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- Ernesto Hernández-Zapata, Luciano Martínez-Balbuena, Iván Santamaría-Holek
- Journal of biological physics
- 2009

We propose a free energy expression accounting for the formation of spherical vesicles from planar lipid membranes and derive a Fokker-Planck equation for the probability distribution describing the dynamics of vesicle formation. We find that formation may occur as an activated process for small membranes and as a transport process for sufficiently large… (More)

- I Santamaría-Holek, Carlos I Mendoza
- Journal of colloid and interface science
- 2010

We propose an improved effective-medium theory to obtain the concentration dependence of the viscosity of particle suspensions at arbitrary volume fractions. Our methodology can be applied, in principle, to any particle shape as long as the intrinsic viscosity is known in the dilute limit and the particles are not too elongated. The procedure allows to… (More)

- Carlos I Mendoza, I Santamaría-Holek
- The Journal of chemical physics
- 2009

We propose a simple and general model accounting for the dependence of the viscosity of a hard sphere suspension at arbitrary volume fractions. The model constitutes a continuum-medium description based on a recursive-differential method where correlations between the spheres are introduced through an effective volume fraction. In contrast to other… (More)

- Erick Sarmiento-Gomez, Iván Santamaría-Holek, Rolando Castillo
- The journal of physical chemistry. B
- 2014

Structural and viscoelastic properties of slightly interconnected polymer networks immersed in a solvent have been studied in two cases: when the polymer network is building up and when the polymer network is shrinking stepwise in a controlled way. To accomplish this goal, the mean square displacement (MSD) of embedded microspheres in the polymer network… (More)

Transmitter exocytosis from the neuronal soma is evoked by brief trains of high frequency electrical activity and continues for several minutes. Here we studied how active vesicle transport towards the plasma membrane contributes to this slow phenomenon in serotonergic leech Retzius neurons, by combining electron microscopy, the kinetics of exocytosis… (More)

- Adam Gadomski, Piotr Bełdowski, +4 authors Zenon Pawlak
- Mathematical biosciences
- 2013

This work presents a conceptual framework as to how a deficit in the synovial-fluid content, exemplified by hyaluronan or any other amphiphilic species, is capable of decisively altering the complex lubrication and wear conditions observed clinically in articular cartilage. The effect is revealed in (non)stationary regimes if the cartilage is subjected to… (More)

- Karo Michaelian, Ivan Santamaría-Holek
- Entropy
- 2015

The dynamic and thermodynamic properties of nanoclusters are studied in two different environments: the canonical and microcanonical ensembles. A comparison is made to thermodynamic properties of the bulk. It is shown that consistent and reproducible results on nanoclusters can only be obtained in the canonical ensemble. Nanoclusters in the microcanonical… (More)

- K Michaelian, I Santamaría-Holek, A Pérez-Madrid
- Physical review letters
- 2009

- I Santamaría-Holek, J M Rubi
- The Journal of chemical physics
- 2006

We propose a model to explain finite-size effects in intracellular microrheology observed in experiments. The constrained dynamics of the particles in the intracellular medium, treated as a viscoelastic medium, is described by means of a diffusion equation in which interactions of the particles with the cytoskeleton are modeled by a harmonic force. The… (More)

- I Santamaría-Holek, D Reguera, J M Rubí
- Physical review. E, Statistical, nonlinear, and…
- 2001

We analyze the diffusion of a Brownian particle in a fluid under stationary flow. By using the scheme of nonequilibrium thermodynamics in phase space, we obtain the Fokker-Planck equation that is compared with others derived from the kinetic theory and projector operator techniques. This equation exhibits violation of the fluctuation-dissipation theorem. By… (More)