• Bulletin of the Korean Chemical Society
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• 제35권1호
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• pp.39-44
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• 2014

Glass discs functionalized with alkynyl (GDA) terminated monolayers were prepared and incubated in $AgNO_3$ solution (GDA-Ag). The modified functional glass surfaces were characterized by X-ray photoelectron microscopy (XPS). The potential of GDA and GDA-Ag as antimicrobial surfaces was investigated. Anti-microbial efficacies of GDA against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, and Candida albicans was relatively low ranging from 4.67 to 17.00%. However, the GDA-Ag was very effective and its antimicrobial efficacy ranged from 99.90 to 99.99% against the same set of microbial strains except for C. albicans where it was 95.50%. The durability of the Ag bonded to the terminal alkynyl groups was studied by placing the GDA-Ag in PBS buffer solution (pH 7.4) for two weeks. Initially, the silver release was relatively fast, with 40.05 ppb of silver released in first 24 h followed by a very slow and constant release. To study the potential of GDA-Ag for medical applications, in vitro cytotoxicity of GDA-Ag against Human Embryonic Kidney 293 (HEK293) cell lines was studied using WST-assay. The cytotoxicity of the GDA-Ag was very low (5%) and was almost comparable to the control (blank glass disc) indicating that GDA-Ag has a promising potential for medical applications.

• 대한수의학회지
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• 제41권2호
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• pp.197-202
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• 2001

Although several methods have been developed and applied to control swine respiratory diseases, the disease induces severe economic impact to swine industry worldwide. As one of the new trials, application of egg yolk antibody(IgY) was attempted for the purposes and immune response in sera and egg yolk was analysed with ELISA in previous study. In this study, immunological specificity of the IgY was analysed by Western blot analysis. In the analysis of causative agents of atrophic rhinits, B bronchiseptica and P multocida 4D, proteins of 33, 40, 43, 67 and 141 kDa were specifically reacted with IgY Also, 40 and 110 kDa proteins were identified as the major immunogens in P multocida 3A. In A pleuropneumoniae serotypes 2 and 5, 40 kDa and 47 kDa proteins were found to be the major reactive ones. These results suggested that egg yolk antibodies from immunized hens was specific with antigens injected into hens and partially purified antigens, outer membrane proteins and dermonecrotic toxin, were more effective than bacterin for the production of specific antibody.

• Applied Biological Chemistry
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• 제42권1호
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• pp.6-11
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• 1999

fibrin 단백질을 분해할 수 있는 효소를 분비하는 균을 된장으로부터 분리하여 동정하였다. 된장으로부터 protein 분해능이 있는 균주를 분리하고 분리한 균주들 중에서 혈전용해능이 가장 우수한 균주인 KDO-13을 선발하였다. 이 균주는 호기성으로 포자를 형성하는 Gram(+)균 이었으며 gas chromatography에 의한 세포의 지방산 분석은 $C_{15:0}$ anteiso fatty acid가 47.7%, $C_{15:0}$ iso fatty acid가 13.5% 이었다. 이 균주는 생리, 생화학적 특성 및 세포지방산 분석을 통하여 57.7%의 similarity를 갖는 Bacillus atrophaeus로 잠정 동정되었다. Bacillus atrophaeus KDO-13의 fibrinolytic enzyme 생성을 위한 최적 배양 온도와 pH는 각각 $37^{\circ}$와 6.0 이었다.

• 한국식품과학회지
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• 제33권1호
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• pp.84-88
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• 2001

