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Letteratura scientifica selezionata sul tema "Macromolecules"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Macromolecules"

Yashchuk, V. M., I. V. Lebedyeva e O. M. Navozenko. "Manifestations of triplet electronic excitations migration in π-electron containing polymers". Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, n. 1 (2019): 242–45. http://dx.doi.org/10.17721/1812-5409.2019/1.55.

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The results of spectral studies of polymers with aromatic side groups are considered and analyzed. In particular, the phosphorescence spectra of polyvinylcarbazole (PVCa) polyvinyl-7-benzocarbazole (PV7BK) polypropylcarbazole (PEPC) are presented and analyzed. The phosphorescence of these polymers has been shown to be related to the migration of triplet excitons in macromolecules. The phosphorescence of PVC is determined at 77by deep traps (oxides), at 4.2 -shallow traps (monomer units of PVCa). The spreading length of triplet excitons in PVCa macromolecules is 600 A – that corresponds to the average distances between adjacent traps in the macromolecule. There are no such traps in PV7BK macromolecules. The boundary conditions for triplet excitons in macromolecules of PV7BCa were used for evaluation the excitons spreading length. With this aim the dependence of phosphorescence spectra on molecular weihgt were studied The effect of changing of spectral positions of phosphorescence bands when exciton rich the end macromolecular cell was used. The average trip length of triplet excitons is approximately 1000 A. This distance is in fact limited by the probability of the meeting of triplet excitons in the macromolecule and their annihilation at a given excitation intensity.

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Bazunova, Marina, Valentina Chernova, Roman Lazdin, Angela Shurshina, Anna Bazunova, Mariya Elinson e Elena Kulish. "Cosolvents Impact on some Properties of the Solutions and the Films of Succinamide Chitosan". Chemistry & Chemical Technology 14, n. 4 (15 dicembre 2020): 481–86. http://dx.doi.org/10.23939/chcht14.04.481.

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The article deals with the method of the medical purpose materials creation with the controlled physico-chemical and mechanical deformation properties on the basis of water-soluble derivative of amino polysaccharide chitosan – succinamide chitosan. The essence of the method is the macromolecules aggregation processes regulation in the initial solutions by the injection of organic cosolvents – acetone and ethanol. It has been stated that in a mixed solvent succinamide chitosan molecules are not in the form of the isolated macromolecular balls but as the macromolecules interacting (aggregated) systems. It has been proved that the presence of cosolvents decreases the polymer macromolecule links capability to interact with an enzyme and increases physico-mechanical characteristics of the film materials.

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Sharp, Kim A. "Analysis of the size dependence of macromolecular crowding shows that smaller is better". Proceedings of the National Academy of Sciences 112, n. 26 (15 giugno 2015): 7990–95. http://dx.doi.org/10.1073/pnas.1505396112.

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The aqueous milieu inside cells contains as much as 30–40% dissolved protein and RNA by volume. This large concentration of macromolecules is expected to cause significant deviations from solution ideality. In vivo biochemical reaction rates and equilibria might differ significantly from those measured in the majority of in vitro experiments that are performed at much lower macromolecule concentrations. Consequently crowding, a nonspecific phenomenon believed to arise from the large excluded volume of these macromolecules, has been studied extensively by experimental and theoretical methods. However, the relevant theory has not been applied consistently. When the steric effects of macromolecular crowders and small molecules like water and ions are treated on an equal footing, the effect of the macromolecules is opposite to that commonly believed. Large molecules are less effective at crowding than water and ions. There is also a surprisingly weak dependence on crowder size. Molecules of medium size, ∼5 Å radius, have the same effect as much larger macromolecules like proteins and RNA. These results require a reassessment of observed high-concentration effects and of strategies to mimic in vivo conditions with in vitro experiments.

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Hudder, Alice, Lubov Nathanson e Murray P. Deutscher. "Organization of Mammalian Cytoplasm". Molecular and Cellular Biology 23, n. 24 (15 dicembre 2003): 9318–26. http://dx.doi.org/10.1128/mcb.23.24.9318-9326.2003.

