A new species of Acanthamoeba was isolated from a freshwater fish in Korea and tentatively named Acanthamoeba sp. YM-4 (Korean isolate YM-4). The trophozoites were 11.0-23.0 micrometer in length and had hyaline filamentous projections. Cysts were similar to those of A. culbertsoni and A. royreba, which were previously designated as Acanthamoeba group III. Acanthamoeba YM-4 can survive at 40 degrees C, and its generation time was 19.6 hr, which was longer than that of A. culbertsoni. In terms of the in vitro cytotoxicity of lysates, Acanthamoeba YM-4 was weaker than A. culbertsoni, but stronger than A. polyphaga. On the basis of the mortality of experimentally infected mice, Acanthamoeba YM-4 was found to be highly virulent. The isoenzymes profile of Acanthamoeba YM-4 was similar to that of A. royreba. An anti-Acanthamoeba YM-4 monoclonal antibody, McAY7, was found to react only with Acanthamoeba YM-4, and not with A. culbertsoni. Random amplified polymorphic DNA marker analysis and RFLP analysis of mitochondrial DNA and of 18S small subunit ribosomal RNA, placed Acanthamoeba YM-4 in a separate cluster on the basis of phylogenetic distances. Thus the Acanthamoeba Korean isolate YM-4 was identified as a new species, and assigned as Acanthamoeba sohi.
Acanthamoeba/*classification/genetics/isolation & purification/*pathogenicity ; Amebiasis/parasitology/*veterinary ; Animals ; DNA, Mitochondrial/analysis ; DNA, Protozoan/analysis ; Fish Diseases/*parasitology ; Gills/parasitology ; Goldfish/*parasitology ; Korea ; Mice ; Phylogeny ; Polymorphism, Restriction Fragment Length ; RNA, Ribosomal, 18S/genetics ; Random Amplified Polymorphic DNA Technique ; Virulence

Acanthamoeba and Naegleria are widely distributed in fresh water, soil and dust throughout the world, and cause meningoencephalitis or keratoconjunctivitis in humans and other mammals. Korean isolates, namely, Naegleria sp. YM-1 and Acanthamoeba sp. YM-2, YM-3, YM-4, YM-5, YM-6 and YM-7, were collected from sewage, water puddles, a storage reservoir, the gills of a fresh water fish, and by corneal washing. These isolates were categorized into three groups based on the mortalities of infected mice namely, highly virulent (YM-4), moderately virulent (YM-2, YM-5 and YM-7) and nonpathogenic (YM-3). In addition, a new species of Acanthamoeba was isolated from a freshwater fish in Korea and tentatively named Korean isolate YM-4. The morphologic characters of its cysts were similar to those of A. culbertsoni and A. royreba, which were previously designated as Acanthamoeba group III. Based on experimentally infected mouse mortality, Acanthamoeba YM-4 was highly virulent. The isoenzymes profile of Acanthamoeba YM-4 was similar to that of A. royreba. Moreover, an anti-Acanthamoeba YM-4 monoclonal antibody reacted only with Acanthamoeba YM-4, and not with A. culbertsoni. Random amplified polymorphic DNA marker analysis and RFLP analysis of mitochondrial DNA and of a 18S small subunit ribosomal RNA, placed Acanthamoeba YM-4 in a separate cluster based on phylogenic distances. Thus Acanthamoeba YM-4 was identified as a new species, and assigned Acanthamoeba sohi. Up to the year 2002 in Korea, two clinical cases were found to be infected with Acanthamoeba spp. These patients died of meningoencephalitis. In addition, one case of Acanthamoeba pneumonia with an immunodeficient status was reported and Acanthamoeba was detected in several cases of chronic relapsing corneal ulcer, chronic conjunctivitis, and keratitis.
*Acanthamoeba/classification/genetics/immunology/pathogenicity ; Amebiasis/diagnosis/epidemiology/*parasitology/therapy ; Animals ; Antigens, Protozoan/analysis/genetics/immunology ; DNA, Mitochondrial/analysis ; DNA, Protozoan/analysis ; Korea/epidemiology ; Life Cycle Stages ; *Naegleria/classification/genetics/immunology/pathogenicity ; Phylogeny ; Polymorphism, Restriction Fragment Length ; Random Amplified Polymorphic DNA Technique/veterinary ; Virulence/genetics

