• 농업과학연구
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• 제19권1호
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• pp.40-50
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• 1992

산효유제품(酸酵乳製品) 제조시(製造時) 유산균(乳酸菌) Starter의 산효성(酸酵性)을 촉진(促進)하기 위한 기초연구(基礎硏究)로서 Bulk medium에 Bios 2000, CR starter medium 및 Yeast extract를 각각(各各) 1.5%씩첨가(添加)하고 Lac. bulgaricus, Str. thermophilus 및 Lac. casei를 접종(接種) 배양(培養)하고 산도(酸度), pH 및 유산균수(乳酸菌數)의 변화(變化)를 조사(調査)한 결과(結果)는 다음과 같다. 1. Lactobacillus bulgaricus의 배양(培養)중 산(酸) 생성도(生成度)는 Control구(區)는 배양(培養) 16시간(時間)에 0.99%에 이르렀는데 비하여, CR starter mediurn 첨가구(添加區)는 배양(培養) 12시간(時間)에 1.0%이었고, Yeast extract 첨가구(添加區)는 배양(培養) 12시간(時間)에 1.12% 이였으며, Bios 200첨가구(添加區)는 배양(培養) 10시간(時間)만에 0.97%로써 가장 빠른 산생성도(酸生成度)를 보였다. 2. Lac bulgaricus의 배양(培養)중 pH의 변화(變化)는 Control구(區)는 배양(培養) 16시간(時間)에 4.03이였는데 반하여 Bios 2000 첨가구(添加區)는 배양(培養) 10시간(時間)에 4.10에 이르렀다. 또한, Yeast extract 첨가구(添加區)는 배양(培養) 12시간(時間)에 3.97, CR starter medium 첨가구(添加區)는 배양(培養) 12시간(時間)에 4.05를 나타내었다. 3. Lac. bulgaricus의 배양(培養)중 유산균수(乳酸菌數) 변화(變化)는 Control구(區)가 배양(培養) 16시간(時間)에 $3.1{\times}10^{10}/ml$이 되었는데 반하여 Bios 2000 첨가구(添加區)는 10시간(時間)에 $2.1{\times}10^{10}/ml$에 이르러 가장 빠른 생육(生育) 촉진현상(促進現狀)을 보였다. 한펀, CR starter medium 첨가구(添加區)는 12시간(時間)에 $2.9{\times}10^{10}/ml$, Yeast extract 첨가구(添加區)는 12시간(時間)에 $3.8{\times}10^{10}/ml$를 나타내었다. 4. Streptococcus thermophilus의 배양(培養)중 Acidlty 변화(變化)는 Control구(區)가 44시간(時間)만에 0.92%에 이르렀으며, CR starter medium 첨가구(添加區)는 40시간(時間)에 0.96%, Yeast extract 첨가구(添加區)는 32시간(時間)에 0.90% 이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 0.97%로 가장 높게 나타났다. 5. Str. thermophilus 배양(培養)중 pH 변화(變化)는 Control구(區)가 44시간(時間)에 4.27 이고, CR starter medium 첨가구(添加區)는 40시간(時間)에 4.33, Yeast extract 첨가구(添加區)는 32시간(時間)에 4.25이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 4.18로 가장 높게 나타났다. 6. Str. thermophilus의 배양(培養)중 유산균수(乳酸菌數) 변화(變化)는 Control구(區)가 44시간(時間)에 $9.8{\times}10^{9}/ml$이고, CR starter medium 첨가구(添加區)는 40시간(時間)에 $9.5{\times}10^{8}/ml$, Yeast extract 첨가구(添加區)는 32시간(時間)에 $9.6{\times}10^{8}/ml$이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 $2.0{\times}10^{9}/ml$로 가장 높게 나타났다. 7. Lactobacillus casei 균종(菌種)의 배양(培養) 중의 Acidity 변화(變化)는 Control구(區)가 40시간(時間)에 0.92%에 이르렀으며, CR starter medium 첨가구(添加區)는 40시간(時間)에 0.95%, Yeast extract 첨가구(添加區)는 36시간(時間)에 1.01%이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 0.94%로 가장 높게 나타났다. 8. Lac. casei 균종(菌種)의 배양(培養)중 pH 변화(變化)는 Control구(區)가 40시간(時間)에 4.27이고, CR starter medium 첨가구(添加區)는 40시간(時間)에 4.21, Yeast extract 첨가구(添加區)는 36시간(時間)에 4.15이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 4.23으로 가장 높게 나타났다. 9. Lac. casei균종(菌種)의 배양(培養)중 유산균수(乳酸菌數) 변화(變化)는 Control구(區)가 40시간(時間)에 $9.4{\times}10^{7}/ml$이고, CR starter medium 첨가구(添加區)는 40시간(時間)에 $1.1{\times}10^{8}/ml$, Yeast extract 첨가구(添加區)는 36시간(時間)에 $5.0{\times}10^{8}/ml$이었다. 한편, Bios 2000 첨가구(添加區)는 32시간(時間)에 $6.4{\times}10^{8}/ml$로 가장 높게 나타났다.

