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1. Cholesterol Solubilization: Interplay between Phytosterols, Saponins and Lipid Digestion Products. S. Tsibranska-Gyoreva, V. Petkov, V. Katev, D. Krastev, Z. Vinarov, S. Tcholakova, Colloids Surf. A 662 (2023) 131052. doi: 10.1016/j.colsurfa.2023.131052



1. Role of Lysophospholipids on The Interfacial and Liquid Film Properties of Enzymatically Modified Egg Yolk Solutions. D. Gazolu-Rusanova, F. Mustan, Z. Vinarov, S. Tcholakova, N. Denkov, S. Stoyanov, J. W.J. de Folter, Food Hydrocolloids 99 (2020) 105319; doi: 10.1016/j.foodhyd.2019.105319

2. Food Grade Nanoemulsions Preparation by Rotor-Stator Homogenization. D. Gazolu-Rusanova, I. Lesov, S. Tcholakova, N. Denkov, B. Ahtchi, Food Hydrocolloids 102 (2020) 105579; doi: 10.1016/j.foodhyd.2019.105579

3. Role of Interfacial Elasticity for the Rheological Properties of Saponin-stabilized Emulsions. S. Tsibranska, S. Tcholakova, K. Golemanov, N. Denkov, E. Pelan, S. Stoyanov, J. Colloid Interface Sci. 564 (2020) 264; doi: https://doi.org/10.1016/j.jcis.2019.12.108

4. Origin of the extremely high elasticity of bulk emulsions, stabilized by Yucca Schidigera saponins. S. Tsibranska, S. Tcholakova, K. Golemanov, N. Denkov, L. Arnaudov, E. Pelan, S. Stoyanov, Food Chem. 316 (2020) 126365; doi: https://doi.org/10.1016/j.foodchem.2020.126365

5. Development and Valuation of Doxycycline Niosomal Thermoresponsive in situ Gel for Ophthalmic Delivery. V. Gugleva, S. Titeva, N. Ermenlieva, S. Tsibranska, S. Tcholakova, S. Rangelov, D. Momekov International J. Pharmaceutics 591 (2020) 120010. doi: 10.1016/j.ijpharm.2020.120010



1. Rotator Phases in Alkane Systems: In Bulk, Surface Layers and Micro/nano-confinements. D. Cholakova, N. Denkov. Adv. Colloid Interface Sci. 269 (2019) 7–42; doi: 10.1016/j.cis.2019.04.001

2. Multilayer Formation in Self-Shaping Emulsion Droplets. D. Cholakova, N. Denkov, S. Tcholakova, Zh. Valkova, S. Smoukov. Langmuir 35 (2019) 5484–5495; doi: 10.1021/acs.langmuir.8b02771

3. Shape-Shifting Polyhedral Droplets. P. A. Haas, D. Cholakova, N. Denkov, R. E. Goldstein, S. K. Smoukov, Phys. Rev. Research 1 (2019); doi: 10.1103/PhysRevResearch.1.023017

4. Structure of Dense Adsorption Layers of Escin at the Air−Water Interface Studied by Molecular Dynamics Simulations. S. Tsibranska, A. Ivanova, S. Tcholakova, N. Denkov, Langmuir 35 (2019); doi: 10.1021/acs.langmuir.9b02260

5. Surface Phase Transitions in Foams and Emulsions. N. Denkov, S. Tcholakova, D. Cholakova, Curr. Opin. Colloid Interface Sci. 44 (2019) 32–42; doi: 10.1016/j.cocis.2019.09.005



1. Emergence of polygonal shapes in oil droplets and living cells: the potential role of tensegrity in the origin of life. R. Gordon, M. M. Hanczyc, N. D. Denkov, M. A. Tiffany, S. K. Smoukov, in Habitability of the Universe Before Earth, R. Gordon & A. Sharov eds., Academic Press, 2018, pp. 427-490.

