• Korean Journal of Food Science and Technology
• /
• v.36 no.6
• /
• pp.968-973
• /
• 2004

Effects of Erythronium japonicum methanol extract on ICR mouse with induced abdominal cancer and L1210 cells were studied. Administration of methanol extract ($10-100\;{\mu}g/20\;g$ body weight) prolonged life by 47.8% and decreased number of L1210 cells with $IC_{50}\;of\;54.6\;{\mu}g/mL$ after 3 days culture, whereas little effect was observed against normal lymphocytes (<6% compared to 83.2% of L1210 cells under the same condition). Increased SOD and GPx enzyme activities, and remarkably augmented generation of ${O_2}^-$ ion in L1210 cells by E. japonicum extract, implied that reactive oxygen species including ${O_2}^-$ ion, might have participated in L1210 cell death

• Korean journal of food and cookery science
• /
• v.31 no.4
• /
• pp.505-509
• /
• 2015

Light emitting diodes (LED) are able to selectively control the wavelength of light, enabling them to enhance photosynthesis by increasing specific wavelengths. The objectives of this study were to determine the effects of LED light exposure with various wavelengths (630 nm: 550 nm: 450 nm=8:1:1) on plant growth and bio-active compound concentrations in cherry tomato and red cabbage. With cherry tomatoes, LED decreased the number of fruits compared to fluorescent light (FL) but resulted in a significantly higher value in the total weight of the fruits and in sugar content. However, lycopene contents were not significantly different between the groups. With red cabbages, the weight and length were both significantly higher in the LED group than in the FL group. Furthermore, the anthocyanin contents in the red cabbage LED group were two times higher than those of the FL group. These results suggested that exposure to LED light with a high ratio of red wavelength can increase the anthocyanins contents in red cabbages but not the lycopene content in cherry tomatoes. Further studies will be needed to determine which LED wavelength can enhance lycopene content in cherry tomatoes.

• Korean Journal of Environmental Agriculture
• /
• v.27 no.4
• /
• pp.337-342
• /
• 2008

The nitrogen (N) and phosphorus (P) balances in Korea during 1985-2006, which calculated according to the surface balance method of the PARCOM guidelines, continually increased with the lapse of year, and then might keep the highest levels with about $250kg\;N\;ha^{-1}$ and $50kg\;P\;ha^{-1}$ in 2006 among OECD countries. National phosphorus balance of the developed OECD countries (Belgium, Denmark, Germany, The Netherlands) in the livestock feeding industries has significantly decreased, due to limit livestock feeding density and nutrient application level by using strong legislation. However, Korean P balance was not apparent decrease, since the number of livestock feeding heads has been increasing, irrespective with the decrease of chemical fertilizer consumption. Manure P portion to the total P input amount of the above four OECD Countries in nutrient balance has continuously inclined to 60-70%. Therefore, the large portion of livestock manure might be used as nutrient source in agricultural side in these countries. In particular, manure P application levels of Belgium and The Netherlands, which have relatively high P balance and manure P portion to total P input dose, was estimated to be $31-33\;kg\;p\;ha^{-1}$ in 2004, and it was similar level with that of Korea in 2006. The manure P application levels for agricultural purpose has continuously decreased in these two OECD countries. In contrast, our manure P application rate continuously increased, and therefore we need the strong political countermeasure to control livestock feeding density at the resonable level.

• Korean Journal of Plant Tissue Culture
• /
• v.26 no.2
• /
• pp.137-142
• /
• 1999

This study was carried out to investigate the effects of bulb size, type of media, depth of planting, and nutrient compositions on sprouting and growth of tissue cultured garlic microbulbs in hydroponic culture. Early and increased sprouting were observed when the microbulbs were transplanted into soil planted in shallow (1 cm in depth), while bulb size and fresh weight of the whole plant increased in deep planting (3 cm in depth). Bulb size have greatly influenced on not only sprouting rate but also plant growth after planting. Large bulbs resulted in high growth rate such as number of leaves, stem width, plant height, and increase in bulb size after planting. It was shown that Oriental nutrient solution (N=0.17, P=0.45, K=1.29, Ca=2.44, and Mg=0.98 me/L) was more effective in sprouting and further growth of microbulbs as compared to Yamazaki solution (N=0.27, P=0.16, K=1.50, Ca=1.36 and Mg=0.78 me/L). Microbulbs grown in mixture of leaf mould + bark + sand or Baroko showed the most vigrous growth.

