보리잎의 色素, 蛋白質含量 및 光系Ⅱ 活性에 미치는 Sulfite의 影響

權炳奎,鄭華淑,朴基元 慶北大學校 師範大學 1985 敎育硏究誌 Vol.27 No.-

Sulfur dioxide, a major atmospheric pollutant, influences to photosynthesis and causes some damages such as chlorosis, necrosis etc. When SO_2 enters into leaf tissue through the stomata, it produces H^+, HSO_3^- and SO_3^-2 as it is dissolved in the water of cells. On the basis of a report that sulfite (SO_3^-2) serves as the most toxic material to SO_2 phytotoxicity, we treated sodium sulfite at the indicated concentrations and treatment time to barley leaves. Then the leaf disks were illuminated at 30,000 lux and placed in darkness. This study was carried out to investigate the effects of sulfite on pigments, protein content, and photosystem Ⅱ activity in barley leaves. With sulfite treatement of barley leaf disks, pigment and protein content were decreased in light but not in darkness. The rate of DCIP photoreduction was inhibited in light-dependence of sulfite. It was inhibited to 78% with sulfite (10mM) treatment for 1 hour.

교정용 스테인리스강선재의 물리적 성질에 관한 비교연구

권오원,손병화 대한치과교정학회 1985 대한치과교정학회지 Vol.15 No.2

The requirements of orthodontic wire should include chemical stability, non-discoloration and non-corrosion in oral environment. Ability to be soldered, ease of fabrication and elasticity should be also considered. The purpose of this study was to compare and analyze the physical properties of Tru-chrome wire and manufactured E.S.S (Experimental Stainless Steel) wire similar to Tru-chrome. The results were as follows: 1. Tru-chrome wire and E.S.S. wire were SUS 304 which was 18 Cr-8Ni austenite stainless steel. There was not significant difference in each composition between two wires. 2. There were not significant differences in ultimate tensile strength, yield strength, elongation and modulus of elasticity between Tru-chrome and E.S.S. wires. 3. There was not significant difference between flexure modulus of elasticity of Tru-chrome and E.S.S. wires. 4. Micro-hardness value of E.S.S. wire was more than that of Tru-chrome wire and they were softened significantly by solution heat reatment. 5. Micro-structure of Tru-chrome and E.S.S. wires showed fibrous interlocking grains, and an austenite structure after solution heat treatment. 6. There was significant difference between corrosion rate of Tru-chrome and E.S.S. wires.

상치잎의 色素, 蛋白質含量 및 光系Ⅱ活性에 미치는 Sulfite와 산성 pH의 影響

權炳奎,鄭華淑,柳岑台 慶北大學校 師範大學 1986 敎育硏究誌 Vol.28 No.-

The present study was investigated to clarify the changes of pigments and soluable protein content, and PS Ⅱ activity of lettuce(Lactuca saliva L.) leaves induced by sulfite and acidic pH treatment. Lettuce leaves were treated with sodium sulfite at different concentrations, treatment time, and pH values. The leaf disks were illuminated at 20,000 lux and placed in darkness. Under the light condition pigments content, protein content and the rate of DCIP photoreduction were gradually reduced with the increase of sulfite concentration and treatment time below pH 5, but not in darkness. With treatment of 10mM sulfite for 3 hours at pH 7.0, pigments content were reduced by 21% in chlorophyll a, 17% in chlorophyll b, 14% in carotenoid, and protein content were also reduced by 47% in lettuce leaves. The rate of DCIP photoreduction were inhibited by 78% under the same conditions.

