The chemical structures, spectral characters, methods of extraction and separation, toxicity and pharmacological activities of long-chain phenolic acids from exopleura of Ginkgo biloba were reviewed.

综述近年来有关银杏外种皮中已知的银杏酚酸类成分的化学结构、波谱性质、提取分离方法、毒性及药理作用等方面的研究概况。

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Research on camellia saponins at home and abroad was reviewed:1) methods of extraction;

总结了国内外有关油茶皂甙的研究概况 ：1）油茶皂甙的提取方法 ；

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Two common methods of extraction are grinding individual samples with mortar and pestle , and mechanical mincing.

目前常见的提取方法有人工研磨和机械破碎两种方法。

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Simon asserted the opposite: more people meant more brains meant better methods of extraction and lower usage per unit of production.

FORBES: But Why Did Julian Simon Win The Paul Ehrlich Bet?

In April 2012, a study by scientists at the US Geological Survey of the interior of the US found that events of magnitude 3 or greater had "abruptly increased in 2009" from 1.2 per year in the previous 50 years to more than 25 per year - although a number of gas and oil extraction methods may be implicated in the rise.

BBC: Oklahoma earthquake linked to oil extraction wastewater

This resource requires special extraction methods to get it out of the ground and into a form where it is fluid enough to travel down the pipelines for refining into gasoline and other hydrocarbon products.

FORBES: An Indian Consortium Shows Interest In ConocoPhillips' Alberta Oil Sands Assets