ACTIVITIES OF THE GROUP OF ELECTRO-OPTICS
The investigations
of the "Electro-optic Group" are directed to characterization
of the structure and the dynamics of colloid dispersions. The
main scientific topics are as follows:
Surface
dipolar (permanent and induced) electric properties of suspended
inorganic, oganic and bilogical nanosupramolecular structures,
which in many cases are more essential for the understanding
their behavior in electric fields than the volume (e. g. dielectric)
electric properties. Several methods are used: light scattering,
electrophoresis, potentiometric titration, conductivity measurements
and nonconventional instruments for electric light scattering
and other electro-optic methods
Non-conventional
intermolecular and interparticle interactions related to the
above interfacial electric properties . Colloid stability and
the processes of particle aggregation. Assembly of polymers,
biopolymers and their complexes. The correlation of colloid
systems stability to nanoparticle surface electric properties
(including their heterogeneity and dynamics) and particularly
to the sensitive optic, electric and electro-optic parameters
present a convenient method for the study of aggregation kinetics
and mechanism and of the properties of the aggregates.Polyelectrolite
clustering. Loose and condensed clusters.
Phase
transitions and variation in the viscoelastic properties of
the disperse systems. The sensitivity of the electro-optic methods
to electro-acoustic effect helps the analysis of the dynamic
modes in colloidal systems.
Adsorption
of ions, surfactants and polymers on nanoparticles. The changes
in surface charge distribution and density upon adsorption of
ions and molecules on the particle surface allows the study
of the adsorption process by means of electro-optics. The particular
sensitivity of electric light scattering to particle dimensions
helps the investigation of the kinetics of polymer adsorption
on rigid surfaces. Conformation of polymers on nanoparticles
and origin of life.
Nanoparticle
average size (from 5 to 1000 nm, in some cases up to 5000 nm)
determination by the relaxation of the electro-optic response.
Nanoparticles of smaller size are studied after their electrosorption
on big anisodiametric or isometric model particles. Several
methods are used for evaluation of polydispersity. Investigations
are accompanied by electron microscopic measurements.
Investigations
of applied significance. Considerable efforts of the group are
directed to the creation of methods which can be used for on-line
control and certification of some environmental and industrial
products (suspensions, gels, liquid crystals, products of cosmetics
and food industry, ceramics, etc.) and in nanotechnology. Creation
of new methods of electrical treatment of water (electrocoagulation
and electroseparation ). Creation of new materials of specially
designed composite and/or hybrid nanoparticles. Tuning of nanoparticle
composition and asymmetry as well as the order-disorder balance.
Particular advantages for biology (biomacromolecular clustering
e.g. virus assembly, mechanism of the effect of elctromagnetic
radiation on biosystems-mobile communications safety, etc.),
biotechnology (e. g. active \intelligent\ separation media for
biopolymers, prevention of inclusion bodies formation, electropermeation
and electroporation of vesicles, cancer electrotherapy, physical
bases of biocompatibility, etc.), medicine (e.g. gene transfer
vehicles for gene therapy, protein aggregation related pathologies,
understanding the physical bases of electric and other physical
therapies, some physiological processes, action of medications
and formulations, including small (chormetic) doses, etc.),
pharmacy (physical bases of synergetics of medications (polytherapies),
preparation of new and better formulations, etc.), enviromental
toxicology (physical bases of toxicity, including that of small
doses of toxic substances, hormetic dose-response curves, etc.)
are presented by the optic and electro-optic investigations
on biopolymers, membranes, viruses, bacteria, etc., behavior
of biopolymers in inhomogenious electric fields, including these
in production and application of biochips, nanomixers, nanoparticles,
etc.
Graduate
courses. Postgraduate doctoral and post-doctoral specialization
on different aspects of colloid and interfacial science and
its application to environmental, industrial and biomedical
problems.
STAFF
Permanent staff
Prof.
S. Stoylov (Head of Group), Corr. member
Assoc. prof. I. Petkanchin
Assoc. prof. M. Stoimenova
Assoc. prof. Ts. Radeva
Assoc. prof. A. Zhivkov
Mrs. V. Milkova – chemist
Mrs. K.Kamburova-chemist
Mrs.A.Gyurova-Chausheva,
PhD student
Mrs. N.Nikolova, techn.assistant
|
Temporary staff
Dr. K. Starchev – free-lance researcher, Swirzerland - assoc. member IPC
Dr. V. Peikov – Abraxis Bioscience, Inc., USA -
assoc. member IPC
Dr. G. Bila – Ukr. Acad. Sci., Kiev
Dr. M. Buleva – Assoc.collaborator
|
FOR CONTACTS
ORGANIZED CONFERENCES
VI-th International
Symposium on Colloid and Molecular Electro-optics-Electropto
'91-Varna , Bulgaria, 19-25 September 1991, Varna, Bulgaria.
IX-th International
Symposium on Colloid and Molecular Electro-optics-Electropto
2000, 7-12 October 2000, Pamporovo, Bulgaria.
