• Neonatal Medicine
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• 제18권2호
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• pp.272-279
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• 2011

목적: 최근 신생아 집중 치료실(neonatal intensive care unit, NICU)에 입원한 신생아들의 병원내 감염 중 그람 음성 간균(Gram negative bacilli, GNB)에 의한 패혈증이 증가하고 있다. NICU에서 정기적인 대변의 감시 배양을 통해 GNB에 의한 장관 집락화가 같은 균에 의한 패혈증으로 이행되는 지를 확인하고, 집락화된 GNB 병원균의 종류를 확인하며 집락화에 관여하는 위험인자를 조사하고자 하였다. 방법: 2007년 10월부터 2008년 5월까지 고신대학교 복음병원 신생아 집중치료실에 입원한 86명의 환아를 대상으로 하였다. 모든 환아에게 총 3회의 대변 채집을 계획하였는데, 출생 후 첫 대변과 2주 간격으로 2회 채집을 계획하였다. 장관의 GNB 집락화와 관련된 위험 인자들은 대상 환아들의 의무기록을 열람하거나 연관된 논문의 고찰을 통해 설정하였다. 결과: 86명의 환아 중 22명(25.6%)이 GNB에 의한 장관 집락화가 있었으나 이 환아들을 퇴원까지 추적하였을 때 GNB로 인한 패혈증은 없었다. Pseudomonas aeruginosa, Enterobcter cloacae, Citrobacter freundii가 가장 많이 분리되었다. 분리된 GNB 중 약 89% (32/36)는 amikacin에 감수성이 있었다. GNB 에 의한 장관 집락화의 가능성은 집락화 당시 수유량이 적을 때 증가한 반면, 첫 수유 시기가 지연될 때 그 가능성은 감소하였다. 결론: 저자들은 NICU에 입원한 신생아에서 장관 감시배양을 통해 장관에 집락화된 GNB를 확인하였으나 연구에 포함된 환아에서 GNB에 의한 패혈증이 발생하지 않았으므로 집락화가 패혈증으로 이행되는 지를 확인할 수는 없었다. 집락화시 적은 수유량(feeding volume at colonization day)이 집락화의 위험요인이었으므로 장관 영양의 진행이 원활하지 않을 경우 장관의 GNB 집락화 가능성을 고려해야 한다.

• 한국식품저장유통학회지
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• 제30권5호
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• pp.785-796
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• 2023

The aim of this study was to elucidate chemical structures and rheological properties of arabinogalactans (AGs) isolated from three legumes including black gram (BG), great northern bean (GNB), and California small white bean (CSWB). The ratio of galactose to arabinose (G/A) in three legumes increased in the order of BG > GNB > CSWB. The rheological measurements of 1-5% (w/v) AG solutions revealed Newtonian and non-Newtonian flow behaviors. BG exhibited yield stress, indicating plastic behavior. Small-amplitude oscillatory tests indicated viscoelastic properties of BG, GNB, and CSWB ranging from solid-like, paste-like, and liquid-like behaviors, respectively. Small-strain oscillatory tests were conducted to assess the structure recovery of the AGs after pre-shearing. G" values of BG and GNB increased, but those of CSWB remained constant after shearing. These results suggest that the chemical structures of the AGs, particularly their G/A ratios, influence their rheological properties.

• 한국환경보건학회지
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• 제30권5호
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• pp.440-448
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• 2004

Airborne bacteria, gram negative bacteria (GNB) and fungi were measured in 70 class of 17 kindergartens. The objective of this study is to identify the factors influencing airborne concentrations of bacteria, GNB and fungi using multiple regression analysis. The average concentrations of bacteria and fungi exceeded $1,000\;CFU/m^3$. The average of GNB was $3.7{\times}10^2\;CFU/m^3$. This results indicated that air of kindergartens was contaminated with microbes such as bacteria and fungi. ANOVA test found that the concentrations of bacteria, GNB and fungi were significantly different by the characteristics of weather (rain, after rain, sunny) sampling date (July, August, September and October), the location of sampling site (ground level and basement) and the location of toilet (inside class, nearby class and away class). Multiple regression tests concluded that sampling date, the scale of city where kindergartens are located, the location of sampling site and ventilation efficiency can significantly affect the airborne concentration of bacteria, GNB and fungi. Most of these factors could be related moisture. Environmental factors that can cause the increment of moisture should be controlled in order to reduce airborne concentration of bacteria, GNB and fungi. Legal actions concerning prohibition on the presence of toilet inside class and ventilation criteria should be taken.