우리 나라 전통발효식품인 된장으로부터 angiotensin 전환효소(angiotensin converting enzyme, ACE) 저해활성이 우수한 균주 SYG3를 분리하여 형태학적, 배양학적, 생리학적인 특성을 조사한 결과 B. pumilus 또는 그 유연균으로 동정되었다. 분리 균주의 ACE 저해물질 생산조건을 알아보기 위해 각종 배양조건에 따른 저해활성을 조사한 결과, 탄소원으로서는 glucose, 질소원으로서는 soybean powder에서 가장 높은 저해활성을 나타내었으며, skim milk와 casein에서도 비교적 높은 저해활성을 나타내었다. Soybean powder 농도에 따른 저해활성은 5%(w/v) 첨가시 가장 높은 저해활성을 나타내었으며. 그 이상의 농도에서는 저해활성의 변화가 거의 없었다. NaCl 농도는 3%(w/v) 첨가시 저해활성이 가장 높은 것으로 나타났으며 배양온도는 $32^{\circ}C$, 초기 pH 7.0에서 가장 높은 저해활성을 나타내었다. 최적배지조건에서의 배양시간에 따른 ACE 저해활성은 배양 36시간에 약 98%로서 최고에 도달하였다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제27권6호
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• pp.523-527
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• 2005

Allograft donations are commonly found to be contaminated. The most of tissue banks has promoted the use of ionizing radiation for the sterilization of biological tissues. The potential for transmission of human infectious diseases and contamination of microorganism has created serious concern for the continued clinical use of hard and soft-tissue allografts. Tissue banks have employed 15-25kGy for sterilization of hard and tendon allografts, which, according to the national standards, approaches the level at which the tissue quality is adversely affected for transplantation. The donations of allogeneic tissues to the Korea Tissue Bank over a 2-year period were reviewed, and the incidence and bacteriology of contamination were detailed. Clinical outcomes were determined for donors who had positive cultures at the time of retrieval and during the processing and they were compared with those of post sterilization. After exposure of the frozen block bone to 25kGy and the processed tissues to 15kGy of gamma irradiation, the authors were able to demonstrate complete inactivation of the bacteria. The aim of this study was to obtain the effects of gamma irradiation and the irradiation dose according to the type of tissue, through conventional microbiologic test without on influence of biocompatibility in allografts. The contamination rate after the final irradiation sterilization is 0% in the processed allografts. This may be due to the fact that the gamma radiation and processing steps are effective to control contamination.

• 미생물학회지
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• 제27권4호
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• pp.404-414
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• 1989

김치발효 중 Gram 양성세균 또는 유산균의 분리와 동정을 시도하였다. 종의 다양성은 분리배지와 온도에 영양을 받았고, 다양성은 온도가 낮아질수록 감소하는 경향이었다. MRS는 세균의 분리에 KM(김치재료로 만든 자연배지)은 종의 수를 파악 하는데 각각 적합하였다. 분리균의 동정은 Bergey's manual of Systematic Bacterio]ogy (1986)를 기초로 하여 작성한 이 분농생표(dichotomous Identification scheme)에 의하여 선행하였다. 각 온도(5, 15, $25^{\circ}C$)에서 동정된 Gram 양성세균은 Leuconostoc 5종, Streptococcus 4종, Pediococcus 3종, Bacillus 2종 그리고 Ltobacillms 18종이였다. 각 온도에서 출현 빈도가 높은 종은 $25^{\circ}C$에서 LactobaIlus ptantanmz, Streptococcµs faffinolactis, Leuconostoc maιnteroid, subsp mlsentιroides 이었고, $15^{\circ}C$에서 L. mesenteroides Lactobacillus fructosus, L. maen teroid,l.I subsp. mesent,roid, 이였고, $5^{\circ}C$ 에서 Leuconostoc sp.(65.2 빈도)에 의하여 이루어졌다. 그리고 각 온도에 따른 김치발효 중 지금까지 알려진 Pediococcus cerevisiae 와 Streptococcus faecalis는 분리되지 않았다.

• Applied Biological Chemistry
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• 제40권5호
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• pp.369-374
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• 1997

