Fractals in Chemistry, Geochemistry, and Biophysics

Birdi, K. S.

doi:10.1007/978-1-4899-1124-7

Cited by 34 publications

(7 citation statements)

References 111 publications

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“…In the case of polycations, it is generally accepted that electrostatic interactions between positive charges on the cationic macromolecule, and negatively charged sites on the cells, which are recognized as a universal characteristic of the cell membrane, induces cell membrane damage and leads to cell death. [51][52][53] Nevertheless, according to Choksakulnitmir, 28 the different degree of cytotoxicity induced by polycations may be due to the balancing contributions of different factors, ranging from difference in the density of positive charges, molecular size and structure could be invoked to explain the experimental results. Under this perspective, the detailed molecular modeling procedure adopted in this work, based on our previous experience on this specific subject, 36,38,49,54 allowed us to formulate, for the first time, a SAR between the in vitro data and some peculiar molecular features of dendrimers, such as radius of gyration, density, shape, and fractal dimension.…”

Section: Discussionmentioning

confidence: 99%

Polyamidoamine (Yet Not PAMAM) Dendrimers as Bioinspired Materials for Drug Delivery: Structure−Activity Relationships by Molecular Simulations

et al. 2004

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In this paper, we report the results obtained from a comprehensive characterization of newly synthesized dendrimeric molecules in a solvated environment, by computer-aided simulations. The evidences allowed us to formulate some structure-activity relationships (SARs) between the experimentally verified cytotoxicity/noncytotoxicity of these compounds and some molecular features such as, for instance, radius of gyration, molecular shape, and dimensions. In particular, all noncytotoxic dendrimers were characterized by a more dense and globular shape and by a smoother surface pattern, as quantified by their fractal dimension D.

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Section: Discussionmentioning

confidence: 99%

Polyamidoamine (Yet Not PAMAM) Dendrimers as Bioinspired Materials for Drug Delivery: Structure−Activity Relationships by Molecular Simulations

et al. 2004

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“…In many cases there is a gradual transition. Kaye [39] and Birdi [40] also proved the above result in their investigations on carbon-black agglomerates. They decided that the shape of the particles is described by the structural fractal dimension and the surface roughness by the textural fractal dimension.…”

Section: Fractal Geometrymentioning

confidence: 60%

Effect of Comminution on Particle Shape and Surface Roughness and Their Relation to Flotation Process: A Review

Ahmed

2009

JES. Journal of Engineering Sciences

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“…The fractal nature of waves is also well known (Birdi, 1993). The fractal nature of waves is also well known (Birdi, 1993).…”

Section: Calming Of Waves By Spread Monolayersmentioning

confidence: 99%

Self-Assembly Monolayer Structures of Lipids and Macromolecules at Interfaces

Birdi¹

2002

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PREFACEThe information that science can extract from molecules that are essential for the processes of life can lead to better understanding of those processes. In natural selection during evolution (both prebiotic and biotic), physicochemical forces have been featured. A specific class of molecules, the amphiphiles, in aqueous environments exhibit self-assembly properties at liquid and solid interfaces. Such properties when combined with other forces require a special analysis. Of the self-assembly properties of amphiphiles, one is the formation of monomolecular films at both liquid-air and solid-air interfaces. During the last few decades, much has been reported in the literature on the formation of insoluble self-assembly monolayer (SAM) films of lipids and macromolecules (synthetic polymers and biopolymers) on the surface of water or at oil-water interfaces.The phenomenon of monolayer self-assembly has attracted considerable attention as a means of controlling molecular structures at interfaces. Studies of monomolecular films have been found to provide much physicochemical information on a molecular scale, which is useful for understanding many industrial and biological phenomena. For instance, the information obtained from lipid monolayer studies has been useful in determining the forces that stabilize various SAM structures found in lipid bilayers, vesicles, biological cell membranes, virus-cell fusion, emulsions, foams and films, and other self-assemblies. Current texts generally devote a single chapter to the characteristics of spread monolayers on liquids, and a researcher may have to look up a few hundred references to determine the procedures needed to investigate or analyze a particular phenomenon. Furthermore, there is an urgent need at this time for a text that discusses the state of the art regarding the surface phenomena exhibited by lipids and biopolymers, as they are relevant to a wide variety of surface and interfacial processes. During the last decade, the study of SAMs on solid surfaces has been aided greatly by developments in scanning tunneling microscopy (STM) and atomic force microscopy (AFM).The purpose of this book is to bring the reader up to date with the most recent experimental and the theoretical developments in relation to SAMs at liquid and solid surfaces. It is my intention to lead the researcher through the vast literature in such a way that he or she will be able to pursue particular investigation with suitable guidance. Such investigations may be industrial (emulsions, foams, dispersions, enhanced oil recovery, nonlinear optics) or biological [lipid-phase transitions, vesicles (drug targeting); bilayers, membranes, ion transport through membranes, sensors] in nature. The treatment in different parts of the text is based on the fundamental concepts of classical thermodynamics of surfaces (interfaces), i.e., the Gibbs adsorption theory. A large amount of experimental data from the literature has been included and critically examined from a vii viii PREFACE theoretical viewpoint...

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Fractals in Chemistry, Geochemistry, and Biophysics

Cited by 34 publications

References 111 publications

Polyamidoamine (Yet Not PAMAM) Dendrimers as Bioinspired Materials for Drug Delivery: Structure−Activity Relationships by Molecular Simulations

Polyamidoamine (Yet Not PAMAM) Dendrimers as Bioinspired Materials for Drug Delivery: Structure−Activity Relationships by Molecular Simulations

Effect of Comminution on Particle Shape and Surface Roughness and Their Relation to Flotation Process: A Review

Self-Assembly Monolayer Structures of Lipids and Macromolecules at Interfaces

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