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学者姓名：亓秀娟
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Abstract ：
The synthesis, purification, and structure characterization of a seven-ring interlocked DNA catenane is described. The design of the seven-ring catenane allows the dynamic reconfiguration of any of the four rings (R-1, R-3, R-4, and R-6) on the catenane scaffold, or the simultaneous switching of any combination of two, three, or all four rings to yield 16 different isomeric states of the catenane. The dynamic reconfiguration across the states is achieved by implementing the strand-displacement process in the presence of appropriate fuel/antifuel strands and is probed by fluorescence spectroscopy. Each of the 16 isomers of the catenane can be transformed into any of the other isomers, thus allowing for 240 dynamic transitions within the system.
Keyword ：
fluorescence fluorescence machine machine Nanobiotechnology Nanobiotechnology strand displacement strand displacement switch switch
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| GB/T 7714 | Lu, Chun-Hua , Cecconello, Alessandro , Qi, Xiu-Juan et al. Switchable Reconfiguration of a Seven-Ring Interlocked DNA Catenane Nanostructure [J]. | NANO LETTERS , 2015 , 15 (10) : 7133-7137 . |
| MLA | Lu, Chun-Hua et al. "Switchable Reconfiguration of a Seven-Ring Interlocked DNA Catenane Nanostructure" . | NANO LETTERS 15 . 10 (2015) : 7133-7137 . |
| APA | Lu, Chun-Hua , Cecconello, Alessandro , Qi, Xiu-Juan , Wu, Na , Jester, Stefan-Sven , Famulok, Michael et al. Switchable Reconfiguration of a Seven-Ring Interlocked DNA Catenane Nanostructure . | NANO LETTERS , 2015 , 15 (10) , 7133-7137 . |
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Acrylamide acrylamide nucleic acids are cross-linked by two cooperative functional motives to form shaped acrylamide-DNA hydrogels. One of the cross-linking motives responds to an external trigger, leading to the dissociation of one of the stimuli-responsive bridges, and to the transition of the stiff shaped hydrogels into soft shapeless states, where the residual bridging units, due to the chains entanglement, provide an intrinsic memory for the reshaping of the hydrogels. Subjecting the shapeless states to counter stimuli restores the dissociated bridges, and regenerates the original shape of the hydrogels. By the cyclic dissociation and reassembly of the stimuli-responsive bridges, the reversible switchable transitions of the hydrogels between stiff shaped hydrogel structures and soft shapeless states are demonstrated. Shaped hydrogels bridged by K+-stabilized G-quadruplexes/duplex units, by i-motif/duplex units, or by two different duplex bridges are described. The cyclic transitions of the hydrogels between shaped and shapeless states are stimulated, in the presence of appropriate triggers and counter triggers (K+ ion/crown ether; pH = 5.0/8.0; fuel/antifuel strands). The shape-memory hydrogels are integrated into shaped two-hydrogel or three-hydrogel hybrid structures. The cyclic programmed transitions of selective domains of the hybrid structures between shaped hydrogel and shapeless states are demonstrated. The possible applications of the shape-memory hydrogels for sensing, inscription of information, and controlled release of loads are discussed.