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ABSTRACT Although the role of macromolecular interactions in cell function has attracted considerable attention, important questions about the organization of cells remain. To help clarify this situation, we used a simple protocol that measures macromolecule release after gentle permeabilization for the examination of the status of endogenous macromolecules. Treatment of Chinese hamster ovary cells with saponin under carefully controlled conditions allowed entry of molecules of at least 800 kDa; however, there were minimal effects on internal cellular architecture and protein synthesis remained at levels comparable to those seen with intact cells. Most importantly, total cellular protein and RNA were released from these cells extremely slowly. The release of actin-binding proteins and a variety of individual cytoplasmic proteins mirrored that of total protein, while marker proteins from subcellular compartments were not released. In contrast, glycolytic enzymes leaked rapidly, indicating that cells contain at least two distinct populations of cytoplasmic proteins. Addition of microfilament-disrupting agents led to rapid and extensive release of cytoplasmic macromolecules and a dramatic reduction in protein synthesis. These observations support the conclusion that mammalian cells behave as highly organized, macromolecular assemblies (dependent on the actin cytoskeleton) in which endogenous macromolecules normally are not free to diffuse over large distances.

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Li, Chao, Xiangxiang Zhang, Mingdong Dong e Xiaojun Han. "Progress on Crowding Effect in Cell-like Structures". Membranes 12, n. 6 (3 giugno 2022): 593. http://dx.doi.org/10.3390/membranes12060593.

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Several biological macromolecules, such as proteins, nucleic acids, and polysaccharides, occupy about 30% of the space in cells, resulting in a crowded macromolecule environment. The crowding effect within cells exerts an impact on the functions of biological components, the assembly behavior of biomacromolecules, and the thermodynamics and kinetics of metabolic reactions. Cell-like structures provide confined and independent compartments for studying the working mechanisms of cells, which can be used to study the physiological functions arising from the crowding effect of macromolecules in cells. This article mainly summarizes the progress of research on the macromolecular crowding effects in cell-like structures. It includes the effects of this crowding on actin assembly behavior, tubulin aggregation behavior, and gene expression. The challenges and future trends in this field are presented at the end of the paper.

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Mohapatra, Somesh, Joyce An e Rafael Gómez-Bombarelli. "Chemistry-informed macromolecule graph representation for similarity computation, unsupervised and supervised learning". Machine Learning: Science and Technology 3, n. 1 (21 febbraio 2022): 015028. http://dx.doi.org/10.1088/2632-2153/ac545e.

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Abstract The near-infinite chemical diversity of natural and artificial macromolecules arises from the vast range of possible component monomers, linkages, and polymers topologies. This enormous variety contributes to the ubiquity and indispensability of macromolecules but hinders the development of general machine learning methods with macromolecules as input. To address this, we developed a chemistry-informed graph representation of macromolecules that enables quantifying structural similarity, and interpretable supervised learning for macromolecules. Our work enables quantitative chemistry-informed decision-making and iterative design in the macromolecular chemical space.

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Mormann, W., e K. H. Hellwich. "Structure-based nomenclature for cyclic organic macromolecules (IUPAC Recommendations 2008)". Pure and Applied Chemistry 80, n. 2 (1 gennaio 2008): 201–32. http://dx.doi.org/10.1351/pac200880020201.

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A structure-based nomenclature system for monocyclic and polycyclic organic macromolecules is presented. Single-strand mono- and polycyclic macromolecules as well as spiro macrocyclic compounds are covered. However, rotaxanes and catenanes, which contain interlocked rings, and rings or ring systems formed by noncovalent bonds are excluded. Also, polypeptides and carbohydrate polymers are not included. The nomenclature of cyclic macromolecules is based on the existing nomenclature of regular and irregular macromolecules, which in turn is based on the nomenclature of organic chemistry also published by IUPAC. The procedure for naming a cyclic macromolecule consists of transforming it to an open-chain regular or irregular macromolecule in such a way that naming of units proceeds in descending order of seniority but otherwise follows the rules established for these types of macromolecules. For polycyclic macromolecules, the same principles are followed after the main ring, bridges, and branch units are identified and locants for branch units as well as bridges are assigned. The complete names are assembled by citing the component names and locants in the appropriate order according to the rules in this document. Wherever possible, examples for illustration of the naming procedure have been chosen from the literature.

