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Dembereldorj, Uuriintuya,Kim, Mira,Kim, Semi,Ganbold, Erdene-Ochir,Lee, So Yeong,Joo, Sang-Woo The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.45
<P>Both <I>in vitro</I> and <I>in vivo</I> glutathione (GSH)-triggered anticancer drug releases were monitored in real time from the PEGylated graphene oxide (PEG-GO) platform. The assembly of the anticancer drug doxorubicin (DOX) on PEG-GO was verified by UV-Vis absorption and infrared spectroscopic tools. The fluorescence of DOX appeared to be quenched significantly by PEG-GO. A part of the initial DOX (10<SUP>−4</SUP> M) in PEG-GO was found to be released by ∼23.5% after treatment with 2 mM glutathione (GSH) within 15 min. Our fluorescence colocalization experiments indicated that PEG-GO–DOX was endocytosed and localized in either lysosomes or endosomes of intracellular compartments. Using fluorescence imaging techniques in real time, we were able to observe an approximately 2.5 times higher <I>in vitro</I> drug release in the live cells by externally triggering glutathione ethyl ester (GSH-OEt) rather than endogeneous GSH. <I>In vivo</I> fluorescence images of DOX were obtained with an order of magnitude larger intensity from the subcutaneous site in living mice after treatment with 0.3 mg of GSH. A real-time release of DOX on PEG-GO at the intended locus can be achieved <I>in vivo</I> after an external triggering of GSH.</P> <P>Graphic Abstract</P><P>Real-time monitoring of glutathione (GSH)-induced anticancer drug release was achieved using the PEGylated graphene oxide (PEG-GO) platform both <I>in vitro</I> and <I>in vivo</I>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34853e'> </P>
Dembereldorj, Uuriintuya,Joo, Sang-Woo Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
Adsorption structures of the self-assembled thin films of $\alpha$-cyano-4-hydroxycinnamic acid (CHCA) anchoring on $TiO_2$ surfaces have been studied by using temperature-dependent diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy. From the presence of the strong $\nu(COO^-)$ band at ~1390 $cm^{-1}$ along with the disappearance of the OH bands in the carboxylic acid group in the DRIFT spectra at room temperature, CHCA appeared to adsorb onto $TiO_2$ surfaces as a carboxylate form. The absence of the out-of-plane benzene ring modes of CHCA in the DRIFT spectra suggests a rather vertical orientation of CHCA on $TiO_2$. Above ~220$ ^{\circ}C$, CHCA seemed to start to thermally degrade on $TiO_2$ surfaces referring from the disappearance of most vibrational modes in the DRIFT spectra, whereas the $\nu$(C ≡ N) bands were found to remain relatively conspicuous as the temperature increased even up to ~460$^{\circ}C$.
Discriminatory experiences of international students in South Korea
Dembereldorj Zoljargal,Suren Chimed 한국교육정치학회 2014 敎育政治學硏究 Vol.21 No.2
The study explains discriminatory experiences of international students in one of the campuses in South Korea through the lens of neo-racism. Neo-racism is a theory of segregation that postulates discrimination is based on individual’s national identity, culture, and country of origin. For deeper understanding discriminatory perceptions of international students, the study applied a qualitative study with semi-structured interviews with purposive sampling at one aggressively internationalizing university. The study found implicit and explicit forms of discriminatory experiences, discriminatory perceptions of exclusion, different treatments based on nationality, lack of cultural knowledge, stereotype, and English language ability. Drawing from the findings, the study concludes that discriminatory experiences of international students are more status-based rather than country of origin based in a context of South Korea. It suggests that discrimination as segregation exists, and therefore, it is desirable to consider this issue into relevant policies and practices.
Uuriintuya Dembereldorj,주상우 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
Adsorption structures of the self-assembled thin films of α-cyano-4-hydroxycinnamic acid (CHCA) anchoring on TiO2surfaces have been studied by using temperature-dependent diffuse reflectance infrared Fourier-transform (DRIFT)spectroscopy. From the presence of the strong ν(COO−) band at ~1390 cm-1 along with the disappearance of the OH bands in the carboxylic acid group in the DRIFT spectra at room temperature, CHCA appeared to adsorb onto TiO2 surfaces as a carboxylate form. The absence of the out-of-plane benzene ring modes of CHCA in the DRIFT spectra suggests a rather vertical orientation of CHCA on TiO2. Above ~220 oC, CHCA seemed to start to thermally degrade on TiO2 surfaces referring from the disappearance of most vibrational modes in the DRIFT spectra, whereas the ν(C ≡ N) bands were found to remain relatively conspicuous as the temperature increased even up to ~460 C.
Ock, K.S.,Dembereldorj, U.,Park, J.,Ganbold, E.O.,Kim, S.,Shin, H.C.,Joo, S.W. Pergamon 2013 Spectrochimica acta. Part A, Molecular and biomole Vol.102 No.-
The structure and stability of d-penicillamine-capped gold nanoparticles (d-Pen Au NPs) were studied using spectroscopic tools. The synthesis of d-Pen Au NPs was examined using high-resolution transmission electron microscopy (HR-TEM), UV-vis absorption spectroscopy, and circular dichroism (CD). Temperature-dependent reversible structural changes of d-Pen Au NPs were observed using infrared spectroscopic tools. The three thiol, carboxyl, and amino binding groups of d-Pen were presumed to interact with Au NP surfaces on the basis of the infrared spectral features. d-Pen appeared to form quite a stable structure and desorb at a high temperature above 453K on Au NPs. Our deconvolution analysis indicated the ν<SUB>s</SUB>(COO<SUP>-</SUP>) and ν<SUB>as</SUB>(COO<SUP>-</SUP>) carboxylate bands at ~1392 and ~1560cm<SUP>-1</SUP> appeared to be weakened, whereas the amino band at ~1595cm<SUP>-1</SUP> remained strong in increasing the temperature from 293 to 373K. On the other hand, the intensities of the zwitter ionic bands at ~999, ~1117, and ~1631cm<SUP>-1</SUP> for NH<SUB>3</SUB><SUP>+</SUP> appeared to decrease presumably due to the deprotonation process at 373K. Our infrared spectroscopic study suggests that the deprotonated amino groups bind stronger, whereas the intra-carboxylate bonds become weaker as the temperature increase. Such structural changes of d-Pen Au NPs appeared to be reversible between 293 and 373K.
Hydrogen bonding-induced color recovery of gold nanoparticles upon conjugation of amino acids
Park, Jin-Ho,Ganbold, Erdene Ochir,Uuriintuya, Dembereldorj,Lee, Kangtaek,Joo, Sang-Woo The Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.47
<p>Hydrogen bonding-induced redispersion of the aggregated Au nanoparticles upon <I>N</I>-hydroxysuccinimide ester bioconjugations may provide a simple and colorimetric tool as an optical sensor to detect a trace amount of amino acids as low as ∼10<SUP>−6</SUP> M in an aqueous solution.</p> <P>Graphic Abstract</P><P>Redispersion of the aggregated Au nanoparticles induced by hydrogen bonding between the amide linkages may provide a useful optical sensor of the amino acid bioconjugations. <img src='http://pubs.rsc.org/ej/CC/2009/b918687e/b918687e-ga.gif'> </P>