Environmental Microbiology / Microbial Diversity : Calcium Carbonate Precipitation by Bacillus and Sporosarcina Strains Isolated from Concrete and Analysis of the Bacterial Community of Concrete(s)

( Hyun Jung Kim ),( Hyo Jung Eom ),( Chulwoo Park ),( Jaejoon Jung ),( Bora Shin ),( Wook Kim ),( Namhyun Chung ),( In Geol Choi ),( Woojun Park ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.3

Microbially induced calcium carbonate precipitation (CCP) is a long-standing but re-emerging environmental engineering process for production of self-healing concrete, bioremediation, and long-term storage of CO2. CCP-capable bacteria, two Bacillus strains (JH3 and JH7) and one Sporosarcina strain (HYO08), were isolated from two samples of concrete and characterized phylogenetically. Calcium carbonate crystals precipitated by the three strains were morphologically distinct according to field emission scanning electron microscopy. Energy dispersive X-ray spectrometry mapping confirmed biomineralization via extracellular calcium carbonate production. The three strains differed in their physiological characteristics: growth at alkali pH and high NaCl concentrations, and urease activity. Sporosarcina sp. HYO08 and Bacillus sp. JH7 were more alkali- and halotolerant, respectively. Analysis of the community from the same concrete samples using barcoded pyrosequencing revealed that the relative abundance of Bacillus and Sporosarcina species was low, which indicated low culturability of other dominant bacteria. This study suggests that calcium carbonate crystals with different properties can be produced by various CCP-capable strains, and other novel isolates await discovery.

파종시기가 다른 일미찰의 등숙 중 호화 특성 비교

김미정, 박효진, 이유영, 김선림, 김정태, 우관식, 권영업, 정일민 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2

This study was conducted to investigate the pasting properties of waxy corn ‘Ilmichal’ during ripening with different sowing date. Starch content of Ilmichal was increased as matured (p<0.05). Analysis of pasting properties with waxy corn starch using a rapid visco analyser (RVA) showed linear changes in peak viscosity, trough viscosity, final viscosity, breakdown and consistency according to ripening. There were significantly positive correlation between starch content of Ilmichal and peak viscosity (0.39*), trough viscosity (0.58***), final viscosity (0.58***), and consistency (0.57**). Differential scanning calorimerty (DSC). The enthalpy of gelatinization was increased as ripening. But onset and peak temperature were decreased. There were significantly positive correlation between starch content of Ilmichal and onset temperature (0.44*), peak temperature (0.38*), and completion temperature (0.59***), on the other hand, crude protein content presented significantly negative correlation between completion temperature (-0.41*).

Ti 클래드 강판 제조를 위한 저항 seam 접합 공정의 열전달 수치 해석

정순효,도정만,변지영 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.2

The electrical and thermal fields during a resistance seam welding process for the production of titanium-clad steel plates were numerically analyzed using a finite volume method. Effect of welding parameters such as welding speed, electric current, heating/cooling period, electrode/plate contact area, water cooling intensity, and thermal conductivity of electrode, on temperatures at the bonding layer and titanium surface were studied. With the increase of the water cooling intensity, welding speed, electrode/plate contact area, and thermal conductivity of electrode, temperatures at the bonding layer and titanium surface decreased, but they increased with increasing the heating/cooling period and electric current. Strong cooling, low welding speed, and the use of high thermal-conductivity electrodes were advantageous in preventing oxidation of titanium surface.

