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Ruqian Cao,Aye Aye Myint,김재훈 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Red ginseng marc (RGM), a byproduct obtained during manufacturing various ginseng products, which istypically discarded as waste, contains numerous residual bioactive compounds. However, the recovery ofbioactive compounds, including transformed ginsenosides, from RGM using conventional extractiontechniques is difficult. In this study, subcritical water was used for a quick and high-yield extraction ofthe bioactive compounds in RGM. Furthermore, the chemical species and antioxidant activities of theextracts were analyzed. Extraction was performed in the temperature range and duration of 140–200 C and 15–90 min, respectively, to determine the optimal conditions for achieving the highest extractionyield and bioactivity. Under the optimized conditions (200 C and 15 min), an extraction yield of48 wt% was achieved, which was 1.8 and 4.1 times higher than those achieved via Soxhlet extraction withwater and 80% ethanol, respectively (8 h). In addition, the antioxidant activity of the subcritical waterextract was 2.7–78.7 times and 2.8–9.8 times higher than those of the extracts obtained using theSoxhlet method with water and 80% ethanol, respectively. The total ginsenoside content of the extractwas 30 mg/g, and G-Rf, a transformed ginsenoside, was the primary component of the extract.
Kim, Jeongwoo,Jhi, Seung-Hoon,Wu, Ruqian American Chemical Society 2016 NANO LETTERS Vol.16 No.10
<P>The tailoring, of topological surface states in topological insulators is essential for device applications and for exploring new topological phase. Here, we propose a practical way to induce the quantum anomalous Hall phase and unusual metal-insulator transitions in Cr-doped Bi2Se3 films based on the model Hamiltonian and first-principles calculations. Using the combination of in-plane and plane-normal components of the spin, along with external electric fields, we demonstrate that the topological state and band structures of topological insulating films exhibit rich features such as the shift of Dirge cones and the opening of nontrivial band gaps. We also show that: the in-plane magnetization leads to significant suppression,of inter-TSS scattering in Cr-doped Bi2Se3. Our work provides new strategies to obtain the desired electronic structures for the device, complementary to the-efforts of an extensive material search.</P>
Ni, Y.,Lu, L.,Chen, J.,Zhao, Ruqian Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.9
Sexual maturity in poultry is controlled by a complex neural circuit located in the basal forebrain, which integrates the central and peripheral signals to activate hypothalamic gonadotrophin-releasing hormone (GnRH) secretion. This study demonstrated the changes of GnRH-I, POMC and NPY mRNA transcription in hypothalamus and IGF-I and leptin levels in serum of Shaoxing ducks during puberty. Body weight increased progressively from d30 to d120 and at d120 the flock reached 5% of laying rate. A significant upregulation of hypothalamic GnRH-I mRNA expression was observed from d60, reaching the peak at d120. POMC and NPY mRNA expression in hypothalamus showed a similar pattern, which increased from d30 to d60, followed by a significant decrease towards sexual maturity. Serum IGF-I levels exhibited two peaks at d30 and d120, respectively. Serum leptin displayed a single peak at d90. The results indicate that the down-regulation of POMC and NPY genes in hypothalamus coincides with the up-regulation of GnRH-I gene to initiate sexual maturation in ducks. In addition, peripheral IGF-I and leptin may relay the peripheral metabolic status to the central system and contribute to the initiation of the reproductive function in ducks.
Kim, Jinwoong,Kim, Jeongwoo,Song, Young-Sun,Wu, Ruqian,Jhi, Seung-Hoon,Kioussis, Nicholas American Physical Society 2017 Physical review. B Vol.96 No.23
<P>The interfacial phase-change memory (iPCM) GeTe/Sb2Te3, a promising candidate for the next generation nonvolatile random-accessmemories, exhibits fascinating topological properties. Depending on the atomic-layerstacking sequence of the GeTe block, the iPCM can be either in the SET (Ge-Te-Ge-Te) or RESET (Te-Ge-Ge-Te) states, where the former exhibits ferroelectric polarization and electrical conductivity two orders of magnitude larger than that of the RESET state. Yet, its microscopic origin remains elusive. Here, we predict the emergence of a Weyl semimetal phase in the SET state induced by the ferroelectric polarization which breaks the crystal inversion symmetry. We show that the giant conductivity enhancement of the SET phase is due to the appearance of gapless Weyl nodes. The Ge-Te-or Sb-Te-terminated surfaces of Weyl semimetal iPCM exhibit surface states with completely distinctive topology, where the former consists solely of Fermi arcs while the latter consists of both closed Fermi surface and open Fermi arcs. The iPCM with van der Waals interfaces offers an ideal platform for exploiting the exotic Weyl properties as well as for future memory device applications.</P>
Ordering mechanism and quantum anomalous Hall effect of magnetically doped topological insulators
Kim, Jeongwoo,Jhi, Seung-Hoon,MacDonald, A. H.,Wu, Ruqian American Physical Society 2017 Physical Review B Vol.96 No.14
<P>We investigate magnetic ordering and the quantum anomalous Hall effect (QAHE) in Cr-doped topological insulators using systematic first-principles calculations, explaining the mechanism responsible for ferromagnetic order and the reason why Sb2Te3 is a better QAHE host than Bi2Se3 or Bi2Te3. We conclude that these magnetic topological insulators have relatively long-range exchange interactions within quintuple layers and weak interactions between quintuple layers. Our analyses for the spin splitting of the topological surface states suggest that the temperature at which the QAHE occurs in these materials can be enhanced significantly by Mo-Cr co-doping.</P>