Mycobacterium smegmatisdisplays theMycobacterium tuberculosisvirulence-related neutral red character when expressing theRv0577gene

Neutral-red reaction is related to virulence and cell wall methyl-branched lipids in Mycobacterium tuberculosis.

Searching for virulence marking tests for Mycobacterium tuberculosis, Dubos and Middlebrook reported in 1948 that in an alkaline aqueous solution of neutral-red, the cells of the virulent H37Rv M. tuberculosis strain fixed the dye and became red in color, whereas the cells of the avirulent H37Ra M. tuberculosis strain remained unstained. In the 1950 and 1960s, fresh isolates of M. tuberculosis ...

The gastric neutral-red excretion test.

as a measure of gastric function, and various standardized tests have been devised. Owing, however, to the wide range of acid secretion in normal people, to the inconstant results obtained by repeating a test on many individuals, to the frequent occurrence of results well within the normal range in patients suffering from gastritis, gastric carcinoma, or peptic ulcer, and to the fact that from ...

Age-related changes in neutral lipid content of Paramecium primaurelia as revealed by nile red.

Cellular neutral lipid content of Paramecium primaurelia was measured during culture and clonal life using nile red (9-diethylamino-5H-benzo[alpha] phenoxazine-5-one), a dye utilized for lipid analysis in both mammalian cells and in ciliated protozoa. Lipid droplets in P. primaurelia are concentrated in the anterior pole of the cell; their number is maximum in early log phase cells and decrease...

Preventing Neutral Circulating Currents when Paralleling Generators

Influencing random transmission is a neutral character in hosts.

This study introduces an individual-based model on a host-parasite assemblage to investigate whether hosts are necessarily selected for obstructing the transmission of virulent parasites to conspecifics. Contrary to the widespread notion, a host's ability to influence parasite transmission within the host population is a neutral character provided that parasite transmission routes are random, w...