The development of 2 laboratory technics for more accurate quantification of hematopoietic activity, (a) radioactive iron (SgFe) uptake and (b) DNA content of marrow cells, are described, utilizing a regenerating marrow system in rabbits after local irradiation of 1 femur while shielding the contralateral leg. The sensitivity and reproducibility of the 2 methods were determined; there was good ...

Studies on precipitation and turbidimetric methods for fibrinogen determination employing Na2SO3, Na2SO4, (NH4) 2S04 and a mixture of phosphate salts are presented. Optimal reaction conditions for these technics have been verified. The amounts of plasma fibrinogen precipitated by the sulfite and phosphate methods are in closer agreement than either are with values obtained by the (NH4)2S04 and ...

A prospective, open-label, randomized study was conducted in order to determine the bacteriologic efficacies of cefaclor and azithromycin in acute otitis media (AOM). Tympanocentesis was performed on entry into the study and 3 to 4 days after initiation of treatment. Bacteriologic failure after 3 to 4 days of treatment with both drugs occurred in a high proportion of culture-positive patients, ...

To reduce the effects of extraneous potentials caused by muscle tremor, sweating, and interference from power circuits, it is desirable to restrict the frequency range of the cathode ray vectorcardiograph. Mathematical analysis of idealized waves and experiments with a photoelectric electrocardiographic generator indicate that a frequency range between the half-power frequency of 0.8 to 80 cycl...

HE STUDY OF CATALASE ACTIVITY has been the subject of much investigation and has necessitated the use of very elegant technics. Recently, methods have been introduced which simplified the technics for estimating catalase activity. Among these are the iodimetric titration procedure of Dille and Watkins (1), the use of sodium perborate as a source of hydrogen peroxide (2), and various methods uti...