Another kind of prokaryote is the aerobic/microaerophilic, motile, helical/vibroid, gram-negative bacterium. This is a mouthful to say, but the name describes characteristics of this group of prokaryote bacteria.
Aerobic/microaerophilic means bacteria within this group require small amounts of oxygen to grow. Motile implies that the bacterium is self-propelled, using flagella at one or both poles to move in a corkscrew motion. Helical/vibroid indicates that the bacterium takes the shape of a spiral (helical) or as a curved rod (vibroid). Gram-negative means that when the bacterium is identified using the Gram stain, the bacterium loses the violet stain when rinsed and appears red or pink.
Aerobic/microaerophilic, motile, helical/vibroid, gram-negative bacteria thrive in soil and are found on roots of plants such as the Azospirillum, which improves a plant's nutrient uptake. Bacteria within this group are also found in both fresh and stagnant water.
Some aerobic/microaerophilic, motile, helical/vibroid, gram-negative bacteria cause diseases (pathogenic) such as Campylobacter fetus and Campylobacter jejuni. Campylobacter fetus causes spontaneous abortion in domestic animals. Campylobacter jejuni causes inflammation of the digestive tract (enteritis) resulting in food-borne intestinal diseases. Another common aerobic/microaerophilic, motile, helical/vibroid, gram-negative bacterium that is pathogenic is Helicobacter pylori. Helicobacter pylori cause gastric ulcers in humans.
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