• 한국세라믹학회지
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• 제44권9호
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• pp.483-488
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• 2007

The influence of $P_2O_5$ on clinker mineral composition and the cement quality was investigated. When the sewage sludge was used as a raw material in place of clay, the presence of $P_2O_5$ in sewage sludge affects the mineral composition and the clinker quality. As the $P_2O_5$ concentration in raw mix increases, the burnability of clinker becomes worse and the alite decomposes into belite and free-CaO, so belite increases with the decrease of alite. The early strength of mortar decreases with the increase of $P_2O_5$ concentration. On the other hand, later-age strength increases with the increase of belite content. The setting time of cement was delayed with the $P_2O_5$ concentration above 0.6 wt%.

• 자원환경지질
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• 제53권6호
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• pp.743-753
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• 2020

본 연구는 폐석탄광산인 옥동탄광 하류에 위치한 밭토양과 논토양을 대상으로 중금속함량, 광물조성, 분광특성을 고찰하였다. X선 형광분석 결과 밭토양과 논토양 모두 비소가 토양환경오염 우려기준을 초과하여 검출되었으며 밭토양이 논토양보다 중금속오염지수가 상대적으로 높은 것을 확인하였다. X선 회절분석 결과 밭토양과 논토양 모두에서 석영, 방해석, 고령토, 일라이트, 스멕타이트, 자철석 그리고 적철석 광물이 검출되었다. 또한 유기물 분석을 실시한 결과 밭토양의 유기물 함량 변이가 더 큰 것으로 나타났다. 분광분석 결과 밭토양과 논토양의 전체적인 반사도 곡선의 양상과 흡광특성은 유사하게 발현됨을 확인하였다. 490nm 부근과 900nm 부근에서 토양 내 산화철에 의해, 1410nm, 1910nm 부근과 2200nm 부근에서 점토광물인 고령토와 스멕타이트군에 의한 흡광특성이 두드러지게 나타났으며 유기물의 함량이 많을수록 반사도가 감소하였다. 흡광 깊이는 밭토양과 논토양 모두 흡광특성이 발현되는 곳에서 오염 지수가 높아짐에 따라 흡광깊이는 얕아졌으며, 유기물 함량이 증가함에 따라 490nm 부근과 1916nm 부근의 흡광깊이가 얕아지는 경향을 보였다.

• Asian-Australasian Journal of Animal Sciences
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• 제12권3호
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• pp.422-428
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• 1999

The mineral status of native goats and forage species, namely; Cynodon plectostachyus, Pennisetum purpureum. Eleusine indica, Cynodon dactylon, Calopogonium muconoides, Centrosema pubescens, Leucaena leococephala, and Mimosa pudica in lahar affected areas of Concepcion, Tarlac, Philippines were determined. Forage and blood samples were collected six times in 1996-97, and analyzed for calcium, phosphorus, magnesium, sulfur, copper, iron, molybdenum, selenium, and zinc. Forage calcium and sulfur are non-limiting. Most species had low phosphorus, copper and selenium, while some had magnesium and zinc levels lower than the critical limit because of low mineral content and high percolation rate of lahar deposits. Iron and molybdenum were in excess. The effect of seasonal variation was observed only in copper, sulfur and iron. Average blood mineral concentration of the animals was above critical limit, but there were no significant differences between seasons. All the animals had plasma phosphorus and magnesium above critical level; but 20 % had low copper, zinc and selenium especially in dry season possibly due to insufficient amount of these elements and excessive molybdenum and iron in most forage. Conversely, calcium in forage was high; but 40 % of the animals had low plasma calcium concentration. Although no clinical signs of mineral deficiencies were observed, supplemental feeding would be important since the condition of the pasture in lahar-laden areas is not expected to improve in the next five years. Intensified use of L. leucocephala with better mineral profile would be ideal.

• 문화기술의 융합
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• 제8권6호
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• pp.155-159
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• 2022

모발의 필수 미네랄 원소 농도 데이터로 인공지능을 학습시킨 후, 피험자의 모발 미네랄 원소 농도로 나이를 예측하도록 하고 그 결과를 피험자의 실제 나이와 비교하여 연관성을 조사하였다. 전체 모발 데이터는 296개이었으며그 중 2/3를 인공지능 학습에 그리고 1/3을 피험자 데이터로 사용하였다. 25세 이하의 성장기 피험자의 실제 나이와 인공지능이 예측한 나이 사이에는 0.678 의 중상 정도의 상관관계가 있었다. 중년의 피험자 그룹에서는 연관성이 거의 없었고 노년의 피험자 그룹에서는 0.522의 약한 상관관계를 보였다. 모발의 미네랄 원소 농도 데이터를 이용한 인공지능의 유용성을 확보하기 위해서는 더 많은 수의 데이터를 제공하여 인공지능을 학습시키는 과정이 필요하다.

