• BMB Reports
• /
• v.29 no.4
• /
• pp.343-352
• /
• 1996

The biosynthesis of phospholipid and the composition of fatty acid were analyzed in mitochondria isolated from Chlorella ellipsoidea treated with carbon sources (glucose, sucrose, raffinose) during the culture. The growth of Chlorella and total lipid contents in mitochondria treated with various carbon sources was increased to compare with the control. When Chlorella mitochondria was treated with various carbon sources, four kinds of phospholipid were increased predominantly. The major fatty acids utilized for the biosynthesis of the phospholipid were analyzed linoleic acid (average 25.18%) and stearic acid (average 10.52%) in the control. But, it was shown that the major fatty acids in Chlorella mitochondria treated with glucose were stearic acid (average 30.93%), palmitic acid (average 17.47%) and stearic acid (average 20.31%), linoleic acid (average 16.68%) in sucrose treatment and oleic acid (average 17.17%), palmitic acid (average 15.64%) in raffinose treatment.

• Proceedings of the Mineralogical Society of Korea Conference
• /
• 2005.05a
• /
• pp.50-57
• /
• 2005

Although the bulk composition of materials is one of the major considerations in extractive metallurgy and environmental science, surface composition and topography (edges and dislocations are preferred sites for physicochemical reactions) control surface reactivity, and consequently play a major role in determining metallurgical phenomena and pollution by heavy metals and organics. An understanding of interaction mechanisms of different chemical species with the mineral surface in an aqueous media is very important in natural environment and metallurgical processing. X-ray photoelectron spectroscopy (XPS) has been used as an ex-situ analytical technique, but the material to be analyzed can be any size from $100{\mu}m$ up to about 1 cm. It can also measure mixed solids powders, but it is impossible to ascertain the original source of resulting x-ray signals where they were emitted from, since it radiates and scans the macro sample surface area.

• Fisheries and Aquatic Sciences
• /
• v.13 no.3
• /
• pp.206-209
• /
• 2010

Chum salmon (Oncorhynchus keta) meat oil contained high amounts of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) compared to oils extracted from other tissues of the fish. EPA and DHA occupied more than 25% of the total fatty acids in chum salmon meat oil. The main lipid classes in the meat oil were triacylglycerides and phospholipids. The major fatty acids of the molecular species composition of phosphatidylcholine isolated from the meat oil were DHA and EPA. DHA and EPA were the major molecular species in the phosphatidylcholine of chum salmon meat oil, representing 44% and 17%, respectively.

• Journal of the Korean Ceramic Society
• /
• v.32 no.11
• /
• pp.1308-1314
• /
• 1995

Changes in phase and microstructure were investigated in the SiC-AlN ceramics prepared by pressureless sintering using yttrium aluminum garnet (YAG) as a sintering aid at 200$0^{\circ}C$ and 210$0^{\circ}C$. The SiC/AlN ratio made a remarkable difference in densification, phase relations and the morphology of grains. In the AlN-rich composition, major phase was 2H and microstructure was composed of the densified equiaxed grains irrespective of the sintering temperatures. While those sintered at 200$0^{\circ}C$ were porous with major phase being 3C, the rod-like and the equiaxed grains were coexisted when sintered at 210$0^{\circ}C$ in the SiC-rich composition.

• Journal of Korean Society for Atmospheric Environment
• /
• v.12 no.4
• /
• pp.377-387
• /
• 1996

This study was carried out to monitor the visibility including measurement and analysis of the various parameters such as particle size distribution, chemical composition, and meteorotical conditions to understand the characteristics and causes of this phenomenon. According to the analysis of intensive sampling, $SO_4^{2-}, NO-3^-, Cl^-, NH_4^+$ ion concentration increased together with the mass concentration around 1 $\mu$m in the case of low visibility. $(NH_4)_2SO_4, NH_4NO_3$, and $NH_4Cl$ were thought to be the major components of fine particles. The statistical analysis showed that the scattering effect of particle was 81.2%, the absorption effect was 14.9%. Therefore, these effects were the major factors to reduce the visibility. In conclusion, the visibility was reduced by the fine particle of sulfate (18.6%), nitrate (14.2%), organic carbon (10.8%), element carbon (25.8%), and residual (24.8%) during this study.

