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Articles de revues sur le sujet « Formation of supramolecules »

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Auteur : Grafiati
Publié le 17 juillet 2024

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1

Chang, Hsiang-Yu, Yu-Ting Tseng, Zhiqin Yuan, Hung-Lung Chou, Ching-Hsiang Chen, Bing-Joe Hwang, Meng-Che Tsai, Huan-Tsung Chang et Chih-Ching Huang. « The effect of ligand–ligand interactions on the formation of photoluminescent gold nanoclusters embedded in Au(i)–thiolate supramolecules ». Physical Chemistry Chemical Physics 19, no 19 (2017) : 12085–93. http://dx.doi.org/10.1039/c7cp01915g.

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Fernandez-Torrente, I., K. J. Franke, N. Henningsen, G. Schulze, M. Alemani, Ch Roth, R. Rurali, N. Lorente et J. I. Pascual. « Spontaneous Formation of Triptycene Supramolecules on Surfaces ». Journal of Physical Chemistry B 110, no 41 (octobre 2006) : 20089–92. http://dx.doi.org/10.1021/jp065149x.

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WAKITA, Masa-aki, et Masanori HASHIMOTO. « Supramolecules I. Bilayer Vesicle Formation of N-Octadecylchitosan. » KOBUNSHI RONBUNSHU 52, no 10 (1995) : 589–93. http://dx.doi.org/10.1295/koron.52.589.

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Subbotin, A., R. Stepanyan, M. Knaapila, O. Ikkala et G. ten Brinke. « Phase behavior and structure formation of hairy-rod supramolecules ». European Physical Journal E 12, no 2 (octobre 2003) : 333–45. http://dx.doi.org/10.1140/epje/i2003-10065-y.

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Wu, Jun, Zeyuan Yi, Xuemin Lu, Shuangshuang Chen et Qinghua Lu. « Formation and properties of liquid crystalline supramolecules with anisotropic fluorescence emission ». Polymer Chemistry 5, no 7 (2014) : 2567. http://dx.doi.org/10.1039/c3py01544k.

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Jiang, Qian, Nicolas Desbois, Shifa Wang et Claude P. Gros. « Recent developments in dipyrrin based metal complexes : Self-assembled nanoarchitectures and materials applications ». Journal of Porphyrins and Phthalocyanines 24, no 05n07 (mai 2020) : 646–61. http://dx.doi.org/10.1142/s1088424620300025.

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While dipyrrin-boron complexes (BODIPYs) and their derivatives have attracted much attention, dipyrrin-based metal complexes recently appeared as a novel luminescent material. So far, dipyrrin-metal complexes have been regarded as non-luminescent or weakly luminescent. Interestingly, introduction of steric hindrance at the meso-position and the development of heteroleptic complexes with proper frontier orbital ordering are two recent strategies that have been developed to improve their luminescent ability. Compared with BODIPYs, one of the distinctive advantages of dipyrrin-metal complexes is that they can form a series of self-assembled supramolecules and polymer assemblies via facile coordination reactions. In recent times, several supramolecular, coordination polymers and Metal-Organic Frameworks (MOFs) have been developed, [Formula: see text] by spontaneous coordination reactions between dipyrrin ligands and metal ions. As a novel luminescent material, dipyrrin-metal complexes have been applied in many fields. This review article summarizes recent developments in dipyrrin-metal complexes from the viewpoint of the improvement of luminescent ability, the formation of supramolecular and coordination polymers and their potential applications.
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Uenuma, Shuntaro, Kimika Endo, Norifumi L. Yamada, Hideaki Yokoyama et Kohzo Ito. « Polymer Brush Formation Assisted by the Hierarchical Self-Assembly of Topological Supramolecules ». ACS Applied Materials & ; Interfaces 13, no 50 (7 décembre 2021) : 60446–53. http://dx.doi.org/10.1021/acsami.1c18720.

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Koide, Takaki, Daisuke L. Homma, Shinichi Asada et Kouki Kitagawa. « Self-complementary peptides for the formation of collagen-like triple helical supramolecules ». Bioorganic & ; Medicinal Chemistry Letters 15, no 23 (décembre 2005) : 5230–33. http://dx.doi.org/10.1016/j.bmcl.2005.08.041.

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Kadokawa, Jun-ichi, Takuya Shoji et Kazuya Yamamoto. « Preparation of Amylose-Carboxymethyl Cellulose Conjugated Supramolecular Networks by Phosphorylase-Catalyzed Enzymatic Polymerization ». Catalysts 9, no 3 (26 février 2019) : 211. http://dx.doi.org/10.3390/catal9030211.

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Enzymatic polymerization has been noted as a powerful method to precisely synthesize polymers with complicated structures, such as polysaccharides, which are not commonly prepared by conventional polymerization. Phosphorylase is one of the enzymes which have been used to practically synthesize well-defined polysaccharides. The phosphorylase-catalyzed enzymatic polymerization is conducted using α-d-glucose 1-phosphate as a monomer, and maltooligosaccharide as a primer, respectively, to obtain amylose. Amylose is known to form supramolecules owing to its helical conformation, that is, inclusion complex and double helix, in which the formation is depended on whether a guest molecule is present or not. In this paper, we would like to report the preparation of amylose-carboxymethyl cellulose (CMC) conjugated supramolecular networks, by the phosphorylase-catalyzed enzymatic polymerization, using maltoheptaose primer-grafted CMC. When the enzymatic polymerization was carried out using the graft copolymer, either in the presence or in the absence of a guest polymer poly (ε-caprolactone) (PCL), the enzymatically elongated amylose chains from the primers on the CMC main-chain formed double helixes or inclusion complexes, depending on the amounts of PCL, which acted as cross-linking points for the construction of network structures. Accordingly, the reaction mixtures totally turned into hydrogels, regardless of the structures of supramolecular cross-linking points.
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Yu, Tao, Yun Wang, Dairen Lu, Ruke Bai et Weiqi Lu. « Synthesis of mid-dicarboxy polystyrene by ATRP and formation of ionic-bonded supramolecules ». Frontiers of Chemical Engineering in China 1, no 2 (mai 2007) : 140–45. http://dx.doi.org/10.1007/s11705-007-0026-4.