• Korean journal of applied entomology
• /
• v.53 no.1
• /
• pp.85-91
• /
• 2014

In this study, we analyzed the phylogenetic characterization of root-knot nematodes (Meloidogyne spp.) in soils from fruits and vegetables greenhouses in Korea. Soil samples were collected from 12 greenhouse fields in which tomato, cucumber, watermelon, and Oriental melon were being cultivated. Meloidogyne spp. were detected in all the soil samples at an average number of $72{\pm}6$ nematodes/300 g of soil to $2,898{\pm}468$ nematodes/300 g of soil. Phylogenetic analysis using polymerase chain reaction-restriction fragment length polymorphism was attempted for the second-stage juveniles (J2) of Meloidogyne spp. collected from the greenhouse soils. Twelve Meloidogyne spp. from the greenhouse soils were classified into two groups by using HinfI digestion of mitochondrial DNA, resulting in 900, 410, 290, and 170 bp fragments (group A) and 900, 700, and 170 bp fragments (group B). Phylogenetic analysis based on mitochondrial DNA sequences (1,483-1,521 bp) showed that nine group A isolates were identified as Meloidogyne incognita (99.73-99.93%) and three group B isolates showed 99.54-99.73% similarity to Meloidogyne arenaria.

• Korean journal of applied entomology
• /
• v.55 no.4
• /
• pp.389-403
• /
• 2016

Sugar beet nematode (Heterodera schachtii Schmidt) was first detected in 2011, in Chinese cabbage grown in the highland areas of Korea. Chemical control of the nematode by nematicides is not feasible due to its cyst-forming characteristics; therefore, the cultivation of non-host crops is a preferable alternative to utilize nematode-infected fields. In this study, a total of 276 plant cultivars belonging to 18 different families were screened to evaluate their resistance to the nematode. Based on the number of cysts formed following nematode inoculation, the tested crops were classified into 3 levels: susceptible, moderately susceptible, and resistant/immune. Among the 276 cultivars tested, 106 cultivars were susceptible, 40 cultivars were moderately susceptible, and 130 cultivars were resistant/immune. Among the resistant/immune cultivars, cyst formation was not observed on eggplant, tomato, lettuce, perilla, carrot, celery, watermelon, oriental melon, cucumber, pumpkin, chives, onion, welsh onion, balloon flower roots, deodeok (Codonopsis lanceolata), Jandae (Adenophora triphylla), and bean. Therefore, these plants are regarded as immune to the cyst nematode. However, many crops belonging to Solanaceae, Asteraceae, Chenopodiaceae, and Poaceae families showed moderate susceptibility or immunity, depending on the crop or cultivar. This study provides a basis for alternative crop recommendations for sugar beet nematode cyst-infected farms in Chinese cabbage production areas.

• Journal of agricultural medicine and community health
• /
• v.19 no.1
• /
• pp.31-39
• /
• 1994

We carried out this study by analyzing the annual reports, surveyed by medical college student(Ewha Woman's University) through the medical records of new patients of Su-Dong Myon Health Subcenter from 1982 to 1992, and the specific survey data of 247 in Su-Dong Myon area which consists of 5,454 population and 1,651 household(43.6% farm household), in December, 1993. Results were as follows: 1) The number of population in Su-Dong Myon is 5,265 in 1982, 4,905 in 1984, 4,885 in 1986, 4,820 in 1988, 4,663 in 1990, 5,454 in 1992. 2) Since 1982, the annual utilization rate of a rural health subcenter showed decreasing tendency: such as 609(the highest rate) per 1,000 inhabitants in 1982, 485 in 1984, 525 in 1985, 281 in 1988, 316 in 1990 and 197 in 1992. The utilization rate by sex was decreasing chronologically in male, and age-specific utilization rate showed rapidly decreasing tendency since 1982 : 1,037 per 1,000 inhabitants in 1982, 877 in 1984, 1,084 in 1986, 519 in 1988, 538 in 1990 and 333 in 1992, in age group of 0-14, but not changing tendency in age-groups of 65 and over. 3) The monthly utilization rate of a rural health subcenter showed increasing tendency in March, July and August from 1982 to 1987, and in March and May from 1988 to 1992. 4) The patient rate of medical insurance showed increasing tendency since 1983: 17.0% per 100 patients(the lowest rate) in 1983, 21.3% in 1985, 20.4% in 1987, 70,0% in 1989 and 77.8% in 1991. However, the patient rate of Medicaid showed no specific change. 5) The utilization rate by the remedial measures for primary health care showed 30.8% of the answered in private special clinic, the highest rate, and 30.0% in drug stores, 25.5% in health subcenter, 10.5% in hospital and 1.2% in oriental clinic. In favorite physicians for primary health care, specialist was the highest rate, 48.6% of the answered, and general practitioner, 39.7% and home doctor, 8.9% in next order. And 70.8% of the answered experienced to visit the health subcenter more than once. 6) Disfavorite reasons of health subcenter were insufficient equipment(42.1%, the highest), and the next order, short cure time per day(25.1%), "be not cured"(12.2%), "be not(6.9%) and unkindness(3.6%), And the major obstacles in utilizing the medical facilities for primary health care were farm works(41.7%, the highest), distance(27.1%) and medical cost(11.4%).

