(1) It used to be a real problem to refine sugar before his invention made the process simpler and more profitable.

(2) Universities not only transmit knowledge, they also refine existing knowledge and develop new knowledge and ideas.

(3) Rundle and Holliday are working to refine the method and find new ways to visualize the data.

(4) He attempted to simplify and refine existing theories and to present them from new perspectives.

(5) Arabs were probably the first to cultivate and refine sugar around the Mediterranean.

(6) We then used the results of our analysis to refine the original theory and to add to the literature in new ways.

(7) I try to touch on topics that I feel are universal, and refine my methods of communication so what I'm saying is clear to any listener.

(8) Good investors continually refine their stock picking method, tweaking it here and there.

(9) Copper sulfate comes from refining the metal and is used as a fungicide.

(10) Traditionally, low-grade heroin is refined from Afghan opium.

(11) But perhaps the most impressive feat was refining the oil to run vehicles.

(12) A large portion of imported Nigerian oil is refined into gasoline due to its low sulfur content.

(13) The second heating refines the coarse grains and leaves the steel in a softened condition.

(14) It now refines Saudi oil and has emerged as a banking powerhouse for the Islamic world.

(15) The Prime Minister and his Deputy met representatives of Australia's four major oil refiners in Sydney today to discuss how they'll reach the government's biofuels target.

(16) The mining corporation stations thrived as they specialised in refining the raw materials needed by everyone.

(17) Freud's theories were incidental - useful in refining traditional methods of popular control perhaps, but a sideshow.

(18) Most horticultural oils are refined from crude oil.

(19) When oil is refined this reaction is used to remove unwanted alkenes.

(20) In the 150 years human being have drilled for and refined petroleum, it's estimated we've used about 1 trillion barrels.