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생체분해성 고분자를 이용한 사시수술용 제형개발 및 효용성에 대한 연구
민병무,김용백,김승영,김창식,박근성,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
A new device, muscle clamping system was developed to facilitate exact quatifying technique A strabismus surgery, and reduce the risk of complications. The device is composed of a lower fixing body with three jaws and an upper supporting body. They are used to clip an extraocular muscle and fix it to the sclera with a single bite. Superior rectus recession on 16 rabbit eyes were performed with this new device. Conjunctival injection, muscle adhesion strength, and light microscopic findings were examined at 1, 2, 4 and 8 weeks postoperatively. The Conjunctival injection were minimal, adhesion power ranged from 420 to 600 gram gravity, which is sufficient in withstand the normal pull of human extraocular muscle. In microscopic exam, some Inflammatory cells and fibrosis were found. The new device was technically easy, fast, and accurate, so it may be useful in stabismus surgery.
민병무,김용백,박근성,송규상,양준묵,이성복,조항진,길숙종,김승영,김학용 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
An improved retinal tack can be used to fix the retina in complicated retinal detachment and proliferative vitreoretinopathy. We used the retinal tack made by biodegradable polyglycolic acid, polylactic acid and copolymers. The tacks with polyglycolic acid were placed in the retina the right eyes of 10 rabbits as group 1, with polylactic-polyglycolic acid copolymers as group 2 in each left eyes. We examined the absorption rates and degree of intraocular inflammation at 1 day, 1, 2, 4, and 8 weeks and compared both eyes. The tacks were absorbed with time in both eyes, but more rapid in copolymers. And there was no inflammation in both eyes. Now, this study will be a base on the drug delivery system in intraocular pharmacological and surgical management.
생체분해성 망막압정을 이용한 망막고정에 대한 실험적 연구
김용백,민병무,김창식,박근성,김승영,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1
Biodegradable retinal fixation devices obtain mechnical fixation of the retina with desirable chorioretinal scarring and with the potential for local, sustained release of antimetabolites and steroids to inhibit proliferative vitreoretinopathy. We manufactured a biodegradable retinal tack with barb that was designed in order to prevent intrusion from implantation of retinal tacks. This study was carried to evaluate the efficacy for retinal fixation and the capability for sustained release of drugs with a newly designed biodegradable retinal tack Biodegradable retinal tacks were made of polymers of glycolic acids and were designed with barbs in a shape to prevent the disinsertion. Biodegradale retinal tacks are divided into 3 parts, a conical portion that is inserted into the sclera, a cylinder portion that remains in the vitreous, and a neck portion between the pin and the cylinder. The tapered conical end was manufactured to allow easy insertion through the retina and choroid into the sclera. A cylinder portion was manufactured with a tapered angle that fixes firmly into the orifice of 19 gauge spinal needle. A neck portion, 0.4 mm in diameter, was designed to prevent disinsertion from following implantation of retinal tack. The applicator was a 19 gauge spinal needle and its orifice was prepared to 15°angle to accept the tapered cylinder portion of the retinal tack. The retinal tacks, secured in the needles, were passed through the formed vitreous and inserted into the retina, choroid, and sclera and were released by pushing the internal needle, usually within 2-3mm of the medullary ray of the posterior rabbit retina A retinal tack was placed in each of 8 pigmented rabbit eyes. Slit-lamp biomicroscopy, indirect ophthalmoscopy and fundus photography were performed periodically from 1 day to 8 weeks after surgery. Eight eyes were enucleated and studied by light microscopy at 8 weeks. Biomicroscopic evaluation of the animals revealed edemas adjacent to the retinal surfaces immediately after insertion of the biodegradable retinal tacks in all the animals. These edemas disappeared after 1 week. The first noticeable change in the size of retinal tacks was shown after 2weeks. The size of the retinal tacks gradually got smaller, decreasing to about one-half at 4 weeks and about one-third at 8 weeks. All retinal tacks remained in inserted places without any movement for an 8 week period. On light microscopy, epiretinal proliferations were seen to extend into the vitreous cavity. Cellular capsules that lined the inner aspect of the scleral defect caused by tack insertion were found. However the adjacent retina had a normal cytologic appearance and architecture in all specimens. We manufactured a biodegradable retinal tack that is designed to prevent intrusion from implantation of retinal tacks. All biodegradable retinal tacks reduce in size with time, but no retinal tacks extruded from the inserted place. The newly designed biodegradable retinal tack can be used for retinal fixation and may be used as a vehicle for the introduction of pharmacologic agents to prevent the cellular events that promote proliferative vitreoretinopathy.
