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STABILITY AND BIFURCATION ANALYSIS FOR A TWO-COMPETITOR/ONE-PREY SYSTEM WITH TWO DELAYS
Guo-Hu Cui,Xiang-Ping Yan 대한수학회 2011 대한수학회지 Vol.48 No.6
The present paper is concerned with a two-competitor/one-prey population system with Holling type-II functional response and two discrete delays. By linearizing the system at the positive equilibrium and analyzing the associated characteristic equation, the asymptotic stability of the positive equilibrium and existence of local Hopf bifurcations are investigated. Particularly, by applying the normal form theory and the center manifold reduction for functional differential equations (FDEs),explicit formulae determining the direction of bifurcations and the sta-bility of bifurcating periodic solutions are derived. Finally, to verify our theoretical predictions, some numerical simulations are also included at the end of this paper.
STABILITY AND BIFURCATION ANALYSIS FOR A TWO-COMPETITOR/ONE-PREY SYSTEM WITH TWO DELAYS
Cui, Guo-Hu,Yany, Xiang-Ping Korean Mathematical Society 2011 대한수학회지 Vol.48 No.6
The present paper is concerned with a two-competitor/oneprey population system with Holling type-II functional response and two discrete delays. By linearizing the system at the positive equilibrium and analyzing the associated characteristic equation, the asymptotic stability of the positive equilibrium and existence of local Hopf bifurcations are investigated. Particularly, by applying the normal form theory and the center manifold reduction for functional differential equations (FDEs) explicit formulae determining the direction of bifurcations and the stability of bifurcating periodic solutions are derived. Finally, to verify our theoretical predictions, some numerical simulations are also included at the end of this paper.
Cui Guo,Ran Lu,Xin Wang,Su Chen 한국고분자학회 2021 Macromolecular Research Vol.29 No.5
Polyetheretherketone (PEEK) implant abutments are widely used in implant dentistry; however, they do not protect the implant against infections. We demonstrated that graphene oxide (GO) coating enhances the integration between implant surfaces and gingival tissues, which is crucial for peri-implant health. The GO coating was tightly fixed onto the PEEK surface by doping with dopamine which is self-polymerized into poly-dopamine (PDA). The in vitro study included antimicrobial and cellular tests. It revealed the inhibition of bacteria like Porphyromonas gingivalis (P. gingivalis), Fusobacterium nucleatum (F. nucleatum), and Streptococcus mutans (S. mutans). Moreover, it exhibited good adhesion and proliferation of human gingival fibroblasts (HGFs). Our results revealed that the PEEK-PDA-GO coating resisted bacteria and protected soft tissues against peri-implant complications.
Short Note on Optimizing Feature Selection to Improve Medical Diagnosis
Cui Guo,Hong Seo Ryoo 한국경영과학회 2014 韓國經營科學會誌 Vol.39 No.4
A new classification framework called ‘support feature machine’ was introduced in [2] for analyzing medical data. Contrary to authors’ claim, however, the proposed method is not designed to guarantee minimizing the use of the spatial feature variables. This paper mathematically remedies this drawback and provides comments on models from[2].
Research on Aggregation and Propagation of Self-Similar Traffic in Satellite Network
Zhenyu Na,Yi Liu,Yang Cui,Qing Guo 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.1
It has already been confirmed that the traffic in high-speed terrestrial network presents self-similarity, but there is little research on self-similarity of traffic in satellite network. Considering time-varying network topology and link status, this paper analyzes the aggregation and propagation of self-similar traffic between nodes in satellite network. Furthermore, a sort of special network node called ground gateway is modeled, based on which the characteristics of the output traffic that the input traffic from terrestrial network passes gateway into satellite network are analyzed. Theoretically analyses demonstrate that after aggregation and propagation between satellite nodes, traffic is still self-similar, and the self-similarity of the output traffic generated by gateway from terrestrial network to satellite network is more often than not weakened.
