http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
인권식,최창진,김봉원,손무정,김인탁 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.2
Proteus vulgaris 를 ammonia와 carbon dioxide gas-sensor에 고정시켜 감응도와 재현성이 우수한 요소에 대한 박테리아 전극을 직접 제조하여 pH, 온도, 완충용액, 박테리아의 양, 여러 가지 아미노산 및 무기염류에 대한 영향과 전극의 수명 등에 관하여 조사하였다. 먼저 ammonia-박테리아 전극은 25℃에서 pH 7.4인 0.05M phosphate 완충용액을 사용하였을 때가 최적이었으며, 7.0 ×10 exp (-4) -3.0 ×10 exp (-2)M 내에서 직선을 나타내었고, 이때 감응도는 116.7mV/decade였다. 한편, carbon dioxide-박테리아 전극은 30℃, pH7.0, 0.1M phosphate 완충용액에서 가장 우수한 감응을 보였다. 이 경우는 7.0 ×10 exp (-4) - 5.0 ×10 exp (-2)M 내에서 45.4 - 45.7mV/decade를 나타내었다. 이들 두 전극중에서 carbon deoxide-박테리아 전극을 이용하여 요소를 정량한다면 방해물질들의 방해가 최소화되었다. 실제 임상적 응용에서 분광 광도법과 비교한 결과 실험과정이 간단하고 편리하여 신속하게 많은 양의 시료분석이 가능하다. Bio-electrodes for urea have been constructed by immobilizing the Proteus vulgaris on ammonia and carbon dioxide gas-sensors. The bacteria containing urease convert each molecule of urea into two molecules of ammonia and one molecule of carbon dioxide gas. Ammonia-bacterial electrode based on ammonia gas-sensor has linearity in the range of 7.0 ×10 exp (-4) - 3.0 ×10 exp (-2)M urea in pH 7.4, 0.05M phosphate buffer solution at 25℃. While carbon dioxide-bacterial electrode based on carbon dioxide gas-sensor has linearity in the range of 7.0 ×10 exp (-4) - 5,0 ×10 exp (-2)M urea in pH 7.0, 0.1M phosphate buffer solution at 30℃. These electrodes were investigated for the effects of pH, temperature, buffer solutions, bacterial amounts and interferences, and life time. As the clinical applications, urea in urine was determined by these devices and was compared with spectrophotometric method. As the results, those methods were by far more simple and rapid than these method.
Comprehension of the Response Time in a Microbial BOD Sensor(II)
Sohn, Moo-Jeong,Hong, Dae-Il Korean Chemical Society 1993 Bulletin of the Korean Chemical Society Vol.14 No.6
A microbial BOD sensor using immobilized Hansenula anomala was prepared for the estimation of BOD. The sensor voltage was increased with time and increasing concentration of GGA when it was inserted in a sample solution. A linear relationship was obtained with a correlation coefficient, 0.998 between the concentration of standard GGA solutions and dV/dt by using the initial change of voltage, in which the response time was 20 min. It could be concluded that the oxidation of GGA conformed to a first-order kinetics. Therefore, the good linearities were also observed at various times. This sensor showed the best linearity at 30 min.