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Kadokawa, Jun-ichi. « Fabrication of Nanostructured Supramolecules through Helical Inclusion of Amylose toward Hydrophobic Polyester Guests, Biomimetically through Vine-Twining Polymerization Process ». Biomimetics 8, no 7 (1 novembre 2023) : 516. http://dx.doi.org/10.3390/biomimetics8070516.

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This review article presents the biomimetic helical inclusion of amylose toward hydrophobic polyesters as guests through a vine-twining polymerization process, which has been performed in the glucan phosphorylase (GP)-catalyzed enzymatic polymerization field to fabricate supramolecules and other nanostructured materials. Amylose, which is a representative abundant glucose polymer (polysaccharide) with left-handed helical conformation, is well known to include a number of hydrophobic guest molecules with suitable geometry and size in its cavity to construct helical inclusion complexes. Pure amylose is prepared through enzymatic polymerization of α-d-glucose 1-phosphate as a monomer using a maltooligosaccharide as a primer, catalyzed by GP. It is reported that the elongated amylosic chain at the nonreducing end in enzymatic polymerization twines around guest polymers with suitable structures and moderate hydrophobicity, which is dispersed in aqueous polymerization media, to form amylosic nanostructured inclusion complexes. As the image of this system is similar to how vines of a plant grow around a support rod, this polymerization has been named ‘vine-twining polymerization’. In particular, the helical inclusion behavior of the enzymatically produced amylose toward hydrophobic polyesters depending on their structures, e.g., chain lengths and substituents, has been systematically investigated in the vine-twining polymerization field. Furthermore, amylosic supramolecular network materials, such as hydrogels, are fabricated through vine-twining polymerization by using copolymers, where hydrophobic polyester guests or maltooligosaccharide primers are covalently modified on hydrophilic main-chain polymers. The vine-twining polymerization using such copolymers in the appropriate systems induces the formation of amylosic nanostructured inclusion complexes among them, which act as cross-linking points, giving rise to supramolecular networks at the nanoscale. The resulting materials form supramolecular hydrogels, films, and microparticles.
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Zhou, Xun-Hui, Ying Zeng, Shao-Bin Tang, Zi-Ru Yu, Li-Ming Cao, Zi-Yi Du et Chun-Ting He. « Solid solutions of flexible host–guest supramolecules for tuning molecular motion and phase transitions ». Chemical Communications 57, no 59 (2021) : 7292–95. http://dx.doi.org/10.1039/d1cc02061g.

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By utilizing supramolecular complex as a deformable/elastic substitutional component, we put forward a unique strategy for the formation of molecular solid solutions, which can modulate the molecular motion and phase transition in molecular solids.
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Du, Bo, Qing Wang, Congying Li et Hong Li. « Self-assembly of dumbbell-shaped supramolecules with simulated annealing and Monte Carlo simulation ». MATEC Web of Conferences 358 (2022) : 01027. http://dx.doi.org/10.1051/matecconf/202235801027.

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The self-assembly structures of dumbbell-shaped supramolecules are investigated using a simple sphere-rod-sphere (SRS) model. Through the simulated annealing Monte Carlo simulation under NVT condition, two variations of this model, i.e. the rigid/semi-rigid model, are compared by their order parameters. We found that, by varying the interactions of this SRS model, various nanostructures such as cross-linked networks, clusters phases, bundle-like nanowires and other order phases are discovered. The formation mechanism of these novel nanostructures is discussed.
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D'Souza, Francis, Suresh Gadde, Mohamed E. El-Khouly, Melvin E. Zandler, Yasuyaki Araki et Osamu Ito. « A supramolecular Star Wars Tie Fighter Ship : electron transfer in a self-assembled triad composed of two zinc naphthalocyanines and a fullerene ». Journal of Porphyrins and Phthalocyanines 09, no 10 (octobre 2005) : 698–705. http://dx.doi.org/10.1142/s1088424605000812.

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Photoactive supramolecules composed of electron donor and electron acceptor entities are important for light energy harvesting applications. In the present study, a Star Wars Tie Fighter Ship shaped supramolecular triad was constructed by self-assembling two zinc naphthalocyanines to a fulleropyrrolidine bearing two pyridine entities using an axial coordination approach. Optical absorption and emission studies revealed stable complex formation, and the experimentally determined free-energy change revealed the possibility of electron transfer from singlet excited zinc naphthalocyanine to the fulleropyrrolidine. The picosecond time-resolved emission technique was utilized to evaluate the kinetics of charge separation while nanosecond transient absorption spectral studies provided evidence for electron transfer quenching. The measured charge-separation rate, k CS and quantum yield, Φ CS were found to be 5.7 × 109 s −1 and 0.93 in toluene, respectively, indicating an efficient process within the supramolecular triad. The charge recombination rate (k CR ) of the supramolecular ion-pair calculated from the nanosecond transient absorption technique was found to be 3.5 × 107 s −1 yielding a lifetime for the radical ion-pair (τ RIP ) of about 30 ns. Changing the solvent from the noncoordinating toluene to the coordinating benzonitrile or THF destroyed the supramolecular structure, and under these experimental conditions, only intermolecular electron transfer from the triplet excited zinc naphthalocyanine to fulleropyrrolidine could be observed. Under these conditions, the measured electron transfer rates, k et , T inter , were found to be 2.6 × 107 M −1. s −1 in benzonitrile and 1.2 × 107 M −1. s −1 in THF, respectively.
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Bertuzzi, Sara, Ana Gimeno, Ane Martinez-Castillo, Marta G. Lete, Sandra Delgado, Cristina Airoldi, Marina Rodrigues Tavares et al. « Cross-Linking Effects Dictate the Preference of Galectins to Bind LacNAc-Decorated HPMA Copolymers ». International Journal of Molecular Sciences 22, no 11 (1 juin 2021) : 6000. http://dx.doi.org/10.3390/ijms22116000.

