Campaign groups have sprung up to oppose the industry, which relies on an extraction technique called hydraulic fracturing, or 'fracking'.

Introduced a cataract extraction technique that remained the standard for over 100 years, and many other important surgical techniques such as iridectomy.

For several weeks following the utility's release no success using the author's key extraction technique was reported.

Essential oils are usually prepared by fragrance extraction techniques such as distillation (including steam distillation), cold pressing, or extraction (maceration).

Bioactive molecules are extracted by traditional solvent extraction techniques or by super critical fluid extraction.