Effect of Photoperiod, Temperature and True-leaf Stage in Bolting Rate of Chicory (Cichorium intybus L. var. sativus)

Lim,Jung-Dae,Seo,Jeong-Sik,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Yu,Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

Root chicory (Cichorium intybus L. var. sativus) is potential alternative medicinal and sugar crop which accumulates a high amount of linear polyfructan, inulin in its roots. A problem in root production is that over-wintered stock plants often flower. Once the plant becomes reproductive, stem elongation and root growth slows and floral buds arise from every node, rendering the plants useless for propagation. The objectives of this research was to examine the effectiveness of manipulating environmental factors containing photoperiod, temperature and number of leaf states. The experiment was performed in growth chamber to create two photoperiods (8 h, and 16 h) with three temperature regimes (5℃/3℃, 10℃/8℃, and 15℃/13℃ day/night temperature) for a total of six treatments on three type of true-leaf stage of plant. Data of bolting rate, shoot and root length, shoot and fresh weight was invetigated in each treatments. This is the first report on changes in bolting rate and shoots and roots production during a whole growing season and differences in the effect of cold and photoperiod treatment depending on the true-leaf stage of plant.

폐철을 이용한 크롬(VI)의 환원적 제거

임우택,정용식,유건상,김종현,김영훈 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-

Cr(VI) is a known toxic heavy metal which is found frequently in many industrial sites. Contaminates soil and ground water with Cr(VI) is a big enviromental concern due to the high toxicity. Permeable Reactive Barrier(PRB)is an innovative remedial technology intensively studied and developed recenty. The most popular PRB material is zero-valent iron which is environmentally favorable and cheap. Scrapped steels and precleaned scrapped steels were tested in this study for Cr(VI). Scrapped steels were precleaned wuth detergent, acetone, hexane.The precleaned scrapped steel showed relatively high reactivity for Cr(VI). The results indicate that the scrapped steel could be used as PRB material after proper pretreatments.

전립선 비대증 진단에 있어서 전립선 이행대 용적 지수의 유용성

임재성,노안식,김용웅,육승모 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

Purpose : Prostate volume has been poorly correlated to various parameters used to assess benign prostatic hyperplasia (BPH), including symptom score, peak urine flow and detrusor pressure at peak urine flow. The purpose of this study was 2-fold: 1) to determine if transrectal ultrasound measurement of the transition zone of the prostate served as a better proxy for determining prostate size and correlated better with IPSS, peak urine flow and detrusor pressure and 2) if the parameter transition zone index (the ratio between transition zone volume and prostate volume) was useful in evaluating clinical prostatism. Materials and Methods: We prospectively evaluated 30 men with symptomatic BPH (mean age 65.4 years) according to symptom sore, peak urine flow, pressure/flow study, transrectal ultrasound volume of the entire prostate and the transition zone and calculation of the transition zone index. Results : There was a week correlation between prostate volume and symptom score, peak urine flow and detrusor pressure at peak urine flow: a stronger correlation between volume of transition zone and symptom score (r=0.679 p=0.03), and peak urine flow (r=-0.672 p=0.05) and a significant correlation (p=0.001) between transition zone index and symptom score (r=0.868), and peak urine flow(r=-0.870). Conclusion : Transition zone index is a parameter that correlates siginificantly with parameters of BPH and may serve as a useful proxy for evaluating worsening obstruction. Studies are underway to determine whether transtion zone index can be used prospectively to predict and correlate response with therapies designed to ablate prostatic tissue medically or surgically.

耐熱性 合成樹脂에 關한 硏究 : Aromatic Polyamide의 合成과 耐熱性에 關하여

林龍進,金祐埴,민경은 慶北大學校 1974 論文集 Vol.18 No.-

Thermally stable polymer which does not lose weight rapidly up to about 400℃ was prepared from p-aminobenzoic acid by means of melt polymerization. The polymer was identified completely para oriented aromatic polyamide by analytical data. And some information obtained from synthetic process and thermal and/or chemical stability of these polymers was discussed.

