• Title/Summary/Keyword: biology education

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A Case Study on Foraging Behavior of Oriental White Storks (Ciconia boyciana) in the Variation of Prey Density and Water Depth (먹이 밀도와 수심에 따른 황새(Ciconia boyciana)의 섭식 행동에 대한 사례연구)

  • Sung, Ha-Cheol;Kim, Jung-Hee;Cheong, Seok-Wan;Kim, Su-Kyung;Jo, Jee-Yeon;Cheong, Mi-Ra;Choi, Yu-Seong;Park, Shi-Ryong
    • Korean Journal of Environmental Biology
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    • v.27 no.2
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    • pp.155-163
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    • 2009

  • The Oriental white stork (Ciconia boyciana) is an endangered species in Korea as well as in the world. In order to provide information on foraging habitats for releasing storks to the wild, we studied the foraging behavior of the species according to different food densities and water levels. We released two individuals, male and female, after enclosing a study site with a fence and cutting out a part of two or three primary feathers. Research was conducted from 20 June to 16 August 2008 at Whawon-ri, Mewon-myung, Chungcheongbuk-do, South Korea. We investigated habitat patch usage, foraging efficiency, and foraging methods of the feeding individuals in the different food densities and water levels. The storks invested more for foraging time and trials, and they captured more food in a habitat of high food density than others. The female invested more time and captured food most in a habitat of lowest water depth while the male in a habitat of middle water depth. However, foraging efficiency did not differ significantly among habitats of food density and water depth, and only differed between male and female by ways of foraging method. From this study we suggest that the storks select foraging habitats and foraging methods under different conditions of food density and water depth.

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A Study of the Development and Using of Teaching Materials for Biology in Japan (일본에 있어서의 생물교재의 개발과 활용에 관한 연구)

  • Park, In-Keun
    • Journal of The Korean Association For Science Education
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    • v.7 no.2
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    • pp.45-59
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    • 1987

  • The purpose of the present study is to show the way to develop and use the teaching materials for biology in Japan. This study was mainly carried out in documents. The following suggestions should be taken in moderate consideration: 1. Private enterprises as well as the government make heavy investments and careful considerations for the promotion of the science education including biology education. 2. Among in-service teachers one or two volunteer(s) chosen for special training course managed by the local education center are cultivated as excellent teachers on the development and using of teaching materials through an intensive study and training for six months or twelve months. 3. Most research groups consist of specialists in every field and they carry out studying the development of teaching materials in biology.

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Ginseng-derived type I rhamnogalacturonan polysaccharide binds to galectin-8 and antagonizes its function

  • Yi Zheng;Yunlong Si;Xuejiao Xu;Hongming Gu;Zhen He;Zihan Zhao;Zhangkai Feng;Jiyong Su;Kevin H. Mayo;Yifa Zhou;Guihua Tai
    • Journal of Ginseng Research
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    • v.48 no.2
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    • pp.202-210
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    • 2024

  • Background: Panax ginseng Meyer polysaccharides exhibit various biological functions, like antagonizing galectin-3-mediated cell adhesion and migration. Galectin-8 (Gal-8), with its linker-joined N- and C-terminal carbohydrate recognition domains (CRDs), is also crucial to these biological processes, and thus plays a role in various pathological disorders. Yet the effect of ginseng-derived polysaccharides in modulating Gal-8 function has remained unclear. Methods: P. ginseng-derived pectin was chromatographically isolated and enzymatically digested to obtain a series of polysaccharides. Biolayer Interferometry (BLI) quantified their binding affinity to Gal-8, and their inhibitory effects on Gal-8 was assessed by hemagglutination, cell migration and T-cell apoptosis. Results: Our ginseng-derived pectin polysaccharides consist mostly of rhamnogalacturonan-I (RG-I) and homogalacturonan (HG). BLI shows that Gal-8 binding rests primarily in RG-I and its β-1,4-galactan side chains, with sub-micromolar KD values. Both N- and C-terminal Gal-8 CRDs bind RG-I, with binding correlated with Gal-8-mediated function. Conclusion: P. ginseng RG-I pectin β-1,4-galactan side chains are crucial to binding Gal-8 and antagonizing its function. This study enhances our understanding of galectin-sugar interactions, information that may be used in the development of pharmaceutical agents targeting Gal-8.

  • https://doi.org/10.1016/j.jgr.2023.11.007 인용 PDF