Relevant bibliographies by topics / Amphiphilic polymers

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Amphiphilic polymers'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Amphiphilic polymers"

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Lombardo, Domenico, Mikhail A. Kiselev, Salvatore Magazù, and Pietro Calandra. "Amphiphiles Self-Assembly: Basic Concepts and Future Perspectives of Supramolecular Approaches." Advances in Condensed Matter Physics 2015 (2015): 1–22. http://dx.doi.org/10.1155/2015/151683.

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Amphiphiles are synthetic or natural molecules with the ability to self-assemble into a wide variety of structures including micelles, vesicles, nanotubes, nanofibers, and lamellae. Self-assembly processes of amphiphiles have been widely used to mimic biological systems, such as assembly of lipids and proteins, while their integrated actions allow the performance of highly specific cellular functions which has paved a way for bottom-up bionanotechnology. While amphiphiles self-assembly has attracted considerable attention for decades due to their extensive applications in material science, drug and gene delivery, recent developments in nanoscience stimulated the combination of the simple approaches of amphiphile assembly with the advanced concept of supramolecular self-assembly for the development of more complex, hierarchical nanostructures. Introduction of stimulus responsive supramolecular amphiphile assembly-disassembly processes provides particularly novel approaches for impacting bionanotechnology applications. Leading examples of these novel self-assembly processes can be found, in fact, in biosystems where assemblies of different amphiphilic macrocomponents and their integrated actions allow the performance of highly specific biological functions. In this perspective, we summarize in this tutorial review the basic concept and recent research on self-assembly of traditional amphiphilic molecules (such as surfactants, amphiphile-like polymers, or lipids) and more recent concepts of supramolecular amphiphiles assembly which have become increasingly important in emerging nanotechnology.
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Kohut, Ananiy, Andriy Voronov, and Stanislav Voronov. "Monomolecular Micelles Based on Amphiphilic Invertible Polymers." Chemistry & Chemical Technology 7, no. 3 (September 25, 2013): 261–71. http://dx.doi.org/10.23939/chcht07.03.261.

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Kugimoto, Daisuke, Aoi Taniguchi, Masaki Kinoshita, and Isamu Akiba. "Effect of Molecular Architecture on Associating Behavior of Star-Like Amphiphilic Polymers Consisting of Plural Poly(ethylene oxide) and One Alkyl Chain." Polymers 13, no. 3 (January 31, 2021): 460. http://dx.doi.org/10.3390/polym13030460.

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Associating behavior of star-like amphiphilic polymers consisting of two or three poly(ethylene oxide) (PEO) chains and one stearyl chain (C18) was investigated. Although the aggregation number (Nagg) of linear analogue of amphiphilic polymers monotonically decreased with increasing number-average molecular weight of PEO (Mn,PEO), the Nagg of micelles of star-like amphiphilic polymers with Mn,PEO = 550 g/mol was smaller than that with Mn,PEO = 750 g/mol, whereas that with Mn,PEO ≥ 750 g/mol showed general Mn,PEO dependence. Small-angle X-ray scattering analyses revealed that the occupied area of one PEO chain on the interface between hydrophobic core and corona layer in the micelles of star-like polymers was much narrower than that in the linear amphiphilic polymers. This result indica ted the PEO chains of star-like polymers partially took unfavorable conformation near the core–corona interface in polymer micelles. The effect of local conformation of PEO chains near the interface on the associating behavior became significant as Mn,PEO decreased. Therefore, in polymer micelles of star-like amphiphilic polymers containing PEO with Mn,PEO = 550 g/mol, the enlargement of occupied area of PEO on the core–corona interface should be caused to avoid the formation of unfavorable conformations of partial PEO chains, resulting in a decrease in Naggs.
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Demchuk, Zoriana, Mariya Savka, Andriy Voronov, Olga Budishevska, Volodymyr Donchak, and Stanislav Voronov. "Amphiphilic Polymers Containing Cholesterol for Drug Delivery Systems." Chemistry & Chemical Technology 10, no. 4s (December 25, 2016): 561–70. http://dx.doi.org/10.23939/chcht10.04si.561.

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The interaction of binary copolymers poly(maleic anhydride-co-poly(ethylene glycol) methyl ether methacrylate) with cholesterol results in formation of cholesterol containing polymers, which contain from 4.6 to 46.0 mol % monocholesteryl maleic links. Their structure was confirmed using functional analysis and IR spectroscopy. Acidic and anhydride links of these copolymers form polymeric salts if react with alkali. These salts are surfactants which in aqueous medium form a hierarchy micelles and micellar aggregates depending on the copolymer concentration. Using conductometry it was found that preferably monomolecular micelles are formed in dilute solutions, and micellar aggregates begin to form at higher concentrations. In aqueous media polymeric salts are able to solubilize such lipophilic substances as Sudan III dye and anticancer drug curcumin. Efficiency of solubilization towards Sudan III grows if the content of monocholesteryl maleic fragment in surfactant increases.
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Kancharla, Samhitha, Nathan A. Zoyhofski, Lucas Bufalini, Boris F. Chatelais, and Paschalis Alexandridis. "Association between Nonionic Amphiphilic Polymer and Ionic Surfactant in Aqueous Solutions: Effect of Polymer Hydrophobicity and Micellization." Polymers 12, no. 8 (August 15, 2020): 1831. http://dx.doi.org/10.3390/polym12081831.

