nitrogen requirement

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• Liquid nitrogen economy — A liquid nitrogen economy is a hypothetical proposal for a future economy in which the primary form of energy storage and transport is liquid nitrogen. It is proposed as an alternative to liquid hydrogen in some transport modes and as a means of… …   Wikipedia

• Common Brushtail Possum — Common Brushtail Possum[1] Common brushtail possums at Austins Ferry, Tasmania, Australia Conservation status …   Wikipedia

• Common ringtail possum — Common ringtail possum[1] Conservation status …   Wikipedia

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium

• Nutrition — The Nutrition Facts table indicates the amounts of nutrients which experts recommend to limit or consume in adequate amounts. Nutrition (also called nourishment or aliment) is the provision, to cells and organisms, of the materials necessary (in… …   Wikipedia

• nutrition, human — Introduction       process by which substances in food are transformed into body tissues and provide energy for the full range of physical and mental activities that make up human life.   The study of human nutrition is interdisciplinary in… …   Universalium

• bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/, n.pl., sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …   Universalium

• nutrition — nutritional, nutritionary, adj. nutritionally, adv. /nooh trish euhn, nyooh /, n. 1. the act or process of nourishing or of being nourished. 2. the science or study of, or a course of study in, nutrition, esp. of humans. 3. the process by which… …   Universalium

• petroleum refining — Introduction  conversion of crude oil into useful products. History Distillation of kerosene and naphtha       The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… …   Universalium

• Protein (nutrient) — This article is about protein as a nutrient. For protein as a class of molecule, see protein. For other uses, see bodybuilding supplement. Amino acids are the building blocks of protein. Proteins are polymer chains made of amino acids linked… …   Wikipedia

• vitamin — vitaminic, adj. /vuy teuh min/; Brit. also /vit euh min/, n. any of a group of organic substances essential in small quantities to normal metabolism, found in minute amounts in natural foodstuffs or sometimes produced synthetically: deficiencies… …   Universalium