• 대한골관절종양학회지
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• 제5권1호
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• pp.1-8
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• 1999

A single fraction of 50 Gy extracorporeal irradiation, as a modality of limb-sparing operation, has been used to achieve tumor necrosis in osteosarcoma. Although this modality of radiation therapy preserving the mobility of a joint is commonly practiced, the precise knowledge on the radiobiological response of osteosarcoma cell has remained to be elucidated. We therefore observed whether a single high dose irradiation caused apoptosis in osteosarcoma cells and whether the commitment to apoptosis was associated with cell kinetics. We also investigated radiation dose response along the time course for development of apoptosis following single high dose irradiation. The morphologic change in apoptosis was observed by fluorescence with Hoechst 33258 and the degree and the fraction of cells by flow cytometry. Irradiation of osteosarcoma cells with 10, 30 and 50 Gy resulted in chromatin condensation and apoptotic body formation. The degree of apoptosis in osteosarcoma cells was $29.5{\pm}3.56%$, $39.9{\pm}4.83%$ at 24 and 48 hours after 10 Gy irradiation ; $41.1{\pm}3.93%$, $66.9{\pm}5.21%$ at 24 and 48 hours after 30 Gy irradiation ; and $48.0{\pm}3.69%$, $75.6{\pm}4.65%$ at 24 and 48 hours after 50 Gy irradiation. The fraction of cells in cell-cycle kinetic was $39.2{\pm}4.3%$ in G2/M, $22.1{\pm}4.65%$ in G1 at 24 hours after 10 Gy irradiation ; $51.0{\pm}4.3%$ in G2/M, $20.4{\pm}4.7%$ in G1 at 48 hours after 10 Gy irradiation ; $40.3{\pm}3.9%$ in G2/M, $26.1{\pm}4.7%$ in G1 at 24 hours after 30 Gy irradiation ; $59.2{\pm}3.9%$ in G2/M, $5.9{\pm}5.1%$ in G1 at 48 hours after 30 Gy irradiation ; and $44.3{\pm}4.2%$ in G2/M, $21.1{\pm}3.5%$ in G1 at 24 hours after 50 Gy irradiation. The fraction of cells at 48 hours after 50 Gy irradiation could not be observed because of irradiation induced cell death of most of cells. All values for irradiated cells showed accumulation in G2/M phase and reduction in G1 phase, irrespective of irradiation dose. The results suggest that a single fraction of high dose irradiation with 50 Gy results in accumulation of cells at G2/M phase, leading to apoptosis.

• 한국자원식물학회지
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• 제19권6호
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• pp.680-686
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• 2006