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The interaction in aqueous solutions of surfactants with amphiphilic polymers can be more complex than the surfactant interactions with homopolymers. Interactions between the common ionic surfactant sodium dodecyl sulfate (SDS) and nonionic amphiphilic polymers of the poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO-PPO-PEO) type have been probed utilizing a variety of experimental techniques. The polymer amphiphiles studied here are Pluronic F127 (EO100PO65EO100) and Pluronic P123 (EO19PO69EO19), having the same length PPO block but different length PEO blocks and, accordingly, very different critical micellization concentrations (CMC). With increasing surfactant concentration in aqueous solutions of fixed polymer content, SDS interacts with unassociated PEO-PPO-PEO molecules to first form SDS-rich SDS/Pluronic assemblies and then free SDS micelles. SDS interacts with micellized PEO-PPO-PEO to form Pluronic-rich SDS/Pluronic assemblies, which upon further increase in surfactant concentration, break down and transition into SDS-rich SDS/Pluronic assemblies, followed by free SDS micelle formation. The SDS-rich SDS/Pluronic assemblies exhibit polyelectrolyte characteristics. The interactions and mode of association between nonionic macromolecular amphiphiles and short-chain ionic amphiphiles are affected by the polymer hydrophobicity and its concentration in the aqueous solution. For example, SDS binds to Pluronic F127 micelles at much lower concentrations (~0.01 mM) when compared to Pluronic P123 micelles (~1 mM). The critical association concentration (CAC) values of SDS in aqueous PEO-PPO-PEO solutions are much lower than CAC in aqueous PEO homopolymer solutions.
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Kou, Zongliang, Detian Dou, Jiayi Zhu, Yinyin Mai, Herui Yi, Lihong Lan, and Ping Lan. "Release Mechanism and pH Responsiveness of Starch-Based Polymers." Nano 14, no. 11 (November 2019): 1950145. http://dx.doi.org/10.1142/s1793292019501455.

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Amphiphilic polymer carriers (PEG–St–[Formula: see text]) were prepared from cassava starch and their pH response was investigated. First, hydrophobic tapioca starch polymer (St–[Formula: see text]) was prepared with octyl acyl as the hydrophobic group. The hydrophilic group polyethylene glycol (mPEG) was then introduced into the polymer by esterification to produce amphiphilic tapioca starch polymer (PEG–St–[Formula: see text]). Its self-assembly behavior was characterized using fluorescent probes. The morphology of PEG–St–[Formula: see text] was investigated by transmission electron microscopy (TEM). Loading of the anti-cancer drug curcumin was used to assess the delivery and slow-release performance of the amphiphilic tapioca starch polymer. Cumulative drug release was explored at various pH conditions, with the greatest release from drug-loaded micelles being observed under acidic conditions and stable in a neutral environment. These results provide a theoretical basis for the preparation of pH-responsive nanomicelle carriers, and a platform for the preparation of novel amphiphilic starch-based polymers.
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Saha, Debasish, Karthik R. Peddireddy, Jürgen Allgaier, Wei Zhang, Simona Maccarrone, Henrich Frielinghaus, and Dieter Richter. "Amphiphilic Comb Polymers as New Additives in Bicontinuous Microemulsions." Nanomaterials 10, no. 12 (December 2, 2020): 2410. http://dx.doi.org/10.3390/nano10122410.

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It has been shown that the thermodynamics of bicontinuous microemulsions can be tailored via the addition of various different amphiphilic polymers. In this manuscript, we now focus on comb-type polymers consisting of hydrophobic backbones and hydrophilic side chains. The distinct philicity of the backbone and side chains leads to a well-defined segregation into the oil and water domains respectively, as confirmed by contrast variation small-angle neutron scattering experiments. This polymer–microemulsion structure leads to well-described conformational entropies of the polymer fragments (backbone and side chains) that exert pressure on the membrane, which influences the thermodynamics of the overall microemulsion. In the context of the different polymer architectures that have been studied by our group with regards to their phase diagrams and small-angle neutron scattering, the microemulsion thermodynamics of comb polymers can be described in terms of a superposition of the backbone and side chain fragments. The denser or longer the side chain, the stronger the grafting and the more visible the brush effect of the side chains becomes. Possible applications of the comb polymers as switchable additives are discussed. Finally, a balanced philicity of polymers also motivates transmembrane migration in biological systems of the polymers themselves or of polymer–DNA complexes.
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Takahashi, Haruko, Gregory A. Caputo, and Kenichi Kuroda. "Amphiphilic polymer therapeutics: an alternative platform in the fight against antibiotic resistant bacteria." Biomaterials Science 9, no. 8 (2021): 2758–67. http://dx.doi.org/10.1039/d0bm01865a.

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Du, Zhukang, Xiaolong Yan, Ning Sun, and Biye Ren. "Dual stimuli-responsive nano-structure transition of three-arm branched amphiphilic polymers containing ferrocene (Fc) and azobenzene (Azo) moieties in aqueous solution." Soft Matter 15, no. 43 (2019): 8855–64. http://dx.doi.org/10.1039/c9sm01437c.

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Wessels, Michiel G., and Arthi Jayaraman. "Self-assembly of amphiphilic polymers of varying architectures near attractive surfaces." Soft Matter 16, no. 3 (2020): 623–33. http://dx.doi.org/10.1039/c9sm02104c.