Guo, Jing,Shin, Kyung-Tae,Cui, Xiang-Shun Cambridge University Press 2017 Microscopy and Microanalysis Vol.23 No.1
<B>Abstract</B><P>Cyclin E1 (CCNE1) is a core component of cell cycle regulation that drives the transition into the S phase. CCNE1 plays critical roles in cell cycle, cell proliferation, and cellular functions. However, the function of CCNE1 in early embryonic development is limited. In the present study, the function and expression of <I>Ccne1</I> in porcine early parthenotes were examined. Immunostaining experiments showed that CCNE1 localized in the nucleus, starting at the four-cell stage. Knockdown of <I>Ccne1</I> by double-stranded RNA resulted in the failure of blastocyst formation and induced blastocyst apoptosis. <I>Ccne1</I> depletion increased expression of the pro-apoptotic gene <I>Bax</I>, and decreased the expression of <I>Oct4</I> and the rate of inner cell mass (ICM)/trophectoderm formation. The results indicated that CCNE1 affects blastocyst formation by inducing cell apoptosis and ICM formation during porcine embryonic development.</P>
Upregulation of MicroRNA 181c Expression in Gastric Cancer Tissues and Plasma
Cui, Mei-Hua,Hou, Xiao-Lin,Lei, Xiao-Yan,Mu, Fang-Hong,Yang, Gui-Bin,Yue, Lin,Fu, Yi,Yi, Guo-Xing Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
Objective: To test the microRNA-181c (miR-181c) expression in tissues and plasma of gastric cancer (GC) cases, analyze any correlations, and explore the possibility of miR-181c as a potential molecular marker for GC diagnosis. Materials and Methods: Relative miR-181c expression levels in cancers and plasma from 30 GC patients was tested using reverse transcription-real-time fluorescent quantitation PCR and compared to that in samples from 30 gastric ulcer and 30 chronic gastritis patients. Results: The miR-181c expression level in the GC tissues was significantly higher than that in the gastric ulcer and chronic gastritis tissues (P = 0.000), as was the miR-181c expression level in the GC plasma (P = 0.000). We determined that miR-181c expression in GC plasma was positively correlated to its expression in the GC tissues (P = 0.000). Conclusions: The expression of miR-181c is upregulated in GC tissues and plasma, and the miR-181c expression level in GC plasma is positively correlated to that in the corresponding cancer tissues. Plasma miR-181c is possibly a new serological marker for GC diagnosis.
The Phylotype of Thermus from the Rehai Geothermal Area, Tengchong, China
Guo, Chunlei,Wang, Tao,Zhu, Wei,Zhang, Donghua,Cui, Xiaolong,Xu, Lihua,Peng, Qian The Microbiological Society of Korea 2003 The journal of microbiology Vol.41 No.2
Through enrichment on two nutrient agars, 57 Thermus isolates were recovered from 15 hot spring samples taken from the Rehai geothermal area, Tengchong, China. Unique growth characteristics were observed when the strains were transferred from YIM14 medium to Thermus medium. Phylogenetic analysis showed that the 16S rDNA sequences of the isolates and clones from the Rehai geothermal area farmed a monophyletic group on the phylogenetic tree. A secondary structure comparison showed that their 16S rRNAs have unique secondary structure characteristics.
Guo, Wei-Qiang,Li, Liang-Zhi,He, Zhuo-Yang,Zhang, Qi,Liu, Jia,Hu, Cui-Ying,Qin, Fen-Ju,Wang, Tao-Yun Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Atractylis lancea (Thunb.) DC. (AL), an important medicinal herb in Asia, has been shown to have anti-tumor effects on cancer cells, but the involved mechanisms are poorly understood. This study focused on potential effects and molecular mechanisms of AL on the proliferation of the Hep-G2 liver cancer cell line in vitro. Cell viability was assessed by MTT test in Hep-G2 cells incubated with an ethanol extract of AL. Then, the effects of AL on apoptosis and cell cycle progression were determined by flow cytometry. Telomeric repeat amplification protocol (TRAP) assays was performed to investigate telomerase activity. The mRNA and protein expression of human telomerase reverse transcriptase (hTERT) and c-myc were determined by real-time RT-PCR and Western blotting. Our results show that AL effectively inhibits proliferation in Hep-G2 cells in a concentrationand time-dependent manner. When Hep-G2 cells were treated with AL after 48h,the $IC_{50}$ was about 72.1 ${\mu}g/mL$. Apoptosis was induced by AL via arresting the cells in the G1 phase. Furthermore, AL effectively reduced telomerase activity through inhibition of mRNA and protein expression of hTERT and c-myc. Hence, these data demonstrate that AL exerts anti-proliferative effects in Hep-G2 cells via down-regulation of the c-myc/hTERT/telomerase pathway.