Most natural food contains a mixture of such substances.
If so, the appearance of such substances in other organisms is not too surprising.
Polarizing filters enhance colour vividness by reducing glare from the reflecting surfaces of such substances as glass and water.
Study of such substances, which normally have little or no carbon, constitutes the discipline of inorganic chemistry.
Terrorism experts said mailings of such substances were the least of their concerns, however, given the larger threat they pose to targets like the food supply.
Government crackdowns and surveillance has led to greater pent-up anxiety, and in many ways encouraged the use of such substances, the source added.
Surveys suggest that Britons are more likely than other Europeans to buy drugs on the web, the most common way to get hold of such substances.
The molecules of such substances contain long hydrocarbon chains, which make them insoluble in water, but they also carry ionic groups that attract ions of opposite charge.
In the area of chemistry, Muslim scholarship led to the discovery of such substances as potash, alcohol, nitrate of silver, nitric acid, sulfuric acid, and mercury chloride.
A relatively significant amount of helium has also been detected, along with smaller percentages of such substances as calcium, sodium, water, ammonia, and formaldehyde.
The growing use of such substances, which doctors say can lead to side effects that basically shut down normal adolescent development in male bodies, has also created problems for law enforcement.