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We use coarse-grained molecular dynamics simulations to investigate the assembly of A–B amphiphilic polymers near/on surfaces as a function of polymer architecture and surface attraction to the solvophobic B-block in the polymer.
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Dissertations / Theses on the topic "Amphiphilic polymers"

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Collette, Elisabeth Anne. "Synthesis and Characterization of Amphiphilic Polymers." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1386959114.

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Njikang, Gabriel. "Interfacial Properties of Amphiphilic Dendritic Polymers." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/1232.

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The self-assembly behavior of arborescent polystyrene-graft-poly(ethylene oxide) copolymers (PS-g-PEO) at the air-water interface and the solubilization/release properties of arborescent polystyrene-graft-poly(2-vinylpyridine) (PS-g-P2VP) copolymers were investigated. These amphiphilic dendritic molecules are covalently bonded unimolecular micelles incorporating a highly branched hydrophobic polystyrene core surrounded by a hydrophilic poly(ethylene oxide) or poly(2-vinylpyridine) shell. Molecules of PS-g-PEO copolymers spontaneously formed supramolecular assemblies at the air-water interface. The type of superstructures formed was found to depend upon copolymer composition, while the level of association was more directly related to the branching density of the polymers. At low surface pressures the PEO segments apparently remained adsorbed on the water subphase, but desorbed into water at very high surface pressures, in the condensed monolayer state. Controlled degradation of the PEO chains with UV light greatly enhanced molecular association, resulting in the formation of either large clusters or long ribbon-like superstructures. The PS-g-P2VP copolymers were found to efficiently solubilize and release hydrophobic small molecules in aqueous media. The partition coefficient and solubilization capacity of the copolymers for hydrophobic polyaromatic hydrocarbons increased with the polystyrene content of the copolymers, while the rate of solubilization decreased with increasing branching functionality of the copolymers. The release profiles for two model drugs displayed an initial burst in release followed by gradual approach to equilibrium. The diffusion coefficients of the drugs in the micelles increased with the branching functionality and the generation number of the micelles, presumably due to increased electrostatic repulsions of the protonated vinylpyridine units.
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Capuano, G. "AMPHIPHILIC, BIODEGRADABLE ANDBIOCOMPATIBLE POLYMERS FOR INDUSTRIALAPPLICATIONS." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/477898.

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The aim of this PhD work was to establish the synthetic procedures for new families of biocompatible and biodegradable and/or bioeliminable biomaterials that can be differently processed to obtain nanoparticles, core-shell nanofibres and hydrogel slabs or conduits, respectively. Depending on composition, size and morphology, these biomaterials may be intended for applications as drug delivery systems and/or tissue regeneration. Specifically, the research project has been developed along two main lines: • Synthesis of poly(lactic-glycolic acid)-g-poly(1-vinylpyrrolidin-2-one) (PLGA-g-PVP) copolymers whose architecture consisted of a long PLGA backbone with oligomeric PVP pendants. These were obtained by the radical polymerisation of 1-vinylpyrrolidin-2-one in molten PLGA 50:50, acting as chain transfer agent. The procedure was a single pot - single step one. Copolymers were characterized by FTIR, 1H- and 13C-NMR and thermal analyses. They were saponified giving, besides PLGA degradation products, also un-degraded PVP. This was isolated and analysed by size exclusion chromatography, to evaluate the molecular weights of grafted PVP chains. MALDI-TOF analysis allowed identifying the chemical structure of PVP terminals and unambiguously establishing that PVP chains had been grafted onto PLGA backbone PLGA-g-PVP with different PVP content were formulated as drug nanocarriers by different procedures. Doxorubicin-loaded nanoparticles were prepared by the solvent diffusion method and fully characterised. In vitro drug release kinetics were studied and in vitro biological activity evaluated on several antitumoral cell lines. PLGA-g-PVP were also used as coatings of lipid nanocapsules for the delivery of curcumin and artemisinin as antimalarials. Drug loaded-lipid micro-dispersions were first prepared by oil in water emulsion. The lipid drops were converted into nanometric ones by high pressure homogenization and finally surface coated by adding a DMSO/acetone PLGA-g-PVP solution. Growth inhibition assay were conducted on plasmodium falciparum (3D7) cultures. Haemoltic assays were conducted on healthy red blood cells. PLGA-g-PVP- and PLGA-based scaffolds consisting of nanofibrous mats were produced by electrospinning. Starting materials were electrospun and their morphology was evaluated by scanning electron microscopy and wettability by contact angle measurements. Coaxial electrospinning of two materials, in which PLGA formed the core and PLGA-g-PVP the shell of fibres, were also conducted and compared with those obtained by mixed solutions of staritng materials. Chemical composition was evaluated by TGA, morphology by scanning electron microscopy and wettability by contact angle measurements. Nanofabric scaffold produced will be evaluated for drug release and tissue engineering applications. • Synthesis of a new classes of poly(saccharide)-poly(aminoamine)s 3D-network intended as scaffolds for the regeneration of liver. In particular, hyaluronic acid-polyamidoamine and hyaluronic acid-gelatin- polyamidoamine hydrogels were synthesised by amidation reaction between the carboxylic acid group of hyaluronic acid and amine groups of gelatin and or an NH2-functionalized PAA, promoted by 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM) as coupling agent. Chemical-physical characterization were carried out on hydrogels. In order to promote hepatic cell proliferation serotonin was bonded to both hydrogels, adding it to the initial recipe, exploiting the above reaction between carboxylic acid group of hyaluronic acid and amine group of serotonin. Serotonin-loaded hydrogels were tested in vitro to evaluate biological efficacy.
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Kilbinger, Andreas Felix Michael. "Self-organising amphiphilic oligothiophene block co-polymers." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4389/.