高等學校 生物敎科書의 實驗內容의 比較 檢討

權炳奎,鄭華淑 慶北大學校 師範大學 1980 敎育硏究誌 Vol.22 No.-

This paper is a comparative investigation in the experimental contents which are dealt with in the five kinds of high school biology textbooks. The contents of experiments described in each textbook are very varied in respect of quantity and quality, for example, units without expariment, units with too many experiments, quite divergent experimental contents in different texts and strikingly only one out of 58 experimental items in common in all kinds of textbooks. Unit that was dealt without experiment, and that contained too many experimennts, in addition the contents of experiments differ ineach kind of textbook, and only one out of 58 experimental items is common in different kinds of textbooks. The use of a particular textbook by each school for biological instruction makes it difficult for learning basic principal concepts and methods. Although the specified topics of experiments are described in each kind of textbook, the contents of experiments must be aimed at developing inquiring ability and attitude toward new problems by acquiring the basic knowledge, concepts and scientific methods through the inquiry process. Even though the contents of experiments is same, the development of inquiring process and scientific process is greatly influenced by the systematic approach of instruction. The current textbooks were not prepared in accordance with the above mentioned systematic approach of instruction. Finally, teachers in charge of biological instruction must prepare experimental systematic approach of instruction in order to enhance experimental effectiveness. And the authors of textbooks would be responsible for the careful selection of the essential experimental items for acquiring the principal concepts and scientific methods in high school biology.

해마 theta리듬과 pyramidal neuron의 세포내 특성과의 상관관계

권오흥,조진화,남순현,김현정,최병주,김영진,이만기 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.4

Eledctrophysiological phenomena of pyramidal cells in the CAI area of the dorsal hippocampus were recorded from and filled with neurobiotin in anesthetized rats. The electropharmacological properties of membrane as well as the cellular-synaptic generation of rhythmic slow activity (theta)were examined. The intracellular response characteristics of these pyramidal cells were distinctly different from responses of inteneurons. Pyramidal cells had a high resting membrane potential, a low input resistance, and a large amplitude action potential. A afterhyperpolarization was followed a single action potential. Most of pyramidal cells did not display a spontaneous firing. Pyramidal cells displayed weak inward rectification and anodal break excitation. The slope of the frequency-current relation was 53.4 Hz/nA for the first interspike interval and 15.9 Hz/nA for the last intervals, suggesting the presence of spike frequency adaptation. Neurobiotin-filled neurons showed pyramidal morphology. Cells were generally bipolar dendritc processes ramifying in stratum lacunosum-moleculare, radiatum, and oriens. Commissural stimulation discharged pyramidal cells, followed by excitatory and inhibitory postsynaptic potentials (EPSPs and IPSPs). The frequency of theat-related membrane potential oscillation was voltage-independent in pyramidal neurons. At strong depolarization levels (less than 30 mV) pyramidal cells emitted sodium spike oscillation, phase-locked to theta. The observations provide direct evidence that theta-related rhythmic hyperpolarization of principal cells is brought by the rhythmically discharging interneurons. Furthermore, the findings in which interneurons were also paced by rhythmic inhibitory postsynaptic potentials during theta suggest that they were periodically hyperpolarized by their GABAergic septal afferents.

發芽中인 땅콩子葉의 Microbody酵素들의 活性 變化와 이에 미치는 Cycloheximide의 影響

李和娟,權炳奎 경북대학교 교육대학원 1991 논문집 Vol.23 No.-

In cotyledons of peanut seedlings glyoxysomal and peroxisomal enzymes exhibit different rates of development during germination. The activity of isocitrate lyase, a glyoxysomal enzyme, was rapidly increased during the first 4days, and then decreased by day 7. In the light this decrease was slightly accelerated. The peroxisomal enzyme, glycolate oxidase, showed high activity continuously after the 4th day. But in the dark the activity remained at a constant level by day 7. The activity of the common microbody marker, catalase, developed similarly to isocitrate lyase. In the dark the activity was decreased by day 7 but in the light it was increased after the 5th day. The enzyme patterns in peanut cotyledons indicate that the glyoxysomal function of microbodies is replaced by the peroxisomal function of these organelles during the transition from fat degradation to photosynthsis. Cycloheximide was used to know whether these enzymes are synthesized de novo during early germinating stages or arise through the activation of some precursor already present in the dry seed. As a result, cycloheximide lowered the activities of three enzymes tested. So the stored mRNA in embryos are transcribed during the first hours of seed imbibition to synthesize new proteins.

