• 미생물학회지
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• 제18권3호
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• pp.148-152
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• 1980

The microwave of 2450 MHz, generated by a household cooking oven, was evaluated for its applicability to melt various rehydrated media and to remove dissolved oxygen from tubed media for anaerobic culture. The effect on the sterilization of E. coli in selective media was also evaluated. The following results were obtained. 10 The microwave oven was useful in saving time for melting media and in eliminating heat and combustion gas from the laboratory, which were inevitable by-products in the conventional flame method. 2) Dissolved oxygen could be removed without boiling over by exposing the tubes of anaerobic culture medium after putting them in a wire basket in a beaker with water. 30 The count of E. coli during the melting of MacConkey and EMB agar were similar to those treated with open flame. The microwave treatment was not considered a possible mean to replace autoclaving even in these selective media.

• Journal of Ginseng Research
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• 제26권3호
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• pp.151-158
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• 2002

Ginseng (Panax quinquefolius L.) has become one of the most valuable herb crops grown in North America. However, traditional cropping practices are favourable to disease and significant losses due to root disease are common, despite frequent use of fungicides. Seedlots are often contaminated with pathogens, however, little is known about the causes of seed decay and the role of seed pathogens as incitants of root rots. It was shown that both Fusarium spp. and Cylindrocarpon destructans were able to rot seeds and that C. destructans was more virulent than Fusarium spp. on seedling roots. A modified rose bengal agar MRBA) medium (1 g KH$_2$PO$_4$; 0.5 g MgSO$_4$; 50 mg rose bengal; 10 g dextrose; 5 g Bacto peptone; 15 g Bacto agar; 30 mg streptomycin sulfate; 250 mg ampicillin; 10 mg rifampicin; 500mg pentachloronitrobenzene; 500 mg dicloran; and 1 L distilled water) was superior to potato dextrose agar in detecting C. destuctans in diseased roots. Isolation of C. destructans from diseased seedlings arising from seeds sown in replant soil supported the hypothesis that this pathogen is a cause of ginseng replant failure in North America.

• 방사선산업학회지
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• 제11권1호
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• pp.1-6
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• 2017

Reported some level of bacteria in areas that are well made contact in Radiology imaging room evaluate the importance of cleanliness in the hospital management of equipment to check for the presence of pathogenic bacteria. Gwang-ju and Jeol-la city and medium-sized hospitals in the material with a cotton swab and rub evenly Radiology selection cassette, a handle, Apron of the imaging apparatus having the most contact with patients from July 2016 to August 2016 as a target in place and special studios 6, and saline solution will placed in a test tube containing. The swab sample was diluted 1,000 times, you can see the bacteria and the intestinal bacterial selective medium Trypticase Soy Agar (TSA), Muller-Hinton Agar (MHA), Eosin-Methylene Blue (EMB), ENDO(BD, NJ, USA) then incubated smear to. In the incubator (incubator, SANYO, Japan) was observed after incubation of bacteria and counting the total number of bacteria also Colonies (colony) suspected intestinal bacteria were isolated and cultured on KIA medium (BD, NJ, USA). As a result, it was found that this came Gram positive Coccus A hospital handle the F hospital, from the C Gram positive Coccus cassette and handle the F hospital. The striking yellow coloring Staphylococcus aureus 110 agar (STA 110) in the medium sample, but it is suspected staphylococcal Coccus to the final identification in the laboratory is not a single specimen of the two samples from Gram positive Coccus biochemical identification Identification Kit is an API could not, it was thought to be non-Staphylococcus aureus was cultured on blood agar suggesting that (BAP) blood of dance. Dynamic tests were conducted biochemical API kit of the two samples were identified from Gram positive Coccus bacteria Escherichia coli (E. coli) is F hospital cassette was confirmed Eenterobacter cloaca in A hospital possession. Did not aggregate O-26, O-111, O-157 and the serum test was conducted in the laboratory from the E. coli F cassette hospital.