PROJECTS
Project
ERBICIPECT 926080 "Biophysical Mechanisms of the Effect
of Electromagnetic Fields on Biological Cells", with COST
244, Sponsored by European Union (EU): 1993-1995
Project
CIPA-CT923013 "Physical Properties and Interparticle Interactions
of Aqueous Oxide Colloids": 1993-1997
Project
BIOMED 1.3.3/ GENE-CT 930024 "Study of the Mechanism of
Orientation of DNA During Biased Sinusoidal Field Gel Electrophoresis"
- Sponsored by EU: 1995-1997
Project
with the A. N. Frumkin Institute of Electrochemistry, Russian
Academy of Sciences, Moscow "The influence of nonadsorbing
polymers on the electric and electrokinetic properties of colloid
particles and lipid membranes"
Project
X-514 with the fund "Scientific Studies": "Electric
Surface Properties and Stability of Colloid Dispersions in Presence
of Charged and Uncharged Polymers": 1995-1998
Project
X-44 with the fund "Scientific Studies": “Electric
Surface Properties, Interactions and Stability of Disperse Systems”:
1991-1994
Project
X-50 with the fund "Scientific Studies": "Influence
of Interface and Interparticle Interactions on the Reological
Behavior of Disperse Systems": 1991-1994
Project
X-451 with the fund "Scientific Studies": "Electro-optic
Parameters of colloidal Phase Transitions": 1994-1997
Project
X-133 with the fund "Scientific Studies": "Mechanisms
of Coagulation-flotation Elimination of Heavy Ions Metals":
1992-1995
Project
X-201 with the fund "Scientific Studies": Membrane
Filtration of Colloid and Cell Suspensions": 1993-1996
Project
X-202 with the fund "Scientific Studies": Fluctuation
Viscoelastic Structures on Liquid Surfaces": 1993-1996
Project
MY-HM-5 with the fund "Scientific Studies-Young Scientists":
"Investigation of the Processes of Aggregation in Disperse
Systems"- 1993
Project
VРП-Х-3/99 with the fund "Scientific
Studies": “Colloid-chemical Problems, Related with
Water Quality”, 1999-2000
Project
CLG NATO: "Interaction of DNA with Agarose Fibres in Gels
and in Solutions" 2002-2004.
Project
X-1212 with the fund “Polyelectrolyte Multilayers on
Colloidal Particles: Structure and Electrical Properties”:
2002-2005.
Project
NATO (SfP 981037) "A Novel and Rapid Detection of Civil
and Warfare Biological Agents", Planning Grent: 2004-2005
Project
NATO "Protective Films and Multilayers for Foods based
on Biodegradable polymers" - 2005-2008, submitted.
Project
"Mechanism of Aggregation and Structure of the Aggregates
in Inorganic Particles/Polysacharides Mixtures", JRP/SNF,
2005-2008, submitted.
COLLABORATIONS WITH ACADEMIC ORGANIZATIONS
Dept.
Phys. Biophys, Med. Fac. - Sofia, (Assoc. Prof. M. Marinov)
Institute
of Biophysics, BAS - Sofia, (Assoc. Prof. S.Taneva, Y.Tsoneva))
Higher
Institute for Food and Flavor - Plovdiv, (Assoc. Prof. N. Raev,
Assoc.Prof. P.Mollov))
Institute
of Polymers, BAS - Sofia, (Prof. Kh. Tsvetanov, Prof. I. Rashkov)
Lab. Bioelectrochemistry,
Frumkin Institute of Physical Chemistry and Electrochemistry,
RAS, Moscow (Prof. Yu. Ermakov)
ICS, CNRS
- Strasbourg, (Assoc. Prof. E. Pefferkorn)
Lab. Biophys.,
Pharm. Fac. - Strasbourg, (Prof. Y. Mely)
Center
for Particle and Colloid Engineering, University of Leeds -
Leeds, (Prof. R. Williams)
Department
of Applied Chemistry, Gifu University - Gifu, (Prof. Tsuneo
Okubo)
Hiroshima
University - Hiroshima, (Prof. K. Yamaoka)
Laboratoire
de Microscopie Moleculaire et Cellulaire, CNRS UMR 8532, Institute
Gustave Roussy, F-94805 Villejuif Cedex, France, (Assoc. Prof.
E. Delain)
IPC - I,
University Bayreuth- Bayreuth, (Prof. H. Hoffmann)
Fac. Chem.,
Uni. Bielefeld - Bielefeld, (Prof. E. Neumann)
MP Inst.
Biophyschem. - Gottingen, (Dr. D. Porschke)
Department
of Biochemistry, University of Iowa (Professor Nancy Stellwagen).
COLLABORATIONS WITH INDUSTRIAL USERS
Aeration
Systems Ltd., Sofia -Sledges in water treatment works, (Prof.
I. Papazov)
Advanced
Technologies Ltd, Institute of Solid State Physics, (Dr. G.