Sunlight is one of the well-established factors which play key roles in the induction and exacerbation of lupus erythematosus. In two patients of discoid lupus erythematosus, we have experimentally reproduced skin lesions by provocative phototesting. Both UVA (100 joules/cm²) and UVB (80 millijoules/cm²) radiation induced the skin lesions. The reproduced skin lesions were clinically and histopathologically consistent with lupus erythematosus.
Humans ; Lupus Erythematosus, Discoid ; Reproduction* ; Skin ; Sunlight

Mandibular retrusion showing the facial problem with a marked maxillarry incisors protrusion and chin deficiency, resulting in a highly convex profile is uncommon in Korea.. The large incisor overjet and deep-bite create functional limitations and unpleasing esthetic result. The majority of theses cases are susceptible to correction by orthodontic therapeutic methods. But severe Class II retrognathic cases in which orthodontic treatment alone has not been capable of achieving good results. Orthognathic surgery offers several approaches. In this case, mandibular advancement by bilateral sagittal split ramus osteotomy and augmentation genioplasty has a special surgical problems. The suprahyoid muscle gorup are lengthened if the body of the mandible is surgically repositioned anteriorly. Instability of results and relapse return to original position shoud predicted during post-surgical muscular readjustment.. To maintain maximum correction with this technique, it is suggested that the mandibular body be well rotated forward at time of surgical intervention and overcorrected anteriory as much as possible. So, the authors report the case with review of concerned literature.
Chin ; Genioplasty ; Incisor ; Korea ; Mandible ; Mandibular Advancement ; Orthognathic Surgery ; Osteotomy, Sagittal Split Ramus ; Overbite ; Recurrence ; Retrognathia*

Background: This study was designed to determine whether presynaptic receptor blockade could be differentiated from postsynaptic receptor blockade by examining the effect of increasing frequencies of indirect stimulation on partial twitch depression in vitro rat phrenic nerve hemidiaphragm preparations. Methods: After isolating rat phrenic nerve hemidiaphragm preparation, T200/T1 ratio (twitch height of the 200th stimuli divided by that of the 1st stimuli) at frequencies of 0.2, 0.5, 1.0, and 2.0 Hz using a drug concentration which provided approximately 20% twitch depression at 0.1 Hz was calculated. To compare T200/T1 ratios with TOF ratios, 2.0 Hz TOF response was measured immediately after 200th stimuli at either frequency of stimulation. Results: Hexamethonium caused a marked decrease in T200/T1 ratio at 0.5~2.0 Hz of stimulation, whereas alpha-bungarotoxin caused no change in T200/T1 ratios at up to 2.0 Hz of stimulation. The T200/T1 ratios produced by d-tubocurarine, vecuronium, mivacurium, and rocuronium located intermediate between alpha-bungarotoxin and hexamethonium, however significant differences among four drugs were found at 2.0 Hz. The propensity for decrease in T200/T1 ratios at 2.0 Hz might differ from this study: hexamethonium >d-tubocurarine >rocuronium >mivacurium = vecuronium >alpha-bungarotoxin. T200/T1 ratios at 2.0 Hz were not different from TOF ratios. Conclusions: When the observed effects in this study were provided with result of alpha-bungarotoxin acting predominantly at postsynaptic receptors and hexamethonium acting predominantly at presynaptic receptors, the effects of nondepolarizing muscle relaxants at each binding site could be differentiated by examining the T200/T1 ratios at 2.0 Hz.
Animals ; Binding Sites ; Bungarotoxins ; Depression* ; Hexamethonium ; Phrenic Nerve* ; Rats* ; Receptors, Presynaptic ; Tubocurarine ; Vecuronium Bromide

