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NS and NNS Teacher Identities: An Analysis of Teacher-Student Interaction in EFL Classroom
Seojin Park 한국외국어교육학회 2017 Foreign languages education Vol.24 No.1
With a recognition of a profound effect that teacher identity has in students’ language learning, the present study explores how teacher identity, especially that of native speaking (NS) and nonnative speaking (NNS) teacher in EFL context, shapes the teacher-student interaction and influences students’ learning differently. Data was gathered through classroom observations and video recordings of teacher-student interaction of a total of six hours of class sessions. The data comes from the interactions of three nonnative Korean teachers, one native speaker, and six university students in Korean EFL co-teaching classroom. To analyze the data, the method of discourse analysis was used. The findings show that the native teacher acted as an interaction provoker who stimulated classroom discussion and also an expert of both target language and culture. On the other hand, nonnative teachers acted as an activity guider by helping student understand the classroom activities. As sharing L1 and the same culture, nonnative teachers were flexible with the language choice of the students and understood the difficulties they had in the class. The study further draws attention to the pedagogical implications regarding the co-teaching of native and nonnative teacher in EFL classroom.
Park, Jeongrak,Jang, Jin-Hyeok,Oh, Seojin,Kim, Minhye,Shin, Changhoon,Jeong, Minseok,Heo, Kyun,Park, Jong Bae,Kim, Sang Ryong,Oh, Yong-Seok Elsevier 2018 Cellular signalling Vol.44 No.-
<P><B>Abstract</B></P> <P>Lysophosphatidic acid (LPA) has been implicated in the pathology of human ovarian cancer. This phospholipid elicits a wide range of cancer cell responses, such as proliferation, trans-differentiation, migration, and invasion, via various G-protein-coupled LPA receptors (LPARs). Here, we explored the cellular signaling pathway via which LPA induces migration of ovarian cancer cells. LPA induced robust phosphorylation of ezrin/radixin/moesin (ERM) proteins, which are membrane-cytoskeleton linkers, in the ovarian cancer cell line OVCAR-3. Among the LPAR subtypes expressed in these cells, LPA<SUB>1</SUB> and LPA<SUB>2</SUB>, but not LPA<SUB>3</SUB>, induced phosphorylation of ERM proteins at their C-termini. This phosphorylation was dependent on the Gα<SUB>12/13</SUB>/RhoA pathway, but not on the Gα<SUB>q</SUB>/Ca<SUP>2+</SUP>/PKC or Gα<SUB>s</SUB>/adenylate cyclase/PKA pathway. The activated ERM proteins mediated cytoskeletal reorganization and formation of membrane protrusions in OVCAR-3 cells. Importantly, LPA-induced migration of OVCAR-3 cells was completely abolished not only by gene silencing of <I>LPA</I> <SUB> <I>1</I> </SUB> or <I>LPA</I> <SUB> <I>2</I> </SUB>, but also by overexpression of a dominant negative ezrin mutant (ezrin-T567A). Taken together, this study demonstrates that the LPA<SUB>1</SUB>/LPA<SUB>2</SUB>/ERM pathway mediates LPA-induced migration of ovarian cancer cells. These findings may provide a potential therapeutic target to prevent metastatic progression of ovarian cancer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LPA induces phosphorylation and activation of ERM proteins in ovarian cancer cells. </LI> <LI> The LPA<SUB>1</SUB>&LPA<SUB>2</SUB>/Gα<SUB>12/13</SUB>/RhoA pathway mediates activation of ERM proteins. </LI> <LI> The LPA<SUB>1</SUB>&LPA<SUB>2</SUB>/ERM pathway mediates LPA-induced migration of ovarian cancer cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>