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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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Comparison of Changes in Cell Wall Characteristics during Storage in 'Niitaka' and 'Pingguoli' Pear Fruits
Kim, Jin-Gook ; Piao, Yilong ; Chun, Jong-Pil ; Kataoka, Ikuo ; Hwang, Yong-Soo ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 1~10
The characteristics of fruit ripening and cell wall modifications of two oriental pear fruits were compared during storage. The loss of fresh weight was lower in 'Pingguoli' than 'Niitaka', probably due to the difference in wax accumulation and skin structure. 'Pingguoli' produced much higher amount of ethylene and showed climacteric ripening pattern, but this response was not found in 'Niitaka'. A significant difference in soluble pectin contents was found, thus, the amount of water soluble pectins were much higher in 'Niitaka' at harvest but this difference was not significant at later stage of storage. A severe loss of water soluble pectins in 'Niitaka' was confirmed whereas a similar tendency was not found in CDTA soluble ones. Even the amount of
soluble pectins was relatively low, 'Pingguoli' contained approximately 2 times higher than 'Niitaka' and both cultivars showed an increasing tendency in
soluble polymers at later stage of storage. No significant difference in alkali soluble polysaccharides (hemicelluloses fraction) was found between both cultivars. There was a significant change in gel filtration profiles regardless of cultivars, especially in water soluble pectins resulting from severe depolymerization probably due to degradation of higher molecular weight pectins and loss of their side chains. In gel filtration profiles of
soluble pectins, neutral sugars were evenly distributed regardless of molecular size of pectic polymers but the decrease of high molecular weight fraction was found. In comparison of alkali soluble polymers, a similar trend was found, that is, there was no difference in gel filtration profiles but 'Niitaka' seemed to have longer side chains in alkali soluble polysaccharides in both 4% and 24% of KOH soluble fractions.
A Novel Manufacturing Method of Urea-formaldehyde Resin with the Titanium Dioxide for Reducing Formaldehyde Emission
Park, Han-Sang ; Lee, Hwa-Hyoung ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 11~18
The purpose of this study is to examine a proper amount of addition and a proper point for addition of titanium dioxide for the manufacture of E0 type of urea-formaldehyde resin (UF). The reduction of free formaldehyde from UF resin treated particle board was also investigated.
content was 0.5%, 1% and 3% on the dry basis of UF resin. UV light was used to initiate reaction. The results of this study are as follows: 1. During UF resin manufacturing process, the second adding step of urea was proper point for
addition. 2. 1 % addition of
gave good values for the Eo type urea-formaldehyde resin. 3. There was no significant difference between physical properties of particle board, but the higher the adding content of titanium dioxide resulted in the lower the mechanical properties.
Properties of Recycled Board Made of Disused Wooden Furniture Carbonized at Low Temperature
Seo, In-Su ; Lee, Min-Gyoung ; Lee, Hwa-Hyoung ; Kang, Ho-Yang ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 19~25
This study was carried for recycling laminated PB and MDF of disused furniture. PB and MDF particles taken from disused furniture were heat-treated at
and four levels of treatment time, 2, 4, 6 and 8 hours. The recycled boards were made with heat-treated particles after milling and screening with 100 mesh. The bending strength of the recycled boards were lower than that of virgin boards while their anti-swelling efficiency were much improved. Their formaldehyde emissivity were very low. Thus it was concluded that the recylcled boards are prospective environment-friendly material for interial consturction.
Antagonistic Relationships Between Development of Sporangiophores and Phototropism Depending on Monochromatic Light Wavelengths in Phycomyces blakesleeanus
Lee, Bum-Kyu ; Park, Ae-Ri ; Kim, Hye-Jeong ; Shin, Dong-Ho ; Choi, Kwan-Sam ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 27~40
Six strains of Phycomyces blakesleeanus (DEL, A56, C9, C47, C111, and G5) were cultured in continuous light condition for 6 days. The increase in fresh and dry weight after the culture period was similar in all strains. However, the increase in fresh weight was sustained throughout the culture period in all strains, whereas the increase in dry weight was prominent only during the first 3 days of culture. The development and phototropism of macrophores was observed after 3 days of culture, These results suggest that the development and phototropism is ascribed to the increase in turgor pressure in sporangiophores where water entered. A56 and G5 showed a higher sensitivity to light than C9 and C47, whereas C111 showed no photosensitivity. Antagonistic relations were observed between photosensitivity and development of microphores, suggesting that the development and phototropism of macrophores is regulated by a common recognition factor (photoreceptor).