Ivanov)
SELECTED PUBLICATIONS AFTER 1990
BOOKS
S. Stoylov,
"Colloid electro-optics", Academic Press, London,
pp.273, (1991)
B. R.
Jennings, S. P. Stoylov, Eds., "Colloid and Molecular Electro-Optics
1991", Inst. Phys. Publishing, Bristol ,pp. 264 (1992)
I. Petkanchin,
Ed., Special Issue in Honour of N.A.Tolstoy, Colloids and Surfaces
A, 148 (1-2), pp 1-187, (1999)
Ts. Radeva,
Ed., "Physical Chemistry of Polyelectrolytes", Surfactant
Science Series V. 99, Marcel Dekker, New York, pp. 882 (2001)
I. Petkanchin,
Ed., Ninth International Symposium Colloidal and Molecular Electrooptics,
Colloids and Surfaces A, 209 (2-3), pp 105-332, (2002)
S.Stoylov
and M.Stoimenova(Eds.), Molecular and Colloidal Electro-optics,
Taylor&Francis, Boca Raton, London, New York, (2006).
PUBLICATIONS
Ts.Radeva,
K.Kamburova, "Polypeptide multilayer films on colloidal
particles: an in situ electro-optical study", J. Colloid
Interface Sci., 308, 309-317 (2007).
V.Milkova, Ts.Radeva, "Effect of chain length and charge
density on the construction of polyelectrolyte multilayers on
colloidal particles", J. Colloid Interface Sci., 308, 300-398
(2007).
K.Kamburova, Ts.Radeva, "Electro-optics of colloid-polyelectrolyte
complexes: Counterion condensation on free and adsorbed sodium
carboxymethylcellulose", J.Colloid Interface Sci., available
online
A.M. Zhivkov. "Change of purple membranes geometry induced
by protein adsorption". Colloids and Surfaces B: Biointerfaces,
56, 170-173 (2007).
A.M. Zhivkov. "Dependence of depletion layer thickness
on polymer concentration Determined by Vincent's pragmatic and
Donath's electrophoretic theories", J. Colloid and Interface
Science, (2007).
S. Stoylov, "Polar nanoparticles", Chapter 1 In: Molecular
and Colloidal Electro optics, Stoylov and Stoimenova Eds., Taylor&Francis,
Boca Raton, London, New York, p. 17 (2006)
M. Buleva, S. Stoylov, "Electro-optics of composite nanoparticles",
Chapter 18 In: Molecular and Colloidal Electro-optics, Stoylov
and Stoimenova Eds, Taylor&Francis, Boca Raton, London,
New York, p. 425 (2006)
S. Stoylov,"Light Scattering and Electric Light Scattering
from Bacterial Suspensions", Encyclopedia of Surface and
Colloid Science, 2nd Revised Edition, Marcel Dekker, New York,
pp. 3319-3325 (2006).
I.B.Petkanchin, "Counterions dynamics as studied by electro-optics",
In "Recent advances in the electro-optics of collods, polyelectrolytes",
S.PStoylov and M.Stoimenova (Eds.), CRC, Taylor & Francis,
Boca Raton, London, New York, pp.251-264 (2006).
P.Mollov,
K. Mihalev, M. Buleva I. Petkanchin, "Cloud Stability of
apple juices in Relation to their particle charge properties
studied by electro-optics", Food Research International,
39, 519-524 (2006).
V.Peikov, R.Sasai, M.Tanigawa, I.Petkanchin, K.Yamaoka, "Electro-optics
of ß-
FeOOH-particles in aqueous media 2. Field-strenght dependence
of decay and steady-state birefringence, and hydrodynamic and
electrooptic properties" J.Coll.Int.Sci., 295, 445-456
(2006).
Ts.Radeva, K.Kamburova, "Electro-optics of colloid-polyelectrolyte
complexes:
Counterion release from adsorbed macromolecules", J. Colloid
Interface Sci., 293 290-295 (2006).
Ts.Radeva,
"Structure and electrical properties of polyelectrolyte
multilayers on Colloidal particles" In: Molecular and Colloidal
Electro-optics, Stoylov and Stoimenova Eds.,Taylor&Francis,
Boca Raton, London, New York, p. 401 (2006).
Ts.Radeva, K.Kamburova, I.Petkanchin, "Formation of polyelectrolyte
multilayers from polysaccharides at low ionic strength",
J. Colloid Interface Sci. , 298 59-65. (2006).
V.Milkova, Ts.Radeva, "Counterion release from adsorbed
highly charged polyelectrolyte - an electro-optical study",
J. Colloid Interface Sci. 298 (2006) 550-555M.Stoimenova .,
S.Miteva, "Steady Electro-Optic Parameters in Noninteracting
Colloidal Systems", J.Colloid Interface Sci., 300 (2),
577-583 (2006).
M.Stoimenova, "Application of the Scaling Method in Colloidal
Electro-optics", in
"Colloidal and Molecular Electro-optics", Eds.Stoylov
and Stoimenova, International Surfactant Series, CRC Press,
New York 2006.
M.Stoimenova, "Scaling Procedures in the Lowfrequency Electro-optic
Analysis of Charged Colloids ", Colloids and Surfaces B,
Special Issue Elopto 2006, accepted
A.M.Zhivkov. Geometry of purple membranes in aqueous medium,
in: Molecular and Colloidal Electro-Optics, S.P. Stoylov, M.V.
