• Title/Summary/Keyword: Advanced Chemistry

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Changes in Epistemological Beliefs in Chemistry Following Completion of Advanced Chemistry in Science High School Students

  • Dong-Seon Shin;Min Jung Jung;Jong Keun Park
    • International Journal of Advanced Culture Technology
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    • v.12 no.1
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    • pp.209-219
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    • 2024

  • We studied the effects of science high school students on the change of epistemological beliefs in chemistry and the academic achievement of chemistry by completing 'advanced chemistry'. For seven months from July 2023 to January 2024, 80 first-year students at G Science High School in Gyeongnam were surveyed and analyzed for epistemological beliefs about chemistry before and after classes in advanced chemistry. Chemistry academic achievement was classified by 'upper' and 'lower' levels based on the end-of-semester grades of 'advanced chemistry' in the second semester of the first year and analyzed with the SPSS 28 program. After completing advanced chemistry, the epistemological belief in chemistry increased in the proportion of favorable responses. After completing advanced chemistry, the proportion of favorable responses increased in detailed factors such as 'effort', 'math link', 'outcome', 'reality link', and 'concepts', while the 'visualization' factor decreased. Although completing 'advanced chemistry' positively changed students' epistemological beliefs about chemistry, visual expression showed little contribution to understanding chemical concepts. Based on the above results, we will have to focus on the design of instructors' teaching-learning, such as learner-centered inquiry experiments, creative visual expressions, etc., for successful chemistry teaching-learning.

  • https://doi.org/10.17703/IJACT.2024.12.1.209 인용 PDF

Highly Fluorescing Solid DNA-Cationic Polyelectrolyte Complexes Prepared from a Natural DNA and a Poly(fluorenevinylene-alt-phenylene) Bearing Quaternary Ammonium Pendants

  • Yu, Young-Jun;Kwon, Young-Wan;Kim, Kyu-Nam;Do, Eui-Doo;Choi, Dong-Hoon;Jin, Jung-Il;Shin, Hee-Won;Kim, Yong-Rok;Kang, Ik-Joong;Mikroyannidis, John A.
    • Macromolecular Research
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    • v.17 no.4
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    • pp.245-249
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    • 2009

  • A fluorescing, copolymer(Q)-bearing, quaternary ammonium pendant was mixed with excess natural salmon sperm DNA with a molecular weight of $1.3{\times}10^6$(2,000 base pairs) to afford highly fluorescing, complex mixtures. The fluorescence life-time of the polymer Q was greatly increased when mixed with DNA: for the mixture of Q:DNA=1:750 the fast and slow decay lifetimes increased from ca. 10 to 100 ps and from 20 ps to ca. 1 ns, respectively. The enhanced fluorescence of the mixtures was ascribed to efficient compartmentalization and reduced conformational relaxation of the polymer Q by complexation with excess DNA.

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