Example sentences of "[prep] [be] necessary for [adj] [noun] " in BNC.

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1 Gibberellin , shown to be necessary for continued growth of dodder vine tips in aseptic cultures , also interacts with cytokinins and auxins in the growth of subapical segments ; it augments their effects .
2 This region has been found in the sea urchin gene to be necessary for maximal transcription in in vitro experiments , a similar function to that found in vivo for oligo I ( 26 ) .
3 Thus , the more documents that an indexing system is likely to embrace , the greater the number of index terms that are likely to be necessary for convenient retrieval ( given that the number of documents which constitute a scannable category does not vary ) .
4 ‘ For a long time the courts have , without objection from Parliament , supplemented procedure laid down in legislation where they have found that to be necessary for this purpose .
5 ‘ For a long time the courts have , without objection from Parliament , supplemented procedure laid down in legislation where they have found that to be necessary for this purpose .
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