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aggregation of vesicles :

Aggregation of phospholipid vesicles by water-soluble ...

1996-11-1  Aggregation of large unilamellar vesicles required a lower polymer concentration, probably because aggregation occurs in a secondary minimum (without surface contact). In contrast to experiments in which the polymers were added directlyto the vesicles, dialysis ofthe vesicles against polymer-containing solutions did not induce aggregation.

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Aggregation of phospholipid vesicles by water-soluble ...

Increasing the molecular weight of the polymers resulted in a reduction of the concentration of polymer needed for induction of aggregation of small unilamellar vesicles. The aggregation was fully reversible (by dilution), within a few seconds, up to a polymer concentration of at least 20 wt %.

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Self-limiting aggregation of phospholipid vesicles - Soft ...

Vesicle aggregation experiments using cationic polymers were performed in a similar way to those with biotin and streptavidin: we started with single vesicles and stepwise added linker molecules to induce aggregation. The linker molecule here is the polycation poly-l-lysine (PLL). We continued the addition of PLL until unlimited aggregation was ...

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Self-limiting aggregation of phospholipid vesicles

vesicles to slow down the aggregation rate. 29 The electrostatic repulsion between vesicles obtained through the charges creates an energy barrier for aggregation, which reduces the amount of successful vesicle collisions. The range of electrostatic repulsion is governed by

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Aggregation of phospholipid vesicles by water-soluble

2012-10-6  Interaction of Polymerswith Vesicles andKinnunen, 1994). Thiseffect, as well asthe influence of PEGon lipid transfer between bilayers and the leakage of water-soluble substances entrappedwithinthe vesicles, may ofcourse be related to vesicle aggregation (Wuand Lentz, 1991). However, the PEG concentrations at which these processes were observed are higher than CA, as evaluated from the

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Vesicle aggregation in aqueous mixtures of negatively ...

2019-12-9  Vesicles aggregation occurs frequently in such systems, however, compared with liposome systems, investigations of vesicle aggregation and fusion in syn-thetic surfactant system were rather scarce [6,21,22]. Thus fur-ther systematic studies of environmental factors induced vesicle aggregation are necessary to understand how the factors work

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Lipid Vesicle Aggregation Induced by Cooling

2010-2-21  Aggregation and fusion of vesicles, moreover, can be expected to depend on concentration. The concentrations of vesicles used in our light scattering measurements were as much as three orders of magnitude smaller than those reported previously [14–17]. The low concentration of our vesicles appears to make any tendency to aggregate or fuse at ...

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Phospholipid vesicle aggregation: effect of monovalent

2020-12-1  Cation-induced aggregation of acidic phospholipid vesicles: the role of fatty acid unsaturation and cholesterol. Chemistry and Physics of Lipids 1991 , 57 (1) , 59-66.

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Aggregation and fusion of vesicles composed of N

NPPS liposomes aggregate at lower concentrations of divalent cations than NPPE liposomes, but with sodium NPPE liposomes aggregate to a higher extent than NPPS liposomes. The reaction order for the aggregation processes depends on the lipid and the cation nature and range from 1.04 to 1.64.

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Aggregation of amphiphiles as micelles or vesicles in ...

For vesicles, the repulsion caused by the overlapping electrical double layers inside the vesicles is also considered. The expressions established for the various free energy changes associated with aggregation are used to examine the formation of micelles and vesicles, from single and double chain amphiphiles with nonionic, ionic, or ...

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Aggregation of phospholipid vesicles by water-soluble ...

The extent of aggregation was similar at 37 and 4 degrees C. Aggregation of large unilamellar vesicles required a lower polymer concentration, probably because aggregation occurs in a secondary minimum (without surface contact).

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Self-limiting aggregation of phospholipid vesicles

vesicles to slow down the aggregation rate. 29 The electrostatic repulsion between vesicles obtained through the charges creates an energy barrier for aggregation, which reduces the amount of successful vesicle collisions. The range of electrostatic repulsion is governed by

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Aggregation of dipalmitoylphosphatidylcholine vesicles.

1982-8-17  Aggregation of dipalmitoylphosphatidylcholine vesicles. Wong M, Thompson TE. Quasi-elastic and 90 degrees light scattering were used to study the aggregation of dipalmitoylphosphatidylcholine vesicles at temperatures below the gel-liquid-crystalline phase transition as a function of concentration, temperature, and size.

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Aggregation of phospholipid vesicles by water-soluble

2012-10-6  Interaction of Polymerswith Vesicles andKinnunen, 1994). Thiseffect, as well asthe influence of PEGon lipid transfer between bilayers and the leakage of water-soluble substances entrappedwithinthe vesicles, may ofcourse be related to vesicle aggregation (Wuand Lentz, 1991). However, the PEG concentrations at which these processes were observed are higher than CA, as evaluated from the

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Interaction and aggregation of lipid vesicles (DLVO theory ...

1999-8-1  Such vesicle aggregation studies have been done by several workers , , and the order of ability of ions to induce vesicle aggregation have been found for vesicles of different types of lipids , , . There exist various forces (electrostatic, van der Waals, hydration interactions, etc.) in stability of lipid vesicle suspension.

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Interaction and aggregation of lipid vesicles (DLVO theory ...

The experimental results of aggregation of vesicles induced by monovalent cations (Na +, K +, Cs + and TMA +) were explained well in terms of the interaction energy of two interacting vesicles using the ordinary Derjaguin–Landau–Verwey–Overbeek (DLVO) theory for both small and large lipid vesicles.

