51
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Yang D, Dai C, Hu Y, Liu S, Weng L, Luo Z, Cheng Y, Wang L. A New Polymer-Based Fluorescent Chemosensor Incorporating Propane-1,3-Dione and 2,5-Diethynylbenzene Moieties for Detection of Copper(II) and Iron(III). Polymers (Basel) 2017; 9:E267. [PMID: 30970945 PMCID: PMC6431840 DOI: 10.3390/polym9070267] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 06/27/2017] [Accepted: 07/03/2017] [Indexed: 11/16/2022] Open
Abstract
A novel conjugated polymer (PDBDBM) was developed by the polymerization of 1,4-dioctyloxy-2,5-diethynylbenzene with 1,3-bis(4-bromophenyl)propane-1,3-dione based on Pd-catalyzed Sonogashira-coupling reaction. The obtained polymer PDBDBM exhibited bright green photoluminescence under UV irradiation. According to the metal ion titration experiments, PDBDBM showed high sensitivity and selectivity for detection of Cu2+ and Fe3+ over other metal ions. The fluorescent detection limits of PDBDBM were calculated to be 5 nM for Cu2+ and 0.4 μM for Fe3+ and the Stern⁻Volmer quenching constant for Cu2+ and Fe3+ were found to be 1.28 × 10⁸ M-1 and 2.40 × 10⁴ M-1, respectively. These results indicated that the polymer can be used as a potential probe for Cu2+ and Fe3+ detection.
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Lin H, Dai C, Jamison TF, Jensen KF. A Rapid Total Synthesis of Ciprofloxacin Hydrochloride in Continuous Flow. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703812] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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53
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Lin H, Dai C, Jamison TF, Jensen KF. A Rapid Total Synthesis of Ciprofloxacin Hydrochloride in Continuous Flow. Angew Chem Int Ed Engl 2017; 56:8870-8873. [PMID: 28561939 DOI: 10.1002/anie.201703812] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Indexed: 01/02/2023]
Abstract
Within a total residence time of 9 min, the sodium salt of ciprofloxacin was prepared from simple building blocks via a linear sequence of six chemical reactions in five flow reactors. Sequential offline acidifications and filtrations afforded ciprofloxacin and ciprofloxacin hydrochloride. The overall yield of the eight-step sequence was 60 %. No separation of intermediates was required throughout the synthesis when a single acylation reaction was applied to remove the main byproduct, dimethylamine.
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54
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Joung D, Nemilentsau A, Agarwal K, Dai C, Liu C, Su Q, Li J, Low T, Koester SJ, Cho JH. Self-Assembled Three-Dimensional Graphene-Based Polyhedrons Inducing Volumetric Light Confinement. NANO LETTERS 2017; 17:1987-1994. [PMID: 28147479 DOI: 10.1021/acs.nanolett.6b05412] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The ability to transform two-dimensional (2D) materials into a three-dimensional (3D) structure while preserving their unique inherent properties might offer great enticing opportunities in the development of diverse applications for next generation micro/nanodevices. Here, a self-assembly process is introduced for building free-standing 3D, micro/nanoscale, hollow, polyhedral structures configured with a few layers of graphene-based materials: graphene and graphene oxide. The 3D structures have been further modified with surface patterning, realized through the inclusion of metal patterns on their 3D surfaces. The 3D geometry leads to a nontrivial spatial distribution of strong electric fields (volumetric light confinement) induced by 3D plasmon hybridization on the surface of the graphene forming the 3D structures. Due to coupling in all directions, resulting in 3D plasmon hybridization, the 3D closed box graphene generates a highly confined electric field within as well as outside of the cubes. Moreover, since the uniform coupling reduces the decay of the field enhancement away from the surface, the confined electric field inside of the 3D structure shows two orders of magnitude higher than that of 2D graphene before transformation into the 3D structure. Therefore, these structures might be used for detection of target substances (not limited to only the graphene surfaces, but using the entire volume formed by the 3D graphene-based structure) in sensor applications.
