جستجوی مقالات مرتبط با کلیدواژه « وانادیوم » در نشریات گروه « علوم پایه »

A supramolecular compound of vanadium (V) with [(CH3)2NH2]4[V16O42](SO4).2(O)[+solvent] formula (1) was crystallized in the tetragonal crystal system, space group P42/nnm with Z=2. The final R value of compound 1 is 0.048 for 2214 independent reflections. The asymmetric unit of 1 consists of a half of the dimethylammonium cation, a quarter of sulfate anion, a part of vanadium cluster, and water molecules. In the supramolecular structure of compound 1, each dimethyl ammonium cation is bridged between two polyoxovanadate clusters through hydrogen bonds and sulfate anions play a key role as the tetragonal supramolecular structure extends along these anions.

Loss of muscle mass is one of the side effects of diabetes that may be delayed by regulating blood sugar levels through exercise or herbal supplements. Thirty-five male rats (180±10 g) were assigned to seven groups of control, diabetic, diabetic + exercise, diabetic + vanadium, diabetic + exercise + vanadium, diabetic + stevia, and diabetic + exercise + stevia. To induce type 1 diabetes, streptozotocin (55 mg/kg) was injected intraperitoneally, and vanadium extract (1mg/ml) was daily dissolved in water. The endurance training program consisted of eight weeks of treadmill running, five days a week, starting at 15 minutes at 20 meters/minute and ending at 35 minutes at 30 meters/minute in the final week. Histopathological changes in brain tissue were examined using a light microscope. In order to normalize the parametric data, Kolmogorov-Smirnov test and for their analysis, one-way ANOVA with Bonferroni post hoc test, and for non-parametric data, Kruskal-Wallis test (p ≤ 0.05) were used. Body weight values ​​in all six experimental groups significantly decreased compared to healthy control group (p=0.001), in vanadium group compared to vanadium + exercise (p = 0.01), and in stevia + exercise group compared to stevia (p = 0.04). In the diabetic group, slight changes in cell number and size improved with exercise along with vanadium and stevia, and consumption of stevia, as well as cell degeneration with exercise along with vanadium and stevia, and consumption of vanadium and stevia (p=0.001). Eight weeks of endurance exercise, stevia, and vanadium intake appear to be effective in regulating body weight as well as improving the hamstring muscle damage caused by diabetes.
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For the first time, a novel and efficient Magnetic Multi-Wall Carbon NanoTube (MMWCNT) was introduced as a novel sorbent for Solid-Phase Extraction (SPE) coupled with ElectroThermal Atomic Absorption Spectrometry (ET-AAS) for sensitive determination of vanadium (V) in environmental water samples. Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Energy-Dispersive X-ray analysis (EDX), Vibrating Sample Magnetometry (VSM), and Fourier Transform-InfraRed (FT-IR) spectroscopy were applied to characterize the prepared nanoparticles. A unique and attractive property of this method is that magnetic adsorbents can be simply isolated from sample solutions by an external magnetic field without using a centrifuge. N-Benzoyl-N-phenylhydroxylamine (BPHA) was used as a complexing agent for extraction of the analyte into the solid phase. The extracted complex was injected into the instrument for analysis. Initially, effective parameters controlling the performance of the extraction process were evaluated and optimized. Under the optimized condition, the calibration curve showed linearity in the range of 25-2000 ng mL-1 with a regression coefficient corresponding to 0.997. Limits of detection (LOD, S/N = 3) and relative standard deviations were 8 ng mL-1 and 3.9 % (n = 6) respectively. The proposed method was successfully applied for the preconcentration and trace determination of V in environmental water samples while the accuracy was approved by analyzing relative recovery experiments as well as a standards reference material.

Vanadium is a metal which is used in ferrous and nonferrous alloys due to its physical properties such as tensile strength and hardness. In this study, the combined salt roasting and acid leaching processes was used for the extraction of vanadium from the Saghand iron ore. Firstly, the ore and sodium carbonate were mixed and placed in a high temperature furnace during the roasting process, and then the leaching operation was carried out by sulfuric acid. Factors affecting the processes such as temperature and time of roasting procces, acid concentration, leaching temperature, time and liquid to solid ratio were studied and their optimum values were obtained. According to the results, under roasting salt with 50 wt.%, temperature of 1000 °C, and a time of 1 h and for conditions of acid leaching with a concentration of 15%(v/v) sulfuric acid, temperature of 90 °C, the time of 4 h, and the ratio of liquid to solid of 15 mL/g, leaching efficiency of vanadium was approximately 80%.

This study was carried out to determinate the acceptable intake without harmful effects due to vanadium in muscle tissue of Strongylura strongylura (Chingo) as the most consumed fish from Bahragan of Persian Gulf and to compare it with global health standards and it`s effects on human. In this research, in winter 1389, 18 samples of Chingo fish in 3 longitudinal group (small, medium and large) from Bahragan area, fishing platform Bahragansar was randomly hunted. Prior measuring of vanadium concentrations in muscle tissue by Atomic absorbtion (Model: 220z, varian-Austrailia) was measured. According to results, the mean concentration of Vanadium in muscle tissue was 2.5091± 1.14201 µg/g w.d. According to the World Health Organization (WHO) intake of Strongylura strongylura (carnivorous species) due to high accumulation of Vanadium, it`s consume is highly limited specially in long length groups. Considering permissible limit of Vanadium determined by World Health Organization (WHO), for an adult person weighted 60 kg, the maximum permissible consumption limit of Strongylura strongylura in big longitudinal group is tantamount to 6.354g.

Environmental contamination of biorecomedatoin, based using microorganisms have found spread usage today. According to diversity’s metabolic microorganism and ability of their utilize from environmental contaminant as food. Microorganism also can contamination as food and convert them to material with high permanent and low toxin. If we have appropriate selection about them, we can analysis, absorption and delete various contamination by the microorganisms. We take sample from water and sediment from 7 stations on intertidal zone in Coast of Khark Island for obtains bacteria that live in sea and decrease heavy metal such as nickel and vanadium. Collected specimen cultured in environment culture of Nutrient Agar salted and environment culture of rich sea water. We evaluate by two quantity and quality with inoculated with the liquid environment BHI Broth for measurement resistance and uptake of heavy metals nickel and vanadium. We evaluate growth rate bacteria in 300 ppm of nickel and 250 ppm vanadium by Spectrophotometer UV device and absorption atomic device evaluate measurement rate of uptake vanadium and nickel by bacteria. Then, using biochemical tests both Bacillus sp. PGS4 and Bacillus sp. PGS10 were identified that were resistant. Bacillus sp. PGS4 and Bacillus sp. PGS10 had % 80.61 and %77.99 absorption of nickel 300 ppm respectively. These organisms had%70.80 and %67.58 absorption of vanadium 250 ppm.