Cadmium Inhibition of Renal Endosomal Acidification
Moo Seong Kim,Kyoung Ryong Kim,Do Whan Ahn,Yang Saeng Park 대한생리학회-대한약리학회 2000 The Korean Journal of Physiology & Pharmacology Vol.4 No.1
<P> Chronic exposure to cadmium (Cd) results in an inhibition of protein endocytosis in the renal proximal tubule, leading to proteinuria. In order to gain insight into the mechanism by which Cd impairs the protein endocytosis, we investigated the effect of Cd on the acidification of renal cortical endocytotic vesicles (endosomes). The endosomal acidification was assessed by measuring the pH gradient-dependent fluorescence change, using acridine orange or FITC-dextran as a probe. In renal endosomes isolated from Cd-intoxicated rats, the V<SUB>max</SUB> of ATP-driven fluorescence quenching (H<SUP></SUP>-ATPase dependent intravesicular acidification) was significantly attenuated with no substantial changes in the apparent K<SUB>m</SUB>, indicating that the capacity of acidification was reduced. When endosomes from normal animals were directly exposed to free Cd <I>in vitro</I>, the V<SUB>max </SUB>was slightly reduced, whereas the K<SUB>m</SUB> was markedly increased, implying that the biochemical property of the H<SUP></SUP>-ATPase was altered by Cd. In endosomes exposed to free Cd <I>in vitro</I>, the rate of dissipation of the transmembrane pH gradient after H<SUP></SUP>-ATPase inhibition appeared to be significantly faster compared to that in normal endosomes, indicating that the H<SUP></SUP>-conductance of the membrane was increased by Cd. These results suggest that in long-term Cd-exposed animals, free Cd ions liberated in the proximal tubular cytoplasm by lysosomal degradation of cadmium-metallothionein complex (CdMT) may impair endosomal acidification 1) by reducing the H<SUP></SUP>-ATPase density in the endosomal membrane, 2) by suppressing the intrinsic H<SUP></SUP>-ATPase activity, and 3) possibly by increasing the membrane conductance to H<SUP></SUP> ion. Such effects of Cd could be responsible for the alterations of proximal tubular endocytotic activities, protein reabsorption and various transporter distributions observed in Cd-exposed cells and animals.
Radiofrequency Ablation and Excision of Multiple Cutaneous Lesions in Neurofibromatosis Type 1
Kim, Seong-Hun,Roh, Si-Gyun,Lee, Nae-Ho,Yang, Kyung-Moo Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.1
Background Von Recklinghausen disease or neurofibromatosis type 1 is an autosomal dominant genetic disorder of chromosome 17q11.2. The most common characteristic findings of NF 1 include multiple and recurrent cutaneous neurofibromas associated with psychosocial distress. Methods Sixteen patients (9 female, 7 male; average age, 31 years; range, 16 to 67 years) with multiple cutaneous neurofibromas between March 2010 and February 2012 were included in the study. All patients were treated with radiosurgical ablation and excision under general anesthesia. Results All 16 patients were satisfied with the results, when questioned directly during the outpatient department follow-up. The only complaint from a few patients was minimal scarring, but acceptable results were obtained in the end. Conclusions The radiofrequency procedure is almost bloodless and quick, creating a smaller necrotizing zone. Therefore, instead of employing the time consuming traditional surgery, such as laser therapy and electrosurgical excision, that produces uncertain results and can affect normal adjacent tissue, treatment of neurofibromas with radiofrequency ablation and excision can be an alternative choice of treatment for patients with a large number of neurofibromas.
Mg-3%Al-1%Zn 합금의 가공열처리에 따른 미세조직 및 기계적 성질 변화
윤성식 ( Seong Sik Yoon ),조무현 ( Moo Hyon Cho ),조우석 ( Woo Suk Jo ),강조원 ( Jo Won Kang ),장우양 ( Woo Yang Jang ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
The effect of thermomechanical treatment conditions on the microstructure, recrystallization behavior and tensile properties in a Mg-3%Al-1%Zn alloy has been studied. Recrystallization temperature of the sheet hot-rolled is risen with increasing hot-rolling temperature due to lack of lattice defects such as deformation twins and dislocations. Comparing tensile strain of the sheets which is hot-rolled a different temperature with annealing temperature, the largest elongation is obtained in the sheet hot-rolled at 230℃ and then annealed at 200℃ and/or the sheet hot-rolled at 180℃ and then annealed at 300℃. With increasing annealing temperature of the hot-rolled sheet, the size of dimples on the fracture surface is decreased and is uniformed throughout fracture surface, but fracture mode is changed to intergranular fracture by annealing above 400℃.
100 kg/day 액화수소 제조시설용 Ortho-Para 변환기의 설계 및 성능평가
양성민(Seong Min Yang),박주형(Joo Hyoung Park),이병무(Byeong Moo Lee),김서영(Seo Yong Kim),홍동희(Dong Hui Hong) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This Ortho-Para hydrogen converter was designed for application to actual hydrogen liquefaction facility. The conversion device converts Ortho hydrogen into Para hydrogen after heat exchange of between hydrogen and liquefied nitrogen in a pre-cooler before liquefaction. The performance of this converter was evaluated by the enthalpy change between the inlet line and the out line. The converter is filled with 600 cc by selecting iron oxide(Fe₂O₃) as a catalyst. The conversion rates were compared for each flow range[0.1 to 0.6 m3/min (H₂ @ 293 K, 1 atm)]. Overall, as the flow rate of hydrogen increased, the conversion rate decreased. However, as the flow rate increased, a slight temperature decrease of hydrogen occurred, and there were a section in which the conversion rate increased due to an increase in the equilibrium point of ratio of Para.