Conecte-se

Bibliografias temáticas / Ionic aggregation / Artigos de revistas

Artigos de revistas sobre o tema "Ionic aggregation"

Siga este link para ver outros tipos de publicações sobre o tema: Ionic aggregation.

Autor: Grafiati

Publicado: 22 de junho de 2024

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Veja os 50 melhores artigos de revistas para estudos sobre o assunto "Ionic aggregation".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Veja os artigos de revistas das mais diversas áreas científicas e compile uma bibliografia correta.

1

Williams, Claudine E., Thomas P. Russell, Robert Jerome e Jacques Horrion. "Ionic aggregation in model ionomers". Macromolecules 19, n.º 11 (novembro de 1986): 2877–84. http://dx.doi.org/10.1021/ma00165a036.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

2

Ghadamghahi, Maryam, Davood Ajloo e Mahmood Moalem. "Kinetic studies on the self-aggregation of a non ionic porphyrin in the presence and absence of ionic liquid by molecular dynamics simulation". Journal of Porphyrins and Phthalocyanines 16, n.º 10 (outubro de 2012): 1082–93. http://dx.doi.org/10.1142/s1088424612500915.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Aggregation kinetics of a porphyrin derivative in the absence and presence of different concentrations, below and above the critical micelle concentration (CMC) of three ionic liquids (ILs); 1-octyl-3-methylimidazolium, 1-dodecyl-3- methyl imidazolium and 1-octadecyl-3-methylimidazolium chloride was studied using molecular dynamics simulation. Effect of IL, with different chain lengths on the aggregation of a porphyrin derivative, 5,10,15,20-tetrakis(2,5-dihydroxyphenyl)porphyrin, was investigated. The low amount of each ionic liquid (below CMC) observed to favors the formation of aggregates; further increasing ionic liquid concentration leads to the destabilization of aggregates. The compared calculated rate constants also support these results. Aggregation of imidazolium ILs proved to take place with longer alkyl chains that favors aggregation.

3

Szilagyi, Istvan, Tamas Szabo, Anthony Desert, Gregor Trefalt, Tamas Oncsik e Michal Borkovec. "Particle aggregation mechanisms in ionic liquids". Phys. Chem. Chem. Phys. 16, n.º 20 (2014): 9515–24. http://dx.doi.org/10.1039/c4cp00804a.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

4

KUBISA, PRZEMYSLAW, e TADEUSZ BIEDRON. "Aggregation of ionic endgroups in polymers". Polimery 41, n.º 07/08 (julho de 1996): 398–405. http://dx.doi.org/10.14314/polimery.1996.398.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

5

Akhter, M. Salim, e Sadiq M. Alawi. "Aggregation of ionic surfactants in formamide". Colloids and Surfaces A: Physicochemical and Engineering Aspects 173, n.º 1-3 (novembro de 2000): 95–100. http://dx.doi.org/10.1016/s0927-7757(00)00631-2.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

6

Schulz, Peter S., Karola Schneiders e Peter Wasserscheid. "Aggregation behaviour of chiral ionic liquids". Tetrahedron: Asymmetry 20, n.º 21 (novembro de 2009): 2479–81. http://dx.doi.org/10.1016/j.tetasy.2009.10.010.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

7

Hossain, M. Tofazzal, e Yoichi Aso. "Buffers ionic strength on the chaperone-like activity (CLA) of silkworm small heat shock protein: sHSP19.9 and sHSP20.8". Journal of the Bangladesh Agricultural University 12, n.º 2 (12 de julho de 2016): 241–49. http://dx.doi.org/10.3329/jbau.v12i2.28678.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Small heat-shock proteins (sHSPs), an abundant and ubiquitous family of molecular chaperones, can effectively prevent irreversible aggregation of non-native proteins by forming soluble complex. The CLA of sHSPs is usually determined by the capacity to suppress thermally or chemically induced protein aggregation. Various factors can effectively influence the CLA, and among them the ionic strength of the preparation and working buffer is an important factor. The study deals with the effect of ionic strength of buffer on the CLA of two silkworm sHSPs: namely sHSP19.9 and sHSP20.8 against the thermally-induced aggregation of BLC, a non-native protein. The study clearly revealed that sHSP19.9 required high ionic strength (more NaCl concentration) in reaction buffer to prevent irreversible aggregation of BLC. On the other hand, such high ionic strength condition is not necessary for sHSP20.8 but it influences the activity in some context.J. Bangladesh Agril. Univ. 12(2): 241-249, December 2014