• 한국식물병리학회지
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• 제14권6호
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• pp.583-588
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• 1998

This study was conducted to investigate the potential of nitrate-nonutilizing mutants (nit mutants) in ecological studies of Fusarium disease of strawberry. Nit mutants of Fusarium oxysporum from strawberry were easily formed on chlorate-containing media. Nit mutants were assigned to three phenotypic classes, nit1, nit3, and NitM, on the basis of their growth on media containing one of the following five different nitrogen sources ; nitrate, nitrite, hypoxanthine, ammonium and uric acid. Frequency of nit mutation and proportion of three phenotypes of nit mutants depended on the isolate. Mutation rate was 45.6% and ranged from 15.0% to 95.0%. The frequency of nit1 mutants was higher than that of nit3 or NitM. The complementary reaction between nit1 and NitM was higher than that of other combination. There has been no complementary response observed between nit3 and nit3. The nit mutants showed similar growth pattern as the that of wild type isolate on potato sucrose agar and potato sucrose liquid media. Most of the mutants retained pathogenicity, and maintained their phenotypes even after two year preservation through subculture on slanted PSA at room temperature. Nit mutants were selctively isolated from infested soil and infected plants on the selective medium (MMCPA) containing potassium chlorate with their original phenotypes, while naturally occurring isolates of Fusarium oxysporum were not grow on the medium. On the contrary, nit mutants showed very slight growth on the medium (MMPA) containing nitrate as a sole nitrogen source, and therefore could be distinguished from wild type isolate.

• 한국미생물·생명공학회지
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• 제12권4호
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• pp.305-309
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• 1984

섬유소 분해능이 있는 bacteria를 분리 동정하거나 유전자 재조합에 의한 형질 전환주중에서 이 분해능을 갖는 재조합주를 신속하고도 착실하게 분리해내는 일은, 섬유소 분해능을 가진 유전자를 복제 및 발현시키려는데 있어서 일차적인 조건이 된다. 한정된 양(0.005%)의 yeast ext를 함유한 기본배지에 0.5%의 CMC를 첨가 시킴으로써, 오직 섬유소 분해능이 있는 bacteria만을 분리할 수 있었고, 뒤이은 Congo red dye처리에 의해 세포벽 밖으로 분비 가능한 섬유소 분해효소를 생산하는 bacteria를 다시 구별해낼 수 있었다. 한편, 개발된 CMC 기본배지는 CMC대신 다른 탄소원 중합체를 대치시킴으로써, 다른 종류의 탄수화물 분해능을 갖는 bacteria도 쉽게 분리해 낼 수 있음을 알 수 있었다.

• Journal of Microbiology
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• 제39권3호
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• pp.202-205
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• 2001

The EF-18 agar/hydrophobic grid membrane filter (EF18/HGMF) method was evaluated for the isolation of Salmonella in naturally contaminated chicken carcasses, chicken parts (legs, wings and giblets) and processed chicken products (sausages and hamburgers). Percentages of false positive results for Salmonella (colonies with a similar morphology to those of Salmonella) were 78.75, 81.67 and 80% for carcasses, chicken parts and processed chicken products, respectively. The bacterial isolates that caused false positive reactions using this method were identified as Proteus mirabilis (70.85%), Citrobacter freundii (15.25%), Klebsiella ozaenae (5.83%), Hafnia alvei (4.48%), Escherichia coli (2.69%) and Enterobacter aerogenes (0.90%). The data obtained in this study suggest that the EF-18/HGMF method is not sufficiently selective or specific far isolating Salmonella from meat and chicken products.

• The Plant Pathology Journal
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• 제19권6호
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• pp.280-283
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• 2003

A soybean-sprout rot epidemic occurred in a mass production soybean sprout factory in 2000 and 2001 in Korea, which caused up to 20% production loss. Among the causal pathogenic bacteria and fungi, Pythium deliense was found to be the dominant pathogen of severe root and hypocotyls rot, particularly in recirculating water system. An average of 90% of the isolated fungi from the rotted sprout on potato dextrose agar were Pythium sp. The fungal density of Pythium in the sampled water was monitored in the recycled water system for 1 year using a selective medium (com meal agar with Pimaricin, 10 mg； Rifampicin, 10 mg； and Ampicillin, 100 mg per 1 liter). The drained water from the soybean-sprout cultivation always had a certain amount of fungus in it. The removal of Pythium from the recycling water system must be thorough, safe, and environment friendly. However, the pathogen in the water was easily found even after ozone and chlorine treatments, which were devised on the recycling system for the removal of microorganisms. 5-$\mu\textrm{m}$ pore size filter was applied and was able to successfully control the disease. As the sprout industry increasingly shifts into mass production, the demand for water will increase continuously. Recycling water for sprout production is eco-friendly. However, a process must be devised to be able to first decompose organic matters before Pythium zoospores are filtered.

