Differential renal function studies during mannitol diuresis in hypertension

Differential renal function studies during mannitol diuresis were performed in patients with essential hypertension and hypertension secondary to main renal artery stenosis. Brisk urine flow rates with reproducible flow ratios between the two kidneys were obtained in most studies. Functional differences of more than 15% between the kidneys were demonstrated in 56% of the patients with essential hypertension. Nevertheless, the mean differences for urine flow, osmolality, osmolal clearance, total solute excretion, creatinine and sodium concentrations in urine, sodium and potassium excretion rates, and tubular rejection fraction of sodium were significantly less than those seen in renal artery hypertension. All the latter patients showed excessive water and sodium reabsorption by the ischemic kidney and were sharply differentiated from patients with essential hypertension.

[Aortorenography: demonstration of a renal artery stenosis]

Vonka, Vladimir (Baylor University College of Medicine, Houston, Tex.), and Matilda Benyesh-Melnick. Interactions of human cytomegalovirus with human fibroblasts. J. Bacteriol. 91:213–220. 1966.—Virus attachment of human cytomegalovirus to human embryo lung fibroblasts was found to be temperature-independent, from 4 to 37 C. Prolonged incubation at 4 C, however, resulted in inactivation of a high proportion of attached virus. Virus penetration seemed to be temperature-dependent, occurring at 37 C but not at 4 C. Detailed studies of the growth curve of the virus were made. Cell-associated virus preceded the appearance of virus in the fluid phase by 2 to 5 days. Complement-fixing antigen could be detected, but only when the cytopathic effect was advanced, and it was demonstrable only in the cell-associated fraction. Under methyl cellulose, decreasing the bicarbonate concentration in the overlay from 0.225 to 0.15% resulted in marked increase in plating efficiency with all strains tested. However, varying the concentration of bicarbonate from 0.3 to 0.15% in fluid medium did not influence the growth of virus.