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The interaction of multi-LacNAc (Galβ1-4GlcNAc)-containing N-(2-hydroxypropyl) methacrylamide (HPMA) copolymers with human galectin-1 (Gal-1) and the carbohydrate recognition domain (CRD) of human galectin-3 (Gal-3) was analyzed using NMR methods in addition to cryo-electron-microscopy and dynamic light scattering (DLS) experiments. The interaction with individual LacNAc-containing components of the polymer was studied for comparison purposes. For Gal-3 CRD, the NMR data suggest a canonical interaction of the individual small-molecule bi- and trivalent ligands with the lectin binding site and better affinity for the trivalent arrangement due to statistical effects. For the glycopolymers, the interaction was stronger, although no evidence for forming a large supramolecule was obtained. In contrast, for Gal-1, the results indicate the formation of large cross-linked supramolecules in the presence of multivalent LacNAc entities for both the individual building blocks and the polymers. Interestingly, the bivalent and trivalent presentation of LacNAc in the polymer did not produce such an increase, indicating that the multivalency provided by the polymer is sufficient for triggering an efficient binding between the glycopolymer and Gal-1. This hypothesis was further demonstrated by electron microscopy and DLS methods.
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Tsivadze, Aslan Yu, Galina V. Ionova, V. K. Mikhalko et Yu N. Kostrubov. « Thermodynamics and mechanisms of the formation of supramolecules and supramolecular assemblies of s, p, d and f elements : problems and prospects ». Russian Chemical Reviews 76, no 3 (31 mars 2007) : 213–33. http://dx.doi.org/10.1070/rc2007v076n03abeh003628.

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Park, Yu Jin, Ji Yeon Ryu, Halima Begum, Min Hyung Lee, Peter J. Stang et Junseong Lee. « Selective Formation of Heterometallic Ru–Ag Supramolecules via Stoichiometric Control of Multiple Different Tectons ». Journal of the American Chemical Society 137, no 18 (4 mai 2015) : 5863–66. http://dx.doi.org/10.1021/jacs.5b01253.

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Frischmann, Peter D., Glenn A. Facey, Phuong Y. Ghi, Amanda J. Gallant, David L. Bryce, Francesco Lelj et Mark J. MacLachlan. « Capsule Formation, Carboxylate Exchange, and DFT Exploration of Cadmium Cluster Metallocavitands : Highly Dynamic Supramolecules ». Journal of the American Chemical Society 132, no 11 (24 mars 2010) : 3893–908. http://dx.doi.org/10.1021/ja910419h.

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NIWA, Masazo, Takeshi SHINTANI et Nobuyuki HIGASHI. « Supramolecules I. Formation of a Supra-Molecular Structure by Redox-Polymerization of Surface Monolayers. » KOBUNSHI RONBUNSHU 52, no 10 (1995) : 662–65. http://dx.doi.org/10.1295/koron.52.662.

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Barberá, Joaquín, Laura Puig, Pilar Romero, José Luis Serrano et Teresa Sierra. « Strict Steric Requirements for the Formation of Helical Mesophases Consisting of H-Bonded Supramolecules ». Chemistry of Materials 17, no 14 (juillet 2005) : 3763–71. http://dx.doi.org/10.1021/cm050361j.

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Vilaplana, Rosario A., Francisco González-Vílchez et Robert F. Pasternack. « Formation of supramolecules in solution. Interaction between transition-metal complexes and water-soluble porphyrins ». J. Chem. Soc., Dalton Trans., no 7 (1991) : 1831–34. http://dx.doi.org/10.1039/dt9910001831.

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Higashi, Taishi, Haruki Tanaka, Ayumi Yoshimatsu, Haruna Ikeda, Kanako Arima, Masatoshi Honjo, Chihiro Iwamoto, Keiichi Motoyama et Hidetoshi Arima. « Improvement of Pharmaceutical Properties of Isoprenoid Compounds through the Formation of Cyclodextrin Pseudorotaxane-Like Supramolecules ». Chemical and Pharmaceutical Bulletin 64, no 4 (2016) : 340–45. http://dx.doi.org/10.1248/cpb.c15-00931.

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Pi, Wenmin, Nana Han, Linying Wu, Xiang Zhang, Xuemei Huang, Zhijia Wang, Zhihua Yuan et Penglong Wang. « Discovery, traceability, formation mechanism, metal and organic components analysis of supramolecules from Maxing Shigan decoction ». Journal of Pharmaceutical and Biomedical Analysis 234 (septembre 2023) : 115532. http://dx.doi.org/10.1016/j.jpba.2023.115532.

