Background: Helicobacter pylori (Hp) establishes life-long gastric infection in billions of humans, and is often responsible for diseases such as peptic ulcer and gastric cancer. Cumulative actions of genetic drift and natural selection over...
Construction equipment; Sewerage; Hoisting machinery; Men; Construction workers; Sewerage
Construction machinery with a crane next to a large pile of dirt. Four men are in a pit near the machinery's scoop or shovel. Cars are parked along the road in the background. Title supplied by cataloger.
Construction; Maintenance & repair; Sewerage; Construction equipment; Hoisting machinery; Sewerage; Men; Construction workers; Sewers; Pipes (Conduits); Pipes (Conduits)
Cranes and other machinery are on a dirt site next to a tunnel in partial stages of completion and covered partially by tarps. Men work on the site which is covered with lumber and other materials.Title supplied by cataloger.