This experiment was conducted on wild vegetables; Gondalbi (Cirsium setidens), Deoduck (Codonopsis lanceolata Trautv.), and Jandae (Adenophora triphylla var. Joponica Hara) seed to study whether priming with deep sea water results in enhancement of seed germination and identify the optimum concentration of the priming solution, and duration of priming. Seeds were primed with 5 various concentrations (5%, 10%, 15%, 20% and 30%) of deep sea water (DSW) in 12 hours, 24 hours, and 48 hours at $24^{\circ}C$. Since Jandae had seed dormancy, it was kept for four weeks in refrigerator at $2^{\circ}C$ after priming treatment. In Deoduck, 5 percentage DSW priming significantly improved the early germination percentage, radicle length, and plumule emergence percentage. Among the priming period of treatments, 24 hours priming showed better performance in this treatment whereas, in Jandae, 12 hours priming with 10 percentages DSW significantly improved the germination percentage and germination rate. This treatment had increased the final germination percentage by 54%, 15% and 40% compared with control, plain water and $KNO_3$ priming respectively. But in Gondalbi, priming did not improve the germination of seed. However, among the priming treatments, 12 hours priming with 3% $KNO_3$ and 20% DSW gave better performance. In both the wild vegetables; Deoduck and Jandae, priming in deep sea water had improved the germination percentage and germination rate as compare to plain water, $KNO_3$, and without priming treatment. Hence the best seed priming treatment on Deoduck and Jandae are 24 hours with 5% DSW and 12 hours with 10% DSW respectively.

• 대한한의학회지
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• 제27권1호
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• pp.23-35
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• 2006

Objectives : This study was conducted to investigate the inhibitory effects of Gaejibokryunghwan on cell proliferation in HeLa cells. Methods : Human uterine cervical carcinoma HeLa cells were cultured in the 1%, 5% and 10% concentration of Gaejibokryunghwan extract solution. All three were cultured for 24 hours, 48 hours and 72 hours each, to examine the inhibitory effects of Gaejibokryunghwan. Afterwards, we drew out the effect of Gaejibokryunghwan extract solution by making 5 analysis. First analysis was to measure the proliferation rate of cells. Second was FACS analysis. Third was to estimate the activity or caspase-3. Fourth, we used XTT assay to analyze the activation or cells. Ana lastly, a molecular biological method was used to determine activation of MAP kinase in the HeLa cells. Results : After 24, 48 and 72 hours cultivation, the proliferation of HeLa cells showed the dose-dependent decrease in all Gaejibokryunghwan extract solution groups compared to the control group. In the FACS analysis, Gaejibokryunghwan extract solution groups showed increased caspase expression compared to the control group, except for the group for 48 and 72 hours in 1 % concentrate. Caspase-3 activities were increased in all, except tile group cultured for 24 hours in 5% concentrate and the groups cultured for 48 hours in 1% and 5% concentrate. In the XTT study, 1% Gaejibokryunghwan extract solution groups showed increase compared to the control group, but other Gaejibokryunghwan extract solution containing groups showed significant decrease compared to the control after 24, 48 and 72 hours of cultivation. The expressions of MAP kinase were decreased in all Gaejibokryunghwan extract solution containing groups compared to the control group after 24, 48 and 72 hours of cultivation. Conclusions : From this study, we could suggest that Gaejibokryunghwan be available to the inhibition of proliferation of human cervical carcinoma cell line, HeLa cells in vitro.

• 한국수산과학회지
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• 제17권2호
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• pp.139-142
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• 1984

인공수정으로 부화시킨 미꾸리자어에 대한 합성세제(LAS)의 급성독성 영향을 실험하고 그 결과를 생물검정법에 의하여 조사하였다. 1. LAS의 영향을 시간에 대하여 각 농도별로 보면 6ppm이 120시간, 18 ppm이 96시간, 30 ppm이 48시간, 그리고 38 ppm이 16시간만에 $100\%$의 폐사율 가져왔다. 2. 반수치사농도 ($LC_{50}$)는 48hr-$LC_{50}$이 12.59ppm, 96 hr-$LC_{50}$은 4.00 ppm, 120 hr-$LC_{50}$은 1.02 ppm이었다. 3. 급성독성에 대한 영향한계농도는 $0.37{\sim}0.43ppm$이고 적용계수는 $0.093{\sim}0.108$로 나타났다. 4. 합성세제의 각 농도에 대한 반수치사를 가져오는 시간($LT_{50}$)은 0.2 ppm이 165.1시간, 2ppm은 106.2시간으로 나타난 반면 8 ppm은 60.3시간으로 낮아져 38ppm의 경우는 23.5시간이었다.