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| GB/T 7714 | Lu, Chun-Hua , Guo, Weiwei , Hu, Yuwei et al. Multitriggered Shape-Memory Acrylamide-DNA Hydrogels [J]. | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2015 , 137 (50) : 15723-15731 . |
| MLA | Lu, Chun-Hua et al. "Multitriggered Shape-Memory Acrylamide-DNA Hydrogels" . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 137 . 50 (2015) : 15723-15731 . |
| APA | Lu, Chun-Hua , Guo, Weiwei , Hu, Yuwei , Qi, Xiu-Juan , Willner, Itamar . Multitriggered Shape-Memory Acrylamide-DNA Hydrogels . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2015 , 137 (50) , 15723-15731 . |
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| GB/T 7714 | Guo, Weiwei , Lu, Chun-Hua , Orbach, Ron et al. pH-Stimulated DNA Hydrogels Exhibiting Shape-Memory Properties [J]. | ADVANCED MATERIALS , 2015 , 27 (1) : 73-78 . |
| MLA | Guo, Weiwei et al. "pH-Stimulated DNA Hydrogels Exhibiting Shape-Memory Properties" . | ADVANCED MATERIALS 27 . 1 (2015) : 73-78 . |
| APA | Guo, Weiwei , Lu, Chun-Hua , Orbach, Ron , Wang, Fuan , Qi, Xiu-Juan , Cecconello, Alessandro et al. pH-Stimulated DNA Hydrogels Exhibiting Shape-Memory Properties . | ADVANCED MATERIALS , 2015 , 27 (1) , 73-78 . |
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Abstract ：
A G-rich nucleic acid-tethered acrylamide/N-isopropylacrylamide (NIPAM) copolymer is prepared. The nucleic acid-modified pNIPAM chains assemble, in the presence of K+ ions, into a stimuli-responsive G-quadruplex-crosslinked pNIPAM hydrogel undergoing cyclic and reversible solution/hydrogel/solid transitions. Addition of kryptofix [2.2.2], CP, to the K+-stabilized G-quadruplex-crosslinked hydrogel eliminates the K+ ions from the crosslinking units, resulting in the transition of the hydrogel into a pNIPAM solution. In turn, heating the pNIPAM hydrogel from 25 degrees C to 40 degrees C results in the transition of the hydrogel to the solid state, and cooling the solid to 25 degrees C restores the hydrogel state. Incorporation of hemin into the G-quadruplex-crosslinked hydrogel results in a catalytic hydrogel that catalyzes the oxidation of aniline by H2O2 to form polyaniline. The polyaniline/pNIPAM hydrogel hybrid doped with 2 M HCl forms an emeraldine salt, which exhibits an electrical conductivity of 9 x 10(-4) [cm Omega](-1).
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| GB/T 7714 | Lu, Chun-Hua , Guo, Weiwei , Qi, Xiu-Juan et al. Hemin-G-quadruplex-crosslinked poly-N-isopropylacrylamide hydrogel: a catalytic matrix for the deposition of conductive polyaniline [J]. | CHEMICAL SCIENCE , 2015 , 6 (11) : 6659-6664 . |
| MLA | Lu, Chun-Hua et al. "Hemin-G-quadruplex-crosslinked poly-N-isopropylacrylamide hydrogel: a catalytic matrix for the deposition of conductive polyaniline" . | CHEMICAL SCIENCE 6 . 11 (2015) : 6659-6664 . |
| APA | Lu, Chun-Hua , Guo, Weiwei , Qi, Xiu-Juan , Neubauer, Avner , Paltiel, Yossi , Willner, Itamar . Hemin-G-quadruplex-crosslinked poly-N-isopropylacrylamide hydrogel: a catalytic matrix for the deposition of conductive polyaniline . | CHEMICAL SCIENCE , 2015 , 6 (11) , 6659-6664 . |
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Abstract ：
Interlocked DNA rings (catenanes) are interesting reconfigurable nanostructures. The synthesis of catenanes with more than two rings is, however, hampered, owing to low yields of these systems. We report a new method for the synthesis of catenanes with a controlled number of rings in satisfactory yields. Our approach is exemplified by the synthesis of a five-ring DNA catenane that exists in four different configurations. By the use of nucleic acids as "fuels" and "antifuels", the cyclic reconfiguration of the system across four states is demonstrated. One of the states, olympiadane, corresponds to the symbol of the Olympic Games. The five-ring catenane was implemented as a mechanical scaffold for the reconfiguration of Au NPs. The advantages of DNA catenanes over supramolecular catenanes include the possibility of generating highly populated defined states and the feasibility of tethering nanoobjects to the catenanes, which act as a mechanical scaffold to reconfigure the nanoobjects.
