• 한국응용곤충학회지
• /
• 제5_6권
• /
• pp.65-69
• /
• 1968

본 실험에 있어서는 phenylmercuric acetate에 못지 않은 살균력을 나타낸다고 보고된 phenylemercuric 8-oxyquinolinate를 phenylmercuric acetate 와 대비시켜 벼 고마엽고병균 에 대하여 먼저 균체의 건물량에 의한 균사발육 효과를 확인하고 포자 및 균사의 호흡 저해효과를 검토한 바 그 결과를 보고하는 바이다. (1) 균사발육 억제효과를 보면 phenylmercuric 8-oxyquinolinate는 phenylmercuric acetate보다 약간 떨어지나 현저한 차이는 없으며, 양자 모두 0.01ppm부터 1.0ppm까지의 사이에서 급격히 발육 억제효과가 증가한다. (2) 포자효흡 저해작용은 0.1ppm을 제외하고는 phenylmercuric acetate가 phenylmercuric 8-oxyquinolinate보다 약간 강하나 뚜렷한 차이는 인정할 수 없으며 0.01ppm에서는 거의 저해효과가 없는 듯하다. (3) 균사호흡 저해작용은 포자호흡과는 반대로 phenylmercuric 8-oxyquinolinate 가 phenylmercuric acctate 보다 강하며, 또한 그 차도 커서 약 $10\%$쯤 된다. (4) 이상의 결과로 미루어 보아 phenylmercuric 8-oxyquinolinate의 포자발아 억제효과는 phenylmercuric acetate와 동정도이거나 약간 높으며, 균사발육 억제효과는 phenylmercuric acetate보다 낮음이 명백하다.

• Preventive Nutrition and Food Science
• /
• 제10권2호
• /
• pp.130-133
• /
• 2005

The growth inhibitiory effect of chaff vinegar against various food-borne pathogenic bacteria was evaluated. Bacterial growth was evaluated in chaff vinegar at concentrations of 15, 30, 50, 65, 80, and $100\%$ using the paper disc diffusion method and 0.5, 1.0, 1.5, 1.8, 2.0, 2.2 and $2.5\%$ in broth. In the paper disc diffusion assay, chaff vinegar showed a clear zone on both the Gram-positive bacteria; Listeria monocytogenes, Staphylococcus aureus and Gram-negative bacteria; Escherichia coli O157:H7, Salmonella Typhimurium, and Vibrio parahaemolyticus. Chaff vinegar exhibited the greatest growth inhibition for V. parahaemolyticus. The bactericidal effect of chaff vinegar on the E. coli O157:H7 was tested at concentrations ranging from 0.5 to $2.5\%$ (v/v) in the LB broth media. Chaff vinegar retarded the lag phase time of the growth curve in proportion in a concentration-dependent manner. Chaff vinegar at $2.5\%$ completely inhibited the growth of E. coli O157:H7.

• 환경위생공학
• /
• 제19권3호
• /
• pp.22-30
• /
• 2004

The extract with the dilution of $50\%$ ethanol and treatment of $121^{\circ}C$ for 15min were inhibited highly the growth of staph aureus, Ent. cloacae, Sh. sonnei, A. hydrophila, b. subtilis, St. faecalis and L. casei. of food samples, red-bean dregs with addition of extact of smilax china. leaves or sorbic acid took the similar inhibition effect to microorganisms for the early storage days(1-3days). There was inhibited the growth of microorganisms in strawberry Juice added to 20m1 of $1\%$ extract solution for one storage day in comparison with no addition of smilax china L. Over all with growth inhibition capability to microorganisms and foods, it was believed that the effect and value as the natural food preservatives and the extracts like as this natural plant material took the food safety and it was capable to develop the natural food preservation.

• 한국작물학회지
• /
• 제45권2호
• /
• pp.134-138
• /
• 2000

Most parts of alfalfa plant have been reported to contain autotoxic substances that inhibit seed germination and early seedling growth, however, the chemical(s) is not still studied much. Effect of seed leachates of 'Vernal' alfalfa (Medicago sativa L.) was evaluated for inhibition of alfalfa germination and root growth through bioassay. Alfalfa seeds were extracted in 1 L deionized water for 1 h after soaking and the leachates caused to reduce root length of alfalfa significantly as the soaking time increased. Crude seeds at 4 g L$L^{-1}$ exudated autotoxins that reduce significantly root length by 34 % compared to the control, when the seeds soaked in deionized water for 24 h. However, the extracts did not affect final germination as well as speed of germination. Extracts from ground seeds significantly reduced speed of germination (GT 50) and root length. The results indicate that release of autotoxic substances from seeds during seed imbibition was increased with increase of soaking time and seed amount, and that autotoxicity was more occurred in ground seeds than in crude seeds.