• 한국자원식물학회지
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• 제11권2호
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• pp.124-130
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• 1998

It failed occasionally to take a reasonable emergence rate since tobacco (Nicotiana tabacum L.) seeds were planted on late Jan. showing lowest temperature. This experiment was done to measure the effect of GA3 (concentration ; period) , light quality (red ; white ; dark) during or after its treatment, daily irradiation hours( 0 ; 8 ; 12 ;16) and germination termperature (20 or 10 $^{\circ}C$ ocnstant ; 20/1$0^{\circ}C$ alternating) on the germination rate. Red and white light given during grmination showed no differences between the other daily irradiation hours except that 8 hours red light delayed germination although their 12 hours irradiation had the gratest rate. The rate was increased with increased concentration to GA3 0.01 mM or increased imbibition period to 3 days although the rate of cv. NC 82 was less than that of cv. Burley 21 in the case of dark imbibition of GA3 but daily 12 hours irradiation during germination. Light quality forced during GA3 imbibition eliminated such effect of GA3 shown in the darkness so that only light quality pretreatment and termperature during germinition were affected on the rate. The germination rate of thecultivars was decreased in the order of red, white light, darkness meaning that it was highly influenced by the light quality during GA3 treatment. Regardless of GA3 or light quality treatment,on the other hand, the rate was greater in 20 $^{\circ}C$ constat than 1$0^{\circ}C$ constant and 20/1$0^{\circ}C$ alternating germination temperature having similar germinative patterns.

• 한국농림기상학회지
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• 제5권3호
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• pp.208-212
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• 2003

가로등과 보안등의 증가로 인한 야간조명의 확대와 야간 이동차량의 증가로 전조등 등 농경지 주변에 간헐적으로 조명이 이루어지고 있어 2000년부터 2001년까지 2년 동안 암기간과 야간조파가 벼와 콩의 출수 및 개화에 미치는 영향을 구명하고자 수행한 시험결과를 요약하면 다음과 같다. 12시간 암기 중 3시간마다 10분간 백열등(50∼60 lux)으로 조명한 야간조파 처리에 의하여 벼 생육은 두 품종 모두 암기처리 12시간에 비해 간장은 증가되었으며, 수당립수는 감소되었다. 벼의 출수는 야간조파시 암기처리 12시간에 비하여 일품벼 9일, 화성벼는 26일 지연되었으며, 12시간의 암기처리에 비하여 9시간 암기처리시 일품벼 47일, 화성벼는 41일 지연되었다. 야간조파에 의한 황금콩의 생육은 야간조파시 암기처리 12시간에 비해 경장파 절수가 증가되었으며, 협수는 감소되었고, 12시간의 암기처리에 비하여 9시간 암기처리시 경장 및 절수는 증가되었지만 협수는 감소되었다. 콩의 개화까지 소요일수는 야간조파시 암기처리 12시간에 비하여 4일 지연되었으며, 12시간의 암기처리에 비해 9시간 암기처리시 19일 지연되었다.

• 간호행정학회지
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• 제5권3호
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• pp.513-524
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• 1999

The shortage of nursing personnel was become one of the most serious problems in operating pediatric oncology nursing unit which was the first pediatric oncology nursing unit in Korea. The purpose of this study was to estimate the optimal number of nursing personnel by calculating nursing care hours. The subjects were 13 staff nurses and inpatients of pediatric oncology nursing unit at Seoul National University Hospital during the period of May 20, 1996, to June 2, 1996. The number of nurses' duty was 132, the number of patients treated was 1288 for these 2 weeks. The tools used for this study were pediatric patient classification indexes and direct & indirect care indexes. Each nurse measured the time that they spent for their activities by self record under the supervision of their nurse manager. The method used to calculate the number of nursing personnel was multiplication of the average number of nursing care hours per patient per day with the number of patients. Percentage, average, t-test, F-test were used for data analysis. The results of this study were as follows : 1) The distribution of patient class : Class I & II none, Class III 86.8%. Class IV 12.9% 2) Direct nursing care hours for a patient per shift according to patient classification: Class III : 27.64 minutes, Class IV : 54.64 minutes The average direct nursing service hours for a patient per shift(3 shift) was 31.54 minutes(94.62 m/day). The average indirect nursing service hours for each patient per duty(3 shift) is 21.3 minutes (63. 91 m/day). 3) The average nursing hours for a patient per duty was 52.80 minutes(2.64h/day). 4) The group of administering medications in direct care activities showed the highest percentage (38.9%). Checking vital signs among observation took the most time am.ong each direct care activity (6.88 minutes for a patient per duty). 5) Charting took the most time of each indirect care activity(52.53 minutes/ duty/nurse). 6) The average personal time per duty is 29.40 minutes, which 'was below 30 minutes of this hospital regulations. 7) The average nursing hours that a nurse provided for a duty was 8.60 hours, which meant that a nurse worked 1.10 hours overtime. 8) Standardizing to a 33 bed to a unit, 17 nurses were needed at the present nursing level.

