• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.3 no.1
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• pp.31-37
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• 2010

This paper proposes a novel method for pilot-aided integer frequency offset (IFO) estimation in orthogonal frequency division multiplexing (OFDM)-based digital video broadcasting-terrestrial (DVB-T) systems. The conventional method proposed for estimating the IFO uses only partial information of combinations that pilots can provide, which stems from a rigorous assumption that the channel responses of pilots used for estimating the IFO change very rapidly. In this paper, we propose an efficient IFO estimation method exploiting additional information of combinations that pilots can provide to improve the performance of the IFO estimation. The simulation results show that the proposed method outperforms the conventional method in terms of the IFO detection probability.

• Microbiology and Biotechnology Letters
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• v.13 no.3
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• pp.179-184
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• 1985

Sexually compatible heterothallic haploids and diploids therefrom of Saccharomycopsis lipolytica were compared with respect to production. Diploids constructed through mating were confirmed by random spore analysis, whereas those constructed through protoplast fusion were confirmed by haploidization. ATCC 44601 and IFO 1209 produced larger amount of citrate and isocitrate than IFO 1550 and IFO 1551. A mode of citrate production by diploids was intermediate of the parental haploid strains. The specific activities of citrate synthase and isocitrate lyase in IFO 1550 and IFO 1551 were higher than those in ATCC 44601 and IFO 1209, indicating little correlation between citrate production and specific activities of these enzymes.

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.1
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• pp.87-91
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• 1997

A method for lab scale production and isolation of chitosan from mycelia of Cunninghamella blakesleeana IFO 4443 mutant was developed. Mutant of Cunninghamella blakesleeana IFO 4443-10 obtained by W radiation was cultivated in 5L jar fermentor at 3$0^{\circ}C$ for 3days. The fungus were grown well at pH 4.5 Chitosan was readily extracted from mycelia walls with alkali treatment. The maximum yield of chitosan obtained was 1012mg/L and degree of deacetylation was 84.6%.

• Textile Coloration and Finishing
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• v.12 no.1
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• pp.32-43
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• 2000

Batch culture system and continuous culture systems were used to investigate the removal of disperse dye using white rot fungi. White rot fungi used in the study were Coriolus hirsutus IFO 4917, Lenzites betulina IFO 6266, Coriolus versicolor IFO 30340 and Phanerochaete chrysosporium IFO 31249. The results of the batch culture experiment showed that white rot fungi used in this study had excellent dye removal abilities. Phnerochete chrysosporium IFO 31249 was especially effective on the removal of disperse dyes. And continuous treatment of disperse red 60 was studied under two type of reactor using Phanerochaete chrysosporium IFO 31249. The removal efficiency of disperse red 60 for immobilized Phanerochaete chrysosporium IFO 31249 in continuous reactor with vertical matrix was increased 1.3 fold in $1.4\;hr^{-1}$ dilution rate when compared with continuous reactor without vertical matrix.

• Korean Journal of Food Science and Technology
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• v.23 no.3
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• pp.291-295
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• 1991

In order to obtain the highest productivity of polysaccharide, acetic acid bacteria was used. Several acetic acid bacteria were investigated to the productivity of polysaccharide, an mutant, Acetobacter pasteurianus IFO 13751-5 selected among serveral acetic acid bacteria which can produce the polysaccharide by radiation of ultra-violet ray. Acetobacter pasteurianus IFO 13751-5 was shown 3 fold polysaccharide production than that of its parents. When the Acetobacter pasteurianus IFO 13751-5 was investigated under the condition of carbon source containing 5% sucrose, the highest amount of polysaccharide (45.95 mg/ml) was obtained. The polysaccharide production by Acetobacter pasteurianus IFO 13751-5 was 55.10 mg/ml by using jar fermentor.

• Korean Journal of Food Science and Technology
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• v.40 no.1
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• pp.76-81
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• 2008

Currently, natural food colorants and preservatives are being used for their general health benefits. Monascus koji, the product of certain fungi that grow on rice grains, has been added to many foods for coloring and preservation. In this study, the antimicrobial activities of Monascus koji ethanol extracts were investigated. Six Monascus strains (M. araneosus KFRI 00371, M. kaoliang ATCC 46597, M. pilosus IFO 4520, M. purpureus IFO 4482, M. ruber IFO 32318 and M. sp. ATCC 16437) were selected based on their relative intensity of red pigment. Two Monascus extracts, M. kaoliang ATCC 46597 and M. purpureus IFO 4482, displayed antimicrobial activities against Bacillus subtilis, B. cereus, Micrococcus luteus, Staphylococcus aureus and Salmonella typhimurium in concentration-dependent manners. The two extracts showed their strongest antimicrobial activity against S. typhimurium, a cause of food poisoning. Therefore, these results suggest that Monascus koji could be used as a natural food colorant and preservative.

