1,720,967 research outputs found
A container for containing and dispensing semi-liquid substances and kit comprising said container
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Determinazione della capacità antiossidanti integrale (IAC) di formulazioni cosmetiche mediante fotochemiluminescenza (PCL)
No full textDeterminazione della capacità antiossidanti integrale (IAC) di formulazioni cosmetiche mediante fotochemiluminescenza (PCL
Green Polymers in Personal Care Products: Rheological Properties of Tamarind Seed Polysaccharide
Full text linkTamarind seed polysaccharide (TSP) is a xyloglucan of vegetable origin, recently proposed for the cosmetic and pharmaceutical market as a “green” alternative to hyaluronic acid. In this study, TSP water dispersions, at different concentrations, were characterized by means of rheological measurements, both in continuous and oscillatory flow conditions. The results were compared with those of hyaluronic acid of two different molecular weights. The results pointed out the close rheological behaviors between TSP and hyaluronic acid with comparable molecular weight. Afterwards, the structural features of binary and ternary polysaccharide associations prepared with TSP, hyaluronic acid (very high MW) and dehydropolysaccharide gum, a modified xanthan gum, with high stabilizing properties, were investigated. The rheological properties were significantly affected by the polysaccharide ratios in the mixture, suggesting that the combination of TSP with other polymers can lead to a modulation of the texture and functional properties of cosmetics
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Effect of lipid modification on stratum corneum permeability
No full textThe stratum corneum (SC), the most superficial layer of the skin, is directly responsible for the skin's barrier function. The SC is composed of dead keratinised cells embedded in a continuous extracellular lipid structure. The skin's function is largely dependent on the SC's water balance. The intercellular lipids in the SC play an important role in the regulation of the skin's water-holding capacity. The modification of the intercellular lipid organisation and composition may impair these properties. The primary aim of this work was to analyse the differences in water sorption and desorption of SC samples with intact and modified lipid structures. Absorption and desorption curves were obtained using a thermogravimetric balance equipped with a controlled humidity chamber. Lower water contents were found for all lipid-modified SC samples. The evaluation of the kinetics of moisture uptake and loss demonstrated that when SC lipids were modified, the resultant samples reached equilibrium in less time and had higher diffusion coefficients, indicative of the deterioration of the SC tissue and higher permeability. TEM visualisation of the samples confirmed the modification of the lipids of the SC samples treated with organic solvents and surfactants
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