• 한국식품저장유통학회지
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• 제22권2호
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• pp.251-255
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• 2015

산업적 유산균 배양의 가격대비 효율성을 높이기 위하여 질소원, 탄소원 및 무기염물을 기본량으로 기본배지를 제조하고, 효율적인 고농도 유산균체를 수득하기 위하여 pH 조절제로서 따로 첨가되어지는 합성 화학물질을 대신하여 미역을 실험에 사용하였다. 미역의 최적의 첨가 방법을 찾고자 추출, 착즙, 분말의 형태로 배지를 제조하여 유산균증식능 평가한 결과, 착즙의 형태에서 유산균 증식능이 가장 큰 것으로 확인되었다. 이러한 실험 결과를 통해, 폐기되어 환경오염의 원인이 되는 가식부 외 미역을 유산균 배양배지에 착즙형태로 첨가함으로서 종래 pH 조절을 위해 완충액으로 첨가되는 합성 화학물질을 대체하여 활용될 수 있음을 확인하였다. 또한 미역첨가 기본배지 선정에 따른 배지 단가를 절감하면서 높은 균체 수율을 얻는 등 충분한 경제적 장점을 기대할 수 있다. 이러한 연구결과는 미역을 이용함으로써 배양 시 해조류의 식이섬유 등이 정장작용에 유산균의 시너지 효과뿐만 아니라 폐기되는 천연 식물자원을 활용함으로써 새로운 부가가치 창출과 환경오염을 예방하는 효과를 기대할 수 있을 것이다.

• 한국수정란이식학회지
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• 제28권2호
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• pp.113-119
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• 2013

The study focuses on the quality assessment of Black Bengal buck semen preserved at chilled condition. In this in vitro trial, collected semen from Black Bengal bucks was preserved at chilling temperature ($4{\sim}5^{\circ}C$) in tris-glucosecitrate yolk medium of 1:5 ratios for four days. Artificial Vagina (AV) method was utilized to collect semen from buck. General evaluation of semen includes the color, mass activity and density were measured by direct visual examination. However, computer-assisted sperm analysis (CASA) and phase contrast microscopy were used to figure out the motility (%), hyper-activated (HYP) motility (%) and number of abnormal spermatozoa (%) initially, and at every 24 h intervals. The result revealed that spermatozoa preserved at chilling temperature showed significantly (P<0.05) lower motility and HYP motility with the progression of preservation. The number of phenotypically abnormal spermatozoa significantly (P<0.05) increased following preservation. Although significant positive correlation (r=0.945; P<0.05) was existed between % motile and % HYP motile spermatozoa however, the % of morphologically abnormal spermatozoa was negatively correlated with % motile (r=-0.997; P<0.05) and % HYP motile spermatozoa (r=-0.946; P<0.01). Therefore, we concluded that the quality of chilled semen progressively losses its viability and doesn't remain useable after certain period of preservation with respect to its motility and morphology.

• 한국가축번식학회지
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• 제14권1호
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• pp.31-35
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• 1990

Eosin B의 사용에 의한 rat 난모세포의 생존성 및 발달가능성을 검사하였다. 염료는 Brinster's Medium for Ovum Culture puls glucose (BMOC)-2 medium ml당 eosin B 1.0mg을 함유하는 stock solution으로 준비하였다. 난모세포연구를 위하여 BMOC로 stock solution을 희석하여 만든 3가지의 염료농도들이 선택되었다 : 0.12mM, 0.60mM, 1.20mM. 난소세포들로부터 난모세포들을 채취하고, 보존기간 및 열 처리의 다양한 조건하에서 eosin B를 사용한 dye exclusion assay로 검사하였다. 생존한 난모세포는 eosin B를 배척하고, 사멸한 세포는 eosin B를 배척하지 않는 것으로 제시되었다.

