Sampling and analysis provide the data for all geochemical interpretation and thus it is imperative that these tasks be performed by trained personnel with insight into possible errors. Different types of containers (glass, or plastic, amber or transparent) and different pre-treatment (filtering, freezing, addition of chemicals) is needed for the various constituents determined. Some constituen...

The aim of the present work was to evaluate effectiveness a heterogeneous photocatalyst based on TiO2 in treatment coal mining drainage which contains variety heavy metals and high concentration sulfates sulfides. photocatalytic behavior commercial reference Sigma Aldrich different materials synthesized using Sol-gel methodology with surface modifications sulfation fluorination processes were a...

Cold extraction methods with ethanol applied to the flavedo of Citrus fruits have been commonly for preparation several liquors. In order obtain optimization and then best ratio functional ingredients in extract, grandis Osbeck (pummelo) was subjected a maceration absolute at room temperature as well 40 °C. The kinetics were monitored by UV–VIS spectroscopy, chemical fingerprint characteristic ...

A method to quick detect concentration of lecithin in eggs, namely microwave digestion spectrophotometry, was established in this research. The homogenate of eggs was treated with absolute ethanol to eliminate phosphate protein in eggs which could possibly affect concentration of lecithin examined. A sample then received a new way of pre-treatment, called microwave digestion, before UV-Vis ...

Peptides are one of the best candidates for drug development due to their high specificity and low toxicity and porphyrins are significant macromolecules in biological systems with important roles. In this works ynthesis of dipeptide (histidine-β-alanine) was done by solid-phase peptide synthesis method (SPPS) and tetrakis(4-sulfonatophenyl)porphyrin (TPPS4) was synthesized by Adler method. The...

Eosin is one of the original dyes of xanthenes derivatives. It is also one of the main derivatives of fluorescein and has brilliant fluorescence. Eosin disodium salt called "Eosin Y" is the most useful form of this compound. In common procedures, eosin is usually obtained by the action of bromine on fluorescein, which has not good yield and purity degree. In this research, it is prepared by the...

Learning a foreign language entails learner to develop special effort or ways of learning acquire the target effectively. This can be achieved through using appropriate strategies. Thus, this article looks at relationship between vocabulary teaching methods and strategies employed by students teachers in secondary schools. Mixed design was used collect quantitative qualitative data. Data were c...

A detailed theoretical analysis is presented of what five utility representations – subjective expected utility (SEU), rank-dependent (cumulative or Choquet) utility (RDU), gains decomposition utility (GDU), rank weighted utility (RWU), and a configural-weight model (TAX) that we show to be equivalent to RWU – say about a series of independence properties, many of which were suggested by M. H. ...

A detailed theoretical analysis is presented of what five utility representations — subjective expected utility (SEU), rank-dependent (cumulative or Choquet) utility (RDU), gains decomposition utility (GDU), rank weighted utility (RWU), and a configural-weight model (TAX) that we show to be equivalent to RWU — say about a series of independence properties, many of which were suggested by M.H.Bi...