Different Levels Of Magnesium Research Articles

Effect of Alloying Elements Mg and Cu on the Modification of Eutectic Silicon in Hypoeutectic Al–Si Alloys

The modification of eutectic silicon plays a crucial role in enhancing the mechanical properties of hypoeutectic Al–Si alloys. However, there is still limited understanding regarding the factors that affect the modification of eutectic silicon in hypoeutectic Al–Si alloys, particularly in terms of the role played by alloying elements during the modification process. In order to address this gap, this study aimed to investigate the influence of two key alloying elements, Mg and Cu, on the modification effect of Sr. To achieve this, the morphology of eutectic silicon in the as-cast and heat-treated states of Al–7Si alloy, modified with Sr, was examined using scanning electron microscopy (SEM). Different levels of magnesium and copper content were used to analyze their impact on the modification effect of Sr. The results obtained from the analysis revealed that both Mg and Cu significantly weaken the modification effect of strontium on eutectic silicon. Furthermore, it was observed that the degree of deterioration in the modification effect increases progressively with higher alloying element content. Interestingly, increasing the strontium content and adjusting the cooling rate were found to be ineffective in eliminating this weakening effect caused by Mg and Cu. These findings highlight the complex interplay between alloying elements and the modification process of eutectic silicon in hypoeutectic Al–Si alloys. A deeper understanding of these factors is essential for the development of effective strategies to optimize the mechanical properties of such alloys.

Effect of Different Levels of Calcium & Magnesium on Production and Quality of Banana (Musa paradisiaca L.) cv. Grand Naine

The present experiment was conducted out during the 2022-2023 at the Horticulture Research Farm, Department of Horticulture, Sam Higginbottom University of Agriculture, Technology and Science Prayagraj. The banana tissue culture cv. Grand Naine G-9 (Cavendish Subgroup, AAA) was brought from government tissues culture, unit Lucknow. Tissue culture plants were left in shade nets condition for 2 weeks due to transportation and environmental stress. Light and frequent irrigation with watering can was done accordingly with respect to moisture levels in the soil. The field experiment was set up in RBD with 9 treatments and three replications. The different levels of Magnesium viz., (75g and 150g /plant) and Calcium viz., (150g and 300 g/plant).Based on the findings of the experiment, it is concluded that RDN + Calcium (150g /plant) showed the highest plant height (3.29 m), plant girth (72.14 cm), number of leaves/plant (27.11), number of sucker at harvest (9.13), leaf area (10.19 m2), length of inflorescence (122.62 cm), days taken to flowering (281.77), days to taken fruit harvest (83.12), bunch weight (27.28 kg), no. of hands/bunch (10.80), No. of finger per hand (17.33),total number finger of bunch (187.31), finger weight (136.33 g), finger length (22.87 cm), finger girth (15.20 cm), fruit yield per plant (25.52 kg), TSS (23.48 °Brix), Vitamin C (13.48 mg/100g), carbohydrates (25.44 g/100g), calcium (10.38 mg/100g) and magnesium (40.38 mg/100g).

The Combined Influence of Magnesium and Insulin on Central Metabolic Functions and Expression of Genes Involved in Magnesium Homeostasis of Cultured Bovine Adipocytes.

At the onset of lactation, dairy cows suffer from insulin resistance, insulin deficiency or both, similar to human diabetes, resulting in lipolysis, ketosis and fatty liver. This work explored the combined effects of different levels of magnesium (0.1, 0.3, 1 and 3 mM) and insulin (25, 250 and 25,000 pM) on metabolic pathways and the expression of magnesium-responsive genes in a bovine adipocyte model. Magnesium starvation (0.1 mM) and low insulin (25 pM) independently decreased or tended to decrease the accumulation of non-polar lipids and uptake of the glucose analog 6-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-6-deoxyglucose (6-NBDG). Activity of glycerol 3-phosphate dehydrogenase (GPDH) was highest at 25 pM insulin and 3 mM magnesium. Expression of SLC41A1 and SLC41A3 was reduced at 0.1 mM magnesium either across insulin concentrations (SLC41A1) or at 250 pM insulin (SLC41A3). MAGT1 expression was reduced at 3 mM magnesium. NIPA1 expression was reduced at 3 mM and 0.1 mM magnesium at 25 and 250 pM insulin, respectively. Expression of SLC41A2, CNNM2, TRPM6 and TRPM7 was not affected. We conclude that magnesium promotes lipogenesis in adipocytes and inversely regulates the transcription of genes that increase vs. decrease cytosolic magnesium concentration. The induction of GAPDH activity by surplus magnesium at low insulin concentration can counteract excessive lipomobilization.

