Search results for "Preparation"
showing 10 items of 939 documents
Single hollow fiber SLM extraction of polyamines followed by tosyl chloride derivatization and HPLC determination
2007
Determination of polyamines in biological fluids possesses medical diagnostic relevance. Despite the vast panel of analytical methods developed for polyamines they are not applied in routine clinical usage, mainly due to the time and labor consuming sample preparation step and complicated derivatization procedures. Thus, new simpler methods are needed. This paper describes a single hollow fiber SLM extraction method of polyamines followed by simple pre-column derivatization with tosyl chloride and HPLC-UV analysis. The influence of different parameters such as the extraction time, organic phase composition, acceptor pH, donor pH, acceptor volume, donor volume and stirring speed on the trans…
Teacher Educators’ Views on Inclusive Education and Teacher Preparation in Ghana
2016
The crucial role of initial teacher education programmes and teacher educators in preparing effective inclusive practitioners has been universally acknowledged. This study explored the attitudes of 125 teacher educators from four colleges of education towards inclusive education, their views and concerns about teacher preparation and the implementation of inclusive education in Ghana. The study found positive attitudes and considerable support for inclusive education. However, the majority of teacher educators were of the view that Ghana was inadequately prepared for the implementation of inclusive education. Their reasons and concerns were generally found to include: inadequate teacher pre…
A discourse on human hair fibers and reflections on the conservation of drug molecules
1996
A gross discourse on human hair fibers and their formation is presented stressing the various interdisciplinary aspects, such as the morphological, biological, structural and biochemical data considered to be important in the field of hair analysis. An attempt is made to explain the incorporation of drug molecules during hair fiber formation by using the classical concepts of drug absorption based on lipoid theory and the pH-partition hypothesis as well as a modern biological approach on the permeability of cell membranes. In addition to the physiochemical considerations of the transport properties of a particular drug molecule such as a) the lipophilicity, which determines permeability thr…
Eco-friendly cavity-containing iron oxides prepared by mild routes as very efficient catalysts for the total oxidation of VOCs
2018
Iron oxides (FeOx) are non-toxic, non-expensive and environmentally friendly compounds, which makes them good candidates for many industrial applications, among them catalysis. In the present article five catalysts based on FeOx were synthesized by mild routes: hydrothermal in subcritical and supercritical conditions (Fe-HT, Few200, Few450) and solvothermal (Fe-ST1 and Fe-ST2). The catalytic activity of these catalysts was studied for the total oxidation of toluene using very demanding conditions with high space velocities and including water and CO2 in the feed. The samples were characterized by X-ray diffraction (XRD), scanning and high-resolution transmission electron microscopy (SEM and…
ANALYTICAL PROCEDURES FOR THE DETERMINATION OF TRACE AMOUNTS OF XENOBIOTICS IN ENVIRONMENTAL WATER SAMPLES
2016
Wciąż wzrastające zanieczyszczenie środowiska związane z działalnością człowieka stanowi poważny problem ekologiczny współczesnego świata. Ksenobiotyki to substancje obce i potencjalnie szkodliwe dla organizmów żywych. Obecność niektórych z nich w środowisku wodnym może nieść za sobą poważne konsekwencje. Do najbardziej niebezpiecznych należą antybiotyki oraz pestycydy. Rozwój nauki i techniki umożliwił kontrolowanie tych substancji w środowisku naturalnym. Oznaczanie śladowych ilości ksenobiotyków w próbkach wód środowiskowych jest złożonym procesem, wymagającym zastosowania odpowiedniej metody ekstrakcyjnej i analitycznej. Złożoność matrycy oraz obecność substancji współobecnych stanowi d…
Les débats devant la commission d'esclavage
2010
On March 4, 1848, thanks to the decisive impetus given by Victor Schoelcher, the principle of the abolition of slavery was proclaimed by decree and a « Commission for the preparation of an act of immediate emancipation in all the colonies of the Republic » was established. Like the commission de Broglie under the July Monarchy, the commission, chaired by Schoelcher, provided a huge work of documentation, information and reflection on the settlements, studying also the organization of the English colonies. However, unlike the previous one, the commission of 1848 required the immediate abolition of slavery (Decree of April 27, 1848), without waiting for the election of the National Assembly, …
APPLICATION OF SELECTED LACTIC ACID BACTERIA FOR THE YEAR-ROUND PRODUCTION OF VASTEDDALIKE CHEESE
2014
Vorbereitung von Austauschstudierenden auf ein Studium in einem deutschsprachigen Land : Ein textsortenorientiertes Blended-Learning-Konzept
2023
Deutschland ist nach wie vor das beliebteste Zielland finnischer Studierender, und das wichtigste Motiv für die Wahl eines deutschsprachigen Gastlandes ist, Deutsch zu lernen. In diesem Beitrag soll das Konzept eines Blended-Learning-Kurses zur Vorbereitung auf ein Austauschstudium in einem deutschsprachigen Land vorgestellt werden. Der Kurs war handlungs- und textsortenorientiert auf den Erwerb mündlicher studienbezogener Fertigkeiten ausgerichtet. Für das E-Learning wurde das deutsche EUROMOBIL-Programm (Euromobil o.J.) verwendet. In den Präsenzphasen hielten die Studierenden mündliche Referate, die im Kurs diskutiert und von den Lehrenden und Vortragenden selbst evaluiert wurden. Im empi…
Extracellular Vesicles as Biological Shuttles for Targeted Therapies.
2019
The development of effective nanosystems for drug delivery represents a key challenge for the improvement of most current anticancer therapies. Recent progress in the understanding of structure and function of extracellular vesicles (EVs)—specialized membrane-bound nanocarriers for intercellular communication—suggests that they might also serve as optimal delivery systems of therapeutics. In addition to carrying proteins, lipids, DNA and different forms of RNAs, EVs can be engineered to deliver specific bioactive molecules to target cells. Exploitation of their molecular composition and physical properties, together with improvement in bio-techniques to modify their content are critical iss…
Triacylglycerol Analysis in Human Milk and Other Mammalian Species: Small-Scale Sample Preparation, Characterization, and Statistical Classification …
2015
In this work, a method for the separation of triacylglycerols (TAGs) present in human milk and from other mammalian species by reversed-phase high-performance liquid chromatography using a core–shell particle packed column with UV and evaporative light-scattering detectors is described. Under optimal conditions, a mobile phase containing acetonitrile/n-pentanol at 10 °C gave an excellent resolution among more than 50 TAG peaks. A small-scale method for fat extraction in these milks (particularly of interest for human milk samples) using minimal amounts of sample and reagents was also developed. The proposed extraction protocol and the traditional method were compared, giving similar results…