Neutrophils are the most common type of white blood cell, comprising about 50-70% of all white blood cells. They are phagocytic, meaning that they can ingest other cells, though they do not survive the act. Neutrophils are the first immune cells to arrive at a site of infection, through a process known as chemotaxis.
One of the basic theories stipulates that increasing interest rates raise consumers' and manufacturers' costs, which, in turn, reduces the amount of time and money people spend driving. Less people on the road translates to less demand for oil, which can cause oil prices to drop.
Saudi Arabia has raised domestic energy prices by as much as 40 percent after the world's leading oil producer announced a record $98bn budget deficit on Monday citing rock-bottom global petroleum prices. The budget deficit is the highest in the history of Saudi Arabia, but was not as big as some expected.