• 한국수산과학회지
• /
• 제52권4호
• /
• pp.328-333
• /
• 2019

The proximate composition and mineral contents of 18 subtropical fish species caught off the coast of Jeju Island, Korea were determined. The mean moisture content was highest (78.0%) in the eight species of lean fish, lowest (72.6%) in the four species of medium-fat fish, and intermediate (75.4%) in the six species of low-fat fish. The lipid content was in the order of medium-fat fish > low-fat fish > lean fish. The protein content ranged from 17.7% to 18.9%. The mean macro-mineral contents in the 18 species were 290.2 mg/100 g edible portion K, 146.6 mg P, 113.5 mg Na, 67.2 mg Ca and 38.3 mg Mg. The mean value of micro-mineral contents were 2.1 mg Fe, 1.7 mg Cu and 1.5 mg Zn. These results suggest that subtropical fish from Jeju Island are good sources of protein, lipid and minerals.

• 한국식품영양과학회지
• /
• 제38권8호
• /
• pp.1037-1041
• /
• 2009

아연의 공급수준이 다량 무기질 함량에 미치는 영향을 알아보기 위해 흰쥐를 대상으로 아연을 결핍, 적정, 과잉 수준으로 공급하여 혈청 및 조직의 칼슘, 마그네슘, 나트륨, 칼륨함량을 분석하였다. 아연 공급수준을 달리했을 때 혈청의 다량 무기질 함량은 유의적인 차이를 보이지 않았지만 간과 비장에 영향을 주는 것으로 나타났다. 특히 아연의 결핍은 간의 칼슘 함량을 감소시키는 영향을 주었고, 아연의 과잉은 비장 마그네슘과 칼륨 함량을 감소시키는 결과를 나타냈다. 결론적으로 아연의 결핍과 과잉이 간과 비장의 다량 무기질함량에 영향을 주는 것으로 나타났는데, 특히 아연의 결핍이 더 많은 조직 내 무기질 함량 변화를 가져왔다. 그러나 본 연구에서는 아연의 결핍수준을 적정수준의 50%, 그리고 과잉을 200%로 설정하였으나 앞으로 좀 더 세분화된 아연의 결핍과 과잉 수준에 대한 체계적인 연구가 필요하다고 사료 된다.

• 한국입자에어로졸학회지
• /
• 제7권3호
• /
• pp.79-85
• /
• 2011

Porous $TiO_2-SiO_2$ particles were synthesized by co-assembly of nanoparticles of $TiO_2$ and $SiO_2$ in evaporating aerosol droplets. Poly styrene latex (PSL) particles were employed as a template of porous particles. Flowrate of dispersion gas, weight ratio of $TiO_2/SiO_2$ and $SiO_2$ concentration in the precursor, and PSL size were chosen as process variables. The morphology, crystal structure, chemical bonding, and pore size distribution were analyzed by FE-SEM, XRD, FT-IR, BET. The morphology of porous $TiO_2-SiO_2$ particles was spherical and the average particle size range were from 1 to $10{\mu}m$. The particles were composed of meso and macro pores. The average particle diameter and pore volume of the as prepared particles were dependant on process variables. It was found that UV-Vis absorption of the porous particles was comparable with pure $TiO_2$ nanoparticles even though $TiO_2/SiO_2$ ratio is low in the porous particles.

• Animal Bioscience
• /
• 제36권2호
• /
• pp.167-174
• /
• 2023

Phosphorus (P) is a macro mineral needed for bone mineralization and cell membrane structure and P is also involved in several fundamental pathways of metabolism in the body. Because of the low concentration and digestibility of P in plant ingredients that are the main components of diets for poultry and pigs, feed phosphates are usually included in diets in addition to the P contributed by plant ingredients. The most widely used feed phosphates in poultry and swine diets are dicalcium phosphate (DCP) and monocalcium phosphate (MCP), but tricalcium phosphate (TCP), monosodium phosphate (MSP), and magnesium phosphate (MgP) may be used as well. Because feed phosphates are mostly produced from rock phosphate, feed phosphates have impurities that contain minerals other than P. Concentrations of P in feed phosphates range from 14.8% (MgP) to 25.7% (MSP). The standardized total tract digestibility (STTD) of P in pigs ranges from 71% (TCP) to 95% (MSP). The STTD of Ca and the standardized ileal digestibility (SID) of P and Ca in feed phosphates fed to pigs and poultry have been determined only in a few experiments. Available data indicate that the STTD of Ca and SID of P in MCP are greater than in DCP in both poultry and pigs, but the SID of Ca is similar between DCP and MCP fed to broilers. Information on mineral concentrations and digestibility values in feed phosphates is needed in diet formulation for pigs and poultry, but if diets are formulated to contain equal concentrations of digestible P and Ca, it is unlikely that animal performance will be impacted by the source of feed phosphates used in the diet.

