( ( Divide ( ( ( this number ) ( by ( ( the concentration ) ( of ( ( the plasma ) ( you ( are ( giving ( to ( ( come up ) ( with ( ( the volume ) ( of plasma ) ) ) ) ) ) ) ) ) ) ) ) ) necessary ) ) . )
(ROOT (S (VP (VB Divide) (S (NP (NP (DT this) (NN number)) (PP (IN by) (NP (NP (DT the) (NN concentration)) (PP (IN of) (NP (NP (DT the) (NN plasma)) (SBAR (S (NP (PRP you)) (VP (VBP are) (VP (VBG giving) (S (VP (TO to) (VP (VB come) (PRT (RP up)) (PP (IN with) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (NN plasma))))))))))))))))) (ADJP (JJ necessary)))) (. .)))
Divide this number by the concentration of the plasma you are giving to come up with the volume of plasma necessary.
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NP (NNS particles)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PP (IN in) (NP (DT a) (VBN given) (NN volume)))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (NN concentration))))) (. .)))