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Wang, Yang, Yan Dai, Qiang Luo, Xiaoli Wei, Xueyang Xiao, Haonan Li, Jiani Hu, Qiyong Gong, Jianlin Wu e Kui Luo. "Tumor Environment-Responsive Degradable Branched Glycopolymer Magnetic Resonance Imaging Contrast Agent and Its Tumor-Targeted Imaging". Journal of Biomedical Nanotechnology 15, n. 7 (1 luglio 2019): 1384–400. http://dx.doi.org/10.1166/jbn.2019.2759.

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Branched macromolecules have been used as carriers for imaging probes and drug delivery systems because of their tunable molecular structures, as well as their regular nanoscale structures and dimensions. We designed and synthesized two tumor environment-responsive branched and gadolinium (Gd)-based glycopolymer conjugates and investigated their potency as highly effective and safe magnetic resonance imaging (MRI) contrast agents. These branched macromolecules were prepared by one-pot reversible addition fragmentation chain transfer (RAFT) polymerization and conjugating chemistry. A biodegradable GFLG oligopeptide was used to successfully link the branch-chains of the branched macromolecules, finally a conjugate of this branched macromolecule and DOTA-Gd (HB-pGAEMA-Gd) with a molecular weight (MW) of 124 kDa was produced. Meanwhile, to improve the ability of tumor-targeting, we conjugated a tumor-targeting cRGDyK cyclic peptide to the branched molecule to prepare a tumor-targeted branched macromoleculeDOTA-Gd conjugate (HB-pGAEMA-RGD-Gd) with a MW of 136 kDa. The prepared branched macromolecules had a nanoscale hydrodynamic particle size and could be degraded into lower MW fragments with the cathepsin B. The aqueous phase relaxation efficiency of HB-pGAEMA-RGD-Gd (12.3 mM–1s–1 and HB-pGAEMA-Gd (13.2 mM–1s–1 was four times higher than that of DTPA-Gd (2.9 mM–1s–1), a clinically used contrast agent. In comparison with DTPA-Gd, the branched macromolecular contrast agents significantly enhanced the MRI signal intensity at the tumor site in vivo, and the enhancement of MRI signal intensity was up to 6 times that of the DTPA-Gd owing to their high relaxation efficiencies and accumulation at the tumor site. In addition, in vitro and in vivo toxicity studies indicated that the degradable macromolecular contrast agents had no significant toxicity.

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Pramod Kumar Mishra. "Theoretical estimate of the probability for macromole formation". JOURNAL OF ADVANCED APPLIED SCIENTIFIC RESEARCH 2, n. 4 (15 dicembre 2021): 1–8. http://dx.doi.org/10.46947/joaasr242020103.

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We estimate the polymerization probability of a macromolecule, where the macromolecule is made of distinct monomers; and there are different values of the fugacity for the addition of the monomers in the chain to form an infinitely long linear macromolecule of distinct monomers. The lattice model of the random walk has been used to mimic the conformations of an ideal chain in two and three dimensions, and this ideal chain is the macromolecules of distinct monomers. It has been shown through analytical estimates that the flexible macromolecules may be easily formed than the stiff macromolecules for both two and three dimensional cases. In the case of stiff chain, the ratio of the critical value of monomer fugacity is nothing but the log-log ratio of the Boltzmann’s weight corresponding to the monomers affinity corresponding to its conjugate monomer pair; and it is due to a fact that the stiff chain has small value of the entropy.

