Search results for "Tact"
showing 10 items of 1313 documents
The pseudostationary mercury electrode
1998
Abstract A detailed study of the pseudostationary mercury electrode is presented, based on its use in LSV. Delay times ( t 1 ) as short as 20 ms can be employed; the drop area is still given by its classical expression, and minimization of the ohmic drop allows sweep rates of a few thousands of volts per second to be used. The conditions for pseudostationarity are given; the lower sweep rates utilizable are of the order of few tenths of volt per second. Reactant adsorption is considered, and zones where rehomogenization near the electrode surface is practically either 100 or 0% are defined in a plane log t 1 /log b O ( b O is the adsorption coefficient); the diffusional or surface character…
Ohmic drop effect on the voltammetric behaviour of graphite + polyethylene composite electrodes
1997
Graphite + polyethylene composites can be used as electrodes in electrochemical experiments because of their low charging current in contrast with other composite electrodes. However, the results reveal that the ohmic drop must always be considered in the data analysis. The peak potential and the peak current are related through an expression deduced for a Nernstian process where the mass transport is controlled by diffusion. The determination of the uncompensated resistance implies also the calculation of the convolution of the current.
On the use of carrageenan matrices for the development of antiviral edible coatings of interest in berries
2019
Different film-forming dispersions (FFD) based on κ−, ι− and λ− carrageenans and green tea extract (GTE) have been developed as an innovative strategy to guarantee the food safety of blueberries and raspberries. First, the FFD were characterized (surface tension and viscosity) and the physicochemical properties (water vapour permeability-WVP-, water sorption, contact angle, mechanical properties) of the stand-alone films were evaluated. Then, the FFD were applied to refrigerated-stored raspberries and blueberries, and the antiviral activity against murine norovirus (MNV), a cultivable norovirus surrogate, and hepatitis A virus (HAV) of coated fruits was determined at refrigerated (10 °C) an…
Impact of the COVID-19 lockdown on a long-term care facility: the role of social contact
2021
Background: Long-term care facilities (LTCFs) have been harmed by the coronavirus, and older adults have remained isolated for a long time with many restrictions. The aim of this study was to measure the decline in cognitive, functional, and affective status in a care facility after the lockdown in the first wave of the COVID-19 pandemic and to compare it with previous measures in order to determine if this decline was accelerated. (2) Methods: Ninety-eight participants were recruited. Data from three retrospective pre-lockdown assessments and an additional postlockdown assessment were analyzed. Mixed ANOVA analyses were performed according to the Clinical Dementia Rating levels, considerin…
Narrated lived experiences of self-care and health among rural-living older persons with a strong sense of coherence.
2012
Ulrika Söderhamn, Bjørg Dale, Olle SöderhamnFaculty of Health and Sport Sciences, University of Agder, Centre for Caring Research – Southern Norway, Grimstad, NorwayAbstract: Sense of coherence (SOC), with its components comprehensibility, manageability, and meaningfulness, is a major factor in the ability to cope successfully with stressors and is closely related to health. Qualitative studies related to SOC are scarce, and in this phenomenological interview study, self-care is investigated in relation to SOC. The aim of this study was to describe the lived experiences of self-care and features that may influence health and self-care among older home-…
Isolation and characterization of a 60-70-kD plasma membrane glycoprotein involved in the contact-dependent inhibition of growth
1990
Previous studies have shown that plasma membrane compounds are involved in the contact-dependent inhibition of growth of human diploid fibroblasts. The purification of the active plasma membrane glycoprotein is described in this report. The glycoprotein has an apparent molecular mass of 60-70 kD and, due to differential sialylation, isoelectric points between pH 5.5. and 6.2. Treatment with sialidase yielded one spot in two-dimensional gel electrophoresis with an isoelectric point of 6.3. After removal of the N-glycosidically linked oligosaccharide chains, the apparent molecular mass is reduced by approximately 22 kD. Treatment was diluted NaOH, which removes the O-glycosidically linked por…
Contact-dependent inhibition of growth of normal diploid human fibroblasts by plasma membrane glycoproteins.
1988
Homeostasis in vivo is maintained by a highly complex network of positive and negative signals. At the cellular level, this regulatory microenvironment can be divided, in a simplified fashion, into two major compartments: the humoral compartment, including compounds such as hormones, growth factors and nutrients, and the contact-environment compartment, including cell-cell and cell-matrix interactions. At least in cultures of diploid, non-transformed cells, cell-cell and cell-matrix interactions have been shown to be of major importance for the regulation of growth as well as of differentiation. Although until now the glycoprotein involved in the contact-dependent inhibition of growth has n…
Relevance of Interactions between Starch-based Coatings and Plum Fruit Surfaces: A Physical-Chemical Analysis
2019
In order to extend the shelf life of the fruit, improve appearance, and to keep all nutrition properties of the plum from diminishing, edible coatings comprised of wheat starch and wheat starch&ndash
Wetting properties at the surface of iota-carrageenan-based edible films
2006
International audience; Surface properties of edible films composed of a polymeric matrix of carrageenan in association with hydrophobic material were studied by contact angle measurements. The use of this technique not only in a static mode but also in a dynamic way enables investigation of surface hydrophobicity as well as surface wettability. The absorption flux inside the material can be estimated from the wetting kinetic, which can be very useful to quickly compare water barrier efficiency of the tested films. Comparison of carrageenan films with films containing known amounts of additives enables understanding and correlation of changes of the surface properties with the nature of use…
Grammatical changes caused by contact between Livonian and Latvian
2014
The article provides insight into the process of various grammatical changes in Livonian and Latvian that have taken place as a result of prolonged contact between the languages. Livonian is strongly influenced by Latvian at different levels due to the close contact between the speakers of two languages; it is necessary to note that speakers of Livonian were bilinguals for a long time. It is clear that Livonian has affected Latvian in a similar way. The process of mutual borrowings can be observed most clearly in the vocabulary, especially in dialects; however, there are changes that have occurred in the phonetics and grammar as well. Different changes can be found as a result of mutual inf…