Example sentences of "[conj] it is known that [noun sg] " in BNC.

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1 Dr Pertwee says the receptors are found in the brain areas where it is known that cannabis acts to produce many of its effects .
2 Although it is known that plasma concentrations of both peptides increase in response to feeding , the mechanism by which ingested food causes release of colonic hormones is not understood .
3 If it is known that behaviour depends smoothly , and the second derivative of the dependence is never zero and its first derivative is bounded away from zero , then the Newton-Raphson method is better .
4 Little is known about how and why these last two conditions are helped , but it is known that protection against osteoporosis lasts only as long as the treatment is taken .
5 It has often been said that the family kept the process secret , but this seems unlikely , since it is known that pearl ash was used to secure the transparency .
6 Reid is at the end of his contract with City and could join Rochdale , though Scarborough are also likely to show interest in him as it is known that manager Ray McHale wants to sign experienced players in the goalkeeping , central midfield , centre back and striking positions .
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