activity or concentration gradient is employed
51Living machines — are a form of biological wastewater treatment designed to mimic the cleansing functions of wetlands. They are intensive bioremediation systems that can also produce beneficial by products such as methane gas, edible and ornamental plants, and… …
52Nutrient cycle — …
53Nitroglycerin — This article is about the chemical properties of nitroglycerin and its use as an explosive. For medical and pharmacological applications, see glyceryl trinitrate (pharmacology). Nitroglycerin …
54River Don, South Yorkshire — River Don The River Don as it flows past Hillsborough Stadium. Origin Pennines …
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