Stoimenova (Eds.), Taylor & Francis, New York, Chapter 14
p.327-365 (2006).
E.Apostolova, S.Krumova, Tz.Markova, Tz. Filipova, M.T.Molina,
I.Petkanchin,
S.G.Taneva, "Role of LHCII organization in the interaction
of substituted 1,4-anthraquinones with thylakoid membranes",
Journal of Photochemistry and Photobiology B, 78, 115-123, (2005).
Ts.Radeva, M.Grozeva, "In situ determination of thickness
and electrical properties of multilayers from weak polyelectrolytes",
J. Colloid Interface Sci., 287, 415. (2005).
G. Bila, M. Buleva, I. Petkanchin, S. P. Stoylov, O. L. Alekseev,
Utilization of Physicochemical Methods of Investigation for
the Quantitative and Qualitative Investigation of Nanocomposite
Systems SiO2+-FeOOH, Nanosystems,, Nanomaterials, Nanotechnologies,
2(4), 1-7 (2004)
Ts. Radeva,
V. Milkova, I. Petkanchin, “Dynamics of counterions in
polyelectrolyte multilayers studied by electro-optics”,
Colloids and Surfaces A, 240, 27-34, (2004).
Ts. Radeva,
V. Milkova, I. Petkanchin, “Electrical properties of
multilayers from low- and high-molecular-weight polyelectrolytes”,
J. Colloid Interface Sci., 279, 351-356, (2004).
Miteva
S., Stoimenova M., “Electro-optic Characteristics of
Aqueous -FeOOH Particles”, J.Coll.Int.Sci., 273,
490-496 (2004).
Miteva S., Stoimenova M., “Electro-optic Characteristics of Optically Interacting Particles”, J.Coll.Int.Sci., 274, 531-537 (2004).
Ts. Radeva,
V. Milkova, I. Petkanchin, “Electro-optics of colloids
coated with multilayers from strong polyelectrolytes:surface
charge relaxation”, J. Colloid Interface Sci., 266, 141-147,
(2003).
Ts. Radeva,
“Adsorption of polymers , at colloid surfaces”,
In: “Encyclopedia of Surface -and Colloid Science”,
Ed. A. Hubbard, Marcel Dekker, New York, p.547– 557, (2002).
M. Stoimenova,
“Electro-Optic Behavior of Colloids”, in “Encyclopedia
of Surface and Colloid Science”, Ed. Hubbard A., Marcel
Dekker, New York, p. 2021-2031, (2002).
A. M. Zhivkov.
pH-dependence of electric light scattering by water suspension
of purple membranes. Colloids and Surfaces A, 209, 319-325 (2002).
A. M. Zhivkov.
Orientation-deformational electro-optical effect in water suspension
of purple membranes. Colloids and Surfaces A, 209, 327-332 (2002).
A. Zhivkov,
S. P. Stoylov, “Electro-optical Characterization of Aqueous
Laponite Suspensions”, Colloids and Surface, 209, 315-318
(2002).
A. Zhivkov,
B. M. I. van der Zande and S. P. Stoylov, “Electro-optics
of Gold Particles: Electric Birefringence of Gold Rods”,
Colloids and Surfaces, 209, 299-304 (2002).
S. Jovtchev,
I. Dzhenev, H. Bäumler, S. Stoeff, M. Marinov and S. Stoylov,
“Factors determining the electro-optical behavior of
red blood cells”, Colloids and Surface, 209, 257-266
(2002).
V. Dimitrov,
M Stoimenova, I. Tsoneva, “Electrically Induced Concentration
Fluctuations in Escherichia coli Suspensions”, Colloids
and Surfaces, 209, 201-205 (2002).
S. Miteva,
M. Stoimenova, “Anisotropy and Acoustic Modes in -FeOOH
Suspensions”, Colloids and Surfaces 209, 207-212, (2002).
Ts. Radeva,
"Electric Light Scattering of Colloid Particles in Polyelectrolyte
Solutions", in "Physical Chemistry of Polyelectrolytes",
Ed. Ts. Radeva, Surfactant Science Series V. 99, Marcel Dekker,
New York, pp 305-346, (2001)
R. Todorov,
K. Starchev, S. P. Stoylov, "Electric light scattering
from single-stranded DNA in linear polyacrylamide solutions",
Electrophoresis, 22, 39, (2001)
M. Buleva,
V. Peikov, E. Pefferkorn, I. Petkanchin, “Adsorption
of Polyacrylic Acid on -Al2O3 colloid particles as studied
by electro-optics”, Coll. and Surf.A, 186, 155-161, (2001)
