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Search Results: 1 - 10 of 40058 matches for " Kyung Min Kim "
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Analysis of Low Amylose and Processability Fractured Endosperms Derived from Somatic Variation  [PDF]
Gihwan Yi, Kyung Min Kim
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.46A003
Abstract: Recently, improving eating quality and processing properties has become one of the most important objectives in japonica rice breeding programs in Korea. This study was carried out to determine the agronomy and physicochemical characteristics of the opaque endosperm rice \"S-21-3-8\" regenerated from seed-derived callus culture of a rice cultivar, \"Ilpum\". S3 generation of opaque endosperm mutants selected from pedigree breeding was used for analysis of agronomic and physicochemical traits. Genetic segregation was observed at the highest frequency among opaque endosperm mutants, being present in 85.7% (12/14 lines) of the entire opaque lines. However, the major agricultural characteristics and grain traits of \"S-21-3-8\" were similar to those of a donor cultivar, \"Ilpum\". \"S-21-3-8\" showed significantly lower (10.6%) amylose than those (17.7%) of \"Ilpum\" in brown rice, while the protein levels were similar to those of the donor plant. The grain hardness of \"S-21-3-8\" (1.67 kgf/mm2) was lower than that of \"Ilpum\" (1.97 kgf/mm2), resulting in a high flour-milling percentage. The loosely packed starch granules of \"S-21-3-8\" in the opaque endosperm were demonstrated by SEM analysis of cross-sectioned rice grains. The opaque endosperm mutants that were of somaclonal variations in the tissue culture will lead to improved eating quality and processing properties of rice.
Analysis of Genetic and Biogeography Diversity of Korean Indigenous Wild Rocambole (Allium monanthum Max)  [PDF]
Gihwan Yi, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45130

This study was conducted to obtain baseline data describing Allium monanthum Max. for breeding an elite cultivar. A. monanthum has recently become popular vegetable in Korea owing to its unique flavors and nutraceutical effects. The agronomic traits of 271 accessions of A. monanthum collected throughout Korea were evaluated in this study. Leaf width showed the greatest variation (0.1 to 25 mm) among traits evaluated, followed by leaf sheath length and number of cormlets. The average leaf sheath length and diameter, which are commonly used to evaluate quality in the market, were 1.29 cm and 0.3 cm. Some superior accessions had a leaf sheath length of >10 cm and diameter of >1.1 cm. The average weight of the cormlets ranged from 1 to 2 g; however, one accession weighed more than 4 g. The genetic diversity of A. monanthum calculated based on morphology and molecular distance was greater in Jeolla and Gyeoungsang provinces than Gyeonggi and Chungcheong provinces. Finally, seven elite accessions of A. monanthum were selected owing to their potential usefulness in future breeding projects.

Effective Procedure for Development of EST-SSR Markers Using cDNA Library  [PDF]
Kyung A Kim, Hee-Cheon Park, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39159
Abstract: The present study was conducted to develop EST-SSR markers using the cDNA library from rice plant. Total RNA extracted from the leaves of brown plant hopper resistance gene originated from a rice cultivar “Cheongcheong” and sensitive rice cultivar “Nakdong” were used to synthesize a cDNA library. As a result of analyzing the cDNA library, the 17 EST-SSR primer sets were developed. This study enables to provide effective marker assisted selection (MAS) methods on the selection of white-backed planthopper resistance gene originated from a rice plant more simply, quickly and precisely. Furthermore, using this marker’s advantage of deriving from cDNA, it is possible to identify the white-backed planthopper resistance gene. In addition, this study introduces a technique for construction of a cDNA library safely without using radioactivity.
Effect of Maltose Concentration on Plant Regeneration of Anther Culture with Different Genotypes in Rice (Oryza sativa L.)  [PDF]
Seul Gi Park, Mohammad Ubaidillah, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.411279