교정용 호선의 세포독성에 관한 실험적 연구

임용규,양원식 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.5

본 연구는 널리 이용되고 있는 두 종류의 교정용 호선에 다양한 처리를 가한 후 호선의 세포독성을 비교, 평가하고자 시행하였다. 018x025 inch 굵기의 stainless steel 호선과 Co-Cr 호선을 실험 재료로 선택하여 stainless steel 호선을 A호선, Co-Cr 호선을 B 호선이라 칭하였으며 각각의 호선을 다시 가해진 처리에 따라 4군으로 나누었다. A-1군과 B-1군은 제작된 상태 그대로의 호선을 이용하였으며 A-2, B-2군은 기기를 이용하여 850°F에서 4분간 열처리하였다. A-3, B-3군은 같은 방법으로 열처리한 후 표면의 불순물을 제거하기 위해 전해연마를 시행하였고 A-4, B-4군은 소량의 은납(Ag-solder)을 납착(soldering)하였다. 사람의 치은 섬유아세포를 배양하고 agar overlay법을 이용하여 각군의 호선의 세포독성을 검사하였으며 세포독성을 반응지수 (탈색지수/용해지수)로 평가하여 다음의 결론을 얻었다. 1. stainless steel 호선과 Co-Cr 호선 모두 제작된 그대로의 상태에서는 세포독성을 나타내지 않았다. 2. 두 호선에 대한 열처리나 전해연마는 호선의 세포독성에 영향을 미치지 못하였다. 3. 은납이 납착된 stainless steel 호선은 은납이 납착된 Co-Cr 호선에 비해 더 넓은 범위의 탈색을 나타냈으나 탈색지수와 세포독성(반응지수)에서는 차이를 보이지 않았다. 4. 은납이 납착된 호선은 두 호선 모두에서 중증도의 세포독성을 나타냈다. This study was undertaken to investigate the cytotoxicity of orthodontic wires after doing various treatments to the wires. 018x025 inch Stainless steel(A) and Co-Cr(B) wires were used and each of them were divided into 4 groups. A-1 and B-1 groups were as received state, and A-2 and B-2 groups were heat treated. A-3 and B-3 groups were electropolished after heat treatment, and A-4 and B-4 groups were soldered with Ag-solder. Each group had 3 wires and these were sterilized with Ethylene Oxide gas. We used human gingival fibroblast cell culture and agar overlay technique to investigate the cytotoxicity of each group of wires. The cytotoxicity of wire was assessed using reaction index (zone index / lysis index). The findings of this study were as follows : 1. Both of the stainless steel wire and Co-Cr wire showed no cytotoxicity in as received state. 2. Heat treatment or electropolishing of the wires had no effect on the cytotoxicity of the wires. 3. Soldered stainless steel wires showed a little wider zone of discoloration than soldered Co-Cr wires, but the zone index and cytotoxicity(reaction index) was not different. 4. Soldered wires showed moderate cytotoxicity in both of the wires.

4,4'-비스-(2-보로노-4-히드록시-벤젠아조)-비페닐의 합성 및 산 염기 지시약으로서의 성질

임용진,윤남식,이석률 慶北大學校 1986 論文集 Vol.41 No.-

A dye, 4,4'-bis-(2-borono-4-hydroxy-benzeneazo)-biphenyl, was synthesized by coupling benzidine tetrazonium salt with m-hydroxybenzeneboronic acid. The dye was soluble in alcohol and it's maximum absorption wavelength (λ_max) and molar extinction coefficient(ε) in ethyl alcohol were 466㎚ and 3.81× 10 exp (4) respectively. The color of the dye was pale yellow(λ_max 400㎚) in acidic aqueous solution and deep blue (λ_max 581㎚) in alkaline aqueous solution, indicating the possibility of using as a neutralization titration indicator. The transition range of the dye as titration indicator was shown to be pH 7.3-8.5 and the equilibrium constant (K_HIn) was 1.90× 10 exp (-8). When the dye was compared with phenolphthalein in the neutralization titration experiment, similar results were obtained.

