Search results for "table"
showing 10 items of 2807 documents
Modeling of an annular photocatalytic reactor for water purification: oxidation of pesticides.
2004
Photocatalytic oxidation (PCO) over titanium dioxide (TiO2) is a “green” sustainable process for the treatment and purification of water and wastewater. However, the application of PCO for wastewater treatment on an industrial scale is currently hindered by a lack of simple mathematical models that can be readily applied to reactor design. Current models are either too simplistic or too rigorous to be useful in photocatalytic reactor design, scale-up, and optimization. In this paper a simple mathematical model is presented for slurry, annular, photocatalytic reactors that still retains the essential elements of a rigorous approach while providing simple solutions. The model extends the appl…
The effect of orally administered probiotic Lactobacillus reuteri -containing tablets in peri-implant mucositis: a double-blind randomized controlled…
2015
Background and Objectives Probiotics create a biofilm and protect the oral tissues against the action of periodontal pathogenic bacteria. The aim of this study was to evaluate the effects of the oral probiotic Lactobacillus reuteri Prodentis upon the peri-implant health of edentulous patients with dental implants and peri-implant mucositis, establishing comparisons vs implants without peri-implant disease. Material and Methods A double-blind, placebo-controlled, prospective cross-over study was made. The patients were all edentulous and were divided into two groups, (A) no peri-implant disease, and (B) peri-implant mucositis affecting one or more implants. Patients with peri-implantitis wer…
High Performance Liquid Chromatografy-Mass Spectrometry based chemometric characterization of olive oils
2005
In this study the effective discrimination of extra virgin olive oils is described using HPLC-MS, combined with chemometric evaluation. The presented method is simple since the diluted oil sample is directly injected into the system, without any preliminary chemical derivatization or purification step. Separation of diacylglycerols, triacylglycerols and sterols occurs within 20 min and is achieved using an octadecyl-silica column. Detection is performed by positive APCI mass spectrometry which provided sensitivity to detect over 50 compounds in the sample. After extraction of data, stepwise discriminant function analysis is used to select the variables with the highest discriminative power.…
Immune-mediated change in the expression of a sexual trait predicts offspring survival in the wild.
2011
9 pages; International audience; BACKGROUND: The "good genes" theory of sexual selection postulates that females choose mates that will improve their offspring's fitness through the inheritance of paternal genes. In spite of the attention that this hypothesis has given rise to, the empirical evidence remains sparse, mostly because of the difficulties of controlling for the many environmental factors that may covary with both the paternal phenotype and offspring fitness. Here, we tested the hypothesis that offspring sired by males of a preferred phenotype should have better survival in an endangered bird, the houbara bustard (Chlamydotis undulata undulata). METHODOLOGY/PRINCIPAL FINDINGS: We…
Modeling the isothermal inactivation curves of Listeria innocua CECT 910 in a vegetable beverage under low-temperature treatments and different pH le…
2015
Thermal inactivation kinetics of Listeria innocua CECT 910 inoculated in a vegetable beverage at three pH conditions (4.25, 4.75, and 5.20), four levels of temperature (50, 55, 60, 65℃), and different treatment times (0–75 min) were obtained. Survival curves did not follow a log-linear relationship and consequently were fitted to various mathematical models: Weibull, Geeraerd, Cerf with shoulder, and the modified Gompertz equation. Results indicated that the best model for the treatment conditions was the modified Gompertz equation, which provides the best goodness-of-fit and the lowest Akaike information criterion value. Sensitivity analysis indicated that the most influential factors affe…
Ensuring Sufficient Literacy Practice with Tablet Technology in Zambian Schools
2015
Tablets are a promising mobile device for disseminating e-Learning materials at schools in Africa. E-learning materials can be especially useful for the practice of early literacy skills. Introducing mobile devices to schools can be challenging as teachers are required to make changes to their daily routines and the use of technology can be problematic in overcrowded classrooms. This study aimed to find out the most optimal way of providing GraphoGame literacy intervention via tablets for grade one learners in an urban school environment. The study tested whether GraphoGame mounted on tablets increases initial literacy skills among grade one learners. Three different conditions for providin…
La ficción como elemento didáctico en la Visión deleytable de Alfonso de la Torre
1994
La Visión deleytable de Alfonso de la Torre, fue compuesta a petición del ayo del Príncipe de Viana para instruirlo en artes liberales, filosofía moral y preceptos religiosos. La génesis de la obra la encuadra directamente en la literatura de espejos de príncipes y su condición de compendio doctrinal la vincularía a las enciclopedias. A partir de estas coordenadas se estudian las técnicas narrativas y la ficción como principales factores que acrecientan el didactismo y ejemplaridad de la obra.
From Masurium to Trinacrium: The Troubled Story of Element 43
2005
The first man-made chemical element was that with atomic number 43. It was produced at the University of Californiaâ€sA„A¬Berkeley (by neutron bombardment of a molybdenum plate and was chemically identified at the University of Palermo (Italy) in 1937 by Segre and Perrier. Previous attempts to identify it in natural ore had been unsuccessful, owing to the short life of its isotopes. Notwithstanding, several claims of its discovery had appeared in the chemical literature. The history of this discovery clearly shows the dramatic improvements of chemical analytical techniques and criteria in the first half of 20th century. In 1949 its discoverers proposed to call it technetium, which means pro…
GENETIC BASIS OF THE TRADE-OFF BETWEEN OFFSPRING NUMBER AND QUALITY IN THE BANK VOLE
2004
One of the main tenets of modern life-history theory is the negative relationship (trade-off) between the number and quality of offspring produced. Theory predicts a negative genetic correlation between these traits since both are closely related to fitness of individuals. However, the genetic basis of the trade-off has only been tested to a limited extent in natural populations. We examined whether size and quality of offspring are negatively related to litter size in the bank vole Clethrionomys glareolus. First, we found a significant negative phenotypic correlation between the number and size of offspring at birth in both laboratory and field populations of the bank vole. Second, a large…
Step by step – The neolithisation of Northern Central Europe in the light of stable isotope analyses
2018
Abstract There is a long lasting debate on the nature of the neolithisation process in the northern European lowlands and in southern Scandinavia. Early evidence of domesticates and crop cultivation indicate a transition to farming in this area during the late 5th millennium cal BC. However, there is limited information how this process took place and to what extent the new economy was adopted during the subsequent centuries. Here we present new results of more than 50 stable isotope samples of human remains (13C/15N) from northern Central Europe covering the period from the Mesolithic to the early Bronze Age. They show a high relevance of aquatic resources during the early Mesolithic. Food…