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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Agricultural Science
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Journal DOI :
CNU Journal of Agricultural Science
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Volume & Issues
Volume 36, Issue 2 - Dec 2009
Volume 36, Issue 1 - Jun 2009
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Study on Waxy Corn - VIII. Botanical and Ear Characteristices of the Yellow Glutinous Corn Hybrid, Daehakchal Gold 1, at Various Planting Stages
Cha, Hui-Jeong ; Choi, Yun-Pyo ; Song, In-Kyu ; Bok, Tae-Gyu ; Lee, Hee-Bong ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 123~127
This study was carried out to gain the informations about seedling transplanting cultivation of Daehakchal Gold 1 which was developed at the Corn Breed. and Genetics Lab., Coll. of Life and Sci., Chungnam Nat'l Univ. in 2009. This hybrid and Check were sowed over four times at intervals of 10 days from 15th April(1st) to 30th May(last) and transplanted at CNU Corn Breed. Farm the 20th seedling cultivated after sowing, respectively. Results obtained from this experiment were as follows; stem height of this hybrid were variable regardless of sowing and transplanting times, while ear height was gradually increased according to delay of sowing times. Ear size and sharp of fresh corn as one of important traits was good at 2nd harvest times, while tip filling of ear harvested at 1st time was not good and also it's size decreased according to delay of transplanting stage. Stability of this hybrid expressed as ratio of stem height to ear height was very good as 50% below. Accordingly, the proper sowing and transplanting times of Daehackchal Gold 1 considered the late in April to early in May as harvesting proper period.
Components Related to Yield of CNU Glutinous Rice Lines on Two Nitrogen Levels
Choi, Yun-Pyo ; Cha, Hui-Jeong ; Bok, Tae-Gyu ; Na, Seung-Yeon ; Jeong, Jong-Tae ; Lee, Hee-Bong ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 129~134
Objectives of this study was to find the effect on two different nitrogen levels about agricultural characteristics of CNU rice lines developed at Crop Genetics and Breeding Laboratory, Chungnam Nat'l Univ.. Materials used were two black and one white glutinous rice lines, which were transplanted by hand with
at CNU paddy field on May 23, 2009. These lines was designed with two replication by two nitrogen levels as 7kg and 9kg per 10a. As the result; Culm length of all lines used were higher at 7kg than 9kg per 10a while panicle length was longer at 9kg nitrogen level. Tillers per plant of CNU 08-01 and CNU 08-02 lines except CNU 08-101 showed highly at 9kg level, but that of other leading varieties were not constant trends in spite of increasing nitrogen. Ripening ratio of CNU 08-01 and 08-02 lines were higher at 7kg but CNU 08-101 line was higher at 9kg. 1,000 grain weight and unhulled rice yield per 20 plants in all CNU lines were highly appeared at 9kg levels per 10a.
Influence of Phosphorus Concentrations in Fertilizer Solution on the Growth and Tissue Nutrient Contents of Egg Plant (Solanum melogena L.)
Kim, Jeong-Man ; Kim, Ju ; Chon, Hyong-Gwon ; Park, Eun-Seok ; Jeong, Jong-Seong ; Choi, Jong-Myung ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 135~145
This research was conducted to investigate the effect of various phosphorus concentrations in fertilizer solution on growth of and nutrient uptake by 'Chugyang' egg plant (Solanum melongena L.). Tissue and soil analyses were also conducted to set the threshold levels of phosphorus in plants when disorders develop for phosphorus deficiency or excess. Brown and purple areas developed on the margin of mature leaves and it enlarged rapidly in P deficient plants. The fruits in P deficient plants were small and dull purple in color. When P were excess in fertigation solution, the margins of lower leaves became scorched and it enlarged to inner part of the leaves. The fruits of P excess plants became small and had the curl shape. The tissue
-P contents in the most recently fully expanded leaves and dry weight of full above ground plant tissue at 35 days after transplanting showed quadratic response (
) and cubic response (
) to elevated
-P concentrations, respectively. When 10% reduction in dry weight set to threshold levels, optimum tissue
-P contents are between 0.98 to 1.35%. The yield determined at 150 days after transplanting also showed cubic response to elevated phosphorus concentrations in fertigation solution (
). When the 10% reduction in yield is set to threshold levels, the tissue
-P contents for maximum yield should be around 1.53% to 2.25% in most recently fully expanded leaves at 150 days after transplanting.
