26
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Li X, He Y, Ahn KI, Yang SI. Development of Fluorescent Turn-On Sensor for Selective Detection of Cu2+in Aqueous Solution. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.6.1871] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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27
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Lee CM, Cho EM, Ochir EG, Dembereldorj U, Yang SI. Chemotaxonomic Raman Spectroscopy Investigation of Ascomycetes and Zygomycetes. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.4.1240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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28
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Lee CM, Cho EM, Yang SI, Ganbold EO, Jun J, Cho KH. Raman Spectroscopy and Density Functional Theory Calculations of β-Glucans and Chitins in Fungal Cell Walls. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.3.943] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Kim YJ, Yang SI. Neurotoxic effects by silica TM nanoparticle is independent of differentiation of SH-SY5Y cells. Mol Cell Toxicol 2012. [DOI: 10.1007/s13273-011-0048-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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30
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Kim YJ, Yang SI, Ryu JC. Cytotoxicity and genotoxicity of nano-silver in mammalian cell lines. Mol Cell Toxicol 2010. [DOI: 10.1007/s13273-010-0018-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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Jeong YC, Gao C, Lee IS, Yang SI, Ahn KH. The considerable photostability improvement of photochromic terarylene by sulfone group. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.07.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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32
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Jeong YC, Park DG, Lee IS, Yang SI, Ahn KH. Highly fluorescent photochromic diarylethene with an excellent fatigue property. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b814040e] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Jeong YC, Kim SH, Ko H, Song K, Ahn KH, Yang SI. Photochromic optical memory based on non-destructive IR read-out. Photochem Photobiol Sci 2009; 8:1590-4. [DOI: 10.1039/b906891k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Yang SI, Kim KH, Kang D, Joo SW. Cis-to-trans photoconversion of azobenzene self-assembled monolayers on gold nanoparticle surfaces investigated by Raman spectroscopy. Photochem Photobiol Sci 2009; 8:31-3. [DOI: 10.1039/b808903e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Kwon JS, Jeon HB, Yang SI, Oh JJ, Joo SW. Adsorption of (S)–(+)–O-acetylmandelic acid on gold nanoparticle surfaces investigated by surface-enhanced Raman scattering. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Jeong YC, Han JP, Kim Y, Kim E, Yang SI, Ahn KH. Characterization and photophysical properties of sulfur-oxidized diarylethenes. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.02.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Jeong YC, Yang SI, Kim E, Ahn KH. A High-Content Diarylethene Photochromic Polymer for an Efficient Fluorescence Modulation. Macromol Rapid Commun 2006. [DOI: 10.1002/marc.200600461] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Jeong YC, Park DG, Kim E, Ahn KH, Yang SI. Fatigue-resistant photochromic dithienylethenes by controlling the oxidation state. Chem Commun (Camb) 2006:1881-3. [PMID: 16622516 DOI: 10.1039/b600754f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High fatigue-resistant photochromic dithienylethenes were synthesized by controlling the oxidation state of 1,2-bis(2-methyl-1-benzothiophene-3-yl)perfluorocyclopentene (BTF6) and 1,2-bis(2,5-dimethylthien-3-yl)perfluorocyclopentene (DMTF6).
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39
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Jeong YC, Yang SI, Ahn KH, Kim E. Highly fluorescent photochromic diarylethene in the closed-ring form. Chem Commun (Camb) 2005:2503-5. [PMID: 15886785 DOI: 10.1039/b501324k] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly fluorescent diarylethene in the closed-ring form was synthesized by the oxidation of 1,2-bis(2-methyl-1-benzothiophene-3-yl)perfluorocyclopentene (BTF6).
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Cho HS, Ahn TK, Yang SI, Jin SM, Kim D, Kim SK, Kim HD. Singlet excited state (S1) of higher fullerenes C76 and C84: correlation between lifetime and HOMO–LUMO energy gap. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00845-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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41
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Kirmaier C, Yang SI, Prathapan S, Miller MA, Diers JR, Bocian DF, Lindsey JS, Holten D. Synthesis and excited-state photodynamics of perylene-porphyrin dyads. 4. Ultrafast charge separation and charge recombination between tightly coupled units in polar media. RESEARCH ON CHEMICAL INTERMEDIATES 2002. [DOI: 10.1163/15685670260469384] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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42
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Powers ET, Yang SI, Lieber CM, Kelly JW. Ordered Langmuir-Blodgett films of amphiphilic beta-hairpin peptides imaged by atomic force microscopy. Angew Chem Int Ed Engl 2002; 41:127-30. [PMID: 12491460 DOI: 10.1002/1521-3773(20020104)41:1<127::aid-anie127>3.0.co;2-f] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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43
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Powers ET, Yang SI, Lieber CM, Kelly JW. Ordered Langmuir-Blodgett Films of Amphiphilicβ-Hairpin Peptides Imaged by Atomic Force Microscopy. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020104)114:1<135::aid-ange135>3.0.co;2-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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44
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Lee H, Lee J, Yang SI. Synthesis and in vitro cytotoxicity of 4-alkyl- or 4-arylaminosubstituted cyclopenta[c]quinoline derivatives. Arch Pharm Res 2001; 24:385-9. [PMID: 11693536 DOI: 10.1007/bf02975180] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Twelve 4-substituted cyclopenta[c]quinoline derivatives were synthesized and evaluated in vitro cytotoxicity against four human cancer cell lines (HOP62, SK-OV-3, MD-MB-468 and T-47D). The compounds 6c and 6e bearing p-anisidine and pyrrolidine side chain were more active than the others.