Sohn, Youdong,Yoo, Ki-Yeon,Park, Ok Kyu,Kwon, Seung-Hae,Lee, Choong Hyun,Choi, Jung Hoon,Hwang, In Koo,Seo, Jeong Yeol,Cho, Jun Hwi,Won, Moo-Ho Kluwer Academic/Plenum Publishers 2011 Neurochem Res Vol.36 No.12
<P>The maintenance of intracellular pH is important in neuronal function. Na(+)/HCO(3)(-) cotransporter (NBC), a bicarbonate-dependent acid-base transport protein, may contribute to cellular acid-base homeostasis in pathophysiological processes. We examined the alterations of NBC immunoreactivity and its protein levels in the hippocampal CA1 region after transient cerebral ischemia in gerbils. In the sham-operated group, moderate NBC immunoreactivity was detected in CA1 pyramidal neurons, and, 12 h after I/R, the immunoreactivity in the pyramidal neurons was markedly increased over controls. Three days after I/R, NBC immunoreactivity nearly disappeared in the CA1 pyramidal neurons. However, NBC immunoreactivity was detected in the non-pyramidal neurons of the ischemic CA1 region at 3 days after I/R. From double immunofluorescence study with glial markers, NBC immunoreactivity was detected in astrocytes, not in microglia, at 4 days after I/R. NBC protein level in the CA1 region was significantly increased at 12 h post-ischemia and significantly decreased at 2 days post-ischemia. Thereafter, NBC protein level was again increased and returned to the level of the sham-operated group at 4 days post-ischemia. On the other hand, treatment with 4,4'-diisothiocyanatostilbene-2,2'-disulfonate (DIDS), an inorganic anion exchanger blocker including Cl-bicarbonate exchanger, protected CA1 pyramidal neurons from I/R injury at 4 days post-ischemia. These results indicate that changes in NBC expressions may play an important role in neuronal damage and astrocytosis induced by transient cerebral ischemia.</P>
정원욱,최영태,서무교,박응수,손병기 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
In this paper, pH-meter signal processing system using ISFET(Ion Sensitive Field Effect Transistor), based on single chip MCU(Micro Controller Unit), is designed and fabricated. The reliability and operational characteristics of this system was measured, compared with conventional pH-meter using ISE(Ion Slective Electrode). The method of temperature compensation that this system adapt is to process output of temperature sensor(AD590). The pH-meter with ISFET have good sensitivity, about 53 mV/pH, and showed excellent linearity in the range of pH 2 to pH 12. We certified that this system can used for pH mesurement system using ISFET as pH sensor.
THE BONDAGE NUMBER OF C<sub>3</sub>×C<sub>n</sub>
Sohn, Moo-Young,Xudong, Yuan,Jeong, Hyeon-Seok Korean Mathematical Society 2007 대한수학회지 Vol.44 No.6
The domination number ${\gamma}(G)$ of a graph G=(V,E) is the minimum cardinality of a subset of V such that every vertex is either in the set or is adjacent to some vertex in the set. The bondage number of b(G) of a graph G is the cardinality of a smallest set of edges whose removal from G results in a graph with domination number greater than ${\gamma}(G)$. In this paper, we calculate the bondage number of the Cartesian product of cycles $C_3\;and\;C_n$ for all n.
박무인 ( Moo In Park ),신정은 ( Jeong Eun Shin ),명승재 ( Seung Jae Myung ),허규찬 ( Kyu Chan Huh ),최창환 ( Chang Hwan Choi ),정성애 ( Sung Ae Jung ),최석채 ( Suck Chei Choi ),손정일 ( Chong Il Sohn ),최명규 ( Myung Gyu Choi ) 대한소화기학회 2011 대한소화기학회지 Vol.57 No.2
While constipation is a common symptom in Korea, there are no existing treatment guidelines. Although constipation may occur as a result of organic cause, there is no obstructive mucosal or structural cause in the vast majority of patients with constipation. The present paper deals with only the management of functional constipation: lifestyle changes; bulking agents and stool softeners; osmotic agents; stimulant laxatives; prokinetics; biofeedback and surgical treatments. Exercise and dietary fiber are helpful in some patients with constipation. Laxatives including bulking agents, stool softeners, osmotic agents, and stimulant laxatives have been found to be more effective than placebo at relieving symptoms of constipation. New enterokinetic agents that affect peristalsis through selective interaction with 5-hydroxytryptamine-4 receptors can be effective in patients with constipation who cannot get adequate relief from current laxatives. Biofeedback can relieve symptoms in selected patients with pelvic floor dyssynergia. Surgical treatments can be helpful in some patients with refractory constipation. (Korean J Gastroenterol 2011;57:100-114)