Lycopersicum esculentum 'cherry tomato'의 葯培養에 관한 硏究

鄭海駿,李永馥 培材大學校 1984 論文集 Vol.5 No.-

Anthers at the stage of uninucleate microspore of Lycopersicum esculentum 'cherry tomato' were cultured on the Murashige and Skoog's medium suppllemented with NAA and BA. Most of the binucleate microspores were equationally divided whereas the unequational division was relatively rare. The two nuclei formed were again divided into multinuclei, which were further developed into calli. After one month of culture, calli there formed on the MS medium containing BA 2mg/l and NAA 0.25mg/l. Shoot of embryoid-like body was not formed from the calli after subculture on the medium with reduced amounts of auxins.

Nonlinear I-V Characteristics of Ta2O5-, Nb2O5-, V2O5-Doped SnO2 Based Varistor Ceramics

Lee, Hai Joon,Kim, Chang Do,Kang, Sun Hee,Kim, Ill Won,Lee, Jae Shin,Chung, Gwiy Sang Korean Physical Society 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2

The Effect of the Substrate Temperatures on (Na,K)NbO3 Ferroelectric Thin Films Fabricated by RF Magnetron Sputtering

Hai Joon Lee,Ill Won Kim,Byung Moon Jin 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1

Ferroelectric Na0.5K0.5NbO3 thin films (300 nm in thickness) on Pt(111)/Ti/SiO2/Si substrates were fabricated by using RF-magnetron sputtering method at different substrate temperatures. The effect of growth temperatures on the ferroelectric properties of the NKN films was investigated. It was confirmed that the NKN thin film grown at 600 ℃showed the orthorhombic perovskite structure and exhibited a well-defined P-E hysteresis loop with a high remnant polarization (Pr ~23.8 µC/cm2) and had a fatigue-free behavior up to the 1 × 1010 polarization switching cycles.

Clinical Article : Effect of Dialysate Sodium Concentration on Sodium Gradient and Hemodialysis Parameters

( Hai Feng Jin ),( Seung Yun Lee ),( Si Nae Lee ),( Joon Ho Song ),( Moon Jae Kim ),( Seoung Woo Lee ) 대한전해질학회 2014 Electrolytes & Blood Pressure Vol.12 No.2

This retrospective study was performed to determine the ranges of the sodium gradient (SG) between the dialysate sodium concentration (DNa) and serum sodium concentration (SNa) in hemodialysis (HD) patients and to examine the relationships between HD parameters over a 1 year period. Fifty-five clinically stable HD patients, who had been on HD >2 years were enrolled. Monthly HD [ultrafiltration (UF) amount, systolic blood pressure (SBP), frequency of intradialytic hypotension (IDH)] and laboratory data were collected and 12-month means were subjected to analysis. The SG was calculated by subtracting SNa from prescribed DNa. Mean SG values were 1.5±3.3 (range -5.6~9.1). SG was positively related to DNa and the frequency of IDH. A higher SG was associated with larger UF amounts and SBP reduction during HD. The percentages of patients with a SG ≥3mEq/L increased as DNa increased. On the other hand, SG was not found to be associated with SNa or pre-HD SBP. DNa appears to cause a significant increase in SG, and this seems to be related to HD para- meters, such as, UF amount and IDH.

소간세포암의 진단과 치료 및 예후

이상우,김윤환,이재원,김경수,박미라,박동규,이성준,이구,김광희,김창덕,최재현,류호상,전훈재,송치욱,서성옥,엄숭호,현진해,진윤태 대한간학회 1998 Clinical and Molecular Hepatology(대한간학회지) Vol.4 No.4

