Method 2. (Modification of Napier, 1922.) Here instead of four drops of blood being taken directly from the patient's finger at the time of the test, as done by Napier, an equal quantity of previously collected blood was put into a small test tube containing c. c. of citrated saline (Formula : sod. cit. 0.5 grm., sod. chlor. 0.9 grm., and water 100 c. c.). After adding a drop of formalin, it wa...

We have purified pili from isogenic opacity colony variants that were derived from 14 gonococcal strains. Pili purified from opaque colonies of one strain usually differed from pili purified from transparent colonies of the same strain. In 10 of the 14 strains examined, the apparent subunit molecular weight of pilin isolated from the opaque variants was larger than that seen with pilin obtained...