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이용만,안규동,이성수,함정오,김화성,리갑수,이병국 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.2
근접작업이 시력약화의 원인이 될 수 있는가를 알아보기 위하여 전자부품을 제조하는 2개 사업장에서 1991년에서 1993년까지 입사한 근로자들 중에서 근접작업으로 인정되는 마이크로칩을 조립하는 근접작업자 306명을 조사군으로, 대조군은 세탁기 타이머 및 일반 기계기구를 조립하는 작업자 154명, 계 460명을 선정하였다. 이들 대상자는 1991년 입사자는 1993, 1994, 1995년 시력을 조사하였으며, 1992년 입사자는 1993, 1994, 1995년 3년동안 조사를 하였으며, 1993년 입사자는 1994, 1995년 2년간 시력을 조사하였다. 대상자 중에서 입사시 안경을 착용한 근로자는 82명(17.8%)이었다. 따라서 남자 근로자와 안경착용자를 제외한 여성 근로자들 335명만을 추적 조사하여 다음과 같은 결론을 얻었다. 조사군에서 입사시 시력 1.0 이상이었던 근로자의 분포는 취업 1년 후 약 25-35% 정도 감소하였으며, 2년후에는 약 40-60% 정도의 감소를 나타내었고, 3년 후 약 50-65% 정도로 감소하였고 4년후에는 약 65% 이상 감소하였다. 그러나 대조군에서는 1.0 이상의 시력을 보였던 근로자들의 비율이 취업 1년 또는 2년 후 15-30%의 감소를 보이고 있으나 그 이후에는 큰 변동이 없었다. 이들의 시력변화를 근무년수에 따라 알아보기 위하여 조사된 시력을 순위변수로 하여 Kruskall-Wallis 검정을 시행한 결과 조사군, 대조군 모두에서 근속년수에 따른 순위의 합의 평균이 년차적으로 유의하게 감소하였으나, 입사시부터 근속년수에 따른 조사군과 대조군과의 순위합의 평균에 의한 시력차 비교에서 입사시 조사군의 순위합의 평균이 유의하게 높았던 것이 근무기간에 따라 대조군의 평균이 높아지면서 통계적 유의성이 없고 대체적으로 1년 이후부터 변화가 적은 것으로 나타나 근접작업으로 인한 시력약화를 추정할 수 있었다. This study was carried out to investigate that the close distance works were associated with decreased visual acuity. 306 workers were subjects who had been recruited from 1991 to 1993 in two electronic parts manufacturing factories, and 154 workers were controls who had been employed from 1991 to 1993 in launder machine timer and general machine assembly factories. Subjects who had been employed in 1991 and 1992 were follow up from 1993 to 1995, and subjects who had been employed in 1993 were from 1994 to 1995. The male workers as well as glasses wearing workers were excluded. Only 335 female workers were followed up to study the change of visual acuity. The results were as follows; The rate of workers with visual acuity over 1.0 at recruit year in subjects group was decreased about 25-35% after 1 year, 40-60% after 2 years, 50-65% after 3 years, and 65% after 4 years. While, the rate of workers with visual acuity over 1.0 at recruit year in control group was decreased about 15-30% after 1 or 2 years, and there was no more additional visual acuity reduction after then. Kruskall-Wallis test was performed to investigate the change of visual acuity in subject and control group by work duration. The means scores of ranks in both group were significantly decreased by work duration. The mean scores of ranks in subject group at recruit year were significantly higher than those in control group at recruit year, but these differences were disappeared after 1 year work. Therefore, this suggest that close distance workers may be affected their visual acuity.