Effect of Postharvest Treatments on Fruit Quality of 'Hong Bak' Peach during Shelf Life
Seo, Jeong-Seok ; Hwang, Yong-Soo ; Chun, Jong-Pil ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 147~158
This study was conducted to investigate the effect of 1-MCP, market temperature and combination treatment of freshing agent with 1-MCP on fruit quality of 'Hong Bak' peach (Prunus persica Batsch). The 1-MCP treatment at the rate of 1000ppb showed the best results in delaying the firmness loss and skin color development during shelf life without any detrimental effects on fruit quality. Moreover, positive effects of 1-MCP on fruit quality parameters were more significant in the fruits stored at
of high temperature shelf life than those of
. The combination treatment of carbon ceramic with 1-MCP showed a beneficial effects including a prevention of firmness loss and maintaining external appearance during the five days of room temperature storage of 'Hong Bak' peach.
In silico Analysis of PERVs Based on the Porcine Genomic Sequence Information
Yu, Seong-Lan ; Lee, Jun-Heon ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 159~165
This study was conducted to identify the PERV (Porcine Endogenous Retrovirus) integration sites and their characterizations using the porcine genomic sequence information. Total 114 Mb (4.2%) sequence of the 2.7 Gb pig genome was investigated for the PERV sequences. As the results, 8 PERV sequences were identified and their genomic structures were deduced from the BLAST searches against previously known PERV genes. Seven PERVs have internal deletions in the protein coding region and they will not be functional. The other one also has internal deletions in the gag and env genes, indicating this PERV is also defective. Even though we could not identify the functional PERVs in this study, the results presented here can be used for the fundamental research materials for controlling PERV infections in relation to xenotransplantation using porcine organs and tissues.
Characterization of the DGAT1 Gene in the Korean Holstein Dairy Cattle Population
Son, Ji-Young ; Jeong, Hang-Jin ; Yu, Seong-Lan ; Lee, Jun-Heon ; Do, Chang-Hee ; Ryoo, Seung-Heui ; Sang, Byung-Chan ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 167~177
This study was conducted to characterize the DGAT1 gene in Korean Holstein dairy cattle population and examine the relationship of DGAT1 polymorphisms with milk yield and milk fat yield for the genetic improvement of Korean Holstein dairy cattle. Results indicated that the 411 bp PCR products were successfully amplified by DGAT1 specific primers. Sequence analysis indicated that the DGTA1 Q allele had AUG (Lysine, K) nucleotide sequences in 216-218 bp and q allele had GCG (Alanine, A) sequences in the same position. Nucleotide sequence homology between the DGAT1 sequences generated in this study showed 100% homology with bovine DGAT1 sequences in the NCBI database. The genotype frequencies of DGAT1 QQ, Qq, and qq were 16.43, 36.43, and 47.14%, respectively, in Korean Holstein dairy cattle population. The observed Q and q allele frequencies were 0.35 and 0.65, respectively. Statistically significant (P<0.05) results were identified for milk yield and milk fat yield for the DGAT1 genotypes. The Qq genotype Holsteins have significantly higher milk yield and milk fat yield than those of the QQ and qq genotype Holsteins(P<0.05).
Effects of Feeding Bovine Colostrum on Growth and Feed Intake of Mouse
Nam, Myoung-Soo ; Bae, Hyoung-Churl ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 179~184
This studies were carried out to assess the effects of feeding bovine colostrum on growth and feed intake of mouse. A total of 30 mice were divided into three groups(10 mice for each groups), and treatments(colostrum, city milk, or no milk as the control) were randomly assigned. Average daily intake of solid feed during the experimental period were 4.73, 3.95 and 3.41g for control, normal milk, and colostrum, respectively. Average daily intake of milk were 0, 9.93, and 10.17g for control, normal milk, and colostrum, respectively. Average daily water intake were 6.28, 4.743, and 4.67g for control, normal milk, and colostrum, respectively. The growth rate of the colostrum group was 16.7% higher compared to the control group (P<0.05). There were differences in the concentrations of IL-4 and IL-13 associated with allergy in mouse blood at colostrum and city milk feeding as compared with control.
