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.
Full Definition of DOWNSTREAM. 1. : in the direction of or nearer to the mouth of a stream. 2. : in or toward the latter stages of a usually industrial process or the stages (as marketing) after manufacture.See downstream defined for English-language learners.See downstream defined for kids.ADVERTISEMENT.ull Definition of DOWNSTREAM. 1. : in the direction of or nearer to the mouth of a stream. 2. : in or toward the latter stages of a usually industrial process or the stages (as marketing) after manufacture.