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A new route to oligothiophene-PEO-block-co-polymers has been developed, in which well-defined a-oligothiophene blocks (from bithiophene to sexithiophene) alternate with poly(ethylene oxide) blocks. These materials show high solubility in common organic solvents. Sexithiophene derivatives with short PEO chains attached at the a-positions have been synthesised as model systems for the above sexithiophene polymer. PEO side-chains as short as pentaethylene glycol had a good solubilising effect on the otherwise insoluble sexithiophene. All compounds prepared exhibited surface activity, as shown by monolayer experiments on a Langmuir trough. Sexithiophene model compounds with short PEO side-chains could be compressed to form a two-dimensional condensed phase. X-ray diffraction of melt cast films of the oligothiophene polymers showed that a minimum oligothiophene block-length of five thiophenes (pentathiophene) was necessary to fully disturb PEO crystallisation. The sexithiophene polymer formed regions of crystalline/aggregated sexithiophene in the bulk. UV/Vis and fluorescence studies in solution indicated that the oligothiophene segments were molecularly dissolved in good solvents like chloroform. Aggregation of the oligothiophenes occurred in THF/water mixtures, which was consistent with observed shifts of the UV absorption maxima towards the blue and quenching of the fluorescence. An oligothiophene length of four thiophenes (quaterthiophene) was necessary to observe this aggregation phenomenon. A sexithiophene derivative with chiral pentaethylene glycol side chains showed a large circular dichroism effect in aqueous solution and no effect in chloroform solution, indicating the formation of a chiral superstructure upon aggregation.
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Wang, Yi. "The Synthesis and Characterization of Amphiphilic Poly(Ethylene Oxide)-Block-Poly(Octadecyl Acrylate) Block Copolymers." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399491109.

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ZHOU, YIFAN. "SELF-ASSEMBLY AND SELF-RECOGNITION BEHAVIORS OF AMPHIPHILIC MACROMOLECULES IN SOLUTION." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1619093496152417.

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Alexander, Nicolas Edward. "Multidimensional Mass Spectrometry of Amphiphilic Systems." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1532773038466757.

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Roebuck, Deborah Anne. "Investigation into synthetic amphiphilic polymers for intracellular delivery." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/32273.

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Delivery of siRNA therapeutics to their target site within the cell interior is a challenge that hinders their effective use in disease treatment. PP-75, a pH-responsive polymer, demonstrates potential to enhance intracellular siRNA-delivery by overcoming endosomal entrapment. PP-75 also provides a promising platform for development of targeted delivery, following conjugation of DARPin targeting ligands. Novel PP-75 cross-linker derivatives, PP-75-aminofluorescein, PP-75-siRNA and PP-75-DARPin conjugates have been developed and characterised for in vitro application. PP-75 delivery to SK-BR-3 (Her2+) and MDA-MB-231 (Her2-) breast cancer cells has been demonstrated for the first time. The membrane-lytic activity of PP-75 was limited at physiological pH but effective within the pH range typical of early endosomes. PP-75 did not demonstrate cytoxicity, with cells tolerating treatments up to 2.5 mg/mL over 72 h. Cellular internalisation and endosomal escape of PP-75 aminofluorescein (AFC) was confirmed via confocal microscopy, demonstrated by diffuse cytoplasmic delivery. Flow cytometry confirmed cellular internalisation of PP-75 AFC was via endocytosis. As reporter cells expressing firefly and Renilla luciferases, the breast cancer lines offered a robust assay read out capable of distinguishing between target specific and non-specific gene knockdown. The functionality of novel siRNA payloads that targeted firefly luciferase was confirmed by mRNA and protein knockdown and provided the foundation for delivery of PP-75 siRNA conjugates. Target specific DARPin affinity was confirmed for the SK-BR-3 (Her2+) cells and not MDA-MD-231 (Her2-) cells, demonstrating selective binding to the extracellular Her2 protein. The expression of a novel but structurally comparable negative control DARPin (5K D1) demonstrated no affinity for either cell line. The introduction of a free cysteine residue to the DARPin sequences facilitated attachment onto PP-75. PP-75 therefore has the potential to demonstrate intracellular delivery of siRNA payloads, capable of delivery to specific cell populations via DARPin targeting.
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Vandevoorde, Colleen A. (Colleen Anne). "Amphiphilic star polymers as solubilizing agents for environmental spearations." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10635.

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Rhyner, Matthew N. "Development of cancer diagnostics using nanoparticles and amphiphilic polymers." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22582.

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Thesis (Ph. D.)--Biomedical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Nie, Shuming; Committee Member: Bao, Gang; Committee Member: Chung, Leland; Committee Member: Murthy, Niren; Committee Member: Prausnitz, Mark.
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Books on the topic "Amphiphilic polymers"

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McCormick, Charles L., ed. Stimuli-Responsive Water Soluble and Amphiphilic Polymers. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.

