• 한국식품영양과학회지
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• 제38권12호
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• pp.1633-1639
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• 2009

열풍건조 마늘 및 홍삼 추출물과 혼합물의 생리활성을 평가하고자 마늘 열수추출물에 홍삼 열수추출물을 5-15%(v/v) 첨가한 혼합물을 제조하여 500-10,000 $\mu$g/mL 농도에서 항산화활성, tyrosinase 및 glucosidase 저해활성, 위암 및 대장암 세포에 대한 생육저해 활성을 실험하였다. 열풍건조 마늘과 홍삼 추출물의 전자공여능은 1,000 $\mu$g/mL 이하의 농도에서는 15% 미만으로 낮았으나, 이들의 혼합물의 경우 38% 이상의 높은 활성을 나타내었다. 2,500 $\mu$g/mL 이상의 농도에서 아질산염 소거능은 열풍건조 마늘 추출물에서 가장 높고 다음으로 홍삼 추출물 15% 첨가군, 10% 첨가군의 순이었다. Tyrosinase 저해활성은 10,000 $\mu$g/mL 농도에서 열풍건조 마늘은 29.56%, 홍삼 추출물은 34.59%이던 것이 이들의 혼합물에서는 그 활성이 급격히 저하하여 15% 미만이었다. $\alpha$-Glucosidase 저해활성은 열풍건조 마늘 추출물에서 더 높아 10,000 $\mu$g/mL 농도에서 22.22%였고, 동일농도에서 홍삼 추출물의 경우 13.84%, 이들의 15% 혼합물에서 활성은 25.27%로 유의적으로 증가하였다. AGS 세포 성장억제능은 시료의 첨가농도가 증가함에 따라 유의적으로 증가하였으며 열풍건조 마늘이나 홍삼 단독 추출액에 비하여 이들의 혼합 시료에서 더 활성이 높았다. HT-29 세포의 성장도 시료의 첨가 농도에 의존적으로 억제되었는데, 1,000 $\mu$g/mL 농도에서 열풍건조 마늘과 홍삼 추출물의 암세포 성장억제능은 50% 이상이었으나 이들의 혼합물의 경우 활성이 저하하여 28.25-39.62%에 불과하였다.

• The Korean Journal of Ecology
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• 제20권4호
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• pp.245-250
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• 1997

The seeds and callus induced from the root of Glycine max were used as test materials. When the seed was treated with the different concentrations of Pinus rigida extract, there was a more striking inhibition of seedling growth than of seed germination. The callus of the control group was in good condition, but when treated with 5% extract there was generalized browning and cell division was decreased in the upper part of the callus. There was no difference in the fresh and dry weights in 2% extract treatment but there was dramatic repression at concentrations higher than 5%. The band activity of peroxidase isozyme in treated callus was elevated, while that of esterase was inhibited.

• 한국환경보건학회지
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• 제22권4호
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• pp.109-121
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• 1996

It was intended to investigate the effect of the microbiological kitchen hygiene such as dishclothes and scrubbers. The 8indicator organisms (standard plate counts, coliform, heterotroph, enterococcus, staphylococcus, heat-stable bacteria, psychrotroph, Pseudomonas aeruginosa) were detected highly in dishwaters, dishcloth and scrubber. Coliform and Staphylococcus aureus were appeared on dishcloth dominantly than the scrubber, and the scrubbers were intruded by hetrotrophs and psychrotrophs numerously than dishclothes. The germ-resistant sponge inhibited the growth of the most of test strain, and appeared the about 100% reduction rate after 24 hr, but did not affect Pseudomonas aeruginosa and P. fragi so typically after 24 hr. The anti-microorganism durability of germ-resistant sponge, treated with food soil, was maintained by 10 days, the early stage strain density was founded in 20 days, and the strains grew after 30 days.