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Pawlak, Andrzej, e Justyna Krajenta. "Entanglements of Macromolecules and Their Influence on Rheological and Mechanical Properties of Polymers". Molecules 29, n. 14 (20 luglio 2024): 3410. http://dx.doi.org/10.3390/molecules29143410.

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Flexible macromolecules easily become entangled with neighboring macromolecules. The resulting network determines many polymer properties, including rheological and mechanical properties. Therefore, a number of experimental and modeling studies were performed to describe the relationship between the degree of entanglement of macromolecules and polymer properties. The introduction presents general information about the entanglements of macromolecule chains, collected on the basis of studies of equilibrium entangled polymers. It is also shown how the density of entanglements can be reduced. The second chapter presents experiments and models leading to the description of the movement of a single macromolecule. The next part of the text discusses how the rheological properties change after partial disentangling of the polymer. The results on the influence of the degree of chain entanglement on mechanical properties are presented.

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Più fonti

Tesi sul tema "Macromolecules"

Larsericsdotter, Helén. "Macromolecules at Interfaces". Doctoral thesis, Uppsala University, Centre for Surface Biotechnology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4661.

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In this thesis, the structure and stability of globular proteins adsorbed onto nanometer-sized hydrophilic silica particles were investigated using differential scanning calorimetry (DSC), hydrogen/deuterium exchange (HDX), and mass spectrometry (MS). The adsorption process itself was characterized with fluorescence and absorption spectroscopy and surface plasmon resonance (SPR). The combination of these methods offered a unique insight into adsorption-induced changes within proteins related to their adsorption characteristics. DSC contributed with thermodynamic information on the overall structural stability within the protein population. HDX in combination with MS contributed information on the structure and stability of adsorbed proteins with focus on changes within the secondary structure elements. In order to increase the structural resolution in this part of the investigation, proteolysis was performed prior to the MS analyzing step. Knowledge on the protein adsorption process was utilized in a practical approach called ligand fishing. In this approach, SPR was used to monitor the chip-based affinity purification of a protein with MS used for protein identification.

Adsorption isotherms revealed that electrostatic interactions play an important role in the adsorption of proteins to hydrophilic surfaces. DSC investigation revealed that the thermal stability of proteins reduces with increasing electrostatic attraction between the protein and the surface and that this effect diminishes at higher surface coverage. The mass-increase due to exchange between protein hydrogen atoms and deuterium atoms in solution was investigated as a function of time. This gave insight into adsorption-induced changes in the structural stability of proteins. By combining DSC and HDX-MS, it was possible to differentiate between adsorption-induced changes in the secondary and tertiary structure. Additionally, if limited proteolysis was performed, the investigations gave insight into the orientation and protein segment specific changes in the stability of proteins adsorbed to silica surfaces. The adsorption of proteins to silica particles also provided the basis for a new experimental design that allows handling of minute amounts of proteins in a ligand fishing application, as used in the field of functional proteomics.

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Larsericsdotter, Helén. "Macromolecules at interfaces /". Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4661.

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Ambrogi, Marcela. "Suplementação do meio de transporte com antioxidantes e moduladores de AMP cíclico como estratégia para melhorar a qualidade de oócitos bovinos destinados à produção in vitro de embriões /". Jaboticabal, 2016. http://hdl.handle.net/11449/142002.