Anti-cancer effects of enzyme-digested fucoidan extract from seaweed Mozuku
Teruya, Kiichiro ; Matsuda, Sakiko ; Nakano, Ayumi ; Nishimoto, Takuya ; Ueno, Masashi ; Niho, Akitono ; Yamashita, Makiko ; Eto, Hiroshi ; Katakura, Yoshinori ; Shirahata, Sanetaka ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 41~50
Fucoidan is a uniquely-structured sulfated fucose-rich polysaccharide derived from brown algae. Recently, the abalone glycosidase-digested fucoidan extract (fucoidan extract) derived from seaweed Cladosiphon novae-caledoniae Kylin (Mozuku) draws much attention because of its clinical anti-cancer effect in Japan. Here, we report the cancer cells-specific apoptosis inducing effects of the fucoidan extract. The fucoidan extract suppressed the growth of various anchorage-dependent and -independent cancer cells. The fucoidan extract contained low molecular weight components, which induced apoptosis of human leukemic HL 60 cells but not of human lymphocytes. It was shown that the fucoidan extract lead caspase 3/7 activation and loss of mitochondrial membrane potential in HL 60 cells. Another function of the fucoidan extract was also observed. It has been known that sugar chain expression on the surface of cancer cell membrane changes dependent on their malignancy. The analysis on sugar chain expression profiling using FITC-labeled lectins revealed that the expression of concanavalin A (Con A) binding sugar chain was enhanced by the treatment of human lung adenocarcinoma A549, human uterine carcinoma HeLa and human fibrosarcoma HT1080 cells with the fucoidan extract. Con A-induced apoptosis of cancer cells was stimulated in a dose-and time-dependent manner by the treatment with the fucoidan extract but not of human normal fibroblast TIG-1 cells.
Learning of narcotic odors by a parasitoid
Bui, Lan Huong ; Takasu, Keiji ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 51~56
When the parasitic wasp Microplitis croceipes experiences odors while feeding on sugar water, it learns to associate the odors with sugar and thereafter exhibits typical food searching behavior in response to the odors. Previous studies have shown that this wasp can be used for detection of the small amount of explosives or other volatile chemicals. In the present study, we examined if this wasp can learn and report narcotic odors. Males of M. croceipes were trained to link sugar water with pseudo-narcotic scents that have been used for training narcotic detection dogs, and their behavioral response to the trained odors was observed. The males that had been given either an odor or sugar water did not show any positive response to the odors. However, when the wasps were given a combination of sugar water and either the pseudo-Cocaine, Heroin, LSD or Marihuana, they quickly learned to associate the odors with sugar, and thereafter positively responded to those odors. Our results suggest that this wasp can be used for detection of these narcotics.
Food plants suitable for mass rearing of the coconut hispine beetle Brontispa longissima
Yamashita, Ai ; Winotai, Amporn ; Nakamura, Satoshi ; Takasu, Keiji ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 57~61
The invasive pest Brontispa longissima(Coleoptera: Chrysomelidae), native to Indonesia and Papua New Guinea, has extended its distribution to Australia, Asia and Pacific islands and caused serious leaf damages of the coconut palm Cocos nuciferain the invaded regions. Although biological control using parasitic wasps has successfully reduced population density and leaf damage levels, this pest and its natural enemies have not been efficiently producedin conventional methods using young leaves of C. nucifera. In the present study, we examined suitability of plants easily available in Thailand and Japan for mass rearing of this pest to develop effective mass rearing system of this pest. Mature, green leaves of the palms were also suitable for immature development and adult reproduction of this pest. Since mature leaves of C. nucifera are more abundant and less contaminated with fungus than the unopened leaf buds, mature leaves could be a promising plant diet for mass rearing of B. longissima. Ornamental palms such as Hyophorbe lagenicaulis and Washingtonia filifera were also suitable for immature development and reproduction of B. longissima. Away from palms, the cattail Typha spp. can sustain immature development and adult reproduction of B. longissima. In the area where C. nucifera is rare or not available, W. filifera or Typha spp. would be good food plants for mass rearing of this pest.