• Journal of Microbiology
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• 제39권4호
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• pp.321-325
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• 2001

Baird-Parker agar with egg yolk/tellurite emulsion (BPA) is widely accepted as a medium for the enu-meration of Staphylococcus aureus in foods. Howerver, it is not vompletely selective and colonies of other genera of species could be similar to those of Staphylococcus aureus. Moreover, the strains of Staphylococcus aureus that are lecithinase negatrive could go unnoticed. Both facts could affect the counts. The aim of this study was to dtermine whether the enumeration of the colonies with the typical morphol-ogy of Staphylococcus aureus on BPA is sufficien to quantity this species in poultry meat. Forty chiken carcasses were tested for Staphylococcus aureus by surface plating using BPA, Results indicate that the predictiv value of the morphoogy of the colonies of BPA is 85.71% and 68.42% for typical and atypical colonies of Staphylococcus aureus, respectively. However, Staphylococcus aureus counts (after identification) and counts of typical colonies did not show any significant differences(P>0.05) and are significantly(P<0.001) correlated (r=0.996).These results suggest that , for screening purposes. enumeration of Staphylococcus aureus from poultry meat does not require any identification of stains. resulting in a saving of time and money.

• 한국축산식품학회지
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• 제30권2호
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• pp.179-184
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• 2010

Escherichia coli O157:H7 is a food-borne pathogen that causes bloody diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome (HUS). We compared three selective media and evaluated the performance of immunomagnetic separation (IMS) for the detection of low levels of E. coli O157:H7 in ground beef and radish sprouts with different levels of background flora. Bulk food samples (500 g for each trial) were artificially inoculated with nalidixic acid-resistant E. coli O157:H7 at the lowest dose that would generate 20 partial-positive samples of 25 g each. All samples were homogenized in mTSB (225 mL) and incubated overnight at $37^{\circ}C$. IMS was performed using the enriched mTSB samples (1 mL) along with conventional spreads plated onto three different selective media: Sorbitol MacConkey agar (SMAC), Sorbitol MacConkey agar with cefixime and tellulite (CT-SMAC), and Sorbitol MacConkey agar with nalidixic acid (NAL-SMAC) as the gold standard. Two suspicious colonies from each medium were selected and confirmed usinga serological test after transfer to tryptic soy broth with yeast extract (TSAYE). CT-SMAC was better than SMAC for detecting E. coli O157:H7 in all food types. Although there was no statistical difference in the number of positive samples when using IMS vs. non-IMS techniques, more positive samples were detected when IMS was used in both ground beef and radish sprouts. It appears that the improvement was more significant in radish sprouts, which had a higher level of background flora than ground beef. The results also suggest that the combination of CT-SMAC and IMS is sufficient to recover low levels of E. coli O157:H7 in high background flora food samples.

• 한국약용작물학회지
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• 제10권3호
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• pp.155-161
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• 2002

본 연구 결과 2000년 지역적으로 재배적 환경이 다른 수원, 안동, 영주의 백출 재배 포장에서 발생한 이병주들과 토양 시료로부터 SS-배지와 Jee-배지를 이용하여 분리된 균들은 백출 역병의 원인균인 P. drechsleri로 확인되었다. 이들 분리균 들은 격막이 없는 다량의 팽윤균사를 형성하며, 10% V8A 배지에 배양한 경우 PDA배지에 배양한 경우보다 빠른 균생장 속도를 보이며 $5^{\circ}C$이하와 $40^{\circ}C$이상에서는 전혀 균 생장이 이루어지지 않았다. 10% V8A 배지에서 균을 배양한 후 멸균수와 함께 균질화한 균사-유주자 현탁액을 접종원으로 하여 다량의 유묘에 접종한 결과 $5.0%{\sim}26.4%$와 $23.5%{\sim}72.2%$로 다양한 병반율과 이병주율이 확인되어 효과적인 병원성 검정이 이루어 졌다. 안동지역의 토양시료로부터 분리된 P-A200073 균주와 수원지역의 이병주 뿌리로부터 분리된 P-9755가 병원성이 높아 각각 $26.4%{\sim}63.2%$와 $25.1%{\sim}72.2%$의 병반율과 이병주율을 보였으나 무처리구의 경우 이병주가 발생하지 않았다. 접종 이병주의 조직으로부터 균 재 분리를 시도한 결과 대부분의 뿌리와 땅 가줄기에서 P. drechsleri가 분리되었으나 병반을 보이는 상위 줄기와 엽 조직으로부터는 균이 분리되지 않았다.