• Journal of Animal Science and Technology
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• 제45권6호
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• pp.1031-1038
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• 2003

본 연구는 축사 내에서 집약적으로 사육되고 있는 꽃사슴의 녹용 성장기간 중의 혈액성분변화와 녹용성장과의 관련성 해석을 위한 기초자료를 제공하고자 수행하였다. 녹용성장기간 중 혈액성분의 변화를 측정하기 위하여 우리 내에서 사육 중인 4${\sim}$6년 생 꽃사슴 웅록 25두를 무작위로 선별하여, 낙각 직후부터 10일 간격으로 절각일(50일)까지 혈액을 채취하여 미네랄과 효소 활성치를 측정하였다. 칼슘과 인의 농도는 녹용성장기간 중 커다란 변동이 없었으며 나트륨, 칼륨, 염소의 농도는 낙각 직후와 녹용성장에 따른 경시적인 유의차가 나타났다. AST, ALT, amylase, CK, GGT 및 LDH의 농도는 낙각 직후와 녹용성장에 따른 유의차는 인정되지 않았으나, ALK-P의 농도는 녹용성장이 진행되면서 계속 증가하여 낙각 후 50일 경에는 최고치를 나타내어 낙각시의 농도와 유의차가 나타났으며(p〈0.01), CK와 LDH의 활성은 다른 동물들보다 높게 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제15권4호
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• pp.531-536
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• 2002

We investigated the exercise-induced changes in the serum concentration of several minerals in horses. Four welltrained Thoroughbred horses performed exercise for 5 d. The blood hemoglobin (Hb) concentration increased during exercise, recovered to the pre-exercise level immediately after cooling down and did not change again up till the end of experiment. The changes in serum zinc (Zn) and copper (Cu) concentrations were similar to those of blood Hb during the experiment. The serum magnesium (Mg), inorganic phosphorus (Pi) and iron (Fe) concentrations also increased during exercise. Though the serum Pi concentration recovered to the pre-exercise level immediately after the cooling down, it decreased further before the end of the experiment. The serum Mg concentration was lower immediately after cooling down than its pre-exercise level but gradually recovered from the temporal reduction. The recovery of the serum Fe concentration was delayed compared to that of other minerals and recovered 2 h after cooling down. The serum calcium (Ca) concentration did not change during exercise but rapidly decreased after cooling down. As a result, it was lower immediately after cooling down than its pre-exercise level. It recovered, however, to the pre-exercise level 2 h after cooling down. The temporal increase in the serum concentrations of all minerals except Ca is considered to result from hemoconcentration induced by exercise and the stable concentration of the serum Ca during exercise is possibly due to its strict regulation of homeostasis. These results indicate that the serum concentration of each mineral responds differently to exercise in horses, which may be due to the difference in metabolism among these minerals.

• 한국광물학회지
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• 제31권2호
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• pp.75-86
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• 2018

본 연구는 강원도 도계광업소 수계에 발생한 적갈색침전물을 대상으로 침전환경을 파악하고, 중금속함량, 광물조성 및 그에 따른 분광학적 특성을 분석하였다. 적갈색침전물의 pH 범위는 7.59-7.94로 침전환경은 중성에 해당한다. X선형광분석 결과 철이 평균농도보다 높게 검출되었으며, 니켈, 구리 및 아연의 오염도가 높은 것으로 판명된다. X선회절분석 결과 돌로마이트, 방해석, 침철석, 자철석, 고령토, 엽납석, 석영 및 알루미늄 이소프로폭사이드의 광물이 확인되었다. 중금속 오염에 따른 분광학적 특성을 분석한 결과, 중금속함량이 증가함에 따라 가시광선 영역에서는 반사도가 증가하는 추세를, 적외선 영역에서는 반사도가 감소하는 추세를 보인다. 적갈색침전물의 분광특성은 침철석, 자철석, 고령토, 엽납석 및 알루미늄 이소프로폭사이드에 의해 발현되는 것으로 판단된다.