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Dai C, Genovino J, Bechle BM, Corbett MS, Huh CW, Rose CR, Sun J, Warmus JS, Blakemore DC. One-Pot Synthesis of α-Branched N-Acylamines via Titanium-Mediated Condensation of Amides, Aldehydes, and Organometallics. Org Lett 2017; 19:1064-1067. [PMID: 28199125 DOI: 10.1021/acs.orglett.7b00082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A three-component, titanium-mediated synthesis of α-branched N-acylamines from commercial or readily accessible amides, aldehydes, and organometallic reagents is reported. The transformation proceeds under mild reaction conditions and tolerates a variety of functional groups (including nitrile, carbamate, olefin, basic amine, furan, and other sensitive heteroaromatics) to generate a large umbrella of α-branched N-acylamine products in high yields. The operationally practical procedure enables the use of this method in parallel chemical synthesis, a valuable feature that can facilitate the screening of bioactive molecules by medicinal chemists.
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Dai C, Joung D, Cho JH. Plasma Triggered Grain Coalescence for Self-Assembly of 3D Nanostructures. NANO-MICRO LETTERS 2017; 9:27. [PMID: 30393722 PMCID: PMC6199026 DOI: 10.1007/s40820-017-0130-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Accepted: 01/13/2017] [Indexed: 05/10/2023]
Abstract
Grain coalescence has been applied in many areas of nanofabrication technology, including modification of thin-film properties, nanowelding, and self-assembly of nanostructures. However, very few systematic studies of self-assembly using the grain coalescence, especially for three-dimensional (3D) nanostructures, exist at present. Here, we investigate the mechanism of plasma triggered grain coalescence to achieve the precise control of nanoscale phase and morphology of the grain coalescence induced by exothermic energy. Exothermic energy is generated through etching a silicon substrate via application of plasma. By tuning the plasma power and the flow rates of reactive gases, different etching rates and profiles can be achieved, resulting in various morphologies of grain coalescence. Balancing the isotropic/anisotropic substrate etching profile and the etching rate makes it possible to simultaneously release 2D nanostructures from the substrate and induce enough surface tension force, generated by grain coalescence, to form 3D nanostructures. Diverse morphologies of 3D nanostructures have been obtained by the grain coalescence, and a strategy to achieve self-assembly, resulting in desired 3D nanostructures, has been proposed and demonstrated.
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Li Y, Wu X, Wang S, Wang W, Xiang Y, Dai C, Liu Z, He Z, Wu X. Surfactant-assisted solvothermal synthesis of NiCo2O4 as an anode for lithium-ion batteries. RSC Adv 2017. [DOI: 10.1039/c7ra06172b] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The as-prepared NiCo2O4 nanoparticles through microemulsion-solvothermal growth and subsequent calcination in air exhibits excellent rate performance and cyclic stability.
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Guan B, Dai C, Zhang Y, Zhu L, He X, Wang N, Liu H. Early diagnosis and outcome prediction of neonatal hypoxic-ischemic encephalopathy with color Doppler ultrasound. Diagn Interv Imaging 2016; 98:469-475. [PMID: 28024912 DOI: 10.1016/j.diii.2016.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 11/19/2016] [Accepted: 12/04/2016] [Indexed: 11/30/2022]
Abstract
PURPOSE To describe the ultrasound presentation of the brain and cerebral hemodynamics in neonates with hypoxic-ischemic encephalopathy (HIE) by comparison with control subjects. MATERIAL AND METHODS During June 2012 to April 2013, full term neonates who had clinical evidence of HIE were enrolled. Healthy newborns without HIE were used as a control group. Cerebral parenchyma, size of lateral ventricles and hemodynamic parameters of cerebral arteries were studied using two-dimensional duplex and color Doppler ultrasound. Neonates with moderate and severe HIE were followed-up with ultrasound for at least 3 months. RESULTS A total of 158 consecutive neonates (82 boys and 76 girls), including 54 with mild HIE, 60 with moderate HIE and 44 with severe HIE were included. One hundred and twenty healthy newborns were randomly selected as a control group. Abnormal ultrasound findings of brain parenchyma were found in 25/54 (46.3%) neonates with mild HIE whereas they were found in 58/60 (96.7%) neonates with moderate HIE and 44/44 (100%) neonates with severe HIE. Almost all neonates with severe HIE had decreased cerebral artery blood flow velocity and increased resistance index of cerebral arteries. Of the 104 neonates with moderate or severe HIE, follow-up ultrasound examination revealed cystic parenchymal lesions in 12/104 (11.5%), progressive ventricular dilatation and brain atrophy in 12/104 (11.5%), mild ventricular dilatation in 15/104 (14.4%) and leukoencephalomalacia in 2/104 (1.9%) neonates. CONCLUSION Ultrasound features such as the size of lateral ventricles, altered brain parenchymal echogenicity and cerebral blood flow parameters are useful for the early diagnosis of HIE and help predict outcome.