FET형 마이크로센서 개발

손병기,박이순,서화일,권대혁,고광락 경북대학교 센서기술연구소 1996 연차보고서 Vol.1996 No.-

6-Dimethylaminopurine 및 Cycloheximide의 처리가 돼지난포란의 단위발생에 미치는 영향

김종화,박병권,한만희,이규승 충남대학교 농업과학연구소 2007 농업과학연구 Vol.34 No.1

This study is aimed at finding an optimum density for 6-Dimethylaminopurine (6-DMAP) and cycloheximide which have an effect on the revitalization of porcine oocytes. The results were summarized as follows: 1. When 6-DMAP was treated with 2 mM for 2 hours. It showed a significantly (P<0.05) different high result in activation rate, cleavage rate and blastocyst growth rate of 51.2%, 52.7% and 25.2% respectively. 2. When Cycloheximide was treated with 5 ug/ml for 6 hours, It showed a significantly (P <0.05) different high result in activation rate, cleavage rate and blastocyst growth rate of 47.7%, 46.8%, and 27.3% respectively. 3. When it was cultured in the culture medium, NCSU, for 7 days after inducing activation with 6-DMAP and cycloheximide, it showed no differences in the number of inner cell mass (ICM) and total cell of blastocysts. To conclude, it has been examined for porcine oocytes to be suitable when 6-DMAP was treated with 2 mM for 2 hours, Cycloheximide with 5 ug/ml for 6 hours.

수술적으로 치료한 통증을 동반한 흉추부의 후외상성 Schmorl씨 결절 : 2례 보고 Report of Two Cases

신병준,이재철,송화용,정석봉,권계원,조영일,김연일 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Study Design : Two patients who had painful Schmorl's node at thoracic level from acute trauma were adopted and taken operation for its treatment Objectives : To document the effect of operation for the treatment of painful Schmorl's node at thoracic level summary of background data : Schrmorl's nodes are common spinal lesion generally believed to be asymptomatic, but in some cases there were painful symptom by Schmorl's node. This case report is to explain the effect of operative treatment for the painful Schmorl's node. Methods : Two patients were adopted who had traumatic painful Schmorl's node at thoracic level for our case report. They were treated conservative methods at first but it's effect were poor, so they were taken anterior decompression and fusion, and checked back pain symptom. Result : In all two patients, the symptom of back pain by Schmorl's nodes at thoracic level was almost subsided. conclusion : For the treatment of traumatic painful Schmorl's node, most of surgeon says that conservative treatments were treatment of choice, but operative treatments are also benefit to subsidence of back pain by Schmorl's node.

FET형 반도체센서 및 시스템 개발

손병기,조진호,최평,박이순,서화일,권대혁,고광락 경북대학교 센서기술연구소 1996 연차보고서 Vol.1996 No.-

기존의 센서들의 난점을 극복할 수 있는 새로운 형태의 FET형 전해질(electrolyte :H^+, K^+, Ca^2+, Na^+)센서소자 및 분석 시스템의 개발을 중점적으로 추진하였으며, FET형 포도당센서 및 압력센서의 개별 FET형 센서에 관한 연구도 병행하였다. FET형 전해질센서를 이용한 휴대용 전해질 측정기와 desktop형 4채널 전해질 분석기를 제작하였다. 또한 이 시스템을 소형화하기 위한 주문형 아날로그-디지탈 변환기 내장형 CMOS 프로세서를 설계하고 검증하였다. The main object of this research is to develope a new FET type electrolyte(H^+, K^+, Ca^2+, Na^+) sensors and analysis system which can overcome the problems of the conventional sensors. Parallel researches on FET type sensors such as glucose and pressure humidity are also in progress. A portable electrolyte meter and desktop 4-channel electrolyte analysis system is fabricated. A customized CMOS processor with built-in analog-to-digital converter is designed and verified.