Example sentences of "this [noun sg] over [art] period " in BNC.

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1 And I believe er , at this meeting it was revealed that Scottish Homes had received a tender from the West Lothian District Council for this work over a period of ten years for a figure which comes to four hundred thousand pound which , apparently , was the cheapest tender !
2 Captive-bred Pretty Tetras , have a much more brighter colouration than wild-caught specimens , the latter of which tend to lose this brightness over a period of time when kept in an aquarium .
3 This 11-year series combined with earlier observations of the pulsar gives us a fairly complete account of the rotational behaviour of this pulsar over a period of 23 years , including the glitches of 1969 , 1975 and 1986 ( refs 4–6 ) .
4 We have recently shown that significant portal and systemic endotoxaemia occurs in this model over a period of three weeks .
5 The first part of this investigation will assess the statistical evidence relating to this market over the period 1960-1989 concentrating on the aggregate relationship between teacher 's relative earnings , teacher supply and the demand for teachers .
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