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Dai C, Miller J, Shah C, Tendulkar R. Clinical Outcomes Following Breast-Conserving Therapy Versus Mastectomy for T1-2N0 Triple-Negative Breast Cancer. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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60
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Devery JJ, Nguyen JD, Dai C, Stephenson CRJ. Light-Mediated Reductive Debromination of Unactivated Alkyl and Aryl Bromides. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01914] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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61
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Dai C, Jiang M, Sun MJ. Letter: irritable bowel syndrome-type symptoms in paediatric inflammatory bowel disease. Aliment Pharmacol Ther 2016; 44:308-9. [PMID: 27375101 DOI: 10.1111/apt.13680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 05/08/2016] [Indexed: 12/13/2022]
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62
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Dai C, Cho JH. In Situ Monitored Self-Assembly of Three-Dimensional Polyhedral Nanostructures. NANO LETTERS 2016; 16:3655-60. [PMID: 27171023 DOI: 10.1021/acs.nanolett.6b00797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The self-assembly of 3D nanostructures is a promising technology for the fabrication of next generation nanodevices and the exploration of novel phenomena. However, the present techniques for assembly of 3D nanostructures are invisible and have to be done without physical contact, which bring great challenges in controlling the shapes with nanoscale precision. This situation leads to an extremely low yield of self-assembly, especially in 3D nanostructures built with metal and semiconductor materials. Here, an in situ self-assembly process using a focused ion beam (FIB) microscopy system has been demonstrated to realize 3D polyhedral nanostructures from 2D multiple pieces. An excited ion beam in the FIB microscopy system offers not only a visualization of the nanoscale self-assembly process but also the necessary energy for inducing the process. Because the beam energy that induces the self-assembly can be precisely adjusted while monitoring the status of the self-assembly, it is possible to control the self-assembly process with sub-10 nm scale precision, resulting in the realization of diverse 3D nanoarchitectures with a high yield. This approach will lead to state-of-the-art applications utilizing properties of 3D nanostructures in diverse fields.
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63
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Dai C, Jiang M, Sun MJ. Letter: mucosal healing is associated with improved long-term outcomes in Crohn's disease. Aliment Pharmacol Ther 2016; 43:1346. [PMID: 27166987 DOI: 10.1111/apt.13627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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64
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Feng Y, Dai C, Lei J, Ju H, Cheng Y. Silole-Containing Polymer Nanodot: An Aqueous Low-Potential Electrochemiluminescence Emitter for Biosensing. Anal Chem 2015; 88:845-50. [DOI: 10.1021/acs.analchem.5b03391] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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65
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Liu X, Zhang X, Zhang Z, Chang J, Wu Z, Wang C, Sun Z, Ge X, Geng R, Tang W, Dai C, Lin Y, Sun M, Jia W, Xue W, Hu Y, Li J. 27PD Plasma miRNA-based signatures to predict 3-year postoperative recurrence risk for patients with stage II and III gastric cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv518.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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66
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Dai C, Snead DR, Zhang P, Jamison TF. Continuous-flow synthesis and purification of atropine with sequential in-line separations of structurally similar impurities. J Flow Chem 2015. [DOI: 10.1556/1846.2015.00013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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67
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Li F, Wang Y, Meng F, Dai C, Cheng Y, Zhu C. Central-to-Axial Chirality Transfer-Induced CD Sensor for Chiral Recognition and ee
Value Detection of 1,2-DACH Enantiomers. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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68
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Zhang S, Wang Y, Meng F, Dai C, Cheng Y, Zhu C. Circularly polarized luminescence of AIE-active chiral O-BODIPYs induced via intramolecular energy transfer. Chem Commun (Camb) 2015; 51:9014-7. [PMID: 25939571 DOI: 10.1039/c5cc01994j] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Two AIE-active chiral BINOL-based O-BODIPY enantiomers (R/S-5) were synthesized and showed mirror-image red-color CPL induced via intramolecular energy transfer. The chiroptical properties of the molecules indicate that the chirality of electronic ground and excited states is stable and independent of aggregation.
