Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.
Used in the Middle of Sentence
The gut bacteria are important for programming early immune responses, bioconverting ingested nutrients and inhibiting pathogenic bacteria.
Also bacteria belonging to Vibrio parahaemolyticus are known to produce several proteases and collagenases including metalloproteases of the zincins superfamily and serine proteases [21 –24 ].
No bacteria were observed to attach to the brush border of the midgut lumen or were seen in the ectoperitrophic space (between the PM and the midgut epithelium).
Used in the Beginning of Sentence
Bacteria were grown in microaerophilia as previously described [ 16 ] in static conditions to an OD 600  = 0.2 prior to being added to macrophages at a MOI of 100:1.
Bacteria were plated on trypticase soy agar (TSA), incubated at 37 °C for 15 h and subsequently diluted using the McFarland optical density standard.
Used in the Ending of Sentence
The egg mass extracts of the marine gastropods Chicoreus virgineus, Chicoreus ramosus and Rapana rapiformis possess wide-spectrum antimicrofouling activity against 40 biofilm bacteria.
The underprocessed food still contained harmful bacteria.
There was no effect on enteric bacteria, enterococci, Lactobacillus, bifidobacteria, or total anaerobic bacteria.
Meaning of bacterium for the defined word.
Grammatically, this word "bacterium" is a noun, more specifically, a nouns with irregular plural and a countable noun.