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1946-, McCormick Charles L., ed. Stimuli-responsive water soluble and amphiphilic polymers. Washington, DC: American Chemical Society, 2000.

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Borisov, Oleg, and Axel H. E. Müller. Self organized nanostructures of amphiphilic block copolymers. Berlin: Springer, 2011.

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Liu, Xiao-Hua. Langmuir-Blodgett studies of amphiphilic liquid crystals and polymers. Manchester: University of Manchester, 1993.

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Paul, Dubin, Tong Penger 1956-, American Chemical Society. Division of Polymer Chemistry., American Chemical Society. Division of Colloid and Surface Chemistry., and American Chemical Society Meeting, eds. Colloid-polymer interactions: Particulate, amphiphilic, and biological surfaces : developed from a symposium. Washington, DC: ACS, 1993.

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Patrickios, Costas S., ed. Amphiphilic Polymer Co-networks. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788015769.

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Polymer aging, stabilizers, and amphiphilic block copolymers. New York: Nova Science Publishers, 2010.

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Liudvikas, Segewicz, and Petrowsky Marijus, eds. Polymer aging, stabilizers, and amphiphilic block copolymers. Hauppauge, N.Y: Nova Science Publishers, 2009.

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T, Nylander, and Lindman Björn 1942-, eds. Lipids and polymer-lipid systems. Berlin: Springer, 2002.

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McCormick, Charles L. Stimuli-Responsive Water Soluble and Amphiphilic Polymers. An American Chemical Society Publication, 2000.

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Book chapters on the topic "Amphiphilic polymers"

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Sengupta, Srijoni, Prashant Gupta, Priyanka Sengupta, and Ayan Dey. "Amphiphilic Hyperbranched Polymers." In Functionalized Polymers, 33–63. Boca Raton : CRC Press, [2021]: CRC Press, 2021. http://dx.doi.org/10.1201/9780367821913-3.

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Kita-Tokarczyk, Katarzyna, Mathias Junginger, Serena Belegrinou, and Andreas Taubert. "Amphiphilic Polymers at Interfaces." In Advances in Polymer Science, 151–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/12_2010_58.

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Kohut, A., L. Sieburg, S. Vasylyev, O. Kudina, I. Hevus, S. Stafslien, J. Daniels, V. Kislenko, and A. Voronov. "Amphiphilic Invertible Polymers (AIPs)." In ACS Symposium Series, 205–24. Washington, DC: American Chemical Society, 2011. http://dx.doi.org/10.1021/bk-2011-1070.ch013.

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Gholipourmalekabadi, Mazaher, Nishigandh Sunil Pande, Bharatraj Singh Rathore, and Narendra Pal Singh Chauhan. "2. Antibacterial activity of amphiphilic polymers." In Biocidal Polymers, edited by Narendra Pal Singh Chauhan, 33–56. Berlin, Boston: De Gruyter, 2019. http://dx.doi.org/10.1515/9783110639131-002.

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Nagarajan, R. "Amphiphilic Surfactants and Amphiphilic Polymers: Principles of Molecular Assembly." In ACS Symposium Series, 1–22. Washington, DC: American Chemical Society, 2011. http://dx.doi.org/10.1021/bk-2011-1070.ch001.

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Kohut, Ananiy, Ivan Hevus, Stanislav Voronov, and Andriy Voronov. "Amphiphilic Invertible Polymers and Their Applications." In Industrial Applications for Intelligent Polymers and Coatings, 399–415. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26893-4_19.

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Ilker, M. Firat, Gregory N. Tew, and E. Bryan Coughlin. "Amphiphilic Polymers with Potent Antibacterial Activity." In ACS Symposium Series, 175–97. Washington, DC: American Chemical Society, 2007. http://dx.doi.org/10.1021/bk-2007-0980.ch011.

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Kohut, Ananiy M., Ivan O. Hevus, Stanislav A. Voronov, and Andriy S. Voronov. "Synthesis of Amphiphilic Invertible Polymers for Biomedical Applications." In Polymers for Biomedicine, 525–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118967904.ch17.

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Branham, Kelly D., and Charles L. McCormick. "Photophysical and Rheological Studies of Amphiphilic Polyelectrolytes." In Multidimensional Spectroscopy of Polymers, 551–67. Washington, DC: American Chemical Society, 1995. http://dx.doi.org/10.1021/bk-1995-0598.ch032.

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Amiel, Catherine, Laurence Moine, Agnès Sandier, Wyn Brown, Cristelle David, Frederique Hauss, Estelle Renard, Martine Gosselet, and Bernard Sébille. "Macromolecular Assemblies Generated by Inclusion Complexes between Amphipathic Polymers and β-Cyclodextrin Polymers in Aqueous Media." In Stimuli-Responsive Water Soluble and Amphiphilic Polymers, 58–81. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2001-0780.ch004.

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Conference papers on the topic "Amphiphilic polymers"

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Bendaikha, H., G. Clisson, A. Khoukh, J. François, S. Ould Kada, A. Krallafa, Alberto D’Amore, Domenico Acierno, and Luigi Grassia. "Synthesis and Characterization of Amphiphilic Graft Copolymers of Poly (1,3dioxolane) Macromonomers with Styrene and Methyl Methacrylate." In IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2008. http://dx.doi.org/10.1063/1.2989058.