8

Cheng, Shijing, Mingqiang Zhang, Tianyu Wu, Sean T. Hemp, Brian D. Mather, Robert B. Moore e Timothy E. Long. "Ionic aggregation in random copolymers containing phosphonium ionic liquid monomers". Journal of Polymer Science Part A: Polymer Chemistry 50, n.º 1 (14 de outubro de 2011): 166–73. http://dx.doi.org/10.1002/pola.25022.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

9

Borah, Priyanka, e Venkata S. K. Mattaparthi. "Effect of Ionic Strength on the Aggregation Propensity of Aβ1-42 Peptide: An In-silico Study". Current Chemical Biology 14, n.º 3 (28 de dezembro de 2020): 216–26. http://dx.doi.org/10.2174/2212796814999200818103157.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Background: Aggregation of misfolded proteins under stress conditions in the cell might lead to several neurodegenerative disorders. Amyloid-beta (Aβ1-42) peptide, the causative agent of Alzheimer’s disease, has the propensity to fold into β-sheets under stress, forming aggregated amyloid plaques. This is influenced by factors such as pH, temperature, metal ions, mutation of residues, and ionic strength of the solution. There are several studies that have highlighted the importance of ionic strength in affecting the folding and aggregation propensity of Aβ1-42 peptide. Objective: To understand the effect of ionic strength of the solution on the aggregation propensity of Aβ1-42 peptide, using computational approaches. Materials and Methods: In this study, Molecular Dynamics (MD) simulations were performed on Aβ1-42 peptide monomer placed in (i) 0 M, (ii) 0.15 M, and (iii) 0.30 M concentration of NaCl solution. To prepare the input files for the MD simulations, we have used the Amberff99SB force field. The conformational dynamics of Aβ1-42 peptide monomer in different ionic strengths of the solutions were illustrated from the analysis of the corresponding MD trajectory using the CPPtraj tool. Results: From the MD trajectory analysis, we observe that with an increase in the ionic strength of the solution, Aβ1-42 peptide monomer shows a lesser tendency to undergo aggregation. From RMSD and SASA analysis, we noticed that Aβ1-42 peptide monomer undergoes a rapid change in conformation with an increase in the ionic strength of the solution. In addition, from the radius of gyration (Rg) analysis, we observed Aβ1-42 peptide monomer to be more compact at moderate ionic strength of the solution. Aβ1-42 peptide was also found to hold its helical secondary structure at moderate and higher ionic strengths of the solution. The diffusion coefficient of Aβ1-42 peptide monomer was also found to vary with the ionic strength of the solution. We observed a relatively higher diffusion coefficient value for Aβ1-42 peptide at moderate ionic strength of the solution. Conclusion: Our findings from this computational study highlight the marked effect of ionic strength of the solution on the conformational dynamics and aggregation propensity of Aβ1-42 peptide monomer.

10

Ogawa, Taku, Nobuhiro Yanai, Saiya Fujiwara, Thuc-Quyen Nguyen e Nobuo Kimizuka. "Aggregation-free sensitizer dispersion in rigid ionic crystals for efficient solid-state photon upconversion and demonstration of defect effects". Journal of Materials Chemistry C 6, n.º 21 (2018): 5609–15. http://dx.doi.org/10.1039/c8tc00977e.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

11

Sousa, Vânia Serrão, e Margarida Ribau Teixeira. "Aggregation kinetics and surface charge of CuO nanoparticles: the influence of pH, ionic strength and humic acids". Environmental Chemistry 10, n.º 4 (2013): 313. http://dx.doi.org/10.1071/en13001.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Environmental context The high demand and use of nanomaterials in commercial products have led to increased concerns about their effect on the environment and human health. Because CuO nanoparticles are widely used in several products, it is necessary to understand and predict their behaviour and fate in the environment. We report a study on the aggregation and surface charge of CuO nanoparticles under environmentally relevant conditions to better predict the mobility and bioavailability of these materials in natural waters. Abstract In this study, the role of pH, ionic strength and humic acids (HAs) on the aggregation kinetics and surface charge of commercial copper oxide (CuO) nanoparticles were examined. Results show that the aggregation of CuO nanoparticles is favoured near pH 10, which was determined as the isoelectric point where the hydrodynamic diameter of the aggregates is the greatest. The aggregation of CuO nanoparticles is also ionic strength dependent. The increase in the ionic strength reduces the zeta potential, which leads to an increase in aggregation until 0.15M. After this point an increase in ionic strength has no influence on aggregation. In the presence of HA for concentrations below 4mgCL–1, aggregation was enhanced for acidic to neutral pH, whereas for higher concentrations, at all pH tested, aggregation does not change. The influence of HA on CuO nanoparticles is due to steric and electrostatic interactions. The sedimentation rates of CuO nanoparticles showed a relation between particle diameter and zeta potentials values confirmed by Derjaguin–Landau–Verwey–Overbeek calculations. The results obtained have important implications for predicting the stability and fate of CuO nanoparticles in natural water.