Background/ Aims : Cases of small hepatocellular carcinoma (HCC) have been increasing with the progress of diagnostic methods . In t his study the screening methods for early diagnos is of HCC were re-evaluated, and comparative ther apeutic analyses were perfomed. Methods : A total of 110 pat ients with small HCC ($lt; 5 cm and $lt; 4 nodules ) were retrospectively analyzed. The patients were divided into four treatment groups ; unt reated group (No T x, n=12), transarterial-oily-chemoembolization group (TOCE, n=43), combined treatment group of percutaneous ethanol injection and TOCE (CEI, n=22), OP group ( OP, n=33). Results : Small HCC occupied 22.6% of t ot al HCC cases . Only one thir d of small HCC cases were detected during the regular screening. In this group, Alpha- fet oprotein as say pr ovided a diagnostic clue in 50% of cases, ultras onography in 71%, and the combination of both in 88%. Five year s ur vival rat e and 5- year non- recurrence rate in small HCC was 29% and 37% respectively. Comparative ther apeutic analys es showed t hat CEI and OP gave a bet t er s ur vival t han T OCE in Child gr ade A. CEI prolonged survival in Child grade B wher eas TOCE did not . Only TOCE was tried and did not improve the survival in Child grade C. Conclus i on : 1) A more strict screening is needed in high risk group of HCC. 2) As a first line of treatment in small HCC, OP or CEI can be selected in Child grade A, and CEI in Child grade B. In Child grade C, a less invasive treatment (PEIT , microwave coagulat ion therapy) should be investigated. (Korean J Hepatol 1998;4:365 380)

간세포암의 예후 및 치료 성적에 관한 연구

이상우,김윤환,이재원,박미라,이성준,이구,김창덕,최재현,엄순호,류호상,전훈재,송치욱,현진해,진윤태,김광희,서성옥 대한소화기학회 1999 대한소화기학회지 Vol.32 No.6

Background/Aims: Recent progress in both diagnostic and therapeutic technique of hepatocellular carcinoma (HCC) appears to improve the prognosis. The purpose of this study was to evaluate the prognosis of HCC in relation to treament methods. Methods: A new staging scheme (PI stage) based on the prognostic index was used. A total of 487 patients with HCC were divided into 4 treatmen groups; no treatment (No Tx), transarterial oily chemoembolization (TOCE), combination of percuta neous ethanol injection and TOCE (CEI), partial hepatectomy (OP). Results: In PI stage I, the groups of CEI and OP showed similar survival rates, and both prolonged survival compared with the group of TOCE. In PI stage II, CEI gave a better survival than TOCE, whereas OP could not improve survival rate, compared with TOCE. In PI stage III, only TOCE was done in some patients and i prolonged survival, particularly when serum bilirubin was 1.5 mg/dL or less. Conclusions: In the P stage I, operation is recommended firstly, but if operation is impossible, CEI could be selected. CE may be chosen as the first treatment choice in PI stage II. In PI stage III, TOCE may be considered for patients whose serum bilirubin is 1.5 mg/dL or less.

Influence of Sintering Temperature on Conduction Behaviors for CoO- and ZnO- Doped SnO2 Varistor Ceramics

HAI JOON LEE,ILL WON KIM,CHANG DO KIM,GWIY SANG CHUNG,JAE SHIN LEE,SUN HEE KANG 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III

We have fabricated 99.0SnO2+0.5CoO+0.5ZnO (SCZ) varistor ceramics by using a solid-state reaction method and studied the influence of sintering temperature on the nonlinear electrical properties by measuring the impedance, the grain and the grain boundary resistance, the breakdown field, and the nonlinear coefficient as functions of the temperature, the electric field, and the frequency. The conduction behaviors of O0 ions (0.6 eV) was found to be dominated by reduction of Co00 Sn and Zn00 Sn defects (0.4 eV) with increasing sintering temperature. The breakdown field (EB, 800 900 V/cm) and the nonlinear coefficient (, 9.3) of the SCZ ceramics were stabilized above a sintering temperature of 1350 C.