대뇌 피질 신경 세포 일차 배양에서 6-hydroxydopamine에 의한 신경세포사멸의 특성

정재훈,강효정,손성향,정영기,곽병주,노재성 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.3

연구목적 : 본 연구는 생쥐 태자 대뇌 피질 세포 일차 배양에서 파킨슨씨병의 동물 모델을 만드는데 사용되는 신경독성 물질인 6-hydroxydopamine(6-OHDA)에 의한 신경세포 사멸의 특성을 관찰한 것이다. 방 법 : 생쥐태자의 신경세포를 배양하여 6-OHDA를 처리하고 이와 더불어 여러가지 신경세포 사멸에 영향을 주는 물질을 투여하여 신경세포의 사멸을 정량적으로 분석하고 형태학적 분석을 전자현미경을 통하여 관찰하였다. 결 과 : 배양한 신경세포에 6-OHDA를 처리하면 투여 양에 비례하여 신경세포의 사멸이 증가하여 50μM 66-OHDA를 24시간 투여하여 일으킨 신경세포 사멸의 형태학적 특징은 세포질의 수축 및 염색질의 응축(nuclear chromatin condensation) 및 핵질의 fragmentation을 동반하는 고사(apoptosis) 형태이다. 이 때의 신경세포의 사멸은 항고사 물질인, 1㎍/ml cycloheximide와 caspase 억제제인 10μMzVAD-fmk에 의해 약화되었으나 글루타메이트 길항제(10μM MK-801 혹은 50μM CNQX)나 항산화제 (100μM trolox 혹은 100μM N-acetyl-cysteine)는 6-OHDA에 의한 신경세포의 사멸을 막지 못했다. 결 론 : 이상의 형태학적 및 약물학적 특징은 6-OHDA가 고사성 신경세포 사멸을 유도한다는 것을 의미하고, 항산화제들이 효과가 없다는 것과 caspase 억제제가 보호효과가 있다는 것은 6-OHDA에 의한 고사성 신경세포 사멸에는 산화적 스트레스보다는 caspase cascade와 관여된 기전이 기여한다는 것을 시사한다. 또한 6-OHDA에 의한 신경세포의 사며른 도파민성 신경세포에 선택적이지 않으며, 일차 대뇌피질 신경세포 배양 시스템이 6-OHDA에 의한 신경세포사멸인구에 사용될 수 있음을 보여준다 Objectives : We examined the patterns of cell death induced by the 6-hydroxydopamine, a selective dopaminergic toxin that used to produce Parkinson's disease model. Method : Neocortices from 14 - or 15-day-old fetal mice for neuron-glia co-cultures were used for this experiments. Results : Cortical cell cultures exposed to 10-100μM 6-hydroxydopamine for 24 hr underwent neuronal death without injuring glia. The degenerating neurons showed hallmark of apoptosis featuring cell body shrinkage, nuclear chromatin condensation and aggregation, nuclear membrane disintegration with intact plasma membrane, and prominent internucle- osomal DNA fragmentation. Neither the glutamate antagonists (10μM MK-801 and 50μM CNQX) nor antioxidants(trolox, 100μM, N-acetyl-cysteine, 100μM prevented the 6-OHDA induced neuronal injury. The death was attenuated by addition of two different anti-apoptotic agents, 1㎍/ml cycloheximide and caspase inhibitor(100μM zVAD-fmk). Conclusion : These features suggest that 6-OHDA induced apoptotic type of neuronal death in cortical neuronal culture. Considering the protective effect of caspase inhibitors, a mechanism involing caspase cascade rather than oxidative stress is responsible for the 6-OHDA-induced neuronal apoptosis. In addition, our results showed that 6-OHDA-induced apoptosis is not confined to dopaminergic neurons and the primary cortical culture system so this system is suitable for the study of 6-OHDA-induced neuronal apoptosis.

심전도에서 조기재분극을 보인 특발성 심실세동

이정은,함효주,이관용,노지웅,유진석,정우백 이화여자대학교 의과학연구소 2014 EMJ (Ewha medical journal) Vol.37 No.2

Early repolarization is a common electrocardiographic (ECG) feature found in young adults, men and athletes, and has been considered to be a benign feature for the last several decades. But recent studies suggest that early repolarization may be related to idiopathic ventricular fibrillation and sudden cardiac death. We report a young man, 35 years old, who had life threatening ventricular fibrillation and sudden cardiac arrest. He was evaluated for cardiac causes of ventricular fibrillation. There was no explanation other than that his ECG showed an early repolarization pattern so we treated him with implantable cardioverter defibrillator. Thus, we suggest that early repolarization may be related with life threatening ventricular arrhythmia.

신경회로망 자기동조 PID 제어기를 이용한 전력계통 안정화에 관한 연구

정형환,김상효,이정필,정문규 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2

This paper applied the neural network self-tuning PID controller to its linearized one-machine infinite bus for improvement in the power system stabilization. It ia tried to regulate the optimum parameters of the PID Controller using the learning algorithm of error back propagation. The simulation results show that the proposed control technique is decidedly superior to the conventional ones in dynamic responses about various disturbances arising in the power system.

어린이집 형태로 운영하는 예체능 학원의 운영실태와 학부모의 인식에 관한 연구 : 대구·경북지방을 중심으로

정정희,김수영,최효정 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.35

Increasing numbers of children are being served in more formal, academic instructional institution. The purpose of this study was to investigate the phenomena of early private education for preschool children at private institution. The subjects of this study were 94 directors, 88 teachers, and 197 parents who were selected by random sample from private institution in Taegu and Kyungpook area. Major findings were as follows: (1) 88% of institutes had no playground and their classrooms were placed on the second or third floors of the buildings. (2) Most of the institutes had educational objectives, but the goal content was not balanced, especially social-emotional development was over-stressed in comparison with other educational objectives. (3) Many parents were shown to have high and unrealistic expectations regarding achievement of preschool children. The parents' main reason for having their children early private educations were helping children for their academic achievements.