• The Korean Journal of Physiology and Pharmacology
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• 제22권3호
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• pp.343-348
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• 2018

Recent human genetic studies have shown that $G{\beta}5$ is related to various clinical symptoms, such as sinus bradycardia, cognitive disability, and attention deficit hyperactivity disorder. Although the calcium signaling cascade is closely associated with a heterotrimeric G-protein, the function of $G{\beta}5$ in calcium signaling and its relevance to clinical symptoms remain unknown. In this study, we investigated the in vitro changes of store-operated calcium entry (SOCE) with exogenous expression of $G{\beta}5$. The cells expressing $G{\beta}5$ had enhanced SOCE after depletion of calcium ion inside the endoplasmic reticulum. $G{\beta}5$ also augmented Stim1- and Orai1-dependent SOCE. An ORAI1 loss-of-function mutant did not show inhibition of $G{\beta}5$-induced SOCE, and a STIM1-ERM truncation mutant showed no enhancement of SOCE. These results suggested a novel role of GNB5 and Stim1, and provided insight into the regulatory mechanism of SOCE.

• 한국환경보건학회지
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• 제36권3호
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• pp.191-198
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• 2010

The aim of this study was to determine the concentrations of air-borne microorganisms (bacteria, fungi, gram negative bacteria (GNB), endotoxins, and respirable suspended particles (RSPs), and their correlation with environmental parameters (temperature, humidity, and carbon dioxide levels) in duck houses. The mean concentrations of bacteria, fungi, and GNB were very high (> $10^6\;CFU/m^3$), and endotoxin levels exceeded $10^3\;EU/m^3$. Among the various work stages, in the task of receiving ducks, bacteria were $6.2{\times}10^6;CFU/m^3$, and GNB were $5.4{\times}10^6\;CFU/m^3$, while RSPs levels were $397.6\;{\mu}g/m^3$ and endotoxin levels were $47.2{\times}10^3\;EU/m^3$ in the task of dividing the ducks, and fungi were $4.9{\times}10^6\;CFU/m^3$ in the task of shipping the ducks. The concentrations of RSPs and endotoxins were significantly higher in tasks involving greater movement of ducks in the house, relative to tasks involving little movement of ducks (p<0.05). Further, with progression in growth of the ducks, the concentrations of bacteria, GNB, endotoxins, and RSPs were significantly increased. There was significant correlation between levels of GNB with bacteria (r=0.75) and fungi (r=0.86), endotoxins with RSPs (r=0.75), bacteria with fungi (r=0.39), and carbon dioxide with RSPs (r=0.38), bacteria (r=0.33), and endotoxins (r=0.31). These results suggest considerable respiratory hazard for farmers in these environments.

• 동의생리병리학회지
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• 제18권5호
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• pp.1426-1436
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• 2004

There have been several reports on the relationship between G protein β3 subunit gene (GNB3), angiotensin converting enzyme gene (ACE), β3-adrenergic receptor gene (ADRB3), and β2-adrenergic receptor gene (ADRB2) genotype and obesity or obesity related disease. The objective of this study was to examine the relationship between the combinations of these four genes' polymorphism and probability of obesity related disease in Korean female subjects. The experimental group was consisted of 85 obese Korean female subjects (body mass index, BMI≥27㎏/㎡). To determine the polymorphism, genomic DNA was isolated, and PCR was performed. Serological examinations (fasting plasma glucose, FPG; aspartate aminotranferase, AST; alanine aminotransferase, ALT; total cholesterol, TC; triglyceride, TG; high density lipoprotein-cholesterol, HDL; low density lipoprotein-choles terol, LDL) were carried by an autoanalyzer and serological methods. BMI, waist circumference (WC), hip circumference and waist hip ratio (WHR) were measured. Consequencely in the analysis with grouping of general genotyping and variant allele carrier/non-carrier, the result was not significantly different within all gene combinations and polymorphic pairings except higher waist circumference in Arg16Arg group of ADRB2 codon16 (P=0.024). And there was no significantly contrast result about age, height, weight, AST and ALT that are index feature of liver and gall bladder disease in polymorphic pairings of gene combinations. However, the statistical analysis of waist-hip ratio and waist circumference that could be recognized as the physical type of obesity showed T-Arg16 pairing carrier in GNB3-ADRB2 codon16 combination had increased WHR and WC significantly (P=0.046 and P=0.015 respectively). Futhermore, the levels of total cholesterol (TC) and low density lipoprotein choresteral (LDL) were significantly lower in C-I pairing of GNB3-ACE combination (P=0.032 and P=0.005). These results suggest that the T-Arg16 pairing carrier in GNB3-ADRB2 codon16 gene might have increased waist circumference and C-I pairing carrier in GNB3-ACE combination have lower possibility of contraction of cardiovascular disease related cholesterol and LDL despite of obese state.