A. G. Dobrikova,
R. Morgan, A. G. Ivanov, E. Apostolova, I. Petkanchin, N. P.
A. Huner, S. G. Taneva, “Electric properties of thylakoid
membranes from pea mutants with modified carotenoid and chlorophyll-protein
complex composition”, Photosynth.Res, 65, 165-174, (2001)
V. Peikov,
K. Sasai, I. Petkanchin, K. Yamaoka, "Electrooptics of
b-FeOOH particles in aqueous media. 1.Reversing-Pulse Eelectric
Birefringence in the low flied region", J. Coll. Int. Sci.,
230, 410-419, (2000)
S. Jovtchev,
I. Djenev, S. Stoeff, S. Stoylov, "Role of electrical and
mechanical properties of red blood cells for their aggregation",
Colloids and Surfaces A: Physicochemical and Engineering Aspects,
164, 95, (2000)
K. Yamaoka,
V. Peikov, R. Sasai, S. P. Stoylov, "Theory and Experiment
of Reversing-Pulse Electric Birefringence. The Case of Bentonite
Suspensions in the Absence and Presence of Cetylpyridinium Chloride",
Colloids and Surfaces, 148, 43, (1999)
M. Stoimenova,
T. Okubo, "Electro-Optic Spectroscopy of Colloidal Systems",
in "Surfaces of Nanoparticles and Porous Materials",
Eds.Schwartz and Contescu, International Surfactant Series,
Marcel Dekker, New York pp. 103-124 (1999)
M. Buleva,
I. Petkanchin, "Interaction of humic substances with silica
and alumina colloids: adsorption and stability. Electro-optical
study", Colloids and Surfaces A, 151, 225, (1999)
I. Petkanchin,
A. Dimitrova, "Electric surface properties of fractal aggregates
- rotational and translational electrokinetics", Colloids
and Surfaces A, 148, 35, (1999)
Ts. Radeva,
I. Petkanchin, "Electric properties of adsorbed polystyrenesulfonate
I: Dependence on the polyelectrolyte molecular weight",
Journal of Colloid and Interface Science, 220, 112-117, (1999)
S. G. Taneva,
I. B. Petkanchin, "Surface electric properties of biological
systems" Trends in Photochemistry and Photobiology, 6,
113-139, (1999)
M. Stoimenova,
A. Alekov, T. Okubo, "Relation of Electro-Acoustic Effects
to Low Frequency Anomalies in Colloidal Electro-Optics",
Colloids and Surfaces 148, 83-86, (1999)
M. Stoimenova,
T. Okubo, "Electro-Optic Spectroscopy of Colloidal Systems",
in "Surfaces of Nanoparticles and Porous Materials",
Eds.Schwartz and Contescu, International Surfactant Series,
Marcel Dekker, New York pp. 103-124, (1999)
I. V. Zhivkova,
A. M. Zhivkov, D. S. Stoychev, "Electrostatic behaviour
of polyethylene oxide" Europ. Polym. J. 34, 531-538, (1998)
S. P. Stoylov,
C. Vuilleumier, E. Stoylova, H. Drocquigny, B. P. Roques, D.
Gerard, Y. Mely, "Ordered Aggregation of Ribonucleic Acids
by the HIV-1 Nucleocapsid Protein", Biopolymers, 41, 301,
(1997)
Ts. Radeva,
"Electro-optics of colloid-polyelectrolyte suspensions",
Current Topics in Colloid and Interface Science, 2, 131, (1997)
Ts. Radeva,
V. Peikov, S. P. Stoylov, H. Hoffmann, "Electric Light
Scattering from Polytetrafluorethylene Suspensions", Colloids
and Surfaces, 119, 1, (1996)
M. Stoimenova,
V. Dimitrov, T. Okubo, "Electrically Induced Shear Waves
in Colloidal Crystals", J. Coll. Int. Sci., 184, 106-111,
(1996)
M. Stoimenova,
T. Okubo, "Electro-Optic Effects in Colloidal Crystals
of Spherical Silica Particles", J. Coll. Int. Sci., 176,
267-271, (1995)
Ts. Radeva,
I. Petkanchin, R Varoqui, "Electrical and Hydrodynamic
Properties of Colloid-Polymer Surface Layers Investigated by
Electro-optics", Langmuir, 9, 170, (1993)
M. Stoimenova,
M. Buleva, "Electro-Optic Investigation of Oxide Suspensions.
Optic Effects in Semidilute Dispersions.", J. Coll. Int.
Sci., 152 (2), 483-492 (1992).
M. Stoimenova,
A. Zhivkov, "Electro-optic investigation of oxide suspensions:
Surface charge sign reversal through specific adsorption"
J. Coll. Interface Sci. 142, 92-96, (1991)
OTHER PUBLICATIONS
N. Tuparev,
I. B. Petkanchin and S. G. Taneva, “Irreversible temperature-induced
changes in purple membranes, studied by electro-optics”,
J.Coll.Int.Sci., 257(1), 121-126, (2003)
N. Tuparev,
I. B. Petkanchin and S. G. Taneva, “Irreversible temperature-induced
changes in purple membranes, studied by electro-optics”,
J.Coll.Int.Sci., 257(1), 121-126, (2003)
A. M. Zhivkov,
A. I. Yusipovich, Yu. A. Ermakov. Electrophoretic study of depletion
layer thickness of poly(ethylene glycol) in water suspension
of phosphatidylserine liposomes. Compt. rend. Acad. bulg. Sci.,
55 (2002) N8, 51-56.