2. Saponin Adsorption at the Air−Water Interface Neutron Reflectivity and Surface Tension Study. J. Penfold, R. K. Thomas, I. Tucker, J. T. Petkov, S. D. Stoyanov, N. Denkov, K. Golemanov, S. Tcholakova, and J. R. P. Webster. Langmuir 34 (2018) 9540−9547; doi: 10.1021/acs.langmuir.8b02158



1. Production and Characterization of Stable Foams with Fine Bubbles from Solutions of Hydrophobin HFBII and Its Mixtures with Other Proteins. L.M. Dimitrova, P.V. Petkov, P.A. Kralchevsky, S.D. Stoyanov, E.G. Pelan. Colloids Surf. A, 521 (2017) 92–104; doi: 10.1016/j.colsurfa.2016.06.018

2. Self-Assembly of Escin Molecules at the Air−Water Interface as Studied by Molecular Dynamics. S. Tsibranska, A. Ivanova, S. Tcholakova, N. Denkov. Langmuir 33 (2017) 8330−8341; doi: 10.1021/acs.langmuir.7b01719



1. Surface Properties of Adsorption Layers Formed from Triterpenoid and Steroid Saponins. N. Pagureva, S. Tcholakova, K. Golemanov, N. Denkov, E. Pelan, S. D. Stoyanov. Colloids and Surfaces A: Physicochem. Eng. Aspects 491 (2016) 18–28.

2. Mechanism of Lowering Cholesterol Absorption by Calcium Studied by In Vitro Digestion Model. L. Vinarova, Z. Vinarov, S. Tcholakova, N. D. Denkov, S. Stoyanov, A. Lips. Food & Function 7 (2016) 151–163.

3. Limited Coalescence and Ostwald Ripening in Emulsions Stabilized by Hydrophobin HFBII and Milk Proteins. L.M. Dimitrova, M.P. Boneva, K.D. Danov, P.A. Kralchevsky, E.S. Basheva, K.G. Marinova, J.T. Petkov, S.D. Stoyanov. Colloids Surf. A 509 (2016) 521–538; doi: 10.1016/j.colsurfa.2016.09.066



1. Lowering of Cholesterol Bioaccessibility and Serum Concentrations by Saponins: in Vitro and in Vivo Studies. L. Vinarova, Z. Vinarov, V. Atanasov, I. Pantcheva, S. Tcholakova, N. Denkov, S. Stoyanov. Food & Function 6 (2015) 501–512.

2. Mechanisms of Cholesterol and Saturated Fatty Acid Lowering by Quillaja saponaria Extract, Studied by in vitro Digestion Model. L. Vinarova, Z. Vinarov, B. Damyanova, S. Tcholakova, N. Denkov, S. Stoyanov. Food & Function 6 (2015) 1319–1330.

3. Unit Cell Structure of Water‑filled Monoolein in Inverted Hexagonal Mesophase in the Presence of Incorporated Tricaprylin and Entrapped Lysozyme. V. Kolev, A. Ivanova, G. Madjarova, A. Aserin, N. Garti. Eur. Biophys. J. DOI 10.1007/s00249-015-1080-3.

4. Self-Shaping of Oil Droplets via the Formation of Intermediate Rotator Phases upon Cooling. N. Denkov, S. Tcholakova, I. Lesov, D. Cholakova, S. K. Smoukov. Nature 528 (2015) 392–395.

5. Molecular Dynamics Simulation of the Aggregation Patterns in Aqueous Solutions of Bile Salts at Physiological Conditions. F. Mustan, A. Ivanova, G. Madjarova, S. Tcholakova, N. Denkov, J. Phys. Chem. B 119 (2015) 15631–15643.



1. Remarkably High Surface Visco-Elasticity of Adsorption Layers of Triterpenoid Saponins. K. Golemanov, S. Tcholakova, N. Denkov, E. Pelan, S. D. Stoyanov, Soft Matter, 2013, 9, 5738.

2. Surface Pressure and Elasticity of Hydrophobin HFBII Layers on the Air-Water Interface: Rheology vs. Structure Detected by AFM Imaging. R.D. Stanimirova, T.D. Gurkov, P.A. Kralchevsky, K.T. Balashev, S.D. Stoyanov, E.G. Pelan. Langmuir 29 (2013) 6053-6067.



1. Surface Shear Rheology of Adsorption Layers from the Protein HFBII Hydrophobin: Effect of Added β-Casein. G.M. Radulova, K.Golemanov, K.D. Danov, P.A. Kralchevsky, S.D. Stoyanov, L.N. Arnaudov, T.B.J. Blijdenstein, E.G. Pelan, A.Lips, Langmuir 28 (2012) 4168-4177.