키토산으로부터 고중합도 키토산올리고당을 얻기 위해서, 해안가 갯벌토양 중에서 chitosan 분해활성이 강한 균주를 선발하였다. 선발된 균주를 Bergey's Manual of Systematic Bacteriology을 토대로 형태적, 생화학적 특성을 동정한 결과, 그람 양상, 간상 $(0.4-0.6{\times}1.6-2.2{\mu}m)$, catalase 양상, 운동성 양성이었으며 pH 4.5-11.0과 2% NaCl을 함유한 배지에서 성자하였고, $42^{\circ}C$ 이하에서 성장하였다. 이들 균주의 DNA를 PAPD PCR 분석하여 동정하였다. 이 결과를 종합하여, 가장 강한 내부가수분해를 보인 균주 P16을 Bacillus sp.로 잠정 분류하고 이를 최종적으로 Bacillus sp. P16으로 명명하였다. 이 균주의 배양 상등액은 키토산에 대해 강한 액화능을 보였으며, 키토산 용액의 점성을 신속히 감소시켰다. 이 균주가 생산하는 키토산분효소는 TLC, HPLC, viscometry 등의 분석결과를 보건대 중합도 2-7의 올리고당을 생산하는 endo-splitting type의 endochitosansane인 것으로 보였다.

• 대한수의학회지
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• 제60권1호
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• pp.19-24
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• 2020

This study assessed the effects of probiotics in canine atopic dermatitis (AD). We enrolled 11 client-owned dogs with AD and randomly allocated them to two groups. The probiotics group (n = 7) was prescribed with Bifidobacterium longum while the control group (n = 4) received a placebo powder once a day for 12 weeks. In both groups, the degree of skin lesions was evaluated based on the Canine Atopic Dermatitis Extent and Severity Index (CADESI)-4. We also measured the transepidermal water loss (TEWL). We assessed pruritus severity using the pruritus visual analog scale (PVAS). Alteration of consumed drug doses was converted into medication scores. All the evaluation indices were surveyed every 4 weeks. In the probiotics group, there was a significant decrease in the CADESI-4 score at 4, 8, and 12 weeks compared to that of the baseline score (p < 0.05). There was no significant difference in TEWL, PVAS, and medication score at each time point and between groups. Although these results showed that Bifidobacterium longum did not reduce pruritus, TEWL, and the dosage of drugs for canine AD, it was effective in improving skin lesions, therefore, probiotics could be considered in canine AD with severe skin symptoms.

• 대한수의학회지
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• 제60권1호
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• pp.9-14
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• 2020

This study describes pathological, immunohistochemical, and bacteriological findings in adult dogs and fetuses naturally infected with Brucella (B.) canis. A total of 42 dogs including 40 dogs and 2 aborted fetuses were examined. The most common gross lesions in infected dogs were swelling of lymph nodes and spleen. The testes showed marked swelling with multifocal to diffuse reddish discoloration. The most significant histopathological lesions were observed in the placenta. Placental trophoblasts were markedly hypertrophied due to the accumulation of intra-cellular gram-negative bacteria. Lymphocytic inflammation of varying severity was observed in the reproductive organs such as male testis, epididymis, and prostate gland and female uterus. Strong immunolabelling was observed in the cytoplasm of most trophoblasts in the placental tissues using immunohistochemistry. However, immunohistochemical staining did not demonstrate any organisms in other organs of dogs and fetuses. B. canis isolates were most frequently obtained from the whole blood (82.5%) and superficial inguinal lymph node (77.5%) in both sexes. In addition, the isolation rate was higher in male genital organs than in those of females. Hence, management of male dogs is most important because infected dogs can play a role as carriers.

• Parasites, Hosts and Diseases
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• 제46권3호
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• pp.199-201
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• 2008

Toxoplasma gondii is an obligate intracellular zoonotic protozoan with a worldwide distribution. It infects humans as well as a broad spectrum of vertebrate hosts. Cats and wild felidae play crucial roles in the epidemiology of toxoplasmosis. This study was performed to survey the prevalence of T. gondii infection among stray cats in the Gyeonggi-do, Republic of Korea. A total of 174 stray cat blood samples were collected from Gwacheon-si (n = 20), Bucheon-si (82), and Yangju-si (72). Positive sera for T. gondii were identified in 14 samples (8.1%) exclusively via the latex agglutination test, 28 (16.1%) via ELISA, and 23 (13.2%) via PCR analysis. The overall infection rate of female stray cats (29.2%) presented as higher than that of male cats (24.0%). This study suggests that T. gondii is widespread in the stray cat population of Gyeonggi-do, Korea. It is urgently needed to control urban stray cat population and to reduce the risk of zoonotic transmission of toxoplasmosis to other animal hosts and humans.