• 한국수산과학회지
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• 제33권4호
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• pp.280-287
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• 2000

참보라색우무는 우리나라 연근해에서 쉽게 채취할 수 있는 미이용 해조류로서 해조류에서 새로운 천연항균성물질을 개발하기 위한 기초자료를 얻을 목적으로 항균성물질을 각종 칼럼을 통하여 분리정제하였으며, MS, NMR spectrum에 의하여 구조를 확인하였고, X선회절분석으로 결정구조를 해석하였다. 또한 이들 물질이 가지는 몇가지 특성을 조사하였다. 참보라색우무 670 g 중에서 최종적으로 세 개의 항균성물질(SL-l, SL-2, SL-3)이 각각 85 mg, 135 mg, 27.7 mg을 얻었다. SL-1 및 SL-2는 MS 및 NMR에 의하여 2,3,6-tribromof,5-dihydroxybenzyl alcohol (MW, 374) ,2,3,6-trib romo4,5-dihydroxybenzyl methyl ether (MW, 388)이였으며, 특히 SL-2를 벤젠-디에틸 에테르 용매중에서 결정화하여 X선 결정 해석에 의하여서도 구조가 확인되었다. 한편 SL-3는 SL-2와 MS 및 carbon NMR spectrum에서 잘 일치하였으나 proton NMR에서 signal의 패턴이 약간 달라 SL-2의 어떤 이성질체라고 추정되었다. 참보라색우무 항균성물질의 마우스에 대한 치사독성은 SL-1은 3 mg, SL-2는 5 mg까지는 별다른 영향을 미치지 않았으며, PhIP 및 MeIQx에 대한 돌연변이원성 억제효과는 SL-1은 $200 {\mu}g/ml$의 농도에서는 $17.8 {\%}$ 및 $17.7 {\%}$에 미치지 않았으나SL-2는 $250 {\mu}g/ml$의 농도에서는 높은 억제효과를 나타내어 새로운 보존료로서의 이용가능성을 제시하였다.

• 대한의생명과학회지
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• 제18권2호
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• pp.146-151
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• 2012

Urinary tract infection (UTI) is one of the most common bacterial infections and is predominantly caused by uropathogenic Escherichia coli (UPEC). UPEC strains generally possess several genes encoding virulent factors, which are mostly adhesins, toxins, bacteriocin and siderophores. E. coli is composed of four main phylogenetic group (A, B1, B2, D) and virulent extra-intestinal strains mainly belong to groups B2 and D. Prescription of ciprofloxacin, a kind of fluoroquinolone group antibiotics, is increasing now a days, but resistance to this drug is also increasing. A total of 188 strains of E. coli were collected. Thirteen strains were collected from healthy students in 2011 and 175 strains from patients with urinary tract infection in 2010. Virulence factor genes (papC, fimG/H, sfaD/E, hlyA, cnf1, and usp) were amplified by polymerase chain reaction (PCR) methods for phylogenetic group (A, B1, B2, D) detection. Ciprofloxacin susceptibility test was performed by disk diffusion method. The identified virulence factors (VFs), phylogenetic groups and ciprofloxacin resistance in 13 E. coli strains isolated from healthy students were papC (15.4%), fimG/H (76.9%), sfaD/E (30.8%), hlyA (23.1%), cnf1 (23.1%), usp (7.7%), phylogenetic group A (23%), B1 (8%), B2 (46%), D (23%) and ciprofloxacin resistance (7.7%), while those of in 175 E. coli strains isolated from patients with UTI were papC (41.1%), fimG/H (92.5%), sfaD/E (30.3%), hlyA (10.3%), cnf1 (30.3%), usp (27.4%), phylogenetic group A (9.1%), B1 (5.1%), B2 (60.6%), D (25.1%) and ciprofloxacin resistance (29.7%). In this study, 10 out of 13 E. coli strains (76.9%) from healthy students were found to possess more than one virulence factor associated with adhesion. In addition, one E. coli strain isolated from healthy students who had never been infected with UPEC showed ciprofloxacin resistance. According to these results between the virulence factors and phylogenetic groups it was closely associated, and UPEC strains isolated from patients showed high level of ciprofloxacin resistance.