12

Rezaee Nezhad, Eshagh, Fariba Heidarizadeh, Sami Sajjadifar e Zahra Abbasi. "Dispersing of Petroleum Asphaltenes by Acidic Ionic Liquid and Determination by UV-Visible Spectroscopy". Journal of Petroleum Engineering 2013 (26 de março de 2013): 1–5. http://dx.doi.org/10.1155/2013/203036.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Nowadays, constructing a mechanism to prevent the aggregation petroleum asphaltenes by the use of new acidic ionic liquids has become of fundamental importance. In this research, 3-(2-carboxybenzoyl)-1-methyl-1H-imidazol-3-ium chloride ([CbMIM] [Cl]) and other ionic liquids such as [CbMIM]BF4, [HMIM]Cl, [BMIM]Br, and [HMIM]HSO4 were tested. It should be noted that during the experiment the presence of the acidic ionic liquid moiety enhanced interactions between asphaltenes and acidic ionic liquids and it greatly limited asphaltene aggregation. We considered parameters such as temperature, amount of dispersant, effect of water: toluene ratio, the stirring time and effects of other ionic liquids, and determination of concentration of petroleum asphaltenes after dispersing by acidic ionic liquid under various parameters using UV-Visible spectroscopy.

13

Ziaunys, Mantas, Kamile Mikalauskaite, Andrius Sakalauskas e Vytautas Smirnovas. "Interplay between epigallocatechin-3-gallate and ionic strength during amyloid aggregation". PeerJ 9 (22 de outubro de 2021): e12381. http://dx.doi.org/10.7717/peerj.12381.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

The formation and accumulation of protein amyloid aggregates is linked with multiple amyloidoses, including neurodegenerative Alzheimer’s or Parkinson’s disease. The mechanism of such fibril formation is impacted by various environmental conditions, which greatly complicates the search for potential anti-amyloid compounds. One of these factors is solution ionic strength, which varies between different aggregation protocols during in vitro drug screenings. In this work, we examine the interplay between ionic strength and a well-known protein aggregation inhibitor—epigallocatechin-3-gallate. We show that changes in solution ionic strength have a major impact on the compound’s inhibitory effect, reflected in both aggregation times and final fibril structure. We also observe that this effect is unique to different amyloid-forming proteins, such as insulin, alpha-synuclein and amyloid-beta.

14

Ziaunys, Mantas, Andrius Sakalauskas, Kamile Mikalauskaite e Vytautas Smirnovas. "Polymorphism of Alpha-Synuclein Amyloid Fibrils Depends on Ionic Strength and Protein Concentration". International Journal of Molecular Sciences 22, n.º 22 (17 de novembro de 2021): 12382. http://dx.doi.org/10.3390/ijms222212382.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Protein aggregate formation is linked with multiple amyloidoses, including Alzheimer‘s and Parkinson‘s diseases. Currently, the understanding of such fibrillar structure formation and propagation is still not sufficient, the outcome of which is a lack of potent, anti-amyloid drugs. The environmental conditions used during in vitro protein aggregation assays play an important role in determining both the aggregation kinetic parameters, as well as resulting fibril structure. In the case of alpha-synuclein, ionic strength has been shown as a crucial factor in its amyloid aggregation. In this work, we examine a large sample size of alpha-synuclein aggregation reactions under thirty different ionic strength and protein concentration combinations and determine the resulting fibril structural variations using their dye-binding properties, secondary structure and morphology. We show that both ionic strength and protein concentration determine the structural variability of alpha-synuclein amyloid fibrils and that sometimes even identical conditions can result in up to four distinct types of aggregates.

