Objectives To evaluate the neuroprotective effects of modified Yuldahanso-tang (MYH) in a Parkinson's disease mouse model. Methods 1) Four groups (each of 8 rats per group) were used in this study. 2) The neuroprotective effect of MYH was examined in a Parkinson's disease mouse model. C57BL/6 mice treated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP, 30 mg/kg/day), intraperitoneal (i.p.) for 5 days. 3) The brains of 2 mice per group were removed and frozen at $-20^{\circ}C$, and the striatum-substantia nigra part was seperated. The protein volume was measured by Bradford method following Bio-Rad protein analyzing kit. Using mouse/Rat Dopamine ELISA Assay Kit. 4) The brains of 2 mice per group were separated and removed. TH-immunohistochemical was examined in the MPTP-induced Parkinson's disease mice to evaluate the neuroprotective effects of MYH on ST and SNpc. 5) Two mice out of each group were anesthetized and skulls were opened from occipital to frontal direction to take out the brains. The brains added TTC solution for 20 minutes for staining. 6) The water tank used for morris water maze test was filled with $28^{\circ}C$ water, and a round platform of 10cm in diameter was installed for mice to step on. The study was carried out once a day within 30 seconds, keep exercising to step on the platform in the pool. 7) The brains of two mice out of each group were fixed in 10% formaldehyde solution and paraphillin substance was infiltrated. They were fragmented by microtome, and observed under an optical microscope after Hematoxylin & Eosin staining. 8) A round acrylic cylinder with its upper side open was filled with clean water and depressive mouse models were forced to swim for 15 minutes. After 24 hours the animals were put in the same equipment for 5 minutes and were forced to swim. 9) The convenient, simple, and accurate high-performance liquid chromatography (HPLC) method was established for simultaneous determination of Neurotransmitters in MPTP-MYH group. Results 1) MYH possess Dopamine cell protective effect on MPTP-induced injury in striatum and substantia nigra pars compacta. 2) MYH inhibits the loss of tyrosine hydroxylase-immunoreacitive (TH-IR) cells in the striatum and substantia nigra pars compacta on MPTP-induced injury in C57BL/6 mice. 3) MYH possesses improvement effect on MPTP-induced memory deterioration in C57BL/6 mice through the reduction of prolongated Sort of lost time by MPTP injection using the Morris water maze test. 4) MYH possesses hippocampal neuron protective effect on MPTP-induced injury in C57BL/6 mice. 5) MYH possesses improvement effect on MPTP-induced motor behaviour deficits and depression in C57BL/6 mice through the reduction of prolongated losing motion by MPTP injection using the Forced swimming test. 6) MYH increases serotonin product amount on MPTP-induced injury in C57BL/6 mice. Conclusions This experiment suggests that the neuroprotective effect of MYH is mediated by the increase in Dopamin, TH-ir cell, Hippocampus and Serotonin. Furthermore, MYH essential oil may serve as a potential preventive or therapeutic agent regarding Parkinson's disease.
The purpose of this study is to research the effects of desire for independence, possibility of start-up success and employment stability to the push-entrepreneurship through the push-entrepreneurship by a survey of employees in the middle age. The purpose of the creating start-up environment was encouraged the qualitative expansion of opportunity-driven start-up rather than the quantitative expansion of necessity-driven start-up for the economic growth and expanding employment. In spit of the employees had their own careers, skills, opportunities and market-experiences, In reality it is necessity-driven start-up that the quantitative expansion. The purpose of this study was to reflect process change by desire for independence, push-entrepreneurship and pull-entrepreneurship based on the possibility of start-up success and employment stability perceived by individual founders, changed process factor rather than the fixed result factor. The results are as follows. First, it was found that desire for independence makes a positive (+) effect on the pull-entrepreneurship and the push-entrepreneurship. Second, it was found that the possibility of start-up success makes a positive (+) effect on the pull-entrepreneurship and not effect on push-entrepreneurship. third, it was found that the employment stability makes a positive (+) effect on the pull-entrepreneurship and not effect on the push-entrepreneurship. Forth, it was found that desire for independence makes a positive (+) effect on the pull-entrepreneurship and mediating negative (-) effect on the push-entrepreneurship. The implication of this study was that potential entrepreneurs with desire for independence, rather than necessity-driven start-up due to unemployment, could be developed as pull-entrepreneurship improved the situation of push-entrepreneurship. In addition, it seems that entrepreneurship education and activation of entrepreneurship programs for employee with desire for independence expand opportunity-driven start-up after retirement.