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Kobuke, Yoshiaki. « Porphyrin supramolecules by complementary coordination for units constructing photosynthetic systems ». Journal of Porphyrins and Phthalocyanines 08, no 02 (février 2004) : 156–74. http://dx.doi.org/10.1142/s1088424604000155.

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Among unique structural arrangements provided by nature, special pair and macroring antenna complexes in bacterial photosynthetic systems have been mimicked by simple organization of choromophores. The special pair was mimicked by imidazolyl-substituted porphyrinatozinc which gave a complementary coordination dimer of slipped cofacial orientation with an extremely large stability constant of 1010 M-1 in CHCl 3. When two imidazolylporphyrinatozinc units were linked directly at the meso positions, linear and continuous growth of the complementary coordination lead to porphyrin arrays of a few hundreds nanometer scale, corresponding to molecular weights of a few 105. At the same time, the porphyrin array could be dissociated into the monomeric unit by competitive coordination of solvents. This provided a way of terminating or initiating the oligomeric porphyrin array with appropriate chain terminals/initiators. Two imidazolylporphyrinatozinc complexes were then linked by a m-phenylene unit with an angle of 120°. The linear and macrocyclic oligomer mixtures initially obtained were converged smoothly by reorganization equilibrium into a mixture of hexameric and pentameric macrocycles under high-dilution conditions. The ring mimicked the structure and function of the light harvesting complexes of bacterial photosynthetic systems. The covalent linking of coordination organized porphyrins was also developed to maintain the structure even in highly coordinating solvents such as pyridine. The linear array formation and the facile introduction of specific terminal/initiator groups by complementary coordination were then applied to introduce antenna function onto solar cell. Through thiolate attachment on a gold surface, imidazolylporphyrinatozinc initiated the growth of meso-meso linked porphyrin arrays by successive complementary coordination. This methodology improved the efficiency of absorption of incident photon and increased significantly the total photocurrent generation efficiency.
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Zhang, Jian-Jun, Sergio Aarón Gamboa, Barry Julian Davis et Abdessadek Lachgar. « Self-Assembly of Cluster-Based Nanoscopic Supramolecules into One-Dimensional Coordination Polymers ». Advances in Materials Science and Engineering 2009 (2009) : 1–11. http://dx.doi.org/10.1155/2009/579123.

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Octahedral metal clusters[Nb6Cl12(CN)6]4−,(Mn(Salen))+(or(Mn(7-MeSalen))+) (Salen=N,N′-ethylene-bis-(salicylidene)iminate) and ditopic organic linkers (4,4′-bpe(trans-1, 2-bis(4-pyridyl)-ethylene) or4,4′-dpyo(4,4′-dipyridylN,N′-dioxide)) self-assemble to form three cluster-based 1D coordination polymers:[Mn(Salen)(MeOH)2]2{(4,4′-dpyo)[(Mn(Salen))2(Nb6Cl12(CN)6)]}·2MeOH(1),{(4,4′-bpe)[(Mn(7-MeSalen))2(Mn(7-MeSalen)(H2O))2(Nb6Cl12(CN)6)]}·1.5MeCN·8H2O(2), and[(4,4′-bpe)(Mn(Salen)(H2O))2]{(4,4′-bpe)2[(Mn(Salen)(MeOH))2(Mn(Salen))2(Nb6Cl12(CN)6)][(Mn(Salen))2(Nb6Cl12(CN)6)]}·16H2O(3). Single crystal X-ray diffraction analyses show that the frameworks of the three coordination polymers are built of heterotrimeric and/or heteropentameric supramolecular species linked by ditopic organic ligands. The framework of1consists of anionic chains built of heterotrimeric dianions[(Mn(Salen))2(Nb6Cl12(CN)6)]2−(T) linked by4,4′-dpyo. The chains run along two directions ([0 2 −2] and [0 3 3]) leading to the formation of channels along the crystallographic (a) direction where the cations [Mn(Salen)(S)2]+and solvent molecules are located. Also,2was reported earlier, it possesses a neutral 1D chain built of neutral heterpentameric supramolecules:[(Mn(7‐MeSalen))2(Mn(7‐MeSalen)(S))2(Nb6Cl12(CN)6)](P) linked by4,4′-bpeligands. Hydrogen bonds between non-bridging cyanide ligands and coordinated solvent molecules connect the chains into 2D hydrogen-bonded frameworks. Finally,3features an anionic chain, built of alternating heterotrimers[(Mn(Salen))2(Nb6Cl12(CN)6)]2−and heteropentamers[(Mn(Salen)(S))2(Mn(Salen))2(Nb6Cl12(CN)6)]linked by the organic spacer4,4′-bpe. The anionic charge is compensated by the in situe-assembled[Mn(Salen)(S)(4,4′‐bpe)Mn(Salen)(S)]2+dimers. Magnetic measurements reveal that the Mn(III) ions are well isolated and only weak magnetic interactions are observed. The thermal stability of the three compounds was investigated.
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Hiroshige, Seina, Takuma Kureha, Daichi Aoki, Jun Sawada, Daisuke Aoki, Toshikazu Takata et Daisuke Suzuki. « Formation of Tough Films by Evaporation of Water from Dispersions of Elastomer Microspheres Crosslinked with Rotaxane Supramolecules ». Chemistry - A European Journal 23, no 35 (5 juin 2017) : 8405–8. http://dx.doi.org/10.1002/chem.201702077.

