Aspects Regarding the Relationship Between the Stability of Six Magnesium Compounds and their Cellular Uptake in Mice

This research establishes the relationship between the influence of the stability of 6 magnesium compounds on their cellular uptake and focuses on the comparation between them, finding out which is the magnesium compound with the best bioavailability, depending on the stability. Mg2+ was dosed from tissues taken from various mice organs after the administration of compounds containing it, during the shelf life of the compounds, respectively at 6/12 months after their expiration. Different quantities of substances were also used � 25/50/100/200/300 mg/day/mouse, in groups of 2 mice for each dose. The samples were administered by gavage, following in parallel the possible side effects that may occur. During the shelf life of the compounds and at 6 months after expiration, in all organs, the lowest value was obtained for magnesium oxide and the highest value was detected for magnesium citrate. At 12 months after expiration, in all organs, the lowest/highest value was obtained in the case of oxide/orotate, respectively. It was found that the highest concentration of magnesium is stored in the spleen and lowest in lungs. The data obtained demonstrated a good stability of the tested substances (indicated by maintaining the cellular uptake rate) even 6 months after the expiration date.

INSECTICIDAL AND FUNGICIDAL ACTIVITY OF A MAGNESIUM COMPOUND CONTAINING ISOVANILLIC ACID AGAINST LEAF-CUTTING ANT AND ITS SYMBIOTIC FUNGUS

Pesticides offer a simple, cost-effective solution to ensure food supplies for a growing world population. However, their environmental performance needs improvement if pesticides are to continue contributing importantly. This study explores the insecticidal potential of a magnesium (II) metal complex containing 1,10-phenanthroline and isovanillic acid (MgPhenIso) against leaf-cutting ant (Atta sexdens rubropilosa) and its symbiotic fungus (Leucoagaricus gongylophorus). The MgPhenIso complex is easy-to-prepare, stable in solid state and in aqueous solution, and resistant to sunlight irradiation. The insecticidal activity of MgPhenIso-containing bait against A. sexdens rubropilosa and L. gongylophorus showed a delayed action mode at 2 mg g-1 (100% kill, 6th day, S50=2b) and suppressed fungus development and growth. These results, together with earlier investigations on MgPhenIso regarding its absence of toxicity to Zebrafish and Wistar male rats, emphasize the potential of this complex as an environmentally friendly insecticide candidate.

Effect of Temperature and Micro structural Evolution of Magnesium and Aluminium Alloy using Vacuum Diffusion Bonding

This work is directed to acquire better understanding and portrayal of the dissemination holding of comparable and disparate metals. It additionally meant to get ideal parameters for dispersion holding of aluminum covering over magnesium compound with Aluminum composite. This work targets building up a basic strategy to get dispersion holding joints at moderately not ease. On one hand, the exploration is expected to set up a strategy. This technique is concocted to contemplate the physical wonders that have huge effect on dissemination holding, for example, time, temperature, weight on joints and metallurgical qualities. Elastic and shear tests are to be directed. This work is directed to acquire better understanding and portrayal of the dispersion holding of comparable and unique metals. It likewise intended to ge t ideal parameters for dissemination holding of aluminum covering over magnesium combination with aluminum composite. These two metals are jointed inside the kick the bucket in the wake of completing surface treatment. At that point the bite the dust is kept inside the dispersion holding machine by shifting the time, temperature, weight by methods for burden.

Thermoelectric Properties of Mg2Si1-x-yGexSbyPrepared by Spark Plasma Sintering

ABSTRACTThe magnesium compound Mg2Si and its solid solutions are expected asn-type thermoelectric (TE) material because they are non-toxic, have a large Clarke number, and are light weight. In this study, we improved TE performance by doping Ge into Sb-doped Mg2Si to cause phonon scattering and increase carrier concentration. A bulk of Sb-doped Si-Ge alloy as the raw material was fabricated using an arc-melting method. A high-purity Mg2Si was synthesized from metal Mg and Sb-doped Si-Ge alloy using spark plasma sintering equipment. For the samples with the same Sb concentration, the electrical conductivity was equivalent. On the other hand, the Seebeck coefficient was dependent on Ge concentration. Due to phonon scattering, thermal conductivity decreased by a small amount of Ge doping andκphdominated for thermal conduction. The minimum thermal conductivity of Mg2Si0.90Ge0.10was 2.25 W/mK (κph: 2.06 W/mK,κel: 0.19 W/mK). The dimensionless figure of merit (ZT) for the Mg2Si0.945Ge0.05Sb0.005sample was higher than that of the others due to reducing thermal conductivity and increasing carrier concentration. The maximumZTwas 0.47 at 713 K.

Evaluation of Iodine-Adsorption on Magnesium Compounds Toward Fixing of Radioactive Iodine

We studied an adsorption method as a technique of collection, and a vitrification method of iodine toward safekeeping. In this study, iodine-adsorptions on magnesium compounds were evaluated, and fixation of iodine into glass was tried. As a result, it was revealed that 1 g of magnesium oxide with high surface area successfully adsorbed 2.23 g of iodine. Iodine-adsorbed magnesium compound was tried to be vitrified with MgO-P2O5 glass.

Formability of Hybrid Aluminum-Magnesium Compounds

In the SFB 692 HALS (High-strength aluminum based lightweight materials for safety components), subproject B-3, the production of an aluminum magnesium compound by a hydrostatic co-extrusion process was investigated. The quality of these semi-finished products, especially the stability and robustness of the interface between the aluminum (AlMgSi1) sleeve and magnesium (AZ31) core, was of particular interest. Previous papers have described the first process optimization steps as the improvement of the die design as well as the numerical methods for identification of important process parameters and the development of a quality model for the interface. This paper describes the formability of such semi-finished products with subsequent forging processes, especially die forging. Therefore, two different die forging strategies were investigated. In the first approach the strand-shaped work piece, with a circular cross-section, was formed along its longitudinal axis with die forging. In the second approach the same geometry was radially formed with die forging. Thereby, the compound was formed in longitudinal direction up to an analytical equivalent strain value of 1.61 and in radial direction up to 1.38. First results showed that the interface of the aluminum magnesium compound is very stable and ductile enough to be forged. Dye penetration tests were performed to prove the stability of the interface in a first step. Then, micro sections were made to investigate the interface metallographically. No cracks or damages were detected with both test methods in the interface of the forged aluminum magnesium compound. Furthermore, numerical simulations were performed to analyze the forging processes in detail. Therefore, a full 3D simulation model was set-up with Forge2011 and the calibration was performed with the press force as well as the geometry aspects. The correlations between experiments and simulations are very well. By means of the calibrated simulation detailed analyses of interface section are performed and the stability of the interface was investigated. This shows that the compound quality reached by the hydrostatic co-extrusion process is very suitable for subsequent forming steps as die forging. The investigations show the potential of such hybrid compounds and clarify their application, especially in the automotive sector.