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The Relationship Between Young EFL Learners’ Vocabulary Knowledge and Listening Comprehension
Dayoung Joo(Dayoung Joo),Junkyu Lee(Junkyu Lee) 한국초등영어교육학회 2022 초등영어교육 Vol.28 No.3
This study investigates the degree to which an elementary school EFL learner’s level of second language (L2) vocabulary correlates to their L2 listening ability. The study aims to further identify whether or to what extent various measures of vocabulary knowledge predict the variance in L2 listening comprehension. In particular, the study focuses on the relatively unexplored area of phonological knowledge of vocabulary. Three phonological measures which tap into both vocabulary breadth and depth knowledge were adopted in this study: the receptive phonological vocabulary breadth knowledge (RVB), productive phonological vocabulary breadth knowledge (PVB), and phonological vocabulary depth knowledge (VD) measures. Twenty elementary school EFL learners participated in the study and were required to complete an L2 listening comprehension test, followed by three vocabulary knowledge tests. Correlation analysis revealed that RVB most strongly correlated with L2 listening comprehension score (r = .77). Stepwise multiple regression analysis showed that the best fitting model which consists of RVB and VD could predict about 75% of the variance in L2 listening comprehension. The findings indicate that phonological vocabulary knowledge is a significant predictor of L2 listening ability of young EFL learners.
Joo, Jin Hui,Youn, Dayoung,Park, Sun Young,Shin, Dong-Sik,Lee, Min Hee Elsevier 2019 Dyes and pigments Vol.170 No.-
<P><B>Abstract</B></P> <P>We have developed a mitochondria-targetable and red-emitting probe (<B>1</B>) that allows for the quantitative analysis of mitochondrial NAD(P)H in live human cells. Probe <B>1</B> is non-fluorescent and gets reduced in the presence of NAD(P)H to emit a strong fluorescence. This probe is highly selective to NAD(P)H over various potential biological interferants such as redox species, metals, anions, and other biomolecules. In addition, confocal microscopic images revealed the predominant accumulation of probe <B>1</B> into the mitochondria of human breast cancer cells (MDA-MB-231), as evident from the red fluorescence in response to NAD(P)H activity in glucose-treated cells as NAD(P)H induction model <I>vs.</I> cyanide 4-(trifluoromethoxy)phenylhydrazone-treated cells as NAD(P)H depletion model. Probe <B>1</B> can be used to differentiate between cancer (MDA-MB-231) and normal cells (NIH-3T3) based on mapping mitochondrial NAD(P)H-dependent fluorescence intensity. Probe <B>1</B> will be useful for various applications, ranging from elucidation of biological pathways to pathological diagnosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A mitochondria-targetable and red-emitting dicyanoisophorone was developed for imaging mitochondrial NAD(P)H. </LI> <LI> This probe is non-fluorescent and gets reduced in the presence of NAD(P)H to emit a strong fluorescence at 615 nm. </LI> <LI> The detection limit was estimated to be 1.2 μM of NADH. </LI> <LI> This probe accumulated into the mitochondria of cancer cells and displayed red fluorescence to NAD(P)H activity. </LI> <LI> The probe differentiated cancer and normal cells based on mapping mitochondrial NAD(P)H-dependent fluorescence intensity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Wu, Di,Ryu, Jae-Chan,Chung, Youn Wook,Lee, Dayoung,Ryu, Ji-Hwan,Yoon, Joo-Heon,Yoon, Juyoung American Chemical Society 2017 ANALYTICAL CHEMISTRY - Vol.89 No.20
<P>In this study, the far-red-emitting fluorescence probe <B>1</B>, containing a rhodamine derivative and a hydrazide reactive group, was developed for peroxynitrite detection and imaging. This probe, which is cell permeable and shows high sensitivity and selectivity in fluorometric detection of peroxynitrite over other ROS/RNS, was successfully utilized to detect exogenous and endogenous peroxynitrite in HeLa and RAW 264.7 cells, respectively. More importantly, <B>1</B> can also be used to detect endogenous peroxynitrite generated in <I>Pseudomonas aeruginosa</I> (PAO1)-infected mouse bone marrow-derived neutrophils. We anticipate that the new probe will serve as a powerful molecular imaging tool in investigations of the role(s) played by peroxynitrite in a variety of physiological and pathological contexts.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2017/ancham.2017.89.issue-20/acs.analchem.7b02707/production/images/medium/ac-2017-02707p_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac7b02707'>ACS Electronic Supporting Info</A></P>