15

Li, Na, Shaohua Zhang, Liqiang Zheng, Bin Dong, Xinwei Li e Li Yu. "Aggregation behavior of long-chain ionic liquids in an ionic liquid". Physical Chemistry Chemical Physics 10, n.º 30 (2008): 4375. http://dx.doi.org/10.1039/b807339b.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

16

Lu, Xinya, W. P. Steckle e R. A. Weiss. "Ionic aggregation in a block copolymer ionomer". Macromolecules 26, n.º 22 (outubro de 1993): 5876–84. http://dx.doi.org/10.1021/ma00074a008.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

17

Myrzahmet, M. K., e K. S. Baktybekov. "Aggregation of impurity centers in ionic crystals". Russian Physics Journal 50, n.º 2 (fevereiro de 2007): 165–69. http://dx.doi.org/10.1007/s11182-007-0023-6.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

18

Li, Zhiyong, Ying Feng, Xiaoqing Yuan, Huiyong Wang, Yuling Zhao e Jianji Wang. "Photo-Triggered Reversible Phase Transfer of Azobenzene-Based Ionic Liquid Surfactants between Oil and Water". International Journal of Molecular Sciences 20, n.º 7 (4 de abril de 2019): 1685. http://dx.doi.org/10.3390/ijms20071685.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

The reversible phase transfer of compounds between two immiscible liquid phases has many applications in a wide range of fields, and ionic liquids have been widely used as potential functional solvents and catalysts. However, photo-triggered reversible phase transfer of ionic liquids between the organic phase and water phase has not been reported so far. In the present work, the reversible phase transfer of six kinds of azobenzene-based ionic liquid surfactants between the organic phase and water phase is investigated by alternative irradiation of UV and visible light. Factors affecting the transfer efficiency, such as chemical structure and concentration of the ionic liquid surfactants, equilibrium photo-isomerization degree, and the aggregation state of ionic liquid surfactants are investigated in detail. It is shown that transfer efficiency greater than 89% was achieved under optimal conditions, equilibrium photo-isomerization degree of the ionic liquid surfactants is the main factor to determine their transfer efficiencies, and the aggregation of cis-isomers is not beneficial for the transfer.

19

Twum, Kwaku, Avik Bhattacharjee, Erving T. Laryea, Josephine Esposto, George Omolloh, Shaelyn Mortensen, Maya Jaradi et al. "Functionalized resorcinarenes effectively disrupt the aggregation of αA66-80 crystallin peptide related to cataracts". RSC Medicinal Chemistry 12, n.º 12 (2021): 2022–30. http://dx.doi.org/10.1039/d1md00294e.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Ionic resorcinarenes successfully disrupt the aggregation of αA66-80 crystallin peptide related to cataracts. The results show functionalized resorcinarenes as potential agents to reverse the aggregation of α-crystallin dominant in eye cataracts.

20

Meisl, Georg, Xiaoting Yang, Christopher M. Dobson, Sara Linse e Tuomas P. J. Knowles. "Modulation of electrostatic interactions to reveal a reaction network unifying the aggregation behaviour of the Aβ42 peptide and its variants". Chemical Science 8, n.º 6 (2017): 4352–62. http://dx.doi.org/10.1039/c7sc00215g.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

The aggregation of Aβ42, linked to Alzheimer's disease, can be altered significantly by variations of the ionic strength of the solution, providing a means to relate the differences in aggregation mechanism of other Ab variants to changes in electrostatic interactions.

21

Kwan, Chiu-Yin. "Aggregation of smooth muscle membranes and its use in the preparation of plasma membrane enriched fraction from gastric fundus smooth muscle". Biochemistry and Cell Biology 64, n.º 6 (1 de junho de 1986): 535–42. http://dx.doi.org/10.1139/o86-075.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Microsomal membranes isolated from rat gastric fundus smooth muscle by differential centrifugation aggregate substantially in the presence of the divalent metal ion Mg2+ or Ca2+. The magnitude of cation-induced membrane aggregation is higher for Ca2+ than for Mg2+, but the ion concentration required for half-maximum membrane aggregation (K0.5 value) is similar for Mg2+ and Ca2+. Cation-induced membrane aggregation is suppressed by high ionic strength and low pH of the medium. Cation-induced membrane aggregation of mitochondrial membrane and plasma membrane enriched fractions differ in the rate of aggregate formation, metal ion concentration dependence, and pH dependence. Such different properties of membrane aggregation were used to prepare a plasma membrane enriched fraction by conventional differential centrifugation. Subfractionation of the heterogenous microsomal membranes by free-flow electrophoresis indicated that smooth muscle plasma membranes showed a higher electrophoretic mobility than the intracellular membranes. These results suggest that ionic interactions on the cell membrane surfaces differ from those on the intracellular membrane surfaces and that induction of membrane aggregation by Ca2+ or Mg2+ is a useful procedure for an effective and rapid preparation of plasma membrane enriched fraction from smooth muscle.

