T HE method for measuring cardiac output based on the "dye dilution" principle of Stewart and Hamilton" 2 involves the injection of a known amount of colored substance into a vein and collection of serial samples of blood from an artery for determination of the concentration of dye. Other substances have been used for injection, such as salt solution and radioactive cells.3' 4 The validity of t...

Methods 31 deidentified subjects with tIgE 1000-5000 kU/L (Group A) and 10 subjects with tIgE >5000 kU/L (Group B) had sIgE measurement for egg, milk, wheat, peanut, and soybean by ImmunoCap from undiluted and 4 serial two-fold dilutions using manufacturer supplied diluent. Myeloma IgE was prepared at an initial dilution of 1:28 and then 7 serial two-fold dilutions were performed. tIgE percenta...

The range of antibiotics available for therapy is extending steadily, and in consequence there is an increasing demand on the services of the laboratory. Chloramphenicol has now been added to the free list, aureomycin is being used for certain prescribed conditions, and terramycin is generally available in the U.S.A. This form of therapy should be subjected to bacteriological control, and it is...

According to the International Dairy Federation, the quality of raw milks shall be evaluated by the determination of "total" bacterial counts, or standard plate count (SPC); after serial dilution of the milk samples, the SPC is determined on Plate Count Agar (PCA) by the "pour plate" method; the viable bacteria are enumerated after aerobic incubation for 2 or 3 days, at 32 °C or 30°C respectively.

Serial determinations of the exchangeable sodium content and sodium24 (Na24) space were made by the radioisotope dilution method in patients with congestive failure during the course of intensive therapy. In most instances, the decrease in body weight was too great to be accounted for solely on the basis of the change in sodium24 space or exchangeable sodium content. This excess weight loss is ...

Twenty-one strains of Campylobacter pylori (Campylobacter pyloridis) were tested for susceptibility to norfloxacin and other agents by the serial agar dilution method. Ampicillin (MIC for 90% of isolates [MIC90], 0.016 micrograms/ml) and famotidine (MIC90, greater than 1,024 micrograms/ml) were, respectively, the most and the least active of the agents tested. Norfloxacin (MIC90, 1 microgram/ml...

Twenty Baylis-Hillman adducts were synthesized from different aromatic aldehydes and activated vinyl derivatives. The adducts, which are differently substituted 3-hydroxy-2-methylene-3-phenylpropionic acid derivatives, were screened for their antimicrobial activity in vitro by the serial dilution method. Many of these molecules displayed potent antibacterial and antifungal activities. The ease ...