• Title, Summary, Keyword: Magnesium

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Effects of Magnesium Supplement Levels and Periods on Lipid Metabolism and Enzyme Activities in Rats (저단백식이와 마그네슘 결핍식이 섭취시 마그네슘 보충이 흰쥐의 지질대사 및 효소 활성에 미치는 영향)

  • 정복미
    • Journal of Nutrition and Health
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    • v.26 no.8
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    • pp.933-941
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    • 1993
  • The present study was carried out to investigate the effects of magnesium supplement levels and periods on lipid metabolism in male Sprague-Dawley rats given low protein and magnesium deficient diets. The effect of magnesium supplement levels and periods on lipid metabolism in rats given a low protein and magnesium deficient diet for 2 weeks were investigated. Serum total lipid and triglyceride contents were significantly lower in magnesium supplement group compared with magnesium deficient group. Serum HDL-cholesterol/total cholesterol ratio was significantly increased as magnesium supplement level was increased. Liver total lipid, triglyceride, total cholesterol and phospholipid contents were significantly lower in magnesium supplement group than those in magnesium deficient group. Serum ALP, GOT and GPT activities were significantly decreased in magnesium supplement group compared with magnesium deficient group. In summary, the effect of magnesium supplement on lipid metabolism and enzyme activities were significant and we can see that magnesium supplement level propered to be requirement level(400 mg/kg diet)in the other cases except serum lipid contents.

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Effects of Magnesium Supplement on Calcium, Magnesium, and Phosphorus Metabolism in Rats Fed Protein and Mg Deficient Diets (저단백식이와 마그네슘 결핍식이 섭취시 마그네슘 보충이 흰쥐의 칼슘, 마그네슘 및 인 대사에 미치는 영향)

  • 정복미
    • Journal of Nutrition and Health
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    • v.31 no.6
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    • pp.1031-1038
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    • 1998
  • The present study was carried out to investigate the effects of magnesium supplement levels and periods on calcium, magnesium, and phosphorus metabolism in male Sprague-Dawley rats given low protein and magnesium deficient diets for 2 weeks. Serum calcium content was significantly lower in the magnesium supplement group than in the magnesium-deficient group, but calcium excretion in urine and feces was significantly increased as magnesium level and period was increased. Increasing the dietary magnesium level and periods raised serum content and excretion of magnesium in urine k feces. Urinary excretion of phosphorus in two week group was significantly lower in the magnesium supplement group than in the magnesium-deficient group. fecal phosphorus excretion in supplement group (Mg 800mg/kg diet) was significantly higher than that of other group. (Korean J Nutrition 31(6) : 1031-1038, 1998)

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Preparation of Magnesium Oxide Nanowires from a Magnesium Foil (마그네슘 금속으로부터의 산화마그네슘 나노와이어 제조)

  • Lee, Byung Gun;Choi, Jinsub
    • Applied Chemistry for Engineering
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    • v.22 no.5
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    • pp.514-517
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    • 2011
  • Herein, we fabricated magnesium oxalate nanostructures by chemical etching of a magnesium foil in alcoholic solvents containing acidic media. Interestingly, we could obtain magnesium oxalate nanowires in ethanolic oxalic acid. Growth mechanism for magnesium oxalate nanowires was investigated in terms of etching time. Annealing conditions were determined from TGA results. Magnesium oxalate nanowires were converted to magnesium oxide nanowires by thermal treatment and the magnesium oxide nanowires were examined by FE-SEM and FT-IR measurement.

Development Trend of Magnesium Casting Technology (마그네슘 주조성형기술의 개발동향)

  • Kim, Hyun-Sik;Ye, Dea-Hee;Kang, Min-Cheol
    • Journal of Korea Foundry Society
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    • v.31 no.5
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    • pp.243-248
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    • 2011
  • Magnesium alloys have many advantages such as light-weight, high machinability, damping capacity, etc. So magnesium alloy parts have been used in transportation, mobile phone, military industries. Because of HCP atomic structure, Magnesium is very difficult in plastic deformation process, so most of magnesium products are fabricated by casting process. Magnesium alloys have low heat-capacity, high fluidity and low Fe solubility. For these reasons it is more suitable than aluminum in mass-production by casting. And various casting technologies have been developed. So casting technologies for magnesium developed recently is discussed in this paper.

