• 대한수의학회지
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• 제18권1호
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• pp.1-7
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• 1978

In order to detect the clinical effect of combelen which is used for sedation of domestic animals, 10 heads of clinically healthy Korean native goats were used in this study. They were divided into two groups; one is dose level of 1ml per 10 kg of body weight with 1% combelen and the other is dose level of 3 ml. Clinical observations and changes in blood components after administration of combelen were made. 1. There was no adverse effect due to combelen, but sedative effect was insufficient. 2. During sedative period the changes in heart rate and respiratory rate showed noticeable change, and body temperature was slightly decreased. 3. In ECG recordings, except for slight changes in T wave, significant change was not observed. 4. Erythrocytes, leukocytes, hemoglobin concentration and packed cell volume showed tendency to decrease during the period of sedation. 5. SGOT activity showed a remarkable increase and BUN showed a great decrease 24 hours after administration in the group of 3ml/10kg. Blood glucose level increased during the period of sedation in both groups.

• Journal of Korean Neurosurgical Society
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• 제55권3호
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• pp.125-130
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• 2014

Objective : This study was conducted to elucidate neuroprotective effect of carnosine in early stage of stroke. Methods : Early stage of rodent stroke model and neuroblastoma chemical hypoxia model was established by middle cerebral artery occlusion and antimycin A. Neuroprotective effect of carnosine was investigated with 100, 250, and 500 mg of carnosine treatment. And antioxidant expression was analyzed by enzyme linked immunosorbent assay (ELISA) and western blot in brain and blood. Results : Intraperitoneal injection of 500 mg carnosine induced significant decrease of infarct volume and expansion of penumbra (p<0.05). The expression of superoxide dismutase (SOD) showed significant increase than in saline group in blood and brain (p<0.05). In the analysis of chemical hypoxia, carnosine induced increase of neuronal cell viability and decrease of reactive oxygen species (ROS) production. Conclusion : Carnosine has neuroprotective property which was related to antioxidant capacity in early stage of stroke. And, the oxidative stress should be considered one of major factor in early ischemic stroke.

• Ecology and Resilient Infrastructure
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• 제8권3호
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• pp.143-153
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• 2021

초음파의 고주파 (1.6 MHz), 저주파 (23 kHz) 조사를 통해 Microcystis aeruginosa (M. aeruginosa)의 성장 억제 효과 (growth inhibition effect)를 대용량 (7.2 L) 조류 시료를 활용해 실험실 규모 (lab-scale) 실험을 통해 검증하였다. 6시간 고주파 조사 후 chl-a 농도와 M. aeruginosa 개체수는 점진적인 감소 경향이 관측된 반면, 6시간 저주파 조사 후 chl-a 농도 및 M. aeruginosa 개체수가 고주파 대비 급격하게 감소하는 것을 확인하였다. 또한, 초음파 조사기간 보다 조사종료 이후의 일차분해상수(k)가 큰 것으로 확인되었으며, 이러한 결과는 기존 연구에 비해 비교적 낮은 단위부피당 초음파 에너지가 조류 세포막과 내부 기관에 미치는 영향이 지연되어 일정 시간 이후 점진적인 조류 성장 억제 효과가 관측되는 것으로 사료된다. 초음파 조사 후 chl-a 농도와 M. aeruginosa 개체수 변화, 성장률과 일차분해율을 종합적으로 비교한 결과, 저주파에서 조류 성장 억제 효과가 우수한 것으로 확인되었으며, 저주파에서 M. aeruginosa 세포막으로 에너지 투과 효율이 우수해 기낭 등 내부기관에 더 큰 손상을 유도하기 때문인 것으로 사료된다. SEM과 TEM image 관측을 통해서도 고주파 보다 저주파에서의 M. aeruginosa의 세포 표면 및 세포막의 손상이 명확하게 관측되었다. 마지막으로 초음파에 의한 M. aeruginosa의 기낭 파괴 및 세포막의 기능 손상을 통해 용출되는 독성물질인 microcystin-LR의 수중 유출은 검출한계 (0.1 ㎍ L^-1) 미만으로 용출되어 수생태계에 미치는 유해성은 미미한 것으로 판단된다.

• 상하수도학회지
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• 제28권2호
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• pp.161-170
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• 2014

It is essential to decrease energy consumption and excess sludge to economically operate sewage treatment plant. This becomes more important along with a ban on sea dumping and exhaustion of resource. Therefore, many researchers have been study on energy consumption reduction and strategies for minimization of excess sludge production from the activated sludge process. The aeration cost account for a high proportion of maintenance cost because sufficient air is necessary to keep nitrifying bacteria activity of which the oxygen affinity is inferior to that of heterotrophic bacteria. Also, additional costs are incurred to stabilize excess sludge and decrease the volume of sludge. There were anoxic, aerobic, membrane, deairation and concentration zone in this MBR process. Continuous aeration was provided to prevent membrane fouling in membrane zone and intermittent aeration was provided in aerobic zone through ammonia sensor. So, there was the minimum oxygen to remove $NH_4-N$ below limited quantity that could be eliminated in membrane zone. As the result of this control, energy consumption of aeration system declined by between 10.4 % and 19.1 %. Besides, we could maintain high MLSS concentration in concentration zone and this induced the microorganisms to be in starved condition. Consequentially, the amount of excess sludge decrease by about 15 %.

