• Environmental Analysis Health and Toxicology
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• 제21권1호
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• pp.45-56
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• 2006

This study was conducted to investigate seasonal distributions of fine particles ($PM_{2.5}$) and associated polycyclic aromatic hydrocarbons (PAHs) at three cities. $PM_{2.5}$ samples were collected on glass fiber filters at urban (Chuncheon), metropolitan (Seoul), and industrial complex sites (Ulsan) from September, 2002 to February, 2004 using the Andersen FH 95 Particulate Sampler. About five 24-hour samples were collected from each site per season. The filters were analyzed for mass and six selected PAHs concentrations. $PM_{2.5}$ concentrations were the highest either in winter or spring, which could be attributed to the increase of fossil fuel combustion in winter or the transport of yellow sand to the Korean peninsula from China in spring, respectively. Regional $PM_{2.5}$ concentrations were higher in the order of Seoul>Chuncheon>Ulsan without statistical difference among cities. The filters were extracted using dichloromethane in an ultrasonicator and analyzed for six PAHs (anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, and benzo[a]pyrene) with HPLC. Total PAHs concentrations were statistically different among seasons in each site, and the highest concentrations were observed in winter at each sampling site. For total samples collected, the median total PAHs concentrations in Chuncheon ($4.6ng/m^3$) and Seoul ($4.4ng/m^3$) were approximately two times higher than that in Ulsan ($2.1ng/m^3$). Chrysene was a component found in the highest proportion among total PAHs at each site. Carcinogenic risks calculated based on the BaP toxic equivalency factors (TEFs) over the whole sampling period were higher in the order of Chuncheon>Seoul>Ulsan. This study suggests that the atmosphere of Chuncheon is contaminated with particulate matter and PAHs at the levels equivalent to those of Seoul and that an appropriate measure needs to be taken to mitigate human health risks from inhalation exposure to airborne fine particles.

• 대한수의학회지
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• 제33권4호
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• pp.623-632
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• 1993

This study was conducted to develop a sensitized latex-antigen for serodiagnosis of toxoplasmosis in animals. Tachyzoites of T gondii(RH-strain) harvested from mouse peritoneal cavity were purified through the filtraton of polycarbonate membrane(pore size, $3.0{{\mu}m}$, Costar Co.) and disrupted by ultrasonicator. The tachyzoite suspension was ultracentrifuged for 30 min at $60,000{\times}g(4{^{\circ}C})$ and the supernatant was used as a water-lysate antigen. Polystyrene latex particles of $0.8{{\mu}m}$ in diameter(Sigma) were used for the preparation of sensitized latex-antigen suspension. The several parameters including the preparation conditions, incubation buffer. serum dilution buffer and stability of agglutination reactions were evaluated and the results obtained were summarized as follows : 1. The antigen consisting of a water-lysate of T gondii tachyzoites was adsorbed onto polystyrene latex particles of $0.8{{\mu}m}$ in diameter by adding a latex suspension to an equal volume of diluted antigen solution and by incubating the mixture at $37{^{\circ}C}$ under different conditions. 2. The optimum incubation buffer used for the antigen sensitization was 0.1M Tris-HCl buffer(pH 8.0). 3. The optimum serum dilution buffer used for the latex agglutination test was 0.1M Tris-HCl-NaCl buffer(pH 7.4) containing 300 mM NaCl. But 0.1M Tris-HCl-NaCl buffer(pH 7.4) containing 300-600 mM NaCl, 0.5% BSA and 0.01% Tween-20 improved the agglutination pattems and cleared the background of microplate well without the effects on L.A titer. 4. The time required for antigen sensitization was 40 and 60 min in incubation buffer(pH 8.0) at $37{^{\circ}C}$. But the optimun time for antigen sensitization was min at $37{^{\circ}C}$. 5. The optimun quantity of antigen absorbed on latex particles for proper agglutination was the range of 20 to $32{\mu}g$ of latex particles. 6. The optimun concentration of the latex-antigen suspension for the proper agglutination reaction was determined as 0.2%(w/v). 7. The specificity, rapidity and simplicity of the latex-particle agglutination test suggested that it might be adaptable to large scale serum screening.

• Parasites, Hosts and Diseases
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• 제27권3호
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• pp.177-186
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• 1989

병원성이 강한 Naegleria fowleri ITMAP 359, 병원성이 약한 Naegleria jadini 0400, 비병원성인 Naegleria gruberi EGB를 ICR마우스에 각각 감염시켰을 때 세포매개 성 면역반응의 차이를 관찰하고 이들 아메바를 감염시킨 후 경과된 감염 시간에 따른 세포매개 성 면역반응과 혈청내 항체가의 변동을 관찰하였다. N. fowleri를 감염시킨 마우스의 사망률은 75.7%, N. jadini를 감염시킨 실험군에서는 6.2%, N. gruberi 감염에 의한 마우스의 사망은 전혀 관찰되지 않았다. 지연형 과민반응은 N. fowleri, 감염시에 감염 초부터 대조군에 비해 반응이 증가하였으나 7일 후에는 감소하였다. N. jadini 감염 시에도 감염 후 1일째부터 과민반응이 증가하였으며 감염기간이 지나갈수록 점차 감소하였다. 또 N. gruberi 감염시에는 대조군과 비교할 때 변화를 나타내지 않았다. 7림프구의 아세포화 정도는 N. fowleri 감염시 감염 10일 후 증가하였으나 대조군에 비해 유의한 차이는 없었다. N. jadini에 감염된 경우는 대조군과 차이가 없음을 알 수 있었고, N. gruberi 감염시에는 감염 후 감소하는 경향이 있었다. B림프구의 아세포화 정도는 N. fowleri 감염군, N. gadini 감염군 및 N. gruberi 감염군에서 대조군과 차이가 없었다. N. fowleri에 감염된 마우스의 혈청내 항체가는 감염 7일 후부터 증가하였고, N. jadini 감염시에는 14일 후 증가하였으며, N, gruberi게 감염된 마우스의 항체가는 대조군과 차이가 없었다.