• Bulletin of the Korean Chemical Society
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• v.35 no.2
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• pp.631-634
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• 2014

• Bulletin of the Korean Chemical Society
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• v.33 no.12
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• pp.4204-4206
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• 2012

• Bulletin of the Korean Chemical Society
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• v.30 no.10
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• pp.2446-2448
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• 2009

• Natural Product Sciences
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• v.4 no.2
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• pp.72-77
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• 1998

The new assay method was developed by using young chicks instead of frogs for screening of anti-emetic compounds from natural sources. Comparing with our previous method using leopard and ranid frogs, the advantages of the new method were not only completely parallel results but also decreasing standard errors. Hinesol and eudesmol were isolated from MeOH extract of Atractylodes lancea rhizome as the anti-emetic principles.

• Bulletin of the Korean Chemical Society
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• v.31 no.11
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• pp.3301-3303
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• 2010

Two new diterpenoid alkaloids, N(19)-en-denudatine (1) and N(4)-butanone-flavaconitine (2), were isolated from Aconitum brachypodum Diels.. Their structures were elucidated by comprehensive spectroscopic analyses including UV, IR, MS, 1D- and 2D-NMR.

• Natural Product Sciences
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• v.10 no.3
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• pp.96-98
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• 2004

From the flowers of Ervatamia coronaria four indole alkaloids have been isolated and characterized as harmine, heyneanine, voacristine and apparicine with the help of various spectral data. The alkaloids Harmine and Heyneanine are reported first time from the flowers of Ervatamia coronaria.

• Bulletin of the Korean Chemical Society
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• v.31 no.10
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• pp.3025-3026
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• 2010

• Natural Product Sciences
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• v.13 no.3
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• pp.186-189
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• 2007

The aerial parts of Verbascum sinaiticum Benth. (Scrophulariaceae) yielded two iridoids that were idenified as ajugol 3 and aucubin 4. Also, investigation of the flavonoid constituents revealed the isolation and identification of luteolin 1 and chrysoeriol-7-glucoside 2. All the isolated compounds were identifid by spectroscopicmethods (UV, MS, $^{1}H-NMR$ and $^{13}C-NMR$) and in comparison with the literature data. Both alcohol and methylene chloride/methanol extracts (1 : 1) exhibited a hepatoprotective effect by $CCl_{4}challenge$ test.

• Korean Journal of Soil Science and Fertilizer
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• v.46 no.6
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• pp.659-664
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• 2013

The aim of this study is to determine the drought stress index through photochemical analysis in red pepper (Capsiumannuum L.). The photochemical interpretation was performed in the basis of the relation between Kautsky effect and Photosystem II (PSII) following the measurement of chlorophyll, pheophytin contents, and $CO_2$ assimilation in drought stressed 5-week-old red pepper plants. The $CO_2$ assimilation rate was severely lowered with almost 77% reduction of chlorophyll and pheophytin contents at four days after non-irrigation. It was clearly observed that the chlorophyll fluorescence intensity rose from a minimum level (the O level), in less than one second, to a maximum level (the P-level) via two intermediate steps labeled J and I (OJIP process). Drought factor index (DFI) was also calculated using measured OJIP parameters. The DFI was -0.22, meaning not only the initial inhibition of PSII but also sequential inhibition of PSI. In real, most of all photochemical parameters such as quantum yield of the electron transport flux from Quinone A ($Q_A$) to Quinone B ($Q_B$), quantum yield of the electron transport flux until the PSI electron acceptors, quantum yield of the electron transport flux until the PSI electron acceptors, average absorbed photon flux per PSII reaction center, and electron transport flux until PSI acceptors per cross section were profoundly reduced except number of QA reducing reaction centers (RCs) per PSII antenna chlorophyll (RC/ABS). It was illuminated that at least 6 parameters related with quantum yield/efficiency and specific energy fluxes (per active PSII RC) could be applied to be used as the drought stress index. Furthermore, in the combination of parameters, driving forces (DF) for photochemical activity could be deduced from the performance index (PI) for energy conservation from photons absorbed by PSII antenna until the reduction of PSI acceptors. In conclusion, photochemical responses and their related parameters can be used as physiological DFI.

• Bulletin of the Korean Chemical Society
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• v.31 no.8
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• pp.2211-2214
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• 2010

The whole plant of Euphorbia helioscopia is an important traditional Chinese medicine. Fom its BuOH soluble extract, one new lactam (1), three new terpenoids (2-4) including a new naturally occurring compound, and three known compounds were isolated. Their structures were identified by spectroscopic evidences. In particular, the absolute configurations of side chain of compounds 1 and 2 were determined using computational methods.