Journal of Korean Academy of Oral and Maxillofacial Radiology
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v.22
no.2
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pp.241-252
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1992
The purpose of this study was to investigate the changes of morphology and structure of bone tissue in the irradiated mandibular bone in rats which were fed a low calcium diet. In order to carry out this experimant, 64 seven-week old Sprague-Dawley strain rats weighing about 150gms were selected and equally divided into one experimental group of 32 rats and one control group with the remainder. The experimental group and the control group were then subdivided into two groups when the rats reached ten-week old, 16 were assigned rats for each subdivided group, exposed to irradiation. The two irradiation groups received a single dose of 20 Gy in the jaws area only and irradiated with a cobalt-60 teletherapy unit. The rats in the control and experimental groups were serially terminated by fours on the 3rd, the 7th, the 14th, and the 21st day after irradiation. Following termination, both sides of the dead rats mandibular bodies were removed and fixed with 10% neutral formalin. One side of the mandibular body was radiographed with a soft X-ray apparatus. Thereafter, the obtained microradiographs were observed by a light microscope. The remaining side of the mandibular bone was further decalcified and embedded in paraffin as using the general method. The specimen sectioned and stained with hematoxylin and eosin, and Rabit Anti-Human Tumor Necrosis Factor-a, observed by a light microscope. The obtained results were as follows: 1. Microradiogram revealed that thinning of the cortex and a decrease in the trabecula of the interradicular bone and mandibular body were observed and noted from the start to finish throughout the experiment in the non-irradiated rats on the low calcium diet rather than in the non-irradiated rats on the normal diet. In microscopic observations, there were marked osteolytic changes in the center of the bone marrow. 2. Microradiogram revealed that thinning of the cortex and a decrease in the trabecula of interradicular bone and mandibular body were more marked after 7 days in the irradiated rats on the low calcium diet rather than in the non-irradiated rats on the low clacium diet. In microscopic observations, osteoblasts were decreased markedly after 7 days, and a few osteoclasts were observed. 3. Microradiogram revealed that thinning of the cortex and a decrease in trabecula of interradicular bone and the mandibular body were more marked from the strart to finish troughout the experiment in the irradiated rats on the low calcium diet rather than in the irradiated rats on the normal diet. In microscopic observations, there were no osteolytic changes noted in the irradiated rats on the normal diet. 4. In immunocytochemical findings, a few bone marrow cells including Tumor Necrosis Factor were observed in the irradiated rats on the normal diet, but was not observed in the rats on the low calcium diet.
Journal of Korean Academy of Oral and Maxillofacial Radiology
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v.22
no.2
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pp.223-234
/
1992
The purpose of this study was to investigate the changes of periodontal tissues in the irradiated mandibular bone in rats which were fed normal diet and low calcium diet In order to carry out this experiment, 64 seven-week old Sprague-Dawley strain rats weighing about 150gms were selected and equally divided into one experimental group of 32 rats and one control group with the remainder. The experimental group and the control group were then subdivided into two groups when the rats reached the age of 10 weeks, 16 rats were allotted for each subdivided group was composed of 16 rats and exposed to irradiation. The two groups were irradiated a single dose of 20Gy on the only jaw area and irradiated with a cobalt-60 teletherapy unit The rats in the control and experimental groups were serially dissected by fours on the 3rd, the 7th, the 14th, and the 21st day after irradiation. After each dissection, both sides of the dead rat mandibular bodies were removed and fixed with 10% neutral formalin. The specimens sectioned and observed in histopathological. histochemical. and immunocellular chemical methods. The obtained results were as follows: 1. In the mandibles of rats with low calcium diet the increased number of fibroblasts of periodontal ligaments. many small capillaries and irregular arrangement of loose collagen fibers were detected and the partial resorption of dentin and cementum could be found by the microscopic studies. 2. In the group of irradiated rats, degenerated periodontal tissues led to the condition of irregular arrangement of collagen fibers and the decreased number of fibroblasts. But this condition was somewhat restored after 21 days of experiment. 3. Periodontal tissues of the irradiated rat group with low calcium diet were destroyed earlier than those of the irradiated rat group with normal diet. Soon this condition was restored and then high cellularity and dense collagen fibers were observed. 4. Many periodontal cells bearing tumor necrosis factor could be clearly observed in the nonirradiated group of rats with normal diet, whereas could not be observed on the 7th day and reappeared on 14th day in the irradiated group of rats with normal diet. A few of them could be observed in the group of rats with low calcium diet, but they could be clearly observed in the both groups after 21 days of experiment.
Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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2004.05a
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pp.408-413
/
2004
High speed planning boats also have been required more and more the rational strength analysis and evaluation for the optimal structural design in respect of the structural lightness according to the high speed trend. Even though the suggestion of the simple type equation for the equivalent dynamic pressure is reasonable to design the scantling of ship structure conveniently, many research activities for more reasonable improvement of the simple design pressure, have been continued to suggest the more accurate equivalent static description of tire structural response such as the deflection and stress of hull structure. In this research, we focus on the aluminum bottom stiffened plate structure in which structural scantling is mainly depend on the local loads such as dynamic or impact pressure without other load effects and structural response for the simple dynamic equivalent pressure was investigated through the structural analysis. In order to investigate the structural response of the bottom stiffened plate structure subjected to the dynamic equivalent design pressure, linear and nonlinear structural analysis of the bottom stiffened plate structure of 4.3 ton aluminum planning boat was performed based on the equivalent static applied loads which were derived from the KR regulation and representative one among various dynamic equivalent pressure equations. From above analysis results, we found that the response such as deflection and stress of plate member was similar with the response results of one plate member model with fixed boundary, which was published previous paper and in case of KR design loading, all response of stiffened plate structure were within elastic limit. Through the nonlinear analysis, nearly elastic behavior including the slight geometrical nonlinear response was dominant but plastic local zone was appeared at $85\%$ limit load. Therefore, we can say that through tire linear and nonlinear analysis, this stiffened plate member has no structural strength problem based on the yield criteria in case within $60\%$ limit load except the other strength point of view such as the fatigue and buckling problem.
Excessive blood loss secondary to cardiopulmonary bypass(CPB) may be encountered after open heart surgery and platelet dysfunction appears to be especially responsible for this problem. To evaluate the effect of low-dose aprotinin during hypothermic CPB on platelet aggregation, anticoagulation and clinical hemostasis,.40 patients undergoing valve replacement using hypothermic CPB procedures were randomized to give either a low dose aprotinin(2$\times$ 106 KIU in the CPB priming sol- ution, n=20) or a placebo(n=20). During postoperative 24 hours, blood and hemoglobin loss were lower in the aprotinin group (225.5 $\pm$ 121.9ml, and 11.3$\pm$2.4g) than the control group(572.2$\pm$)35.5ml and 26.3$\pm$9.8g)(P<0.01). The total blood and hemoglobin loss were lower in the aprotinin group (622.0$\pm$ 186m1 and 14.7$\pm$6.8g) than the con- trol group (102.1 $\pm$483.5ml and 39.7$\pm$ 16.4g) (P<0.01). The amonut of packed red cell needed decreased in the aprotinin group: 197.7$\pm$56.3ml vers s 651.2: 147.5ml (P<0.01). Hemoglobin concentration, platelet counts and fibrinogen checked at fixed times perioperatively did not differ between the two groups. Platelet aggregation was induced by ADP, collagen, epinephrine and ristocetin before and after CPB. Maximum platelet aggregation was significantly reduced after CPB in control group (ranging from -31 % to -58% relative to prebypass values). Significant prolongation of activated clotting time(ACT) after 5 minute and 30 minute of hypothermic CPB were observed: 955.9 $\pm$35.1 and 967.5$\pm$32.7sec versus 743.8 $\pm$ 52.1 and 731.2: 54.6sec (P<0.01). There was no complication associated with aprotinin infusion. These results demonstrate that low-dose aprotinin significantly reduces blood loss and blood requirment and provides improved postoperative hemostasis which might be related to protection of platelet aggregation capacity.
