ultratrace element

См. также в других словарях:

• Ultratrace element — In biochemistry, an ultratrace element is a chemical element that normally comprises less than one microgram per gram of a given organism …   Wikipedia

• Period 2 element — A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the… …   Wikipedia

• Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of …   Wikipedia

• Boron — (pronEng|ˈbɔərɒn) is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element on… …   Wikipedia

• Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh …   Wikipedia

• Второй период периодической системы — Ко второму периоду периодической системы относятся элементы второй строки (или второго периода) периодической системы химических элементов. Строение периодической таблицы основано на строках для иллюстрации повторяющихся (периодических) трендов в …   Википедия

• Composition of the human body — The composition of the human body can be looked at from several different points of view. By mass, human cells consist of 65–90% water (H2O). Oxygen therefore contributes a majority of a human body s mass. Almost 99% of the mass of the human body …   Wikipedia

• Dietary mineral — Dietary minerals (also known as mineral nutrients) are the chemical elements required by living organisms, other than the four elements carbon, hydrogen, nitrogen, and oxygen present in common organic molecules. Examples of mineral elements… …   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

• Silicon — Not to be confused with the silicon containing synthetic polymer silicone. aluminium ← silicon → phosphorus C ↑ Si ↓ Ge …   Wikipedia

• Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …   Wikipedia