• Title/Summary/Keyword: Natural Science

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The Opportunity to Learn About Korean Natural Environment in Schools (한국의 자연환경에 대한 학교 교육의 실태조사연구)

  • Kim, Chan-Jong
    • Journal of The Korean Association For Science Education
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    • v.13 no.2
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    • pp.210-218
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    • 1993

  • Scientific literacy for all became a new goal and introducing STS issues into science curriculum shows new trends in science education. The educational importance of natural environment of a region is increasing because it can serve as a vehicle to meet the new goal and trends of science education. The opportunity to learn about Korean natural environment in schools was investigated. The characteristics and unique patterns of Korean natural environment are not well reflected in the intended curriculum. School teachers mostly believe that education of Korean natural environment will greatly contribute to the students' learning of the subject matter they teach and environmental problems. However, they have limited opportunity to teach Korean natural environment. Various elective courses dealing with our natural environment should be provided in schools, especially for non-science majors. Out-of-school activities and facilities for Korean natural environment should be made available.

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Five newly recorded species of cyanobacteria in Korea

  • So-Won, Kim;Nam-Ju, Lee;Do-Hyun, Kim;Ji-Ho, Song;Hye-Ryeung, Wang;Ok-Min, Lee
    • Journal of Species Research
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    • v.11 no.4
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    • pp.296-309
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    • 2022

  • Five newly recorded species of cyanobacteria in Korea are Sphaerospermopsis reniformis(Aphanizomenonaceae) from Chungju-si, Chungcheongbuk-do; Pelatocladus maniniholoensis (Hapalosiphonaceae) from Ulleung-gun, Gyeongsangbuk-do; Tolypothrix carrinoi (Tolypothrichaceae) and Myxacorys chilensis (Leptolyngbyaceae) from Suwon-si, Gyeonggi-do; and Tildeniella torsiva (Oculatellaceae) from Gunsan-si, Jeollabuk-do. These species are morphologically similar to each of its corresponding type species, and clustered in the same clade with respective type species in the phylogeny using 16S rRNA. The similarity of 16S rRNA sequences was more than 98.5% with each of its respective type species.

  • https://doi.org/10.12651/JSR.2022.11.4.296 인용 PDF KSCI

Preparation and Mesomorphic Properties of tetramethylene-1,4-bis (p-oxybenzylidene p-substituted aniline) (Tetramethylene-1,4-bis(p-oxybenzylidene p-substituted aniline)의 합성과 액정성)

  • Choi, Ok-Byung;Park, Joo-Hoon;Lee, Yong-Seop;Lee, Whan-Myung;Kim, Ki-Hwan;Lee, Eun-Kyoung;Ko, Kyung-Kon;Lee, Eun-Sang;So, Bong-Keun;Lee, Chang-Joon;Lee, Soo-Min
    • Korean Chemical Engineering Research
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    • v.45 no.2
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    • pp.155-159
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    • 2007

  • A series of new dimesogenic compounds having two identical, terminal Schiff base type mesogens and a central tetramethylene spacer were synthesized. Their thermotropic and mesomorphic properties of the compounds were investigated by differential scanning calorimetry and polarizing microscopy. The compounds with X= -F, -Cl, -Br, -CN and $-OCH_3$ were enantiotropically nematic liquid crystal. In contrast, the compounds with X= -I and $-CF_3$ were non-liquid crystal. The nematic forming efficiency of the groups was in the order of -CN > $-OCH_3$ > -Br > -Cl > -F.

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Nucleotide Sequence of 16S rRNA Gene from Streptomyces melanosporofaciens 7489

  • LEE, DONG-SUN;SUNG-OUI SUH;SEON-KAP HWANG;TAEG-KYU KWON;TAE-HO KIM;WOO-CHANG SHIN;SOON-DUCK HONG
    • Journal of Microbiology and Biotechnology
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    • v.6 no.5
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    • pp.364-365
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    • 1996

  • A region encoding the 16S rRNA was cloned by PCR from Streptomyces melanosporofaciens 7489 and sequenced by the chain-termination dideoxy sequencing method. A phylogenetic tree constructed by sequence alignment of 24 Streptomyces species suggests that there is little evolutionary distance between this strain and Streptomyces rimosus.

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