Geary

Linear polarisation measurement is based on the Stern-Geary equation . Ai... 

Stern and Geary on the basis of a detailed analysis of the polarisation curves of the anodic and cathodic reactions involved in the corrosion of a metal, and on the assumption that both reactions were charge-transfer controlled (transport overpotential negligible) and that the /R drop involved in determining the potential was negligible, derived the expression... 

Oldham and Mansfeld" approached the problem of linearity in a different way and their derivation avoids the approximation used by Stern and Geary. They conclude that although linearity is frequently achieved this is due to three possible causes (a) ohmic control due to the IR drop rather than control according to linear polarisation, (b) the similarity of the values of b, and be and (c) a predisposition by the experimenter to assume that the AE — Ai curves near must be linear. In a later paper Oldham and Mansfeld" showed that linearity of the AE — Ai curve is not essential and... 

Combining equations 19.8 and 19.10 gives equation 19.3 the Stern Geary equation by simple algebra. However, Oldham and Mansfield point out that further differentiation of equation 19.9 gives... 

Rp data are meaningful for general or uniform corrosion but less so for localized corrosion, including MIC. In addition, the use of the Stem-Geary theory where the corrosion rate is inversely proportional to Rp at potentials close to is valid for conditions controlled by electron transfer, but not for the diffusion-controlled systems frequently found in MC. 

Axcell BC, PJ Geary (1973) The metabolism of benzene by bacteria. Purification and some properties of the ezyme cw-l,2-dihydroxycyclohexa-3,5-diene (nicotinamide adenine dinucleotide) oxidoreductase (ciT-benzene glycol dehydrogenase). Biochem J 136 927-934. 

Crntcher SE, PJ Geary (1979) Properties of the iron-snlphnr proteins of the benzene dioxygenase system from Pseudomonas putida. Biochem J 111 393-400. 

Geary, W.A., II, and Wooten, G.F. Quantitative film autoradiography of opiate agonist and antagonist binding in rat brain. J. Pharmacol Exp Ther 225 234-240, 1983. 

Geary RS, Wall CM, Miller MA, et al. 1994. Partition coefficient measurements of diisopropyl methylphosphonate (DIMP) and trichloroethylene in rats using microdialysis and incorporated in physiologically-based pharmacokinetic (PBPK) modelling [Abstract], Society of Toxicology 33rd Annual Meeting, Dallas, TX 13-17 March, 1994. Paper No. 82. 

Weiss DJ, Geary RS, Wustenberg W, et al. 1994. Comparative metabolism of diisopropyl methylphosphonate in mink and rats. Arch Environ Contain Toxicol 27 420-425. 

Ho NFH, DP Thompson, TG Geary, TJ Raub, CL Barsuhn. (1990). Biophysical transport properties of the cuticle of Ascaris suum. Mol Biochem Parasitol 41 153-166. 

Haemonchus contortus CNS, PNS and ENS Geary etal., unpublished observations... 

Bowman, J.W., Winterrowd, C.A., Friedman, A.R., Thompson, D.P., Klein, R.D., Davis, J.P., Maule, A.G. and Geary, T.G. (1995) Nitric oxide mediates the inhibitory effects of SDPNFLRFamide, a nematode FMRFamide-like neuropeptide, in Ascaris suum. Journal of Neurophysiology 74, 1880-1888. 

Fellowes, R.A., Maule, A.G., Marks, N.J., Geary, T.G., Thompson, D.P., Shaw, C. and Halton, D.W. (1998) Modulation of the motility of the vagina vera of Ascaris suum in vitro by FMRFamide-related peptides. Parasitology 116, 277-287. 

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