Linyi Normal University
Linyi, China

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Lu W.-T.,Linyi Normal University
Applied Physics Letters | Year: 2014

We study resonant tunneling through a magnetic barrier structure in graphene, on the basis of Fabry-Pérot interference effect. For parallel structure, the Fabry-Pérot resonance displays symmetric distribution in (E, ky) space, and the transmission range is shrunk rapidly with the increased magnetic barrier or period number. For antiparallel structure, there exists a complex resonant tunneling caused by the combined effect of Fabry-Pérot resonance and line-type resonance, which are related to resonant states in the vector potential barriers and wells, respectively. Such a transmission difference leads to a giant magnetoresistance ratio which can be effectively controlled by adjusting the magnetic field. © 2014 AIP Publishing LLC.

The solubility of 6-chloro-3-aminopyridazine in water and (water + ethanol) binary system was measured from 293.55 K to 342.95 K using a synthetic method. The fusion point temperature and enthalpy of fusion were determined by differential scanning calorimetry. The experimental solubility data were regressed by modified Apelblat, λh and polynomial empirical equations. Apelblat and empirical polynomial equations are in good agreement with all experimental data with the root-mean-square deviation being less than 1.69%. In addition, the activity coefficients and molar enthalpy of dissolution 6-chloro-3-aminopyridazine were obtained. © 2013 Published by Elsevier B.V.

The solubility of 2,4-dichlorophenoxyacetic acid in toluene, tetrachloromethane and the binary solvent mixtures of (cyclohexane + ethyl acetate) was determined from 293.15 K to 341.05 K using a synthetic method. Modified Apelblat and polynomial empirical equations were proposed to correlate the experimental solubility data. The fusion point temperature and enthalpy of fusion were determined by DSC. In addition, activity coefficients of 2, 4-dichlorophenoxyacetic acid, enthalpies of dissolution of the resulting solutions were estimated. © 2013 Elsevier B.V. All rights reserved.

He P.,Qingdao University of Science and Technology | Liu L.,Qingdao University of Science and Technology | Qiao W.,Qingdao University of Science and Technology | Zhang S.,Linyi Normal University
Chemical Communications | Year: 2014

The surface plasmon resonance (SPR) and quartz crystal microbalance (QCM) aptasensors combined with rolling circle amplification and bio-bar-coded AuNP enhancement have been applied to detect the human α-thrombin for the first time. The assay platform exhibited excellent selectivity and sensitivity with detection limit as low as 0.78 aM. This journal is © The Royal Society of Chemistry.

Ma Z.M.,Wuhan University | Ma Z.M.,Linyi Normal University | Hu B.Q.,Wuhan University
Information Sciences | Year: 2013

This paper builds the topological and lattice structures of L-fuzzy rough sets by introducing lower and upper sets. In particular, it is shown that when the L-relation is reflexive, the upper (resp. lower) set is equivalent to the lower (resp. upper) L-fuzzy approximation set. Then by the upper (resp. lower) set, it is indicated that an L-preorder is the equivalence condition under which the set of all the lower (resp. upper) L-fuzzy approximation sets and the Alexandrov L-topology are identical. However, associating with an L-preorder, the equivalence condition that L-interior (resp. closure) operator accords with the lower (resp. upper) L-fuzzy approximation operator is investigated. At last, it is proven that the set of all the lower (resp. upper) L-fuzzy approximation sets forms a complete lattice when the L-relation is reflexive. © 2012 Published by Elsevier Inc. All rights reserved.

Yingkui L.,Linyi Normal University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

In this paper, we report the synthesis, characterization, crystal structure, and photophysical properties of a Eu3+ complex of Eu(TTA)3Phen, where TTA = 2-thenoyltrifluoroacetonate, and Phen = 1,10-phenanthroline. Its elementary application for oxygen-sensing application is also investigated by doping it into a polymer matrix of polystyrene (PS). Experimental data suggest that the 3 wt% doped Eu(TTA)3Phen nanofibrous membrane exhibits a high sensitivity of 3.4 towards oxygen with a good linear relationship of R2 = 0.996. In addition, the 3 wt% doped Eu(TTA)3Phen nanofibrous membrane owns a quick response of 9 s towards molecular oxygen, along with its excellent atmosphere insensitivity and photobleaching resistance. All these results suggest that both Eu(TTA) 3Phen and Eu(TTA)3Phen/PS system are promising candidates for oxygen-sensing optical sensors. © 2011 Elsevier B.V.

