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Wang Y.,Nanjing Southeast University | Wang Y.,Nanjing Xiaozhuang College | Cao J.,Nanjing Southeast University
Nonlinear Analysis: Real World Applications | Year: 2013

In the real world, many networks show community structure, i.e., clusters of nodes, which have a high density of links within the same cluster but a lower density of links between different clusters. In this paper, nonlinearly coupled networks with community structure and non-identical nodes and with time-varying delay are considered. By applying pinning control to a fraction of network nodes, and using a suitable Lyapunov function, we obtain some new and useful synchronization criteria, which guarantee that various clusters are synchronized independently. An example is presented to show the application of the criteria obtained in this paper. © 2012 Published by Elsevier Ltd.

Dong W.,Nanjing Normal University | Dong W.,Nanjing Xiaozhuang College | Xu B.,Nanjing Normal University
Information Processing Letters | Year: 2010

An acyclic edge coloring of a graph is a proper edge coloring without bichromatic cycles. The acyclic chromatic index of a graph G, denoted by α′(G), is the minimum number k such that G admits an acyclic edge coloring using k colors. Let G be a plane graph with maximum degree Δ and girth g. In this paper, we prove that α′(G)=Δ(G) if one of the following conditions holds: (1) Δ≥8 and g≥7; (2) Δ≥6 and g≥8; (3) Δ≥5 and g≥9; (4) Δ≥4 and g≥10; (5) Δ≥3 and g≥14. We also improve slightly a result of A. Fiedorowicz et al. (2008) [7] by showing that every triangle-free plane graph admits an acyclic edge coloring using at most Δ(G)+5 colors. © 2010 Elsevier B.V.

Fang X.,Nanjing Normal University | Han M.,Nanjing Normal University | Lu G.,Nanjing Xiaozhuang College | Tu W.,Nanjing Normal University | Dai Z.,Nanjing Normal University
Sensors and Actuators, B: Chemical | Year: 2012

A competitive immunosensor using CdSe quantum dots (QDs) as a label was highly proposed for the detection of a tumor marker. CdSe QDs were characterized by transmission electron microscope image, photoluminescence spectra and ultraviolet-visible absorption spectra. The fabrication process of the immunosensor was traced with electrochemical impedance spectra. Using α-fetoprotein (AFP) as a model, a simple electrochemiluminescence immunosensing platform based on CdSe QDs using competitive binding between conjugated antibody-CdSe QDs and free AFP with immobilized AFP on Au electrode was developed. Under the optimum conditions, the proposed electrochemiluminescence method could detect AFP ranging from 0.05 to 100 μg/L with a detection limit of 0.005 μg/L. The proposed immunosensor showed good analytical performance and was successfully applied to detecting level of AFP in human serum samples, which would provide a new and promising direction for clinical application. © 2012 Elsevier B.V.

Xu H.,Liaocheng University | Wang X.,Liaocheng University | Zhang C.,Nanjing Xiaozhuang College | Wu Y.,Liaocheng University | Liu Z.,Liaocheng University
Inorganic Chemistry Communications | Year: 2013

In this article, a new coumarin-hydrazone based Cu2+ fluorescence sensor (L2) has been prepared. The sensor displays a rapid and a linear response to Cu2+ with a 6-fold turn-off signal with a K a of 0.1 μM in aqueous solution. L2 also shows a highly selective fluorescence response to Cu2+ over other transition metal ions. The intracellular Cu2+ imaging ability on MCF-7 cells demonstrates that L2 is an effective Cu2+ imaging agent. © 2013 Elsevier B.V. All rights reserved.

Liu Z.,Nanjing University | Liu Z.,Liaocheng University | Zhang C.,Nanjing University | Zhang C.,Nanjing Xiaozhuang College | And 4 more authors.
Chemical Communications | Year: 2010

A ratiometric fluorescent Cd2+ sensor DBITA which featured the Cd2+-induced red-shift of emission (53 nm) and picomolar sensitivity in both aqueous media and living cells was developed. © 2010 The Royal Society of Chemistry.

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