Biological Activity and Chemical Analysis of Cattail Pollens
Lee, Bung-Chan ; Park, Hae-Min ; Sim, Hu-Sung ; Kim, Gon-Sup ; Gu, Ja-Hyeong ; Oh, Man-jin ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 185~197
For utilizing Cattail pollen as a raw material for functional foods, the nutrients such as free sugar, free amino acid, fatty acid composition, flavonoid content, and the biological activity within Cattail pollen were measured. The results of proximate analysis within Cattail pollen included the following readings: 12.7-13.2% of moisture, 15.7-17.8% of crude protein, 1.3% of crude fat, 7.5-7.7% of free sugar, 13.7-18.6% of crude fiber, 3.4-4.9% of ash, and 49.7-55.9% of nitrogen free extracts. The composition of free amino acids consisted of 1.923% of T. orientalis, 0.907% of T. angustata, and 0.333% of T. latifolia, which were measurements that varied significantly among different species. However, all species showed considerable portions of GABA alanine, glutamic acid, and proline. Specifically, it was shown that the GABA composition, which is known for increasing immunity while simultaneously lowering blood pressure, exceeded 50%. Therefore, this result implies that Cattail pollens have potential as a powerful utilization for functional foods. The composition of the fatty acids mainly consisted of linoeic, palmitic acid, oleic acid, and linolenic acid, and didn't show many variances across different species. Also, the total contents of unsaturated fatty acid were particularly high with a measured ratio of 67.2-76.0% value. Mineral in Cattail pollen was composed of 0.354-0.492% of K, 0.0516-0.0546% of Mg, 0.045-0.0486% of Ca, and 0.0101-0.0204% of Na. Among the Cattail pollens known as anti-oxidants, flavonoid contains 0.169-0.186% of quercetin, and therefore is the largest constituent followed by rutin making up a measurement of 0.0094-0.0147%. For the purpose of the study, the Cattail pollen and its extracts were fed to SC class rats for a span of 4 weeks. Then, the DPPH radical scavenging activity was measured from the tested rats'serums and the results showed significant variances. Also, the results indicated that the cholesterol and glucose levels in the blood were decreased which in turn led to the conclusion that the cattail pollen can help hyperlipidemia and diabetic treatments.
Changes of Chemical Components during Fermentation of Pear(Pyrus pyrifolia Nakai) Wine
Park, Hae-Min ; Lee, Ka-Soon ; Hong, Jong-Sook ; Oh, Man-Jin ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 199~209
For increasing the consumption of pear, the pear wines were made by using eight different kinds of yeast. The chemical properties, such as pH, acidity, ethanol and sugar contents, and the consumer acceptance of various pear wines were analyzed. In analysis result of chemical properties, the value of pH was decreased and the acidity was increased until few days, and then retained during fermentation. The ethanol content was increased and the sugar content was decreased during fermentation. The pear wine brewed by B yeast (Lalnin, Saccharomyces cerevisiae) among eight different kinds of yeast had the highest content of ethanol, also this wine was represented the most consumer acceptance by the panels who consist of two age groups such as 20's to 30's and 50's to 60's. Therefore, we chose the yeast B for analyzing the effect of additives during fermentation. As the additives, the
and ammonium phosphate as the disinfectant and hemicellulase and pectinase as fermenting conditioner were added into the pear wine brewed by yeast B. When additives are added, the chemical properties were the same as followed. Te values of pH was lower than when additives were not added(control). The acidity was he highest when ammonium phosphate was added, but the acidity was not changed after 4 day fermentation. Sugar contents when added
350ppm was shown the fastest deceasing, and it was orderly decreased as control, ammonium phosphate, hemicellulase, pectinase, and
175ppm. The decreasing rate of sugar content of these 6 test groups during fermentation gradually decreased without a big changes and the after 7 day fermentation, sugar contents were seldom decreased and the final sugar content was
. In terms of change of the content of ethanol, all test groups generated 11~12.4% ethanol after 7 day fermentation. The group where ammonium phosphate was added generated 12.4% alcohol, which is the fastest speed and the group, which hemicellulase additive was added, showed generally slow alcohol generation rate. In terms of ethanol contents, the non-additive group and
additive group showed 0.05%, which is very low, and hemicellulase and pectinase additive group is more than 0.5% which is rather high.
Fatty Acid Composition of Children's Favorite Foods in Daejeon Area
Jang, Jun-Hoe ; Jeon, Mi-Sun ; Lee, Ki-Teak ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 211~217
Total fatty acid compositions, total content of crude fat, saturated, unsaturated and trans fatty acid content were studied in children's favorite foods such as hot dog, chicken popcorn, fried potato, snack and cookies, and imported biscuit. The samples were obtained from various stores in Daejeon. After fat extraction, methylation was carried out to analyze the fatty acid compositions by gas chromatography. The results showed that content of the trans fatty acid per 100 g of the hot dog, chicken popcorn, fried potato, snack and cookies, and imported biscuit were 0.02~0.03 g, 0.05~0.08 g, 0.02~0.05 g, 0.02~0.27 g, and 0.05~0.83 g, respectively. The highest content of saturated fatty acid (66.24%) was observed in the imported biscuit among the 20 analyzed samples.