• 대한한의학회지
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• 제22권1호
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• pp.10-21
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• 2001

Objective : This study was performed to investigate the protective effect of Stephania tetrandra(ST) against ischemic brain damage after a middle cerebral artery(MCA) occlusion. The effect was evaluated using histological tests, neurobehavioral tests, and biochemical tests. Methods : Rats(Sprague-Dawley) were divided into four groups : sham operated group, MCA occluded group, post MCA occlusion Stephania tetrandra administrated (7.6mg/l00g) group, and normal group. The MCA was occluded by intraluminal method. Stephania tetrandra was administrated orally twice at 1 and 4 hours after MCA occlusion. The neurobehavioral test was performed at 3, 6, 9 and 24 hours after MCA occlusion by posture reflex test and swimming behavioral test. All groups were sacrificed then. The brain tissues were stained with 2% triphenyl tetrazolium chloride(TTC) or 1 % cresyl violet solution, to examine infarct size, volume and cell number. Tumor necrosis $factor-{\alpha}$ level was measured from sera using Enzyme-Linked Immunoabsorbent Assay(ELISA). The mRNA expression level of inflammatory cytokines and related receptor type I and II, $IL-1{\beta}$, IL-6, and IL-10 6hours after MCA occlusion were also studied by reverse transcriptase polymerase chain reaction(RTPCR). Results : The results showed that : Stephania tetrandra (1) reduced infarct size and total infarct volume by 52.2% compared to the control group; (2) attenuated significantly in neuronal death, which was shown by a decrease in cell number(P<0.01) and size(P<0.01) in the boundary area of the infarction; (3) significantly reduced serum $TNF-{\alpha}$ level, and increased the mRNA level of IL-10 in the cortex region(P<0.01). However, there was no significant effect on motor deficit in swimming behavioral test. Conclusions : In conclusion, Stephania tetrandra has protective effects against ischemic brain damage at the early stage of ischemia.

• 대한수의학회지
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• 제33권2호
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• pp.327-336
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• 1993

Present experiments were undertaken in order to clarify the effect of splenectomy on the hematology and marrow megakaryocyte picture and to know the genesis of postsplenectomy thrombocytosis in dogs. Six mongrel dogs weighing 8.5~18㎏ were used, of which three were splenectomized and the other three were laparotomized for comparison. Erythrocyte count, total and differential leukocyte counts, thrombocyte count and packed cell volume measurement were made using the blood samples. In addition, bone marrow samples obtained from the femur at 7th and 23rd day of the operation were examined for the number per low-power field, the diameter, and the distribution frequency of the megakaryocyte. From these experiments, following results were obtained : Erythrocyte count and packed cell volume showed significant decrease beginning on the 15th day of splenectomy. Total and differential leukocyte counts showed marked increase for the first 2 days of postsplenectomy. The thrombocyte count of splenectomized dogs increased from the 2nd day of the operation, reached to the peak count on the 15th day, and returned to the preoperation count by the 28th day. The megakaryocyte count per low-power field of the biopsied preparation increased in according to the increase in thrombocyte count. The megakaryocyte diameter of splenectomized dog showed no increase on the 7th or 23rd day of the operation. However, the distribution frequency of the larger megakaryocyte was higher in the splenectomized dogs than in the laparotomized dogs. The total plasma protein concentration showed no significant change after splenectomy or laparotomy. From these results, it may be concluded that the postsplenectomy thrombocytosis results from the increased megakaryocytopoesis or the activated thrombocytopoesis of the marrow megakaryocytes.

• Journal of Magnetics
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• 제10권1호
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• pp.10-13
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• 2005

We have studied effects of the partial substitution of $La^{3+}$ for $A^{2+}$ on the magnetic properties of double perovskites $A_2FeMoO_6$ (A=Ca, Sr and Ba). Polycrystalline $A_{2-x}La_xFeMoO_6(0{\leq}x{\leq}0.2)$ samples have been prepared by the conventional solid-state reaction in a stream of 5% $H_2$/Ar gas. The x-ray data indicate that A=Ca is monoclinic with the space group P$2_1$/n, A=Sr is tetragonal with the space group I4/mmm, and A=Ba is cubic with the space group Fm3m. The substitution of $La^{3+}$ for $A^{2+}$ results in a cell volume increase for A=Ca and a cell volume reduction for A=Ba. The decrease of saturation magnetization with increasing x arises from the reduction of magnetic moment associated with the electron doping and the disorder at the Fe and Mo sites. The partial substitution of magnetic $La^{3+}$ for $A^{2+}$ considerably enhances the Curie temperature $T_c$ from 316 K for x = 0 to 334 K for x = 0.2. This enhancement of $T_c$ with $La^{3+}$ doping originates from electron doping effects in addition to ionic size ones.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제36권3호
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• pp.177-185
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• 2010

