Type checking and type inference are important concepts and methods of programming languages and software engineering. Type checking is a way to ensure some level of consistency, depending on the type system, in large programs and in complex assemblies of software components. Type inference provides powerful static analyses of preexisting programs without types, and facilitates the use of type ...

from a total of 600 nose and throat introduction swabs examined for diphtherie, 200 or 33% were positive. cultures were carfully classified on the basis of morphological appearance and biochemical characteristics into gravis, mitis and intermedius groups.  a special tellurite serum agar was used for colonial appearance. neill's broth culture was employed for haemolytic tests. the virulence of e...

Study of the capsular genome of pneumococcus has shown that it controls a multiplicity of biochemical reactions essential to the synthesis of capsular polysaccharide. Mutation affecting any one of several biochemical reactions concerned with capsular synthesis may result in loss of capsulation without alteration of other biochemical functions similarly concerned. Mutations affecting the synthes...