• 대한수학회보
• /
• 제35권3호
• /
• pp.465-471
• /
• 1998

The class of finite solube groups with zero deficiency known to have soluble lenght five or six is small. In this paper we exhibit some classes of such goups.

• 대한핵의학회지
• /
• 제27권1호
• /
• pp.123-129
• /
• 1993

$^{85}Sr$만을 투여한 대조군에 비해 $^{85}Sr$의 오염에 앞서 3% 카이토산을 체내에 투여한 경우 $^{85}Sr$의 체내 잔존율이 서서히 낮아지는 경향을 보였다. 그 배출효과에 있어서 위장관에 의해 1일 1회 5일간의 연속투여군에서는 1회 단일투여의 경우와 유사하게 나타났으나 수용성 카이토산의 경우 1회 투여군에서는 불용성에 비해 큰 차이를 보이지 않았고, 1일 1회 5일 간의 연속 투여군에서는 약2배 이상 그 배출율이 증가하여 연속적으로 투여하였을 때 방사선 스트론튬이 체내대사에 영향을 줄 수 있음을 시사하였다. 배출물의 경우 변증으로 대부분이 배출되며 카이토산의 투여군에서는 뇨를 통한 배출은 대조군에 비해 높게 나타났고 수용성 카이토산의 투여군에 의해 방사성 스트론륨의 소화관 흡수가 저해되어 결과적으로 배출이 촉진될 뿐만 아니라 골대사 중에 작용하여 표적 기관으로부터 $^{85}Sr$을 추출시키는데도 관여할 가능성을 시사했다. 결론적으로 본 실험에서는 수용성 카이토산과 불용성 카이토산이 방사능 방호약제로 유효하게 쓰일 수 있으며 그중 3% 수용성 카이토산은 연속적으로 투여 한 경우 $^{85}Sr$의 체내 대사에 영향을 미쳐 장기간 투여시 $^{85}Sr$을 체외로 배출시 키는데 기여 할 수 있으리라 기대된다.

• 한국축산식품학회지
• /
• 제39권4호
• /
• pp.643-654
• /
• 2019

The amino acid composition, protein quality, and protein functionality of protein solution extracted from three edible insect species were investigated. We used 0.02% ascorbic acid and 0.58 M saline solution to extract water-soluble and salt-soluble proteins from the three insect species. Extracted protein solutions of Tenebrio molitor (TM), Allomyrina dichotoma (AD), and Protaetia brevitarsis seulensis (PB) were divided into six groups, according to species and solubility: WTM, WAD, WPB (water-soluble), and STM, SAD, and SPB (salt-soluble). Defatted TM had the highest protein content, but its protein solubility was the lowest, for both water and saline solutions. Amino acid composition differed by edible insect species and buffer type; SPB had the highest protein quality, followed by WPB. PB had a higher pH than the other species. Color values also differed among species. SPB had abundant high molecular weight proteins, compared with other treatments; and also had the highest foaming capacity, foam stability, and emulsifying capacity. In conclusion, PB is a good source of functional protein compared with the other studied species. Additionally, protein extraction using saline solution is promising as a useful method for improving edible insect protein functionality.

• 한국동물학회지
• /
• 제37권2호
• /
• pp.249-254
• /
• 1994

Soluble protein of the eight species of the Drosophila melanogaster species group was analyzed for three developmental stages of lanra, pupa and adult by 2DE. Genetic distances were calculated by Aquadro and Aviso's equation for three developmental stages, respectively. The dendrosrams showed the same patterns in three stages. The dendrograms showed that the melonogaster species group consisted of two clustered groups. Total soluble protein contents on three developmental stages of the eight species were compared. Closely related species showed resemblant protein changing pattern during development, and their developmental changing patterns were different according to the subgroup.