22

Li, Qintang, Kun Tong, Meng Sun, Meihuan Yao, Wenchang Zhuang, Yue Pan e Xiao Chen. "The self-assembly of an imidazolium surfactant in an aprotic ionic liquid. 1. Comparison in aprotic and protic ionic liquids". Soft Matter 16, n.º 31 (2020): 7246–49. http://dx.doi.org/10.1039/d0sm01246g.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

23

Wang, Yanting, e Gregory A. Voth. "Tail Aggregation and Domain Diffusion in Ionic Liquids". Journal of Physical Chemistry B 110, n.º 37 (setembro de 2006): 18601–8. http://dx.doi.org/10.1021/jp063199w.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

24

Vieira, Nicole S. M., Joana C. Bastos, Carolina Hermida-Merino, María J. Pastoriza-Gallego, Luís P. N. Rebelo, Manuel M. Piñeiro, João M. M. Araújo e Ana B. Pereiro. "Aggregation and phase equilibria of fluorinated ionic liquids". Journal of Molecular Liquids 285 (julho de 2019): 386–96. http://dx.doi.org/10.1016/j.molliq.2019.04.086.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

25

Balevicius, Vytautas, Zofia Gdaniec, Vytautas Klimavicius, Arunas Masalka e Janez Plavec. "NMR monitoring of nonequilibrium aggregation in ionic solutions". Chemical Physics Letters 503, n.º 4-6 (fevereiro de 2011): 235–38. http://dx.doi.org/10.1016/j.cplett.2011.01.035.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

26

Bowers, James, Craig P. Butts, Pamela J. Martin, Marcos C. Vergara-Gutierrez e Richard K. Heenan. "Aggregation Behavior of Aqueous Solutions of Ionic Liquids". Langmuir 20, n.º 6 (março de 2004): 2191–98. http://dx.doi.org/10.1021/la035940m.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

27

Vanzieleghem, Thomas, Numa Couniot, Philippe Herman-Bausier, Denis Flandre, Yves F. Dufrêne e Jacques Mahillon. "Role of Ionic Strength in Staphylococcal Cell Aggregation". Langmuir 32, n.º 29 (14 de julho de 2016): 7277–83. http://dx.doi.org/10.1021/acs.langmuir.6b00499.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

28

Kogelnig, Daniel, Anja Stojanovic, Frank v.d. Kammer, Peter Terzieff, Markus Galanski, Franz Jirsa, Regina Krachler, Thilo Hofmann e Bernhard K. Keppler. "Tetrachloroferrate containing ionic liquids: Magnetic- and aggregation behavior". Inorganic Chemistry Communications 13, n.º 12 (dezembro de 2010): 1485–88. http://dx.doi.org/10.1016/j.inoche.2010.08.023.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

29

Wang, Jianji, e Huiyong Wang. "ChemInform Abstract: Aggregation in Systems of Ionic Liquids". ChemInform 46, n.º 42 (outubro de 2015): no. http://dx.doi.org/10.1002/chin.201542262.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

30

Hakim, Azizul, Ferdouse Zaman Tanu e Sabrina Sharmeen Alam. "Interaction, Adhesion and Aggregation of Microplastic/Nanoplastic Particles: Effects of Plastic Polymer Type". Asian Journal of Water, Environment and Pollution 20, n.º 5 (9 de outubro de 2023): 17–24. http://dx.doi.org/10.3233/ajw230061.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Microplastics (MP; <5 mm) and nanoplastics (NP; <1000 nm) are now ubiquitous in nature as they have been released into inland water, lakes, rivers, and marine water through direct discharge, runoff from upland watersheds, and other terrestrial environments. To understand the aggregation of MP and NP in the last decade, surveys and analytical efforts were undertaken. The MP and NP particles in the soil and water environments interact with other natural and engineered nanoparticles, which in turn form aggregates. These plastic particles could form homoaggregates and/or heteroaggregates depending on pH, ionic type, ionic valence, salt concentration, shape and size of the plastic particles, and the polymer type of MP. Differences in MP aggregation due to differences in plastic polymer type are not yet well documented. This review is conducted to investigate the effect of polymer type on the aggregation of MP and NP particles in the presence of various aggregation conditions.

