The studies of Szent-Gyorgyi (1) have clearly established the formation of actomyosin from F-actin and myosin A. SzentGyorgyi (l), Portzehl, Schramm, and Weber (2), Jaisle (3), Snellman and Gelotte (4), and Spicer and Gergely (5) have suggested from their viscometric and centrifugal studies that the maximal amount of myosin A which can be bound by F-actin is in the ratio of 2 to 4 : 1, by weigh...

The conformational and dynamical behaviour of viscoelastic polymer melts and solutions close to solid boundaries is of great interest for the polymer processing industry. In particular, when the gap approaches microscopic scales, boundary effects such as wall-slip [1], cohesive [2] and adhesive failure [3] occur on the same scale as the overall deformation of the bulk sample and their impact on...

We investigate the use of two distinct and complementary approaches to measuring the viscometric properties of low viscosity complex fluids at high shear rates up to 80,000 s−1. Firstly we adapt commercial controlled-stress and controlled-rate rheometers to access elevated shear rates by using parallel plate fixtures with very small gap settings (down to 30 μm). The resulting apparent viscositi...

PURPOSE The study on the interaction between small molecules and DNA has been very useful for investigating the structure and physical properties of DNA, elucidating the damage mechanism of DNA and significant in the design of new drugs targeted to DNA. This article describes an interaction of native calf thymus DNA (ctDNA) with a new 3, 4-dihydropyrano[c]chromene derivative, 2-amino-4-(4- chlo...

This chapter reviews recent studies on blends of conventional cellulose esters (CEs), such as cellulose acetate (CA), cellulose propionate (CP), and cellulose butyrate (CB), with non-crystalline vinyl (co)polymers mainly comprising the N-vinyl pyrrolidone (VP) unit. The mixing behavior of the CE/VP-containing copolymer blends is seriously affected by the chain length (i.e., carbon number) and d...

A well-defined poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA-b-C60) was synthesized using the atom transfer radical polymerization (ATRP) technique and betainized with 1,3-sulfobetaine to yield a Bet-PDMAEMA-b-C60. The solution properties were then studied by light transmittance, viscometric, 1H NMR laser light scattering, and transmission electron macroscopic techniques. It was found that...

A novel tetranuclear [Pt4(Am4M)4]·16.25H2O (1), where H2Am4M is the thiosemicarbazone ligand (Z)-2-(amino(pyridin-2-yl)methylene)-N-methylhydrazinecarbothioamide, has been synthesized and characterized by using various physico-chemical techniques. X-ray analysis revealed that the Pt(II) complex consists of a neutral tetranuclear [Pt4(Am4M)4] unit and abundant water molecules. The tetranuclear u...

Although the development of rheological software has kept pace with the advances in modern rheometrical instruments the process of data analysis and interpretation remains fallible and can be prone to some signiicant errors. The reason for this is that the ability and knowledge of human beings to utilise the intruments and data at their disposal can be somewhat limited in some instances. To sol...

The ultrasonic velocity, density and viscosity of two egg proteins, ovalbumin and ovotransferrin in phosphate buffer have been studied at the physiological pH values. The thermodynamic functions for unfolding, ellipticity, surface amino acid residues and compressibility have been obtained for thermal and chemical denaturation in these food proteins. The computed values of Huggin's constant and ...

The rates of polymerization and depolymerization of identical concentrated deoxygenated hemoglobin S (HbS) solutions following a rapid temperature change were examined by several methods. Two of these methods measured viscosity changes in either gently agitated (AGT) or nonagitated (NAGT) samples. The third method utilized a change in turbidity at 735 nm (SDT). By all three methods, a delay per...