• 자원ㆍ환경경제연구
• /
• 제23권1호
• /
• pp.133-156
• /
• 2014

경제구조를 표현하는 식들로 구성된 모형을 이용하여 도출되는 정량적 분석결과는 성과의 크기를 제시하므로 정책을 평가할 때에 유용하다. 이에 본 논문에서는 해외석유 가스개발사업의 국민경제에 대한 효과를 정량적으로 측정하기 위하여 해외석유 가스개발사업을 반영한 거시경제모형을 구축하고, 이를 이용하여 해외석유 가스개발사업으로부터의 회수액이 GDP, 경상수지, 실업률, 소비자물가, 환율 등에 미치는 효과를 분석하였다. 해외석유 가스개발 사업의 회수액은 우리나라 기업이 해외석유 가스개발사업에 참여하여 획득한 석유 또는 가스를 달러 형태로 금액화한 것이다. 해외석유 가스개발사업을 반영한 거시경제모형은 한국은행의 모형(1997, 2004, 2012)을 이용하여 구축하였으며, 개별 행태방정식의 통계적 적합성과 historical simulation을 통해 모형 전체의 안정성을 확인하였다. 분석결과에 따르면 시간이 경과하면서 해외석유 가스개발사업 회수액의 규모가 커지면서 우리 나라의 거시경제 변수에 미치는 효과의 크기도 커졌다. 변수별로 보면 해외석유 가스개발사업은 경상수지, 실질 GDP, 실업률에 대해서 긍정적인 효과를 유도하였다. 이에 비해서 소비자물가에 대해서는 상승하는, 그리고 환율에 대해서는 하락(원화가치의 평가절상)하는 효과를 보였다. 매해마다 효과의 크기는 다르지만, 2011년 기준으로 해외석유 가스개발사업 회수액은 경상수지를 2.226%, 실질 GDP를 0.401% 증가시키고, 실업률을 0.489%p 감소시켰다. 소비자물가는 0.101% 증가시키고, 원/달러환율은 0.379% 낮추었다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제12권2호
• /
• pp.189-191
• /
• 1999

Mineral profile of serum and cerebrospinal fluid (CSF) of 15 Himalayan Yak (adult female, n=8; adult male n=4 and young male,n=3) was studied in their natural habitat at an altitude of 3300 meters above mean sea level at Sangla in north western Himalayas. The macro and micro minerals estimated in serum and CSF were; Sodium, Potassium, Calcium and Magnesium and Zinc, Copper and Iron respectively. The values recorded among different Yak groups did not significantly differ from each other except serum iron and haemoglobin which were significantly higher (p<0.05 ) in young male Yaks compared to the adult male and female Yaks. An observation of great significance was considerably higher potassium and lower sodium level in Yaks compared to other bovine species of plains. The serum potassium values in some adult female Yaks were recorded as high as 10.4 mEq/l and the values varied between 6.6 to 9.8 mEq/l in young male Yaks. The serum Sodium values and Na:K ratios in Yak serum ranged between 117.5 to 122.6 mEq/l and 13.7 to 15.3 respectively. The possible relationship of high serum Potassium value with hypoxic conditions and hostile mountain environment has been discussed.

• 생물환경조절학회지
• /
• 제17권4호
• /
• pp.252-260
• /
• 2008

본 실험은 장미 식물공장에서 single-node cutting 'Versillia'의 양분흡수 특성을 구명하고 순환식 수경재배 시스템에 적합한 배양액 내 무기이온 조절방식을 구명하고자 수행하였다. 실험 기간동안 각 처리별 배양액 내 무기이온함량 변화를 살펴본 결과 EC 제어구의 경우 $NO_3$-N은 생육 후반이 되면 그 함량이 적정 범위 이상으로 증가 하였고 P와 Mg은 감소하였으며 배양액 첨가구는 전체적인 배양액 내 무기이온 함량이 증가하였다. 이에 비해 무기이온 제어구는 생육 기간동안 근권 내 적정 범위를 유지하였다. 광합성 효율을 나타내는 지표 중 하나인 Fv/Fm는 무기이온제어구와 배양액 첨가구에서 높았고 절화장, 생체중 등은 무기이온 제어구에서 높았다. 그러나 뿌리의 활성 정도를 측정해본 결과 무기이온 제어구에서 높았으나 배양액 첨 가구에서는 생육 초기에 배양액 내 pH 변화폭이 커서 가장 낮게 나타났다. 위의 결과를 종합하였을 때, 무기이온 조절(다량 미량원소 제어구와 다량원소 제어구)을 통해 배양액을 관리하는 것이 생육 전 기간 동안 근권 환경을 적절히 유지해 줄 수 있었고 이에 따라 절화 품질도 향상되므로 장미(single-node cutting) 순환식 수경재배에 적합한 근권 환경 제어방식이라고 할 수 있다.