31

Huang, T. F., C. Z. Liu e S. H. Yang. "Aggretin, a novel platelet-aggregation inducer from snake (Calloselasma rhodostoma) venom, activates phospholipase C by acting as a glycoprotein Ia/IIa agonist". Biochemical Journal 309, n.º 3 (1 de agosto de 1995): 1021–27. http://dx.doi.org/10.1042/bj3091021.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

A potent platelet aggregation inducer, aggretin, was purified from Malayan-pit-viper (Calloselasma rhodostoma) venom by ionic-exchange chromatography, gel-filtration chromatography and HPLC. It is a heterodimeric protein (29 kDa) devoid of esterase, phospholipase A and thrombin-like activity. Aggretin (> 5 nM) elicited platelet aggregation with a lag period in both human platelet-rich plasma and washed platelet suspension. EDTA (5 mM), prostaglandin E1 (1 microM) and 3,4,5-trimethoxybenzoic acid 8-(diethylamino)octyl ester (‘TMB-8’; 100 microM) abolished its aggregating activity, indicating that exogenous bivalent cations and intracellular Ca2+ mobilization are essential for aggretin-induced platelet aggregation. Neomycin (4 mM) and mepacrine (50 microM) completely inhibited aggretin (33 nM)-induced aggregation; however, creatine phosphate/creatine phosphokinase (5 mM, 5 units/ml) and indomethacin (50 microM) did not significantly affect its aggregating activity. Aggretin caused a significant increase of [3H]InsP formation in [3H]Ins-loaded platelets, intracellular Ca2+ mobilization and thromboxane B2 formation. Neomycin, a phospholipase C inhibitor, completely inhibited both the increase of [3H]InsP and intracellular Ca2+ mobilization of platelets stimulated by aggretin. A monoclonal antibody (6F1) directed against glycoprotein Ia/IIa inhibited platelet shape change and aggregation induced by aggretin. 125I-aggretin bound to platelets with a high affinity (Kd = 4.0 +/- 1.1 nM), and the number of binding sites was estimated to be 2119 +/- 203 per platelet. It is concluded that aggretin may act as a glycoprotein Ia/IIa agonist to elicit platelet aggregation through the activation of endogenous phospholipase C, leading to hydrolysis of phosphoinositides and subsequent intracellular Ca2+ mobilization.

32

Escudero, Carlos, Alessandro D'Urso, Rosaria Lauceri, Carmela Bonaccorso, Domenico Sciotto, Santo Di Bella, Zoubir El-Hachemi, Joaquim Crusats, Josep M. Ribó e Roberto Purrello. "Hierarchical dependence of porphyrin self-aggregation: controlling and exploiting the complexity". Journal of Porphyrins and Phthalocyanines 14, n.º 08 (agosto de 2010): 708–12. http://dx.doi.org/10.1142/s1088424610002525.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Self-aggregation processes are rarely reproducible owing to their dependence on various experimental parameters (aging of stock solutions, their concentration, concentration of working solutions, ionic strength, etc.). However, by enucleating the dependence from one parameter (in this case, the dependence of aggregation from the concentration of the working solutions), it has been possible to hierarchically control self-aggregation of the protonated form of tetrakis-(4-sulfonatophenyl)-porphyrin.

33

Oncsik, Tamas, Anthony Desert, Gregor Trefalt, Michal Borkovec e Istvan Szilagyi. "Charging and aggregation of latex particles in aqueous solutions of ionic liquids: towards an extended Hofmeister series". Physical Chemistry Chemical Physics 18, n.º 10 (2016): 7511–20. http://dx.doi.org/10.1039/c5cp07238g.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

34

McCutchen, Michael, Lang G. Chen, Harry Bermudez e Silvina Matysiak. "Interplay of Dynamical Properties between Ionic Liquids and Ionic Surfactants: Mechanism and Aggregation". Journal of Physical Chemistry B 119, n.º 30 (10 de julho de 2015): 9925–32. http://dx.doi.org/10.1021/acs.jpcb.5b05151.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

35

Zhuang, Wenchang, Chunhua Zhao, Yue Pan e Qintang Li. "Self-assembly of an imidazolium surfactant in aprotic ionic liquids. 2. More than solvents". Soft Matter 17, n.º 12 (2021): 3494–502. http://dx.doi.org/10.1039/d1sm00039j.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