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Zhang, Xiangfeng, Hongbin Yang, Pengxiang Wang, Shujun Guo, Changxiao Cao, Chao Chen, and Wanli Kang. "Oil-Displacement Characteristics and EOR Mechanism of Amphiphilic Polymers With Two Molecular Weights." In SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/192385-ms.

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Jin, Yi, Jian Zhang, Engao Tang, Xudong Wang, Yuyang Liu, Wensheng Zhou, and Zhijie Wei. "A Successful Activator Flooding Pilot Test in Offshore Oilfield: A Comprehensive Evaluation and Interpretation." In International Petroleum Technology Conference. IPTC, 2023. http://dx.doi.org/10.2523/iptc-22880-ms.

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Abstract Oil reserves with oil viscosity above 150 mPa·s account for a large proportion of the Bohai Oilfield. However, due to the low mobility of heavy oil, and low sweep efficiency of injected fluid, the recovery factor of heavy oil is always low. A new amphiphilic polymer (activator), which can effectively disassemble the accumulation of asphaltene molecular layer of heavy oil, thus reducing oil viscosity has been developed in the lab and applied for two injection wells in Bohai Oilfield for a pilot trial. In this paper, the pilot trial of heavy-oil activator flooding (HAF) is comprehensively evaluated in both injectivity, production, and interwell connectivity analyses. The apparent injectivity index, Hall plot analysis, injection profile measurement for different layers, and PI test methods are applied to study the seepage resistance build-up effect at injection wells. Waterflooding characteristic curve method is implemented for history matching and oil incremental analysis. The interwell connectivity between wells is characterized by the Capacitance Resistance model (CRM). The injection trials showed great seepage resistance build-up effects at two activator injectors. There are apparent deviations in Hall plots after the activator injection. Activator flooding enables uniform water injection profiles for different layers. The PI tests show that the pressure drop speeds get lowered during the injection period. As for the oil incremental effect evaluation, the theoretical waterflooding characteristic curve function gives an estimation of the incremental oil production to be 1.77×104 m3 during the evaluation period. CRM analysis indicates that the connectivity between injector I2 and producer P4 is higher than that of other wells, and the time lag of getting a response by the activator fluid is smaller than other wells, which is an indication of potential fluid channeling in the flow path. It is validated by the high concentration of produced agent from P4 during HAF. The successful implementation of the activator flooding pilot trial proves that the lab results of amphiphilic polymers can be scaled up to field scale and it plays an important role in the de-risking of full-field implementation. Besides, it shed light upon the effective displacement of heavy oil with a viscosity greater than 150 mPa·s in offshore reservoirs by amphiphilic polymers.
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Guo, Hu, Xiuqin Lyu, Yang Xu, Shaopeng Liu, Yuxuan Zhang, Fengxiang Zhao, Zhengbo Wang, et al. "Recent Advances of Polymer Flooding in China." In SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200084-ms.

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Abstract Polymer flooding is one of the most promising chemical enhanced oil recovery (EOR) techniques which have high incremental oil recovery factor (IORF), low cost and wide reservoir applicability. The first field test of polymer flooding was reported in the United States in 1960s. The first large commercial polymer flooding in China started in Daqing oilfield, which has been remained the largest application in the world. However, encouraged by the conventional field applications and new findings of polymer's viscoelasticity effect on residual oil saturation (ROS) reduction, some high concentration high molecular weight polymer flooding (HCHMW) field tests have been conducted and reported. Although some field tests were well documented, subsequent progress was seldom reported. According to a recent review of latest polymer flooding projects in China, it is found that HCHMW have only very limited application in Daqing. This is not in agreement with the expectations especially that viscoelastivity of synthetic partically hydrolyzed polyacrylamide (HPAM) is drawing much attention recently. This paper explains why HCHMW is not widely used at present. Different opinions on polymer's viscoelasticity effect on ROS reduction are also critically reviewed. Other field progress of salt-tolerance polymer flooding tests and new amphiphilic polymer tests in Daqing were summarized. Associative polymer (APs) commercial application in offshore reservoirs and some new polymers used in China were also involved. Risk of high polymer injection pressure, optimum viscosity ratio, blocking mechanism, and capillary number theory are discussed. Learnings from many polymer flooding field applications has been given. In the end, quaternary recovery practices in post-polymer flooding reservoirs were compared. This paper helps to clarify some misleading ideas in polymer flooding implementations based on theory and practices of polymer flooding in China.
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Seki, Takahiro, Takashi Tamaki, Ryo-ichi Fukuda, Makoto Yokoi, and Hideo Hiramatsu. "Photoinduced Alignment Behaviors of a Nematic Liquid Crystal on Azobenzene Langmuir-Blodgett Monolayers." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd41.