Kim, Hong-Tae;Jeong, Eui-Sook;Chung, Duck-Soo;Kim, Ki-Hong;Kim, Jong-Ki
Korean Journal of Fisheries and Aquatic Sciences
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v.42
no.2
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pp.131-138
/
2009
The radioprotect effects of fractinated fucoidan, derived from Undaria pinnatifida sporophylls, were examined in lung injured rats treated with partial body irradiation. The right lung of Sprague-Dawley rats, eight separately grouped by including radiation only control group (ROG) and fucoidan+radiation treated group (FRG), were treated with various fraction of Undaria-derived fucoidan every other day by intraperitoneal injection 6 days prior to irradiation and during monitoring at 24 hours, 48 hours, 2 weeks, 4 weeks and 12-weeks post-irradiation of 6 Mev/2 Gy. The rats were euthanized at completion of the treatment. Tissue samples from the injured lung, fixed in formaldehyde using lung perfusion prior to extraction, were H/E stained for histological analysis using optical microscopy. Interstitial congestion (IC), hemorrhage in alveolar sac (HM), number of macrophage (MP) and alveolar wall thickness (AWT) as a measure of early indication of fibrosis were measured. AWTs in 24 hrs post-irradiation rats increased in comparison with $2.49{\pm}0.06{\mu}m$ of control group by $3.67{\pm}0.09{\mu}m$, $3.21{\pm}0.08{\mu}m$ (p=0.013), $2.98{\pm}0.08{\mu}m$ (p=0.00) in ROG, F1-fucoidan+radiation, and F3-fucoidan+radiation group, respectively. AWT of the ROG was further increased by $4.30{\pm}0.13{\mu}m$ in the 12 weeks post-irradiation group, but AWT on average was $2.56{\pm}0.05{\mu}m$ in the FRG. MP in the 24 hrs post-irradiation group markedly increased in comparison with $2.6{\pm}0.34/0.14\;mm^2$ of the control group by $8.0{\pm}1.48/0.14\;mm^2$ in the ROG, but it was only $3.6{\pm}0.48/0.14\;mm^2$ in F3-FRG. MP in the 12 weeks post-irradiation group was $7.2{\pm}1.28/0.14\;mm^2$ in ROG, but it was $2.8{\pm}0.37/0.14\;mm^2$ or $2.4{\pm}0.4/0.14\;mm^2$ (p<0.05) in the FRG. In addition, increased IC and HM in ROG were relatively smaller in FRG of the 24 hr and 12 weeks post-irradiation rats. In conclusion, Undaria pinnatifida sporophylls-derived fucoidan fractions exhibited radioprotectant activity on injured rat lung subjected to X-ray irradiation. However, success was variable according to the fractions and also time of injection post injury.
This study analyzed the ignorance and prejudice with regard to African culture, which can be seen at the textbook and class course centering the geography class from 1990's to the present, and reviewed critically the related education and learning effects for mutual understanding. This study results are as follows: First, in the geographic environment contents, the image regarding huge continent, the local image regarding the various physical environments and the geographical importance as the ancient civilization birthplace were not included in the description. Second, the description regarding the African culture and history was focused to the singular African image, so the fixed concept and distorted image has been rooted into the formation of cultural meta-knowledge. Third, the negative sides rather than positive development and the past backward facts rather than changed status have been emphasized in the description regarding African resources and industry as well, so only the region surrounded with the various problems including poverty and the image as underdeveloped country have been rooted into the description. Now, real Africa view, an image for a variety of attractive and vibrant Africa rather than the same culture and characteristics of African must be learned in text books.
Journal of Korean Society of Environmental Engineers
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v.22
no.2
/
pp.291-302
/
2000
This experiments have been made to develop of manganese-based sorbent for the removal of hydrogen sulfide from hot coal gases. Manganese-based sorbent were tested in an ambient-pressure fixed-bed reactor to determine steady state $H_2S$ concentrations, breakthrough times and feasibility of the sorbent when subjected to cycle sulfidation and regeneration testing. Effects of particle size of sorbent, temperature of sulfidation, regeneration temperature and regeneration characteristics on the $H_2S$ removal efficiency were investigated. Experimental results showed that the $H_2S$ removal efficiency was optimal when the temperature was about $800^{\circ}C$ and the smaller particle size, the better $H_2S$ removal efficiency but in the range of 0.214~0.631mm didn't influence it much. The equilibrium constant(K) is represented as a log(K)=3.396/T-1.1105 and the utilization efficiency of sorbents was about 92% at $800^{\circ}C$. Regeneration in air produced $SO_2$ concentration as high as 8.5% at $800^{\circ}C$, 8.4% at $850^{\circ}C$, and 8.8% at $900^{\circ}C$ and may be used in sulfuric acid production.
Asia-Pacific Journal of Business Venturing and Entrepreneurship
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v.9
no.4
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pp.13-25
/
2014
This study advances research on new venture by taking the organizational ecology perspective to explore the relationship between social legitimacy and new venture performance. We examine how entrepreneurs' organizing activity and social norm shape the social legitimacy. This paper also categorizes the social norms into three parts: social norm that is 1) supporting success achieved through one's own effort 2) encouraging start-up, and 3) promoting risk-taking. Using a dataset of PSED(Panel Study of Entrepreneurial Dynamics) from 2005 to 2011, we found that entrepreneurs' organizing activity has a positive effect on new venture performance. In addition, this study presents the moderating effects of 'liability of newness' that decreases the effect of organizing activity on new venture performance. Interestingly, with respect to the social norm, 'liability of newness' only moderates the relationship between start-up encouraging social norm and new venture performance.
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