• 한국잡초학회지
• /
• 제17권2호
• /
• pp.207-213
• /
• 1997

단일식물인 수수의 개화에 지베렐린이 관여하는지를 조사하기 위하여 지베렐린 생합성 억제제인 ancymidol을 처리한후 내생 지베렐린의 함량과 개화 및 생육에 미치는 영향을 조사한 결과는 다음과 같다. 1. 지베렐린 생합성 억제제 ancymidol은 공시한 두 품종 모두의 생육을 억제함과 동시에 개화를 지연시켰다. 2. $GA_3$를 Ancymidol과 동시에 처리할 경우 생육억제와 개화지연이 모두 회복되어 지베렐린이 수수의 개화에 관여함을 보였다. 3. Ancymidol 10ppm은 수수의 모든 지베렐린 ($GA_{12}$, $GA_{53}$, $GA_{44}$, $GA_{19}$, $GA_{20}$, $GA_1$ 합성을 현저히 억제하였다.

• 한국치위생학회지
• /
• 제15권4호
• /
• pp.735-741
• /
• 2015

Objectives: Lentinus edodes is an edible mushroom with a variety of beneficial effects such as antitumor, anti-inflammatory, antioxidant, and immune-modulatory activity. This study was carried out to evaluate the antimicrobial activities of Lentinus edodes extracts against oral-related bacteria. Methods: The antimicrobial activities of this extracts were investigated against S. anginosus, S. sobrinus, S. aureus, S. mutans, S. ratti, S. sanguinis, A. viscosus, A. naeslundii, and A. actinomycetemcomitans by the disc diffusion method, minimum inhibitory concentration (MIC), and growth inhibition. Results: Ethanol extracts had no antimicrobial activities, but acetone extracts showed antimicrobial activities against A. viscosus and A. actinomycetemcomitans and ethyl acetate extracts had effects against S. aureus, S. sanguinis, A. viscosus, and A. actinomycetemcomitans. Conclusions: The inhibitory effect of Lentinus edodes extracts was investigated on the growth of A. viscosus. Ethyl acetate and acetone extracts showed 90% and 77% inhibitory effect, respectively, against A. viscosus for 24 hrs. Ethyl acetate extracts had MIC of 25.0 mg/ml and acetone extracts showed MIC of >25.0 mg/ml.

• Mycobiology
• /
• 제31권4호
• /
• pp.251-254
• /
• 2003

To select active bacterial strains to control plant diseases, 57 bacterial strains were isolated from the rhizosphere of the plants growing in various areas such as coast, middle and top of Halla Mountain in Jeju Island. Anti-fungal effect of isolated bactrial strains was tested in vitro by incubating in potato dextrose agar with isolates of four fungal plant pathogens Rhizoctonia solani, Fusarium oxysporum, Colletotrichum gloeosporioides and C. orbiculare, respectively. Thirty-four bacterial strains inhibited the hyphal growth of the plant pathogens, from which 17 strains inhibited one of the tested fungi, 10 strains two fungi, six strains three and a strain TRL2-3 inhibited all of the tested fungi. Some bacterial strains could inhibit weakly the hyphal growth of the plant pathogens, whereas some did very strongly with apparent inhibition zone between the plant pathogens and bacterial strains indicating the unfavorable condition for hyphal growth. Although there was no apparent inhibition zone, some bacterial strains showed a strong suppression of hyphal growth of plant pathogens. Especially, the inhibition by TRL2-3 was remarkably strong in all cases of the tested plant pathogens in this study that could be a possible candidate for biological control of various plant diseases.

