• Title/Summary/Keyword: Freshwater plants

Search Result 62, Processing Time 0.025 seconds

New Record of three Penicillium species isolated from the Freshwater Environment in Korea

  • Mun, Hye Yeon;Jeon, Yu Jeong;Goh, Jaeduk
    • The Korean Journal of Mycology
    • /
    • v.48 no.4
    • /
    • pp.491-498
    • /
    • 2020
  • In this study, we aimed to observe the diversity of aquatic fungi by collecting deposits of soil, plants, and plant litter from streams and rivers. Three Penicillium strains were isolated from soil in streams. Based on the morphological characteristics and phylogenetic analysis using DNA sequences of the internal transcribed spacer, β-tubulin and calmodulin genes, the isolates were identified as Penicillium guanacastense, P. saturniforme, and P. scabrosum. These three fungi have not yet been reported in Korea.

Freshwater Habitats of Pectinatella magnifica (Leidy 1851) Living in South Korea (낙동강 본류에 출현하는 담수 태형동물 Pectinatella magnifica (Leidy 1851)의 서식환경 연구)

  • Jeong, Hyungi;Lee, Kyung-Lak;Choi, Byoung-ki;Kwon, Heongak;Park, Hae-Kyung;Jeong, Gang-yong;Yu, Jae Jeong
    • Korean Journal of Environmental Biology
    • /
    • v.33 no.3
    • /
    • pp.352-359
    • /
    • 2015
  • In order to investigate the occurrence of Pectinatella magnifica in Nakdong River, extensive series of sampling was conducted through July to November of 2014. Results revealed that these species show preference to attach themselves on natural substrates over artificial substrates. P. magnifica does not show preference for specified substrates, but itappearthat availability of substrates determines their specific distribution. Considering that most commonly found substrates in Nakdong River were natural substrates such as dead twig, woody plants or aquatic plants, it is possible that high availability of substrates is one of the principal factors which increase the rates of growth and distribution of P. magnifica.

Complete genome sequencing of Pseudomonas fluorescens NBC275, a biocontrol agent against fungal pathogens of plants and insects (식물 및 곤충의 곰팡이 병원균에 항균력을 가진 Pseudomonas fluorescens NBC275 균주의 유전체 염기서열)

  • Dutta, Swarnalee;Yu, Sang-Mi;Nagendran, Rajalingam;Jeong, Sang Chul;Lee, Yong Hoon
    • Korean Journal of Microbiology
    • /
    • v.55 no.2
    • /
    • pp.157-159
    • /
    • 2019
  • Pseudomonas fluorescens NBC275 (Pf275) isolated from soil sample collected at riverside of Nakdonggang showed antagonistic activity against fungal pathogens of plants and insects. Here we present complete genome sequence of Pf275. The genome comprises of 6,610,362 bp with GC content of 60.9%, which includes 5,869 predicted protein-coding genes, 16 rRNAs, and 65 tRNAs. Genome analysis revealed gene clusters encoding antimicrobial secondary metabolites such as pyoverdine, 2, 4-diacetylphloroglucinol, and phenazine, which are known to play essential roles in biocontrol of diseases.

Application of HACCP principles to MAR-based drinking water supply system (MAR기반 음용수 공급 시스템에의 HACCP 원리 적용)

  • Ji, Hyon Wook;Lee, Sang-Il
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.30 no.5
    • /
    • pp.533-543
    • /
    • 2016
  • Supplying clean and safe water to people is facing both quantitative and qualitative challenges. Due to climate change, access to freshwater becomes increasingly difficult, while pollution from various sources decreases the public trust in water quality. Managed aquifer recharge (MAR) which stores and uses surface water in aquifer is receiving attention as a new technology to secure freshwater. Recently, there is a global expansion in the attempt to combine general purification plants and hazard analysis and critical control point (HACCP) which manages all the process from raw material to consumer for food safety. This research is about an attempt to apply HACCP to the drinking water supply process using MAR to secure both quantity and quality of drinking water. The study site is a MAR plant being constructed in the downstream area of the Nakdong River Basin, South Korea. The incorporation of HACCP with MAR-based water supply system is expected to enhance the safety and reliability of drinking water.

