Sorption behavior of chitosan nanoparticles for single and binary removal of cationic and anionic dyes from aqueous solution.

In this study, chitosan nanoparticles (ChNs) were used as an adsorbent for single and simultaneous uptake of cationic (methylene blue (MB)) and anionic (methyl orange (MO)) dyes. ChNs were prepared based on the ionic gelation method using sodium tripolyphosphate (TPP) and characterized by zetasizer, FTIR, BET, SEM, XRD, and pH. The studied parameters that affect removal efficiency included pH, time, and dyes' concentration.

Effective Atomic Number and Electron Density Determination for Fricke Gel Dosimeters Using Different Methods.

The effective atomic number and electron density of some Fricke gel dosimeters were calculated for photon interaction in the energy range from 10 keV to 1000 MeV using Auto-Z, direct and power law methods. The results are presented relative to those of water to allow direct comparison. It is found, that the effective atomic numbers and effective electron densities calculated with the Auto-Z and direct methods, demonstrates a good agreement in the energy interval extending from 0.

PERFORMANCE TESTING OF EYE LENS DOSEMETER AND EVALUATION OF PERSONAL RADIOLOGICAL EXPOSITION AT DOUERA ORTHOPEDIC INTERVENTIONAL SERVICE.

The radiological monitoring of the eye in the workplace depends on the type of dosemeter used and its performance. The dosimetric performances of Nuclear Research Center of Algiers (CRNA) developed eye lens dosemeter (Larabi-Harfouche et al. Characterization and qualification of a CRNA eye dosemeter.

Analytical method for calculating the efficiency and solid angle of an NaI(Tl) detector.

An approach for calculating the detection efficiency of gamma-ray detectors, based on the calculation of the influx/outflux balance of the photons through the detector, is presented. This method can be applied to several simple geometrical configurations. The method is also used to estimate the solid angle of a detector.

Study of coincidence summing effect using Monte Carlo simulation to improve large samples measurement for environmental applications.

A new measurement model composed of High Purity Germanium detector HPGe including Lead Shield with a mixed source of Am-241, Cd-109, …in a soil matrix packed in a cylindrical container was developed by Monte Carlo N-Particles code MCNP5. The Monte Carlo models being largely used for efficiencies calculations in routine environmental radioactivity measurements of high volume soil samples. In order to validate the simulation, a multi-radionuclides soil matrix source in a cylindrical container is prepared.

Characterization of ferrous-agarose-xylenol gel dosimeter at Co γ-rays beam therapy unit.

Fricke gel dosimetry is a valuable technique used for recording 3D dose distribution in radiotherapy. Herein, we present the dosimetric characteristics of a synthesized ferrous-agarose-xylenol orange gel dosimeter in a clinical Co beam. Experimental data were obtained using a secondary standards dosimetry laboratory Co therapy unit.

Synthesis and luminescence spectroscopy study of a novel orange-red colour emissions phosphor based on Tb ion-doped Na ZnP O.

Here, we report the synthesis and study of new orange-red (OR) colour-emitting phosphors Na ZnP O :xTb (x = 1, 1.25, 1.5, and 1.

In Vitro Cytotoxicity of Parasporins from Native Algerian Bacillus thuringiensis Strains Against Laryngeal and Alveolar Cancers.

Parasporins (PS), a class of non-insecticidal and non-hemolytic crystal proteins of Bacillus thuringiensis (Bt), are being explored as promising anti-cancer agents due to their specific toxicity to cancer cells. This work is considered as a first initiative aiming at investigating Algerian soil Bt isolates' activity and cytotoxic potential against cancer cells. A total of 48 Bacillus spp.

Synthesis, Luminescence, and Energy Transfer Properties of YPO:Gd, Eu and YPO:Sm, Eu Phosphors.

This work is concerned with the search for new luminescent materials emitting in the orange-red color. We have synthesized YPO doped with Gd0.25% and/or Eu0.

The synergistic effect of gamma irradiation and alkaline soaking at low temperature on the pre-deacetylation of α-chitin: Optimization by design of experiment.

The effect of gamma irradiation and alkaline soaking time at low temperature (4 °C) as a pretreatment of α-chitin before its N-deacetylation and the effect temperature, NaOH concentration and the reaction time traditionally used during the deacetylation process were studied by applying a factorial experimental design. The top and bottom levels applied for each factor were 1-25 kGy for γ irradiation dose, 2-18 hours for alkaline soaking time at low temperature (4 °C), 50-85 °C for temperature, 35-60% for NaOH concentration and 30-90 min for reaction time. The measured response of deacetylation degree (DD) was determined by FTIR.

Development of alginate gel beads with a potential use in the treatment against acute lead poisoning.

The objective was to develop alginate beads that could adsorb lead ions in gastric pH, in view to preconize their use in gastric lavage following lead poisoning. The swelling measurements of both, dry and hydrated beads, were carried out in simulated gastric fluid (SGF). The sorption kinetics was examined at lead concentrations ranging from 50 to 200mg/l.

Morphological and phylogenetic diversity of thermophilic cyanobacteria in Algerian hot springs.

Geothermal springs in Algeria have been known since the Roman Empire. They mainly locate in Eastern Algeria and are inhabited by thermophilic organisms, which include cyanobacteria forming mats and concretions. In this work, we have investigated the cyanobacterial diversity of these springs.

Oral delivery of insulin from alginate/chitosan crosslinked by glutaraldehyde.

Insulin is mainly administered via subcutaneous route by injection which is the cause of painful and possible infections. Oral insulin administration would present a more convenient form of application because it is less invasive. Oral delivery of insulin to the gastrointestinal tract is one of the most challenging issues, because it numerous barriers to overcome in order to create an effective system for insulin delivery.

Influence of some factors affecting antibacterial activity of PVA/Chitosan based hydrogels synthesized by gamma irradiation.

Poly (vinyl alcohol) hydrogels containing different concentrations of chitosan with molecular weight of 471 and 101 kDa were crosslinked by gamma irradiation at a dose of 25 kGy. The swelling behavior, gel content and morphological structure of the blend were investigated. The antibacterial effect, as a function of chitosan content and molecular weight in the hydrogel, was investigated against Escherichia coli and Bacillus subtilis.