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Dang J, Yin F, You T, Dai C, Wang J. TH-CD-303-12: Sliding Motion Compensated Simultaneous 4D-CBCT Reconstruction. Med Phys 2015. [DOI: 10.1118/1.4926247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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70
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You T, Dang J, Dai C, Yin F. SU-E-T-347: Effect of MLC Leaf Position Inaccuracy On Dose Distribution for Spinal SBRT with Different Energies and Dose Rates. Med Phys 2015. [DOI: 10.1118/1.4924708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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71
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Shi D, Dai C, Qin J, Gu W. Negative regulation of the p300-p53 interplay by DDX24. Oncogene 2015; 35:528-36. [PMID: 25867071 PMCID: PMC4603993 DOI: 10.1038/onc.2015.77] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 02/09/2015] [Accepted: 02/16/2015] [Indexed: 12/15/2022]
Abstract
Numerous studies indicate that p300 acts as a key transcriptional cofactor in vivo, at least, in part, through modulating activities of p53 by acetylation. Nevertheless, the regulation of the p53-p300 interplay is not completely understood. Here, we have identified the DEAD box RNA helicase DDX24 as a novel regulator of the p300-p53 axis. We found that DDX24 interacts with p300, and this interaction leads to suppression of p300 mediated acetylation of p53. Notably, RNAi-mediated knockdown of endogenous DDX24 significantly increases the acetylation levels of endogenous p53 in human cancer cells and subsequently promotes p53-mediated activation of its transcriptional targets such as p21 and PUMA. In contrast, DDX24 expression inhibits the p300-p53 interaction and suppresses p300-mediated acetylation of p53. Moreover, DDX24 is overexpressed in human cancer cells and reduction of DDX24 protein levels by RNAi induces cell cycle arrest and senescence in a p53 dependent manner. These results reveal DDX24 as an important regulator of p300 and suggest that the modulation of the p53-p300 interplay by DDX24 is critical in controlling p53 activities in human cancer cells.
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72
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Dai C, Jiang M, Sun MJ. Letter: irritable bowel syndrome is significantly associated with somatisation. Aliment Pharmacol Ther 2015; 41:791. [PMID: 25781045 DOI: 10.1111/apt.13114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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73
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Dai C, Yang D, Fu X, Chen Q, Zhu C, Cheng Y, Wang L. A study on tunable AIE (AIEE) of boron ketoiminate-based conjugated polymers for live cell imaging. Polym Chem 2015. [DOI: 10.1039/c5py00733j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, four boron ketoiminate-based conjugated polymers P1–P4 are designed and synthesized via Suzuki polymerization.
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Dai C, Yang D, Zhang W, Fu X, Chen Q, Zhu C, Cheng Y, Wang L. Boron ketoiminate-based conjugated polymers with tunable AIE behaviours and their applications for cell imaging. J Mater Chem B 2015; 3:7030-7036. [DOI: 10.1039/c5tb01262g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of AIE-active D–A type conjugated polymers incorporating boron ketoiminate units were synthesized and applied for cell imaging.
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75
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Dai C, Yang D, Zhang W, Bao B, Cheng Y, Wang L. Far-red/near-infrared fluorescent conjugated polymer nanoparticles with size-dependent chirality and cell imaging applications. Polym Chem 2015. [DOI: 10.1039/c5py00344j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We prepared a series of novel chiral far-red/near-infrared fluorescent CPNs with different nanoparticle sizes, which show size-dependent chirality and are successfully employed for cell imaging.
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