Experimental Study of a Small Desalination Device Using Engine Waste Heat (엔진 폐열을 이용한 소형담수화장치의 실험적 연구)

  • Lee, Imkyeong;Ko, Gwang Soo;Park, Youn Cheol
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
    • /
    • v.18 no.1
    • /
    • pp.12-19
    • /
    • 2022
  • Desalination has the advantage of being easy to supply water resources. However most desalination devices are developed mainly for large plants and it is not common to use desalination system for a small fishing ship. More than 50% of the input fuel energy of the small shipbuilding's engine is wasted without reused in a ship, and it is necessary to improving the fuel efficiency of the small fishing ship. In this study, a desalination device using waste heat from engine of the ships was developed. As results, it was found that if the condensing chamber uses a fan to circulate the water vapor, the freshwater production was up to 40.0% higher, and the freshwater production efficiency was up to 30.1% increased when the fan was operated.

Four Endophytic Ascomycetes New to Korea: Cladosporium anthropophilum, C. pseudocladosporioides, Daldinia eschscholtzii, and Nigrospora chinensis

  • Lee, Dong Jae;Lee, Jae Sung;Lee, Hyang Burm;Choi, Young-Joon
    • The Korean Journal of Mycology
    • /
    • v.47 no.3
    • /
    • pp.187-197
    • /
    • 2019
  • Ascomycota is the largest phylum of the Fungi, including approximately 6,600 genera. They are often isolated from soils, indoor air, and freshwater environments, but also from plants as pathogens or endophytes. In this study, four species of Ascomycota (two of Cladosporium and one of each Daldinia and Nigrospora) were collected from the leaves of four woody plants (Camellia japonica, Ginkgo biloba, Quercus sp., Vitis vinifera). Their cultural characteristics were investigated on five different media (PDA, V8A, CMA, MEA, CZA) at 3 days after incubation at $25^{\circ}C$ in darkness. BLASTn search and phylogenetic analysis were performed using the internal transcribed spacer (ITS) rDNA sequences, in addition to tef1 gene sequences for Cladosporium species. Based on the cultural, morphological, and phylogenetic data, the isolates were identified as Cladosporium anthropophilum, Cladosporium pseudocladosporioides, Daldinia eschscholtzii, and Nigrospora chinensis. Previously, some members of Cladosporium and Nigrospora have been recorded as endophytes inhabiting the leaves and stems of various plants, whereas Daldinia eschscholtzii is a wood-inhabiting endophyte or wood-decaying fungus. To our knowledge, this is the first report of these four ascomycetes in Korea.

Features and Functions of Purple Pigment Compound in Halophytic Plant Suaeda japonica : Antioxidant/Anticancer Activities and Osmolyte Function in Halotolerance

  • Chung, Sang Ho
    • Korean Journal of Plant Resources
    • /
    • v.31 no.4
    • /
    • pp.342-354
    • /
    • 2018
  • Suaeda japonica is a halophytic plant that lives in mudflat at intertidal zone of western and southern coastal areas of Korea. The seawater-living plants showed a purple color during their whole life. In contrast, freshwater-living plants displayed a green color in leaves. When seawater-living plants were transferred to potting soil, the purple color was gradually changed to green in the leaves. The extracted purple pigment compound exhibited typical characteristics of betacyanin that were represented by water solubility, pH- and temperature-dependent color changes, sensitivity to light, UV-Vis spectra, and gel electrophoretic migration pattern. The LC-MS analysis of the extracted pigment compound showed the presence of two major protonated molecular ions ($[M+H]^+$) at m/z 651.1 and m/z 827.1. Antioxidant activity of the pigment compound was determined using stable free radical DPPH assay. It was found to have an antioxidant activity that is linearly increased in proportion to the reaction time for up to 30 min, and the activity was comparable to that of control BHA at 9.0 mg/ml. The anticancer activity against several tumor cell lines was also examined following the MTT assay. The significant growth inhibitory effect was observed on two tumor cell lines, SW-156 (human kidney carcinoma) and HEC-1B (human endometrial adenocarcinoma). Probably, the pigment compound may function as an osmolyte to uphold halotolerant physiological processes in saline environment.