Effects of transition from lamellar to compacted graphite on thermal conductivity of cast iron

Different levels of magnesium were added to a standard grey iron alloy in order to obtain a range of graphite morphologies from lamellar to compacted graphite. The thermal conductivity/diffusivity of samples, solidified at different cooling rates, was investigated by means of the laser flash technique. There is a significant decrease in the thermal conductivity as the morphology transits from lamellar to compacted graphite. The thermal conductivity of grey iron decreases considerably at elevated temperatures, whereas the thermal conductivity of compacted graphite iron is less sensitive to changes in temperature. At increased nodularities, compacted graphite irons exhibit a maximum thermal conductivity at ∼400°C. The influence from the cooling conditions on the thermal conductivity decreases as the morphology alters from lamellar graphite to compacted graphite. The effective thermal conductivity of cast iron is modelled by means of existing models for composites.

Calcium and magnesium in drinking water and risk of death from acute myocardial infarction in Taiwan

Many studies have examined the association between cardiovascular disease mortality and water hardness. However, the results have not been consistent. This report examines whether calcium and magnesium in drinking water are protective against acute myocardial infarction (AMI). All eligible AMI deaths (10,094 cases) of Taiwan residents from 1994 to 2003 were compared with deaths from other causes (10,094 controls), and the levels of calcium and magnesium in drinking water of these residents were determined. Data on calcium and magnesium levels in drinking water throughout Taiwan have been obtained from the Taiwan Water Supply Corporation. The control group consisted of people who died from other causes and the controls were pair matched to the cases by sex, year of birth, and year of death. The adjusted odd ratios (95% confidence interval) were 0.79 (0.73–0.86) for the group with water calcium levels between 25.1 and 42.4 mg/L and 0.71 (0.65–0.77) for the group with calcium levels of 42.6 mg/L or more. After adjustment for calcium levels in drinking water, there was no difference between the groups with different levels of magnesium. The results of the present study show that there is a significant protective effect of calcium intake from drinking water on the risk of death from AMI.

CALCIUM AND MAGNESIUM IN DRINKING WATER AND THE RISK OF DEATH FROM BREAST CANCER

The relationship between mortality from breast cancer and the levels of calcium and magnesium in drinking water was examined using an ecological design. The study area consisted of 252 municipalities in Taiwan. Data on the levels of calcium and magnesium in drinking water were collected from the Taiwan Water Supply Corporation (TWSC). The age-standardized mortality rate (ASR) for breast cancer (1982?1991) was compared among municipalities with different levels of magnesium and calcium in drinking water. Weighted multivariate regression analysis was used, and after adjusting for fertility rates and urbanization, there was a significant inverse relationship between the levels of calcium and magnesium in drinking water and risk of death from breast cancer.

Effects of an inadequate dietary intake of magnesium on osteogenesis in dairy cows during the dry period

The osteogenic activity in the rib bones of 33 dairy cows (14 of parity 1 or 2, and 19 of parity 3 or more) during their last two months of pregnancy, and the effects upon it of a deficient supply of dietary magnesium, were studied by means of intravenous infusions of the fluorochromes oxytetracycline hydrochloride, calcein and chlortetracycline given nine weeks, five weeks and one week, respectively, before the expected time of parturition. Seven weeks before this date the cows' ration was changed to one containing either 0.22 per cent magnesium (LMg) or 0.82 per cent magnesium (HMg) in the dry matter, and the potassium content of both rations was increased to approximately 4.1 per cent in the dry matter to reduce the absorption of magnesium. Four of the 10 LMg-high parity cows showed signs of periparturient hypocalcaemia. A significant decrease in the number of labelled osteons towards parturition was demonstrated in both the low parity (P less than 0.05) and high parity cows (P less than 0.001). The mean bone apposition rate in high parity cows was significantly lower (P less than 0.001) than in low parity cows. The different levels of magnesium in the diets of the cows had no significant effects on the numbers of osteons which were labelled nine weeks, five weeks or one week before parturition, or on the numbers of osteons which took more than one label or on the bone apposition rate. These results show that in these cows the rate of bone remodelling decreased as parturition approached.