• 한국작물학회지
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• 제46권1호
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• pp.17-21
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• 2001

Soybean mosaic virus (SMV) resistance of Korean recommended soybeans was evaluated naturally and by mechanical inoculation in Suwon. Based on the differential reaction of forty-four soybean genotypes tested to nine different SMV strains, soybeans were classified into twenty-four groups. Myeongjunamulkong and Ilpumgeom-jeongkong showed a high degree of resistance to nine SMV strains, having no symptom. The other cultivars produced various reactions according to inoculation of each SMV strain: symptomless, mosaic or systemic necrosis. Only five cultivars such as Kwangankong, Eunhakong, Tawonkong, Namhaekong, Sobaegnamulkong were totally susceptible to every strain. There was variation in disease incidence. Soybeans, having the highest levels of resistance to G5H and G7H in the greenhouse, showed the lowest levels of SMV incidence in the field of Suwon. Myeong-junamulkong, Ilpumgeomjeongkong, Soyangkong, Pungsannamulkong, Sodamkong, Jangmikong, Geomjeong-kong2, Pureunkong, Sinpaldalkong2, Duyoukong, and Geumgangkong were fairly resistant to SMV. And SMV incidence of Taekwangkong, Saealkong and Baegunkong was over 45% with symptom of bud necrosis. And soybeans, highly resistant to SMV in the field and the greenhouse, were mainly derived from Jangyeobkong and Hwang-keumkong resistant to G1-G7.

• Journal of Microbiology and Biotechnology
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• 제17권8호
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• pp.1262-1270
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• 2007

Some hot springs located in the west of Turkey were investigated with respect to the presence of thermophilic microorganisms. Based on phenotyping characteristics and 16S rRNA gene sequence analysis, 16 of the isolates belonged to the genus Geobacillus and grew optimally at about $60^{\circ}C$ on nutrient agar. 16S rRNA gene sequence analysis showed that these isolates resembled Geobacillus species by ${\ge}97%$, but SDS-PAGE profiles of these 16 isolates differ from some of the other species of the genus Geobacillus. However, it is also known that analysis of 16S rRNA gene sequences may be insufficient to distinguish between some species. It is proposed that recN sequence comparisons could accurately measure genome similarities for the Geobacillus genus. Based on recN sequence analysis, isolates 11, IT3, and 12 are strains of G stearothermophilus; isolate 14.3 is a strain of G thermodenitrificans; isolates 9.1, IT4.1, and 4.5 are uncertain and it is required to make further analysis. The presence of xylanase and arabinofuranosidase activities, and their optimum temperature and pH were also investigated. These results showed that 7 of the strains have both xylanase and arabinofuranosidase activities, 4 of them has only xylanase, and the remaning 5 strains have neither of these activities. The isolates 9.1, 7.1, and 3.3 have the highest temperature optima ($80^{\circ}C$), and 7.2, 9.1, AO4, 9.2, and AO17 have the highest pH optima (pH 8) of xylanase. Isolates 7.2, AO4, AC15, and 12 have optimum arabinofuranosidase activities at $75^{\circ}C$, and only isolate AC15 has the lowest pH of 5.5.

• KSBB Journal
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• 제19권4호
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• pp.250-256
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• 2004

본 연구에서는 C형 인지질 분해효소 (PLC)를 생산하는 것으로 알려진 각종 B. cereur (B. cereus 11, 315, 559 와 B. cereus ATCC10987)의 배양을 통해 미생물의 성장과 PLC의 생산 특성을 조사하였다. 특히, LB 배지에서 최대 PLC 생산(85 units/mL) 특성을 보인 B. cerrur 318를 이용하여 균체성장 및 PLC 생산에 적합한 배양 배지를 조사하였다. 탄소원으로는 glucose, 질소원으로는 yeast extract와 peptone, 인산과 아연의 농도는 각각 0.5∼l g/L과 0.02∼0.04 g/L이 PLC의 생산을 최대로 할 수 있는 적합한 배양액의 조성인 것으로 나타났다. 또한, B. cereus를 이용하여 PLC를 생산할 때 배양 온도는 3$0^{\circ}C$, 배양액의 pH는 7.5로 배양하는 것이 균체성장 및 PLC 생산에 효율적임을 알 수 있었다. 한편, B. cereus에 의해 생산된 PLC의 반응 특성을 연구하였는데, B. cereus 11 과 318에 의해 생산된 PLC는 45$^{\circ}C$, pH 4에서 최대 활성을 보였고, B. cereus 559에서 생산된 PLC는 5$0^{\circ}C$, pH 7에서 최대 활성을 나타냈다. B. cereus에서 생산된 PLC에 망간 이온, 코발트 이온 그리고 DMSO가 첨가되었을 때는 PLC의 활성이 상당히 증가했고, 구리 이온, glycerol, isopropanol 과 SDS등을 첨가했을 때는 PLC 활성이 감소함을 볼 수 있었다.

