Urine was collected from the trout (Salmfi gairdneri) using a cannulation technique. Total urine and electrolyte outputs decreased in smolts as compared with fresh water parr. The filtration rates, as measured using the inulin method, were concomitantly decreased in the smolts. No significant change of urine concentration, percent reabsorption or percent secretion of filtrate was recorded. There was a linear relationship between cumulative output and time indicating a steady flow rate. An increase in sodium and chloride content in the muscle was recorded during smolt transformation. Potassium and water content remained the same as in non-smolts. In the above group, the plasma sodium concentration increased. The decrease in renal output without dilution of body fluids is discussed with respect to a possible change in the extrarenal ion exchange mechanism. / Science, Faculty of / Zoology, Department of / Graduate

The conductivities of the homologous series from tetra-methyl to tetra-n-amyl of the normal tetraalkylammonium iodides and bromides in acetonitrile at 25° C have been determined. The concentrations studied ranged from 0.006 to 0.00003 moles per litre. These salts are fairly strong electrolytes in acetonitrile. The iodides have higher conductivities and are more highly dissociated than the corresponding bromides. The conductivities decrease with increasing size of the alkyl group and the degrees of dissociation show a corresponding increase. There is a relatively large difference between the tetramethyl and tetraethyl ions and then smaller, fairly regular differences in going from tetraethyl to tetra-n-amyl. The limiting equivalent conductivities have been calculated by the methods of Shedlovsky and Fuoss. It is shown that the dissociation constants calculated by the method of Shedlovsky and those calculated by the method of Fuoss are not related in the manner predicted by these authors. Ionic conductances have been calculated by assuming that Walden's rule applies to the tetra-n-butylammonium ion. A comparison of ionic resistances in some organic solvents shows that the quaternary ammonium ions have little tendency to interact with solvent molecules. / Science, Faculty of / Chemistry, Department of / Graduate

Bibliography: pages 103-106. / Beta-alumina solid electrolytes studied were subjected to charge and discharge cycles in a secondary, high energy density Na/beta-alumina/NaAlCl₄/FeCl₂ cell (known as the Zebra cell) at 250⁰ C. These electrolytes were studied by means of optical microscopy, as well as SEM and EDS analyses to est ablish possible failure modes. After cycling little discolouration, or impurity pickup was found to have occurred in the electrolyte. The forms of degradation of the beta-alumina electrolyte identified appeared to be a result of inherent flaws in the beta-alumina electrolyte tube, problems due to protracted storage of the tubes, or an apparent interfacial film on the cathode/electrolyte interface. A lead wetting agent was used in the cells to enhance the wetting of the beta-alumina electrolyte by the liquid Na. A study of the coating after cycling of the cell showed that the coating was adherent irrespective of the number of cycles completed. The coating did not appear to influence cracking of the electrolyte during cycling. Cracking of the beta-alumina electrolyte was found to have initiated from the Na/electrolyte interface. No evidence of crack initiation nor internal damage was found on the cathode/electrolyte interface. The cracks through the beta-alumina electrolyte wall were found to have sealed by the formation of a plug consisting largely of Na and Cl. On the basis of EDS analyses of the fracture surface of the sealed crack possible sealing mechanisms are proposed.

This study was done to examine the effects of supplementing electrolytes to heat stressed transitioning cows on dry matter intake (DMI), milk yield (MY), and blood metabolites. Overall, 104 Holstein and Jersey cows were utilized from August to September, 2012, and from August to November, 2013. Control (CON) cows were fed standard TMR and E+ cows received the same TMR plus 170 g of Bovine BlueLite. The DMI, MY and composition, rectal temperature, and respiration rate were monitored daily; while blood metabolites, body weight, condition score and frame size (withers height, hip height, and heart girth) were measured weekly. The DMI, MY and composition were not different among treatments. Health condition, body change, and blood chemistry were not affected by treatment. Electrolyte supplementation did not have any negative effects on performance of dry and lactating cows, but showed positive potential for alleviation of heat stress in the present study.

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.