• Food Science and Preservation
• /
• v.13 no.2
• /
• pp.223-227
• /
• 2006

Optimal heat treatment conditions for maintaining the immune-activity of immunized milk with Helicobacter pylori antigen were studied Total bacterial count of immunized milk with H. pylori antigen decreased according to the increasing heating temperature and time. The viable tell number of immunized milk was $10^3\;CFU/mL$ after heat treatment for 30 min at $60^{\circ}C$, and coliform bacteria did not appear in immunized milk after heat treatment Immune-activity measured in terms of IgG concentration was maintained up to 99.99% after heat treatment for 30min at $60^{\circ}C$, but decreased rapidly below 50% after heat treatment above $70^{\circ}C$. The quality characteristics of immunized milk were examined during storage at $2^{\circ}C,\;4^{\circ}C\;and\;10^{\circ}C$. The pH, titratable acidity and total bacterial count were not changed significantly during 21 day storage at $2^{\circ}C\;and\;4^{\circ}C$, but rapidly changed after 7 day storage at $10^{\circ}C$. The immune-activity was kept well for 14 day storage at $2^{\circ}C,\;4^{\circ}C\;and\;10^{\circ}C$ but decreased rapidly after 14 days at every temperatures tested.

• Korean journal of applied entomology
• /
• v.49 no.4
• /
• pp.393-400
• /
• 2010

The parasitism, development time, hatchability, and progeny production of Trichogramma chilonis(TC) females developed in eggs of Helicoverpa assulta (HAs), Cadra cautella (CC), and Helicoverpa armigera (HAr), respectively, were compared with those developed in reciprocal eggs at constant temperatures of $25{\pm}2^{\circ}C$ and relative humidity of 50~70% under 16L-8D. Developmental performances of TC reared in each of the three hosts on the following hosts(host tested) appeared differently, and were affected most by the size of the proceeding hosts and test host. Among the parameters parasitism and progeny production were affected more than others. Parasitism was significantly different between the treatments, lowest in CC-HAr($10.1{\pm}2.05%$) and highest in HAr-HAs($47.0{\pm}2.09%$), and the hatchability showed similar pattern. Development time as well was shortest in the CC-HAr where previous host is smallest and test host is biggest. The highest number of progeny production of TC was observed in HAr-HAs($93.9{\pm}6.87$ wasps), and the lowest was CC-HAs($18.4{\pm}6.36$ wasps).

• The Korean Journal of Soil Zoology
• /
• v.5 no.1
• /
• pp.21-32
• /
• 2000

A faunistic study on the spiders (Arachnida: Araneae) from Mt. Jumbong Kangwon-do was carried out from 1996 to 1999. During the survey period, 144 species of 88 genera belonging to 27 families including 5 undetermined species were identified from 900 collecting individuals. The dominant families were Linyphiidae 21 species; 14.6% of total species), Araneidae (20 species, 13.9%), Theridiidae (16 species, 11.1%), and Salticidae 12 species, 8.3%). The composition of the species of web builders was richer than that of hunters. As for species commonness with adjacent countries, the numbers of common species between Mt. Jumbong and Japan, Mt. Jumbong and China, and Mt. Jumbong and Russia were 15 species (80.4%), 98 species (68.5%), and 48 species (33.6%), respectively. The number of common species among these four regions were 39 species (27.3%). So, the spider species composition in Mt. Jumbong seemed being much similar to those in neighbor countries. An outline of biogeographical distribution of spiders can be summarized as 1 Cosmopolitan species (0.7%), 16 Palearctic species (11.2%), 7 Holarctic species (4.9%), 25 Korean endemic species (17.4%) and no Oriental species. In the spider fauna at Mt. Jumbong, therefore, there are high level of occurrence of Korean endemic species with northern spiders as Palearctic and Holarctic species. The level and direction of man-made development may have negative effect on regional biota.