General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

Hafnium

Science; General science

A metallic element, symbol Hf, atomic number 72, and atomic weight 178.49. There are five naturally occurring isotopes. It is one of the less abundant elements in the Earth's crust.

A method of chemical analysis based on the optical activity of the substance being determined. Optically active materials are asymmetric; that is, their molecules or crystals have no plane or centre ...

Bioassay

Science; General science

A method for the quantitation of the effects on a biological system by its exposure to a substance, as well as the quantitation of the concentration of a substance by some observable effect on a ...

Liquid chromatography

Science; General science

A method of chemical separation that involves passage of a liquid phase through a solid phase and relies on subtle chemical interactions to resolve complex mixtures into pure compounds. A small ...

Combinatorial synthesis

Science; General science

A method for preparing a large number of chemical compounds, commonly known as a combinatorial library, which are then screened to identify compounds having a desired function, such as a particular ...

Combinatorial chemistry

Science; General science

A method in which very large numbers of chemical entities are synthesised by condensing a small number of reagents togther in all combinations defined by a small set of reactions. The main objective ...

Distillation

Science; General science

A method for separating homogeneous mixtures based upon equilibration of liquid and vapour phases. Substances that differ in volatility appear in different proportions in vapour and liquid phases at ...