100 mg/kg body weight. The ethanol and aqueous extracts of P. daemia and C. carandas were found to reduce significantly the formation of edema induced by carrageenan after 2 hrs. Both plants showed significantly competent on yeast induced hyperpyrexia in rats after 2 hrs. "nConclusion: The results of this study indicated that the ethanol and aqueous extracts from roots of P. daemia and C. carandas possess significant analgesic, anti-inflammatory and antipyretic activities in rodent models.
Depresión respiratoria neonatal y fentanilo intratecal Neonatal Respiratory Depression and Intrathecal Fentanyl
V.H González Cárdenas
Revista Colombiana de Anestesiología , 2012, DOI: 10.1016/s0120-3347(12)70021-7
Abstract: Objetivo: Establecer la prevalencia de depresión respiratoria neonatal en pacientes expuestas a fentanil intratecal durante cesárea. Métodos: Estudio Observacional Retrospectivo Analítico Tipo Corte Transversal realizado en la Clínica Materno-Infantil de la Corporación Saludcoop en pacientes llevadas a cesárea y que recibieron Fentanil intratecal para anestesia regional en los a os 2007 y 2008. Desenlaces primarios: APGAR Bajo (APGAR<7) y APGAR Severo (APGAR<4). Resultados: 2165 Registros de cesáreas y fentanil intratecal con dosis media de 19,21mcg DE=0,206mcg). Prevalencia de APGAR Bajo al nacer al minuto 01=1,77% (DE=0,63%), al minuto 05=0,11% (DE 0,163%), al minuto 10=0%; siendo estos dos últimos valores diferentes al valor del minuto 01 (ANOVA Test Scheffé p=0,031) y sin diferenciarse entre ellos (minutos 5 y 10) (ANOVA p=0,861). APGAR Severamente disminuido al nacer al minuto 1=0,059% (DE 0,058), a los minutos 5 y 10=0%. Los tres valores severamente disminuidos no presentaron diferencias estadísticamente significativas entre sí (ANOVA p=0,861). Conclusiones: La prevalencia de Depresión Respiratoria medido con el test de APGAR al nacer es baja; el compromiso severo del APGAR presenta una tendencia a 0 en todos los minutos de su valoración; aun así es cuestionable la fiabilidad de la herramienta diagnóstica APGAR) al existir discrepancias en el análisis con una escala mucho más sensible para el diagnóstico (Test de Silverman). La importancia de este estudio solo radica como evaluación de prevalencia y fuente de hipótesis de investigación, no como estudio de asociación o predicción. Objective: To establish the prevalence of neonatal respiratory depression in patients exposed to intrathecal fentanyl during Cesarean section. Methods: Cross-sectional Analytical Observational Retrospective Study conducted at the Mother and Child Clinic of the Saludcoop Corporation in patients undergoing C-section who received intrathecal fentanyl for regional anesthesia in 2007 and 2008. Primary endpoints: low APGAR score (APGAR<7) and severe APGAR (APGAR<4). Results: 2165 records of C-sections and intrathecal fentanyl with a mean dose of 19.21mcg (SD=0.206mcg). Prevalence of low APGAR at 1.5 and 10 minutes was 1.77% (SD=0.63%), 0.11% (SD 0.163%), and 0%, respectively. The latter two values were different from the 1-minute value (ANOVA Scheffé Test, p=0.031) and there was no difference between them (minutes 5 and 10) (ANOVA p=0.861). Severely diminished APGAR results were, 0.059% (SD 0.058) 1 minute after birth and 0% at 5 and 10 minutes. There were no statistically sign
Estimación de parámetros del consumo instantáneo de agua potable de lecturas acumuladas
Alcocer-Yamanaka, V.H.;Tzatchkov, V.;
Ingeniería, investigación y tecnología , 2009,
Abstract: residential water demand is a highly unsteady stochastic process, defined statistically by the frequency of water use, and intensity and duration of stochastic de mand pulses. known pro ce dures for obtaining those parameters are based on direct observation of the instantaneous water demand by registering it every second. that direct technique turns out to be impractical because of the enormous amount of data generated and to be processed. a new method for estimating the necessary parameters for simulating the instantaneous water de mand from larger than one second meter readings is presented in this paper. the proposed method considers principles from the neyman-scott (n-s) process, such as the disaggregation of the accumulated water volume, based on a comparison between the statistical moments of the observed larger interval demand series and the theoretical moments of the instantaneous water demand. an objective function expressing the relation between both theoretical and observed moments is formulated and minimized by a nonlinear programming technique obtaining the intensity, duration and arrival rate of the instantaneous demand pulses. using these results in stantaneous water demand series, or demand series with any averaging interval, can be generated. the method is validated by comparing the generated demand series with observed demand series.
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