할로페리돌로 유도한 신경세포 고사에 대한 신경성장인자 및 인슐린 유사 성장인자의 억제효과

강효정,강지윤,곽병주,정영기,노재성 大韓神經精神醫學會 2000 신경정신의학 Vol.39 No.5

연구목적: 본 연구는 생쥐 태자의 대뇌피질 세포 일차 배양을 이용하여 할로페리돌로 유도한 신경세포의 사멸에 대해 신경 성장인자인 brain-dervied neurtrophic factor(BDNF), Neurotrophin 4/5(NT 4/5)와 인슐린 유사 성장인자인 insulin-like growth factor Ⅰ(IGF-Ⅰ)및 IGF-Ⅱ의 조절효과를 실험한 것이다. 방법: 생쥐 태자의 신경세포를 배양한 후 할로페리돌을 처리하여 신경세포의 사멸을 유도하고 이에 대한 성장인자의 효과를 정량적으로 분석하였다. 결과: 30M의 할로페리돌을 배양한 일차 대뇌 신경세포에 24시간 처리하면 광범위한 신경세포의 사멸이 유도된다. 이때 신경세포는 세포의 응축, DNA의 단편화와 응집, 세포막보다 핵막의 이른 붕괴 등 고사 형태의 신경세포 사멸 특성을 보인다. 할로페리돌과 더불어 신경성장인자인 BDNF, NT 4/5 및 인슐린 유사 성장 인자인 IGF-Ⅰ 혹은 IGF-Ⅱ를 동시에 처리할 경우 용량 의존적으로 신경세포의 사멸을 억제한다. 결론: 본 연구의 결과는 할로페리돌에 의한 신경독성이 성장인다들에 의해 억제될 수 있음을 보여주는 것이며, 장기적인 항정신병약물의 사용 후에 발생하는 부작용인 지발성 운동장애의 한가지 원인 가설로 대두되고 있는 항정신병 약물에 의한 신경독성을 신경성장인자에 의해 억제할 수 있을 가능성을 제시하는 것이다. 중심단어:할로페리돌·고사·세포사멸·고사·BDNF·NT-4/5·IGF-Ⅰ·IGF-Ⅱ. Objectives: We examined the effects of neurotrophins and insulin-like growth factors on cell death induced by haloperidol, a typical anti-psychotic agent. Method: Neocortices from 14- or 5-daysold fetal mice for neuron-glia co-cultures were used for this experiment. Result: Twenty-four hours treatment of mouse cortical cell cultures with 30 M haloperidol-induced wide spread neuronal apoptosis characterized by cell body shrinkage, DNA frag-mentation and condensation. Concurrent treatment with growth factors, BDNF, NT4/5, IGF-Ⅰand IGF-Ⅱ, protect the neurons from the haloperidol-induced neuronal apoptosis(HINA) in a dose dependent manner(10-100ng/ml). Conclusion: The present study suggests the possibility that haloperidol toxicity can be hampered with growth factors. Further study about the mechanism underlying the protective capacity of the growth factors on HINA may lead to the development of the new protective strategy for tardive dyskinesia. KEY WORDS:Haloperidol·Apoptosis·Neuronal death·BDNF·NT4/5·IGF-Ⅰ·IGF-Ⅱ.

비글개에서 신원방우황청심원의 급성 및 아급성독성시험

성하정,권오경,방명주,곽형일,이진영,신대희,박대규,정규혁,윤효인,조명행 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

Single and 4 weeks oral administration of New wonbangwoohwangchungsimwon (NSCH) which was used l-muscone as substitutive material of musk, to beagle dogs of both sexes were performed to investigate both acute and subacute toxicity. Beagle dogs (3 males and 3 females) in acute experiments were administered orally with sinlge dose of 2,000 ㎎/㎏ and groups of 9 male and 9 female beagle dogs in subacute experiments were given daily different dosage of NSCH, 160 ㎎/㎏/day (low dosage group), 400 ㎎/㎏/day (middle dosage group), 1,000 ㎎/㎏/day (high dosage group) once a day for 4 weeks by oral route according to the Established Regulation of Korea Food and Drug Administration (1996. 4. 16). LD_50 value for beagle dogs was more than 2,000 ㎎/㎏ per oral for both male and females. In animals administered with NSCH, there were neither dead animals nor significant changes of body weights. In addition, no differences were found between control and treated groups in clinical sign, urinalysis, eye examination, hematology, serum chemistry, organ weight and other fingings. No histological lesions were observed in both control and treatment groups. Above data strongly suggset that NSCH in beagle dogs is considered to be safe.

