background: potency test for control of rubella vaccine is a significant factor to qualify production line and vaccination pro­gram. for this reason, who recommends to use the microtitration method by both vaccine companies and control laborato­ries. then the study was done to improve this test. methods: three rubella virus samples, including an in-house standard, a lot of vaccine and an in- pr...

I HE MICIIODETERMIXATION of fiee fatt acids (FFA) in plasma has received colisiderable attelition in recent years (1-8). Although a riumher of different procedures Ilave beemi reported, most of them consist of 2 essential steps: tire extraction of tire FFA from plasnla with orgamlic solvents, an(1 the titration of the extracted FFA in a 2-phase system with a standard aqueous base. Various extra...

The deteriorating quality of the environment and consequently stricter emission limits force the produc­ ers of pollutants to modernize their current technolo­ gies, to reduce technologies with toxic materials or to v minimalize emissions. The industrial use of formaldehyde in various fields such as textile, wood, leather, and food process­ ing industry causes a major environmental problem. For...

A microtitration serum agglutination test, based on that used for brucellosis, has been developed to detect antibodies in the sera of horses exposed to the contagious equine metritis (CEM) organism. Two known positive sera were tested 100 times in 15 separate tests. The results were reproducible to within a twofold range. The test is capable of being carried out within 100 min.

A commercially available instrument that automatically makes serial dilutions and delivers reagents was used for the determination of antistreptolysin O titers in serum. The automated method was compared with tube-dilution and manual microtitration techniques. It gave higher reproducibility of results and was quicker to perform than both the other tests; and it was much more economical in reage...