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Kefir 및 Yoghurt 에서 분리된 Lactobacillus spp. 와 Non - starter 균주에 의한 돌연변이억제 ( 항암 ) 활성
윤영호(Y . H . Yoon),조중근(J . K . Cho),백영진(Y . J . Baek),허철성(C . S . Huh) 한국축산학회 1999 한국축산학회지 Vol.41 No.1
The antimutagenic activities of Lactobacillus spp. isolated from European kefir and yoghurt and those of non starter Lactobacillus and Bifidobaterium strains against 2-Nitrofluorene were studied by Ames test utilizing Salmonella typhimurium TA 98 to investigate probiotic effects of the strains. The optimal concentration of mutagen 2-nitrofluorene to produce 3,000 revertant colonies per plate turned out to be 10 ㎍/plate. Thirty six strains out of forty Lactobacillus spp. strains isolated from European kefir and yoghurt revealed antimutagenic activity and L. plantarum CU 722 showed the strongest antimutagenic activity of 50.34%. The antimutagenicity of non starter Lactobacillus and Brfidobacterium strains resulted in average 15% and 20% of mutation inhibition rate respectively. The effect of S-9 mix addition on the antimutagenicity rate against 2-Nitrofluorene was species and strain dependent.
Lactobacillus spp. 와 Bifidobacterium spp. 의 Pulsed Field Gel Electrophoresis 에 의한 Genomic DNA 의 특성
윤영호,백영진,이재후 ( Y . H . Yoon,Y . J . Baek,J . H . Lee ) 한국축산학회 1998 한국축산학회지 Vol.40 No.1
Characteristics of genomic DNA of Lactobacillus spp. and Bifidobacterium spp. were determined by pulsed field gel electrophoresis and the following results were obtained; Four enzymes, Sma I, Apa I Not I and Sfi I were identified as suitable for generation of relatively few numbers of distinct fragments from the Lactobacillus spp. genomes, whereas five enzymes, Sma I, Apa I, Sfi I and Dra I were suitable for Bifidobacterium spp. genomes. The genome sizes of Lactobacillus spp. ranged from 1.S8Mb to 3.31Mb, the genome sizes of L. brevis ATCC 8287, L. fermentum ATCC 14931, L. casei YIT 9018, L. plantarum KCTC 1048 and L. delbruekii subsp. delbruekii ATCC 9469 were estimated to be 1.93Mb, 1.98Mb, 2.84Mb, 2.81M6 and 1.82Mb, respectively. Those of Bifidobcxterium spp. ranged from 1.85Mb to 2.83Mb. The genome sizes of B. bifrdum ATCC 29521, B. longum ATCC 15707, B. infantis ATCC 15697 and B. bifidum CU 1370 were estimated to be approximately 1.85Mb, 2.83Mb, 1.86Mb and 1.94Mb, respectively.
허정원,김정호,백영진,정기철,이용규 ( J . W . Huh,J . H . Kim,Y . J . Baek,K . C . Chung,Y . K . Lee ) 한국축산학회 1990 한국축산학회지 Vol.32 No.5
This reseach was performed to estabilish gene marker and elucidate lactose utilization system of Lactobacillus casei YIT 9018. Lactose negative mutants(lac) were isolated by curing agent such as acriflavin(20 ㎍/ml), acridine orange(80 ㎍/ml), ethidium bromide(10 ㎍/ml) and elevated temperature(42℃). Frequencies of lac mutants of L. casei YIT 9018 on these curing agents were 3.03, 1.41, 3.22 and 0.35%, respectively. The lactose negative mutants isolated had no ability of lactose utilization. L. casei YIT 9018 was found to have one plasmid of approxymately 45 Mdal, which was lost readily by curing agent and its ability to utilize lactose was lost silmultaneously.