우리나라 간염 B표면항원 음성 만성 간질환 환자에서 B형 및 C형 간염 바이러스의 원인적 역할 : 중합효소 연쇄반응을 이용한 혈청 B형 간염 바이러스 DNA 검출 및 혈청 anti-HCV 검출에 의한 규명 Determination of Serum HBV DNA Using Polymerase Chain Reaction and of Serum Anti-HCV Using ELISA

이효석,윤정환,김웅,김정룡 대한내과학회 1992 대한내과학회지 Vol.42 No.1

중합효소 연쇄반응법이 소개된 후, 간염 B표면항원 음성인 만성 간질환 환자의 혈청내 존재하는 극미량의 B형 간염 바이러스 DNA(HBV DNA)를 검출할 수 있게 되었다. 또한, C형 간염 바이러스(HCV)에 대한 혈청학적 검사 방법인 C100-3항원에 대한 항체 측정법(anti-HCV)이 개발된 후 C형 간염 바이러스 감염의 증거로 이용되게 되었다. 이에 연구자는 간염 B표면항원 음성인 만성 간질환의 병인으로서 B형 간염바이러스 및 C형 간염 바이러스의 상대적 역할을 규명하고, 간염 B표면항원 음성 만성 간질환 환자 80명을 대상으로 중합효소 연쇄반응법을 이용하여 혈청내 HBV DNA를 검출하고, 동시에 ELISA법으로 anti-HCV를 검출하였다. 전체 80명의 환자는 B형 간염 바이러스의 혈청학적 양상에 따라 다음 세군으로 구분되었다. 1) B형 간염 핵항체만 양성인 군(제1군, 24명), 2) B형 간염 핵항체 및 표면 항체가 모두 양성인 군(제 2군, 24명) 및 3) 모든 B형 간염 바이러스 혈청학적 표지자가 음성인 군(제 3군, 32명). 전체 80명 중 혈청 HBV DNA는 15%, anti-HCV는 46%에서 검출되었다. 제1군, 2군 및 3군에서의 혈철 HBV DNA 검출률은 각각 46%, 0% 및 3%였으며, anti-HCV 검출률은 각각 54%, 54% 및 34%였다. 또한 중복감염은 제 1군에서만 22%였다. 이상의 결과로 간염 B표면항원 음성인 만성 간질환 환자의 병인으로서 HCV가 중요한 역할을 하며, 특히 B형 간염 핵항체만 양성인 군에서는 HCV뿐만 아니라 HBV도 중요한 병인으로 작용하고 있음을 알았다. 그러나 상기 결과는 아직 밝혀지지 않은 또 다른 간염 바이러스의 존재 가능성을 시사해주는 소견이기도 하다. An extremely low level of serum HBV DNA can now be detected in patients with HBsAg-negative chronic liver disease with the advent of polymerase chain reaction analysis for HBV DNA. The serologic test for antibody to hepatitis C virus, namely the detection of anti-C100-3 antibody, has provided a good marker of chronic, persistent viremia. To investigate the relative etiologic role of HBV and HCV in HBsAg-negative patients with chronic liver disease, serum HBV DNA and anti-HCV were detected by polymerase chain reaction-Southern blot analysis and ELISA, respectively, in 80 HBsAg-negative patients with chronic liver disease. A total of 80 patients were divided into 3 groups according to the serologic profiles for hepatitis B virus: 1) isolated anti-HBc positive(group Ⅰ, n=24), 2) positive for both anti-HBc and anti-HBs(group Ⅱ, n=24) and 3) negative for all hepatitis B virus serologic markers (group Ⅲ, n=32). Serum HBV DNA and anti-HCV were detected in 15% and 46%, respectively, of the total number of patients. Serum HBV DNA was detected in 46%, 0%, and 3% of groups Ⅰ, Ⅱ, and Ⅲ, respectively. Positive anti-HCV tests were obtained in 54%, 54%, and 34% of group Ⅰ, Ⅱ, and Ⅲ, respectively. Coinfection was proven in 22% of group Ⅰ, while it was none of both groups Ⅱ and Ⅲ. Both HBV DNA and anti-HCV were not detected in 21%, 46%, and 63% of groups Ⅰ, Ⅱ, and Ⅲ, respectively. We concluded that HCV plays a prominent etiologic role in HBsAg-negative patients with chronic liver disease in Korea. However, both HBV and HCV are important in the development of chronic liver disease in patients with isolated anti-HBc.