• Asian-Australasian Journal of Animal Sciences
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• 제10권1호
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• pp.28-34
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• 1997

This study was conducted to determine the protein content, cell wall fractions, and mineral concentrations of some minor plant species collected for one year in pastures grazed by goats in the Philippines. An assessment of nutrient variability and a comparison of forage protein and mineral concentrations to the critical value of protein and minerals based on animal needs were also studied. The plant species were the following: grasses(Axonopus compressus, Eleusine indica, Rottboellia exaltata); legumes (Aeschynomene indica, Calopogonium muconoides, Desmodium tortousum); and herbs (Corchorus olitorius, Ipomea aquatica, Sida acuta, Synedrella nodiflora). The two seasons (dry and wet) were subdivided into Dry-1 (December to February, 132 mm total rainfall), Dry-2 (March to May, 25 mm total rainfall), Wet-1 (June to August, 1,138 mm total rainfall), and Wet-2 (September to November, 1,118 mm total rainfall). Results showed that significant differences were obtained on various nutrient fractions including those mineral concentrations across species. Across season, acid detergent lignin (ADL) had higher (p < 0.05) value at Dry-1. Legumes and herbs were higher in crude protein (CP) especially Sida acuta. Grasses showed the highest neutral detergent fiber (NDF) and acid detergent fiber (ADF) with the addition of Sida nodiflora (herb) for it contained high NDF. Aeschynomene indica contained the highest amount of ADL and the herbs (Ipomea aquatica and Sida acuta) had exceptionally high concentration of minerals. Coefficient variation of the various nutrient values ranged from 27.3 to 136.7%. Some forage minerals appeared to be deficient (sodium, phosphorus and copper) or excess (molybdenum) for the whole or part of the year. This study shows that some minor plant species could extend the range of concentration of some nutrients (i.e., CP and minerals) beyond that normally found in conventional pasture species.

• 한국미생물·생명공학회지
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• 제17권3호
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• pp.247-251
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• 1989

여러가지 염이 sisomicin 발효에 미치는 영향에 대해 살펴본 결과, CoCl$_2$만이 항생물질 생성의 대사반응에 cofactor로서 작용하였으며 16.8 $\mu$M에서 최대항생물질의 수율이 얻어졌다. 한편, 앞의 경우보다 훨씬 높은 염농도에서 ZnSO$_4$, KH$_2$PO$_4$, FeSO$_4$그리고 MgSO$_4$가 각각 발효배지에 첨가되었다. ZnSO$_4$와 KH$_2$PO$_4$는 전혀 효과가 없었으나 FeSO$_4$는 약간 항생물질 수율의 향상을 가져왔다. 그러나 MgSO$_4$의 경우, 매우 높은 염농도에서도 균체생육의 저해가 약간 일어났으며, 최종 항생물질의 수율은 100% 이상 증가되었다. 이러한 결과는 부분적으로 발효 중 균체내에 생성된 항생물질이 균체외로 유출되는 효과가 증진된 것에 기인한다.

• Journal of Nutrition and Health
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• 제26권9호
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• pp.1118-1128
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• 1993

This study was undertaken to investigate the acute effect of caffeine consumption on the change of mineral concentration in serum and urinary mineral excretion in healthy young females. On two separate mornings at one week intervals, each subject drank a coffee which contained no caffeine and 3mg/kg body weight caffeine. To obviate dietary effects on mineral concentration in serum and urine, each subject fasted at least ten hours before consuming the test beverage. At one, two, three and four hours, serum and urine production collected seperately for measurement of sodium, potassium, calcium, phosphorus and magnesium concentration. The results were as following : 1) Mean age of subjects was 20.6$\pm$0.32, Mean body mass index of subjects was 21.64$\pm$0.89, which was within $\pm$10% of ideal body weight. 2) Total urine volume of caffein groups for 4 hour after caffeine consumption was higher than that of decaffeine one, but urine pH was unchanged after caffeine consumption. Total urinary four hour excretion of creatinine was not affected by caffeine consumption and creatinine clearance also was not different from the control value. 3) In serum, mean three hour content of sodium(p<0.01) and phosphorus was higher in the subject given the caffeine. Mean serum magnesium and calcium contents were lower in caffeine group than that of decaffeine one. Mean serum magnesium content for three hour after caffeine ingestion was affected by caffeine consumption(p<0.001). Mean serum content of potassium was unaffected by caffeine consumption. 4) Total urinary four hour excretion of sodium, increased significantly after caffeine consumption(p<0.05), while total urinary four hour excretion of potassium, calcium, phosphorus and magnesium was unchanged after caffeine intake. Urinary excretion of Na, Ca, P and Mg was greatest at one hour after caffeine consumption, especially urinary sodium and potassium excretion was significantly high(p<0.05, p<0.01). The above results show that only 3mg caffeine per kg body weight increase the urinary macro mineral excretion in healthy young females.