36

Lang, Xuye, e Julia G. Lyubovitsky. "Structural dependency of collagen fibers on ion types revealed by in situ second harmonic generation (SHG) imaging method". Analytical Methods 7, n.º 5 (2015): 1680–90. http://dx.doi.org/10.1039/c4ay02242d.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

37

Huang, Pei-Yi, Jhen-Yan Gao, Cheng-Yu Song e Jin-Long Hong. "Ionic complex of a rhodamine dye with aggregation-induced emission properties". Faraday Discussions 196 (2017): 177–90. http://dx.doi.org/10.1039/c6fd00146g.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

An AIE-active rhodamine based luminogen was prepared via a complexation reaction between non-emissive rhodamine hydrazide (RdH) and bulky camphorsulfonic acid (CSA). Besides acting to open the spirolactam ring of RdH, CSA also imposes a rotational restriction on the resultant ionic complex, RdH(CSA)_x. Without CSA, the analogous complex RdH(HCl)₃ is a luminogen with aggregation-caused quenching (ACQ) properties. The ionic bonds of RdH(CSA)₃ are sensitive to several external stimuli and therefore it is a luminescent sensor for metal ions, organic amines and the blood protein bovine serum albumin (BSA). Besides being a sensor for BSA, the ionic RdH(CSA)₃ is also a denaturant capable of uncoiling the peptide chain of BSA.

38

Marium, Mayeesha, M. Muhibur Rahman, M. Yousuf A. Mollah e Md Abu Bin Hasan Susan. "Molecular level interactions in binary mixtures of 1-ethyl 3-methylimidazolium tetrafluoroborate and water". RSC Advances 5, n.º 26 (2015): 19907–13. http://dx.doi.org/10.1039/c5ra00083a.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

39

Zhu, Guanglai, Xianqu Kang, Siwen Zhou, Xiaoshuan Tang, Maolin Sha, Zhifeng Cui e Xinsheng Xu. "Molecular insight into the microstructure and microscopic dynamics of pyridinium ionic liquids with different alkyl chains based on temperature response". RSC Advances 7, n.º 9 (2017): 4896–903. http://dx.doi.org/10.1039/c6ra26866h.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

40

Yang, Jie, Huiyong Wang, Jianji Wang, Xiaojia Guo e Yue Zhang. "Light-modulated aggregation behavior of some unsubstituted cinnamate-based ionic liquids in aqueous solutions". RSC Advances 5, n.º 117 (2015): 96305–12. http://dx.doi.org/10.1039/c5ra20772j.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

41

Wang, Teng-Hui, Li-Wen Hsu e Hai-Chou Chang. "Structural Reorganization of Imidazolium Ionic Liquids Induced by Pressure-Enhanced Ionic Liquid—Polyethylene Oxide Interactions". International Journal of Molecular Sciences 22, n.º 2 (19 de janeiro de 2021): 981. http://dx.doi.org/10.3390/ijms22020981.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Mixtures of polyethylene oxide (PEO, M.W.~900,000) and imidazolium ionic liquids (ILs) are studied using high-pressure Fourier-transform infrared spectroscopy. At ambient pressure, the spectral features in the C–H stretching region reveal that PEO can disturb the local structures of the imidazolium rings of [BMIM]+ and [HMIM]+. The pressure-induced phase transition of pure 1-butyl-3-methylimidazolium bromide ([BMIM]Br) is observed at a pressure of 0.4 GPa. Pressure-enhanced [BMIM]Br-PEO interactions may assist PEO in dividing [BMIM]Br clusters to hinder the aggregation of [BMIM]Br under high pressures. The C–H absorptions of pure 1-hexyl-3-methylimidazolium bromide [HMIM]Br do not show band narrowing under high pressures, as observed for pure [BMIM]Br. The band narrowing of C–H peaks is observed at 1.5 GPa for the [HMIM]Br-PEO mixture containing 80 wt% of [HMIM]Br. The presence of PEO may reorganize [HMIM]Br clusters into a semi-crystalline network under high pressures. The differences in aggregation states for ambient-pressure phase and high-pressure phase may suggest the potential of [HMIM]Br-PEO (M.W.~900,000) for serving as optical or electronic switches.