• 한국식품영양과학회지
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• 제30권3호
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• pp.395-402
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• 2001

Bacillus subtilis 돌연변이주 중 ${\gamma}-GTP$활성이 높은 SM-2와 SM-10을 융합시켜 획득한 융합주 중 ${\gamma}-GTP$활성이 높은 융합주 FG-21의 배양적 특성을 조사하였다. 융합주 FG-21에 의한 ${\gamma}-GTP$의 생산은 1% glycerol, 1% peptone, 0.1% citric acid, 5 mM $K_2HPO_4$, 1 mM $FeCl_3$, 1 mM $MgCl_2$, 1 mM $NH_4Cl$, pH 7.0의 배지에 의해 $37^{\circ}C$에서 36시간 배양했을 때 621 U/mL으로 최대한 활성을 보였다. 융합주 FG-21이 생산한 biopolymer A가 단백질함량이 38.4%이고 B. subtilis K-1이 생산하는 biopolymer B의 단백질함량은 19.3%로 융합주 FG-21이 생산하는 Biopolymer A보다 함량이 낮았다. 융합주 FG-21의 biopolymer가 모균주의 biopolymer B보다 단백질함량이 높은 것은 상대적으로 높은 ${\gamma}-GTP$활성이 높아서 생성된 PGA가 levan보다 함량이 많기 때문인 것으로 사료된다. 총당함량은 biopolymer A가 58.5%, biopolymer B가 76.5%로 나타났다. 융합주 FG-21과 모균주가 생산하는 biopolymer의 단백질함량과 총당함량비는 융합주 FG-21이 생성한 biopolymer는 38 : 59. 모균주가 생산한 biopolymer B는 19 : 78의 비율이었고 HPLC 분석에 의한 biopolymer A와 B의 fructose함량은 각각 537.7 mg/g biopolymer, 764.4 mg/g biopolymer으로 나타났다. Biopolymer A와 B의 glutamic acid함량은 각각 163.7 mg/g, 94.3 mg/g이었다. Biopolymer A와 B의 fructose와 glutamic acid의 함량비는 각각 78 : 22, 89 : 11의 비로 함유되어 있었다. 따라서 융합주에 의해 생산된 biopolymer는 모균주보다 구성상태가 변화된 biopolymer를 생산한 것으로 판단되어 fusion과 같은 균주개량을 통하여 물질의 구성적, 물질적 변화된 biopolymer를 생산할 수 있을 것이라 사료된다.

• 한국키틴키토산학회지
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• 제23권4호
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• pp.285-292
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• 2018

음식물쓰레기 분해용 균주를 선발하기 위하여 전통발효식품과 토양으로부터 내염성, 내열성을 갖는 균주 분리를 시도하였으며, protease, amylase, cellulase 및 lipase의 효소활성도를 평가하였다. 5% NA 배지에서 분리된 균주는 212종이었으며, 전통발효식품의 경우 4가지 효소활성을 가지고, 토양의 경우 2가지 이상의 효소활성을 가지며, 억제환이 15 mm 이상의 크기를 지닌 79종의 균주를 우선 선발하였다. 선발된 균주를 대상으로 분자유전학적 동정을 진행한 결과, 중복성을 배제하여 11종의 균주를 최종적으로 선발하여 혼합균주로 사용하였다. 혼합균주의 최적 배양조건으로는 배양시간은 24시간, 배양온도는 $30^{\circ}C$ 그리고 pH의 최적 조건은 7.0 부근인 것으로 확인되었다. 최적배양된 혼합균주 처리에 따른 음식물쓰레기 분해능 평가 결과 멸균수 첨가군은 10 mesh ($2000{\mu}m$)에서 103 g, 혼합균주 첨가군은 10 mesh ($2000{\mu}m$)에서 18 g인 것으로 보아 혼합균주로 나타나 음식물의 고형분의 입자가 액상으로 분해되었음을 확인하였다.