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Wei, Ming-Hsin, Boyu Li, R. L. Ameri David, Simon C. Jones, Virendra Sarohia, Joel A. Schmitigal et Julia A. Kornfield. « Megasupramolecules for safer, cleaner fuel by end association of long telechelic polymers ». Science 350, no 6256 (1 octobre 2015) : 72–75. http://dx.doi.org/10.1126/science.aab0642.

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We used statistical mechanics to design polymers that defy conventional wisdom by self-assembling into “megasupramolecules” (≥5000 kg/mol) at low concentration (≤0.3 weight percent). Theoretical treatment of the distribution of individual subunits—end-functional polymers—among cyclic and linear supramolecules (ring-chain equilibrium) predicts that megasupramolecules can form at low total polymer concentration if, and only if, the backbones are long (>400 kg/mol) and end-association strength is optimal. Viscometry and scattering measurements of long telechelic polymers having polycyclooctadiene backbones and acid or amine end groups verify the formation of megasupramolecules. They control misting and reduce drag in the same manner as ultralong covalent polymers. With individual building blocks short enough to avoid hydrodynamic chain scission (weight-average molecular weights of 400 to 1000 kg/mol) and reversible linkages that protect covalent bonds, these megasupramolecules overcome the obstacles of shear degradation and engine incompatibility.
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Banerjee, Shibdas, et Shyamalava Mazumdar. « Electrospray Ionization Mass Spectrometry : A Technique to Access the Information beyond the Molecular Weight of the Analyte ». International Journal of Analytical Chemistry 2012 (2012) : 1–40. http://dx.doi.org/10.1155/2012/282574.

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The Electrospray Ionization (ESI) is a soft ionization technique extensively used for production of gas phase ions (without fragmentation) of thermally labile large supramolecules. In the present review we have described the development of Electrospray Ionization mass spectrometry (ESI-MS) during the last 25 years in the study of various properties of different types of biological molecules. There have been extensive studies on the mechanism of formation of charged gaseous species by the ESI. Several groups have investigated the origin and implications of the multiple charge states of proteins observed in the ESI-mass spectra of the proteins. The charged analytes produced by ESI can be fragmented by activating them in the gas-phase, and thus tandem mass spectrometry has been developed, which provides very important insights on the structural properties of the molecule. The review will highlight recent developments and emerging directions in this fascinating area of research.
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IHARA, Hirotaka, Ken SHUDO, Makoto TAKAFUJI, Chuichi HIRAYAMA, Hiroshi HACHISAKO et Kimiho YAMADA. « Supramolecules I. Functional Oraganic Gels. Formation of Chiral Gels from L-Glutamic Acid-Derived Lipids and Their Chiral Recognition Ability. » KOBUNSHI RONBUNSHU 52, no 10 (1995) : 606–14. http://dx.doi.org/10.1295/koron.52.606.

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Huynh, Khon C., Huong T. T. Nguyen, Volker R. Stoldt, Marianna Gyenes et Rudiger E. Scharf. « Shear-Induced Fibrillar-like Supramolecules of Plasma Fibronectin : A New Form of Fibronectin with Enhanced Activity in Platelet Adhesion and Aggregation ». Blood 124, no 21 (6 décembre 2014) : 4174. http://dx.doi.org/10.1182/blood.v124.21.4174.4174.