42

Prasad, Suchita, Katharina Achazi, Christoph Böttcher, Rainer Haag e Sunil K. Sharma. "Fabrication of nanostructures through self-assembly of non-ionic amphiphiles for biomedical applications". RSC Advances 7, n.º 36 (2017): 22121–32. http://dx.doi.org/10.1039/c6ra28654b.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

43

Bhaskar, K. R., D. H. Gong, R. Bansil, S. Pajevic, J. A. Hamilton, B. S. Turner e J. T. LaMont. "Profound increase in viscosity and aggregation of pig gastric mucin at low pH". American Journal of Physiology-Gastrointestinal and Liver Physiology 261, n.º 5 (1 de novembro de 1991): G827—G832. http://dx.doi.org/10.1152/ajpgi.1991.261.5.g827.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Epithelial mucins are glycoproteins of very large molecular weight that provide viscoelastic and gel-forming properties to mucus, the jellylike protective layer covering epithelial organs. In the mammalian stomach the mucus gel layer protects the underlying epithelial cells from HCl in the lumen. We report here that pig gastric mucin undergoes a 100-fold increase in viscosity in vitro when pH is lowered from 7 to 2. Sedimentation velocity and dynamic light-scattering measurements revealed the formation of extremely large aggregates at low pH consistent with the observed increase in viscosity. Aggregation of mucin at low pH was prevented by increasing the ionic strength, suggesting the involvement of electrostatic interactions. Trypsin digestion and thiol reduction, but not enzymatic removal of neuraminic acid, prevented aggregation at low pH. This implies that the peptide core rather than the oligosaccharide side chains of the molecule is involved in the aggregation of mucin at low pH. Increased aggregation and viscosity at low pH were also observed in a solvent made to mimic the ionic composition of gastric juice, indicating the physiological relevance of our findings. Our observations suggest that one mechanism of gastric protection may be the ability of gastric mucin to undergo aggregation with a marked increase in viscosity at low pH.

44

Dandpat, Shiba Sundar, e Moloy Sarkar. "Investigating the molecular and aggregated states of a drug molecule rutaecarpine using spectroscopy, microscopy, crystallography and computational studies". Physical Chemistry Chemical Physics 17, n.º 21 (2015): 13992–4002. http://dx.doi.org/10.1039/c5cp01980j.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

45

Hu, Ting, Bicheng Yao, Xiujuan Chen, Weizhang Li, Zhegang Song, Anjun Qin, Jing Zhi Sun e Ben Zhong Tang. "Effect of ionic interaction on the mechanochromic properties of pyridinium modified tetraphenylethene". Chemical Communications 51, n.º 42 (2015): 8849–52. http://dx.doi.org/10.1039/c5cc02138c.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

Resumo:

Introducing ionic interaction into a soft tetraphenylethene-based AIE-molecule furnished the compound with robust mechanochromic effects while exhibiting aggregation-induced emission enhancement properties.

46

Chen, Lang G., e Harry Bermudez. "Solubility and Aggregation of Charged Surfactants in Ionic Liquids". Langmuir 28, n.º 2 (5 de janeiro de 2012): 1157–62. http://dx.doi.org/10.1021/la2040399.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

47

Sajjadi, Hossein, Ali Modaressi, Pierre Magri, Urszula Domańska, Michèle Sindt, Jean-Luc Mieloszynski, Fabrice Mutelet e Marek Rogalski. "Aggregation of nanoparticles in aqueous solutions of ionic liquids". Journal of Molecular Liquids 186 (outubro de 2013): 1–6. http://dx.doi.org/10.1016/j.molliq.2013.04.025.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

48

Florindo, Catarina, Liliana C. Tomé e Isabel M. Marrucho. "Thermodynamic Study of Aggregation of Cholinium Perfluoroalkanoate Ionic Liquids". Journal of Chemical & Engineering Data 61, n.º 12 (17 de novembro de 2016): 3979–88. http://dx.doi.org/10.1021/acs.jced.6b00455.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

49

Rao, Soniya S., e Shridhar P. Gejji. "Molecular insights accompanying aggregation in amino acid ionic liquids". Computational and Theoretical Chemistry 1057 (abril de 2015): 24–38. http://dx.doi.org/10.1016/j.comptc.2015.01.012.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

50

Wintgens, Véronique, Clémence Le Coeur, Catherine Amiel, Jean-Michel Guigner, József G. Harangozó, Zsombor Miskolczy e László Biczók. "4-Sulfonatocalix[6]arene-Induced Aggregation of Ionic Liquids". Langmuir 29, n.º 25 (4 de junho de 2013): 7682–88. http://dx.doi.org/10.1021/la401185p.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.