2. Interfacial Layers from the Protein HFBII Hydrophobin: Dynamic Surface Tension, Dilatational Elasticity and Relaxation Times. N.A. Alexandrov, K.G. Marinova, T.D. Gurkov, K.D. Danov, P.A. Kralchevsky, S.D. Stoyanov, T.B.J. Blijdenstein, L.N. Arnaudov, E.G. Pelan, A. Lips, J. Colloid Interface Sci. 376 (2012) 296-306.

3. Effects of Emulsifier Charge and Concentration on Pancreatic Lipolysis. 1. In the Absence of Bile Saltsd. Z. Vinarov, Y. Petkova, S. Tcholakova, N. Denkov, S. Stoyanov, E. Pelan, A Lips, Langmuir 28 (2012) 8127-8139.

4. Effects of Emulsifier Charge and Concentration on Pancreatic Lipolysis: 2. Interplay of Emulsifiers and Biles. Z. Vinarov, S. Tcholakova, B. Damyanova, Y. Atanasov, N. Denkov, S. Stoyanov, E. Pelan, A. Lips, Langmuir 28 (2012) 12140-12150.

5. Surface Shear Rheology of Saponin Adsorption Layers. K. Golemanov, S. Tcholakova, N. Denkov, E. Pelan, S. Stoyanov, Langmuir 28 (2012) 12071-12084.

6. Surface Shear Rheology of Hydrophobin Adsorption Layers: Laws of Viscoelastic Behaviour with Applications to Long-Term Foam Stability. K.D. Danov, G.M. Radulova, P.A. Kralchevsky, K. Golemanov, S.D. Stoyanov, Faraday Discussions. 158 (2012) 195-221.

7. In vitro study of triglyceride lipolysis and phase distribution of the reaction products and cholesterol: effects of calcium and bicarbonate. Z. Vinarov, L. Petrova, S. Tcholakova, N. Denkov, S. Stoyanov, A. Lips, Food & Function 3 (2012) 1206-1220.

8. Role of calcium in the battle against "bad" cholesterol. Z. Vinarov, BBC Knowledge (Bulgaria) (2012) 36 64-69. [in Bulgarian, popular science]



1. Elastic Langmuir Layers and Membranes Subjected to Unidirectional Compression: Wrinkling and Collapse. K. D. Danov, P. A. Kralchevsky, S. D. Stoyanov, Langmuir 26 (2010) 143-155.



1. Chemical Physics of Colloid Systems and Interfaces. P. A. Kralchevsky, K. D. Danov and N. D. Denkov, Chapter 7 in Handbook of Surface and Colloid Chemistry (3rd Updated Edition; K. S. Birdi, Ed.). CRC Press, Boca Raton, FL, 2008.



1. On the Mechanism of Stomatocyte-Echinocyte Transformations of Red Blood Cells: Experiment and Theoretical Model. K. D. Tachev, K. D. Danov, P. A. Kralchevsky, Colloids Surf. B: Biointerfaces 34 (2004) 123-140.



1. Interarm Interaction of DNA Cruciform Forming at a Short Inverted Repeat Sequence. M. Kato, S. Hokabe, S. Itakura, S. Minoshima, Y.L. Lyubchenko, T.D. Gurkov, H. Okawara, K. Nagayama, and N. Shimizuy, Biophys. J. 85 (2003) 402-408.



1. Gentle Film Trapping Technique with Application to Drop Entry Measurements. A. Hadjiiski, S. Tcholakova, I. B. Ivanov, T. D. Gurkov, E. F. Leonard, Langmuir 18 (2002) 127-138.



1. Particles at Fluid Interfaces and Membranes: Attachment of Colloid Particles and Proteins to Interfaces and Formation of Two-Dimensional Arrays. P.A. Kralchevsky, K. Nagayama; Elsevier, Amsterdam, 2001: Book: 14 chapters, 654 pages.

2. Strong Capillary Attraction between Spherical Inclusions in a Multilayered Lipid Membrane. K. D. Danov, B. Pouligny, M. I. Angelova, and P. A. Kralchevsky. Studies in Surface Science and Catalysis, Vol. 132, Elsevier, Amsterdam, 2001; pp. 519-524.

