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Developments in Biological Standardization|January 1, 1986
Effect of oxidation on the stability of tuberculin purified protein derivative (PPD)S Landi, H R HeldDevelopments in Biological Standardization|January 1, 1986
The need to redefine the unit of the international standard for tuberculin purified protein derivative (PPD-S)S Landi, H R HeldCanadian Journal of Microbiology|October 1, 1978
Isolation of tuberculin peptides from tuberculin purified protein derivative (PPD)K C Gupta, S LandiInfection and Immunity|February 1, 1980
Isolation, characterization, and biological properties of a tuberculin-active peptidoglycan isolated from the culture filtrate of Mycobacterium tuberculosisK C Gupta, S LandiJournal of Biological Standardization|January 1, 1977
Water permeability of elastomersH R Held, S LandiDevelopments in Biological Standardization|January 1, 1986
The significance of a dual skin test with PPD and PPD-B in humans after BCG vaccinationS Landi, M J AshleyJournal of Pharmaceutical Sciences|November 1, 1980
Binding of toxic metabolites of isoniazid by aconiazideH R Held, S LandiThe American Review of Respiratory Disease|January 1, 1975
Effect of light on tuberculin purified protein derivative solutionsS Landi, H R HeldJournal of Biological Standardization|July 1, 1985
Loss of preservative from a tuberculin solution in rubber stoppered vials fastened with different sealsH R Held, S LandiApplied Microbiology|November 1, 1970
Comparative study of 14C-labeled purified protein derivative from various mycobacteria. II. Skin cross-reactivity in sensitized guinea pigsS Landi, H R HeldPageof 11