Flavor Characteristic of Functional Modified-butterfat Synthesized by Lipase-catalyzed Interesterification
Shin, Jung-Ah ; Lee, Ki-Teak ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 219~224
Two functional modified-butterfats (MF668 and MF866) were synthesized with two blends (6:6:8 and 8:6:6, w/w%) of anhydrous butterfat (ABF), palm stearin (PS) and flaxseed oil (FSO, omega-3) via lipase-catalyzed interesterification reaction. Their flavor characteristic was investigated using electronic nose and SPME-GC/MS analysis. Each flavor pattern of ABF, FSO, MF668 and MF866 was significantly discriminated with first principal component score of 95.16% in PCA plot. In functional modified-butterfats analyzed with SPME-GC/MS, various volatile compounds such as aldehydes, ketones, acids, and alkanes were detected.
Formation of Furans during the Acid Hydrolysis of Agar and Their Removal by Treatments of Lime, Steam-stripping and Hydrophobic Resins
Kim, Na-Hyun ; Lee, Jae-Won ; Seo, Yung-Bum ; Yoon, Min-Ho ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 225~232
The ratio of saccharification and formation of furans during the acid hydrolysis of agar with oxalic acid and sulfuric acid were examined base on the contents of the agar and acids. The ratio of saccharification in oxalic acid appeared to be 51~59% somewhat higher than 49~61% of sulfuric acid. Formation of the furans during the acid hydrolysis increased proportional to the contents of agar and acid. The relative formation ratio was high 10~47% for furfural (FUR) and 15~29% for hydroxy-methyl furfural (HMF) in 0.5~1.25% sulfuric acid rather than those of oxalic acid. When comparing the removal efficiency of the furans using an alkali treatment, steam stripping and hydrophobic resins, FUR was eliminated 60% by the alkali treatment, 62~90% by steam stripping and 71~75% by Amberlite XAD4 and 7HP, while HMF was removed to low levels of 10.5%, 4~17% and 13~25%, respectively. The loss of reducing sugar was also observed in process of the removal of furans, and the loss rate was the level of 2~4% in alkali treatment, 11~16% in steam stripping and 7~9% in Amberlite resins.
Income Analysis of Orange Farming in China
Kim, Jai-Hong ; Pan, Li ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 233~244
This study analyzed the income of orange farming of Lichuan, Jiangxi Province in China. Using a questionnaire, 36 farmhouseholds of Lichuan were surveyed. The results are as follows. First, through the investigation of Lichuan orange farming farmhouseholds, we know that the direct expenses of Lichuan orange is around 2,250 RMB/10a and the direct expenses per household's are about 32,000 RMB. The average production of Lichuan orange is 1,548 kg/10a and the income is around 2,200 RMB/10a. The results showed that in Lichuan area orange farming benefit is more than rice so orange farming has been increasing. Second, the direct expense of Lichuan orange farming, 91% is material cost, 8% is labor cost, depreciation cost is only 1.4%. This result show that orange farming in Lichuan is very labor intensive. Third, there are a lots of young orange trees in Lichuan, so income would be increasing through the year.
Introduction and Management Strategies of Traceability System for Environmentally Friendly Agricultural Products in Wholesale Market
Hong, Seung-Jee ;
Korean Journal of Agricultural Science, volume 36, issue 2, 2009, Pages 245~260
Environmentally friendly agricultural products(EFAPs) are on an increasing trend of supply, but not much enhancing the rate of consumption due to higher premiums and consumers' safety concerns. In order to enlarge the consumption of EFAPs and secure the income of the producing farmers, wholesale market should increase the treating amount of EFAPs and introduce traceability system for satisfying consumers' safety concerns. The purpose of this study is to present strategies of traceability system in wholesale market for environmentally friendly agricultural products. For this purpose, current traceability systems that are introduced and managed by government and private association are examined. For the successful management of the EFAPs' traceability system in wholesale market, the trading system, the functions of wholesale market, the level of consumers' safety concerns, and the managing costs should be considered.