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Munki Kim, Chong-Sup Kim, Gon-Sup Kim, Chung-Kil Won 충북대학교 동물의학연구소 2014 Journal of Biomedical and Translational Research Vol.15 No.3
The morphology of the lingual papillae in a female Bengal tiger (Panthera tigris tigris) was examined by scanning electron microscopy (SEM). The tongue was 22.3 cm in length and 7.1 cm in width. Numerous filiform papillae were distributed over the entire dorsal surface of the tongue. SEM examination of the tongue revealed two types of mechanical papillae, i.e. filiform and conical papilla, and two types of gustatory papillae, i.e. fungiform and vallate papilla, on the dorsal surface of the tongue. Each filiform papilla consisted of one primary papilla and several secondary papillae. The filiform papillae on the anterior part of the tongue were divided into one primary and 6~14 secondary papillae. Unlike other mammalians, however, secondary papillae in the mid-part of the tongue showed pineal-like papillae. In the posterior part of the tongue, secondary papillae were rare or absent. Fungiform papillae were surrounded by filiform papillae and densely distributed on the lingual surface. There were two vallate papillae on the borderline between the lingual body and root of the tongue. A vallate papilla contained two secondary papillae inside the grooves. Conical papillae were located in the area of the vallate papillae and covered the posterior part of the tongue root. No foliate papillae were seen on both margins of the posterior part of the tongue. Our results indicate that the structure on the lingual papillae of the Bengal tiger is somewhat different from that of other mammals.
액체로켓엔진 가스발생기 개발에서의 연소불안정 경험 사례
김문기(Munki Kim),임병직(Byoungjik Lim),김성구(Seong-Ku Kim),김종규(Jong-Gyu Kim),최환석(Hwan-Seok Choi) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
한국형발사체에 적용되는 액체로켓엔진은 가스발생기 개방형 엔진 사이클을 채택한다. 가스발생기에서 연소 불안정이 발생하면 연소 성능이 변하고 진동, 소음 등의 문제점을 야기하거나 하드웨어의 손상을 초래할 수 있다. 본 연구에서는 액체로켓엔진의 가스발생기를 개발하면서 나타난 연소불안정 경험 사례를 소개하고자 한다. The gas-generator open cycle is adapted for liquid rocket engine of Korea Space Launch Vehicle-II. The combustion instability can interfere with combustion performance and cause a noise and vibration or carry the potential for serious damage. This study introduces the experience cases of combustion instability in development of the gas generator for liquid rocket engine.
A light microscopic study on tongue development in Korean native goats (Capra hircus)
Chungkil Won, Munki Kim. Gyu-Hyen Cho, Chong-Sup Kim, Gon-Sup Kim 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.4
The purpose of this study was to identify the composition and organization of lingual tissues underlying the histo-structural change of developing tongue in Korean native goats by light microscopy (LM). Tongues of the fetuses on days 60, 90, 120 and neonate were examined for the morphological development. In the 60-day-old fetuses, the tongue tissues were differentiated into epithelium, lamina propria and muscle layer. Primordia of filiform, conical, lentiform, fungiform and vallate papillae appeared and rudiments of taste bud were observed in the epithelia of the primordia of the gustatory papillae. The dorsal surface of the lingual epithelia showed a weak PAS positive reaction. Collagenous fibers and small blood vessels were shown in the connective tissues. In the 90-day-old fetuses, Von Ebner’s glands were moderately PAS positive while the muscle fibers and connective tissue were strongly positive for PAS. The collagenous fibers increased and came to have a more complex arrangement in the tongue. The muscle fibers were spread out at various directions and developed in striated muscle bundles. In the 120-day-old fetuses, taste buds were observed in the epithelia of the gustatory papillae, and several well-developed tissues visible such as blood vessels, collagenous fibers, muscle fiber bundles and Von Ebner’s glands. In the neonates, many taste buds were found in a transverse section of the vallate papilla. The muscle layers, Von Ebner’s glands, collagenous fibers and blood vessels were more developed than those of the 120-day old fetuses. These findings indicate that goat tongues have a variety of different shapes during prenatal development
Chungkil Won, Gyuhyen Cho, Munki Kim, Gon-Sup Kim, Chongsup Kim 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.4
The aim of this study was to investigate the morphological development pattern of conical papilla (CP) during prenatal and postnatal periods in native Korean goats by scanning electron microscopy. Tongues were removed from fetuses on days 90, 120, and neonates and from juveniles on days 30, 50, 60, 75, 90, 120, 150, and 180 after birth. The lengths of CP were 194~240 μm in neonates, 335~485 μm in the weaning period of 60-day-old goats, and 526~662 μm in the maturing period of 180-day-old goats. The primordia of CP in 90-day-old fetuses, shaped like mountain berry, were sprouted. The CP of 120-day-old fetuses was a cylinder shape with an apex whose center was slightly concave and the margin was sticking up like a low fence. The CP of neonates was empty inside and the secondary papillae were irregularly arranged fence-like structures on it. In 60-day-old goats, CP was an obliquely sectioned cylinder shape compacted in inner surface; the shapes of CP varied in 120-day-old goats, and had a smooth surface. A low elevation of CP was observed in 150- and 180-day-old goats. The microridges, microplicae, and micropits were well developed on the epithelial surface of lingual papillae in 60- to 120-day-old goats. These findings indicate that CP of goats has a variety of sizes and shapes during development.