• 미생물학회지
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• 제51권4호
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• pp.448-452
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• 2015

효모의 생육을 억제하는 세균을 배추의 근권 토양에서 분리하였다. API 20NE test와 16S rRNA 유전자 염기서열 분석 결과 Pseudomonas fluorescens BB2로 동정되었다. P. fluorescens BB2 균주는 3%의 glucose가 포함된 YM 배지에서 $20^{\circ}C$로 배양하였을 때 효모에 대한 항생물질을 2차 대사산물로서 효과적으로 생산하였다. BB2 균주의 단백질성 항생물질은 ammonium sulfate에 의한 침전과 N-butanol 추출에 의해 농축되었으며, 효모의 생육을 억제하는데 Candida albicans KCTC 7965에 대한 minimal inhibitory concentration은 $10{\mu}g/ml$이었고, $80{\mu}g/ml$ 농도에서는 완전히 억제하였다. N-butanol 추출에 의한 친수성 분획은 Bacillus cereus ATCC 21366의 생육을 억제하였으며, chrome azurol S 평판배지에서 주황색 halo를 생성하므로 철과 결합하는 siderophore를 포함한다. 세포막을 통한 crystal violet의 흡수를 조사한 결과 효모 C. albicans에 대한 소수성 항생물질 $60{\mu}g/ml$의 농도에서는 대조군에 비해 막 투과성이 약 9% 증가하였다. P. fluorescens BB2 균주가 생산하는 항생물질은 효모 Candida의 생육을 억제하는 antimicrobial peptide의 일종으로 보이며, 이는 Pseudomonas 속에서는 처음으로 보고되는 것이다.

• 한국미생물·생명공학회지
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• 제32권4호
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• pp.341-346
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• 2004

Escherichia coli의 생장을 저해하는 중금속(Cu, Cd, Cr, Hg, Zn) 영향을 정량적으로 조사하였고, 중금속 독성에 대한 적응과정에서의 독성변화를 노출시간대별로 평가하였다. 중금속에 의한 E. coli의 생장저해 작용은 중금속의 종류에 따라 다른 동향을 보였고, 생장을 완전 저해하는 중금속의 농도는 각각 Cu 3.5mM, Zn 2.5mM, Cd 1.5mM, Cr 1.2mM, Hg 0.12mM 이었다. $EC_{50}$을 기준으로 한 E. coli의 중금속에 대한 내성은 Cu > Zn > Cr > Cd > Hg 순이다. 노출 시간에 따른 $EC_{50}$의 변화를 plotting하여 그 기울기에 따라 피시험체의 독성물질에 대한 적응성 평가가 가능함을 보였다. 기울기 값이 작은 경우에는 피검사체가 독성물질에 대한 적응성이 약하고, 기울기 값이 크면 클수록 피시험체가 독성물질에 대한 적응성이 우수하다는 것을 의미한다. E. coli의 독성물질인 중금속에 대한 적응성은 Zn > Cd > Cu >> Cr > Hg 순 이었다.

• 한국식품과학회지
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• 제33권2호
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• pp.252-255
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• 2001

뽕잎 분말이 1, 10%가 되도록 사료에 첨가시켜 4주동안 SD 흰쥐에게 급여한 후 이들의 대장 내용물로부터 총균수와 주요장내미생물의 생균수를 배지를 이용하여 혐기배양한 후 측정한 결과 총균수는 뽕잎 투여군에서 대조군에 비해 감소하는 경향을 보였다. 그리고 유해균으로 분류할 수 있는 Clostridium은 대조군보다 뽕잎투여군에서 유의성있게 감소하였고, E. coli와 Staphylococcus도 감소하는 경향을 보였다. 뽕잎 메탄올 추출물과 분획물들의 미생물의 생장억제효과를 측정한 결과, 헥산분획과 물분획물이 Clostridium perfringens에 대하여 억제효과를 보였다. 장내균총의 개선 측면에서 뽕잎은 기능성 식품소재로서의 이용가능성이 있는 것으로 나타났다.

