• Korean Journal of Food Science and Technology
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• v.13 no.4
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• pp.299-306
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• 1981

Contents of heavy metals in fruits and vegetables collected from Jinju district of Korea during June 1980 to March 1981 were determined. Statistical analysis of the data showed the maximum, minimum, mean and standard deviation for each variable. The ranges of their amounts in fruits and vegetables were lead, $trace{\sim}0.829\;ppm\;;mercury,\:ND{\sim}0.368\;ppm;cadmium,\;ND{\sim}0.264\;ppm;\;arsenic,\;trace{\sim}1.289\;ppm;\;copper,0.200{\sim}3.759\;ppm;\;zinc,\;0.327{\sim}21.663\;ppm;\; manganese,\;0.828{\sim}22.413\;ppm;\;iron,\;0.201{\sim}32.425 ppm,$ respectively and the content of chromium was in trace for 4 samples.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.7
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• pp.1273-1284
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• 2000

In this study, ultrafiltration was performed to remove humic acid from aqueous solution. Since the effects of system variables on the ultrafiltration were tangled with non-linearly. Response Surface Methodology(RSM) was used to know optimum conditions of ultrafiltration process, relations among system variables, and the effects of system variables such as pressure difference across the membrane, concentration of humic acid, and feed flow rates. As concentrations of humic acid were 10ppm, 40ppm, and 70ppm in feed stream, permeation fluxes were 2.56, 2.27, and $2.10({\times}10^{-2}cc/cm^2{\cdot}min)$ respectively ; in other words, permeation fluxes of 10ppm, 40ppm and 70ppm feed concentration decreased by 17.7%, 26.7% and 32.2% of pure water permeation flux respectively. Concentration of humic acid in permeate side were 0.5ppm, 1.2 ppm, and 2.1ppm respectively. When pressure difference(${\Delta}P$) increased from 1atm to 2atm and 3atm, permeation fluxes of 40ppm feed concentration increased by 66% and 152% of permeation rate at 1atm respectively. However, concentrations of humic acid in permeate side increased from 0.5ppm to 1.5ppm and 3.5ppm. RSM showed that the optimum condition of system variables is 38.5~40ppm of humic acid concentration in feed stream, 30~30.7cc/min of feed flow rate, and 2atm of pressure difference.

• Journal of Aquaculture
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• v.8 no.3
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• pp.183-193
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• 1995

Blue tilapia, Oreochromis aureus swim-up fry were fed,0, 1, 10, or 60 ppm $17\alpha-methyltestosterone$(MT) for 30 days (sex reversal period). Fish that had been fed 0 ppm MT during the sex reversal period were subsequently fed 0 ppm MT (0-0), 10 ppm MT (0-10) or 60 ppm MT (0-60) for the next 57 days (post sex reversal period) ; fish that had been fed 60 ppm MT during the sex reversal period were subsequently fed 0 ppm MT (60-0), 10 ppm MT (60-10), or 60 ppm MT (60-60) during the post sex reversal period. One group was fed 1 ppm MT (1-1), while another group was fed 10 ppm MT (10-10) during the entire 87-day experiment. There was a significant inverse relationship between concentration of MT and percentage body protein and percentage body fat at the end of the sex reversal period, while there was a significant positive relationship between concentration of MT and percentage body moisture. MT treatment during the post sex reversal period had greater effects on body composition of males at the end of the post sex reversal period than did MT treatment during the sex reversal period. There was a significant inverse relationship between MT concentrations, during both the sex reversal and post sex reversal periods, and gonosomatic indices (GSI) in males. In females, there was a significant inverse relationship between MT concentrations during the post sex reversal period and GSI.

• Journal of Mushroom
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• v.3 no.3
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• pp.95-99
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• 2005

Carbon dioxide($CO_2$) promotes development of primordia and depress differentiation of sporophore and gill containing basidia, have an effect on quality. This experiments were conducted to elucidate optimal level of $CO_2$ for king oyster mushroom(Pleurotus eryngii). King oyster mushroom was cultivated under 1,600, 2,400, and 3,200ppm $CO_2$. Harvest ratio in normal plot were 98.6, 99.3, and 93.8% at 1,600, 2,400, 3,200ppm, respectively, so 2,400ppm is optimal. The yield per bottle was 102.5g at 2,400ppm, better than 99.7g at 1,600ppm, The $CO_2$ concentration of 2,400ppm was also the best condition for quality, 6.1 at 2,400ppm was 115% of 1,600ppm's. In thinning treatment plot, quality at 2,400ppm was 9.5 better than 1,600ppm whose quality was 9.4. The yields per bottle were 90.7, 98.2, 77.3g at 1,600, 2,400, 3,200ppm respectively. These results show that 2,400ppm was optimal $CO_2$ concentration for quantity of King Oyster mushroom as well as quality.

