1.Fates of degranulated mast cells and extruded granules responded to homologous antigen in rats infected with Clonorchis sinensis.
Yung Kyum AHN ; Chin Thack SOH
The Korean Journal of Parasitology 1977;15(2):93-99
: Fates of degranulated mast cells by challenge of the homologous antigen to the Clonorchis sinensis infected rats, and the extruded granules were examined by means of light and electron microscopy. The whole experiment was carried out six weeks after the Clonorchis infection and an observation was made at 1, 3, 5, 8, 12 hours after the antigen challenges. The abdomen of the infected rat was cut open by 2 centimeters and the antigen was directly inoculated to mesentery, then again sutured. According to the scheduled period, the rat was sacrificed. The challenged portion was cut out and followed by dying procedure. The results of the observation are summarized as follows: Degranulation was observed within one hour without noticeable change of the granules. Three hours after the inoculation, the shed granules were phagocytized by macrophage surrounding the mast cells. They were aggregated in the cytoplasm. In 5 days phagocytosis phenomenon were almost completed but still some granules were scattered in surroundings upto 12 hours. The nucleus of the degranulated cell appeared clearly in contrast to normal cells which were killed with granules. Membrane became to normal, and the granules which were not expelled out agglomerated in a large cavity. The above resulst suggest that the partially degranulated mast cells do not disintegrate, but recover to normal, and expelled granules are phagocytized by macrophages.
parasitology-helminth-trematoda
;
Clonorchis sinensis
;
pathology
;
histology
;
rat
;
phagocytosis
;
mast cell
;
granule
2.Epidemiological study on Metagonimus yokogawai infection along Boseong River in Jeonra Nam Do, Korea.
Chin Thack SOH ; Yung Kyum AHN
The Korean Journal of Parasitology 1978;16(1):1-13
Prevalence study of Metagonimus yokogawai infection, survey of intermediate hosts of Metagonimus yokogawai and food habits of raw sweetfish among inhabitants along Boseong river (120 km), Jeonra Nam Do (province) were carried out. The results are summarized as follows: Among 360 examined, the egg positive case were 128(35.6 percent); male 112(46.7 percent), female 16(13.3 percent). The prevalence rates were different by geographical areas; 42.4 percent in down stream, 49.4 percent in middle stream and 13.3 percent in upper stream. By ages, highest rate, 53.6-59.1 percent was observed among 30-49 group (male 69.6-73.0 percent, female 15.8-35.5 percent). Eggs per gram of feces were 2,084 (200-12,280) in average; down stream 1,708, middle stream 2,590, upper stream l,550. By social strata, the prevalence showed differences; 24.8 percent in primary schoolchildren, 78.4 percent in school teacher and local officers, 30.6 percent in general inhabitants. Clonorchis sinensis infected cases in the areas were 21(5.8 percent) out of 360 examined, and 90.5 percent of them showed mixed infection with Metagonimus yokogawai. Cercariae of Metagonimus yokogawai from the lst intermediate host, Semisulcospira sp., in down and middle streams were detected from 32 snails (5.9 percent) out of 545 examined. All the 22 Plecoglossus altivelis which were caught from the down stream were infected with metacercariae of Metagonimus yokogawai. The number of the metacercariae detected was 22,650 per fish in average, and the number increased from August to October. Experiences of raw sweetfish intake of the inhabitants were found in 208(58.4%) among 356 interviewed by questionaire form (male 76.7 percent, female 20.7 percent). Means of acquisition of the sweetfish were mostly by purchase 68.8 percent, and seasonally in summer. Reason of the raw sweetfish intake was due to the flavor, 83.2 percent. The fish were mixed in soy sause with vinegar before the intake.
parasitology-helminth-trematoda
;
Metagonimus yokogawai
;
metagonimiasis
;
epidemiology
3.Flea fauna of rodents in coastal region of Korea :Insecticide susceptibility test of Xenopsylla cheopis.