Keyword ：
DNA catenanes DNA catenanes molecular devices molecular devices nanoparticles nanoparticles strand displacement strand displacement switches switches
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| GB/T 7714 | Lu, Chun-Hua , Qi, Xiu-Juan , Cecconello, Alessandro et al. Switchable Reconfiguration of an Interlocked DNA Olympiadane Nanostructure [J]. | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2014 , 53 (29) : 7499-7503 . |
| MLA | Lu, Chun-Hua et al. "Switchable Reconfiguration of an Interlocked DNA Olympiadane Nanostructure" . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 53 . 29 (2014) : 7499-7503 . |
| APA | Lu, Chun-Hua , Qi, Xiu-Juan , Cecconello, Alessandro , Jester, Stefan-Sven , Famulok, Michael , Willner, Itamar . Switchable Reconfiguration of an Interlocked DNA Olympiadane Nanostructure . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2014 , 53 (29) , 7499-7503 . |
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DNA-tethered poly-N-isopropylacrylamide copolymer chains, pNIPAM, that include nucleic acid tethers have been synthesized. They are capable of inducing pH-stimulated crosslinking of the chains by i-motif structures or to be bridged by Ag+ ions to form duplexes. The solutions of pNIPAM chains undergo crosslinking at pH 5.2 or in the presence of Ag+ ions to form hydrogels. The hydrogels reveal switchable hydrogel-to-solution transitions by the reversible crosslinking of the chains at pH 5.2 and the separation of the crosslinking units at pH 7.5, or by the Ag+ ion-stimulated crosslinking of the chains and the reverse dissolution of the hydrogel by the cysteamine-induced elimination of the Ag+ ions. The DNA-crosslinked hydrogels are thermosensitive and undergo reversible temperature-controlled hydrogel-to-solid transitions. The solid pNIPAM matrices are protected against the OH- or cysteamine-stimulated dissociation to the respective polymer solutions.
Keyword ：
N-isopropylacrylamide N-isopropylacrylamide nucleic acids nucleic acids phase transitions phase transitions reversible hydrogels reversible hydrogels thermosensitive polymers thermosensitive polymers
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| GB/T 7714 | Guo, Weiwei , Lu, Chun-Hua , Qi, Xiu-Juan et al. Switchable Bifunctional Stimuli-Triggered Poly-N-Isopropylacrylamide/DNA Hydrogels [J]. | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2014 , 53 (38) : 10134-10138 . |
| MLA | Guo, Weiwei et al. "Switchable Bifunctional Stimuli-Triggered Poly-N-Isopropylacrylamide/DNA Hydrogels" . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 53 . 38 (2014) : 10134-10138 . |
| APA | Guo, Weiwei , Lu, Chun-Hua , Qi, Xiu-Juan , Orbach, Ron , Fadeev, Michael , Yang, Huang-Hao et al. Switchable Bifunctional Stimuli-Triggered Poly-N-Isopropylacrylamide/DNA Hydrogels . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2014 , 53 (38) , 10134-10138 . |
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Abstract ：
DNA hydrogels, consisting of Y-shaped nucleic acid subunits or of nucleic acid-functionalized acrylamide chains, undergo switchable gel-to-solution transitions. The Ag+-stimulated formation of cytosine Ag+-cytosine complexes results in the crosslinking of the units to yield the hydrogels, while the cysteamine-induced elimination of the Ag+ ions dissociates the hydrogels into a solution phase.
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| GB/T 7714 | Guo, Weiwei , Qi, Xiu-Juan , Orbach, Ron et al. Reversible Ag+-crosslinked DNA hydrogels [J]. | CHEMICAL COMMUNICATIONS , 2014 , 50 (31) : 4065-4068 . |
| MLA | Guo, Weiwei et al. "Reversible Ag+-crosslinked DNA hydrogels" . | CHEMICAL COMMUNICATIONS 50 . 31 (2014) : 4065-4068 . |
| APA | Guo, Weiwei , Qi, Xiu-Juan , Orbach, Ron , Lu, Chun-Hua , Freage, Lina , Mironi-Harpaz, Iris et al. Reversible Ag+-crosslinked DNA hydrogels . | CHEMICAL COMMUNICATIONS , 2014 , 50 (31) , 4065-4068 . |
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A two-ring (a/b) interlocked DNA catenane rotor system is described. Using appropriate fuel and anti-fuel strands, the triggered switchable rotation across three states S-1, S-2 and S-3 associated with the circular track of ring a is demonstrated.