A. I. Yusipovich,
A. M. Zhivkov. Change in boundary potential of lipid membranes
induced by poly(ethylene glycol). Compt. rend. Acad. bulg. Sci.,
55 (2002) N9, 25-30.
E. Apostolova,
S. Krumova, N. Tuparev, M. T. Molina, Ts. Filipova, I. Petkanchin,
S. G. Taneva, “Interaction of biological memebranes with
substituted 1,4-anthraquinones”, Colloids and Surfaces
B; Biointerfaces, 29, 1-12, (2003)
M. Buleva,
G. Bila, I. Petkanchin, S. P. Stoylov, Suface Electric Properties
of nanosized SiO2 spherical particles adsorbed on -FeOOH
ellipsoids, Nanoscience and Nanotechnology, 3, eds E. Balabanova
and I. Dragieva, Heron Press, Sofia, 2003, p. 184
S. Bernacchi,
S. Stoylov, E. Piémont, D. Ficheux, B. P. Roques, J.
Luc Darlix and Yves Mély,, “HIV-1 Nucleocapsid
Protein Activates Transient Melting of Least Stable Parts of
the Secondary Structure of TAR and its Complementary Sequence”,
J. Molecular Biology, 317, 385-399 (2002).
A. Dobrikova,
I. Petkanchin, S. G. Taneva , “Temperature-induced changes
in the surface electric properties of thylakoids and PS II membrane
fragments”, Coll. & Surf. A, 209,(2-3), 185-191,
(2002)
S.Stoylov,
I.Petkanchin “Surface charge on solid/water interface,
heterogeneity and dynamics: an electrooptic approach”Current
Topics in Colloid and Interface Science, 4, 1-13, (2001)
S. G.
Taneva, F. M. Goñi, N. P. Tuparev, I. Petkanchin, Andras
Der, A. Muga, “Effect of Asp 85 replacement by Thr on
the conformation, surface electricproperties and stability of
bacteriorhodopsin”, Coll.&Surf.A,209(2-3), 193-200,
(2002)
Ts. Radeva, V. Milkova, I. Petkanchin, “Structure of
polyelectrolyte layers on colloidal particles at different ionic
strengths”, Coll. & Surf. A, 209,(2-3), 227-233,
(2002)
M. Buleva,
I. Petkanchin, “Influence of Na-humate on electric surface
properties and stability of -Al2O3 dispersions”,
Coll. & Surf. A, 209,(2-3),289-297, (2002)
Ts. Radeva,
“Overcharging of ellipsoidal particles by oppositely
charged polyelectrolytes”, Colloids Surf. A, 209, 219
– 225 (2002)
S. P.
Stoylov, I. B. Petkanchin, “Surface charge on the solid/water
interface-heterogeneity and dynamics: an electro-optic approach”,
Current Topics in Colloid and Inteface Sci., 4, 1-13 (2001).
S. P.
Stoylov, “Light Scattering and Electric Light Scattering
from Bacteria”, Encyclopedia of Surface and Colloid Science,
Marcel Dekker, New York, 2002, pp. 3018-3022.
G. Bila,
M. Buleva, I. Petkanchin, S. P. Stoylov, “Surface Electric
Properties of 12 nm Nanosized Spherical SiO2 Particles adsorbed
on β-FeOOH Elipsoids “, Comptes rendues de l'Academie
bulgare des Sciences, 54, 65-70 (2001).
Ts.
Radeva,V. Milkova, I. Petkanchin, “Structure and electrical
properties of polyelectrolyte multilayers formed on anisometric
colloidal particles”, J.Coll.Int.Sci.244, 24-30,(2001).
Ch. Vassilieff,
I. Petkanchin, D. Nikova, L. Aleksandrova, “Latex adhesion
to glass in a spiral-shaped flow chamber”,Ann. De l’Univ.
de Sofia, 92/94, 89-96, (2001)
S. P.
Stoylov, E. Stoylova, R. Todorov, P. Schmiedel, C. Thunig, H.
Hoffmann, B. P. Roques, E. Le Cam, D. Coulaud, E. Delain, D.
Gerard, E. Mely, "Aggregation of PolyA-HIV-1 Nucleocapsid
Protein NCp7 Complexes and Properties of the Aggregates",
Colloids and Surfaces, 152, 263, (1999)
V. Dimitrov,
A. Alekov, M. Stoimenova, “Influence of Electro -Acoustic
Effects on t he Electro-Optic Response of Charged Colloids”,
J.Coll.Int.Sci. 220, 224-228 (1999).
E. Le Cam,
D. Coulaud, E. Delain, P. Petitjean, B. P. Roques, D. Gerard,
E. Stoylova, C. Vuilleumier, S. P. Stoylov, Y. Mely, "Properties
and Growth Mechanism of the Ordered Aggregation of a Model RNA
by the HIV-1 Nucleocapsid Protein: An Electron Microscopy Investigation",
Biopolymers, 45, 217, (1998)
V. Peikov, R. Sasai, S. P. Stoylov, K. Yamaoka, “Surface
Electric Properties of the Na-Bentonite/Cetylpyridinium Chloride
System as Studied by Reversing-Pulse Electric Birefringence”,
J. Coll. Interface Sci., 197, 78 (1998).
I. V.
Zhivkova, A. M. Zhivkov, D.S. Stoychev. Electrophoretic mobility
of aluminium oxide par¬ticles in the presence of polyethylene
oxide. Compt. rend. Acad. bulg. Sci., 50 (1997) N6,71-74.