This study describes the impact of different concentrations of maltose on plant regeneration of anther culture for five genotypes of rice (Oryza sativa). N6 medium was used for calli induction, while N6 medium supplemented with different concentrations of maltose, 2.0 mg/L NAA and 0.5 mg/L kinase was used for plant regeneration. The result showed that during the initial stages of calli induction the anther cultures had varying rates of calli formation among genotypes, with the best frequency being observed for Dreami2/CaMsrB2-8-DH-1 with a calli frequency of 27.8%. Different genotypes of rice cultured in regeneration media showed varying plantlet regeneration on media supplemented with different concentrations of maltose, with low concentrations (0.04 g/L) leading to low frequency regeneration plantlet but high green plant production. Indeed, when Dreami2/CaMsrB2-8-DH-2 and Dreami2/CaMsrB2-8-DH-5 were cultivated under these conditions, 100% green plants were observed. Another genotype also showed a small rate of albino frequency in response to the lowest concentration of maltose, while increased maltose concentrations

The Effect of Cardiovascular Responses after Aerobic Exercise in Menstrual Cycle  [PDF]
Joonsung Park, Mi-Song Kim, Hosung Nho, Kyung-Ae Kim, Jong-Kyung Kim, Hyun-Min Choi
Health (Health) , 2017, DOI: 10.4236/health.2017.93030
Abstract: Purpose: We investigated the effect of menstrual cycle on the cardiovascular responses during recovery period from exercise. 10 healthy women were participated in the early follicular phase (EP: low estrogen and low progesterone: 1 - 4 days) and the late follicular phase (LP: high estrogen and low progesterone: 10 - 13 days) during menstrual cycle. Methods: All subjects completed a graded cycling exercise testing to determine the relative exercise intensity. All subjects were assessed systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR), stroke volume (SV), cardiac output (CO), and total vascular conductance (TVC) at resting and during recovery period from moderated cycling exercise during EP and LP. Results: During EP, compared with LP, resting SBP and MAP were higher and TVC was lower (p < 0.05). During recovery from exercise, SBP and MAP were higher and TVC lower during EP compared with LP (p < 0.05). There were no differences in HR, SV and CO in both phases. Conclusions: This study could be increased the peripheral vasoconstriction in low estrogen levels. And during early follicular phase with low estrogen level, it may maintain an increased blood pressure during recovery period following cycling. We suggest that the timing of the menstrual cycle should be considered when measuring blood pressure during clinical exercise testing.
Analysis of Rice Grain Quality-Associated Quantitative Trait Loci by Using Genetic Mapping  [PDF]
Byung-Wook Yun, Min-Gyu Kim, Tri Handoyo, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.59125

The main objective of this research was to identify quantitative trait loci associated with rice qualities to provide reliable information for marker-assisted selection and development of new varieties. In total, 120 doubled haploid (DH) lines developed by another culture from the F1 hybrid of a cross between “Cheongcheong”, a Tongil variety, and “Nagdong”, a japonica variety, were used. A microsatellite linkage map of 222 markers spanned 2082.4 centimorgans (cM) and covered 12 rice chromosomes with an average interval of 9.4cM between markers. Eight quantitative trait loci (QTLs) were associated with rice quality, consisting of two QTLs on chromosomes 1 and 9 for amylose content; three QTLs on chromosomes 8, 9, and 10 for protein content; and three QTLs on chromosomes 2, 3, and 6 for lipid content. PCR expression levels measured using the SSR markers RM23914 for proteins and RM6266 for lipids, and RM586 showed a higher degree of amplification. The present study should be useful for improving the nutritional quality of rice by means of marker-assisted selection.