Introduction: Epidermal growth factor receptor (EGFR) is expressed in human epithelial tumors including salivary cancers, and known to be correlated with tumor progression and poor clinical courses in some epithelial tumors. In this study, we determined the therapeutic effect of the anti-EGFR monoclonal antibody Erbitux (C225, cetuximab) in combination with the DNA topoisomerase I inhibitor irinotecan (CPT-11) on human salivary adenoid cystic carcinoma (SACC) cells growing in nude mice. Materials and Methods: At first, immunocytochemical analysis for the expression of EGFR and phosphorylated EGFR (pEGFR) on a human salivary ACC cell line (ACC3). To determine the in vivo effects of Erbitux and CPT-11, nude mice with orthotopic parotid tumors were randomized to receive intraperitoneal Erbitux (1 mg) two times per week, intraperitoneal Irinotecan (50 mg/kg) once per week, Erbitux plus CPT-11, or placebo. (control) Tumor volume and weight were measured. And mechanisms of in vivo activity of Erbitux and/or CPT-11 were determined by immunohistochemical/ immunofluorescent analyses. Results: Immunocytochemical staining of ACC3 demonstrated that EGFR was expressed and phosphorylated. CPT-11 inhibited ACC tumor growth in nude mice. Tumors of mice treated with CPT-11 and CPT-11 plus Erbitux exhibited increased tumor cell apoptosis and decreased microvessel density, which correlated with a decrease in the tumor volume in nude mice. But, CPT-11 seems not to be synergistic with Erbitux in our ACC3 model system. Conclusion: These results suggest that anti-EGFR monoclonal antibody and the DNA topoisomerase I inhibitor will be effective in the treatment of recurred or metastatic lesions of salivary ACC.

• 대한한방부인과학회지
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• 제18권1호
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• pp.15-28
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• 2005

To address the ability of Kung-Kyung-Ilho-Jeon(KK) to induce cell death, we investigated the effect of KK on cell viability. Forty-eight hours later, loss of viability occurred following KK exposure in a dose-dependent manner. The treatment of KK, a commonly used herb formulation in Korea and China, caused a decrease in cell viability. KK also resulted in apoptotic morphology a brightly blue-fluorescent condensed nuclei by Hoechst 33258-staining, and reduction of cell volume. Our results show that KK induces caspase-3 and -9 activation in a time-dependent manner. In addtion, the translocation of cytochrome c release into cytoplasm has been observed under the presence of $5mg/m{\ell}$ KK. The subsequent loss of mitochondria membrane potential is collapsed by the addition of KK. Our immunoblotting data show that PARP, a well known caspase-3 and -6 substrate, is cleaved by KK. We show that a pro-apoptotic protein, Bax is increased in the presence of KK but that the amount of Bcl-2 is not changed. We suggest that Bax, a critical protein which can regulate channel of mitochondria to release cytochrome c, is a key protein in KK-induced apoptosis of Hela human cervical carcinoma cells

• 대한핵의학회지
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• 제5권2호
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• pp.41-56
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• 1971

The pathogenetic mechanisms of anemia in patients with chronic liver disease were observed. Seventeen patients with moderate to advanced hepatic diseass were studied by various methods. Only patients without previous blood loss were included: 14 had cirrhosis, 2 had active chronic hepatitis, and one had inferior vena cava obstruction with associated liver cirrhosis. The followings were the results: 1. The anemia based on red blood cell count, Hb., and Ht. was found in 76.5-78.6% of the patients. 2. Red cell indices indicated that normo-macrocytic and normochromic anemia was present is the majority of the patients. 3. No evidence of megaloblastic anemia was found on the basis of the morphological examinations. 4. Serum iron, TIBC, % saturation and iron content in the bone marrow indicated that iron deficiency anemia was present in about half of the patients. 5. In the view of the erythrocyte dynamics, primary increase in the red cell destruction was ascribed to the cause of the anemia. 6. Decrease in the red cell survival time was not correlated with MCV, % saturation and S.L. ratio. Also, hemoglobin level was not correlated with MCV, % saturation and $T_{50}Cr$. Therefore, multiple causes may be involved in the pathogenesis of the anemia. 7. Anemia as determined by the red cell volume was found in only 60% of the patients. It may be possible that hemodilutional anemia is present.