Lloyd D. Felton

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We are dealing, as the results show, with groups of chemicals, all of which, whether bacteriotropic or not, greatly inhibit the engulfing of Staphylococcus aureus by leucocytes. Not a sufficiently large number of experiments was performed in attempt to cure experimental staphylococcus infections to warrant any condusion in regard to possible therapeutic(More)
1. An automatic apparatus is described by which a new supply of food can be furnished actively growing organisms at any desired interval of time-an automatic transferring device. 2. A single strain of pneumococcus, Type I, Neufeld, which had become avirulent for mice, acquired virulence of maximal degree when grown in the described apparatus with skimmed(More)
1. A simple technique is described for studying the oxidase action of bacteria by means of the oxidation of p-aminoleucomalachite green. 2. It is shown that pneumococci under aerobic conditions produced an oxidase when grown on suitable medium. The sera of any of seven different animal species constitute such a medium, the degree of oxidation by the(More)
It has been shown with one strain of pneumococcus (Type 1, Neufeld), that hydroquinine chloroacetanilide (C 29), hydroquinine p-chloroacetylaminophenol hydrochloride (C 36), hydroquinine m-chloroacetylaminophenol hydrochloride (C 40), and hyroquinine 4-chloroacetylaminopyrocathecol hydrochloride (C 110) have a rapid pneumococcidal activity both in vitro and(More)
1. A highly virulent strain of pneumococcus, Type I, Neufeld, when grown in an automatic transferring device at 2 hour intervals on different lots of plain broth adjusted respectively to pH = 6.5, 7, 7.5, or 7.8, lost its virulence at a rate in direct ratio to the H ion concentration of the media-the more acid the media, the more rapid the decrease. 2.(More)
This paper is the second of a series on the study of virulence of microorganisms grown in vitro. Paper I t is a preliminary investigation and has to do with the influence of virulence on microorganisms transferred during the logarithmic increase phase-the period of optimum multiplication activity. In recent years, considerable attention has been directed(More)
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