Molecularly imprinted polymer coated quantum dot (MIP@QD) fluorescence sensors combined with ratiometric fluorescence techniques and mesoporous silica materials have been applied to detect TNT for the first time. The assay platform exhibited excellent selectivity and sensitivity with a detection limit as low as 15 nM. This journal is © The Royal Society of Chemistry 2015.

An ultrasensitive and highly selective method for polymerase chain reaction-free (PCR-free) messenger RNA (mRNA) expression profiling is developed through a novel cross-rolling circle amplification (C-RCA) process based on DNA-rotaxane nanostructures. Two species of DNA pseudorotaxane (DPR) superstructures (DPR-I and DPR-II) are assembled by threading a linear DNA rod through a double-stranded DNA (dsDNA) ring containing two single-stranded gaps. In this assay, cDNA that is specific for β-actin (ACTB) mRNA is taken as a model analyte. Upon the introduction of the target cDNA, the cDNA and the biotin-modified primer are hybridized to the single-stranded regions of the DNA rod and the gap-ring, respectively. As a result, the DPR-I dethreads into free DNA macrocycle and a dumbbell-shaped DNA nanostructure. In the presence of DNA polymerase/dNTPs, two release-DNA on the DPR-I are replaced by polymerase with strand-displacement activity, which can act as the input of the DPR-II to trigger the dethreading of DPR-II and the RCA reaction, releasing another two specified release-DNA strands those in turn serve as the "mimic cDNA" for DPR-I. The C-RCA reaction then proceeds autonomously. To overcome the high background induced by hemin itself, the biotinylated rolling circle products are captured by streptavidin-coated MNPs, achieving a detection limit as low as 0.1 zmol cDNA. The assay also exhibits an excellent selectivity due to its unique DNA nanostructure fabricated through base pairing hybridization. The ACTB mRNA expression in mammary cancer cells (MCF-7) is successfully detected.

Using the usual mean-field theory approximation, the critical behaviour (i.e. the Curie temperature Tc and the critical surface transverse field Ω sc) in a multiple-surface-layer ferroelectric thin film is studied on the basis of the spin- transverse Ising model. The dependence of the Curie temperature Tc on the surface transverse field Ω s and the surface layer number Ns are discussed in detail. Meanwhile the dependence of the critical surface transverse field Ω sc on the surface layer number Ns is also examined. The numerical results indicate that the critical behaviour of ferroelectric thin films is obviously affected by modifications of the surface transverse field Ω s and surface layer number Ns. © 2013 The Royal Swedish Academy of Sciences.

Dynamics of lipid bodies and plastids in chili pepper fruits during ripening were investigated by means of transmission electron microscopy. Mesocarp of chili pepper fruits consists of collenchyma, normal parenchyma, and huge celled parenchyma. In mature green fruits, plastids contain numerous thylakoids that are well organized into grana in collenchyma, a strikingly huge amount of starch and irregularly organized thylakoids in normal parenchyma, and simple tubes rather than thylakoids in huge celled parenchyma. These morphological features suggest that plastids are chloroplasts in collenchyma, chloroamyloplasts in normal parenchyma, proplastids in huge celled parenchyma. As fruits ripen to red, plastids in all cell types convert to chromoplasts and, concomitantly, lipid bodies accumulate in both cytoplasm and chromoplasts. Cytosolic lipid bodies are lined up in a regular layer adjacent to plasma membrane. The cytosolic lipid body consists of a core surrounded by a membrane. The core is comprised of a more electron-dense central part enclosed by a slightly less electron-dense peripheral layer. Plastidial lipid bodies in collenchyma, normal parenchyma, and endodermis initiate as plastoglobuli, which in turn convert to rod-like structures. Therefore, plastidial lipid bodies are more dynamic than cytosolic lipid bodies. Both cytosolic and plastidial lipid bodies contain rich unsaturated lipids. © 2012 Elsevier Ltd.

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