3. Capillary Forces between Colloidal Particles Confined in a Liquid Film: The Finite-Meniscus Problem. K. D. Danov, B. Pouligny and P. A. Kralchevsky, Langmuir 17 (2001) 6599-6609.

4. Mechanics of Lipid Membranes and Interaction between Inclusions. P. A. Kralchevsky and K. Nagayama, Chapter 10 in the book: "Particles at Fluid Interfaces and Membranes" (P. A. Kralchevsky and K. Nagayama, Authors), Elsevier, Amsterdam, 2001; pp. 426-468.

5. Surface Bending Moment and Curvature Elastic Moduli. P. A. Kralchevsky and K. Nagayama, Chapter 3 in the book: "Particles at Fluid Interfaces and Membranes" (P. A. Kralchevsky and K. Nagayama, Authors), Elsevier, Amsterdam, 2001; pp. 105-136.

6. General Curved Interfaces and Biomembrane. P. A. Kralchevsky and K. Nagayama, Chapter 4 in the book: "Particles at Fluid Interfaces and Membranes" (P. A. Kralchevsky and K. Nagayama, Authors), Elsevier, Amsterdam, 2001; pp. 137-182.



1. Capillary Interactions between Particles Bound to Interfaces, Liquid Films and Biomembranes. P.A. Kralchevsky and K. Nagayama, Adv. Colloid Interface Sci. 85 (2000) 145-192.

2. Erythrocyte Attachment to Substrates: Determination of Membrane Tension and Adhesion Energy. K.D. Tachev, J.K. Angarska, K.D. Danov, and P.A. Kralchevsky, Colloids and Surfaces B: Biointerfaces 19 (2000) 61-80.

3. Viscous Drag of a Solid Sphere Straddling a Spherical or Flat Surface. K.D. Danov, R. Dimova, and B. Pouligny, Phys. Fluids 12 (2000) 2711-2722.

4. Mechanical Properties of Lipid Bilayers Containing Modified Lipids. I. Bivas, V. Vitkova, M.D. Mitov, M. Winterhalter, R.G. Alargova, P. Meleard, and P. Bothorel, Chapter 14 in: "Giant Vesicles", P. Walde & P.L. Luisi, Eds., Wiley, New York, 2000; pp. 207-219.



1. Falling Ball Viscosimetry of Giant Vesicle Membranes: Finite-Size Effects. R. Dimova, C. Dietrich, A. Hadjiiski, K. D. Danov, B. Pouligny, Eur. Phys. J. B 12 (1999) 589-598.

2. Motion of a Massive Particle Attached to a Spherical Interface: Statistical Properties of the Particle Path. K. Velikov, K. D. Danov, M. Angelova, C. Dietrich, B. Pouligny, Colloids & Surfaces A 149 (1999) 245-251.



1. Energy of Adhesion of Human T Cells to Adsorption Layers of Monoclonal Antibodies Measured by Film Trapping Technique. I.B. Ivanov, A. Hadjiiski, N.D. Denkov, T.D. Gurkov, P.A. Kralchevsky and S. Koyasu, Biophys. J. 75 (1998) 545-556.

2. Electron Cryomicroscopy of Bacteriorhodopsin Vesicles: Mechanism of Vesicle Formation. N. D. Denkov, H. Yoshimura, T. Kouyama, J. Walz and K. Nagayama, Biophysical Journal 74 (1998) 1409-1420.



1. Lateral Forces Acting between Particles in Liquid Films or Lipid Membranes. P. A. Kralchevsky, Advances in Biophysics 34 (1997) 25-39.

2. Motion of a Massive Microsphere Bound to a Spherical Vesicle. K.P. Velikov, C. Dietrich, A. Hadjiisky, K. Danov, B. Pouligny, Europhys. Let. 40 (1997) 405-410.

3. Controlling Receptor-Ligand Contact to Examine Kinetics of T Cell Activation. S.M. Patrick. H. An, M.B. Harris, I.B. Ivanov, N.S. Braunstein, and E.F. Leonard, Annals of Biomedical Eng. 25 (1997) 1072-1080.



