• The Korean Journal of Food And Nutrition
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• v.37 no.1
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• pp.30-39
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• 2024

Black chestnut (BC) was obtained through aging of fresh chestnut (FC) at 80℃ for 15 days. Proximate and mineral compositions along with colors of FC and BC were evaluated. With aging, moisture contents decreased by 50%, whereas sugar contents, carbohydrate contents, and calories increased. Contents of minerals (Fe, P, Ca, Na, Mg, K) were significantly higher in FC than in BC, showing an order of Mg < Ca < P < K in both FC and BC. Using a Hunter color system, it was found that lightness (L), redness (a), and yellowness (b) values of FC were higher than those of BC. Antioxidant and cytotoxic activities of hot water and ethanol (50, 80, 100%) extracts prepared from FC and BC were evaluated. Extraction yields were lower with FC than with BC. Among water and ethanol extracts, water extract showed the highest DPPH radical scavenging activity for both FC and BC. IC₅₀ values for ABTS+ radical scavenging activities increased after aging. Cytotoxicities of FC and BC extracts were similar to each other. They were different against various cell lines (3T3, HeLa, and Sarcoma-180). These results suggest that BC could be used as a new processed food using chestnut.

• Korean Journal of Food Science and Technology
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• v.35 no.6
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• pp.1086-1092
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• 2003

This study was carried out to investigate the effectiveness of blanching on the different drying methods and to examine the quality properties of carrots dried by freeze., vacuum- or hot air-drying during storage. Blanched carrots (BC) dried faster than raw carrots (RC), while RC showed more effective rehydration than BC by hot air- and vacuum-drying methods. There was more stability for BC on carotene retention and browning degree than RC in all drying methods during storage. Moreover, firmness of RC and BC by vacuum-drying was slightly lower than that of hot air-drying, but higher than freeze-drying. In firmness, BC and RC showed similar trends with different drying methods (decreasing with increased storage periods), while BC showed about 3 time firmer texture than RC in all cases during storage. The dried carrots prepared with blanching treatment showed more fine structures than those not treated. These results showed that the blanching treatment of carrots was good for maintaining quality by various drying methods.

• Journal of The Korean Society of Grassland and Forage Science
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• v.17 no.4
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• pp.379-386
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• 1997

Recombinant plasmid, pBKH4, containing NPT II and P35S-BcHSP17.6 was constructed by ligation of Bum H I -digested pBKSl-l and BcHSP 17.6 (thermotolerance gene) 6om pBLH4. The tobacco leaf disc was cocultivated with transformed Agmbacterium tumefaciens bearing pBKH4 for 24 hours and transformed shoots were selected on MS-n/B medium containing $100\;{\mu\textrm{g}}/ml$ of kanamycin. Heat-killing temperature of Nicotima tabacum was $50^{\circ}$ for >15min, and transformed tobacco plants with BcHSP17.6 cDNA exhibited thermotolerance at the heat-killing temperature. The transgenic plants were analyzed by Southern blot hybridization with the probe of ${\alpha}^{_32}P$ labelled BcHSP17.6 cDNA. Transcription and expression level of BcHSP17.6 cDNA were also continued by Northern blot analysis and Ouchterlony double immunodiffusion assay. In this study, we suggest that the BcHSP17.6 cDNA introduced to tobacco plant is related to thenuoto-lerance and 17.6-kD LMW HSP acts as a protector from heat damage in plants.

• Journal of Life Science
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• v.23 no.3
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• pp.333-340
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• 2013

This study was performed to determine whether stem bark extract containing saponin of Albizzia julibrissin in the diet influences gonadal maturation and spawning in medaka (Oryzias latipes). The crude extraction containing saponin (HaBC) was partially purified from n-BuOH extraction of A. julibrissin stem bark by Diaion HP-20, Silica gel and Sephadex LH-20 chromatographies. We fed diets supplemented with HaBC to medaka. We then studied the effects of the HaBC supplement on the suppression of gonadal maturation and spawning in female medaka that were reared in aquaria with recirculation systems. In the experiment with immature female medaka, the periods of initiation of gonadal maturation and spawning were delayed in the fish that were fed diets supplemented with at least HaBC 20 mg/g-feed. In the experiment with mature female medaka, the fish that were fed diets supplemented with at least HaBC 20 mg/g-feed had lower GSIs than the control diet group did. The results showed that the growth of the immature medaka was not correlated with the amount of supplementation of HaBC in the diet. However, the condition factors (CF) in the medaka that were fed diets supplemented with at least HaBC 20 mg/g-feed were higher than in the medaka fed on the control diet. We concluded that extracts containing saponin from the stem bark of A. julibrissin have the potential to inhibit gonadal maturation in female medaka, but they did not act as growth stimulation. Further studies are required to determine the mechanism of the action.