• Nuclear Engineering and Technology
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• 제55권5호
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• pp.1708-1717
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• 2023

The grade analysis of lead-zinc ore is the basis for the optimal development and utilization of deposits. In this study, a method combining Prompt Gamma Neutron Activation Analysis (PGNAA) technology and machine learning is proposed for lead-zinc mine borehole logging, which can identify lead-zinc ores of different grades and gangue in the formation, providing real-time grade information qualitatively and semi-quantitatively. Firstly, Monte Carlo simulation is used to obtain a gamma-ray spectrum data set for training and testing machine learning classification algorithms. These spectra are broadened, normalized and separated into inelastic scattering and capture spectra, and then used to fit different classifier models. When the comprehensive grade boundary of high- and low-grade ores is set to 5%, the evaluation metrics calculated by the 5-fold cross-validation show that the SVM (Support Vector Machine), KNN (K-Nearest Neighbor), GNB (Gaussian Naive Bayes) and RF (Random Forest) models can effectively distinguish lead-zinc ore from gangue. At the same time, the GNB model has achieved the optimal accuracy of 91.45% when identifying high- and low-grade ores, and the F₁ score for both types of ores is greater than 0.9.

• Pediatric Infection and Vaccine
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• 제24권2호
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• pp.71-78
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• 2017

목적: 2011년부터 2015년까지 최근 5년간 서울대학교 어린이병원 소아 혈액종양 환자에게 발생한 균혈증의 원인균 분포와 이들의 항생제감수성을 분석하여 경험적 항생제 선택에 실제적인 도움을 얻고자 하였으며 원인균의 분포와 항생제감수성에서 이전 연구와 경향성을 비교하고자 하였다. 방법: 2011년부터 2015년 12월까지 서울대학교 어린이병원에서 입원 치료를 받은 소아 혈액종양 환자들에게 발생한 균혈증에 대하여 의무기록을 후향적으로 분석하였다. 결과: 총 167명의 소아 종양 환자에게 221예의 균혈증이 발생하였고, 229 균주가 분리되었다. 이 중 그람음성균, 그람양성균, 진균이 각각 69.0% (2002-2005년 64.0%, 2006-2010년 63.4%), 28.8%(2002-2005년 31.3%, 2006-2010년 34.6%), 2.2% (2002-2005년 4.7%, 2006-2010년 2.0%)의 분포를 보였다. 그람음성균 중에는 Klebsiella species (53.2%, 84/158), Escherichia coli (19.6%, 31/158), 그람양성균 중에는 Staphylococcus aureus (48.5%, 32/66), viridans streptococci (21.2%, 14/66)가 높은 비율로 분리되었다. 그람양성균의 페니실린, 옥사실린, 반코마이신 감수성률은 각각 13.8%, 54.8%, 96.9% (2002-2005년 16.7%, 51.5%, 95.5%; 2006-2010년 14.3%, 34.1%, 90.5%)이었고, 그람음성균의 세포탁심(cefotaxime), 피페라실린/타조박탐(piperacillin/tazobactam), 이미페넴(imipenem), 겐타마이신(gentamicin), 아미카신(amikacin) 감수성률은 각각 73.2%, 77.2%, 92.6%, 71.0%, 95.2% (2002-2005년 75.9%, 82.8%, 93.4%, 78.4%, 85.8%; 2006-2010년 62.8%, 82.9%, 93.8%, 67.8%, 86.3%)이었다. 본 연구의 원인균 분포 및 항생제감수성률은 과거 연구와 비교하여 차이가 없었다. 전체 환자에서 치사율은 13.1%이었다. 결론: 그람음성균은 소아 혈액종양 환자의 균혈증의 가장 흔한 원인균이다. 균혈증의 원인균과 항생제감수성은 이전 연구들과 다르지 않았다. 연구 결과에 따라 본 연구 기관에서는 예년과 같이 발열을 동반하는 소아 혈액종양 환자에서의 경험적 항생제를 피페라실린/타조박탐으로 투여할 수 있을 것이다.

