• Title, Summary, Keyword: Magnesium

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

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

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

  • 이병건;최진섭
    • 공업화학
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    • v.22 no.5
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    • pp.514-517
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    • 2011
  • 본 실험에서는 옥살산과 알코올계 용매를 사용하여 마그네슘 호일의 화학적 식각에 의해서 마그네슘 옥살레이트(Magnesium oxalate) 나노구조를 제조하였다. 알코올계 용매 중 에탄올 용매에서 마그네슘 옥살레이트 나노와이어를 얻을 수 있었다. 시간에 따른 나노와이어의 형성 과정을 살펴보았고, FE-SEM을 통하여 형상을 살펴보았다. TGA 분석을 통하여 열처리 조건을 결정하였다. 열처리를 통하여 마그네슘 옥살레이트 나노와이어에서 산화마그네슘(MgO) 나노와이어로 전환시켰고, 이를 FE-SEM과 FT-IR을 통하여 확인하였다.

마그네슘 주조성형기술의 개발동향 (Development Trend of Magnesium Casting Technology)

  • 김현식;예대희;강민철
    • 한국주조공학회지
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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.

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

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

  • 이상조;이승호;신현진;조현종;김복진;정종배
    • 한국토양비료학회지
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    • v.36 no.4
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    • pp.218-224
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    • 2003
  • 최근 고토비료로 등록된 수산화고토는 황산고토와 비교할 때 용해도가 매우 낮으며 토양반응에 미치는 영향 측면에서도 다른 특성을 가지고 있다. 본 연구에서는 이들 두 가지 고토비료를 표준시비량인 $300kg\;MgO\;ha^{-1}$ 수준으로 처리한 경산통 토양에서 배추 재배하여 그 비효를 비교하였다. 수산화고토는 배추의 엽수와 생체중을 증가시키는 효과를 보였으나, 생육 전반에 미치는 효과에 있어서는 황산고토와 비교할 때 통계적으로 유의성 있는 차이를 보이지는 않았다 ($p{\leq}0.05$). 배추의 마그네슘 함량은 생육초기에는 황산고토 처리구에서 높았으나 수확기에 조사된 결과에서는 수산화고토 처리구에서 높았으며, Ca, P, 및 K 함량은 황산고토에 비하여 수산화고토 처리구에서 높았다. 그러나 비종간의 이들 양분 흡수의 차이는 통계적으로 유의하지 못하였다. 황산고토를 처리한 토양의 pH는 대조구에 비하여 낮아졌으나, 수산화고토 처리구에서는 pH가 높아졌고 유효인산 함량 또한 증가하였다. 침출성 Ca 함량은 수산화고토 처리구에 비하여 황산고토 처리구에서 낮게 나타났다. 토양반응과 양분의 유효도에 미치는 영향의 차이는 비종간의 화학적 특성 차이에 기인하는 것으로 판단된다. 따라서 동일한 수준으로 시용할 때, 수산화고토와 황산고토의 작물에 대한 비효는 대등한 것으로 결론지을 수 있으며, 산성토양이나 용탈이 쉽게 일어날 수 있는 사질 토양에서는 산성비료이며 수용성인 황산고토보다 수산화고토의 시용이 유리할 것으로 판단된다.

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

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

  • 신현우;유형조;여동훈;신경열;고윤석;최상운;이성원
    • 한국소성가공학회:학술대회논문집
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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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마그네슘 합금 스크랩의 진공증류에 관한 연구 (Study on the Distillation of Magnesium Alloy Scrap)

  • 위창현;유정민;장병록;유병돈
    • 대한금속재료학회지
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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.

적외선 열화상법 및 FE-SEM을 활용한 마그네슘 연소특성에 관한 실험적 연구 (Experimental Study on the Combustion Characteristics of Magnesium using Infrared Thermography and FE-SEM)

  • 이준식;남기훈
    • 한국산업융합학회 논문집
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    • v.23 no.6_2
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    • pp.927-934
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    • 2020
  • Magnesium powder has been widely used in various industries because it is light weight and extremely high mechanical strength including aeronautics and chemicals. However, magnesium, as a combustible metal, poses serious safety issues such as fires and explosions if it is not managed properly. Especially, magnesium's max adiabatic flame temperature is 3,340℃ and it is impossible to extinguish it by using water, CO2 and Halonagents. The aim of this study is to identify the combustion characteristics of magnesium powder. We carried out a combustion experiment, using 1 kg of magnesium (purity > 99 %, particle < 150 ㎛). The features of the magnesium burning process were scrutinized using infrared thermal image analysis. Also, a field-emission scanning electron microscope (FE-SEM) were used employed to analyze particulate composites and properties. It concludes the significant tendency of magnesium fire and light, combustion carbide's particle characteristics. This study contributes to make better prevention and response manners to magnesium fires, as well as fire investigation measures.