Anhui Normal University
Wuhu, China

Anhui Normal University is an institution of higher learning in Wuhu, Anhui Province of the People's Republic of China.Approved by the State Council in 1972, it was officially renamed Anhui Normal University, and the name was written by Guo Moruo.Anhui Normal University is the only university in Wuhu to accept foreign students. The College of International Education usually has over 150 foreign students of many different nationalities including Cuban, British, French, German, Egyptian, Korean, Vietnamese, Thai, Yemenese, Japanese, Russian, pakistan etc. Wikipedia.

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Zhuo S.,Soochow University of China | Zhuo S.,Anhui Normal University | Shao M.,Soochow University of China | Lee S.-T.,City University of Hong Kong
ACS Nano | Year: 2012

A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO 2/GQD and anatase TiO 2/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO 2/GQD complex system is ca. 9 times larger than that of the anatase TiO 2/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue. © 2012 American Chemical Society.

A new luminescence resonant energy transfer (LRET) system has been designed that utilizes near-infrared (NIR)-to-NIR upconversion lanthanide nanophosphors (UCNPs) as the donor, and Au nanorods (Au NRs) as the acceptor. The UCNPs were excited by a near-infrared (980 nm) wavelength and also emitted at a near-infrared wavelength (804 nm) using an inexpensive infrared continuous wave laser diode. The Au NRs showed a high absorption band around 806 nm, which provided large spectral overlap between the donor and the acceptor. Hg(2+) ions were added to an aqueous solution containing the UCNPs and Au NRs that were modified with a Hg(2+) aptamer. Then, a sandwich-type LRET system was developed for the detection of Hg(2+) ions that had high sensitivity and selectivity in the NIR region. The method was successfully applied to the sensing of Hg(2+) ions in water and human serum samples.

A quartz crystal microbalance (QCM) biosensor for theophylline was developed by recognition of RNA aptamer and gold nanoparticle amplification technique. Firstly, a designed small single-stranded RNA, RNA1, was immobilized onto the QCM electrode through a thiol linker. Then, the complementary stranded RNA2, which can combine with RNA1 to form a double-stranded RNA with a recognition unit of theophylline, could be self-assembled on the QCM electrode surface through a hybrid reaction in the presence of theophylline. The recognition process could cause a frequency change of QCM to give the signal related to theophylline. When RNA2 was tethered to gold nanoparticles, the signal could be amplified to further enhance the sensitivity of the designed sensor. Under the optimal conditions, the QCM-based biosensor showed excellent sensitivity (limit of detection, 8.2 nM) and specificity with a dissociation constant of Kd = 5.26 × 10(-7) M. The sensor can be used to quantitatively detect theophylline in serum, suggesting that it can be applied in complex biological samples.

Xia Y.,Anhui Normal University | Tang Z.,CAS National Center for Nanoscience and Technology
Advanced Functional Materials | Year: 2012

A novel and general strategy to fabricate monodisperse hollow supraparticles (SPs) via selective chemical oxidation is developed. Core-shell SPs made of semiconductor nanocrystals (NCs) are first obtained by an in situ assembly method. Subsequently, the cores can be selectively removed by preferential oxidation with dilute H 2O 2, resulting in formation of monodisperse hollow SPs. The structural parameters of the products, such as size, shell thickness, and composition, are tailored easily. The hollow structures achieved from CdSe/CdS core-shell SPs possess high fluorescence quantum yields and a large Stokes shift, the latter is remarkably different from that of conventional organic dyes and quantum dots. In addition to simple hollow structures, rattle-type nanostructures composed of semiconductor SPs or noble metal-semiconductor hybrids are also prepared, exemplifying the versatility of the proposed strategy. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Sun Q.Q.,Anhui Normal University
Genetics and molecular research : GMR | Year: 2012

We sequenced the complete mitochondrial genome of Phalera flavescens. The mitogenome is 15,659 bp in length, including 13 protein-coding genes (atp6, atp8, cox1-3, nad1-6, nad4L, cob), two ribosomal RNAs (rrnS and rrnL), 22 transfer RNAs and an AT-rich region, a putative control region (D-loop). Gene order and orientation were found to be identical to those of other completely sequenced lepidopteran mitogenomes. All 13 protein-coding genes start with the common codon ATN, except for the cox1 gene, which uses CGA as the initial codon. Nine of the 13 protein-coding genes stop with codon TAA, while the cox1, cox2, nad5, and nad4 genes stop with the single nucleotide T. All tRNA genes can be folded into canonical cloverleaf secondary structure, except for trnS1, which loses the ''DHU'' arm. Six overlapping sequences totaling 20 bp (1-8 bp for each sequence) and 16 intergenic spacer sequences, totaling 276 bp (1-58 bp for each sequence) are scattered throughout the genome; the largest intergenic spacer is located between the trnQ and nad2 genes. A microsatellite-like structure (AT)(6)ACC(AT)(6) and 16-bp poly-T elements preceded by the ATTTA motif are present in the D-loop region. Additionally, unexpectedly, an extra 190-bp insertion, with unknown function, was found in the small subunit rRNA gene (rrnS); this gene is the longest known (1020 bp) among all of the Lepidoptera.

