Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces, Actinomyces radicidentis Collins, Hoyles, Kalfas, Sundquist, Monsen, Nikolaitchouk and
Gram-positive coccoid cells. Non-motile. Non-spore-forming. Non-acid-fast.
Facultative anaerobic. Grows on Columbia blood agar at 37 ºC in 48 h.
Isolated from infected root canals of human teeth; habitat is unknown.
Isolated from infected root canals of human teeth.
- Collins MD, Hoyles L, Kalfas S, Sundquist, Monsen T, Nikolaitchouk N, and Falsen E, 2003. Characterisation of Actinomyces
isolates from infected root canals of teeth: description of Actinomyces radicidentis sp. nov. J Clin Microbiol. 38, 9, 3399-3403.
Description is based on API Rapid ID32 Strep, API ZYM and API Coryne results.
Positive results for acid phosphatase, catalase, esculin hydrolysis, gelatin hydrolysis
(weak reaction), alpha- and beta-galactosidase, alpha- and beta-glucosidase,
beta-galacturonidase, leucine arylamidase, pyrazinamidase, Voges-Proskauer test, acid production from D-glucose, lactose,
maltose, mannitol, melibiose, melezitose, ribose, methyl-beta-D-glucopyranoside, raffinose, sucrose and trehalose.
Negative results for alkaline phosphatase, arginine dihydrolase, ester lipase C8, alpha-fucosidase, beta-glucuronidase,
N-acetyl-beta-glucosaminidase, hippurate hydrolysis, lipase C14, alpha-mannosidase, trypsin, chymotrypsin, acid production from
L-arabinose, D-arabitol, cyclodextrin, glycogen, pullulan, sorbitol and tagatose.
Variable results for nitrate reduction and urease.
(c) Costin Stoica