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Orientador: Gisele Zoccal Mingoti
Banca: Fernanda da Cruz Landim
Banca: Joaquim Mansano Garcia
Resumo: O objetivo desse estudo foi avaliar os efeitos da suplementação do meio com diferentes fontes de macromoléculas, com bloqueadores da meiose e com antioxidantes durante o transporte de oócitos bovinos por 6 horas sobre: 1) progressão da maturação nuclear; 2) maturação citoplasmática e 3) competência no desenvolvimento e criotolerância dos embriões produzidos. Para tanto, o meio de transporte de oócitos foi suplementado com bloqueadores da meiose (forscolina e IBMX; Experimento 1) ou com diferentes tipos de macromoléculas (SFB ou BSA; Experimento 2), sendo que estes tratamentos ainda receberam ou não a suplementação com antioxidantes (mistura de cisteína, cisteamina e catalase). Os oócitos foram incubados em incubadora portátil (Minitub®) para simulação de transporte. Posteriormente, foram submetidos à maturação in vitro (MIV) em incubadora a 5% de CO2 em ar até completar 24h e, em seguida, foram fecundados e os prováveis zigotos foram cultivados in vitro durante 7 dias. Foi feito um grupo controle adicional no experimento I: MIV em incubadora com 10% de SFB por 24h. No experimento II foram feitos dois grupos controle adicionais MIV em incubadora com 10% de SFB por 24h sem e com antioxidantes (cisteína, cisteamina e catalase). Nos experimentos 1 e 2 foi avaliada a cinética da maturação nuclear e a maturação citoplasmática (através do posicionamento de mitocôndrias, do potencial de membrana mitocondrial e do conteúdo intracelular de espécies reativas do oxigênio) após o transpor... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this study was to evaluate the effects of supplementation of the medium with different sources of macromolecules with blockers of meiosis and antioxidants during transport of bovine oocytes for 6 hours on: 1) progression of nuclear maturation; 2) cytoplasmic maturation and 3) competence in the development and cryotolerance of embryos produced. Therefore, the medium of transport oocytes was supplemented with blocking of meiosis (forskolin and IBMX; Experiment 1) or with different types of macromolecules (FCS or BSA; Experiment 2), and these treatments yet received or not antioxidant supplementation (mixture of cysteine, cysteamine and catalase). Oocytes were incubated in a portable incubator (Minitub®) for transport simulation. Posteriorly were submitted in vitro maturation (IVM) in incubator at 5% CO2 in air until to complete 24 hours and then were fertilized and presumptive zygotes were cultured in vitro for 7 days. Has been made an additional control group in the experiment I: MIV incubator with 10% FCS for 24 hours (Control). In the second experiment were performed two additional control groups: IVM incubator with 10% FCS for 24 hours (Control); and IVM in an incubator with 10% FCS and antioxidants (cysteine, cysteamine and catalase) for 24 hours (Contr+Atx). In Experiments 1 and 2 were evaluated after nuclear maturation kinetics and cytoplasmic maturation (made by positioning mitochondria, the mitochondrial membrane potential and intracellular content of ... (Complete abstract click electronic access below)
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Stacklies, Wolfram. "Force Distribution in Macromolecules". Doctoral thesis, Universitätsbibliothek Leipzig, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-39367.

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All living organisms utilize thousands of molecular building blocks to perform mechanical tasks. These building blocks are mostly proteins, and their mechanical properties define the way they can be utilized by the cell. The spectrum ranges from rope like structures that give hold and stability to our bodies to microscopic engines helping us to perform or sense mechanical work. An increasing number of biological processes are revealed to be driven by force and well-directed distribution of strain is the very base of many of these mechanisms. We need to be able to observe the distribution of strain within bio-molecules if we want to gain detailed insight into the function of these highly complex nano-machines. Only by theoretical understanding and prediction of mechanical processes on the molecular level will we be able to rationally tailor proteins to mimic specific biological functions. This thesis aims at understanding the molecular mechanics of a wide range of biological molecules, such as the muscle protein titin or silk fibers. We introduce Force Distribution Analysis (FDA), a new approach to directly study the forces driving molecular processes, instead of indirectly observing them by means of coordinate changes.

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Darmani, Homa. "Erythrocyte adhesion by macromolecules". Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278681.

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Leute, Maria. "Macromolecules with phosphorus functionalities". [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-60833.

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Li, Youyong Kuppermann Aron. "Atomistic simulation of macromolecules /". Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-12072004-021118.

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Petraglio, Gabriele Carlo Luigi. "Large scale motions in macromolecules /". Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16786.