Zhang Y.,Anhui Normal University | Jiang W.,Anhui Normal University
Electrochimica Acta | Year: 2012

In this study, we developed a hybrid biosensor composed of reduced graphene oxide (rGO) sheets decorated with gold nanoparticles (Au NPs) for sequence-specific DNA detection. The DNA probe (HS-DNA) was covalently linked to the surface of Au NPs/rGO via an Au - S bond, and scanning electron microscopy and electrochemical impedance spectra were used to the assemble the electrode surface. Furthermore, differential pulse voltammetry was utilized to monitor the DNA hybridization event by measuring the changes in peak current of the intercalated adriamycin. The peak currents of adriamycin were linear with the concentration of complementary DNA, which ranged from 1.0 × 10 -8 to 1.0 × 10 -13 moldmr -3 with a detection limit of 3.5 × 10 -14 moldmr -3 (signal/noise ratio of 3) under the optimal conditions. Moreover, the complementary DNA sequence was detected in the presence of a large amount of three-base mismatched DNA (1000:1), which indicates that the biosensor has high selectivity. © 2012 Elsevier Ltd. All rights reserved.

The selective growth of Au nanoparticles on (111) facets of truncated octahedral and cuboctahedral Cu2O crystals has been achieved by exploiting the differences in the standard potential between AuCl 4 -/Au and Cu2+/Cu2O pairs and in surface energies between (111) and (100) planes. The density and size of Au nanoparticles can be controlled by tuning the concentration of the gold precursor. Truncated octahedral Cu2O-Au nanocomposites have a 10 times higher electrochemically catalytic activity toward H2O 2 reduction than do pure Cu2O crystals. The enhanced catalysis may be derived from the polarization of Au NPs at the interface, which makes Cu2O more active for H2O2 reduction. © 2011 American Chemical Society.

Shen P.,Anhui Normal University | Xia Y.,Anhui Normal University
Analytical Chemistry | Year: 2014

In this paper, we have presented a novel strategy to fabricate fluorescent boronic acid modified carbon dots (C-dots) for nonenzymatic blood glucose sensing applications. The functionalized C-dots are obtained by one-step hydrothermal carbonization, using phenylboronic acid as the sole precursor. Compared with conventional two-step fabrication of nanoparticle-based sensors, the present "synthesis-modification integration" strategy is simpler and more efficient. The added glucose selectively leads to the assembly and fluorescence quenching of the C-dots. Such fluorescence responses can be used for well quantifying glucose in the range of 9-900 μM, which is 10-250 times more sensitive than that of previous boronic acid based fluorescent nanosensing systems. Due to "inert" surface, the C-dots can well resist the interferences from various biomolecules and exhibit excellent selectivity. The proposed sensing system has been successfully used for the assay of glucose in human serum. Due to simplicity and effectivity, it exhibits great promise as a practical platform for blood glucose sensing. © 2014 American Chemical Society.

Xia Y.,Anhui Normal University | Tang Z.,CAS National Center for Nanoscience and Technology
Chemical Communications | Year: 2012

Monodisperse inorganic supraparticles (SPs) are an emerging and hot research topic in the chemistry, physics and materials science communities in the past several years. Monodisperse inorganic SPs exhibit unique physiochemical properties due to their well-defined shape and distinctive topological structure. This review summarizes recent progress in the study of formation mechanism, properties and applications of inorganic monodisperse SPs. The future developments in this research area are also discussed. © 2012 The Royal Society of Chemistry.

The dehydrogenation of pyrrolyl-functionalized secondary amines initiated by rare-earth metal amides was systematically studied. Reactions of the rare-earth metal amides [(Me(3)Si)(2)N](3)RE(μ-Cl)Li(THF)(3) with pyrrolyl-functionalized secondary amines 2-(t)BuNHCH(2)-5-R-C(4)H(2)NH (R = H (1), R = (t)Bu (2)) led to dehydrogenation of the secondary amines with isolation of imino-functionalized pyrrolyl rare-earth metal complexes [2-(t)BuN=CH-5-R-C(4)H(2)N](2)REN(SiMe(3))(2) (R = H, RE = Y (3a), Dy (3b), Yb (3c), Eu (3d); R = (t)Bu, RE = Y (4a), Dy (4b), Er (4c)). The mixed ligands erbium complex [2-(t)BuNCH(2)-5-(t)Bu-C(4)H(2)N]Er[2-(t)BuN=CH-5-(t)BuC(4)H(2)N](2)ClLi(2)(THF) (4c') was isolated in a short reaction time for the synthesis of complex 4c. Reaction of the deuterated pyrrolyl-functionalized secondary amine 2-((t)BuNHCHD)C(4)H(3)NH with yttrium amide [(Me(3)Si)(2)N](3)Y(μ-Cl)Li(THF)(3) further proved that pyrrolyl-amino ligands were transferred to pyrrolyl-imino ligands. Treatment of 2-((t)BuNHCH(2))C(4)H(3)NH (1) with excess (Me(3)Si)(2)NLi gave the only pyrrole deprotonated product {[η(5):η(2):η(1)-2-((t)BuNHCH(2))C(4)H(3)N]Li(2)N(SiMe(3))(2)}(2) (5), indicating that LiN(SiMe(3))(2) could not dehydrogenate the secondary amines to imines and rare-earth metal ions had a decisive effect on the dehydrogenation. The reaction of the rare-earth metal amides [(Me(3)Si)(2)N](3)RE(μ-Cl)Li(THF)(3) with 1 equiv. of more bulky pyrrolyl-functionalized secondary amine 2-[(2,6-(i)Pr(2)C(6)H(3))NHCH(2)](C(4)H(3)NH) (6) in toluene afforded the only amine and pyrrole deprotonated dinuclear rare-earth metal amido complexes {(μ-η(5):η(1)):η(1)-2-[(2,6-(i)Pr(2)C(6)H(3))NCH(2)]C(4)H(3)N]LnN(SiMe(3))(2)}(2) (RE = Nd (7a), Sm (7b), Er (7c)), no dehydrogenation of secondary amine to imine products were observed. On the basis of experimental results, a plausible mechanism for the dehydrogenation of secondary amines to imines was proposed.

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