• Environmental Analysis Health and Toxicology
• /
• 제19권1호
• /
• pp.1-24
• /
• 2004

Since dioxins became a serious concern in Korea, a significant number of investigations have been conducted to address diverse issues related to dioxins. However, the results have not been organized for ready access and use. The principal purposes of the work were to ⅰ) provide an archive of dioxin researches in Korea and ⅱ) give an overview of dioxin contamination. The focus of this work was placed on the contamination levels and characteristics concerning the waste incinerators emissions, environmental media, and biological samples(fishes/shellfishes, foods, and human body). Principal component analysis was conducted to identify common and/or unique features and the important variables associated with the congener patterns. From a comprehensive search of academic journals, research and monitoring project reports, dissertations, and periodicals of other forms, a total of 115 counts were found that met the purposes of this study. The contamination levels of various samples were summarized and compared to those reported in foreign literatures. The congener patterns varied largely with environmental media and distinguished particularly by OCDD, 1,2,3,4,6,7,8-HpCDF, and OCDF for the samples within the same media. The proximity to emission sources differentiated the congener patterns in air and soil samples by the fraction of OCDD.

• 농약과학회지
• /
• 제16권4호
• /
• pp.302-307
• /
• 2012

친환경 유기농자재 rotenone의 홍고추 중 잔류특성을 조사하고 가공계수를 산출하기 위하여 시험포장에 시험농자재를 7일 간격으로 2회 살포한 후 경시적으로 채취하여 잔류량을 분석하였다. 홍고추와 건고추 중 rotenone의 정량한계는 각각 0.03과 0.07 mg/kg이었으며, 분석법의 회수율은 각각 89.52-97.86%와 85.76-91.61%이었다. 잔류농약 분석 결과 홍고추 중 시험농자재의 잔류량은 0.03-0.39 mg/kg이었으며, 건고추의 경우 0.07-0.75 mg/kg으로 잔류량은 경시적으로 감소하였다. 건조에 의한 홍고추 중 rotenone의 가공계수는 2.03-3.13으로써 건조에 따라 잔류농도가 2-3배 증가하였다. 그러나 건조 전 홍고추 중 rotenone의 감소계수는 0.38-0.59로서 건조 전 홍고추 중 rotenone의 일부는 건조 과정 중 소실된 것으로 나타났다.

• 농약과학회지
• /
• 제15권4호
• /
• pp.441-452
• /
• 2011

농경지 중 내분비계장애 추정농약의 잔류 실태를 조사하기 위하여 시설재배 토양을 경기도 가평 등 전국 40개 지역에서 총 40점을 채취하여 현재 우리나라에서 분류한 내분비계장애추정농약 40종 중 등록되어 사용중인 alachlor를 포함한 16종의 농약을 대상으로 GC-ECD 및 HPLC-DAD/FLD를 이용한 다성분동시분석법 및 개별분석법으로 분석하였다. 시험농약의 검출한계는 0.0004-0.005 mg/kg이었으며, 각 시험농약의 회수율 72.69-115.28%의 범위였다. 조사대상 토양 40점 중 16점의 시료에서 cypermethrin 등 4종의 내분비계장애추정농약이 검출되어 37.5%의 검출율을 보였다. 그 중 endosulfna은 12지역에서 검출되어 가장 높은 검출빈도를 보였다. 또한 GUS로 판단할 때 대부분의 검출 농약은 지하수를 오염시킬 가능성이 거의 없었으나 살균제 vinclozolin은 약간의 지하수를 오염시킬 가능성이 있는 것으로 추정되었는데 이는 수용성이 높고 토양 흡착성이 낮은 특성 때문인 것으로 보인다.

• Journal of Species Research
• /
• 제10권4호
• /
• pp.321-335
• /
• 2021

In 2020, a total of 12 bacterial strains were isolated from soil after a comprehensive investigation of indigenous prokaryotic species in Korea. It was determined that each strain belonged to independent and predefined bacterial species, with high 16S rRNA gene sequence similarity (>98.7%) and formation of a robust phylogenetic clade with the closest species. This study identified four families in the phylum Actinobacteria, two families in the phylum Proteobacteria, one family in the phylum Bacteroidetes one family in the phylum Firmicutes; and four species in the family Nocardiaceae, two species in the family Nocardioidaceae, one species in the family Cellulomonadaceae, one species in the family Hymenobacter, one species in the family Methylobacteriaceae, one species in the family Microbacteriaceae, one species in the family Bacillaceae and one species in the family Sphingomonadaceae. There is no official report of these 12 species in Korea, so they are described as unreported bacterial species in Korea in this study. Gram reaction, basic biochemical characteristics, colony, and cell morphology are included in the species description section.

• 한국균학회지
• /
• 제50권4호
• /
• pp.347-355
• /
• 2022

A fungal isolate belonging to the phylum Ascomycota was isolated and identified as Talaromyces veerkampii in 2017 during a survey of fungal diversity in field soils in Korea. This fungal isolate was identified and described based on macro- and micromorphological and molecular characterization. The identification was also based on partial 18S-ITS1-5.8S-ITS2-28S rDNA and calmodulin (CaM)-encoding gene sequencing data. Talaromyces veerkampii has not been previously reported in Korea. Thus, we report here a newly discovered species from soil in Korea along with its morphological and molecular characteristics.

