121 research outputs found
THE FIRST APPLICATION OF THE BRIGGS-RAUSCHER REACTION FOR MEASUREMENT OF ANTIOXIDANT POWER OF ITALIAN MONOCULTIVAR EXTRA VIRGIN OLIVE OIL SAMPLES
No full textThe amount of melanin pigments was investigated in 95 Peruvian alpaca, representative of six different fleece colours, by means of spectrophotometric assays: SpEM (Spectrophotometric Eumelanin), SpPM (Spectrophotometric Pheomelanin), SpASM (Spectrophotometric Alkali Soluble Melanin), and SpTM (Spectrophotometric Total Melanin). It was found that these melanin pigments were suitable for identifying three homogeneous groups, each consisting of two closely related colours. A low, an intermediate, and a high amount of SpASM, SpTM, and SpPM characterize pinkish grey and light reddish brown, brown and reddish brown, dark reddish brown and black fleeces, respectively. SpEM and SpTM provide a further split within this latter group; higher concentrations of these pigments distinguish black fleece from dark reddish brown. © Copyright T. Cecchi et al., 2011
Is it advisable to store olive oil in PET bottles?
No full textTo assess the role of the container material on the quality of olive oil, literature results concerning the analytical definition of the quality of oils stored in PET or glass bottles were critically reviewed. The performance of active and passive barrier PET containers may move towards that of glass bottles. The influence of storage conditions was also considered: the main factors affecting the sensory quality loss upon storage are light and the initial oil oxygen concentration, aside from the bottle material. Further research needs are anticipated since new active and passive barrier bottles indeed deserve further attention
The first quantitative rating system of the antioxidant capacity of beauty creams via the Briggs-Rauscher reaction: a crucial step towards evidence-based cosmetics
No full textOxidative damage is the primary cause of skin aging. Skin care products are numerous and overwhelming, yet there is certain similarity among different formulations. Moisturizers are ubiquitous and the presence of particular added ingredients supports specific marketing claims. The antioxidant effects of botanical polyphenols possess tremendous marketing appeal, because oxidative stress is caused by an imbalance between the production of reactive oxygen species (ROS) and the skin ability to neutralize them. The concept of evidence-based cosmetics lacks a widely accepted method to estimate the antioxidant capacity of the beauty cream. This was the motive force of the present study: for the first time we put forth a quantitative rating system of skin care products. The overall antioxidant power of 75 widely used and advertised beauty creams was comparatively measured via the oscillating Briggs-Rauscher (BR) reaction. Many dermocosmetic products confirmed their ability to ensure protection against free radicals, even if differences among various creams are striking and often not correlated with the their price. The method we developed is simple and cheap and it can allow dermatologists and consumers to compare and choose effectively; on the other hand, producers can used this method to select the most active antioxidant cosmetic agent to optimise the product performance
Les edats d’«In memoriam»
No full textRemarks on "In memoriam", the largest poem by Gabriel Ferrater, nn the occasion of the 100th birth anniversary of the author
Organotin(IV) polypyrazolylborates. VIII Hydridotris (4-chloro-3,5-dimethyl-1H-pyrazol-1-yl)borates. Characterization, Mössbauer study and X-ray crystal structures of [SnCl3{HB(4-Cl-3,5-Me2Pz)}3] and [PhSnCl2{HB(4-Cl-3,5-Me2Pz)}3]
No full textFive tin(IV) and organotin(IV) hydridotris(4-chloro-3,5-dimethyl-1H-pyrazol-1-yl)borates have been synthesized and characterized by 1H, 13C and 119Sn NMR and 119mSn Mössbauer spectroscopy. The tin atom has a more or less distorted octahedral coordination both in the solid state and in solution. The X-ray crystal structures of trichlorotin(IV) and dichlorophenyltin(IV) hydridotris [4-chloro-3,5-dimethyl-1H-pyrazol-1-yl)borates confirm these inferences
Impact of photovoltaic technology and feeder voltage level on the efficiency of façade building-integrated photovoltaic systems
No full textsponsorship: This project receives the support of the European Union, the European Regional Development Fund ERDF, Flanders Innovation & Entrepreneurship and the Province of Limburg. This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 751159. Special thanks goes to C. Sheehan from Bourns for providing the required inductor specifications. Patrizio Manganiello was previously with IMEC, Kapeldreef 75, Leuven, Belgium. (European Union, European Regional Development Fund ERDF, Flanders Innovation & Entrepreneurship, Province of Limburg, European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie|751159, Marie Curie Actions (MSCA)|751159)status: Published onlin
Modulatory effects of transcranial direct current stimulation (tDCS) on words and non-words reading task
No full textTITLE:
Modulatory effects of transcranial direct current stimulation (tDCS) on words and non-words reading task
AUTHOR(S):
Margherita Forgioneb, Patrizio Tressoldi b, Daniela Mapelli b, Paulo Sergio Boggio a
a Centro de Ciências Biológicas e da Saúde, Universidade Presbiteriana Mackenzie, Sao Paulo
b Dipartimento di Psicologia Generale, Università degli Studi di Padova, Italia
INTRODUCTION:
In recent past tDCS has gained much attention for rehabilitation purposes. Moreover, few studies have been conducted to investigate its efficacy on reading process. The aim of these studies was to investigate the role of left and right posterior temporal cortex in words and non-words reading process, through tDCS. We focused on the online task to see if it can influence the subjects’ performance. We hypothesized that the anodal stimulation would facilitate the task execution compared to sham and cathodal, in terms of reaction times and accuracy.
