(1) In addition, the cell orientation within the shear field varies in a random fashion due to cell-cell interactions when the hct is large as during preshear in the viscometer .(2) The simple viscometer devised for these experiments may also prove useful in other contexts.(3) Rheological properties were measured using a capillary viscometer recording shear stress - shear rate relationship.(4) The steady-shear surface viscosity was measured in a custom built magnetic needle viscometer .(5) The Spectro technicians also use viscometers to test the viscosity of engine oil.(6) Except for the lowest molecular weight samples, all of the average molecular weights were determined by agarose gel electrophoresis or viscometry .(7) Although viscometry is potentially an excellent tool for quality control of liposomes and lipoplexes, it has seldom been used in this field, most likely because it requires a large amount of sample.(8) Our studies of BIA-DNA interactions by isothermal titration calorimetry and viscometry were not successful mainly because of insufficient solubility of the imidazoacridone compounds in water (data not shown).(9) For the estimation of cellulase activity, carboxymethyl cellulose with a degree of substitution of 0.4 was used as a substrate in viscometric assays.(10) In addition, viscometric measurements perturbed assembly by fragmenting filaments.(11) The degree of polymerisation was determined viscometrically , while diffuse reflectance FTIR was used to gain insight into the changes in the chemical composition.(12) The combination of the minicapillary viscometer and the new viscometric measurements is practical in the study of DNA-lipid complexes, and possibly other particles including liposomes and bioactive polymers.(13) A quantitative study to follow the time course of lipoplex maturation will be possible viscometrically using Eqs. 5 and 6.(14) This water-soluble O carboxymethyl ether of pachyman is a useful substrate for assay of beta-D-glucan endo-hydrolases either reductometrically or viscometrically .(15) In some cases intercalative ability has been confirmed with the ethidium displacement assay or viscometry .(16) Ultra-high molecular weight polyethylene has a viscometrically determined average molecular weight of about one million or more and its excellencies in impact strength and wear resistance are well-known in the industry.