• Journal of Microbiology and Biotechnology
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• 제16권12호
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• pp.1947-1953
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• 2006

There have been a number of studies of methods for recycling animal wastewater to provide new bioresources. In the present work, a marine algal culture medium, designated KEP II, was prepared by adding swine waste (3% v/v) fermented by soil bacteria to a dilution of f/2 culture medium (CT). When Phaeodactylum tricornutum was grown in batch culture in KEP II, the cells lasted long at the exponential phase producing the specific growth rate and biomass; the production of total amino acids and secondary metabolites rose up to 5-fold. It also substantially enhanced the maximum quantum yield of photo system (PS) II of P. tricornutum, greatly increased the level of thylakoid membranes containing PS, and stimulated the production of pyrenoids, including enzymes for $CO_2$ fixation in chloroplasts. KEP II should improve the cost efficiency of industrial mass batch cultures and the value of microalgae for long-term preservation of fresh aquaculture feed as well as production of anticancer and antioxidant agents. Specifically, a low-cost medium for growing the diatoms of aquaculture feed will be economically advantageous.

• 한국미생물·생명공학회지
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• 제8권2호
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• pp.87-92
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• 1980

선정균을 장기간 보다 안전하게 관리하고 균의 성질을 개선하기 위하여 실험한 결과는 다음과 같다. 1) 선정균은 대체로 0~5$^{\circ}C$에서 soil 배지에 보존하는 것이 좋았으며 보존기간 10개월까지는 산생성력에 큰 변화를 보이지 않았다. 2) 선정균 M-315는 강산성지에 계대배양하므로서 산생성능이 약간 향상되였으며 종균으로는 포자형성배지에 7~10일간 배양한 균의 포자로 접종하는 것이 좋았다. 3) 선정균에 자외선을 조사시킨 결과 형태적으로 변화된 변이주 109주을 분리하였고 그 중 산생성력이 3.2% 향상된 변이주 M-812를 얻었다.

• Journal of Chest Surgery
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• 제27권1호
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• pp.1-8
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• 1994

Allograft cardiac valves have been used for over 30 years to replace diseased cardiac valves, reconstruct right or left ventricular outflow tract. With increasing its requirement, the establishment of a viable bank capable of maintaining the viability of graft over a prolonged period would be desirable. The method for determining the viability of allograft by metabolic assay technique using radiolabeled aminoacids has been used recently. An experimental study was done for evaluation of viability of cardiac allograft which was preserved for 14 days at 4oC in nutrient medium[fresh preservation] by metabolism assay technique using 3H-glycine. Also, the effectiveness of low concentration antibiotic solution[CLPV] for sterilization was evaluated. The effectiveness of CLPV solution for sterilization of allograft was perfect. Pre-treatment cultured organisms were not cultured after treatment at all in every cases. The viability of allograft after sterilization was reduced to 66.4%[aortic wall], 74.7%[pulmonary wall], 76.3%[aortic valve], 67.9%[aortic wall]. And after the fresh preservation for 14 days, the viability was reduced to 14.7%, 18.5%, 17.7%, 19.0%, respectively.In conclusion, viability of allograft was reduce to 71.3[66.4-76.3]% after sterilization and 17.5[14.7-19.0]% after fresh preservation. And sterilization effect of CLPV solution was satisfactory.

• 한국식품영양과학회지
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• 제29권5호
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• pp.888-892
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• 2000

Antimicrobial activity of Caesalpina sappan L. extract (CS extract) against 6 kinds of food spoilage and pathogenic organisms was studied. The growth of Listeria monocytogenes Brie 1, Escherichis coli ATCC 11775, Staphylococcus aureus ATCC 11775, and Pseudomonas fluorescens ATCC 11775 was inhibited about 4 to 5 $log_{10}$ cycle in Tryptic soy Broth(TSB) containing 1% CS extract. Bacillus subtilis KCTC 102 and Vibrio parahaemolyticus ACTT 17802 did not show apparent growth in the same medium. Effect of CS extract on preservation of ground meat was also investigated. The range of pH change was 5.0~5.2 in CS extract added ground meat, 5.2~6.0 in CS extract not added ground meat (control) during storage at 4$^{\circ}C$ for 30 days. Number of total bacteria after 15 days storage was $10^{6}$/g in CS extract added ground meat, 10$^3$/g in control. Redness of ground meats was improved significantly by addition of 1% CS extract during storage at 4$^{\circ}C$ for 30 days. The sensory quality of 1% CS extract added hamburger patty was similar to that of the control in taste, flavor, and overall acceptability.