• Annals of Occupational and Environmental Medicine
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• 제35권
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• pp.21.1-21.11
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• 2023

Background: Recently, irregular working hours have become controversial issues in Korea. The health impact of irregular working hours on the work-related musculoskeletal pain (MSP) is scarcely researched before. We sought to investigate the association between irregular working hours and work-related MSP among South Korean workers. Methods: This study used data from the sixth Korean Working Conditions Survey in 2020. The prevalence of work-related MSP was analyzed using the χ² test. A multiple logistic regression analysis was conducted to assess the association between irregular working hours and work-related MSP. We conducted stratified analysis by gender, weekly working hours, and workers' control over their working hours. We calculated the adjusted odds ratios (ORs) of work-related MSP for irregular working hours combined with weekly working hours. Results: The OR for work-related MSP was significantly higher in the population with irregular working hours than in the population with regular working hours (OR: 1.43, 95% confidence interval [CI]: 1.29-1.58). Irregular and long (> 52 hours/week) working hours have the highest risk of work-related MSP in both genders (in men, OR: 3.48 [95% CI: 2.53-4.78]; in women, OR: 2.41 [95% CI: 1.46-4.00]). Conclusions: Irregular working hours were associated with work-related MSP in Korea. The association was magnified with long working hours. Reform of the Korean Labor Standards Act leading to increase irregular working hours may induce adverse health outcome.

• Journal of Chest Surgery
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• 제28권12호
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• pp.1096-1106
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• 1995

We experienced 7 cases of left single lung transplantation in 14 mongrel dogs and analyzed graft lung function by hemodynamics, blood gas analysis, chest X-ray, biopsy and perfusion lung scan. We performed right pulmonary artery cuff[PA cuff for analysis of graft lung function in 3 cases. The donor lungs were flushed with modified Euro-Collins solution[n=3 or low potassium dextran glucose solution[n=4 and preserved for 4 to 5 hours[n=4 or 24 hours[n=3 at 10o C and implanted to the dogs with similar weight . Assessment of left graft lung was done by occluding the right pulmonary artery for 10 minutes using PA cuff. Assessment for graft lung function was done immediately after an operation and after 3 days, 7days and 3 weeks postoperatively. Four dogs survived for 3days, 7days[2 cases and 3 weeks respectively. Other three dogs expired within 3 hours of reperfusion. Immediate perfusion scans of left lung in four survived dogs after reperfusion were 42.1%, 36% , 11% and 5.9% respectively, and another dog with 4.8% perfusion to left lung was dead due to left atrial thrombi after 3 hours reperfusion. In one case among three acute rejections follow-up perfusion scan was done on 3rd and 11th postoperative day and the result decreased from 36% perfusion immediate postoperatively to 21% and 15% respectively. Three expired dogs postoperatively couldn`t tolerate occlusion of right pulmonary artery with above 40 mmHg of mean pulmonary artery pressure. On the other hand, three survival dogs postoperatively tolerated occlusion of right pulmonay artery with less than 30 mmHg of mean pulmonary artery pressure. and one dog couldn`t tolerate same procedure immediate postopertively but in 2 hours reperfusion later tolerated with 29 mmHg of mean pulmonary artery pressure.In conclusion we couldn`t compare the effect of two flushing solutions but low potassium dextran glucose solution showed relatively safe preservation effect in cases with preservation of more than 20 hours. Also canine left single lung transplantation model with PA cuff indicated useful method for the assessment of graft lung function with effect of lung preservation.