Anodonta arcaeformis와 Cristaria plicata 유생의 미세구조적 연구
박갑만 關東大學校 醫科大學 醫科學硏究所 2002 關東醫大學術誌 Vol.6 No.1
Two species of freshwater mussels in Korean, Anodonta araceformis and Cristaria plicata, were compared in regard to the vaious texononmical characteristics of glochildian. The out-demibranchs of all females of species have served as marsupial pouch. The breeding season of these two species was the winter breeder. The glochidia of A. arcaeformis and C. plicata were separated one by with the mucous strings. The shape of the glochidium of A. arcaeformis and C. plicata is apparently sub-triangular and is average size is 250 μm in 240 μ in height and 230×310 μm, respectively. Two glochidial shell valves are of same size, kept together by ligament of 235 μm and 220 μm in width. Each of the glochidial shell valves has studded with many spines on the superior face. a large area at the apex of the valve surrounding the base of the hook is provided with numerous small spines which become progressively smaller towards the periphery of the area. A larval thread of A. arcaeformis and C. plicata, without any accessory structure and 2.6 μm and 2.4 μm in diameter, emerges from a canal located at center of ventral plate of the mantle. The results indicated that the glochidial morphology be reveal characters useful for the classification of different species and for the interrelations between genera.
권오길,박갑만,이준상,송호복 江原大學校 附設 環境硏究所 1991 環境硏究 Vol.8 No.-
This study was carried out to determine the attachment parts and rates on the host fish and the successive stages of the glochidial encystment. A scanning electron microscope observation of the glochidia, the larvae of freshwater brivalve, Anodonta arcaeformis flavotincta, on the host fish, Carassius auratus, was conducted. The attachment rates on the host fish were 30.1%, 22.3% on the pectoral, the caudal, and the pelvic and anal fin, respectively. Glochidia, once attached to the host, have become encysted within 27 hours. The glochidia in fish tissues have sloughed between 13 days and 15 days when the water temperature was 16℃ in laboratory. During encystment, the epithelial cells of the host fish migrated actively toward the attached glochidia and covered them. In the encystment process, the encysted tissues in the host have become loose in seven days and exposured a pat of the glochidium in eight days after infection. No changes of the glochidial size have found before attachment and after sloughing.
Gab-Man Park,Oh-Kil Kwon 江原大學校 附設 環境硏究所 1992 環境硏究 Vol.9 No.-
Chromosome numbers are reported for 11 species 5 families of Korean freshwater Gastropoda snails. A cytotexanomic study was observed during spermatogenesis, as well as during cogenesis and mitovic divisions. The chromosome preparations were made on gonad by the usual air-drying method of Kligerman and Bloom(1997) slightly modified by the present author. The results obtained in the present study are summaried as follows: In Viviparidae, C. chinensis malleata chromosome numbers of 18(2n) was counted. The chromosome complement of C. chinensis malleata consists of two pairs of metacentric and seven pairs of submetacentric chromosomes. In Bithyniidae. P. manchuricus chromosome numbers of 34(2n) was counted and the mototic chromosome complement showed three pairs of meta-, ten pairs of submata- and four pairs of telocentric chromosomes. In Pleurocaridae, chromosome numbers of six species containing genus Semisulcospira were counted 18 pairs, The mitotic chromosome complement of S.livertina consists of nine pairs of meta-, eight pairs of submeta- and one pair of telocentric. six pairs of meta-, eleven pairs of submeta- and one pair of telocentric in S. gottschei, nine pairs of meta- and nine pairs of submeta-chromosomes in S. forticosta and S. tegulata, seven pairs of meta-, ten pairs of submeta- and one pair of telocentric chromosomes in S. coreana, eight pairs of meta-, six pairs of sumeta- and four pairs of telocentric chromosomes in S, sp. In Lymnaeidea, 17 pairs of chromosomes were observed in R. auricularia coreana and 16 pairs in A. ollula. The chromosome complement of R. auricularia coreana consists of five pairs of meta- and twelve pairs of submetacentric chromosomes. The chromosome complement of A. olluia consists of five pairs of meta-, nine pairs of summeta- and two pairs of telocentric chromosomes. In Planorbidae, chromosome numbers of II. cantori was 36(2n) counted. The chromosome complement of II. cantori consists of fourteen pairs of meta- and four pairs of submetacentric chromosomes.