ABSTRACT
The choice of ethyl violet as a pH indicator in soda lime is not the best. Color change happens too late because pH alteration of the surface of soda lime is slower than in the core of the canister. Clinical and comparative measurement of wall temperature of two in series canisters is a good precaution. If the down stream canister is warmer than the upstream one, you must change the latter.
Subject(s)
Anesthesia, Closed-Circuit/methods , Calcium Compounds , Oxides , Sodium Hydroxide/standards , Humans , Hydrogen-Ion Concentration , Rosaniline DyesABSTRACT
For the primary isolation of Mycobacterium bovis from bovine lesions, 1-hexadecylpyridinium chloride (HPC) at a concentration of 0.75% was as effective as 2% NaOH in controlling the growth of contamination. The advantages of using HPC over NaOH are that it is a rapid one-step procedure not requiring neutralisation with acid, it is less toxic to M. bovis thus increasing isolation rates, and it promotes the earlier appearance of colonies.
Subject(s)
Cetylpyridinium/standards , Decontamination/standards , Mycobacterium bovis/isolation & purification , Pyridinium Compounds/standards , Sodium Hydroxide/standards , Animals , Bacteriological Techniques , Cattle , Cetylpyridinium/analogs & derivatives , Cetylpyridinium/pharmacology , Sodium Hydroxide/pharmacology , Time FactorsABSTRACT
New phosphor crystals, on the basis of zeolit, activated by tin (Sn), appeared to be a very suitable permanent fluorescent test-object for setting up microscopes, intructing new users and for calibrating microfluorimeters. Their properties provide the control of conditions of various fluorescent experiments in both visible and ultraviolet regions. The crystal size may vary from 1 to 100 micron along the facet. Spectral, polarization and fading fluorescence characteristics of the new crystals are described.