• Journal of Applied Biological Chemistry
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• 제44권4호
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• pp.185-189
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• 2001

Essential oils of 21 herb plant samples, using spectrophotometric and paper disc agar diffusion methods under anaerobic conditions, were tested in vitro for their growth-inhibiting activities against Bifidobacterium bifidum, B. longum, Lactobacillus casei, Clostridium perfringens, and Escherichia coli. The responses varied with bacterial strains and plant oils. At 10 mg/disk, all essential oils did not inhibit beneficial intestinal bacteria, except for the oil of Alpinia officinarum and Melaleuca alternifolia against L. casei. Due to their strong growth-inhibitory activities against C. perfringens, E. coli, and L. casei, the activites of nine oils were evaluated at low concentrations. In test with C. perfringens at 1 mg/disk, the oils of Amyris balsamifera, Curcuma longa, M. alternifolia, and Trachyspermum ammi showed moderate activities. Moderate activities against E. coli were observed with the oils of M. alternifolia and T. ammi. These results may be indications of at least one of the pharmacological actions of the four herb plants.

• 한국환경농학회지
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• 제25권3호
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• pp.268-275
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• 2006

ALA (5-aminolevulinic acid) has been proposed as a tetrapyrrole-dependent photodynamic herbicide by the action of the protoporphyrinogen IX oxidase (Protox IX). A study was conducted to determine photodynamic herbicidal effect of ALA on seedling growth of rice (Oryza sativa L.) and barnyard grass (Echinochloa crus-galli Beauv. var. oryzicola Ohwi) under dry and wet conditions. ALA effect on early plant growth of rice and barnyardgrass was greatly concentration dependant, suggesting that it promotes plant growth at very low concentration and inhibits at high concentration. No significant difference in herbicidal activity of biologically and synthetically produced ALAs on plant lengths of test plants was observed ALA exhibited significant photodynamic activity regardless of PSDIP and its duration. Significant shoot growth inhibition by ALA soaking treatment exhibited apparently, indicating that ALA absorbed through root system was translocated into shoot part of plants. ALA reduced plant heights of rice and barnyardgrass seedlings by 6% and 27%, respectively, showing more tolerant to ALA in rice under wet condition. Leaf thickness was reduced markedly by ALA with increasing of ALA concentration, due to mainly membrane destruction and severe loss of turgidity in mesophyll cells, although the epidermal was little affected. It was observed that photodynamic herbicidal activity of ALA applied by pre-and post-emergence application exhibited differently on plant species, and that the activity of ALA against susceptible plants was highly correlated with growing condition.

• 한국식품영양과학회지
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• 제24권2호
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• pp.305-312
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• 1995

Ixeris dentata was extracted with methanol and then the methanol extract was further fractionated to hexane, chloroform, ethyl acetate, butanol and aqueous fraction. The methanol extract of lxeris dentata had the strong antimutagenic effect on the aflatoxin B1(AFB1) and N-methyl-N'-nitro-N-nitrosoguanidine(MNNG) in Ames mutagenicity test and SOS chromotest. Among the solvent extracted fractions from the methanol extract, the chloroform fraction exhibited the greatest antimutagenic effect suppressing the mutagenicity of AFB1 with inhibition rate of 74 percent. The methanol extract of Ixeris dentata also revealed the inhibitory effect on the growth of MG-63 human osteosarcoma cells after 6 days of breeding at 37℃. The chloroform fraction and the ethyl acetate fraction from the methanol extract of lxeris dentata were most effective and inhibited the growth of MG-63 cells by 97 and 93 percent, respectively. It is suggested that the inhibitory effects of lxeris dentata on the mutagenicity and the growth of MG-63 human osteosarcoma cells are strong in the lipid soluble fractions.

• 상하수도학회지
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• 제30권6호
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• pp.715-723
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• 2016

This study investigated the effect of high concentration of free ammonia on microalgal growth and substrate removal by applying real wastewater nitrogen ratio. To test of this, the conditions of free ammonia 1, 3, 6, 9, 12, 15 mg-N/L are compared. After 3 days of incubation, algal growth of Chlorella vulgaris and carbon removal rate are respectively lower in the reactors of FA 12, 15 mg-N/L compared to the others. This indicates that the high concentration of free ammonia, in this case, above 12 mg-N/L, has negative effect on algal growth and metabolic activity. Also, high concentration of free ammonia causes the proton imbalance, ammonium accumulation in algae and has toxicity for these reasons. So, we have to consider free ammonia in applying the microalgae to wastewater treatment system by the way of diluting wastewater or controlling pH and temperature.