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.
1 in or towards the lower part of a stream; with the current. 2 (in the oil industry) of or for the refining, distribution, or marketing of oil or its derived products. Compare â upstream â 2. English Collins Dictionary-English Definition & Thesaurus &nbsp.See also: downstage, downstate, downs, down-market. Add your entry in the Collaborative Dictionary.ompare â upstream â 2. English Collins Dictionary-English Definition & Thesaurus &nbsp. See also: downstage, downstate, downs, down-market. Add your entry in the Collaborative Dictionary.