밀착된 예리한 식도 이물의 Ballon 이용 적출술

이정환,이상우,최재현,이성준,이홍식,김창덕,진윤태,류호상,전훈재,송치욱,현진해,허병원 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.1

Background/Aims : Sharp impacted esophageal foreign bodies can be very difficult to manage. When attempting to remove such objects inappropriately, life threatening complications, such as perforation can occur. Terefore, surgical intervention generally affords a safer approach. The aim of this study was to evaluate the safety and efficacy of endoscopic remval of sharp impacted esophageal foreign bodies using a dilatation method with an oral side balloon. Methods : A total of 17 patients (7 Male, 10 Female)with sharp impacted esophageal foreign bodies underwent endoscopic Extraction. The following technique was successfully performed; an oral side balloon (Top Co., Japan) for esophageal variceal sclerotherapy was attached on the distal part of the endoscope. Under local anesthesia, the endoscope was inserted near the proximal part of the esophageal foreign body. Then, the oral side balloon was gradually dilated. Dilataion of the proximal part of the esophagus made it possible to release the sharp impacted foreign body from the esophageal wall. Results : The types of foreign bodies were fish bones (6 cases), press-through packages (6 ases), chichen bones (3 cases), dentures (1 case), and a watch (1case). Endoscopic removal was successful in all 17 cases without complications such as perforation. Conclusions : This method of using an oral side balloon is safe and effective in removing sharp impacted esophageal foreign bodies, preventing, surgery and possible perforation.

Nonlinear I-V Characteristics of Ta2O5-, Nb2O5-, V2O5-Doped SnO2 Based Varistor Ceramics

HAI JOON LEE,김일원,CHANG DO KIM,정귀상,이재신,SUN HEE KANG 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I

The influence of doping on the nonlinear electric properties of Nb$_{2}$O$_{5}$, Ta$_{2}$O$_{5}$, V$_{2}$O$_{5}$ doped SnO$_{2}$+CoO+ZnO varistor ceramics has been studied by measuring the nonlinear coefficient, the breakdown field, the barrier height and ac conductivity as functions of the temperature, the electric field and the frequency. The un-doped SCZ ceramics showed varistor characteristics, such as a nonlinear coefficient ($\alpha$ = 2.94) and breakdown electric field ($E$$_{B}$ = 1760 V/cm) at the room temperature. The Ta$_{2}$O$_{5}$ and V$_{2}$O$_{5}$ doped SCZ:Ta and SCZ:V ceramics displayed no varistor characteristics at the room temperature. However, the Nb$_{2}$O$_{5}$ doped SCZ:Nb ceramics exhibited enhanced varistor characteristics ($\alpha$ = 17.2, $E$$_{B}$ = 5064 V/cm) at the room temperature. The advanced varistor characteristics of SCZ:Nb ceramics can be explained by the formation of oxygen species, such as O$^{\prime}$, O$^{\prime\prime}$.

금식 여부 및 측정 시간에 따른 13C-요소호기검사 결과의 평가

이상우,최재현,이성준,이구,이홍식,김창덕,진윤태,엄순호,류호상,송치욱,현진해,전훈재 대한소화기학회 2000 대한소화기학회지 Vol.35 No.5

Background/Aims : This study was designed to evaluate whether the result of 13C-urea breath test (UBT) was influenced by fasting status and to assess the adequate test duration for sample collection. Methods : Twenty-five volunteers were enrolled in this study. Their results were concordant in histology and standard (fasting) UBT for the diagnosis of Helicobacter pylori (H. pylori) infection. Standard UBT was performed after 4-hour-fasting and nonfasting UBT was performed within 1 hour after each meal for the same subjects at one week interval. The breath samples were collected just before and at 5, 10, 15, 20, 25, 30, 35, 40, 50, and 60 minutes after test meal (HelikitTM) and analyzed by isotope ratio mass spectrometer. H. pylori infection was defined as Δ13CO2 at 30 minutes was over 4%. Results : Of 25 volunteers, 13 were infected by H. pylori. Diagnosis of H. pylori the case in which infection was completely concordant in both standard and nonfasting states. In H. pylori infected group, Δ13CO2 was signifantly decreased in nonfasting state than standard state, and the mean Δ13CO2 of both states was the highest at 20 minutes after test meal. Ten minutes were sufficient to obtain ΔCO2 for diagnosis of H. pylori infection. Conclusions: The diagnosis of H. pylori infection is not affected by whether UBT using 75 mg of 13C-urea containing HelikitTM is performed in nonfasting state or its test duration is shortened.