The Effects of Dietary Magnesium on Systolic Blood Pressure and Electrolyte Distribution in Normotensive and Spontaneously Hypertensive Rat (정상 혈압쥐와 본태성 고혈압쥐에 있어 식이상의 마그네슘 섭취가 수축기 혈압과 전해질 배분에 미치는 영향)

  • 배현수
    • Journal of Nutrition and Health
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    • v.22 no.2
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    • pp.91-101
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    • 1989
  • This study was performed to investigate the effects of different dietary magnesium levels on systolic blood pressure and mineral distribution in normotensive and spontaneously hypertensive rats. In experiment 1, Normotensive rats(NTR ; Sprague Dawley, Female) were given diets containing regular magnesium (0.05% Mg ; rMg), marginal magnesium (0.01% Mg ; mMg) or marginal magnesium with stress(0.01% Mg + stress ; mMg + Str). In experiment 2, spontaneously hypertensive rats (SHR ; Kyoto Wistar, Femal) were fed diets containing regular magnesium(0.05% Mg ; rMg) and high magnesium (0.2% Mg ; hMG). The following were found ; 1) NTR treated with marginal magnesium with stress showed significant increase in systolic blood pressure (SBP). Marginal magnesium diet without stress resulted in nonsignificant increase in SBP. Significant in crease of blood pressure showed in NTR treated with marginal magnesium and stress was associated with decreased magnesium and increased calcium content in femur, reticulocyte and plasma. 2) In experiment 2, magnesium supplementation to SHR showed significant attenuation of their systolic blood pressure with increasing age. The attenuation of SBP showed in SHR was associated with increased magnesium, lowered calcium content in cardiac muscle and reticulocyte and decreased plasma sodium and aldosterone level.

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Effect of Mg-Sulfate and Mg-Hydroxide on Growth of Chinese Cabbage (배추에 대한 황산고토와 수산화고토의 비효 비교)

  • Lee, Sang-Jo;Lee, Sung-Ho;Shin, Hyun-Jin;Cho, Hyun-Jong;Kim, Bok-Jin;Chung, Jong-Bae
    • Korean Journal of Soil Science and Fertilizer
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    • v.36 no.4
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    • pp.218-224
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    • 2003
  • Magnesium hydroxide, which recently registered as a Mg fertilizer, is greatly different from magnesium sulfate in its solubility and effect on soil pH. In this study, the effects of magnesium hydroxide and magnesium sulfate on growth of chinese cabbage were compared at the application rate of $300kg\;MgO\;ha^{-1}$ in a Gyeongsan clay loam soil. Although magnesium hydroxide was effective in increasing number of leaf and fresh weight, overall effects of magnesium hydroxide and magnesium sulfate on the growth of chinese cabbage were not significantly different ($p{\leq}0.05$). Comparing the two magnesium fertilizer treatments, magnesium content of chinese cabbage was relatively higher in the magnesium sulfate treatment in the early stage of growth, but it was higher in the magnesium hydroxide treatment at harvest. Contents of Ca, P, and K in chinese cabbage were relatively higher in the magnesium hydroxide treatment than those in magnesium sulfate treatment. But, the differences in nutrient uptakes by chinese cabbage between the treatments were not significant ($p{\leq}0.05$). Therefore, magnesium hydroxide is expected to be used with nearly the same effects on crops as magnesium sulfate at the same application rate of Mg. Soil pH in the treatment of magnesium sulfate was lower than that of control treatment, but magnesium hydroxide could increase pH. Magnesium hydroxide can be used preferentially in acid and/or sandy soils, where magnesium sulfate can induce further soil acidification and leaching loss of Mg is often a severe problem.