1. Film Trapping Technique: Precise Method for Three-Phase Contact Angle Determination of Solid and Fluid Particles of Micrometer Size. A. Hadjiiski, R. Dimova, N. D. Denkov, I. B. Ivanov, and R. Borwankar, Langmuir 12 (1996) 6665-6675.

2. Formation of Dimers in Lipid Monolayers. T. D. Gurkov, P. A. Kralchevsky, K. Nagayama, Colloid Polym. Sci. 274 (1996) 227-238.

3. Method for Controlled Formation of Vitrified Films for Cryo-Electron Microscopy. N. D. Denkov, H. Yoshimura and K. Nagayama, Ultramicroscopy 65 (1996) 147-158.

4. Nanoparticle Arrays in Freely Suspended Vitrified Films. N. D. Denkov, H. Yoshimura, K. Nagayama, T. Kouyama, Physical Review Letters 76 (1996) 2354-2357.



1. Lateral Capillary Interaction between Particles Protruding from a Spherical Liquid Layer. P. A. Kralchevsky, V. N. Paunov and Kuniaki Nagayama, J. Fluid. Mech. 299 (1995) 105-132.

2. Stresses in Lipid Membranes and Interactions between Inclusions. P. A. Kralchevsky, V. N. Paunov, N. D. Denkov, K. Nagayama, J. Chem. Soc.: Faraday Trans., 91(19) (1995) 3415-3432.

3. Lateral Capillary Forces between colloidal Particles Incorporated in Liquid Films or Lipid Bilayers. P. A. Kralchevsky, C. D. Dushkin, V. N. Paunov, N. D. Denkov, K. Nagayama, Progr. Colloid Polymer Sci. 98 (1995) 12-17.



1. Theory of Curved Interfaces and Membranes: Mechanical and Thermodynamical Approaches. P. A. Kralchevsky, J. C. Eriksson and S. Ljunggren, Adv. Colloid Interface Sci. 48 (1994) 19-59.



1. Red Blood Cell Interaction with a Glass Surface. J.K. Angarska, K.D. Tachev, I.B. Ivanov, P.A. Kralchevsky, E.F. Leonard, in: "Cell and Model Membrane Interactions", S. Okhi, Ed., Plenum Press, New York, 1991; pp. 199-213.



1. Surface Tension and Surface Energy of Curved Interfaces and Membranes. T. D. Gurkov and P. A. Kralchevsky, Colloids and Surfaces 47 (1990) 45-68.

2. Micromechanical Description of Curved Interfaces, Thin Films and Membranes: I. Quasistatics". P. A. Kralchevsky, J. Colloid Interface Sci. 137 (1990) 217-233.

3. Micromechanical Description of Curved Interfaces, Thin Films and Membranes: II. Film Surface Tensions, Disjoining Pressure and Interfacial Stress Balance. P.A. Kralchevsky and I.B. Ivanov, J. Colloid Interface Sci. 137 (1990) 234-252.



1. Liposome-Glass Interaction Influence of the Lipid Bilayer Phase State. B. Tenchov, D. N. Petsev, R. G. Koynova, C. S. Vassilieff, H. W. Meyer, J. Wunderlich, Colloids and Surfaces 39 (1989) 361.



1. Mechanics and Thermodynamics of Curved Thin Liquid Films. I.B. Ivanov and P.A. Kralchevsky, Chapter 2, in "Thin Liquid Films" (I.B. Ivanov, Ed.) M. Dekker, New York, (1988), pp. 49-130.



1. Hydrostatics of spherical thin films. P.A. Kralchevsky, I.B. Ivanov, In: Surfactants in Solutions, Vol. 6 (K. L. Mittal & P. Bothorel, Eds.), Plenum Press, New York, 1987, pp. 1549-1556.

2. The Close Approach of Cells to Surfaces. E.F. Leonard, I. Rahmim, J.K Angarska, Chr.St. Vassilieff and I.B. Ivanov, Ann. NY Acad. Sci. 516 (1987) 502.



1. Influence of Permeability on the Rate of Mutual Approach of Membranes. D. S. Dimitrov, I. B. Ivanov and T. T. Traykov, Journal of Membrane Science 17 (1984) 79-87.