The pH and NaCl induced swelling response and drug and protein loading of poly(methacrylic acid-co-acrylic acid) microgels (4-10 μm diameter) were measured as a function of cross-link density. The swelling ratio (Q) of the microgels increased linearly from 2 to 12 when the mole fraction of crosslinking monomer decreased from 0.25 to 0.10 (at pH’s > 5.3). In the presence of 5 M NaCl (at pH’s > 5...

We study a recent model of random networks based on the presence of an intrinsic character of the vertices called fitness. The vertex fitnesses are drawn from a given probability distribution density. The edges between pairs of vertices are drawn according to a linking probability function depending on the fitnesses of the two vertices involved. We study here different choices for the probabili...

Background: The present study aimed to analyze the situation of knowledge management among the faculty members in the four components, including creation, linking, organization and storage, and application. Methods: This is a survey research and the results are presented descriptively and analytically. The study tool was a questionnaire of knowledge management with 84 questions (creation of kno...

The effect of cross-linking layer-by-layer (LbL) films consisting of bioreducible poly(2-dimethylaminoethyl methacrylate) (rPDMAEMA) and DNA is examined with regard to rigidity, biodegradability, cell adhesion, and transfection activity using 1,5-diiodopentane (DIP) cross-linker. DIP chemically reacts with the tertiary amines of rPDMAEMA, altering the chemical composition of these LbL films. Th...

The productivity enhancing capability of cities is widely noted. Yet, while urban innovative capacity is often assumed to arise due to the close proximity of diverse elements within cities, little empirical research has attempted to associate population density with urban innovation. Thus, this research investigates how the density of a specific class of workers, the " creative class " , affect...

Linking structure is a new concept characterizing topological semimetals, which indicates the interweaving of gap-closing nodes at Fermi energy ($E_F$) with other below $E_F$. As number linked can be changed only via pair-creation or pair-annihilation, node more stable and robust than ordinary without linking. Here we propose type nodal between line (nodal surface) $E_F$ another in two-dimensio...

Diels-Alder chemistry has been used for the thermoreversible cross-linking of furan-functionalized ethylene/propylene (EPM) and ethylene/vinyl acetate (EVM) rubbers. Both furan-functionalized elastomers were successfully cross-linked with bismaleimide to yield products with a similar cross-link density. NMR relaxometry and SAXS measurements both show that the apolar EPM-g-furan precursor contai...

In eukaryotic cells the actin-cytoskeletal network provides stiffness and the driving force that contributes to changes in cell shape and cell motility, but the elastic behavior of this network is not well understood. In this paper a two dimensional form-finding model is proposed to investigate the elasticity of the actin filament network. Utilizing an initially random array of actin filaments ...

Investigations of fluid instability and density-driven convection in soils rocks are motivated by both natural phenomena giving rise to ecological problems, human activities. Knowledge about the admixture transportation underground flows driven gravity force is relevant, for example, succeed preventing degradation soil quality or improve efficiency carbon capture sequestration technologies. We ...

proteases are important enzymes that their role in various industries is undeniable. however, keeping enzymes stable during its activity in harsh conditions is so important. in this study, protease enzyme was immobilized on the porous silica particles and its stability in different temperatures and phs was evaluated. first silica particles were aminated by 3-aminopropyltriethoxysilane then the ...