Y. Mely,
S. P. Stoylov, C. Vuilleumier, B. P. Roques, D. Gerard, “Interaction
of HIV-1 Nucleocapsid Protein NCp7 with RNA”, Europ.
Biophys. J., 26, 84 (1997).
I. Petkanchin,
"Electro-optical study of oxide dispersions and their stability",
J. Disp. Sci. and Tehnology, 18, 733-751, (1997).
Dimitrova,
V. Peikov, I. Petkanchin, "Electric Surface Properties
of Model b-FeOOH Particles in the Presence of Different Counterions",
J. Coll. Int. Sci., 185, 548, (1997)
Ts. Radeva,
J. Widmaier and I. B. Petkanchin, "Adsorption of hydrolyzed
polyacrylamides on ferric hydroxides: Counterions mobility in
stabilized suspensions", J.Coll.Int.Sci., 189, 23-26, (1997)
Ts. Radeva, I. Petkanchin, "Electric properties and conformation
of polyethylenimine at the hematite-aqueous solution interface",
J. Coll. Int. Sci., 196, 87-91, (1997)
A. M.
Zhivkov "Changes in purple membrane curvature caused by
lectin adsorption" Compt. rend. Acad. bulg. Sci. 50, N3,
19-22, (1997)
A. M.
Zhivkov, "Changes in purple membrane geometry induced by
high voltage electric field" Compt. rend. Acad. bulg. Sci.
50, N5, 25-28, (1997)
V. Peikov,
Ts. Radeva, S. P. Stoylov, H. Hoffmann, "Electric Light
Scattering of Polytetrafluorethylene Suspensions. I. Influence
of Dialysis", Progress of Colloid. Sci., 100, 64 (1996).
Y. Mely, S.P.Stoylov, C. Vuilleumier, B. P. Roques, D. Gerard,
“Interaction of HIV-1 Nucleocapsid Protein NCp7 with
RNA”, Prog. Biophys. Molec. Biol. 65, 80 (1996).
M. Buleva,
I. Petkanchin, "Influence of Polyelectrolyte Adsorption
on the Electro-Optical Behavior of Aerosil Particles",
Berichte Bunsen Geselschaft Phys. Chem., 100, 972, (1996)
S.
P. Stoylov, E. Stoylova, J. Sturm, G. Weill, "Electric
Birefringence of Polytetrafluorethylene Particles in Agarose
Gels", Biophysical Chemistry, 58, 157, (1996)
S. Kakorin,
S. P. Stoylov, E. Neumann, "Electrooptics of Membrane Electroporation
in Diphenylhexatrien Doped Lipid Bilayer Vesicles", Biophysical
Chemistry, 58, 119, (1996)
S. P. Stoylov, "Electric Polarizability of Polyelectrolyte
and Colloid Media: Dielectric vs. Electro-Optic Approach",
Biophysical Chemistry, 58, 165 (1996)
A. M.
Zhivkov. pH-induced changes in the geometry of the purple membranes.
Compt. rend. Acad. bulg. Sci., 49 (1996) N12, 17-21.
I. Zhivkova,
A. Zhivkov, D. Stoychev. Viscosimetric study of high molecular
weight polyethylene oxide. J. Mater. Sci. Lett., 15 (1996) 2115-2117.
V. Peikov,
S. P. Stoylov, I. B. Petkanchin, B. P. Nikolova, "Electric
Polarizability of Escherihia Coli Studied by Electro-Optics",
J. Coll. Int. Sci., 170, 389, (1995)
V. Peikov,
S. P. Stoylov, I. B. Petkanchin, "Interactions and Dimensions
of fd-virus Particles from Electric Light Scattering",
J. Coll. Int. Sci., 171, 173 (1995)
Ts. Radeva,
S. P. Stoylov, H. Hoffmann, "Electric Light Scattering
by Suspensions of Anisotropic Slightly Anisodiametric Latex
Particles", Colloids and Surfaces, 104, 337, (1995)
I. Petkanchin,
K. Starchev, A. Dimitrova, "Universality in electric light
scattering properties of oxide aggregates in aqueous dispersions",
Colloids and Surfaces, 104, 259, (1995)
M. Stoimenova,
Ts. Radeva, "Electro-optics of Semidilute Dispersions:
Influence of Electrostatic Interactions on Colloid Particle
Relaxation Times", J.Coll.Int.Sci. 169, 329-334 (1995)