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Trans/cis photoisomerization of azobenzene (Az) molecular films on the substrate is capable of inducing homeotropic/planar alignment changes of nematic liquid crystals (LCs). These photofunctional surfaces are called "command surfaces." (Fig.1)1 The Langmuir-Blodgett (LB) technique provides importance information on the design of the surface layer. The LB film preparation condition should influence, to a large extent, the aligning behavior of the nematic LC as formerly proposed by Hiltrop and Stegemeyer.2 The present work is undertaken to elucidate the relationship between the conditions of the LB film conditions and the LC aligning behaviors. For Az LB film preparation, two sets of amphiphilic Az side chain polymers are employed, the backbone being (i) poly(vinyl alcohol) and (ii) poly(ethyleneimine). Polymeric materials are required to obtain highly photoreactive Az LB films. Single monolayers are prepared as the Az LB films throughout the investigation to avoid complexity of the film structure.
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Alexandridis, Paschalis, Dengpan Dong, Dmitry Bedrov, Marina Tsianou, and Samhitha Kancharla. "Surfactant micelle structure and composition." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/hwzn7583.

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Surfactants are mixed with various ingredients during their formulation into products and during their use. The interactions of surfactants with compounds such as electrolytes, polar organic solvents and solutes, other surfactants, polymers, and, of course, the solvent water, are manifested in the formation and structure of micelles. In turns, self-assembly in solution and on surfaces underlies the macroscopic performance of surfactant formulations. Accordingly, it is important to have information available on the structure and composition of micelles at various conditions. To this end, we utilize complementary experiments (small-angle neutron scattering, SANS, with contrast variation) and modeling (molecular dynamics, MD), and present here examples on how the structure of micelles formed in water by anionic surfactants (sodium dodecylsulfate, SDS, perfluorooctanoate, PFOA) responds to the presence of additives (salt [10.1016/j.colsurfa.2021.127313], urea [10.1021/acs.langmuir.1c00433], ethanol [10.1039/d1cp00049g], poly(ethylene oxide) (PEO) [10.1021/jp5023168], PEO-based amphiphilic polymers [10.1016/j.jcis.2021.10.176]) across a wide range of compositions. A detailed description emerges on how the additives distribute at the outer surface of the micelles and in their interior, which is used to rationalize various properties of the mixtures.
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Basham, Colin, Megan Pitz, Joseph Najem, Stephen Sarles, and Md Sakib Hasan. "Memcapacitive Devices in Neuromorphic Circuits via Polymeric Biomimetic Membranes." In ASME 2019 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/smasis2019-5648.

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Abstract Two-terminal adaptive materials and circuit elements that mimic the signal processing, learning, and computing capabilities of biological synapses are essential for next-generation computing systems. To this end, we have recently developed resistive (ion channel) and capacitive (lipid bilayer) memory elements that mimic the composition, structure, and plasticity of biological synapses. Unlike solid-state counterparts, these biomolecular systems are low-power, analog, less noisy, biocompatible, and capable of exhibiting multiple timescales of short-term synaptic plasticity. However, lipid membranes lack structural stability and modularity necessary for a long-lasting adaptive material system. To address this issue, we propose the replacement of phospholipids with amphiphilic polymers to create artificial membranes, which have been demonstrated to be more durable than phospholipids. With the focus on memory capacitors, we demonstrate that polymeric bilayers can exhibit pinched hysteresis in the Q-v plane because of voltage-induced geometrical changes. Further, we demonstrate that the memcapacitive response is altered based on the surrounding oil medium; smaller oil molecules are retained at higher volume in the membrane, so that thicker bilayers have lower nominal capacitance but can vary this value by over 400%. Finally, we present a physics-based model that enables us to predict the device’s areal voltage-dependent response. Polymeric bilayers represent a significant enhancement in the field of soft-matter, geometrically-reconfigurable memcapacitors, and their highly customizable compositions will allow for a finely tuned electrical response that has a future in brain-inspired materials and circuits.
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Clays, Koen, Thomas L. Penner, Nancy J. Armstrong, and Douglas R. Robello. "Phase-Matched Second-Harmonic Generation in Waveguides of Polymeric Langmuir-Blodgett Films." In Nonlinear Optics. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.pd6.

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Langmuir-Blodgett (LB) films have been fabricated from a preformed acrylate amphiphilic copolymer with nonlinear optical (NLO) active chromophores covalently attached to the polymer backbone. By alternate deposition of this NLO active polymer with a NLO passive amphiphilic polymer, high quality multilayer films have been obtained with sufficient thickness to allow waveguiding in the LB films. The observed optical attenuation is between 1 and 3 dB/cm. The linear and nonlinear optical characteristics of these films have been determined, both in transmission (or reflection) and in waveguide format. The high degree of chromophore order observed in these LB films makes this type of supramolecular structure attractive for NLO applications. Based on the observed parameters (dispersion of the refractive indices, birefringence, absorption, tilt angle of the chromophore, hyperpolarizability), the guided-mode-to-substrate-radiation-mode Cerenkov phase-matching scheme was used for efficient second-harmonic generation.
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Chuang, Ming-Kai, Chun-Hao Lin, and Fang-Chung Chen. "Plasmonic effects of amphiphilic gold nanoparticles in polymer optoelectronic devices." In 2016 International Conference on Optical MEMS and Nanophotonics (OMN). IEEE, 2016. http://dx.doi.org/10.1109/omn.2016.7565819.

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Shah, Mohsin, Mun Hwan Choi, and Sung Chul Yoon. "Amphiphilic polymeric nanoparticles for drug delivery: Synthesis and characterization." In 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045181.

