Thermal decomposition of ammonium paratungstate 5[(NH4)2O] 12WO3.4H2O has been studied by differential scanning calorimetry and thermogravimetry. The results suggest that the water is lost in two steps at the temperature region 318.7 - 441.3 K, while anhydrous ammonium paratungstate is converted...

The mid-infrared emission of low phonon (963 cm−1) lead silicate glass system with Ho3+/Tm3+ co-doped has been investigated. Luminescence at ∼2.1 μm corresponding to 5I7 → 5I8 transition in holmium was obtained by energy transfer between Tm3+ and Ho3+ ions. Energy transfer mechanism between t...

In the last years the interest for protection of the historical objects has increased. Among them a high number of ancient and middle age objects were made from lead silicate glasses. Such historical objects from glass contain small quantities (below 5 wt%) of transitional elements as Cu, Ag, Fe...

Er3+/Ho3+ co-doped lead silicate glasses with superior thermo-mechanical and chemical properties are synthesized. Efficient 2.0 μm emission of Ho3+:5I7 → 5I8 sensitized by Er3+ ions from the prepared glasses is obtained under 980 nm laser diode pumping. Energy transfer mechanism between Er3+ a...

Viscosity, density and glass transition temperature measurements were performed on the simple PbO-SiO2 system with increasing PbO content from 5 to 70 mol%. The results of these analyses have been complemented by spectroscopic studies (Raman & X-ray Absorption Spectroscopy) in order to link macr...

This work is intended to report large number of pertinent studies covering several aspects of studies (viz., spectroscopic, higher order non-linear optical studies and positron annihilation spectroscopic studies) on lead zirconium silicate glass ceramics admixed with different contents of MnO. L...

Herein we provide full details of studies which culminated in the first total synthesis of the polyene macrolide dermostatin A, confirming our earlier stereochemical assignment. A highly convergent synthesis was developed, featuring the cyanohydrin acetonide method for polyol construction and a ...

Barley starch citrate (BSC), a type IV resistant starch (RS) is associated with numerous health benefits when incorporated in bakery products. Physicochemical, pasting and rheological properties of the wheat starch (WS) and wheat starch-barley starch citrate (WS-BSC) blends and textural and sens...

The effects of amino acids – cysteine (Cys), glutamic acid (Glu) and lysine (Lys) – on gelatinization, pasting and rheological properties of chemically modified starches including distarch phosphate (E 1412), acetylated distarch phosphate (E 1414) and acetylated distarch adipate (E 1422) were ...

Starch phosphate as a novel adsorbent was synthesized for the removal of lead from aqueous media and characterized by BET, BJH, SEM, EDX, XRD, and FTIR techniques. SEM measurements demonstrated that the particle size of the synthesized starch was about 10 μm. XRD analysis showed that there is n...

Starch phosphate esters are crucial in starch metabolism and render valuable functionality to starches for various industrial applications. A potato glucan, water dikinase (GWD1) was introduced in tubers of two different potato genetic backgrounds: an amylose-containing line Kardal and the amylo...

Core-shell magnetic seeds with certain adsorption capacity that were prepared by sulfated roasting, served as the core of a magnetic separation technology for purification of starch wastewater. XRD and SEM results indicate that magnetite's surface transformed to be porous α-Fe2O3 structure...

Monostarch monophosphates with different phosphorus contents were prepared via reacting starch with a mixture of primary and secondary sodium phosphates under weak acidic conditions in a semi-dry process. For a structural characterisation of starch phosphates 31P NMR and FT Raman spectra were re...

The thermal degradation of ammonium starch phosphate carbamates (SPC) with varying degrees of substitution (DS) was analyzed using differential scanning calorimetry and thermogravimetry coupled with Fourier-transformed infrared spectroscopy. The data were analyzed with regard to the structural f...

Native and cross-linked normal maize starch were heated in water, a solution of one of 9 hydrocolloids (HC), sodium sulfate, sodium nitrate, or PEG. Determined were pasting, paste, and dynamic rheology attributes. The overall conclusion was that the various HC interacted to different degrees wit...

The unripe banana has been studied as a potential source of starch for use in various applications. Considering the importance of phosphorus in the biosynthesis of the starch and also the interference of this mineral in starch properties, in this study it was evaluated the effect of rates of pho...

The use of natural phosphate rock as a source of phosphorus for plant growth is considered more environmentally friendly, compared to conventional chemical fertilizers. However, the very low solubility of the phosphate present in natural rocks limits its practical application. To overcome this l...

Microbial corrosion of the external surface of carbon steel pipes was investigated using sodium tungstate, sodium nitrite and zinc nitrite as individual and combined inhibitors. The study involved carbon steel pipes in contact with Acidithiobaccillus thiooxidan. Inhibitor efficiencies were deter...

Recent toxicological findings and expected lower regulatory limits for chromate (hexavalent chromium, Cr(VI)) in drinking water enforce the search for practical treatment options for efficient Cr(VI) removal. Cr(VI) adsorption and chemical reduction of highly soluble Cr(VI) to much less soluble ...

Lead (Pb) is an important pollutant and is released into the environment in many forms. Different lead compounds have a variety of solubilities and so may impact on lead bioavailability and toxicity when added to soil. In this experimental study, we investigated the bioavailability of Pb in soil...