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Obermayer, Benedikt. "Mechanics and information of macromolecules". Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-119656.

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Tang, Yi-wen. "Surface modifying macromolecules for biomaterials". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10318.

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In this thesis, new biomaterials were developed by incorporating surface modifying macromolecules (SMMs) that enriched the surface with a fluoro-chemistry. The SMMs contained a linear polyurethane as the prepolymer component and the prepolymer was end-capped by a fluorinated alcohol. The SMM materials and the blend of these SMMs with the polyester-urea-urethane base polymer were characterized with respect to their bulk and the surface properties, response to their biodegradation in the presence of enzyme and their fibrinogen adsorption characteristics. The SMMs were found to have selectively migrated to the surface of the polymer mixtures as expected. The bulk thermal (e.g. glass transition temperature) were found to be unaltered for polyurethane samples containing up to 5% SMM. The "fluorine tail" of the SMMs allowed the substrate surfaces to achieve very low surface wettability. Contact angle values (water/air) for the new materials were as high as $116\sp\circ,$ which is higher than that of $\rm Teflon\sp{R}.$ Measurements of fibrinogen adsorption, an indication of the tendency of surfaces to stimulate thrombosis, showed that the SMM blended materials significantly reduced fibrinogen adsorption. A biodegradation test of a polyether-urea-urethane containing one of the SMMs optimized for the polyester-urea-urethane showed that the SMM was unable to inhibit degradation of the polyether-urea-urethane. This suggested that the SMM was not universally effective and that the microstructure of, and the interaction between, SMMs and the base polymer were also important factors to be considered during the investigations of the stability of polyurethanes. (Abstract shortened by UMI.)

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Più fonti

Libri sul tema "Macromolecules"

Elias, Hans-Georg. Macromolecules. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2005. http://dx.doi.org/10.1002/9783527627219.

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Elias, Hans-Georg. Macromolecules. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2006. http://dx.doi.org/10.1002/9783527627226.

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Elias, Hans-Georg. Macromolecules. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527627233.

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Elias, Hans-Georg. Macromolecules. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2009. http://dx.doi.org/10.1002/9783527627240.

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Elias, H. G. Macromolecules. Weinheim: Wiley-VCH, 2005.

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A, Jurnak Frances, e McPherson Alexander, a cura di. Biological macromolecules and assemblies. New York: Wiley, 1987.

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Hendrickson, Wayne A., e Kurt Wüthrich. Macromolecular structures 2000: Atomic structures of biological macromolecules reported during 1999. London, U.K: Elsevier Science London, 2000.

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Privalov, Peter L. Microcalorimetry of Macromolecules. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118337509.

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Russo, Maria Vittoria, a cura di. Advances in Macromolecules. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3192-1.

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A, Moore James, a cura di. Macromolecular syntheses: A periodic publication for the preparation of macromolecules. New York: Wiley, 1985.

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Capitoli di libri sul tema "Macromolecules"

Cropper, William H. "Macromolecules". In Mathermatica® Computer Programs for Physical Chemistry, 123–38. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2204-0_7.

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Schwarzbauer, Jan, e Branimir Jovančićević. "Macromolecules". In From Biomolecules to Chemofossils, 127–60. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25075-5_6.

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Mishra, Munmaya, e Biao Duan. "Macromolecules". In The Essential Handbook of Polymer Terms and Attributes, 98–99. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003161318-97.

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Elias, Hans-Georg. "Survey". In Macromolecules, 1–21. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch1.

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Elias, Hans-Georg. "Free-Radical Polymerization". In Macromolecules, 309–67. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch10.

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Elias, Hans-Georg. "Polymerization by Radiation or in Ordered States". In Macromolecules, 369–89. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch11.

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Elias, Hans-Georg. "Copolymerization". In Macromolecules, 391–429. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch12.

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Elias, Hans-Georg. "Polycondensation and Polyaddition". In Macromolecules, 431–509. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch13.