토양 표면의 전기화학적 특성과 응용

옥용식,임수길,김정규 고려대학교 생명자원연구소 2002 생명자원연구 Vol.10 No.-

적외선 센서를 이용한 청소로봇의 벽면추적 기법

정광식,노용준,임영철,유영재 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

하악 후방 견인력이 성장기 유년의 하악과두에 미치는 영향에 관한 실험적 연구

양원식,임용규 대한치과교정학회 1990 대한치과교정학회지 Vol.20 No.2

The purpose of this study was to evaluate the effects of the mandibular retractive force on the mandibular condyle of growing dog. The experimental animals were six mongrel dogs of two-month old. Their deciduous dentition were completed. Two of them was used as control group, and experimental group was composed of remaining four. Head band and chin cup were made of cotton tape, and hooks are fabricated on the chin cup and had band for closed coil. Mandibular retractive force was 100g/side and chin cap appliance was used for 14 hours/day during night. Experimental group were sacrificed at 2, 4, 6, 8 weeks from beginning of the experiment. Right TMJ was prepared for histologic study and left TMJ was examined grossly for disc, fossa, and condyle. The conclusions are: 1. Two-month old control animal showed active cartilaginous growth on the mandibular condyle, therefore showed thick proliferative and hypertrophic zones. Remodeling process in the condyle head was observed in which there were bone resorption on the anterior surface and bone apposition on the posterior surface. 2. Four-month old control animal showed marked reduction of hypertrophic zone but the condylar bone remodeling was more pronounced. 3. In experimental group, there are marked reduction of hypertrophic zone at 4 weeks from beginning of experiment, and hypertrophic zone disappeared at posterior-superior portion of condyle in 6-week experimental animal. 8 week experimental animal showed slight recovery of hypertrophic zone. 4. In experimental group, bone deposition was increased at anterior surface of condyle, and bone resorption was increased at posterior surface of condyle. 5. In control group, the glenoid fossa and surrounding bone showed mainly bone apposition. But experimental group showed bone resorption at anterior surface of articular eminence and increased bone apposition at posterior surface of postglenoid spine. 6. No marked traumatic change was seen but 4 weeks and 8 weeks experimental animal showed flattening of posterior surperior condylar surface. Bone marrow of condyle showed minute focal bleeding in 2 weeks and 4 weeks experimental animal, and congestion and depression of hematopoietic bone marrow during all experimental period.

양친매성 유기점토를 이용한 중금속과 유기 오염물질 동시제거 기술

옥용식,임수길,김정규 한국환경농학회 2003 한국환경농학회지 Vol.22 No.3

Although clay can sorb significant amounts of inorganic contaminants from soils and waste-water, the hydration of exchangeable cations in clay minerals makes it hydrophilic at the clay mineral surfaces and interlayers. Thus, natural clays are often ineffective in complexing and stabilizing toxic organic contaminants in soils and groundwater environment. But, substituting these hydrated cations with cationic surfactant such as QAC(Quaternary ammonium Compound) can change the natural clay from hydrophilic to hydropobic. Furthermore functionalized organoclay can act as a powerful dual function sorbent for both toxic metals and organic compounds. It also can be used as landfill clay liners, slurry walls, nano-composite materials, petroleum tank farms, waste treatment, and fflter systems. To use this modified clay minerals effectively, it is required to understand the fundamental chemistry of organoclay, synthetic procedures, its engineering application, bioavailability of sorbed ion-clay complex, and potential risk of organoclay. In this review, we investigate the use, application and historical background of the organoclay in remediation technology. The state-of-the-art of organoclay research is also discussed. Finally, we suggest some future implications of organoclay in environmental research.