Gyu-Hyen Cho, Munki Kim, Chong-Sup Kim, Gon-Sup Kim, Chung-Kil Won 충북대학교 동물의학연구소 2014 Journal of Biomedical and Translational Research Vol.15 No.3
Cytokeratin (CK) comprises the intermediate filament cytoskeleton of epithelial cells. Patterns of CK expression can be regarded as a specific marker for epithelial differentiation status. The aim of this study was to identify CK expression on tongues of Korean native goats ranging from 60-day-old fetuses to newborns during prenatal development using immunohistochemistry. The tongues of fetuses were removed from 2- to 4-year-old female Korean native goats by caesarean section performed under general anesthesia. Immunohistochemistry was performed to assess CK expression patterns on developing goat tongues using serial paraffin-embedded sections. Light zones signifying CK immunoreactivity in dorsal lingual epithelia were weakly positive in 60-day-old fetuses. In 90-day-old fetuses, deep areas in dorsal lingual epithelia were strongly positive for CK expression and superficial areas were moderately positive. In 120-day-old fetuses, light zones of lingual epithelia in the vallate papilla were strongly positive for CK expression, whereas ducts of von Ebner’s glands were moderately positive. In neonates, taste buds were positive for CK expression, whereas non-taste epithelial cells and von Ebner’s glands were negative. These findings indicate that goat tongues have different patterns of CK expression during development and provide a morphological basis for studies on the biological mechanism of epithelial differentiation.
Chungkil Won, Gyuhyen Cho, Munki Kim, Gonsup Kim, Chongsup Kim 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.3
The purpose of this study was to explore the morphological characteristics of developing lentiform papilla (LP) in Korean native goats by scanning electron microscopy (SAM). Tongues were removed from fetuses on days 90, 120, neonates, and juveniles on days 30, 60, 90, 120, 150, and 180. In prenatal development, the primordia of LP in 90-day-old fetuses were round and spotted on the inner most part of the torus linguae of the tongue. Primordia of LP in 120-day-old fetuses also had a lens-like shape. In neonates, LP displayed similar features as the adult one. In postnatal juveniles on days 30 and 60, LP continually increased in size without much difference in structure compared to that of neonates. By postnatal day 90, detached pieces of keratinized superficial epithelia were observed. Microridges and microplicae were well developed on the epithelial surface of LP in 60- to 120-day-old goats. The lengths of LP were 476~514 μm in neonates, 687~962 μm in the weaning period of 60-dayold goats, and 1,068~1,567 μm in the maturing period of 180-day-old goats. These findings indicate that goat LP has different sizes and shapes from those of other species during development
Dopamine D3 receptor-modulated neuroprotective effects of lisuride
Kim, Munki,Lee, Sijoon,Cho, Jeahyeon,Kim, Gonsup,Won, Chungkil Elsevier 2017 NEUROPHARMACOLOGY - Vol.117 No.-
<P><B>Abstract</B></P> <P>Dopamine (DA) contributes to the regulation of voluntary movement, and a deficiency in DAergic neurons leads to movement disorders. The objective of this study was to examine the neuroprotective effect of DA D2-like receptor agonist, lisuride, and the role of DA receptors in this protection. Treatment with lisuride alleviated loss of tyrosine hydroxylase (TH) both direct and intraperitoneal injection in 6-hydroxydopamine (6-OHDA) mouse model. Similar results were obtained in primary neuronal cultures treated with lisuride. Lisuride protected TH expression against 6-OHDA-induced cytotoxicity in a concentration-dependent manner. Then, we evaluated the role of DA D2 and D3 receptor in neuroprotective effect of lisuride. Treatment of neuronal cultures with L-741,626, a DA D2 receptor-selective antagonist, did not alter neuroprotective effect of lisuride. However, protective effect of lisuride on TH expression was abolished when cells were treated with GR103691, a D3 receptor selective antagonist. Furthermore, whether lisuride can alleviate mitochondrial damage of DAergic neurons induced by 6-OHDA, we investigated the expression of the mitochondrial regulatory protein, paraplegin, and changes in mitochondria morphology. Treatment with lisuride countered a 6-OHDA-induced reduction in paraplegin and TH expression, and co-treatment with GR103691 blocked this effect of lisuride. Transmission electron microscopy confirmed the lisuride mitigation of 6-OHDA-induced damage to the mitochondrial membrane and cristae. These results suggest that the DA D3 receptor mediates the neuroprotective effects of lisuride by preventing mitochondrial damage.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The dopamine D2-like receptor agonist lisuride has neuroprotective effects. </LI> <LI> Lisuride injected into the mouse substantia nigra countered 6-OHDA neurotoxicity. </LI> <LI> Lisuride prevented 6-OHDA-induced damage in neuronal mitochondria. </LI> <LI> Lisuride's neuroprotective actions were blocked by a D3 receptor antagonist. </LI> <LI> The D3 receptor mediates lisuride-induced neuroprotection in dopaminergic neurons. </LI> </UL> </P>
김문기(Munki Kim),임병직(Byoungjik Lim),강동혁(Donghyuk Kang),안규복(Kyubok Ahn),김종규(Jong-Gyu Kim),최환석(Hwan-Seok Choi) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
가스발생기에서 배출되는 연료 과농의 미연가스를 안전하게 처리하기 위하여 후연소 장치를 개발하였다. 축소형 가스발생기에 대한 연소시험을 통해 후연소 장치의 작동성 및 안전성에 대한 검증을 수행하였다. 추가적인 액체산소를 공급함에 따라 후연소 화염의 길이가 급격하게 줄어드는 것을 확인하였다. An afterburning device was developed to safely treat unburnt gases of fuel-rich condition discharged by a gas generator. Hot-firing tests for a subscale gas generator were carried out to investigate operation and safety of the afterburning device. When supplying additional liquid oxygen, the length of the afterburning flame was significantly reduced.