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Yang SI, Prathapan S, Miller MA, Seth J, Bocian DF, Lindsey JS, Holten D. Synthesis and Excited-State Photodynamics in Perylene-Porphyrin Dyads 2. Effects of Porphyrin Metalation State on the Energy-Transfer, Charge-Transfer, and Deactivation Channels. J Phys Chem B 2001. [DOI: 10.1021/jp010336a] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Prathapan S, Yang SI, Seth J, Miller MA, Bocian DF, Holten D, Lindsey JS. Synthesis and Excited-State Photodynamics of Perylene−Porphyrin Dyads. 1. Parallel Energy and Charge Transfer via a Diphenylethyne Linker. J Phys Chem B 2001. [DOI: 10.1021/jp010335i] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Ik Yang S, Lammi RK, Prathapan S, Miller MA, Seth J, Diers JR, Bocian DF, Lindsey JS, Holten D. Synthesis and excited-state photodynamics of perylene–porphyrin dyads Part 3. Effects of perylene, linker, and connectivity on ultrafast energy transfer. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b102741g] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Bang OS, Park EK, Yang SI, Lee SR, Franke TF, Kang SS. Overexpression of Akt inhibits NGF-induced growth arrest and neuronal differentiation of PC12 cells. J Cell Sci 2001; 114:81-88. [PMID: 11112692 DOI: 10.1242/jcs.114.1.81] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
To investigate the role of Akt in nerve growth factor (NGF)-induced neuronal differentiation, PC12 cells ectopically expressing wild-type or dominant-inhibitory forms of Akt were analyzed. NGF-induced neurite outgrowth was greatly accelerated in cells expressing dominant-inhibitory Akt, compared to parental PC12 cells, but was almost completely blocked in cells expressing wild-type Akt. Since neuronal differentiation requires an arrest of cell growth, several aspects of cell growth of the different cell lines were compared. Cells expressing wild-type Akt were not susceptible to the growth-arresting effect of NGF, whereas parental PC12 cells and notably cells expressing mutant Akt were so affected. Accompanying this, the expressions of CDKs and p21(WAF1) were down- and up-regulated, respectively, in both parental PC12 cells and cells expressing mutant Akt. When treated with some growth arrest-inducing agents such as sodium nitroprusside, forskolin and butyrolactone I, cells expressing wild-type Akt regained their responsiveness to the effects of NGF on differentiation. In summary, our results indicate that Akt overrides the growth-arresting effect of NGF and thereby, negatively regulates neuronal differentiation.
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Lee H, Lee J, Hong SS, Yang SI, Jung SH, Jahng Y, Cho J. Synthesis and in vitro cytotoxicity of 2-alkylaminosubstituted quinoline derivatives. Arch Pharm Res 2000; 23:450-4. [PMID: 11059821 DOI: 10.1007/bf02976570] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Eight 2-alkylaminosubstituted 5,8-dimethoxy-4-methylquinolines and nine 2-alkylaminosubstituted or 2,6-disubstituted 4-methylquinoline-5,8-diones were synthesized and evaluated in vitro cytotoxicity against four human cancer cell lines (HOP62, SK-OV-3, HCT15 and SF295).
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Mo HJ, Lee HC, Choi HS, Yang SI. Heat shock-induced, caspase-3-independent rapid breakdown of Akt and consequent alteration of its total phosphorylation/activity level. Biochem Biophys Res Commun 2000; 276:702-6. [PMID: 11027534 DOI: 10.1006/bbrc.2000.3524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The immediate effect of a 15-min heat shock was examined on the level and the activity of Akt. Following heat shock, the Akt level decreased by 15-70% in a temperature-dependent and phosphorylation status-independent manner. This decrease of Akt level was not prevented by caspase inhibitors. At 48 degrees C, the extent of the breakdown was so immense that the total phosphorylation/activity level of Akt was not increased over the control level, implying that the total cellular activity of Akt governed by the level and the molar activity does not necessarily undergo the ensuing change.
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