METHOD:
Twenty good readers were tested in 3 sessions (sham, anodal, cathodal), with different online task (text reading or music listening). tDCS was applied bilaterally over posterior temporal lobe, with a current of 1,5 mA, lasting for 20 minutes. Participants had to read aloud words or non-words, before and after stimulation. We recorded reaction times and accuracy for words and non-words, before and after stimulation.
RESULTS:
Regarding reaction times, we found significant effect of cathodal tDCS in short words reading task. Similarly, we also found an improvement in reading accuracy for non-words after tDCS. The online task doesn’t seem to affect the performance.
CONCLUSIONS:
We found a modulatory effect of cathodal tDCS in words reading task, suggesting a compensatory mechanisms of the right hemisphere. To verify this hypothesis, we are investigating different montages, involving left or right hemisphere. Further studies are necessary to understand the modulation effects of this technique, in addition with other methodologies, such as eye tracker, and with clinical sample, in particular dyslexics
Incerta glòria de Joan Sales: viatge entre les edicions i les traduccions
No full textJoan Sales’ Incerta glòria has a complicated textual history, as most of the literature
published in Spain during Franco’s dictatorship. As the novel deals with
the Spanish Civil War according to the losers’ viewpoint it was carefully read by
censors and of course censored. The editions of the novel published after the first
(1956) were continously changed and enlarged by the author who was, at the same
time, the publisher. After the author’s death in 1983, it was his wife who edited
the subsequent editions. It would be necessary therefore to have the text edited
and checked according to textual criticism. The article aims at reconstructing the
textual history of Incerta glòria from an external standpoint
Research on the Automobile Aerodynamic Field at the Politecnico di Torino in the Second Half of the Twentieth Century
No full textWith this paper the author first of all wants to honor the memory of Professor Alberto Morelli with whom he had the privilege of working for many years at the Politecnico di Torino. Morelli radically changed the way of designing car body shapes, while bringing the aspect of reducing the aerodynamic resistance of a vehicle to the attention of car designers. Morelli’s research activity began in the early 1950s and, between the 1950s and 1960s, he designed and built a number of car prototypes, whose coefficient of aerodynamic resistance was substantially reduced compared to that of the cars of that time, sometimes resorting to revolutionary architectures such as a “diamond” arrangement of the wheels. A fundamental step of Morelli's research in the field of vehicle aerodynamics was the Pininfarina full-scale wind tunnel project, which was set up between the end of the 1960s and the beginning of the 1970s, and was inaugurated in 1972: fifty years have therefore passed since that occasion. An impressive result, obtained in the second half of the 1970s, was the maquette of the Pininfarina-CNR car, which had front air intakes, internal flows as well as other external details, such as rear-view mirrors: in this case, the Cx value was 0.20. His activity continued with significant results in the field of car aerodynamics, in particular concerning the interaction between the wakes of the car and of the wheels
STEREOCHEMICAL EFFECTS IN THE GAS-PHASE PINACOL REARRANGEMENT OF CIS-1-METHYLCYCLOHEXANE-1,2-DIOL AND TRANS-1-METHYLCYCLOHEXANE-1,2-DIOL
No full textThe gas-phase pinacol rearrangement of cis and trans-1-methyl-1,2-cyclohexanediols, promoted by D3+ and CnH5+ (n = 1,2), was studied by the radiolytic method in the pressure range 100-760 Torr. Under all conditions, 2-methylcyclohexanone is the predominant product, arising from both substrates via different pinacol rearrangements and successive fast isomerization of the corresponding primary intermediates, e.g., O-protonated 1-methyl-1-cyclopentanecarboxaldehyde. This conclusion is based on kinetic anal. of competition expts. with pinacol as ref. substrate, carried out at high pressure (760 Torr) with or without added base (NMe3, 3 Torr), showing that the pinacol rearrangement rates are markedly dependent on the stereochem. features of the diol. Accordingly, the trans diol rearranges more rapidly than the cis isomer, which in turn isomerizes faster than pinacol, indicating that anti-periplanar CH2 migration to the vicinal tertiary C-OH2+ center in trans diol is over five times faster than H migration in cis diol. Anal. of the relative migrating ability of the different CH2 moieties in trans diol allowed exclusion of appreciable anchimeric assistance in these gas-phase pinacol rearrangements. The results are compared with relevant gas-phase data and with those concerning the same substrates in acidic soln
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