• 한국환경보건학회지
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• 제35권5호
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• pp.355-361
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• 2009

This study evaluated the bacterial concentrations and affecting factors at the laboratories of a university in Seoul, Korea. Thirty-three samples of total airborne bacteria (TAB) and eighteen samples of gram negative bacteria (GNB) were collected from both microbiology laboratories (7) and chemistry laboratories (6). GM (GSD) of TAB and GNB concentrations were 194 (2.52) $cfu/m^3$, 24 (4.1) $cfu/m^3$, respectively. TAB concentrations in the chemical laboratories (GM (GSD): 193 (2.0) $cfu/m^3$) were not significantly different from those in microbial laboratories (GM (GSD): 202 (2.7) $cfu/m^3$, (p>0.05)). GM (GSD) of TAB concentrationsat the top of sink, the center of laboratory, and the front of ventilation ventilation device within laboratories, 182 (3.2) $cfu/m^3$, 217 (2.2) $cfu/m^3$, 176 (2.4) $cfu/m^3$, respectively, were not significantly different (p=0.48). Related factors were measured such as temperature, relative humidity, floor of laboratory, number of persons and laboratory area. TAB concentrations were significantly related to temperature (r=0.36, p<0.05), and the floor of laboratory and temperature were also significantly related (r=0.49, p<0.001). However, other factors such as relative humidity, number of persons and laboratory area did not show any significant relationship with TAB concentrations (p>0.05). TAB concentrations were affected significantly by cleaning frequency (p<0.001) and floor of laboratory (p<0.05). There was also a significant difference (p<0.01) between TAB indoor concentrations and TAB outdoor concentrations. However, other factors such as general ventilation did not affect TAB concentrations (p>0.05) in this study.

• Asian-Australasian Journal of Animal Sciences
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• 제33권9호
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• pp.1520-1532
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• 2020

Objective: Due to rapid economic return, mixed crop-swine farming systems in Korea have become more intensive. Intensive farming practices often cause nutrient surpluses and lead to environmental pollution. Nutrient budgets can be used to evaluate the environmental impact and as a regulatory policy instrument for nutrient management. This study was conducted to select a nutrient budgeting approach applicable to the mixed crop-swine farms in Korea and suggest an effective manure treatment method to reduce on-farm nutrient production. Methods: In this study, we compared current and ideal gross nutrient balance (GNB) approaches of Organisation for Economic Co-operation and Development and soil system budget (SSB) approach with reference to on-farm manure treatment processes. Data obtained from farm census and published literature were used to develop the farm nutrient budgets. Results: The average nitrogen (N) and phosphorus (P) surpluses were approximately 11 times and over 7 times respectively higher in the GNB approaches than the SSB. After solid-liquid separation of manure, during liquid composting a change in aeration method from intermittent to continuous reduced the N and P loading about 50% and 47%, respectively. Although changing in solid composting method from turning only to turning+aeration improved the N removal efficiency by 30.5%, not much improvement in P removal efficiency was observed. Conclusion: Although the GNB approaches depict the impact of nutrients produced in the mixed crop-swine farms on the overall agricultural environment, the SSB approach shows the partitioning among different nutrient loss pathways and storage of nutrients within the soil system; thus, can help design sustainable nutrient management plans for the mixed cropswine farms. The study also suggests that continuous aeration for liquid composting and turning+aeration for solid composting can reduce nutrient loading to the soil.