Larger objects, such as clumps of bacteria or tissue cells, are phagocytosed over the course of a more-prolonged response.
Douglas Bartlett of the Scripps Institute of Oceanography, who was in charge of the scientific side of Cameron's dive, has found clumps of bacteria attached to rocks in the Sirena Deep, east of Challenger Deep.
First, extraneous materials such as clumps of bacteria, discarded cuticles, or chemical precipitates that are often aspirated along with C. elegans are also measured by the Biosort.
Extraneous matter; such as detritus, clumps of bacteria, and embryos; can not be distinguished from nematodes directly from log(EXT) and log(TOF) measurements.
One feature of the Biosort data that also needed to be addressed by the model was the presence of extraneous material such as shed cuticles or clumps of bacteria, which accumulate as C. elegans develop over time.
Alternatively, we observed that USA300 caused significant aggregation and clumping of host cells and bacteria in blood at late time points (Fig. 1A) and this phenomenon would decrease the number of recovered CFUs, since it was not possible to completely disaggregate clumps of bacteria.
In work previously reported by this laboratory, we demonstrated using immunohistochemical examination of intestinal tissues (cecal) obtained from mice colonized with P. aeruginosa that clumps of bacteria were trapped within the mucus layer of the murine cecums, while few bacterial cells were associated with the underlying epithelial cells[36].
Clumps of bacteria were removed by mild-ultrasonication for 10 min followed by a low-speed centrifuge for 1 min. Confluent macrophage cultures (2×108 for exosome-isolation and 5×105 for CFU assays) were infected with single-cell suspension of mycobacteria at multiplicity of infection (MOI) of 10∶1 (of60.1of 0.1).
Be careful not to get clumps of bacteria in the solution.
To eliminate clumps of bacteria, after washing, cells were shaken with glass beads for 15 mins and then resuspended in PBS.