Morphological and Genetic Species Identification in the Chironomidae Larvae Found in Tap Water Purification Plants in Jeju (제주 정수장에서 출현한 깔따구과 유충의 형태 및 유전학적 분석)

  • Kwak, Ihn-Sil;Park, Jae-Won;Kim, Won-Seok;Park, Kiyun
    • Korean Journal of Ecology and Environment
    • /
    • v.54 no.3
    • /
    • pp.240-246
    • /
    • 2021
  • The Chironomidae is a benthic macroinvertebrate commonly found in freshwater ecosystems, along with Ephemeroptera and Trichoptera, which can be used for environmental health assessments. There are approximately 15,000 species of Chironomidae worldwide, but there are limited studies on species identification of domestic Chironomidae larvae. In the present study, we carried out species classification of the Chironomidae larvae that found in Jeju's tap water purification plants using morphological characteristics and genetic identification based on cytochrome c oxidase subunit I (COI) gene of the mitochondrial DNA. Body shape, mentum, antenna, mandible in the head capsule, and claws were observed in the larvae for morphological classification. Analysis of 17 larvae collected from faucets and fire hydrants of domestic tap water purification plants revealed the presence of two species, including 14 Orthocladius tamarutilus and 3 Paratrichocladius tammaater. These results will aid the use of the criteria information about species classification of the Chironomidae for water quality management in water purification plants and diversity monitoring of freshwater environments.

Morphological and Genetic Species Identification in the Chironomus Larvae (Diptera: Chironomidae) Found in Domestic Tap Water Purification Plants (국내 수돗물 정수장에서 발견된 깔따구 유충(파리목: 깔따구과)의 유전적-형태적 종 동정 연구)

  • Kwak, Ihn-Sil;Park, Jae-Won;Kim, Won-Seok;Park, Kiyun
    • Korean Journal of Ecology and Environment
    • /
    • v.53 no.3
    • /
    • pp.286-294
    • /
    • 2020
  • The Chironomus(Diptera: Chironomidae) is a freshwater benthic invertebrate that is an important indicator organism used for environmental pollution and water quality monitoring. In this study, we performed morphological classification and genetic species identification using the cytochrome c oxidase subunit I (COI) gene on mitochondrial DNA for an accurate species classification of Chironomus larvae found in tap water purification plants in Incheon, Korea. Twenty larvae in six water purification plants consist of four species, including twelve Chironomus kiiensis, six Chironomus flaviplumus, one Chironomus dorsalis, and one Polypedilum yongsanensis (not included Genus Chironomus). Morphological characteristics of each larvae were identified based on the head capsule, the mentum, the mandible, the antenna, and the claw. Based on the COI sequences of 21 individuals of 17 Chironomus species registered in NCBI Genbank, phylogenetic analysis indicated that the 20 individuals investigated in this study consist of the same clade with corresponding species of the high homology (99~100%) including C. kiiensis, C. flaviplumus, C. dorsalis, and P. yongsanensis. These results will be used as main classification indicator for monitoring freshwater ecosystems by providing integrated morphological and genetic information for the species identification of Korean Chironomus.

Cost Reduction for Small-Scale Desalination Plants (소규모 해수담수화 시설의 생산비용 절감 방안)

  • Park, Nam-Sik;Park, Jun-Yeong;Mun, Yu-Ri;Kim, Ja-Kyum
    • Journal of Korea Water Resources Association
    • /
    • v.44 no.10
    • /
    • pp.809-817
    • /
    • 2011
  • We analyzed various cost components for approximately 40 small-scale island desalination plants operated by K-water. A significant factor affecting desalination cost was found, and we proposed a way to reduce desalination costs. All plants considered were reverse osmosis (RO) facilities. TDS concentrations of feed water varied from less than 1,000 mg/L (practically considered freshwater) to over 30,000 mg/L (nearly seawater). Analysis of desalination costs from 2005 to 2009 indicated that maintenance, labor, and energy were the three biggest components that accounted for 50.6%, 36.9% and 7.8%, respectively. It was well known that TDS of feed water directly affected energy needed for RO process. In this study we found that maintenance cost was also directly related to feed water TDS. This finding indicated that lowering feed water TDS might result in significant desalination cost reduction.