Detection of pectolytic activity andpel homologous sequences inFrankia
29
Citation
61
Reference
10
Related Paper
Citation Trend
Keywords:
Pectin
Frankia
Plant Physiology
Background Many investigators have recognised that a significant proportion of environmental bacteria exist in a viable but non-culturable state on agar plates, and some researchers have also noticed that some of such bacteria clearly recover their growth on matrices other than agar. However, the reason why agar is unsuitable for the growth of some bacteria has not been addressed. Methodology/Principal Findings According to the guide of a bioassay for swarming inhibition, we identified 5-hydroxymethylfuran-2-carboxylic acid (5-HMFA) and furan-2-carboxylic acid (FA) as factors that inhibit bacterial swarming and likely inhibit extracellular polysaccharide production on agar. The furan-2-carboxylic acids 5-HMFA and FA effectively inhibited the swarming and swimming of several environmental bacteria at concentrations of 1.8 and 2.3 µg L−1 (13 and 21 nmol L−1), respectively, which are equivalent to the concentrations of these compounds in 0.3% agar. On Luria-Bertani (LB) plates containing 1.0% agar that had been previously washed with MeOH, a mixture of 5-HMFA and FA in amounts equivalent to their original concentrations in the unwashed agar repressed the swarming of Escherichia coli K12 strain W3110, a representative swarming bacterium. Conclusions/Significance Agar that contains trace amounts of 5-HMFA and FA inhibits the proliferation of some slow-growing or difficult-to-culture bacteria on the plates, but it is useful for single colony isolation due to the ease of identification of swarmable bacteria as the non-swarmed colonies.
Swarming (honey bee)
Bacterial growth
Nutrient agar
Cite
Citations (24)
The following protocol is for making LB agar plates for the purpose of bacterial selection (500mL of LB agar makes about 25 LB agar plates). For the full abstract and additional resources, please visit https://www.addgene.org/plasmid_protocols/bacterial_plates/
Cite
Citations (0)
Petri dish
Cite
Citations (6)
The following protocol is for making LB agar plates for the purpose of bacterial selection (500mL of LB agar makes about 25 LB agar plates). For the full abstract and additional resources, please visit https://www.addgene.org/plasmid_protocols/bacterial_plates/
Cite
Citations (0)
Potato dextrose agar
Isolation
Cite
Citations (4)
Microbiological assay plates containing agar stained with fast green and inoculated with test microorganisms could be readily distinguished from unstained seeded agar plates. The boundaries of zones of growth inhibition were more sharply defined in those plates which contained stained agar.
Agar diffusion test
Brilliant green
Agar gel
Cite
Citations (1)
Petri dish
Cite
Citations (344)
SUMMARYThe sensitivity of five solid media for detection of Bacillus larvae spores in honey samples; J agar, MYPGP agar, brain heart infusion (BHIT) agar, Colombia agar and horse blood agar was compared in air or under 5% C02. MYPGP agar is superior to all other media tested for detection of low spore levels of B. larvae in honey. Incubation under 5% C02 enhances growth considerably, especially for MYPGP agar and J agar. The plating efficacy described here, where an average of 23% of inoculated spores germinated on MYPGP agar, is higher than reported elsewhere for B. larvae. Thus, contamination levels as low as 200 B. larvae spores/g of honey can be detected with more than 95% probability on MYPGP agar incubated under 5% C02 if 12 or more plates are inoculated.
Cite
Citations (59)
Cite
Citations (1)
Microbiological assay plates containing agar stained with fast green and inoculated with test microorganisms could be readily distinguished from unstained seeded agar plates. The boundaries of zones of growth inhibition were more sharply defined in those plates which contained stained agar.
Agar diffusion test
Agar gel
Brilliant green
Cite
Citations (0)