• Title/Summary/Keyword: 생물 I

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The Effects of Taking Elective Science Courses in High School on Studying Science at the University Level (고등학교 과학 선택과목 이수가 대학에서의 과학 학습에 미치는 영향)

  • Hong, Mi-Young;Kim, Joo-Ah;Park, Hyun-Ju
    • Journal of The Korean Association For Science Education
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    • v.31 no.6
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    • pp.836-847
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    • 2011

  • This study investigated the effects of taking elective science courses in high school on studying science at the university level. The research methods undertaken for this study included surveys of college students in science areas. For physics and biology major students, no significant differences in achievement in the basic courses at the university level were found between the groups that took only Science I courses and the group took Science I and II courses. For chemistry major students, achievement for the group that took Chemistry I and II courses was significantly higher in the basic courses, while no significant differences between the two groups was found in the advanced courses. The perceptions of college students regarding the effects of their science learning experience in high school on learning science at the university level were investigated. All the college students perceived that whether or not they took Science II courses in high school, it did not affect their learning in basic science courses in college. They also perceived that students were able to overcome difficulties by making extra effort even if they did not take Science II courses in high school.

  • https://doi.org/10.14697/jkase.2011.31.6.836 인용 PDF KSCI

Isolation and Selection of Antagonistic Microbes for Biological Control of Zoysiagrass Large Patch Disease (한국잔디 갈색퍼짐병의 생물학적 방제를 위한 길항미생물의 분리 및 선발)

  • Ma, Ki-Yoon;Kwark, Soo Nyeon;Lee, Geung-Joo
    • Horticultural Science & Technology
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    • v.31 no.6
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    • pp.657-665
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    • 2013

  • A large patch disease caused by Rhizoctonia solani AG2-2 (IV) is a serious problem in Korean lawngrass (Zoysia japonica) sites including golf courses and sports fields in Korea. Antagonistic microorganisms against R. solani AG2-2 (IV) were isolated from various forest and crop soil sources in Southern Korea. Among the 61 isolates, I-009, FRIN-001-1, and YPIN-022 strains showing dramatic inhibition of the mycelial growth of R. solani AG2-2 (IV) in the pairing culture were selected as the most potential antagonistic microorganisms for this study. Based on the 16s RNA sequence comparison, I-009 and FRIN-001-1 isolates were identified as Bacillus spp., while YPIN-022 isolate belongs to the genus Pseudomonas. The greater inhibition (clear) zone between two edges of the selected and pathogenic microbes ranged from 11 to 15 mm in three selections, but the others averaged to 7 mm out of 30 mm distance. In another antifungal test using culture filtrate, those three isolates represented a range of 51.7 to 63.5% suppression potential. The selected isolates also inhibited significantly the stem-segment colonization by R. solani AG2-2 (IV) in vivo test by 28.1%, 43.0%, and 23.7% when inoculated with I-009, FRIN-001-1, and YPIN-022, respectively. The highest antagonistic activity for the large patch disease was demonstrated by the isolate FRIN-001-1, which will be useful for developing a bio-pesticide against Rhizoctonia.

  • https://doi.org/10.7235/hort.2013.13020 인용 PDF KSCI

Review of Methods for Measurement of Ecological Energy Conversion Rate by Herbivores in Offshore and Adjacent Sea (연근해 생물 잠재생산력 추정을 위한 Herbivores 단계의 에너지 전환 효율의 추정 방법에 관한 고찰)

  • KIM Yong-Sool
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.24 no.4
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    • pp.266-271
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    • 1991

  • Probably herbivorous fishes were visibility main body as aquatic substantial production in offshore and adjacent sea. It is a major problem to estimation of energy conversion rate by hervivores from primary production when to be measurement for potential productivity of herbivores as above meaning according to deductive method. This was deal with review of I index, with mean transfer efficiency from food in seawater to food in gut be eaten by a particular species. Yet $K_i$ was not settled with an established theory. In this review coefficients of food selection or electivity indices suggested by two Russian biologists, Ivlev and Sorygin, (r-p) /(r+p) and (r/p) were understand unsuitable to use with the transfer efficiency $K_i$. But CCOS that is one of community resemblance chord is suggested to be possible with someone a treatment, as (CCOS)$\times$(Filtering rate).

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