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Abstract Introduction: Plasma fibronectin (FN) is synthesized by hepatocytes and secreted into the circulation in a soluble, compact and non-fibrillar form. Plasma FN is assembled by cells or adherent platelets into functional fibrils. Reports have indicated that the process to incorporate FN into multimer fibrils can also occur in cell-free models in vitro by incubation with denaturants, reducing agents, or anastellin (FN peptidic fragment). Here, we report on (1) the formation of insoluble fibrillar-like supramolecules of plasma FN (FN fibrils) by exposing the molecules to increasing shear rates and (2) the functional characterization in platelet adhesion and aggregation. Methods: To induce the formation of FN fibrils, 1 ml of plasma FN solution (100 μg/ml) was added to plates pre-coated with FN (100 μg/ml). Subsequently, the FN solutions were exposed to shear (50 to 5000 s-1 within 5 min and subsequently 5000 to 50 s-1 within 5 min) generated by a cone-plate rheometer (Haaka Rheostress 1; Thermo Scientific). Viscosities of FN solutions were recorded. To quantify the formation of FN fibrils, FN solutions after exposure to shear were collected and incubated with 2% deoxycholate (DOC). The DOC-insoluble pellets containing FN fibrils were isolated by centrifugation at 19,000 g for 20 min at 4°C and resuspended in 1% SDS buffer for Western blot analyses. For adhesion experiments, washed platelets (107/ml) in HEPES Tyrode’s buffer were labeled with 10 μM 5-chloromethylfluorescein diacetate and placed on 96-well plates pre-coated with FN or FN fibrils (25 µg/ml) for 30 min at 37°C. In parallel experiments, platelets resuspended in FN-depleted plasma (107/ml) were placed onto immobilized collagen, fibrinogen, FN (10 µg/ml) in the presence of FN (300 µg/ml) or FN fibrils (10 µg/ml). For aggregation experiments, FN (5, 10, 300 µg/ml) or FN fibrils (5, 10 µg/ml) was added to platelet-rich plasma (PRP) or platelets resuspended in FN-depleted plasma (2.5 × 108/ml). Aggregation was induced by 400 nM PMA (Phorbol 12-myristate 13-acetate), or 10 µg/ml collagen. Results: The initial viscosities (mPa's) of FN solutions were 7.62 ± 0.98. Upon exposure to dynamic shear for 10 min, viscosities increased to 10.98 ± 1.81 (p = 0.02, n = 4), suggesting conformational changes of FN. Western blot analyses of DOC-insoluble fractions revealed bands of FN in the range of 220 – 250 kDa (reducing condition), indicative of the formation of insoluble fibrils in FN solutions after exposure to shear. Platelet adhesion and aggregation experiments were performed to compare the activity of FN fibrils with normal plasma FN. For adhesion experiments, washed platelets in HEPES Tyrode’s buffer were placed onto immobilized FN or FN fibrils (25 µg/ml). The adhesion rates (mean fluorescence signal ± SD) of washed platelets were higher onto surfaces coated with FN fibrils (0.5 ± 0.06) than onto surfaces coated with plasma FN (0.4 ± 0.01) (p = 0.04, n = 3). In parallel adhesion experiments using platelets resuspended in FN-depleted plasma, addition of plasma FN (300 µg/ml) increased platelet adhesion rates onto immobilized collagen (from 0.14 ± 0.005 to 0.2 ± 0.01, p = 0.0007), fibrinogen (from 0.16 ± 0.03 to 0.22 ± 0.01, p = 0.03), and FN (from 0.14 ± 0.01 to 0.18 ± 0.02, p = 0.04) (n = 3). Addition of FN fibrils at low concentration of 10 µg/ml had a similar supportive effect. FN showed an inhibitory effect in platelet aggregation. Activation by 400 nM PMA induced aggregation of PRP by 81% (amplitude). In the presence of plasma FN at 5, 10, 300 µg/ml, platelet aggregation was reduced to 50 %, 41 %, and 29.5 %, respectively. A stronger inhibition on platelet aggregation was seen when FN fibrils were added. PRP aggregated by 35.4 % and 17 % in the presence of 5 and 10 µg/ml FN fibrils, respectively. The same phenomenon was observed in aggregation assays using platelets resuspended in FN-depleted plasma and collagen (10 µg/ml) as activating agonist. Conclusion: Our study shows that dynamic shear rates induce the formation of insoluble fibrillar-like form of plasma FN in cell-free model in vitro. Fibril formation of FN can be monitored by measuring viscosities of FN solutions during exposure to shear and quantified by Western blot. Shear-induced formed FN fibrils have an explicitly stronger activity in supporting platelet adhesion and inhibiting platelet aggregation than normal plasma FN. This finding emphasizes the importance of FN assembly on its activity in platelet functions. Disclosures No relevant conflicts of interest to declare.
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31

Alexander, Daniel, Petr Holý, Pavel Fiedler, Zdeněk Havlas et Jiří Závada. « Symmetrical Tris(4,6-diamino-5-methylene-2-pyrimidones) : New Building Blocks for Self-Assembly of Hollow Spherical Supramolecules Locked by Hydrogen Bonds ». Collection of Czechoslovak Chemical Communications 61, no 10 (1996) : 1464–72. http://dx.doi.org/10.1135/cccc19961464.

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Concise synthesis of the tris(pyrimidones) 1a,b is described. Molecular modeling study demonstrated that both the prepared models 1a,b are capable of self-assembling under formation of spherical dimers locked by 18 hydrogen bonds. Extreme insolubility in all common solvents precluded investigation of the self-assembly in solution. Circumstantial evidence in favor of the self-assembly has been provided in the solid and gas phase.
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Zhang, Xiwen, Xueming Lian, Li Liu, Jian Zhang et Hanying Zhao. « Synthesis of Comb Copolymers with Pendant Chromophore Groups Based on RAFT Polymerization and Click Chemistry and Formation of Electron Donor−Acceptor Supramolecules ». Macromolecules 41, no 21 (11 novembre 2008) : 7863–69. http://dx.doi.org/10.1021/ma801405j.

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Tamiaki, Hitoshi, Takashi Nishiyama et Reiko Shibata. « Self-aggregation of zinc chlorophylls possessing perfluoroalkyl chains in fluorous solvents : Selective extraction of the self-aggregates with fluorous phase and accelerated formation of the ordered supramolecules in this phase ». Bioorganic & ; Medicinal Chemistry Letters 17, no 7 (avril 2007) : 1920–23. http://dx.doi.org/10.1016/j.bmcl.2007.01.044.

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34

Barata, Patrícia D., Alexandra I. Costa, Sérgio Costa et José V. Prata. « Fluorescent Bis-Calix[4]arene-Carbazole Conjugates : Synthesis and Inclusion Complexation Studies with Fullerenes C60 and C70 ». Molecules 26, no 16 (18 août 2021) : 5000. http://dx.doi.org/10.3390/molecules26165000.

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Supramolecular chemistry has become a central theme in chemical and biological sciences over the last decades. Supramolecular structures are being increasingly used in biomedical applications, particularly in devices requiring specific stimuli-responsiveness. Fullerenes, and supramolecular assemblies thereof, have gained great visibility in biomedical sciences and engineering. Sensitive and selective methods are required for the study of their inclusion in complexes in various application fields. With this in mind, two new fluorescent bis-calix[4]arene-carbazole conjugates (4 and 5) have been designed. Herein, their synthesis and ability to behave as specific hosts for fullerenes C60 and C70 is described. The optical properties of the novel compounds and their complexes with C60 and C70 were thoroughly studied by UV-Vis and steady-state and time-resolved fluorescence spectroscopies. The association constants (Ka) for the complexation of C60 and C70 by 4 and 5 were determined by fluorescence techniques. A higher stability was found for the C70@4 supramolecule (Ka = 5.6 × 104 M−1; ΔG = −6.48 kcal/mol). Evidence for the formation of true inclusion complexes between the host 4 and C60/C70 was obtained from NMR spectroscopy performed at low temperatures. The experimental findings were fully corroborated by density functional theory (DFT) models performed on the host–guest assemblies (C60@4 and C70@4).
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Takeshita, Michinori, Miyuki Hayashi, Souichi Kadota, Kamrul Hossain Mohammed et Takehiko Yamato. « Photoreversible supramolecular polymer formation ». Chemical Communications, no 6 (2005) : 761. http://dx.doi.org/10.1039/b415114c.

