Theoretically, in vitro fertilisation could be performed by collecting the contents from a woman's fallopian tubes or uterus after natural ovulation, mixing it with sperm, and reinserting the fertilised ova into the uterus.
Upstream operations deal primarily with the exploration stages of the oil and gas industry, with upstream firms taking the first steps to first locate, test and drill for oil and gas. Later, once reserves are proven, upstream firms will extract any oil and gas from the reserve.
07/13/2010 3:29:05 AM EDT. upstream in the oil and gas is the term used in searchin for,recovery and the production of crude oil. while downstream refers to as oilrefineries,petrochemical plants,petroleum products distribution,retail outlets and natural gas distribution companies.