Yung Kyum AHN ; Chin Thack SOH
The Korean Journal of Parasitology 1974;12(1):33-44
A survey on rats and rat-fleas was performed in costal area of Korea during 1972 in Inchon, Kunsan, Yosu, Busan and other areas. The number of the caught rats was 1,448. Total number of collected fleas was 2,480. Geographical distribution were described. Flea index was in 1.71 total. Mothly flea indices were 0.35-0.84 in January to March, 2.13-2.59 in April to June, 0.58 in July and 1.82-4.91 in August to November. Mortality rate of X. cheopsis to various concentration of DDT in 1 hour exposure were 43.8 % in 4.0 %, 30.4 % in 1.0 %. In 24 hours exposure, the mortalities were 100 % in 4.0 %, 91.5 % in 2.0 %, 73.5 % in 1.0 % and 37.0 % in 0.5 % DDT.
parasitology-arthropoda-flea
;
rat
;
Xenopsylla cheopis
;
Monopsyllus anisus
;
Nosopsyllus fasciatus
;
Leptopsylla segnis
;
Ctenophthalmus cong. congeneroides
;
Ctenocephalides canis
;
Nosopsyllus nicanus
;
Rhadinopsylla attenuata
;
epidemiology
;
insecticide
;
DDT-chemotherapy
;
DDT
4.Two Cases of Mercury Dermatitis Following Amalgam Dental Restorations.
Mi Hyung CHO ; Hwa Yung AHN ; Hong Il KOOK
Korean Journal of Dermatology 1985;23(5):650-653
Sensitivity to mercury appears to be not uncommon and perhaps the commonest contact with mercury in the general population is by amalgam dental restorations. Recently, we have experienced 2 cases of mercury dermatitis following amalgam dental restorations which were confirmed by the patch test. We report our cases with the patch test results and review the literatue on previous reports.
Dermatitis*
;
Patch Tests
5.Two Cases of Lipodystrophia Centrifugalis Abdominalis Juvenilis.
Hwa Yung AHN ; Ki Bum MYUNG ; Hong Il KOOK
Korean Journal of Dermatology 1984;22(6):679-683
We report 2 cases who have been diagnosed as lipodystrophia centrifugalis abdominalis juvenilis. The case 1 is l2 year-old girl. She had well-defined depression of skin on both inguinal area, lower portion of chest and both flanks which was noticed at the age of 7. The case 2 is 16 year-old boy with depressed lesions on Rt. inguinal area and abdomen which were noticed at the age of 6. Biopsy specimen showed absence of subcutaneous fat tissue in both cases.
Abdomen
;
Adolescent
;
Biopsy
;
Depression
;
Female
;
Humans
;
Male
;
Skin
;
Subcutaneous Fat
;
Thorax
6.A Case of Multiple Bowen' s Disease Accompanied with Arsenic Keratosis of the Palm and Sole.
Hwa Yung AHN ; Jeong Hee HAHM ; Hong Il KOOK
Korean Journal of Dermatology 1984;22(5):557-560
No abstract available.
Arsenic*
;
Keratosis*
7.A Case of Atypical Sessile Dermatofibroma.
Yung Jae LEE ; Sung Ku AHN ; Seung Hun LEE
Annals of Dermatology 1993;5(2):130-132
We report a case of a morphologic variant of dermatofibroma. A coin sized, brownish, shinny, somewhat fibrotic pedunculated tumor in a 39-year-old male was diagnosed as a sclerosing hemangioma, a type of dermatofibroma histopathologically. Its dome shape morphology was unusual in comparison with the typical morphology of dermatofibroma that we know.
Adult
;
Histiocytoma, Benign Fibrous*
;
Humans
;
Male
;
Numismatics
8.A Case Report of Giant Hydronephosis.
In Ho SONG ; Yung Hun PACK ; Hi Joong AHN
Korean Journal of Urology 1969;10(1):21-24
A case of giant hydronephrosis containing 9,500 cc, simulating ascites due to 'cirrhotic liver in a twenty. three year old male, is presented. The differential diagnosis and the important clinical, laboratory and X-ray features are discussed with brief literatual review.
Ascites
;
Diagnosis, Differential
;
Humans
;
Hydronephrosis
;
Liver
;
Male
9.STRAIN AND TEMPERATURE CHANGES DURING THE POLYMERIZATION OF AUTOPOLYMERIZING ACRYLIC RESINS.
