Consistent decisions on the degree of equivalence between metal specifications of different national origins cannot be made only on the basis of chemical composition and direct comparison of mechanical property numbers. There are numerous additional factors, which, if present, can influence the determination of equivalency because of their effect on property requirements. In order to remove the uncertainty in this decision-making process, these additional factors must be evaluated in each comparison. A generalized approach has been developed in which evaluation criteria have been identified and discussed in terms of their role in the determining of equivalence. These criteria are presented as part of a guideline for conducting material specification comparisons.
A semi-automated multiple inoculator system was modified and evaluated for use with 25-compartment petri dishes. Twenty-one species of environmental and culture collection bacteria were tested for the following characteristics: nitrate reduction, indole production, methyl red reaction, acid from glucose, gelatin hydrolysis, phenylalanine deaminase, citrate utilization, aesculin hydrolysis, reactions on skim milk agar, arginine dihydrolase, and urea hydrolysis. The agreement between the inoculator system and conventional methods was 90 to 100% for all tests except arginine dihydrolase and urea hydrolysis. The multiple inoculator described was judged a simple and versatile device for the rapid identification of large numbers of bacteria.
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