G. Todorov,
S. Sokerov, S. Stoylov, "Birefringence of purple membranes",
J. Coll. Int. Sci., 165, 154, (1994)
S. P.
Stoylov, "Relation between stability of oxide and clay
disperse systems and the electric properties of their particles",
Advances in Colloid and Interface Science, 50, 51, (1994)
K. Starchev,
I. Petkanchin, S. P. Stoylov, "Electric Light Scattering
Investigation of Structural Anisotropy and Electrical Polarizability
of Fractal Aggregates", Langmuir, 10, 1456, (1994)
S. Taneva,
M. Busheva, A. Dobrikova, I. Petkanchin, "Electro-optical
investigation of thylakoids and PS II fragments treated with
trypsin", J. Photochem. Photobiol. B: Biol. 23, 19, (1994)
K. Starchev,
V. Peikov, S. P. Stoylov, I. Petkanchin, "Aggregation in
the b-FeOOH-Potassium Oleate System", J. Coll. Int. Sci.,
162, 81, (1994)
I. Petkanchin,
"Adsorption of Neutral Polymers and Polyelectrolytes on
Model Colloid Particles by Electrooptics", Macro-ion Characterization,
ACS Symposium, (Ed. K. S. Schmitz), 436 (1994)
M. Stoimenova,
V. Peikov, "Electro-Optic Investigation of Oxide Suspensions.
Scaling of the Electro-optic Effects by Field Intensity.",
J.Coll.Int.Sci. 164, 285-290 (1994).
V. Peikov,
Ts. Radeva, M. Stoimenova, "Electro-optics of Semidilute
Dispersions: Separation of Electrical and Optical Effects",
J.Coll.Int.Sci. 168, 1-7 (1994).
K. Starchev,
V. Peikov, S. P. Stoylov, I. B. Petkanchin, K. D. Streb, H.
Sonntag, "Kinetics of reaction-limited cluster aggregation
studied by electric light scattering", Colloids and Surfaces
A, 76, 95, (1993)
K. Starchev,
S. P. Stoylov et al. "Structure of Silica Determined by
Use of a Light-Scattering method", Phys. Rev. B., 47, 11725,
(1993)
V. Peikov,
I. Petkanchin, S. Stoylov, "Electro-optical determination
of alfa-FeOOH particle sizes", J. Disp. Sci. Techn., 14,
499, (1993)
Ts. Radeva,
J. Netzel, I. Petkanchin, S. Stoylov, "Electrooptic study
of neutral polymer adsorption on mica", J. Coll. Int. Sci.,
160, 493, (1993)
Ts. Radeva,
M. Stoimenova, "Electro-Optic Study of Colloid Dispersions
Stabilized by Polyelectrolyte Adsorption", J. Coll. Int.
Sci., 160, 475-478, (1993).
K. Starchev,
S. Stoylov, "Determination of Electric Surface Properties
of Fast Precipitating PbO2 Suspensions", Izv. Chem., Bulg.
Acad. Sci., 24, 4, 547, (1992)
S. Stoylov,
E. Neumann, "On the electric dichroism of suspensions of
non-absorbing particles", Izv. Chem., 25, 4, (1992)
S. Taneva,
I. Petkanchin, G. Todorov, S. Stoylov, "Influence of cation
binding on the electro-optically determined electric moments
of purple membranes", Advances in Colloid and Interface
Science, 38, 299, (1992).
M. Stoimenova,
M. Buleva, "Electro-Optic Investigation of Oxide Suspensions.
Optic Effects in Semidilute Dispersions.", J. Coll. Int.
Sci., 152 (2), 483-492 (1992).
M. Stoimenova,
R. Koynova, J. Khristova, B. Tenchov, "Electro-Optic Observation
of the Gell-Liquid Cristalline Phase Transition in Liposomes",
J. Coll. Int. Sci., 151 (2), 591-593 (1992).
I. B.
Petkanchin, S. G. Taneva, S. G. Todorov, "Influence of
surface active substances on the electric surface properties
of purple membrane fragments", Colloids and Surfaces, 52,
257, (1991)
I. B.
Petkanchin, "Electric light scattering method for studying
electric properties of colloid particles and their interaction",
Int. Symp. on Colloid and Molecular Electro-Optics, Varna, IOP
Publ. Ltd, Bristol, (Eds. B. R. Jennings, S. P. Stoylov), p.
147-152, (1991)
Ts. Radeva,
M. Stoimenova, "Electro-optic investigation on polymer
adsorption and its influence on the electric double layer of
colloid particles", Colloids and Surfaces 54, 235-244 (1991).
M. Buleva,
M. Stoimenova, "Electro-Optic Investigation of Oxide Suspensions.
Mechanism of Formation of the Induced Dipole Moment", J.
Coll. Int. Sci. 141 (2), 426-432 (1991).
M. Stoimenova,
Ts. Radeva, "Electro-Optic Investigation of Oxide Suspensions.
On the Nature of "Permanent" Dipole Moment",
J. Coll. Int. Sci. 141 (2), 433-438 (1991).
I. Petkanchin,
K. D. Streb, H. Sonntag, "Slow Coagulation of Aqueous a-Fe2O3
Dispersion Studied by Electric Light Scattering", Colloids
and Surfaces, 50, 189, (1990).
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