Hyung Jun AHN ; Chang Whe KIM ; Yung Soo KIM
The Journal of Korean Academy of Prosthodontics 2001;39(6):709-734
The aims of this experiment were to investigate the strain and temperature changes simultaneously within autopolymerizing acrylic resin specimens. A computerized data acquisition system with an electrical resistance strain gauge and a thermocouple was used over time periods up to 180 minutes. The overall strain kinetics, the effects of stress relaxation and additional heat supply during the polymerization were evaluated. Stone mold replicas with an inner butt-joint rectangular cavity (40.0x25.0mm, 5.0mm in depth) were duplicated from a brass master mold. A strain gauge (AE-11-S50N-120-EC, CAS Inc., Korea) and a thermocouple were installed within the cavity, which had been connected to a personal computer and a precision signal conditioning amplifier (DA 1600 Dynamic Strain Amplifier, CAS Inc., Korea) so that real-time recordings of both polymerization-induced strain and temperature changes were performed. After each of fresh resin mixture was poured into the mold replica, data recording was done up to 180 minutes with three-second interval. Each of two poly (methyl methacrylate) products (Duralay, Vertex) and a vinyl ethyl methacrylate product (Snap) was examined repeatedly ten times. Additionally, removal procedures were done after 15, 30 and 60 minutes from the start of mixing to evaluate the effect of stress relaxation after deflasking. Six specimens for each of nine conditions were examined. After removal from the mold, the specimen continued benchcuring up to 180 minutes. Using a waterbath (Hanau Junior Curing Unit, Model No.76-0, Teledyne Hanau, New York, U.S.A.) with its temperature control maintained at 50degrees C, heat-soaking procedures with two different durations (15 and 45 minutes) were done to evaluate the effect of additional heat supply on the strain and temperature changes within the specimen during the polymerization. Five specimens for each of six conditions were examined. Within the parameters of this study the following results were drawn : 1. The mean shrinkage strains reached -3095mu epsilon, -1796mu epsilon and -2959mu epsilon for Duralay, Snap and Vertex, respectively. The mean maximum temperature rise reached 56.7degrees C, 41.3degrees C and 56.1degrees C for Duralay, Snap, and Vertex, respectively. A vinyl ethyl methacrylate product (Snap) showed significantly less polymerization shrinkage strain (p<0.01) and significantly lower maximum temperature rise (p<0.01) than the other two poly (methyl methacrylate) products (Duralay, Vertex). 2. Mean maximum shrinkage rate for each resin was calculated to ?31.8mu epsilon/sec, -15.9mu epsilon/sec and ?31.8mu epsilon/sec for Duralay, Snap and Vertex, respectively. Snap showed significantly lower maximum shrinkage rate than Duralay and Vertex (p<0.01). 3. from the second experiment, some expansion was observed immediately after removal of specimen from the mold, and the amount of expansion increased as the removal time was delayed. For each removal time, Snap showed significantly less strain changes than the other two poly (methyl methacrylate) products (p<0.05). 4. During the external heat supply for the resins, higher maximum temperature rises were found. Meanwhile, the maximum shrinkage rates were not different from those of room temperature polymerizations. 5. From the third experiment, the external heat supply for the resins during polymerization could temporarily decrease or even reverse shrinkage strains of each material. But, shrinkage re-occurred in the linear nature after completion of heat supply. 6. Linear thermal expansion coefficients obtained from the end of heat supply continuing for an additional 5 minutes, showed that Snap exhibited significantly lower values than the other two poly (methyl methacrylate) products (p<0.01). Moreover, little difference was found between the mean linear thermal expansion coefficients obtained from two different heating durations (p>0.05).
Acrylic Resins*
;
Electric Impedance
;
Fungi
;
Heating
;
Hot Temperature
;
Kinetics
;
Microcomputers
;
Polymerization*
;
Polymers*
;
Relaxation
10.A Case of Pigmented Follicular Cyst.
Yung Jae LEE ; Seung Ku AHN ; Seung Hun LEE
Annals of Dermatology 1995;7(1):96-98
We report a pigmented follicular cyst (PFC) in a 40-year-old male manifestated clinically as pigmented nevus. Histopathologic findings revealed an infundibular cyst in the mid dermis containing a small amount of keratinous material. The cystic wall consisted of four or five layers of squamous epithelium with a granular layer with abundant keratohyaline granules and the cyst wall contained one hair follicle. It must be differentiated from other pigmented lesions of over-lying skin such as eruptive vellus hair cyst, apocrine hydrocystoma and melanocytic nevus coexistance of an epidermoid cyst. Surgical excision and histopathological examination are necessary for an accurate diagnosis in pigmented lesions.
Adult
;
Dermis
;
Diagnosis
;
Epidermal Cyst
;
Epithelium
;
Follicular Cyst*
;
Hair
;
Hair Follicle
;
Humans
;
Male
;
Nevus, Pigmented
;
Skin