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Elias, Hans-Georg. "Biological Polymerization". In Macromolecules, 511–69. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch14.

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Elias, Hans-Georg. "Reactions of Macromolecules". In Macromolecules, 571–604. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627219.ch15.

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Atti di convegni sul tema "Macromolecules"

Buckley, A., G. W. Calundann e A. J. East. "Multifunctional Macromolecules". In 1988 Los Angeles Symposium--O-E/LASE '88, a cura di Robert L. Gunshor. SPIE, 1988. http://dx.doi.org/10.1117/12.943961.

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Yan, Karen Chang, Michael Rossini, Michael Sebok e John Sperduto. "Concentration Characterization of Encapsulated Macromolecules in Electrospun Alginate Fibers Using Image Analysis". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52585.

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Abstract (sommario):

Electrospun fibers made of biocompatible polymers have been used as scaffolds in tissue engineering to mimic the fibrous environment found in the extracellular matrix (ECM) of biological tissue; and bioactive macromolecules can also be encapsulated in the electrospun fibers. In order to control the release of these encapsulated macromolecules, it is of great interest to understand how the release rate is affected by the sizes of molecules, cross-linking as well as electrospinning configuration (single axial versus co-axial). Fluorescein imaging technique has been applied in quantifying molecular transport phenomena. This paper presents an image analysis method to establish a baseline correlation between the fluorescent intensity and the macromolecule concentration in the electrospun fibers. In this study, alginate and Poly(ethylene oxide) (PEO) blend polymer aqueous solution (1:1 ratio, 3% w/v) was used to electrospin fibers and fluorescein-isothiocyanate dextran (FITC-dextran) with different molecular weights was chosen as the encapsulated macromolecule. Linear correlation was established based on the statistical analysis of electrospun fiber images, and imaging parameters effects were also identified.

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Long, Timothy E., Casey L. Elkins, Lars Kilian, Taigyoo Park, Scott R. Trenor, Koji Yamauchi, Ralph H. Colby, Donald J. Leo e Brian J. Love. "“Reversible Macromolecules” as Scaffolds for Adaptive Structures". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43010.

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Self-healing macromolecular structures, submicron capsules and fibers with molecular recognition, stimuliresponsive molecules, solvent-free rheological reversibility, multivalency in rational drug design, and the emergence of new fields of adaptive and evolutive chemistry will require a predictive synergy of tailored non-covalent and covalent bonding in molecular design. Supramolecular chemistry has emerged as a stimulating focal point that will enable these scientific and technological discoveries, and biorecognition and biomolecular organization often serve as the inspiration for the future design of supramolecular assemblies. Linear and branched macromolecules are conventionally prepared using unique combinations of step-growth and chain polymerization strategies wherein the repeating units are irreversibly connected using stable covalent bonds. Moreover, optimum physical properties and commercial success of macromolecules are derived from our ability to prepare exceptionally high molecular weights in a controlled fashion. Although high molecular weight linear macromolecules are desirable for the optimization of physical performance and commercial impact, high molecular weights often compromise future solvent-free manufacturing, melt processability, thermal stability, and recyclability of the final products. Our recent efforts have demonstrated the utility of living anionic polymerization techniques to place functionality at desired positions on the polymer backbone. This control allowed investigation of the relationship between topology and tailored functionality, a fundamental investigation that may lead to interesting adaptive and smart applications. Specifically, the synthesis of polyisoprene homopolymers in a variety of topologies was performed, as well as the introduction of complementary hydrogen bonding to diverse families of hydroxyl containing polymeric and monomeric precursors.

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Perkins, F. Keith, L. M. Tender, S. J. Fertig e Martin C. Peckerar. "Sensing macromolecules with microelectronics". In Workshop on Nanostructure Science, Metrology, and Technology, a cura di Martin C. Peckerar e Michael T. Postek, Jr. SPIE, 2002. http://dx.doi.org/10.1117/12.465477.

