• 제목/요약/키워드: Biological Sciences

검색결과 8,714건 처리시간 0.042초

Comparison of plant species diversity and its relationship with physical environmental factors in Gotjawal Forest, Jeju Island, Republic of Korea, using the modified Whittaker plot method

  • Ju-Seon Lee;Young-Han You;Ji-Won Park;Yeo-Bin Park;Yoon-Seo Kim;Jung-Min Lee;Hae-In Yu;Bo-Yeon Jeon;Kyeong-Mi Cho;Eui-Joo Kim
    • Journal of Ecology and Environment
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    • 제48권3호
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    • pp.247-255
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    • 2024
  • Background: To effectively understand and evaluate plant diversity in a specific area and make meaningful comparisons between regions, standardized methods that measure diversity irrespective of survey plot size are crucial. This study proposes a model equation for comparing plant species diversity using the modified Whittaker plots. Plant species diversity was measured in two Gotjawal areas on Jeju Island, where the coexistence of northern and southern limit species significantly impacts diversity. By analyzing the relationship between plant species diversity and environmental factors, the study clarified the characteristics of plant and habitat diversity in the Gotjawal ecosystem. Results: The species richness of vascular plants, herbaceous plants, and woody plants increased with area and was higher in Jeoji Gotjawal than in Seonheul Gotjawal. Similarly, the species turnover rate (slope value) was higher in Jeoji Gotjawal (4.37) than in Seonheul Gotjawal (3.85). This indicates that the species richness in Jeoji Gotjawal increases more with the expansion of the survey area (1-1,000 m2), reflecting a faster species turnover rate. Additionally, in Gotjawal areas, species richness increased with greater leaf litter depth, elevation, slope, and rock ratio. These results indicate that differences in plant species diversity were attributed to soil environmental factors. Conclusions: The plant species diversity of Gotjawal, surveyed using standardized methods, was lower than that of forested areas in the central region of South Korea where the same method was applied. Most previous studies on species diversity likely compared diversity without considering a consistent survey area. Therefore, when comparing plant species diversity domestically and globally, it emphasizes the need for the use of standardized survey methods.

Two New Records of Ascomycetes from Crop Field Soils in Korea

  • Adhikari, Mahesh;Kim, Hyun Seung;Gurung, Sun Kumar;Bazie, Setu;Lee, Hyun Gu;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제45권3호
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    • pp.167-174
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    • 2017
  • In the ongoing survey of fungal diversity in Korea, two Ascomycetes species, namely Rhinocladiella similis and Toxicocladosporium irritans, were isolated in 2016. These species were identified based on the internal transcribed spacer region and morphological characteristics. This is the first report of these species in Korea, and the morphological characteristics and images of the fungi are presented.

Aphanoascus fulvescens: A New Record from Crop Field Soil in Korea

  • Gurung, Sun Kumar;Adhikari, Mahesh;Bazie, Setu;Kim, Hyun Seung;Lee, Hyun Gu;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제45권2호
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    • pp.107-113
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    • 2017
  • Aphanoascus fulvescens KNU16-343 was isolated from crop field soil and identified based on morphological and molecular characteristics. The shape and size of conidia and conidiophores, as well as the internal transcribed spacer region of rDNA, confirmed that the isolate was A. fulvescens. This is the first report of this fungal species in Korea.

A New Record of Pseudeurotium bakeri from Crop Field Soil in Korea

  • Adhikari, Mahesh;Kim, Sangwoo;Yadav, Dil Raj;Um, Yong Hyun;Kim, Hyun Seung;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제44권3호
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    • pp.145-149
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    • 2016
  • Pseudeurotium bakeri KNU14-21 isolated from crop field soil is a previously unreported fungal species in Korea. This fungal species was identified through morphological and molecular characteristics. Based on the shape and size of conidia and conidiophores as well as the internal transcribed spacer region of rDNA, the isolate was confirmed to be Pseudeurotium bakeri. This species has not been previously reported from Korea, and this is the first report of its incidence in Korea.

Phialocephala lagerbergii: A New Record from Crop Field Soil in Korea

  • Adhikari, Mahesh;Kim, Sangwoo;Yadav, Dil Raj;Um, Yong Hyun;Kim, Hyung Seung;Lee, Hyang Burm;Lee, Youn Su
    • 한국균학회지
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    • 제44권3호
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    • pp.132-137
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    • 2016
  • A unrecorded hyphomycete species of Phialocephala was isolated for the first time during the investigation of fungal community in the soil samples collected from different regions of Korea. The fungal isolate was identified as Phialocephala lagerbergii, based on the morphological characteristics and phylogenetic analysis of the ribosomal DNA sequence. In addition, cultural and micro-morphological features were described in detail.

Directed Evolution of a β-Glucosidase for Improved Functions as a Reporter in Protein Expression

  • Lim, Ho-Dong;Han, So-Young;Park, Gi-Hye;Cheong, Dae-Eun;Kim, Geun-Joong
    • 한국미생물·생명공학회지
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    • 제50권2호
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    • pp.240-244
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    • 2022
  • Precisely reliable and quantitative reporters can provide phenotypes that are consistent with research goals in protein expression. Here, we developed an improved reporter mATglu III 5 by directed evolution using a versatile β-glucosidase ATglu derived from Agrobacterium tumefaciens. When expressed in hosts, a vector containing this mutant distinctly showed a colored or fluorescent phenotype, according to the supplemented substrate, without any inducer. Analysis of mATglu III 5 showed it to be fully functional in fusion state with oligomeric proteins, especially under non-induction conditions, thereby offering an alternative to conventional reporters.