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RISS 인기검색어
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- 저자 : Zhongkai Zhou (검색결과 3 건)
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ARPES study of the epitaxially grown topological crystalline insulator SnTe(111)
Zhang, Yi,Liu, Zhongkai,Zhou, Bo,Kim, Yeongkwan,Yang, Lexian,Ryu, Hyejin,Hwang, Choongyu,Chen, Yulin,Hussain, Zahid,Shen, Zhi-Xun,Mo, Sung-Kwan Elsevier 2017 Journal of electron spectroscopy and related pheno Vol.219 No.-
<P><B>Abstract</B></P> <P>SnTe is a prototypical topological crystalline insulator, in which the gapless surface state is protected by a crystal symmetry. The hallmark of the topological properties in SnTe is the Dirac cones projected to the surfaces with mirror symmetry, stemming from the band inversion near the L points of its bulk Brillouin zone, which can be measured by angle-resolved photoemission. We have obtained the (111) surface of SnTe film by molecular beam epitaxy on BaF<SUB>2</SUB>(111) substrate. Photon-energy-dependence of <I>in situ</I> angle-resolved photoemission, covering multiple Brillouin zones in the direction perpendicular to the (111) surface, demonstrate the projected Dirac cones at the Γ ¯ and M ¯ points of the surface Brillouin zone. In addition, we observe a Dirac-cone-like band structure at the Γ point of the bulk Brillouin zone, whose Dirac energy is largely different from those at the Γ ¯ and M ¯ points.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Topological crystalline insulator SnTe(111) thin film was grown on BaF<SUB>2</SUB>(111) substrate by using molecular beam epitaxy. </LI> <LI> The electronic structures of SnTe(111) with surface Dirac cones were studied by a wide-range photon-energy-dependent angle-resolved photoemission spectroscopy. </LI> <LI> A Dirac-cone-like band structure was observed at the Γ point of the bulk Brillouin zone of SnTe(111). </LI> </UL> </P>
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Yumei Jiang,Na Zhang,Yawen Zhou,Zhongkai Zhou,Yu Bai,Padraig Strappe,Chris Blanchard 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.5
Our team previously demonstrated that Ganodermalucidum spores (GLS) and resistant starch (RS) hadhypoglycemic effects separately on type 2 diabetic mellitus(T2DM) rats. This work was to explore the effects ofadministering encapsulated GLS within RS (referred to asEGLS) in the T2DM rats, which were induced by streptozotocin(STZ). The EGLS was orally administered torats for 28 days. The parameters of glycometabolismand lipometabolism were evaluated, and fecal microbiotacomposition was investigated. The results showed thatEGLS significantly enhanced glycometabolism and lipometabolismparameters in T2DM rats, which might beassociate with the enhancement of the glucose and lipidmetabolism, insulin secretion, and glycogen synthesis andreduced lipogenesis. Furthermore, the intervention ofEGLS also reduced the Proteobacteria community andimproved dysfunctional gut microbiota. This study indicatedEGLS may be a potential candidate for dietaryintervention to modulate diabetes.
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Rui Yang,Yuqian Liu,Jingjing Xu,Wenting Shang,Xiaoyuan Zhang,Yongjin Wang,Chris Blanchard,Zhongkai Zhou 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.6
Epigallocatechin gallate (EGCG) is sensitive to heat thus its application in food industry is limited. In this work, rice bran albumin protein (RAP) was used as a carrier for EGCG. RAP-EGCG complexes (RAPE) were prepared with the binding number n of 0.0505:1 (EGCG: RAP, w/w) and binding constant K of (0.74 ± 0.002) 9 104 M-1, which suggests that hydrogen bond/van der Waals forces played important roles in such binding. FTIR analysis demonstrated that EGCG could induce the secondary structure changes of RAP above the ratio of 1.92:1 (EGCG:RAP, w/w). Dynamic light scattering and scanning electron microscope results showed that EGCG could trigger RAP association. Furthermore, the EGCG stability in RAPE was significantly improved than that of free EGCG in 10–60 C. The antioxidant ability of EGCG in RAPE was partially retained. These findings prove that RAP is a potential carrier for polyphenols and is beneficial for mechanism investigation between protein and polyphenols.
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