Bacillus mesophilus
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Bacillota (Firmicutes), Class Bacilli, Order Caryophanales, Family Bacillaceae, Genus Bacillus, Bacillus mesophilus Zhou et
al. 2017.
Species description is based on a single isolate.
Gram-positive rods, 0.5-0.8 x 2.0-5.0 µm, occurring singly or in short chains. Motile by
one polar flagellum. Produce sub-terminal, ellipsoidal endospores, not deforming the
cell.
Colonies grown at 30 ºC on MA for 48 h are circular, pale pink in colour, flat, about 1-2
mm diameter. Growth occurs at 20-40 ºC (optimum 35 ºC), pH 5.0–11.0 (optimum pH
8.0), with 0-10% (w/v) NaCl concentration (optimum 3-4%). Aerobic; no anaerobic
growth.
Isolated from a soil sample collected from a deserted saltworks at Wendeng, Shandong Province, China.
Undetermined.
  1. Zhou YX, Liu GH, Liu B, Chen GJ, Du ZJ. Bacillus mesophilus sp. nov., an alginate-degrading bacterium isolated from a soil
    sample collected from an abandoned marine solar saltern. Antonie Van Leeuwenhoek 2016; 109:937-943.
  2. Xie J, Cheng K, Zhao D, Yang G, Qiao Z, Qiu S, Yu X, Liu H, Li T, Feng H, et al. Bacillus aquiflavi sp. nov., isolated from yellow water
    of strongly flavored Chinese baijiu. Int J Syst Evol Microbiol 2020; 70:3406-3412.
Positive results for alginate hydrolysis, alkaline phosphatase, catalase, aesculin hydrolysis, gelatinase, alpha-galactosidase, alpha-
glucosidase, oxidase, acid production from: trehalose, sucrose, maltose, glycerol, D-xylose, glucose, fructose, mannose and N-
acetylglucosamine (only 5-ketogluconate is fermented in Xie's study).

Negative results for arginine dihydrolase, acid phosphatase, citrate utilization, egg yolk reaction, H
2S production, indole production,
lysine decarboxylase, nitrate reduction, ornithine decarboxylase, tryptophan deaminase, Tween 80 hydrolysis, urease, acid production
from: D-mannitol, aesculin, cellobiose, D-tagatose and other substrates.

Variable results for beta-galactosidase and Voges–Proskauer test.
(c) Costin Stoica
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