• Korean Journal of Environmental Agriculture
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• v.12 no.3
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• pp.239-246
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• 1993

In order to clarify the possible contamination of rice straw used as a crude feed for livestock, Korean native cattle and cow, by pesticides, the samples collected from 21 sites in Korea were analyzed by a multiresidue method for 10 pesticides with GLC to obtain the following results. 1. Detection limits were 0.001ppm in butachlor, 0.002ppm in chlorpyrifos, 0.003ppm in BPMC, pirimiphos-methyl and diazinon, 0.004ppm in fenitrothion, 0.005ppm in phenthoate, 0.009ppm in IBP, 0.015ppm in carbofuran, and 0.03ppm in carbaryl. 2. In recovery tests, 73-101% of the pesticides applied were recovered, the recovery being low in carbofuran and chlorpyrifos. 3. Butachlor, 2-chloroacetanilide herbicide, and BPMC, carbaryl, and carbofuran, carbamate insecticides, were not detected in any sample. 4. In organophosphorus insecticides, the amounts of fenitrothion in sample No. 1, 2, 4, 5, 7, 12, 20 and 21 were in the range of 0.01-0.05ppm, those of phenthoate detected in sample No. 10 and 12 were 0.4 and 0.17ppm, respectively, and those of IBP in all samples, with the exception of sample No. 7, 12, 16, 17, 20, and 21, were in the range of 0.01-0.20ppm. The residues of chlorpyrifos, diazinon, and pirimiphos-methyl were not detected.

• Journal of Food Hygiene and Safety
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• v.2 no.1
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• pp.3-8
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• 1987

ABSTRACT-Agricultural products collected from the suburbs of Chuncheon in 1984 were analyzed for carbamate pesticides by GLC-NPD. O-tert-butyl phenyl methyl carbamate(BPMC) was detected in most samples and their residue levels in strawberry, tomato, cucumber, grape, apple and chinese cabbage were in the range of non-detectable to 0.2356 ppm(Av. 0.0539 ppm). 1- naphthyl methyl carbamate(N AC) were detected in cucumber, grape and chinese cabbage and their residue levels were in the range of non-detectable to 0.0265 ppm. O-cumeryl methyl carbamate(MIPC) was detected in only chinese cabbage and its residue levels were in the range of non-detectable to 0.0059 ppm. Detection frequencies of BPMC, MIPC and NAC in the chinese cabbage were higher than those the others.others.

• Journal of Korean Society for Quality Management
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• v.28 no.4
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• pp.184-193
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• 2000

Single-PPM Quality Movement is perfect production movement which is suitable for 21C's social-economical criteria to pursuit of zero defect. This is advanced program of 100PPM Quality Renovation Movement which has been started in 1995, for single unit ppm. In this paper, through the review of 100PPM Movement's performance and problem solving procedure, we hope to find and discuss that how is an effective and compatible approach to realize the single-ppm quality in the small-and-medium size enterprises.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.6
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• pp.1163-1166
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• 2002

Antimicrobial activity of silver ion was tested against 3 kinds of food-borne microorganisms-Salmonella typhimurium, Staphylococcus aureus and Vibrio parahaemolyticus-using paper disk and broth medium methods. In paper disk method, silver ion showed antimicrobial activity against S. typhimurium and V. parahaemolyticus at the concentration above 2 ppm and 10 ppm, respectively, where as it was not detected in S. aureus with 20 ppm of silver ion concentration. In broth medium, the growth of S. typhimurium and V. Porahaemolyticus could be retarded at 0.3 ppm and 0.5 ppm of silver ion concentration respectively. In the presence of 1.0 ppm of silver ion, the growth of S. typhimurium was inhibited completely. In S. aureus, the growth was retarded at 5 ppm and was inhibited at l5 ppm completely.

• The Korean Journal of Pesticide Science
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• v.3 no.1
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• pp.78-83
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• 1999

Sublethal effects of imidacloprid (30 and 100 ppm) and insect growth regulators; flufenoxuron (3 and 10 ppm), triflumuron (10 ppm), and teflubenzuron (3 ppm), were tested by treatment via larval rearing medium of a housefly, Musca domestica, in laboratory. Pupal weight was significantly reduced by treatment to the 3rd larvae with high concentrations of imidacloprid (100 ppm) and flufenoxuron (10 ppm), and the adults that survived the flufenoxuron 10 ppm treatment deposited significantly fewer eggs compared with controls and other treatments. Adult longevity and egg viability, however, were not affected by any of the treatments.

• Journal of the Korea Organic Resources Recycling Association
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• v.8 no.2
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• pp.93-101
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• 2000

The objective of this study was to evaluate the possibility of co-digestion of food waste and sewage sludge mixture using anaerobic system. The Biochemical methane Potentials of cabbage and food waste were $297ml\;CH_4/g$ VS and $306.7ml\;CH_4/g$ VS, respectively. The biodegradability of food waste was 60%. The concentrations of acetate, propionate, and isobutyrate produced during the aerobic acidogenesis of food waste for 36 hours were 7,000~7,200 ppm, 260~280 ppm, 380~400 ppm, and 40~50 ppm, respectively, of which acetate was over 85%. The concentrations of acetate, propionate, and isobutyrate produced during the anaerobic acidogenesis for 36 hours were 1,400~1,600 ppm, 30~40 ppm, 220~250 ppm, and 260~300 ppm, respectively, of which acetate was over 70%. The biodegradabilities of aerobic and anaerobic acidogenesis were 30% and 25%, respectively. Methanogensis could be activated under 1 % of NaCl and 1,000 ppm of volatile fatty acids at the range of pH 6.8~7.2. The maximum mixture ratio of food waste and sewage sludge in the present study was 2:8 by the result of VS removal rate and Methane production.