• 환경생물
• /
• 제31권4호
• /
• pp.458-470
• /
• 2013

Haliotis discus, a useful abalone of herbivorous gastropod, shows feeding preference to marine algae depending upon their growth stage and recognition of taste. This study was carried out to investigate this abalone's algal preferences and the presence of feeding stimulants. In single-choice experiments the small (S) group generally preferred Ulva pertusa (Chlorophyta), whereas the medium (M) and large (L) group preferred both Laminaria japonica (Phaeophyta) and Undaria pinnatifida (Phaeophyta). In multi-choice experiments using 4 algal species of L. japonica, U. pertusa, U. pinnatifida and Ecklonia cava (Phaeophyta), the results were same as in the single-choice experiments; the S group preferred U. pertusa the most, while the M and L group preferred both U. pinnatifida and L. japonica. However E. cava was not preferred by any groups. In order to examine the presence of feeding stimulant, chemical compounds from algae used as feed were isolated and identified. The abalone responded to water soluble matters of L. japonica, U. pinnatifida and U. pertusa, but those of E. cava and Sargassum sagamianum (Phaeophyta) were not attractive to them. In feeding stimulant experiments using fat soluble matters, the S group preferred the fat soluble matter of U. pertusa the most, while the M group and the L group preferred those of U. pertusa and U. pinnatifida, and those of L. japonica, respectively. However the fat soluble matter of S. sagamianum was not attractive to the abalone. The results of feeding stimulant experiments were same as those of single-choice or multi-choice experiments, which showed that compound lipids in fat soluble matter might act as feeding-stimulant.

• 한국입자에어로졸학회지
• /
• 제17권3호
• /
• pp.43-54
• /
• 2021

Size distributions of atmospheric particulate matter (PM) and its water-soluble organic and inorganic components were measured between January and February 2021 at an urban site in Gwangju in order to identify the major factors that determine their size distributions. Their size distributions during the study period were mainly divided into two groups. In the first group, PM, NO₃^-, SO₄^2-, NH₄⁺ and water-soluble organic carbon (WSOC) exhibited bi-modal size distributions with a dominant condensation mode at a particle size of 0.32 ㎛. This group was dominated by local production of secondary water-soluble components under atmospheric stagnation and low relative humidity (RH) conditions, rather than long-range transportation of aerosol particles from China. On the other hand, in the second group, they showed tri-modal size distributions with a very pronounced droplet mode at a diameter of 1.0 ㎛. These size distributions were attributable to the local generation and accumulation of secondary aerosol particles under atmospheric conditions such as atmospheric stagnation and high RH, and an increase in the influx of atmospheric aerosol particles by long-distance transportation abroad. Contributions of droplet mode NO₃^-, SO₄^2-, NH₄⁺ and WSOC to fine particles in the second group were significantly higher than those in the first group period. However, their condensation mode contributions were about two-fold higher in the first group than in the second group. The significant difference in the size distribution of the accumulation mode of the WSOC and secondary ionic components between the two groups was due to the influx of aerosol particles with a long residence time by long-distance transport from China and local weather conditions (e.g., RH).

• 대한화장품학회:학술대회논문집
• /
• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book I
• /
• pp.313-319
• /
• 2003

It is well known that ascorbic acid (VC) is an important factor for several physiological reactions. In the skin, VC works as an anti-aging agent due to removing of oxidative stress generated by UV irradiation and stimulation of collagen synthesis. Thus, developing more effective VC derivatives is an important issue in creating anti-aging skin care products. Our study succeeded to develop a novel ascorbic acid derivative, ascorbic acid tetra-2-hexyldecanoate (VC-IP), which is a lipid-soluble pro-VC. The purpose of this study was to indicate the effects of VC-IP as pro-VC and anti-aging agent. First, it was examined whether VC-IP is converted to VC in physiological conditions. Since VC was detected from the cell extracts treated with VC-IP, it was indicated that VC-IP is a pro- VC.(omiited)

• 생명과학회지
• /
• 제11권4호
• /
• pp.328-334
• /
• 2001

Male Sprageu-Dawely rats fed a cholesterol diet (Control group) or cholesterol diet supplemented with the water-soluble extract of stem bark from Cudrania tricuspidata(CTSB group) at the level of 0.5% for 2 weeks. Concentration of triglyceride in serum of CTSB group was significantly lower than that of control group. However, the other lipids concentrations of liver and serum, body weight gain, and food intake did not show significant difference between CTSB group and control group. Antioxidative activities of water-soluble extract from stem bark of Cudrania tricuspidata on the lipid peroxidation in rat were also studied in vivo by measuring the formation of thiobarbituric acid reactive substance(TBARS). Concentration of TBATS in the liver homogenates of CTSB group was significantly higher than that in control group. Nonheme iron concentration was significantly increased in the liver of CTSB group compared to control group. suggested that enhanced nonheme irom was associated with enhanced peroxidation of liver in CTSB group. These results suggested that water soluble extract from stem bark of Cudrania tricuspidata exert the hypotriglycerolemic effect and might amplify the lipid peroxidation of tissues in cholesterol fed rats.