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| GB/T 7714 | Qi, Xiu-Juan , Lu, Chun-Hua , Cecconello, Alessandro et al. A two-ring interlocked DNA catenane rotor undergoing switchable transitions across three states [J]. | CHEMICAL COMMUNICATIONS , 2014 , 50 (36) : 4717-4720 . |
| MLA | Qi, Xiu-Juan et al. "A two-ring interlocked DNA catenane rotor undergoing switchable transitions across three states" . | CHEMICAL COMMUNICATIONS 50 . 36 (2014) : 4717-4720 . |
| APA | Qi, Xiu-Juan , Lu, Chun-Hua , Cecconello, Alessandro , Yang, Huang-Hao , Willner, Itamar . A two-ring interlocked DNA catenane rotor undergoing switchable transitions across three states . | CHEMICAL COMMUNICATIONS , 2014 , 50 (36) , 4717-4720 . |
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An oscillatory pH system is implemented to drive oscillatory pH-switchable DNA machine:: and to control pH-stimulated electron transfer at electrode surfraces, The oscillatory pH system drives the autonomous opening and closure of DNA tweezers and activates a DNA pendulum by the pH-stimulated formation and dissociation of i-motif structures. Also, a sequence-programmed nucleic acid monolayer-functionalized electrode undergoes autonomous oscillatory pH transitions between random coil and i-motif configurations, leading to the control of electron transfer at electrode surfaces.
Keyword ：
electrode electrode i-Motif i-Motif impedance impedance monolayer monolayer tweezers tweezers
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| GB/T 7714 | Qi, Xiu-Juan , Lu, Chun-Hua , Liu, Xiaoqing et al. Autonomous Control of Interfacial Electron Transfer and the Activation of DNA Machines by an Oscillatory pH System [J]. | NANO LETTERS , 2013 , 13 (10) : 4920-4924 . |
| MLA | Qi, Xiu-Juan et al. "Autonomous Control of Interfacial Electron Transfer and the Activation of DNA Machines by an Oscillatory pH System" . | NANO LETTERS 13 . 10 (2013) : 4920-4924 . |
| APA | Qi, Xiu-Juan , Lu, Chun-Hua , Liu, Xiaoqing , Shimron, Simcha , Yang, Huang-Hao , Willner, Itamar . Autonomous Control of Interfacial Electron Transfer and the Activation of DNA Machines by an Oscillatory pH System . | NANO LETTERS , 2013 , 13 (10) , 4920-4924 . |
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Copolymer chains consisting of acrylamide units and guanine (G)-containing oligonucleotide-tethered acrylamide units undergo, in the presence of K+ ions, cross-linking by G-quadruplexes to yield a hydrogel. The hydrogel is dissociated upon addition of 18-crown-6 ether that traps the K+ ions. Reversible formation and dissociation of the hydrogel is demonstrated by the cyclic addition of K+ ions and 18-crown-6 ether, respectively. Formation of the hydrogel in the presence of hemin results in a hemin/G-quadruplex-cross-linked catalytic hydrogel mimicking the function of horseradish peroxidase, reflected by the catalyzed oxidation of 2,2'-azinobis-(3-ethylbenzthiazoline-6-sulfonic acid), ABTS(2-), by H2O2 to ABTS(-) and by the catalyzed generation of chemiluminescence in the presence of luminol/H2O2. Cyclic "ON" and "OFF" activation of the catalytic functions of the hydrogel are demonstrated upon the formation of the hydrogel in the presence of K+ ions and its dissociation by 18-crown-6 ether, respectively. The hydrogel is characterized by rheology measurements, circular dichroism, and probing its chemical and photophysical properties.
Keyword ：
Catalysis Catalysis chemiluminescence chemiluminescence G-quadruplex G-quadruplex hydrogel hydrogel switch switch
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| GB/T 7714 | Lu, Chun-Hua , Qi, Xiu-Juan , Orbach, Ron et al. Switchable Catalytic Acrylamide Hydrogels Cross-Linked by Hemin/G-Quadruplexes [J]. | NANO LETTERS , 2013 , 13 (3) : 1298-1302 . |
| MLA | Lu, Chun-Hua et al. "Switchable Catalytic Acrylamide Hydrogels Cross-Linked by Hemin/G-Quadruplexes" . | NANO LETTERS 13 . 3 (2013) : 1298-1302 . |
| APA | Lu, Chun-Hua , Qi, Xiu-Juan , Orbach, Ron , Yang, Huang-Hao , Mironi-Harpaz, Iris , Seliktar, Dror et al. Switchable Catalytic Acrylamide Hydrogels Cross-Linked by Hemin/G-Quadruplexes . | NANO LETTERS , 2013 , 13 (3) , 1298-1302 . |
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