Example sentences of "has been known for [adj] time " in BNC.

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1 The latter phenomenon has been known for some time , Zwaardemaker recording several ‘ cancelling pairs ’ as far back as 1875 , which included :
2 The powerful hydrogen bonding capacity of fluoride , discussed by John Emsley , has been known for some time , but its potential for interfering with the vitally important hydrogen bonds between biomolecules has only recently begun to receive attention .
3 It has been known for some time that eyes give out bioelectric signals — the retina has a positive charge , the cornea is negative .
4 Segmentation is not an innovation in woodturning , and has been known for some time .
5 It has been known for some time that the majority of fibres from the left and right eyes converge upon single cells in the visual cortex of the cat and monkey ( Hubel and Wiesel , 1967 ) .
6 Although the link between social deprivation and road accident casualty rates has been known for some time , the scale of the problem has not been assessed either nationally or locally .
7 Is not the Minister aware that it has been known for some time that four times as many women as men suffer the chronic pain that comes from the loss of movement in and the fracture of hip joints ?
8 It has been known for some time that the inactive form of ALDH2 is present in about 50% of Japanese and Chinese and is associated with high acetaldehyde concentrations , an exaggerated flush response to alcohol , and seems to protect against alcoholism .
9 It has been known for some time that versatile plastics could be made from vegetable matter but production costs have been prohibitive .
10 It has been known for some time that the Inland Revenue has been taking a close interest in the marketing practices of livestock farmers in parts of Wales and the West Country .
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