Studies on the Feed Value of Yukmijihwangtang Meal
Cha, Sang-Woo ; Choi, Hyun-Soo ; Kim, E-Soo ; Jung, Kang-Seok ; Jang, Won-Seop ; Shin, Yong-Joon ; Lee, Soo-Kee ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 63~71
Two experiments were conducted to investigate feed value of Yukmijihwangtang (herbal medicine) meal. In experiment 1, the chemical composition of Yukmijihwangtang ingredients was determined before and after extraction, and investigated the effects of partial substitution of dried Yukmijihwangtang meal on TMR for fattening cattle. In experiment 2, nine Korean native male goats were employed to investigate the palatability and ruminal parameters of Yukmijihwangtang meal silages. In experiment 1, the crude protein content after water extraction was higher in Alisma orientale Juzepczuk (Teaksa), and lower in Pachyma hoelen Rumph (Bokryeong). the crude fat content after water extraction was higher in Cornus officinalis Sieb. et Zucc (Sansuyu), and lower in other ingredients. ADF content after water extraction of Cornus officinalis Sieb. et Zucc (Sansuyu) was higher compared to those of Pachyma hoelen Rumph (Bokryeong) and Paeonia suffruticosa Andrews (Mokdanpi). Dioscorea japonica Thunberg (Sanyak) was the lowest in ADF content. Dry matter disappearance was increased by adding Yukmijihwangtang meal to TMR. In experiment 2, feed intakes of Yukmijihwangtang silage containing molasses (0.5 and 1%) for 30 min and 6 hr were significantly higher than that of control (0%) in Korean native goats. In various ruminl parameters, molasses addition to silage materials trended to increase total VFA, propionate and valerate contents, but trended to decrease iso-butylate, butylate and iso-valerate contents in Korean native goats. In conclusion, Yukmijihwangtang meal could be used as partial substitution of low level in TMR for fattening cattle. Molasses supplementation to silage materials contained with herbal medicine meal could improve its nutritional quality and palatability for Korean native goats. One percent level of molasses addition could give a useful effect in ensiling.
Actual State of Structures and Environmental Control Facilities for Tomato Greenhouses in Chungnam Region
Nam, Sang-Woon ; Kim, Young-Shik ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 73~85
An investigation was conducted to get the basic data for establishing structural safety and environmental management of tomato greenhouses in Chungnam region. The contents of the investigation consisted of actual state of greenhouse structures and environmental control facilities. Most of greenhouses were arch type single-span plastic houses and they had too low height for growing tomatoes. Frameworks of multi-span greenhouses were suitable, but those of single-span were mostly insufficient. Every greenhouse had thermal curtain movable or covering fixed inside the greenhouse for energy saving, and heating facilities were mostly warm air heater. Irrigation facilities were mostly drip tube and controlled by manual operation or timer. Almost all of the greenhouses didn't install high level of environmental control facilities such as ventilator, air circulation fan,
fertilizer, insect screen, supplemental light, and cooling device.
