off in ▁as ▁Mother ▁ ▁References ▁ ▁Bibli ography ▁ ▁Low , ▁Rach ael . ▁History ▁of ▁the ▁British ▁Film , ▁ 1 9 1 8 - 1 9 2 9 . ▁George ▁Allen ▁& ▁Un win , ▁ 1 9 7 1 . ▁ ▁External ▁links ▁ ▁Category : 1 9 2 4 ▁films ▁Category : 1 9 2 0 s ▁advent ure ▁films ▁Category : B rit ish ▁films ▁Category : B rit ish ▁silent ▁feature ▁films ▁Category : B rit ish ▁advent ure ▁films ▁Category : English - language ▁films ▁Category : Fil ms ▁directed ▁by ▁S inc la ir ▁Hill ▁Category : Fil ms ▁based ▁on ▁British ▁nov els ▁ ▁Category : St oll ▁Pictures ▁films ▁Category : Fil ms ▁shot ▁at ▁Cr ick le wood ▁Studios ▁ ▁Category : B rit ish ▁black - and - white ▁films <0x0A> </s> ▁In ▁bi ology , ▁a ▁sub c ulture ▁is ▁a ▁new ▁cell ▁or ▁micro bi ological ▁culture ▁made ▁by ▁transfer ring ▁some ▁or ▁all ▁cells ▁from ▁a ▁previous ▁culture ▁to ▁fresh ▁growth ▁medium . ▁This ▁action ▁is ▁called ▁sub c ult uring ▁or ▁pass aging ▁the ▁cells . ▁Sub c ulture ▁is ▁used ▁to ▁prolong ▁the ▁life ▁and / or ▁expand ▁the ▁number ▁of ▁cells ▁or ▁micro organ isms ▁in ▁the ▁culture . ▁ ▁Ro le ▁Cell ▁lines ▁and ▁micro organ isms ▁cannot ▁be ▁held ▁in ▁culture ▁in def initely ▁due ▁to ▁the ▁grad ual ▁rise ▁in ▁to xic ▁met abol ites , ▁use ▁of ▁nut ri ents