Effect of Dietary Protein and Magnesium Levels on Serum Lipid Contents and Enzyme Activities in Rats (단백질과 마그네슘 공급수준이 흰쥐의 혈청중 지질함량 및 효소활성에 미치는 영향)

  • 정복미
    • Journal of Nutrition and Health
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    • v.26 no.8
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    • pp.925-932
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    • 1993
  • To study the effects of dietary protein and magnesium level on serum lipid contents and enzyme activities, male Sprague-Dawley rats were divided into six groups. Six groups of animals were fed six experimental diets different with protein(8% and 20%) and magnesium levels (Mg-free, 400mg/kg diet and 800mg/kg diet). The serum lipid contents and enzyme activities of rats fed different dietary protein and magnesium levels were examined. Serum triglyceride contents was significantly decreased as the dietary magnesium level was increased. Serum phospholipid contents was significantly higher in magnesium deficient group than those in the other groups. Serum alkaline phosphatase activity was significantly decreased in magnesium dificient group compared with other groups, but serum glutamic oxaloacetic transaminase and glutamic pyruvic transaminase activities was significantly increased in magnesium dificient group than other groups. In conclusion, serum triglyceride contents in low protein level was remarkably decreased as the dietary magnesium level was increased.

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Study on the Distillation of Magnesium Alloy Scrap (마그네슘 합금 스크랩의 진공증류에 관한 연구)

  • Wi, Chang-Hyun;Yoo, Jung-Min;Jang, Byoung-Lok;You, Byoung-Don
    • Korean Journal of Metals and Materials
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    • v.46 no.1
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    • pp.13-19
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    • 2008
  • To develop a recycling process of magnesium alloy scrap, a fundamental study on the distillation of magnesium alloy melt was carried out. Melt temperature, vacuum degree and reaction time were considered as experimental variables. The amount of vaporized magnesium melt per unit surface area of melt increases with the increase of melt temperature, reaction time and vacuum degree. The vapor condensed at the tip of water cooling Cu-condenser as a form of pine cone. Magnesium and zinc were vaporized easily from the melt. However, It's difficult to separate magnesium and zinc by vacuum distillation because vapor pressure of zinc is similar to one of magnesium. The contents of aluminum, manganese and iron, etc. in residual melt increase due to the decrease of magnesium and zinc content after the distillation of magnesium alloy.

Design and Analysis of vehicle Hood using Magnesium Alloy Sheets (마그네슘 합금 판재를 이용한 차량용 후드의 설계 및 해석)

  • Shin H. W.;Yoo H. J.;Yeo D. H.;Shin K. Y.;Koh Y. S.;Choi S. W.;Lee S. W.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.220-226
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    • 2005
  • To achieve the weight reduction of a vehicle, Magnesium alloys are widely used in automobile parts because of its lightweight characteristics. Magnesium alloys also have advantages in recycling, stiffness, NVH , heat protection. But Magnesium alloy parts are mainly manufactured by diecasting processes, their productivity was not so high compared to by sheet metal working. We are developing vehicle hood using magnesium sheets. In this study we designed magnesium alloy hood which have equivalent mechanical characteristics to steel hood. Using finite element method we decided thickness of magnesium sheets under some design requirements and we changed the shape of hood inner panel and hinge reinforcements. Outer and inner panel thickness was 1.3mm, 1.5mm respectively. Panel dentibility analysis was performed to conform the new magnesium design by nonlinear FEM package. Formability and hemming of Magnesium sheets are the subjects for further study because they have poor stretchability compared to steel sheets.

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A Study of forming limit on rotational incremental forming of magnesium alloy sheet (회전 인크리멘탈 성형을 이용한 마그네슘 합금 판재의 성형한계 연구)

  • Park, J.K.;Bae, M.K.;You, B.S.;Kim, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.456-461
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    • 2008
  • Being a lightweight material, magnesium is increasingly employed in automotive parts. However, because of its hexagonal closed-packed (HCP) crystal structure, in which only the basal plane can move, the magnesium alloy sheets show low ductility and formability at room temperature. Thus the press forming of magnesium alloy sheets has been performed at elevated temperature within range of $200^{\circ}C{\sim}250^{\circ}C$. However, we confirmed that using rotational incremental forming magnesium alloy sheets were formed without any heating at previous study. In this study, at the forming of square cup using rotational incremental sheet forming, the strain distributions were obtained and it was compared with forming limit curve at neck (FLCN). Also, forming limit curves at fracture (FLCF) of magnesium alloy sheets were obtained at elevated temperature and it was compared with the strain distribution of square cup of magnesium alloy sheet. In this study, we confirmed that conventional forming limit curves can not predict rotational incremental forming.

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