These include oxygen, nitrogen, carbon dioxide, hydrogen and methane.

Gases used include CO, natural gas or nitrogen.

Such systems may include water cooling, phase change materials, thermoelectric/Peltiercoolers, and liquid nitrogen.

Typical carrier gases include helium, nitrogen, argon, hydrogen and air.

Some experts believe it may even have included frozen oxygen or nitrogen.

Another technique is to add yeast nutrients, include nitrogen, to the must.

They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen.

Liebig denied the need to include nitrogen because it was available as gas from air.

The best fertilizers provide the essential elements for plant life, which primarily include potassium, phosphorus, and nitrogen.

Recent reports include biofuels, environmental nitrogen, and biodiversity.