• 대한영양사협회학술지
• /
• 제11권2호
• /
• pp.242-250
• /
• 2005

The objective of this study is to determine the effectiveness of 4-month milk consumption in the prevention of osteoporosis in elderly women living in Asan. Subjects included 277 women age over 65 years were divided into control (n=111) and milk (n=166) groups. For those in the milk group, one cup (200ml) of partially lactose-digested low-fat milk was provided everyday for 4 months. Each subject was interviewed to assess food intake by 24-h recall method before and after milk supplementation. Prevalence of osteoporosis was determined by WHO criteria with calcaneus bone mineral density (BMD) measured by quantitative ultrasound (QUS) on left heel. After 4 months, the nutrient intake levels of control did not change while intakes of energy, protein, calcium, phosphorous, riboflavin, pyridoxin, niacin and folic acid were significantly increased in milk group. No significant changes were observed in anthropometric, and BMD in both control and milk groups. T-score of milk group, however, was significantly increased after 4 month milk consumption. Prevalence of osteoporosis was increased (27% to 32%) in control group while that of milk group was decreased (32% to 30%). When BMD and t-score changes after 4 months of milk consumption were compared between those with low baseline calcium intake and high calcium intake subjects in the milk group, BMD and t-score were significantly improved in the low baseline calcium intake group. We conclude that one cup a day milk consumption for a relatively short period of 4 months can prevent further bone loss and significantly improve intakes of both macro and micro-nutrients of elderly women.

• Asian-Australasian Journal of Animal Sciences
• /
• 제8권2호
• /
• pp.179-186
• /
• 1995

In the present study, nutritional status of some minerals in sheep grazed on native pasture was investigated in dry area, Ningxia district, of the People's Republic of China. Samples of some forages and blood of sheep were collected for two seasons, dry (March) and rainy (August) seasons. The Ca contents of forages (wheat straw, green-pea straw and some wild grasses) were relatively high as compared with that required ordinarily as standard, but on the contrary, the P content was much lower than that of standard. Consequently, Ca/P ratio was very high in cost of the roughages sampled in the region. Trace elements, Cu and Zn, content of forage samples were fairly low, and the contents of Mo and Fe were fairly high, particularly in some wild grasses, when the values were compared with that required normally. The Ca level in blood of sheep was in a range accepted as normal, and the other macro minerals(Mg and P) were contained at relatively high levels as compared with the values observed ordinarily, but not at a toxic level. With trace minerals, the plasma Fe level was extremely high as compared with the standard level, although there were no disorders due to toxicity, and Mo level in plasma was a little lower than the lower limit described as a normal. The plasma levels of other trace elements (Cu, Zn and Se) in all the animals were within the range accepted as normal. There would be no clear differences in mineral nutrition of sheep between dry and rainy seasons. These results could suggest that there is no severe unbalance and/or imbalance, and grazing sheep in the Ningxia area of midland China have no problems relating to the nutritional status of minerals.

• 한국광물학회지
• /
• 제18권2호
• /
• pp.127-134
• /
• 2005

금속제련공학 및 환경과학 분야에 있어서 물질전체를 구성하고 있는 화학적 조성이 중요한 요소이나, 입자 표면의 화학조성과 미분화된 입자들의 표면 반응성을 제어함과 동시에, 입자 계면에서 일어나는 중금속과 유기물질등의 반응은 제련공정과 환경오염에 중요한 역할을 한다. 그러므로, 수용액상에 존재하는 여러 종류의 화학 물질과 광물입자 표면 사이에서 일어나는 계면반응 과정의 이해는 상당히 중요한 것이다. 일반적으로 입자 표면 분석에는 ex-situ 법을 사용하는 X-ray photo-electron spectroscopy (XPS) 분석 방법이 많이 적용되고 있으나, 이는 분석대상시료의 크기가 보통 100 마이크론에서 1 cm 정도의 범위 안에 혼재-혼합되어있는 고체 입자들을 분석하기 때문에 채취 분석된 X-ray의 원래 발산한 입자표면을 분석할 수는 없다. 그래서 본 연구에서는 Time-of-Flight Secondary-Ion Mass Spectroscopy (TOF-SIMS)를 응용하여 황화광물의 부유선광 공정 중 생성된 미세한 유화광물입자$(30\~75\;microns)$ 표면에 형성된 무기, 유기물의 반응 관찰을 통해 이들의 정성분석 및 상대적 정량분석법을 연구하고자 하였다.