Search results for " effect"
showing 10 items of 7524 documents
FACTORS AFFECTING THE SPECTROPHOTOMETRIC QUANTIFICATION OF FLAVONOIDS IN WINE
2019
The quantification of flavonoids in wine and grape skin extract by spectrophotometric evaluation at 280 nm wavelength provides essential information to oenologist concerning wine composition and evolution, and it is commonly applied in wine labs. The measurement of the absorption peak height at 280 nm reported by DI STEFANO and GUIDONI (1989) allows to selectively quantify flavonoids with minor interferences. However, it has proved to be susceptible to SO2 at low pH or acetone in unpurified grape skin extracts. Moreover, the effect of pH on flavonoids quantification in wine, either containing SO2 or not, has not been assessed. The effect of SO2, purification, pH and dilution solvent on spec…
The effect of inbreeding rate on fitness, inbreeding depression and heterosis over a range of inbreeding coefficients
2014
Understanding the effects of inbreeding and genetic drift within populations and hybridization between genetically differentiated populations is important for many basic and applied questions in ecology and evolutionary biology. The magnitudes and even the directions of these effects can be influenced by various factors, especially by the current and historical population size (i.e. inbreeding rate). Using Drosophila littoralis as a model species, we studied the effect of inbreeding rate over a range of inbreeding levels on (i) mean fitness of a population (relative to that of an outbred control population), (ii) within‐population inbreeding depression (reduction in fitness of offspring fro…
Inter-crystal scatter in positron emission tomography: Identification techniques and effects on reconstructed images for AX-PET demonstrator
2012
La PET es una técnica de imagen en medicina nuclear que permite la visualización in-vivo y en 3D de procesos funcionales en seres vivos. Un escáner PET mide los rayos gamma producidos al aniquilarse un positrón, el cual es emitido por un radioisótopo inyectado al paciente. La eficiencia del sistema es una característica crucial de los escáneres PET de alta resolución dedicados a la imagen del cerebro o de animales pequeños con el fin de obtener una imagen más fiel o de reducir la actividad del radiotrazador, y por consiguiente, la dosis inyectada al paciente. El objetivo de este trabajo de investigación es mejorar la eficiencia y calidad de imagen de un prototipo de escáner PET axial (AX-PE…
The acute effects of different high-intensity conditioning activities on sprint performance differ between sprinters of different strength and power …
2021
The purpose of the present study was to examine the effect of different conditioning activities (CAs) on short-term increase in sprint performance. In twelve male sprinters (21.1+2.6 years, 100 m performance: 11.5+0.6 s) their body composition, half squat maximum strength, 100 m sprinting and countermovement jump performances were evaluated. The performance of a 50 m sprint (splits at 10 m, 30 m and 50 m) was evaluated before and 5, 10 and 15 min after four postactivation performance enhancement CAs on different occasions: [1] 3 sets x 4 s maximum isometric half squat (IHF), [2] 3 sets x 3 consecutive countermovement jumps (cCMJs), [3] 3 repetitions x 30 m overspeed sprinting (OVSP) and [4]…
Heavy-Ion-Induced Degradation in SiC Schottky Diodes : Incident Angle and Energy Deposition Dependence
2017
Heavy-ion-induced degradation in the reverse leakage current of SiC Schottky power diodes exhibits a strong dependence on the ion angle of incidence. This effect is studied experimentally for several different bias voltages applied during heavy-ion exposure. In addition, TCAD simulations are used to give insight on the physical mechanisms involved. peerReviewed
L'inquietudine dell'uomo fra prassi e tecnica
2017
The essay questions the relationship between prassi and techne in today's fully-tech society. The analysis moves from the aristotelian distinction between the various epistemai and continues through the comparison with the heideggerian idea of the root of knowing in the effectivity of existence, and with the gadameric perspective that highlights the similarities and differences between techne and praxis by bringing out at the same time the peculiarities of an irreducible knowledge of the technique.
Prenatal exposure to diazepam and alprazolam, but not to zolpidem, affects behavioural stress reactivity in handling-naïve and handling-habituated ad…
2002
A gentle long-lasting handling produces persistent neurochemical and behavioural changes and attenuates the impairment in the behavioural reactivity to novelty induced by the prenatal exposure to diazepam (DZ) in adult male rat progeny. This study investigated the consequences of a late prenatal treatment with three GABA/BDZ R agonists (DZ) alprazolam (ALP) and zolpidem (ZOLP)), on different stress-related behavioural patterns, in non-handled (NH), short-lasting handled (SLH) and long-lasting handled (LLH) adult male rats exposed to forced swim test (FST), acoustic startle reflex (ASR) and Vogel test (VT). The effects on motor activity were evaluated in the open field and in the Skinner box…
Rodzinne determinanty wyborów edukacyjno-zawodowych w świetle założeń teorii kolejności narodzin
2019
W środowisku rodzinnym rozpoczyna się faktyczny proces preorientacji i wstępnej orientacji zawodowej. Poprzez wychowanie przez pracę i wprowadzanie dzieci w świat zawodów rodzice starają się przygotować młode osoby do podejmowania właściwych i trafnych wyborów edukacyjno-zawodowych wobec wymagań dynamicznie zmieniającego się rynku pracy. Celem prowadzonych badań była analiza uwarunkowań rodzinnych wyborów edukacyjno-zawodowych dzieci, w tym efektów kolejności narodzin jako czynnika formującego i różnicującego aspiracje oraz preferencje zawodowe przedstawicieli poszczególnych pozycji w rodzeństwie. W badaniach retrospektywnych prowadzonych metodą sondażu diagnostycznego przy użyciu autorskie…
Trans -Cyclooctene-Functionalized PeptoBrushes with Improved Reaction Kinetics of the Tetrazine Ligation for Pretargeted Nuclear Imaging
2020
Tumor targeting using agents with slow pharmacokinetics represents a major challenge in nuclear imaging and targeted radionuclide therapy as they most often result in low imaging contrast and high radiation dose to healthy tissue. To address this challenge, we developed a polymer-based targeting agent that can be used for pretargeted imaging and thus separates tumor accumulation from the imaging step in time. The developed targeting agent is based on polypeptide-graft-polypeptoid polymers (PeptoBrushes) functionalized with trans-cyclooctene (TCO). The complementary In-111-labeled imaging agent is a 1,2,4,5-tetrazine derivative, which can react with aforementioned TCO-modified PeptoBrushes i…
Diabēta medikamentu blakusparādības
2016
Ievads: Vēljoprojām ir sastopamas nozīmīgas blaknes diabēta zālēm, kas ir īpaši nozīmīgi pieaugot saslimstībai ar diabētu pasualē, kā arī Latvijā. Atpazīt diabēta medikamentu izraisītās blaknes ir svarīgi, lai novērstu smagās komplikācijas, ko tās var radīt. Pētijuma mērķis: pētījuma mērķis bija konstatēt blakņu esamību hospitalizētajiem diabēta pacientiem. Materiāli un Metodes: pētījumi, iekļāva pacientus, kuri diagnozticēti ar diabetes mellitus. Pacienti tika iztaujāti par medikamentiem, kurus viņi lieto atveseļošanās periodā un par viņu zināmām vai nezināmajām novērotajām blaknēm. Rezultāti: Pētījumā tika iekļauti 50 pacienti, ar abu, 1. un 2. tipa diabētiem. Pētāmo pacientu grupa sastāv…