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Singer, Wolfgang, Timo A. Nieminen, Norman R. Heckenberg e Halina Rubinsztein-Dunlop. "Optical micromanipulation of synthetic macromolecules". In SPIE Optics + Photonics, a cura di Kishan Dholakia e Gabriel C. Spalding. SPIE, 2006. http://dx.doi.org/10.1117/12.680187.

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Pecora, Robert. "Dynamic light scattering from macromolecules". In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, a cura di Ralph J. Nossal, Robert Pecora e Alexander V. Priezzhev. SPIE, 1993. http://dx.doi.org/10.1117/12.148340.

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Ryall, Rosemary L., Alison F. Cook, Lauren A. Thurgood e Phulwinder K. Grover. "Macromolecules Relevant to Stone Formation". In RENAL STONE DISEASE: 1st Annual International Urolithiasis Research Symposium. AIP, 2007. http://dx.doi.org/10.1063/1.2723569.

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Odell, J. A., e A. Keller. "Macromolecules in elongational flow-fields". In AIP Conference Proceedings Volume 137. AIP, 1986. http://dx.doi.org/10.1063/1.35515.

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Chikishev, Andrey Y., Werner Ebeling, Alexei V. Netrebko, Nina V. Netrebko, Yury M. Romanovsky e L. Schimansky-Geier. "Stochastic cluster dynamics of macromolecules". In International Workshop on Nonlinear Dynamics and Structures in Biology and Medicine: Optical and Laser Technologies, a cura di Valery V. Tuchin. SPIE, 1997. http://dx.doi.org/10.1117/12.266255.

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Dantras, E. "Dielectric study of dendritic macromolecules". In Eighth International Conference on Dielectric Materials, Measurements and Applications. IEE, 2000. http://dx.doi.org/10.1049/cp:20000486.

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Rapporti di organizzazioni sul tema "Macromolecules"

Guin, J. A., C. W. Curtis, A. R. Tarrer, S. Kim, D. Hwang, C. C. Chen e Z. Chiou. Configurational diffusion of coal macromolecules. Office of Scientific and Technical Information (OSTI), gennaio 1991. http://dx.doi.org/10.2172/5932140.

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Guin, J. A., C. W. Curtis e A. R. Tarrer. Configurational diffusion of coal macromolecules. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/6132844.

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Guin, J. A., C. W. Curtis e A. R. Tarrer. Configurational diffusion of coal macromolecules. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/5752643.

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Guin, J. A., C. W. Curtis e A. R. Tarrer. Configurational diffusion of coal macromolecules. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/6579694.

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Guin, J., C. Curtis e A. Tarrer. Configurational diffusion of coal macromolecules. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/6933197.

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Guin, J. A., C. W. Curtis e A. R. Tarrer. Configurational diffusion of coal macromolecules. Quarterly progress report. Office of Scientific and Technical Information (OSTI), gennaio 1990. http://dx.doi.org/10.2172/7089749.

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Allcock, Harry R. Organometallic and Bioactive Cyclophosphazenes, and the Relationship to Inorganic Macromolecules. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1989. http://dx.doi.org/10.21236/ada204603.

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Hammel, Michal. Structural analyses of macromolecules by solution scattering (CRADA Final Report). Office of Scientific and Technical Information (OSTI), ottobre 2021. http://dx.doi.org/10.2172/1874024.

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Niedenzu, Kurt. Studies on Macromolecules Derived from Polypyrazolylboron and Related Boron-Nitrogen Species. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1991. http://dx.doi.org/10.21236/ada242588.

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FRINK, LAURA J. D., SUSAN L. REMPE, SHAWN A. MEANS, MARK J. STEVENS, PAUL S. CROZIER, MARCUS G. MARTIN, MARK P. SEARS e HAROLD P. HJALMARSON. Predicting Function of Biological Macromolecules: A Summary of LDRD Activities: Project 10746. Office of Scientific and Technical Information (OSTI), novembre 2002. http://dx.doi.org/10.2172/805869.

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