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Wang, Hui, Xin Du, Yuanyuan Liu, Xingjiang Liu, Ailing Sun, Liuhe Wei et Yuhan Li. « An Environmentally Friendly Supramolecular Glue Developed from Natural 3,4-Dihydroxybenzaldehyde ». Polymers 14, no 5 (25 février 2022) : 916. http://dx.doi.org/10.3390/polym14050916.

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Liquid adhesive suffers from the emission of volatile organic compounds (VOCs) that have detrimental effects on human beings. Herein, an environmentally friendly glue containing a novel supramolecule dissolved in non-toxic ethanol is developed. Poly (ether amine) (PEA) and 3,4-dihydroxybenzaldehyde (dhba) is utilized to synthesize catechol-terminated PEA, and subsequent complexation by Fe3+ results in the supramolecular component (PEA-dhba-Fe3+). The Fourier transform infrared (FTIR) spectrum together with the UV-vis spectrum reveal the existence of quinone converted from catechol. Raman spectra prove the existence of a successful complex of catechol-terminated PEA with Fe3+. The tri-complex is found to be the predominant mode and can successfully form into clusters, serving as a physical cross-linking network. The PEA-dhba-Fe3+ exhibits strong adherence to metal substrates compared to polymeric substrates, with its shear strength reaching as high as 1.36 ± 0.14 MPa when the pH of the glue is adjusted to 8. The obvious improvement of adhesion originates from the formation of interfacial coordination bonds between quinone/catechol and metal atoms, as well as their cations, as revealed by X-ray photoelectron spectroscopy (XPS) and theoretical calculations. With consideration of its merits, including strong adhesion and the minor emission of VOCs compared to commercial epoxy and acrylic adhesives, this environmentally friendly supramolecular glue has a range of cutting-edge applications as an adhesive for metal substrates.
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Park, Jae-Hyeon, Min-Hye Kim, Moo-Lyong Seo, Ji-Ha Lee et Jong-Hwa Jung. « In Situ Supramolecular Gel Formed by Cyclohexane Diamine with Aldehyde Derivative ». Polymers 14, no 3 (20 janvier 2022) : 400. http://dx.doi.org/10.3390/polym14030400.

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Low-molecular-weight gels have great potential for use in a variety of fields, including petrochemicals, healthcare, and tissue engineering. These supramolecular gels are frequently metastable, implying that their properties are kinetically controlled to some extent. Here, we report on the in situ supramolecular gel formation by mixing 1,3-cyclohexane diamine (1) and isocyanate derivative (2) without any catalysis at room temperature in various organic solvents. A mixture of building blocks 1 and 2 in various organic solvents, dichloromethane, tetrahydrofuran, chloroform, toluene, and 1,4-dioxane, resulted in the stable formation of supramolecular gel at room temperature within 60–100 s. This gel formation was caused by the generation of urea moieties, which allows for the formation of intermolecular hydrogen-bonding interactions via reactions 1 and 2. In situ supramolecular gels demonstrated a typical entangled fiber structure with a width of 600 nm and a length of several hundred μm. In addition, the supramolecular gels were thermally reversible by heating and cooling. The viscoelastic properties of supramolecular gels in strain and frequency sweets were enhanced by increasing the concentration of a mixed 1 and 2. Furthermore, the supramolecular gels displayed a thixotropic effect, indicating a thermally reversible gel.
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38

Yang, Z., H. Gu, D. Fu, P. Gao, J. K. Lam et B. Xu. « Enzymatic Formation of Supramolecular Hydrogels ». Advanced Materials 16, no 16 (18 août 2004) : 1440–44. http://dx.doi.org/10.1002/adma.200400340.

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Yang, Z., H. Gu, D. Fu, P. Gao, J. K. Lam et B. Xu. « Enzymatic Formation of Supramolecular Hydrogels ». Advanced Materials 18, no 5 (3 mars 2006) : 545. http://dx.doi.org/10.1002/adma.200690020.

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Lin, Nai-Bo, You-Hui Lin, Qiao-Ling Huang et Xiang-Yang Liu. « Supramolecular gels and mesoscopic structure ». International Journal of Modern Physics B 32, no 18 (15 juillet 2018) : 1840015. http://dx.doi.org/10.1142/s0217979218400155.

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From the perspective of mesoscale, the formation mechanism of crystal network structure of supramolecular gel, the influence of structure on macroscopic properties, and the design and control of supramolecular gels are reviewed. Crystal network is a key character of the hierarchical structure of the gel, the formations of the basic and multi-level crystal networks are based on the crystal nucleation and growth. The engineering and controlling of the gel structure can be implemented by various stimuli, such as additives, sonication, seeding and thermodynamic driving force, which leads to a controllable performance of the gel. In addition, the methods of characterizing supramolecular gels are systematically summarized, such as rheology, atomic force microscope, scanning tunnel microscope, scanning electron microscope, transmission electron microscope, polarizing optical microscope, X-ray diffraction (XRD), small-angle X-ray scattering, small angle neutron scattering, nuclear magnetic resonance spectroscopy, dynamic light scattering (DLS), etc. Supramolecular gel performance is determined by the hierarchy mesoscopic structures, which can significantly improve the properties of the material. Four factors can be correlated to the structure and performance of material: topology, correlation length, symmetry/ordering and strength of association of crystal networks. According to the more in-depth understanding of mesoscopic supramolecular gels, the research and development of such a material will be pushed to a new stage.
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Gangopadhyay, P., et T. P. Radhakrishnan. « Visualizing Supramolecular Macrocyclic Formations ». Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 369, no 1 (1 octobre 2001) : 167–219. http://dx.doi.org/10.1080/10587250108030019.

