The WHO Expert Committee on Biological Standardization authorized the National Institute for Medical Research to establish an International Reference Preparation of Erythropoietin on the basis of the results of an international collaborative assay and to define an international unit with the agreement of the participants.The material investigated was a research ...

The Central Veterinary Laboratory, Weybridge, England, was requested by the WHO Expert Committee on Biological Standardization to obtain suitable material for an international reference preparation of tylosin and to arrange a collaborative assay. A batch of 150 g of highly purified tylosin was assayed by ten laboratories in nine countries ...

Coordination of certain types of geophysical observations and analyses throughout the world is accomplished by the advance selection of days and intervals for such work. A committee under the International Council of Scientific Unions has issued the calendar for 1962, together with a brief explanation and examples of how it ...

The Third International Reference Preparation of Egg Lecithin was produced (in a quantity of 5000 ml) at the WHO Serological Reference Centre, Copenhagen, and assayed in 1958 against the Second International Reference Preparation by four laboratories in three countries. Complement-fixation and slide-flocculation tests were used. The new preparation was found ...

Coordination of certain types of geophysical observations and analyses throughout the world is accomplished by the advance selection of days and intervals for such work. A committee under the International Council of Scientific Unions has issued the calendar for 1961, together with a brief explanation and examples of how it ...

The International Reference Preparation for Vitamin B(12) was prepared in tablet form from a mixture of anhydrous cyanocobalamin and sodium chloride. In an international collaborative study, in which eleven laboratories participated, this preparation was examined qualitatively and quantitatively by spectrophotometric and microbiological methods. It was concluded that the International Reference ...

In accordance with authorization given by the WHO Expert Committee on Biological Standardization in 1950, the National Institute for Medical Research, London, obtained samples of two bacterial pyrogens and arranged for an international study of their pyrogenic properties in rabbits. The results of this study showed that the dose response ...

The International Reference Preparation for Opacity has been established by the WHO Expert Committee on Biological Standardization. The preparation is a suspension of Pyrex-glass particles of approximately the size of bacteria, and is similar to the standard for opacity used by the National Institutes of Health (Public Health Service), Bethesda, ...

The International Reference Preparation of Penicillin K was established by the WHO Expert Committee on Biological Standardization at its fifth session, held in Geneva in 1951. Since the preparation is likely to be used for research only, no unit has been defined. The composition of the preparation, in terms of ...