Planning for Securing Instreamflow of Gapcheon Stream in Daejeon
Noh, Jae-Kyoung ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 87~98
The objective of this study is to evaluate the effect of increasing instream flow at Gapcheon stream of Daejeon city by considering two virtual reservoirs upstream, respectively; Geum-gok reservoir and Koe-gok reservoir upstream, respectively. The paralleled and cascaded reservoir operations were performed including the existing Jang-an and Bang-dong reservoirs. The results are summarized as follows. Firstly, from the Bang-dong and Geum-gok cascaded reservoir's water balance analysis, instream flow of
was able to be supplied to downstream, and water supply indexes of Geum-gok reservoir were analyzed to have the rate of water supply divided by watershed area of 403.4 mm, the rate of water supply divided by rainfall of 33.0 %, the rate of water supply divided by inflow of 96.4 %, the rate of water supply divided by storage capacity of 81.9 %, and the rate of inflow divided by storage capacity of 112.3 %. Secondly, from the Jang-an and Geum-gok paralleled reservoir's water balance analysis, flow durations at Gapcheon station were analyzed to have Q95 (the 95th high flow) of
, Q185 (the 185th high flow) of
, Q275 (the 275th high flow) of
, and Q355 (the 355th high flow) of
. Thirdly, inflow to Koe-gok reservoir was simulated including the Jang-an and Bang-dong paralleled reservoir's water balance analysis, instream flow of
was able to be supplied from Koe-gok reservoir to downstream, and water supply indexes of Koe-gok reservoir were analyzed to have the rate of water supply divided by watershed area of 246.5 mm, the rate of water supply divided by rainfall of 19.4 %, the rate of water supply divided by inflow of 40.8 %, the rate of water supply divided by storage capacity of 412.1 %, and the rate of inflow divided by storage capacity of 1,189.8 %. Fourthly, daily streamflows at Gapcheon stream were simulated including outflows from Koe-gok reservoir, flow durations at Gapcheon station were analyzed to have Q95 (the 95th high flow) of
, Q185 (the 185th high flow) of
, Q275 (the 275th high flow) of
, and Q355 (the 355th high flow) of
. The conclusion appeared that the effect of increasing instream flow at Gapcheon stream from Koe-gok reservoir was more higher than that from Geum-gok reservoir.
Increasing Instream flow in Nonsancheon by Water Storage Securing Scenario of Upstream Reservoirs
Noh, Jae-Kyoung ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 99~109
This study was performed to evaluate the effect of increasing instream flow at Nonsancheon stream of Nonsan city by securing water storages in upstream reservoirs; Ge-ryong, Gyoung-cheon, Dae-dun, and Tab-jeong. The paralleled and cascaded upstream reservoir operations for 8 storage securing scenarios were considered to simulate daily streamflows at Nonsan station. Using Tab-jeong reservoir water storage, the DAWAST model's parameters were determined, and the verified result showed Nash-Schcliffe's coefficient of 0.666. Instream flows were analyzed to supply maximum
on an annually average from upstream reservoir storage securing scenarios. The storage securing set of 2 m heightened Ge-ryong, 5 m Dae-dun, and 1 m Tab-jeong showed that the additional secured water storages were
and instream flow at Nonsan station was increased to
, 2 times of present condition.
Purification and Some Properties of Fibrinolytic Enzyme from Typha angustata Pollen
Park, Hae-Min ; Gu, Ja-Hyeong ; Oh, Man-Jin ;
Korean Journal of Agricultural Science, volume 36, issue 1, 2009, Pages 111~122
When the cattail pollen was identified by using fibrinolytic agents, we found that the fibrinolytic activity was controlled by an enzyme. Therefore, for determining the fibrinolytic activity of cattail pollen, the fibrinolytic enzyme in cattail pollen was purified by gel filtration using DEAE-cellulose, Sephadex G-150 and HPLC. Also, its purity was certified by polyacrylamide gel electrophoresis, and its physico-chemical properties, such as pH and temperature stabilities and effects of metal, inhibitors and substrates, were examined. The specific activity, purification fold, and molecular weight of the enzyme were 38U/mg, 86.4,and 75kDa, respectively. The optimum pH for the purified enzyme was at 4.0 and it was stable at pH 4.0-6.0. The optimum temperature was
and it was stable at
. But the enzyme began to be inactivated at
and its activity was totally lost at temperatures above
. As for substrate specificity, the enzyme was most effective in dissolving fibrin, followed by whole casein,
-casein, and BSA. With casein as the substrate, Km value was found to be 0.44mM and the enzyme showed a high affinity for casein. As for the metal ions affecting enzyme activity,
had no effect on enzyme reaction while
showed potent inhibitory activity. Judging from the fact that the purified enzyme was also strongly inhibited by PMSF, iodoacetic acid, and SDA, it assumed to be a serine protease.