1.050 patients who visited orthodontic dental department from 1983 to 1994, were surveyed on the yearly tendency of orthodontic patient distribution and state by means of Angle's classification. The results were as follows : 1. There was increased visiting rate of patient per year and higher visiting rate in female than in male. 2. 8-15 age group was 61.4% in total visiting patients and over 20 age group was 18.5%, under 7 age group was 8.1%. 3. Class I malocclusion was 42.2%, class II div 1 was 22.5%, class II-2 was 3.9%, class III was 29.1% and cleft lip & palate was 2.0% in total visiting patient. 4. As showed the living distribution, Namgu and Susunggu's patients were 43.7% of the total patients. 5. There was increased tendency for the number of the patient to be received orthognathic surgery.
Cleft Lip ; Dentistry* ; Female ; Humans ; Male ; Malocclusion* ; Orthodontics* ; Orthognathic Surgery ; Palate

The nfa1 gene was cloned from a cDNA library of pathogenic Naegleria fowleri by immunoscreening; it consisted of 360 bp and produced a 13.1 kDa recombinant protein (rNfa1) that showed the pseudopodia-specific localization by immunocytochemistry in the previous study. Based on the idea that the pseudopodia-specific Nfa1 protein mentioned above seems to be involved in the pathogenicity of N. fowleri, we observed the effect of an anti-Nfa1 antibody on the proliferation of N. fowleri trophozoites and the cytotoxicity of N. fowleri trophozoites on the target cells. The proliferation of N. fowleri trophozoites was inhibited after being treated with an anti-Nfa1 polyclonal antibody in a dose-dependent manner for 48 hrs. By a light microscope, CHO cells co-cultured with N. fowleri trophozoites (group I) for 48 hrs showed severe morphological destruction. On the contrary, CHO cells co-cultured with N. fowleri trophozoites and anti-Nfa1 polyclonal antibody (1: 100 dilution) (group II) showed less destruction. In the LDH release assay results, group I showed 50.6% cytotoxicity, and group II showed 39.3%. Consequently, addition of an anti-Nfa1 polyclonal antibody produced a decreasing effect of in vitro cytotoxicity of N. fowleri in a dosedependent manner.
Animals ; Antibodies, Protozoan/*immunology ; Antigens, Protozoan/genetics/*immunology ; CHO Cells ; Dose-Response Relationship, Immunologic ; Female ; Hamsters ; Mice ; Mice, Inbred BALB C ; Naegleria fowleri/growth & development/immunology/*pathogenicity ; Protozoan Proteins/genetics/*immunology ; Recombinant Proteins/immunology ; Support, Non-U.S. Gov't

Until recently edrophonium has not been used in clinical anesthesis because of its short duration of action and poor anticholinesterase activity. However there has been a renewed interest in the use of edrophonium for the reversal of the new intermediate acting relaxants, vecuronium and atracurium, which have a fast spontaneous recovery rate. Edrophonim in sufficient dosages may produce a fast onset of antagonism of non-depolarizing neuromuscular blockade with minimal muscarinic side effects. The porpose of this study was therefore to compare the efficiency of edrophonium and neostigmine in reversal of a profound neuromuscular blockad following continuous infusion of vecuronium (0.06 mg/kg/hr). Recovery of T1 and T4 twitch height, change of heart rate and mean arterial pressure were obsered after antagonism with control mixture group (n=10): neostigmine 0.04mg/kg and atropin 0.02 mg/kg, and experimental mixture group (n=9): edrophoninm 0.5mg/kg and atropine 0.007 mg/kg were evaluated respectively at the 10% spontaneous recovery of T1 twitch height. Recovery of T1 was more faster in the edrophonium group than in the neostigmine group but it was significant until 5 minutes after antagonism (p<0.05) and recovery of T4 was also significantly faster in the edrophonium group until 5 minutes after antagonism but thereafter, conversly faster in the neostigmine group than in the edrophonium(p<0.05). Changes of heart rate with +/-5% after edrophonium administration were observed. We conclude that edrophonium provides a more rapid antagonism within 5 minutes after antagonizing vecuronium infusion, and small change in heart rate, but no other any advantage in using edrophomine instead of neostigmine for reversal after 5 minutes.
Arterial Pressure ; Atracurium ; Atropine ; Edrophonium* ; Heart Rate ; Neostigmine* ; Neuromuscular Blockade ; Vecuronium Bromide*

No abstract available.
Animals ; Coculture Techniques* ; Embryonic Structures* ; Mice*

No abstract available.