• International Journal of Computer Science & Network Security
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• 제23권2호
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• pp.101-110
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• 2023

Vehicular Ad Hoc Network (VANET) is considered to be a subclass of Mobile Ad Hoc Networks (MANET). It has some challenges and issues of privacy which require to be solved before practical implementation of the system i.e., location preservation privacy. Many schemes have been proposed. The most prominent is pseudonym change based location preservation scheme. Safety message can be compromised when it sends via a wireless medium, consequently, an adversary can eavesdrop the communication to analyze and track targeted vehicle. The issue can be counter by use of pseudo identity instead of real and their change while communication proves to be a sufficient solution for such problems. In this context, a large amount of literature on pseudonym change strategies has been proposed to solve such problems in VANET. In this paper, we have given details on strategies proposed last two decades on pseudonym change based location preservation along with issues that they focus to resolve and try to give full understanding to readers.

• 보존과학회지
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• 제35권6호
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• pp.588-599
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• 2019

발굴 조사 된 매장문화재는 학술적, 역사적 가치에 따라 문화재청장이 보존조치를 결정하지만, 이전·복원 후 관리, 보존, 활용은 체계적으로 이루어지고 있지 않고 있다. 또한 보존유적 및 보호시설의 손상으로 보존방안과 활용도에 대한 문제점이 발생되고 있다. 이에 충북 지역 보존유적에 대한 현황을 조사하여 보존방안 및 활용방안에 대하여 제시해 보고자 하였다. 충북에는 총 43개의 보존유적이 있었으며, 관리주체의 명확성 여부를 떠나 대부분 체계적인 관리는 이루어지고 있지 않았다. 잘못된 보존처리와 재료의 선정 등으로 인해 유구 및 보호시설이 훼손 되어지고 있는 상태로 확인되었으며, 보존유적의 훼손으로 전시, 교육, 체험 등 활용성에서도 문제점을 확인하였다. 이러한 문제점 해결에는 법적·제도적 장치의 개선, 예산·전문 인력 확보. 표준화 매뉴얼 개발 및 적용, 지속적 모니터링, 예방보존, 이전 지료 및 방법 연구, 목록화 작업, 전문 박물관 및 복합 테마 파크 조성 등 중·장기적인 계획이 세워져야 할 것이다. 또한 조사된 보존유적에 맞는 보존방안을 제시하고, 이를 기반으로 보존·관리가 이루어지면 보다 체계적·과학적으로 보존·관리되고 교육, 전시, 홍보 등 다양한 목적으로 활용될 수 있을 것으로 판단된다.

• 한국식품저장유통학회지
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• 제2권2호
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• pp.251-257
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• 1995

In order to determine the quality of Citrus unshiu(medium cultivar of satsuma mandarin) produced in Cheju, citrus fruits sampled at sorting places and harvested directly on citrus tree in south and north area of Cheju were analyzed. The fruits were grown in size till early of November, and soluble solids were increased continuously after that. Compared with the quality of citrus fruits as a factor of soluble solids, firmness, total sugar, pH, and color index, the optimum harvest periods were supposed to be reasonable from early of December for C. unshiu Marc. var. yonezawa and C. unshiu Marc. var. hayashi, Fruit weights and peel thickness had a linear correlation with increasing fruit size, but soluble solids and acid contents had not a correlation. The selection of C. unshiu variety was needed to determine by the properties of storage.