• Korean Journal of Breeding Science
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• v.41 no.4
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• pp.463-467
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• 2009

Interspecific hybrid plants between Allium cepa L. (2n=2X=16) and A. fistulosum L. (2n=2X=16)and their backcross lines were developed by artificial pollination in order to introduce new desirable characters of A, cepa to A. fistulosum. The 2C nuclear DNA content has been estimated by flow cytometry in 5 Allium fistulosum inbreed lines, 2 interspecific hybrid lines of A. cepa${\times}$A. fistulosum and 34 their backcross lines $BC_1F_1$ to $BC_2F_2$, using propidium iodide (PI) as a fluorescence dye. Estimated 2C DNA values ranged from 22.2 pg to 23.7 pg in 5 A. fistulosum inbreed lines, 37.9 pg in F1 hybrid between A. cepa and A. fistulosum, 24.3 pg to 27.3 pg in 7 backcross lines in $BC_1F_1$, 21.9 pg to 24.4 pg in 9 $BC_1F_2$, 22.9 pg to 25.1 pg in 14 $BC_2F_1$, 22.6 pg to 23.4 pg in 4 $BC_2F_2$. This study showed mean 2C nuclear DNA content of $F_1$ hybrid was higher than their backcross progeny lines, while it was lower than female parental line, A. cepa (2C DNA=33.2 pg). Mean 2C DNA content of backcross lines, $BC_1F_1$ to $BC_2F_2$ was not significantly different but their 2C DNA contents in the more progress generation from $BC_1F_1$ to $BC_2F_2$ were reduced.

• Tribology and Lubricants
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• v.27 no.2
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• pp.65-70
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• 2011

The power servo cylinder for driving accurately turbine stop valve of an atomic power plant is necessary to do turn-over owing to a leakage of oil and a structure problem, especially, it of a power plant be in demand a high quality standard depends entirely on import. There are much problem that the AlBC be to used as a material of piston head in cylinder are caused by wear. Therefore, it is necessary to examine friction characteristics of it. In this study, wear test experiments was carried out with AlBC and SCM440, using reciprocating friction tester of pin on disk. This result was shown that the wear mechanism of AlBC on working condition is adhesive wear and the maximum temperature of infra redray thermal image of frictional surface show over 2 mm from contact surface of pin and disk.

• Biotechnology and Bioprocess Engineering:BBE
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• v.10 no.1
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• pp.1-8
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• 2005

Bacterial cellulose (BC), which is produced by some bacteria, has unique structural, functional, physical and chemical properties. Thus, the mass production of BC for industrial application has recently attracted considerable attention. To enhance BC production, two aspects have been considered, namely, the engineering and genetic viewpoints. The former includes the reactor design, nutrient selection, process control and optimization; and the latter the cloning of the BC synthesis gene, and the genetic modification of the speculated genes for higher BC production. In this review, recent advances in BC production from the two viewpoints mentioned above are described, mainly using the bacterium Gluconacetobacter xylinus.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.611-615
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• 2005

Having been multimedia services in BcN network, QoS is best important factor. This paper classify existing services and newly to be offered services, analyze quality criterion and measurement method for QoS guarantee in BcN, This paper investigate end-to-end quality criterion, classify measurement method existing and newly to be offered services, search quality criterion, introduce measurement method such as call success rate, packet loss rate, one-way delay, jitter and R-value for end-to-end quality measurement.

• Microbiology and Biotechnology Letters
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• v.22 no.2
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• pp.158-163
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• 1994

Microorganisms capale of utilizing linear alkylbenzene sulfonates(LAS) as sole carbon source were isolated from industrial effluent by using LAS agar plates. The isolated strains were identified as Salmonella sp(BC-2) and Escherichia sp.(BC-3) from the results of morphological, cultural and biochemical tests. The optimal condition for the growth and biodegradation of LAS was the initial pH 7.0 and LAS concentration 0.1%. The isolated BC-2 and BC-3 strains harbored plasmid and LAS-degrading activity was lost when the plasmids were cured by mitomycin C. The plasmids were transformed into E. coli and transformants have the LAS-degrading activity. Isolated strains were examined for primary biodegradation rate of LAS in the medium by methylene blueactive substance(MBAS) method. Of these isolates, BC-2 and BC-3 strains degradated LAS upto 60% and high resistant to CdCl$_{2}$ and HgCl$_{2}$. Isolated strains were sensitive to chloramphenicol, kanamycin, rifampicin, streptomycin and tetracycline but resistant to ampicillin and lincomycin.] Its minimal inhibitory concentration(MIC) for ampicillin was more than 1500 $\mu $g/ml.

• 한국IT서비스학회:학술대회논문집
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• 2009.05a
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• pp.487-490
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• 2009

USN과 BcN은 모두 별개의 기능적 특성을 갖는 네트워크들을 지칭하고 있지만, 그 네트워크를 이용한 서비스를 실현하기 위한 상위 기능요소 및 각 요소간의 관계를 포괄하기도 한다. 그럼에도, USN 영역에서는 BcN을 높은 성능의 장거리 전달 망으로 보는 시각이 지배적이며, BcN 영역에서는 여러 종류의 가입자망 중 하나로 USN을 인식하고 있어, 둘 간의 체계적 연동을 어렵게 하고 있다. 본 논문에서는 두 서비스 제공구조의 분석을 통하여 일반화를 수행하고, 정의된 모델에 필요 기능을 할당한 후 각 기능간의 연동방식에 관하여 논함으로써, USN과 BcN 두 영역의 컨버전스를 실현할 수 있는 서비스 구조를 제안한다.