• Journal of the Korean Applied Science and Technology
• /
• v.9 no.1
• /
• pp.25-30
• /
• 1992

The needles and pollen of Pinus densiflora and Pinus koraiensis were studied for their lipid contents and fatty acid composition. The total lipid contents in needles of Pinus densiflora and Pinus koraiensis were 5.0 and 4.5%, whereas in pollen of Pinus densiflora and Pinus koraiensis 3.5 and 5.6%, respectively. Twenty-four fatty acids ranged from lauric acid to docosahexaenoic acid(22:6${\omega}$3) were identified in the needle lipids. In needles, linolenic acid and palmitic acid were the major fatty acids. The needles of Pinus densiflora showed higher proportions of docosahexaenoic acid and 5-olefinic nonmethylene-interrupted polyenoic acids than those in the Pinus koraiensis. Twenty fatty acids ranged from myristic acid to lignoceric acid were identified in the pollen lipids. Linoleic acid was the major fatty acid in the pollen followed by oleic and palmitic acid. The fatty acid profile of pollen of Pinus densiflora was similar to those of the Pinus koraiensis pollen lipids.

• KIEAE Journal
• /
• v.12 no.4
• /
• pp.31-40
• /
• 2012

This study of elderly households living conditions to determine the overall status in the housing environment is to understand. To this end, the stage of elderly as a framework to target living consciousness, living space composition, housing Environment composition of elderly households with a comprehensive understanding and analyzes were employed. For this research is a survey conducted on senior citizens(over 60) in Busan, Korea. The major findings are as followings; In the living consciousness, the elderly households showed high perception of dependency but the age of the elderly increases, depends on the parent to the child. Also depending on the aging of the elderly considered health more important than economic conditions. The requirements for living space composition, most respondents prefer to stay in the same place where they currently reside. Move into the new housing was also identified. It was recognized that elderly households not only required living in co-residential space with their families, but also the necessity for individual space. The home environments composition, health care and social welfare support services appears overall the elderly of stage. The age of the elderly increases, a strong demand for care and support service were identified. Health activities in leisure and social activities and social activities, as age increased mainly done by the convenience of public transportation has been identified that are important.

• Biomedical Science Letters
• /
• v.16 no.3
• /
• pp.169-177
• /
• 2010

Osteoporosis is a disease that increases the fracture rates and a major cause of increased mortality and morbidity in the elderly people. This study is to determine which components of body composition and metabolic syndrome risk factors are important to bone health, we analysed the relationship among bone mineral density (BMD), body composition and metabolic syndrome risk factors in females. Totally 630 females participated in a medical check-up program (mean age 47 years) were selected for this study. Body composition analysis was performed by segmental bioelectrical impedance method, muscle mass, and percent body fat were measured. We also measured metabolic syndrome risk factors including abdominal obesity, HDL-cholesterol, triglyceride, blood pressure and fasting glucose level. Metabolic syndrome was defined by NCEP-ATP III criteria. The lumbar spine and femoral neck BMD were measured using the dual energy X-ray absorptiometry. Osteopenia and osteoporosis were observed in 180 and 51 persons, respectively. Muscle mass and HDL-cholesterol decreased in osteopenia and osteoporosis groups compared to the control group, and the grade was shown progressively by the symptoms. Significant positive correlation between BMD and muscle mass was observed. Multi variable regression analyses showed that % body fat and muscle mass were independent predictors of BMD after adjustment of age, height and weight. In conclusion, the BMD showed negative correlation with the metabolic and body composition was associated with BMD.

• Proceedings of the Zoological Society Korea Conference
• /
• 1994.10a
• /
• pp.103.2-103
• /
• 1994

No Abstract, See Full Text

• Journal of Astronomy and Space Sciences
• /
• v.11 no.2
• /
• pp.165-174
• /
• 1994

We have investigated the chemical composition of dust grains in novae by computing the model spectra for the novae that showed temporary infrared developments shortly after their optical explosions. We find that a simple spherical dust shell models with hot blackbody central sources fit observations fairly well. Optical properties of dust grains deduced from modeling of AGB stars have been used for present calculations. We find that amorphous carbon grains appear to be the major infrared re-emission sources for the carbon-rich nova shells, and the silicate grains for the oxygen-rich nova shells.