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.402-405
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• 2000

Batch culture system and continuous culture system were used to investigate the removal of disperse dye using several white rot fungi. White rot fungi used in the study were Coriolus hirsutus IFO 4917, Lenzites betulina IFO 6266, Coriolus versicolor IFO 30340 and Phanerochaete chrysosporium IFO 31249. The results of the batch culture experiment showed that white rot fungi used in this study had excellent dye removal abilities. Phanerochaete chrysosporium IFO 31249 was especially effective on the removal of disperse dyes. And continuous treatment of disperse red-60 was studied under bioreactor with vertical matrix using Phanerochaete chrysosporium IFO 31249. The removal efficiency of disperse red-60 were more than 95% in 0.20 ${\sim} 1.50 $hr^{-1}$ dilution rate and 90% in $1.83h^{-1}$ dilution rate.

• Asian-Australasian Journal of Animal Sciences
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• v.19 no.6
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• pp.806-810
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• 2006

Candida utilis can assimilate fatty acids, so it was hypothesized that the treatment of rice by Candida utilis would improve feed quality by reducing fat content and adding the yeast function that would stimulate rumen microbes. In this study, the oil assimilation ability of Candida utilis IFO1086, 0988, 0626 and the effect of treatment of Candida utilis IFO1086, IFO0626 on the nutrient contents of rice bran were examined. The effect of Candida utilis addition on the in vitro degradability of forage was also investigated. It was found that the oil assimilating ability of IFO1086 and IFO0626 was significantly (p<0.01) higher than that of IFO0988. Candida utilis treatment reduced the EE content and increased the CP, ADF and NDF percentage. The absolute amount of ether extract was decreased by 35.9% in IFO1086 and IFO0626 treatment. The absolute amount of crude protein was not changed by yeast treatment. The ADF and NDF amounts were increased. The addition of Candida utilis increased in vitro forage degradability significantly (p<0.05). Based on these results it can be postulated that treatment of rice bran by Candida utilis may improve feed quality by reducing fat content, increasing the CP content and adding the function of yeast for stimulating rumen microbes.

• Journal of the Korean Chemical Society
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• v.39 no.9
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• pp.749-754
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• 1995

The synthetic procedures to synthesize polymethacryloylsulfadiazine were searched by DCC method and Acid Chloride mothod. Polymeric drug was synthesized by Acid Chloride method in high yield (72%) but DCC method in low yield (23%). The antimicrobial activities of polymeric drug were investigated in terms of minimum inhibitory concentrations by the common two-fold dilution technique. Polymeric drug revealed an excellent antimicrobial Bacillus subtillis ATCC 6633, Mycrobacterium phlei IFO 3158, Micrococus luteus ATCC 9341, Salmonella typhimurium KCTC 1925, Klebsiella pneumoniae KCTC 1560 and similar activity against Staphylococcus aureus IFO 12732, Escherichia coli BE 1186, Escherichia coli AB 0111, Pseudomonas aeruginosa IFO 13130. Polymeric drug have no antimicrobial activity against Candida albicans IFO 1594.

• The Korean Journal of Food And Nutrition
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• v.15 no.4
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• pp.364-369
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• 2002

Streptomyces shows a eukaryotic characteristic that vegetative cell can grow into mycelial form and has morphological and physiological differentiation at a certain period during its life cycle. Streptomyces has been used for the production of many biologically active compounds, such as antibiotics and pronase. Production of second metabolites and differentiation of the vegetative cell share the certain period of its lift cycle. Therefore, second metabolites may affect the differentiation of the vegetative cell. One of the microbial hormone, called A-factor, regulates the production of second metabolites, sporulation and differentiation of the cells. Streptomyces griseus produces streptomycin as well as many different kinds of proteinase. As mentioned, period of proteinases production overlaps with the period of differentiation of the vegetative cells. Protease may play a important role for the differentiation of the cells. In this paper, function of the SGPD gene cloned from S. griseus IFO 13350 tested whether it affects for the differentiation of A-factor mutated S. griseus HH1 and S. griseus IFO13350. pWHM3 and pWHM3-sprD plasmid was transformed into S. griseus HH1 and S. griseus IFO13350. Chymotrypsin activity of the cultured medium of the transformants with pWHM3-sprD plasmid didn't show any change with that of the transformants with plasmid only. The transformants with pWHM3-sprD plasmid didn't show the increase of the production of actinorhodin as well as morphological change in S. griseus IFO 13350 and HH1, as well. The promoter sequences of the SGPA and SGPB gene which encode chymotrypsin-like protease, were compared with that of SGPD gene. Regulatory mechanism of gene expression of proteinase genes will be studied for the development of high production system for protease as well as the function of the proteases.