• 한국환경농학회지
• /
• 제41권4호
• /
• pp.276-281
• /
• 2022

BACKGROUND: Plastics that are used in our daily lives largely end up in the environment. In agricultural environments, plastic wastes and microplastics can be found due to the uses and improper management of plastic products (e.g., vinyl greenhouses and mulching vinyl). Microplastics can also interact with contaminants in the agricultural environment. Therefore, this study was set to investigate the sorption characteristics of tetracycline, one of widely used antibiotics, on microplastics. METHODS AND RESULTS: The sorption tests were carried out with the tetracycline solutions (0-30 mg L^-1) and microplastic films prepared from low density polyethylene (LDPE) and polyvinyl chloride (PVC). The residual tetracycline concentrations were analyzed and fitted to the Freundlich and Langmuir isotherm models. The tetracycline sorption patterns on LDPE and PVC films were described better with the Freundlich isotherm model than the Langmuir isotherm model. The isotherm model parameters suggested that the maximum sorption amount of tetracyline was greater for PVC, while the sorption affinity was greater for LDPE. CONCLUSION(S): Different types of microplastics can have different sorption characteristics of tetracycline. Therefore, there is a need for continuous research on the interaction of various types and shapes of microplastics and contaminants in the environment.

• 한국약용작물학회지
• /
• 제22권6호
• /
• pp.489-496
• /
• 2014

Polygonatum is a genus placed in the family Liliaceae, distributed throughout the Northern Hemisphere and 16 of the species are grown naturally in Korea. In oriental medicine, the rhizomes of Polygonatum have been used as two different medicines, Okjuk (Polygonati odorati Rhizoma) and Hwangjeong (Polygonati Rhizoma). However, it is difficult to identify the morphological and chemical differences between the medicinal groups and thus easy to confuse the one with the other. Therefore, a clear classification standard needs to be established so as to be able to discriminate between them. In the study, the morphological characteristics of the plants, Polygonatum spp., were examined. Then, the differences in SNPs among the DNA sequences of 7 of the Polygonatum spp. and 1 of the Disporum spp. were analyzed by DNA barcoding with rpoC1, rpoB2, matK, and psbA-trnH of the cpDNA region. In the results, three regions, rpoC1, rpoB2, and matK were useful for discriminating the species, P. stenophyllum and P. sibiricum. Furthermore, it was possible to discriminate the individual germplasm within the species by using the combination of the results obtained from rpoB2, rpoC1, and matK.

• Mycobiology
• /
• 제40권3호
• /
• pp.195-201
• /
• 2012

During the investigation of Korean indigenous fungi from Seoul, three genera-Fuscoporia, Porostereum, and Trametopsis, and four species-Fuscoporia senex, Phlebia acerina, Porostereum spadiceum, and Trametopsis cervina were found. Their morphological characteristics were examined and their identification was confirmed by molecular analysis based on internal transcribed spacer (ITS) and nuclear large subunit ribosomal DNA region sequences. These fungi are new to Korea and registered here with descriptions.

• 한국토양비료학회지
• /
• 제49권1호
• /
• pp.87-92
• /
• 2016

With the population growth and industrialization, the characteristics of discharged waste water and sewage have become more diverse. The removal of phosphorus (P) in the wastewater is essential for the prevention of eutrophication in the river and stream. This study was performed in order to estimate the field application of the Bacillus sp. 3434 BRRJ. Bacillus sp. 3434 BRRJ was cultured in the raw wastewater and synthetic medium at the 5 L reactor. The best optimum conditions for P removal by Bacillus sp. 3434BRRJ in the synthetic medium at the 5 L reactor were as follows: temperature, $30^{\circ}C$; P concentration, 20 mg/L; carbon sources, glucose + acetate (1:1); oxygen concentration, alternatively anaerobic and aerobic conditions. P removal efficiency under the optimum condition was 89.4%. In case of wastewater, P removal efficiency was 95.5% under controlled at $30^{\circ}C$. Through this study we confirmed that P removal by Bacillus sp. 3434BRRJ in case of wastewater was as effective as the synthetic medium. It is considered that Bacillus sp. 3434 BRRJ can be applied to the treatment of wastewater in order to biologically remove P from the wastewater on a large scale.

• 농약과학회지
• /
• 제20권1호
• /
• pp.23-29
• /
• 2016

국내산 유통 수삼 중 농약의 잔류특성을 구명하기 위하여 전국 15개 지역의 45개 재래시장 상점에서 45점의 시료를 채취한 후 GC-MS/MS와 LC-MS/MS를 이용한 다성분동시분석법을 이용하여 잔류농약을 분석하였으며, 검출된 농약은 GC-ECD/NPD를 이용한 개별분석으로 수삼 중 잔류농약을 정량하였다. 잔류농약 분석 결과 총 45점의 시료에서 cypermethrin, fenitrothion, fludioxonil, thifluzamide, tolclofos-methyl이 검출되었으며, 검출율은 35.6%이었다. Tolclofos-methyl이 가장 높은 검출빈도를 보였으며, 인삼에 대한 안전사용기준과 잔류허용기준이 설정되어 있지 않은 fenitrothion이 검출되었다. 수삼에서 검출된 농약은 모두 잔류허용기준 미만이었다. 수삼 중 검출된 농약의 일일섭취허용량 대비 일일섭취추정량은 0.03-16.67%이었다.