The lubrication effect of three long-chain polymers - mucin, methylcellulose and Ficoll - on ciliary propulsion in tubes is measured by plotting the relative velocities of swimming cilitates as a function of the tube bore diameter. Mucin shows the most unequivocal lubrication, which is found at concentrations between 0% and 9.1% (w/v). This observation, coupled with viscometric measurements whi...

Mice lacking Muc2 had an increased ratio of proliferating to apoptotic epithelial cells, resulting in altered maturation and increased migration of epithelial cells in the intestine. They were also more likely to develop intestinal, colon, and rectal tumors. The mice are the first good model for studying rectal tumors, which are common in humans. Anticancer lubrication new mouse model for the s...

BI-PHASIC BIOMATERIAL AND ARTICULAR CARTILAGE E.Northwood , R.Kowalski and J.Fisher * Institute of Medical and Biological Engineering, University of Leeds, Leeds, UK. +** DePuy CMW, Cornford Rd, Blackpool, England Email: [email protected] INTRODUCTION Natural articular cartilage has a unique biphasic lubrication regime [1]. Internal interstitial fluid pressure [2, 3] leads to low levels of fr...

The heat flow paradox provides evidence that a dynamic weakening mechanism may be important in understanding fault friction and rupture. We present here a specific model for dynamic velocity weakening that uses the mechanics of well-studied industrial bearings to explain fault zone processes. An elevated fluid pressure is generated in a thin film of viscous fluid that is sheared between nearly ...

Residual lubricants retained in the handpiece may be displaced onto the tooth surface. A few studies have examined the effect of contamination from handpiece lubrication oils on enamel and dentin bond strengths, but the results have been equivocal. 1,2 The purpose of this study was to evaluate the effect of dental-handpiece lubricant on dentinal shear bond strength. A lubrication-free handpiece...

HFC134a(CH2 FCF3) is primarily developed as an alt.ernat.ive t.o t.he ozone depleting refrigerant. CFC12(CC12F2). In t.he case of t.he subst.it.ut.ion of refrigerants for home refrigerators, a t.est., which is aimed at. t.he evaluation of t.he influences on t.he material in t.he refrigerant. in cycle, is necessary as well as thermodynamic charact.erist.ic t.est.. The t.est.ing required includes...

Theoretical Analysis on the profile of slider in reciprocating compressor has been presented based on the hydrodynamic lubrication. Theoretical Analysis calculates fluid film pressure, attitude angle, frictional force, and minimum film thickness in normal condition for comparing two different profiles of slider. The calculated results show that the profile of slider plays an important role in t...

During breathing, the pleural surfaces slide against each other continuously without damage. Pleural liquid and lubricating molecules should provide the lubrication of the sliding surfaces, thus protecting the mesothelium from shear-induced abrasion. D’Angelo et al. (Respir. Physiol. Neurobiol. 2004) measured the coefficient of kinetic friction (μ) of rabbit parietal pleura sliding against visc...

In this paper we present a mathematical model for estimate the collapse time of a gas bubble in a vane of a oil gerotor pump. This amount of time cannot be greater of the total time spent by the pump for filling and then emptying out a vane in a single revolution, otherwise there is a loss of lubrication between internal and external gears. We assume that oil is incompressible and viscous, the ...