• Preventive Nutrition and Food Science
• /
• 제12권4호
• /
• pp.217-221
• /
• 2007

Within the elderly population, the use of calcium supplements and the intake of calcium from food are on the rise in order to maintain health. Calcium is absorbed as an ion in vivo, leading to speculation that absorption efficiency is affected by the solubility of the calcium consumed. In our study, the bioavailability of two types of calcium supplements with different solubilities was evaluated. Experimental animals were fed water-soluble or insoluble calcium supplements for 6 weeks. We found that blood alkali phosphatase activity, osteocalcin content, and urine crosslinks values were not different between the groups. Similarly, the degree of apparent calcium absorption between the two calcium supplements was not significantly different. The bone mineral density and bone mineral content of the femur and the tibia increased in the group that consumed insoluble calcium compared with those of the water-soluble calcium supplemented group. However, when considering body weight, the bone mineral density value for all areas, including the spine, was significantly higher in the group that consumed the water-soluble calcium supplement.

• 한국지역사회생활과학회지
• /
• 제16권4호
• /
• pp.39-45
• /
• 2005

본 연구는 동, 식물성 단백질 식이에 고콜레스테롤을 공급한 식이와 열수 추출한 녹차급여가 지질대사와 항산화계에 미치는 효과를 알아보고자 한국 사람들이 보통 전통차로 음용하는 조건인 $0.5\%$ 녹차열수 추출물을 동물성 단백질인 카제인,식품성 단백질인 대두 단백질과 고콜레스테롤을 체중이 약 180g이 되는 Sprague-Dawley종 수 컷 흰쥐에 공급하여 지방대사와 항산화계에 미치는 영향을 보고자하였다. 4주간 실험식이로 사육한 후 혈청지질성분과, 간의 지질성분, 간의 항산화 효소 활성과 과산화물인 TBARS의 양을 측정하였다. 그 결과는 다음과 같다. 1. 체중증가량과 FER은 전반적으로 대두단백질 군보다 카제인 군이 높았고 카제인 군에서는 녹차열수추출물을 공급하였을 때 체중증가량과 FER이 유의적으로 감소하였다(P < 0.05). 식이섭취량은 유의적인 차이를 보이지 않았다. 2. 혈청 중의 총콜레스테롤, LDL-콜레스테롤 농도는 전반적으로 대두단백질 군보다 카제인 군이 높았으나 카제인군의 LDL-콜레스테롤 농도만이 녹차열수추출물을 공급하엿을 때 유의하게 낮게 나타났다(P < 0.05). 3. 간의 중성지방 함량은 전반적으로 대두단백질 군보다 카제인 군이 높았으나 녹차열수추출물을 공급했을 때 대두단백질 군에서만 중성지방 함량이 유의하게 낮게 나타났다(P < 0.05). 4. 간의 항산화효소의 활성은 모든 군에서 유의한 차이가 없었으나 TBARS 함량은 녹차열수추출물을 공급했을 때 카제인 군에서만 유의하게 낮게 나타났다(P < 0.05). 이결과로 보면 식물성 단백질군 보다는 동물성 단백질군에 녹차 열수 추출물을 공급하였을 때 사료효율, 체중감소, 혈청 LDL-콜레스테롤과 간의 TBARS(thiovarbituric acid reactivesubstance) 생성을 낮추는 효과를 보여주었다. 간의 중성지방의 경우는 대두단백질 군에서만 녹차열수추물 공급에 따라 낮아지는 효과가 있었다(P < 0.05). 그러므로 녹차 열수 추출물이 지방대사와 항산화계에 미치는 영향은 식물성단백질 보다는 동물성 단백질이 공급된 식이에 건강에 바람직한 영향을 미치는 것으로 나타났다.