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Kida, Toshiyuki, Ayumi Teragaki, Justine M. Kalaw et Hajime Shigemitsu. « Supramolecular organogel formation through three-dimensional α-cyclodextrin nanostructures : solvent chirality-selective organogel formation ». Chemical Communications 56, no 55 (2020) : 7581–84. http://dx.doi.org/10.1039/d0cc02112a.

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Nabeshima, Tatsuya, et Masaki Yamamura. « Cooperative formation and functions of multimetal supramolecular systems ». Pure and Applied Chemistry 85, no 4 (1 janvier 2013) : 763–76. http://dx.doi.org/10.1351/pac-con-12-08-02.

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Multimetal complexes provide a variety of interesting structures, unique properties, and functions. Such sophisticated functions are often produced by synergistic and cooperative interactions among the metal ions accumulated in the restricted small area of the multimetal systems. We describe novel three strategies (i.e., macrocyclic, C-shape, and multimetal template) for the preparation of the multimetal supramolecular systems by the cooperative metal binding of a multi-Schiff-base and multi-oxime ligands, and their characteristic structures and functions. The three approaches are versatile and effective because the employed coordination reactions smoothly and quickly proceeded under mild conditions to quantitatively form the desired coordination structures. The multimetal supramolecular systems obtained here exhibit the synergistic and cooperative functions for ion recognition, magnetic properties, helicity control, and modulation of reaction selectivity. These types of multimetal complexes could be developed for a cascade functional supramolecular system that shows highly synergistic properties, integrated multifunctions, and function amplification.
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Miyawaki, Atsuhisa, Masahiko Miyauchi, Yoshinori Takashima, Hiroyasu Yamaguchi et Akira Harada. « Formation of supramolecular isomers ; poly[2]rotaxane and supramolecular assembly ». Chem. Commun., no 4 (2008) : 456–58. http://dx.doi.org/10.1039/b713588b.

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45

Hartendorp, Arnout P. T., Felix J. de Zwart, Hans Bieräugel, Bas de Bruin, Joost N. H. Reek et Jan H. van Maarseveen. « Peptide cyclisation promoted by supramolecular complex formation ». Organic & ; Biomolecular Chemistry 20, no 3 (2022) : 575–78. http://dx.doi.org/10.1039/d1ob02309h.

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46

Tamaki, Kenta, Takumi Aizawa et Shiki Yagai. « Wavy supramolecular polymers formed by hydrogen-bonded rosettes ». Chemical Communications 57, no 39 (2021) : 4779–82. http://dx.doi.org/10.1039/d1cc01636a.

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A novel barbiturate-functionalized supramolecular monomer provides unprecedented wavy supramolecular polymers with periodic inversion of curvature domains via the formation of hydrogen-bonded rosettes.
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47

Vyborna, Y., S. Altunbas, M. Vybornyi et R. Häner. « Morphological diversity of supramolecular polymers of DNA-containing oligopyrenes – formation of chiroptically active nanosheets ». Chemical Communications 53, no 89 (2017) : 12128–31. http://dx.doi.org/10.1039/c7cc07511a.

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Supramolecular polymerization of chimeric DNA-pyrene oligomers leads to 1D and 2D objects depending on the length of the DNA. A single guanosine induces supramolecular chirality in the self-assembled nanosheets.
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Kobayashi, Yuichiro, Akira Harada et Hiroyasu Yamaguchi. « Supramolecular complex formation of polysulfide polymers and cyclodextrins ». Chemical Communications 56, no 88 (2020) : 13619–22. http://dx.doi.org/10.1039/d0cc06571d.

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49

Bellotto, Ottavia, Maria C. Cringoli, Siglinda Perathoner, Paolo Fornasiero et Silvia Marchesan. « Peptide Gelators to Template Inorganic Nanoparticle Formation ». Gels 7, no 1 (2 février 2021) : 14. http://dx.doi.org/10.3390/gels7010014.

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The use of peptides to template inorganic nanoparticle formation has attracted great interest as a green route to advance structures with innovative physicochemical properties for a variety of applications that range from biomedicine and sensing, to catalysis. In particular, short-peptide gelators offer the advantage of providing dynamic supramolecular environments for the templating effect on the formation of inorganic nanoparticles directly in the resulting gels, and ideally without using further reductants or chemical reagents. This mini-review describes the recent progress in the field to outline future research directions towards dynamic functional materials that exploit the synergy between supramolecular chemistry, nanoscience, and the interface between organic and inorganic components for advanced performance.
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Nelli, Srinivasa Rao, Jhong-Hua Lin, Thi Ngoc Anh Nguyen, Dion Tzu-Huan Tseng, Satish Kumar Talloj et Hsin-Chieh Lin. « Influence of amino acid side chains on the formation of two component self-assembling nanofibrous hydrogels ». New Journal of Chemistry 41, no 3 (2017) : 1229–34. http://dx.doi.org/10.1039/c6nj02820a.

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