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Reports on the topic "Amphiphilic polymers"

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Altstein, Miriam, and Ronald J. Nachman. Rational Design of Insect Control Agent Prototypes Based on Pyrokinin/PBAN Neuropeptide Antagonists. United States Department of Agriculture, August 2013. http://dx.doi.org/10.32747/2013.7593398.bard.

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The general objective of this study was to develop rationally designed mimetic antagonists (and agonists) of the PK/PBAN Np class with enhanced bio-stability and bioavailability as prototypes for effective and environmentally friendly pest insect management agents. The PK/PBAN family is a multifunctional group of Nps that mediates key functions in insects (sex pheromone biosynthesis, cuticular melanization, myotropic activity, diapause and pupal development) and is, therefore, of high scientific and applied interest. The objectives of the current study were: (i) to identify an antagonist biophores (ii) to develop an arsenal of amphiphilic topically active PK/PBAN antagonists with an array of different time-release profiles based on the previously developed prototype analog; (iii) to develop rationally designed non-peptide SMLs based on the antagonist biophore determined in (i) and evaluate them in cloned receptor microplate binding assays and by pheromonotropic, melanotropic and pupariation in vivo assays. (iv) to clone PK/PBAN receptors (PK/PBAN-Rs) for further understanding of receptor-ligand interactions; (v) to develop microplate binding assays for screening the above SMLs. In the course of the granting period A series of amphiphilic PK/PBAN analogs based on a linear lead antagonist from the previous BARD grant was synthesized that incorporated a diverse array of hydrophobic groups (HR-Suc-A[dF]PRLa). Others were synthesized via the attachment of polyethylene glycol (PEG) polymers. A hydrophobic, biostablePK/PBAN/DH analog DH-2Abf-K prevented the onset of the protective state of diapause in H. zea pupae [EC50=7 pmol/larva] following injection into the preceding larval stage. It effectively induces the crop pest to commit a form of ‘ecological suicide’. Evaluation of a set of amphiphilic PK analogs with a diverse array of hydrophobic groups of the formula HR-Suc-FTPRLa led to the identification of analog T-63 (HR=Decyl) that increased the extent of diapause termination by a factor of 70% when applied topically to newly emerged pupae. Another biostablePK analog PK-Oic-1 featured anti-feedant and aphicidal properties that matched the potency of some commercial aphicides. Native PK showed no significant activity. The aphicidal effects were blocked by a new PEGylated PK antagonist analog PK-dF-PEG4, suggesting that the activity is mediated by a PK/PBAN receptor and therefore indicative of a novel and selective mode-of-action. Using a novel transPro mimetic motif (dihydroimidazole; ‘Jones’) developed in previous BARD-sponsored work, the first antagonist for the diapause hormone (DH), DH-Jo, was developed and shown to block over 50% of H. zea pupal diapause termination activity of native DH. This novel antagonist development strategy may be applicable to other invertebrate and vertebrate hormones that feature a transPro in the active core. The research identifies a critical component of the antagonist biophore for this PK/PBAN receptor subtype, i.e. a trans-oriented Pro. Additional work led to the molecular cloning and functional characterization of the DH receptor from H. zea, allowing for the discovery of three other DH antagonist analogs: Drosophila ETH, a β-AA analog, and a dF analog. The receptor experiments identified an agonist (DH-2Abf-dA) with a maximal response greater than native DH. ‘Deconvolution’ of a rationally-designed nonpeptide heterocyclic combinatorial library with a cyclic bis-guanidino (BG) scaffold led to discovery of several members that elicited activity in a pupariation acceleration assay, and one that also showed activity in an H. zea diapause termination assay, eliciting a maximal response of 90%. Molecular cloning and functional characterization of a CAP2b antidiuretic receptor from the kissing bug (R. prolixus) as well as the first CAP2b and PK receptors from a tick was also achieved. Notably, the PK/PBAN-like receptor from the cattle fever tick is unique among known PK/PBAN and CAP2b receptors in that it can interact with both ligand types, providing further evidence for an evolutionary relationship between these two NP families. In the course of the granting period we also managed to clone the PK/PBAN-R of H. peltigera, to express it and the S. littoralis-R Sf-9 cells and to evaluate their interaction with a variety of PK/PBAN ligands. In addition, three functional microplate assays in a HTS format have been developed: a cell-membrane competitive ligand binding assay; a Ca flux assay and a whole cell cAMP ELISA. The Ca flux assay has been used for receptor characterization due to its extremely high sensitivity. Computer homology studies were carried out to predict both receptor’s SAR and based on this analysis 8 mutants have been generated. The bioavailability of small linear antagonistic peptides has been evaluated and was found to be highly effective as sex pheromone biosynthesis inhibitors. The activity of 11 new amphiphilic analogs has also been evaluated. Unfortunately, due to a problem with the Heliothis moth colony we were unable to select those with pheromonotropic antagonistic activity and further check their bioavailability. Six peptides exhibited some melanotropic antagonistic activity but due to the low inhibitory effect the peptides were not further tested for bioavailability in S. littoralis larvae. Despite the fact that no new antagonistic peptides were discovered in the course of this granting period the results contribute to a better understanding of the interaction of the PK/PBAN family of Nps with their receptors, provided several HT assays for screening of libraries of various origin for presence of PK/PBAN-Ragonists and antagonists and provided important practical information for the further design of new, peptide-based insecticide prototypes aimed at the disruption of key neuroendocrine physiological functions in pest insects.
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