• 한국미생물·생명공학회지
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• 제17권6호
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• pp.556-562
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• 1989

The bioconversion of mandarin orange peel press liquor to single cell protein (SCP) by two yeast strains, F-60, and C-7, which were isolated from mandarin orange peel was carried out and compared with that of using Candida utilis IFO 0598. Experiments were directed toward the high yield of biomass and high protein in cultures of the strains mentioned above. Candida utilis IFO 0598, F-60 and C-7 strains were cultivated at 3$0^{\circ}C$, pH 5.2 for 3 days in shaking flasks. The effects of some nutrients on cell growth were studied. Cell mass and protein content per cell mass were increased by addition of urea 1%, KH$_2$PO$_4$ 0.1% and MgSO$_4$ㆍ7$H_2O$ 0.05%, When the F-60 strain cultured under the optimal conditions, cell mass, growth yield and protein content were 41.2g/l, 53.9%, 59.7%, respectively. Cell mass was also increased up to 15% by modifying the fermentation condition on the bench type 20l jar fermentor. Crude fat content (10.3%) of dried C-7 cell was higher than those of C. utilis and F-60, 4.9% and 5.6% respectively. Total protein content of the F-60 strain was 59.7% per dry weight. And we compared their amino acid compositions with that of FAO provisional pattern. In the case of the F-60 strains, amino acid contents such as lysine, leucine and isoleucine were much higher than those of methionine, cystine and tryptophan.

• 한국미생물·생명공학회지
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• 제23권4호
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• pp.405-410
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• 1995

In order to screen dextranase with high dextranolytic activity from microbial origins, dextranase producing fungal isolates were isolated from soil of the Taeion area. 197 strains with dextranolytic activities were isolated, out of which 3 strains with high dextranolytic activities were selected in the first screening. A strain (GR-98) with a best dextranolytic activity was selected in the second screening. The strain was identified to be similiar Aspergillus ustus by the morphological and cultural characteristics. The optimum culture temperature and initial pH for the dextranase production of the strain was 30$\circ$C and 7.0, respectively. The optimum culture medium was composed of 2% dextran, 0.3% KNO$_{3}$, 0.05% K$_{2}$HPO$_{4}$, 0.02% MgSO$_{4}$-7H$_{2}$O, 0.05% KC1, and 2.5 $\mu$g/ml pyridoxamine, and the enzyme production was maximum when the strain was subcultured at 30$\circ$C for 7 days.

• 대한미생물학회지
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• 제15권1호
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• pp.47-54
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• 1980

Exoenzymes, protease(P) and elastase(E) produced by Pseudomonas aeruginosa are reported to have close relationship with pathogenicity of Pseudomonas aeruginosa. Productibility of exoenzymes P and E were studied and compared in environmental isolates from hospital environments and clinical isolates from various clinical specimens, also, the relationship between their enzyme production and serotype were reviewed. 1. Clinical isolates were typed into nine serotypes A, B, C, D, E, F, G, H and I. Serotype E had the highest incidence of 24%, followed by B with 16.8%, G, 15.1% and C, 9.3%. 2. Environmental isolates were, typed as serotype B, C, E, F, G, H, I, K and M. Serotype I had the highest incidence of 26.6%, followed by C, F and M each incidence of 14.3%. 3. In the typing of the above two groups, serotypes A and D were found only in the clinical isolates and serotypes K, and M were found only in the environmental isolates. Serotypes J and L were found in neither clinical isolates nor environmental isolates. 4. In the distribution of serotypes from various clinical specimens, serotype G among isolates from pus showed incidence of 20.4%, and serotypes E and B were 19.5% separately. Serotype E had incidence of 22.6% and 20.0% in urine and sputa respectively, showing a high rate compared to the other serotypes. 5. The incidence of strains producing both exoenzymes P and E was 77.8% in the preserved strains of clinical isolates and 76.2% in the environmental isolates. There were no significant difference between the two groups. 6. Serotypes A and H, which are preserved strains from clinical isolates showed productibility of both exoenzymes P and E, the other serotypes showed productibility of various combination of exoenzymes. Among the environmental isoaltes, production of both exoenzymes P and E were seen in serotypes E, F, G, H, I and K and no serotype produced only P or E. 7. In ability to produce exoenzymes of isolates from sources of various clinical specimens, strains producing both exoenzymes P and E were found most frequently in pus with incidence rate of 82.0%, followed by 80.0% in sputum and urine. 8. Almost all the fresh strains of clinical isolates were producers of both exoenzymes P and E.