Development of the Biopolymeric Optical Planar Waveguide with Nanopattern  [PDF]
Seung H. Yoon, Won T. Jeong, Kyung C. Kim, Kyung J. Kim, Min C. Oh, Sang M. Lee
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.12009
Abstract: This paper demonstrates for fabricating the biopolymric optical planar waveguide. Gelatin and chitosan were mixed with ratio of 9 to 1 and stirred at 70°C with 1300 rpm. The blended biopolymer was spincoated on silicon substrate with 500 rpm and then dried in the oven at 50°C. The refractive indices of the prepared biopolymer clad and core layers of the waveguide were measured by the ellipsometry. The measured refractive indices of the two layers were obtained to be 1.516 and 1.52, respectively. The nanograting was successfully imprinted on surface of the biopolymeric waveguide.
Physicochemical Characteristics and QTL Mapping Associated with the Lipid Content of High-Lipid Rice  [PDF]
Na-Hye Kim, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410241

This study was conducted to examine the physicochemical characteristics and perform QTL mapping of genetic factors associated with the lipid content of rice. A rice strain with a high lipid content, P31-2-2-2-B-B, was developed from mutants of Dongjin created by T-DNA insertion. The lipid content of P31-2-2-2-B-B brown rice was 4.42% whereas that of the donor cultivar Dongjin was 2.56%. The total fatty acid content of the high-lipid mutant brown rice was 7.82% and that of Dongjin was 3.43%. The unsaturated fatty acid composition of the mutant brown rice was 2.73% oleic acid, 2.74% linoleic acid, and 0.34% linolenic acid. In contrast, the fatty acid composition of the donor cultivar Dongjinwas 1.30% oleic acid and 0.99% linoleic acid. The percentage of unsaturated fatty acid to total fatty acid in the high-lipid mutant was higher

QTL Analysis of Yield Components in Rice Using a Cheongcheong/Nagdong Doubled Haploid Genetic Map  [PDF]
Gyu Hwan Park, Jin-Hee Kim, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.59130

In this study, only two of 12 quantitative trait loci (QTLs) affecting yield and yield components were identified in a single year, indicating that individual QTLs are probably sensitive to the environment. A rice growth survey of “Cheongcheong” and “Nag dong” in a doubled haploid population in 2012 revealed that yield capacity was influenced by climate change. Analysis of yield and yield components indicated that five average traits are high in “Cheongcheong”. Frequency distribution tables indicated that panicles per plant (PPP), spike lets per panicle (SPP), and 1000-grain weight (TGW) were normally distributed. The strongest relationship was identified between SPP and seed set percentage (SSP) among phenotypic correlations related to yield and yield components found on chromosomes 2, 3, 6, 8 in 2012. SPP and SSP was a very relevant requisite about quantity. Analysis of QTL about quantity was total 9. In the present study, a doubled haploid population was used to analyze the epistatic effects on yield and yield components in rice. Although other epistatic QTLs were not included in any of the main-effect QTLs, they significantly influenced the traits. These results indicated that epistatic interaction plays an important role in controlling the expression of complex traits. Thus, the utilization of marker-assisted selection in rice breeding programs should take epistatic effects into consideration. Hence, the QTLs responsible for major effects are more suitable for marker-assisted selection programs to improve yield and related traits across different environments.

Market Segmentation, Price Disparity, and Transmission of Pricing Information: Evidence from Class A and H Shares of Chinese Dual-Listed Companies  [PDF]
Kyung-Won Kim, Yong Hyeon Kim, Chul W. Park, Hong-Ghi Min
Journal of Financial Risk Management (JFRM) , 2015, DOI: 10.4236/jfrm.2015.43011
Abstract: This paper examines the transmission of pricing information and the volatility of dual-listed stocks between class A and H shares of Chinese companies. First, using firm level data, we show that there is a large price discount for H shares relative to the A shares. Second, when we divide the firms into a high price disparity group and a low price disparity group, we find that the high price disparity group’s pricing information transmission is stronger than the low price disparity group during the pre-liberalization period (in terms of significant mean coefficients). Third, when we divide the entire sample period into a pre-liberalization period and a post-liberalization, we find that the mean value spillover is stronger during the post-liberalization period for the low price disparity group. Finally, we report that during the post-liberalization period, the volatility spillover increases from A shares to H shares while it decreases from H shares to A shares. This implies that there is an information advantage of H shares, disappearing with the liberalization of A shares.
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