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Directed aggregation and fusion of lipid vesicles induced ...

2008-10-1  Vesicle fusion induced by the aggregation of DNA-tethered vesicles. Vesicles with DNA-surfactant 7 containing α-chymotrypsin and vesicles with DNA-surfactant 8 containing FITC-labeled casein were mixed, followed by 24 h incubation. (A) Bright field microscopic image, (B) fluorescent microscopic image.

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Aggregation and fusion of vesicles composed of N

NPPS liposomes aggregate at lower concentrations of divalent cations than NPPE liposomes, but with sodium NPPE liposomes aggregate to a higher extent than NPPS liposomes. The reaction order for the aggregation processes depends on the lipid and the cation nature and range from 1.04 to 1.64.

More

Aggregation of amphiphiles as micelles or vesicles in ...

For vesicles, the repulsion caused by the overlapping electrical double layers inside the vesicles is also considered. The expressions established for the various free energy changes associated with aggregation are used to examine the formation of micelles and vesicles, from single and double chain amphiphiles with nonionic, ionic, or ...

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Aggregation of Amphiphilic Molecules Into Micelles ...

2008-5-30  Aggregation of Amphiphilic Molecules Into Micelles, Bilayers, Vesicles And Biological Membranes Colloids, Chapter 17. ... ¾Monomers, micelles, and vesicles separate out in equilibrium ¾This can take a very long time. Optimal headgroup area ¾The major force : hydrophobic attraction

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Aggregation of dipalmitoylphosphatidylcholine vesicles ...

2002-5-1  Phospholipase C-induced aggregation and fusion of cholesterol-lecithin small unilamellar vesicles. Biochemistry 1993, 32 (27) , 6965-6973. DOI: 10.1021/bi00078a022. Anthony W. Scotto and Matthew E. Gompper. Spontaneous incorporation of bacteriorhodopsin into large preformed vesicles.

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Aggregation of dipalmitoylphosphatidylcholine vesicles.

1982-8-17  Aggregation of dipalmitoylphosphatidylcholine vesicles. Wong M, Thompson TE. Quasi-elastic and 90 degrees light scattering were used to study the aggregation of dipalmitoylphosphatidylcholine vesicles at temperatures below the gel-liquid-crystalline phase transition as a function of concentration, temperature, and size.

More

Interaction and aggregation of lipid vesicles (DLVO theory ...

The experimental results of aggregation of vesicles induced by monovalent cations (Na +, K +, Cs + and TMA +) were explained well in terms of the interaction energy of two interacting vesicles using the ordinary Derjaguin–Landau–Verwey–Overbeek (DLVO) theory for both small and large lipid vesicles.

More

Aggregation and fusion of vesicles composed of N

NPPS liposomes aggregate at lower concentrations of divalent cations than NPPE liposomes, but with sodium NPPE liposomes aggregate to a higher extent than NPPS liposomes. The reaction order for the aggregation processes depends on the lipid and the cation nature and range from 1.04 to 1.64.

More

Lipid Vesicle Aggregation Induced by Cooling

2014-6-19  Aggregation of DSPC vesicles was confirmed by direct visual observation. Orientation of lipid head groups parallel to the plane of the bilayer and consequent reduction of the negative surface charge can account for the ability of DPPC and DSPC vesicles to aggregate. Retention of negatively charged phosphates on the surface and the burial of

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AC field induced two-dimensional aggregation of ...

The aggregation of 2D colloidal crystals can be performed by applying an AC field to a colloidal dispersion. This technique is used in this work for assembling multilamellar vesicles in suspension. The dynamics of the aggregation is followed by real-time recording of the pictures of the microsphere assembly through a phase contrast microscope. The influence of both the frequency and the ...

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Temperature-Controlled Vesicle Aggregation in the Mixed ...

2021-3-12  Temperature-controlled vesicle aggregation was investigated in a catanionic surfactant system of sodium n-dodecyl sulfate/n-dodecyltributylammonium bromide. Vesicle aggregation took place as the temperature reached the critical value (Tc). Tc can be adjusted by the variations of the total surfactant concentration and the mixed molar ratio. It was also found that the temperature variation

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Detection of Aggregation-Competent Tau in Neuron

2018-8-17  International Journal of Molecular Sciences Article Detection of Aggregation-Competent Tau in Neuron-Derived Extracellular Vesicles Francesc X. Guix 1,†, Grant T. Corbett 1,† ID, Diana J. Cha 1, Maja Mustapic 2 ID, Wen Liu 1, David Mengel 1, Zhicheng Chen 1, Elena Aikawa 3, Tracy Young-Pearse 1, Dimitrios Kapogiannis 2, Dennis J. Selkoe 1 and Dominic M. Walsh 1,* 1 Laboratory for ...

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Small molecule-mediated stabilization of vesicle ...

2014-12-19  The distinct aggregation behaviour of the Y39A variant of αSyn in solution and when bound to vesicles demonstrates that the early stages of aggregation differ drastically between the free ...

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Aggregation of Amphiphilic Molecules Into Micelles ...

2008-5-30  Aggregation of Amphiphilic Molecules Into Micelles, Bilayers, Vesicles And Biological Membranes Colloids, Chapter 17. ... ¾Monomers, micelles, and vesicles separate out in equilibrium ¾This can take a very long time. Optimal headgroup area ¾The major force : hydrophobic attraction

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