Relationship between Magnesium and Zinc Levels of the Diet and Its Protein Utilization

Protein utilization of the diet was tested in relation to different levels of magnesium and zinc in rats. The experimental diets contained either a low (0.14 g Mg or 10 mg Zn/kg) or adequate (0.45 g Mg or 40 mg Zn/kg) level of Mg or Zn and two different quality protein sources: casein or wheat gluten. Net protein utilization and net protein radio indexes in case of casein were significantly lower for the diet containing a low level of Mg or Zn. For gluten diets, such differences were not observed. Digestibility of protein measured in rats fed a low Mg or Zn casein diet was the same as for the diets with an adequate content of these minerals. Rats fed low Mg or Zn casein diets showed a significantly lower plasma Mg or Zn and a lower liver DNA content in comparison to the rats on adequate Mg or Zn diets. The results indicate that the utilization of protein is affected by Mg and Zn content of the diet and that this relationship depends on the quality of protein.

Effect of dietary potassium on absorption of magnesium and other macroelements in sheep fed different levels of magnesium.

Two metabolism trials were conducted with 24 crossbred wether lambs. Two levels of Mg (.1 and .2%) and four levels of K (.6, 1.2, 2.4 and 4.8%) were fed in a 2 x 4 factorial arrangement of treatments. Each trial consisted of a 10-d preliminary period followed by a 10-d collection of feed, feces and urine. Increasing levels of dietary K resulted in a linear increase in fecal Mg excretion and a linear decrease in Mg absorption. A large depression in Mg absorption occurred when K was increased from 1.2 to 2.4% with a further decrease when K was increased to 4.8%. Lambs fed the high level of Mg (.2%) absorbed and retained more (P less than .05) total Mg (g/d, but not percentage of intake) compared with the low magnesium level (.1%). Dietary Mg did not affect the amount of K excreted, absorbed or retained. Increasing the level of dietary K resulted in a linear increase in urinary, fecal and total K excreted, absorbed and retained (P less than .05).

Grass tetany

The effect on the plasma levels of magnesium, calcium, and phosphorus of grazing pure Huia white clover and Ariki or Ruanui ryegrass pastures containing different levels of magnesium, calcium, and phosphorus was studied using 7 sets of identical twin cows and 30 yearling Romney wethers. Grazing either the white clover or the ryegrasses had no influence on the plasma levels of calcium and phosphorus. In cattle grazing Huia white clover, magnesium levels were significantly lower (P < 0.01) than those of animals grazing Ruanui ryegrass, even though the clover contained a higher level of magnesium. In contrast, sheep grazing Huia white clover had significantly higher (P < 0.05) plasma magnesium levels than sheep on Ariki ryegrass on the majority of occasions that the animals were sampled. A significant (P << 0.05) pasture species grazed x time of sampling interaction was observed for plasma magnesium levels in grazing sheep. The observed differences in plasma magnesium levels between the white clover...

Effects of dietary magnesium and glycyrrhizin on experimental atheromatosis of rats (long-term experiment).

Purified diets containing cholesterol, cholic acid and different levels of magnesium with or without glycyrrhizin and Mg-K-Aspartate were fed to young growing rats for 138 days. The mild diet-induced magnesium deficiency resulted in poor growth, hypomagnesemia, an increased production of atheromatosis of aorta and heart valves, a profound calcification of kidney, an increase of calcium concentration of kidney, a slight decrease of magnesium concentration in kidney and myocardium, increases of cholesterol, glycerol and phosphorus in lipid fraction of serum, and an increase of weight of the liver and spleen. Rats receiving a dietary glycyrrhizin showed an increase of magnesium concentration of myocardium, decrease of magnesium in serum, a decrease of cholesterol in serum, increase of glycerol and phosphorus in lipid fraction from liver and decrease of glycerol and phosphorus in lipid fraction from serum.Rats fed a diet containing 24mg. of magnesium per 100Gm. of diet without cholesterol and cholic acid, showed a conspicuous calcification of kidney, suggesting that 24mg. of magnesium per 100Gm. of diet is insufficient. Rats receiving a dietary magnesium in a form of Aspartate instead of MgO, had a decreased concentration of glycerol and phosphorus of lipid fraction in serum, and an increase of magnesium in myocardium.