• 동의생리병리학회지
• /
• 제21권4호
• /
• pp.992-997
• /
• 2007

Cisplatin is a chemotherapeutic drug which is widely used for cancer therapy including cervical cancer. The purpose of this study is to elucidate synergistic effect of Cisplatin and Berberine on the apoptosis of HeLa cells and to determine whether oxidants are formed as part of apoptotic process. Apoptotic death of HeLa cells by cisplatin and berberine was confirmed by chromatin condensation of HeLa cells and flow cytometric analysis of intracellular ROS(reactive oxygen species) production. In MTT assay, Cell viability was decreased and enhanced ROS generation in combination of cisplatin and berberine significantly, as compared with cisplatin only. Synergistic effect of Cisplatin and Berberine on the inhibition of cell growth by apoptosis was clearly observed and ROS may play an important role in apoptosis. This effect suggest the possibility lowering the concentration of chemotherapeutic drugs, which alleviate the side effect of drugs.

• Archives of Pharmacal Research
• /
• 제20권3호
• /
• pp.275-279
• /
• 1997

Helicobacter pylori (H. pylorl) infection is now established as the major pathogenic factor in chronic gastritis and peptic ulcer disease. in addition, there is accumulating evidence that H. pylori plays an important role in the process of gastric carcinogenesis. On the other hand, oriental traditional medicines have been used for stomach disease for thousands of years. In the present study, methanol extract from the stem bark of Magnolia sieboldii (M. sieboldii) and its components were investigated on their inhibitory effects against urease activity and growth of H. pylori in vitro. The methanol extract of M. sieboldii significantly inhibited the growth of H. pylori ATCC 43504 at 5 mg/ml. From the further fractionation, the chloroform fraction inhibited the bacterial growth dose-dependently. Among four fractions separated from the chloroform fraction by silica gel column chromatography, MS-C-2 was the most potent. Costunolide was isolated from the MS-C-2 subtraction by preparative TLC and recrystallization using n-hexane. Anti-H. pylori effect of costunolide was investigated using one commercial strain (H. pylori ATCC 43504) and three clinical strains (H. pylon 4, 43, 82548). Costunolide exhibited potent anti-H. pylori activity, and the MIC was around $100-200{\mu}g/ml$. However, costunolide had no inhibitory effect of H. pylori urease activity at the concentration used for the growth inhibition assay. From these results, we conclude that costunolide inhibits the, growth of H. pylori by the independent manner of H. pylori urease inhibition.

• 한국환경성돌연변이발암원학회지
• /
• 제24권2호
• /
• pp.51-66
• /
• 2004

Retinoids, better known as vitamin A, have been reported to inhibit the growth of several breast cancer cell lines in culture and to reduce breast tumor growth in animal models. Furthermore, retinoids can augment the action of other breast cancer cell growth inhibitors both in vitro and in vivo. Clinically, interest has increased in the potential use of retinoids for the prevention and treatment of human breast cancer. We have examine the effect of all-trans retinoic acid(tRA) and 9-cis retinoic acid(9-cis RA) on human breast cancer cell(MCF-10A, T47-D, MCF-7) proliferation using MTT assay and cell cycle analysis(FACS). Overexpression of cyclin D1 protein is observed in the majority of breast cancers, suggesting that dysregulated expression of cyclin D1 might be a critical event in breast cancer carcinogenesis. We investigated whether tRA and 9-cis RA might affect expression of cyclin D1 on human breast cancer cells(MCF-10A, T47-D, MCF-7) using RT-PCR and west-ern bolt. In MCF-10A cells, either tRA or 9-cis RA treatment did not affect the cell proliferation. In T47-D cells and MCF-7 cells, either tRA or 9-cis RA treatment showed the inhibition of the cell proliferation over control cells and also inhibit the estrogen stimulated cell proliferation when it was given together with estrogen. The effect of retinoids was dose- and time- dependent. T47-D cells treated with 1.0 $\muM$ tRA undergo G0/G1-phase arrest by Day 5. MCF-7 cells treated with 1.0 $\muM$ tRA undergo S-phase arrest by Day 5. All-trans retinoic acid(tRA) and 9-cis retinoic acid(9-cis RA) inhibited the cyelin D1 mRNA and protein expression levels of human MCF-7 and T47-D breast carcinoma cells in vitro. The data indicate that retinoids can reduce cyclin D1 expression levels in a variety of breast cell lines in vitro and result in inhibition of cell proliferation. tRA-mediated growth inhibition and cyclin D1 expression inhibition is more potent than 9-cis RA mediated that. tRA-mediated inhibition effect is more potent on T47-D cells than on MCF-7 cells. Our data suggest that retinoids activity is different according to property of cell lines. Future chemoprevention of breast cancer studies using retinoids will be necessary to determine the mechanism of the retinoids-mediated growth inhibition.