Example sentences of "period [prep] about " in BNC.
Next page| No | Sentence |
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| 1 | The human brain , particularly memory , works best for concentrated periods of about forty to fifty minutes . |
| 2 | The first REM sleep period is usually shorter than the subsequent ones — about fifteen minutes in adults , as against later periods of about half an hour . |
| 3 | Altogether , tutorials take place over a period of about twenty-four weeks in the last year of a course , and usually by the last twelve tutorials a student has a much clearer idea of what he or she is about . |
| 4 | It is usual to hire a new vehicle on a fully maintained basis for a period of about three years . |
| 5 | And gradually , over a period of about nine months , she began to lose the use of her eyes . |
| 6 | The results showed that rhythms with a period of about 24 hours continued and this confirmed the activity of the body clock during the experiment ( fig 2.1 ) . |
| 7 | Evidence that the SCN are the body clock can be summarized as follow : ( 1 ) Rhythmic electrical activity can be recorded from the nerve cells that make up the SCN and this rhythm has a period of about 24 hours . |
| 8 | Some individuals , even when living in normal society , do not remain in synchrony with the 24-hour day and instead free-run with a period of about 25 hours . |
| 9 | In this case it shows a period of about 21 hours which is too rapid to be adjusted to a normal value of 24 hours . |
| 10 | The rebuilding of the old manor took place over a period of about five years and was probably finished in about 1727 . |
| 11 | The system was developed over a period of about 10 years and arrived on the market in three stages . |
| 12 | Thus , within a period of about 300 years , the Franks had developed from a general confederacy of Germanic invaders with mere tribal links , into a fully-fledged kingdom . |
| 13 | There followed a period of about fifteen years when creative genius became evident , such as the works of William Shakespeare ; Marlow ; Spencer and Ben Johnson . |
| 14 | Was the mountain flora once richer , for example during the late-glacial period of about 13,500 — 10,000 years ago when deglaciation was occurring and soils were more fertile ? |
| 15 | So a 20-storey building has a period of about 2 seconds , a natural frequency of 0.5 hertz ; a five-storey building has a period of half a second , a natural frequency of 2 hertz . |
| 16 | Again and again , users , after a period of about fifteen years , suddenly decide to leave . |
| 17 | On that assumption , Theunis Krankoor 's arrival in Cape Town can be placed within a period of about fifteen years , after the implementation of the full Napoleonic legal code in the Netherlands and before the birth of his first child , James , who , according to his wedding and death registrations , was born in the Cape Colony about 1823 or 1824 . |
| 18 | It is recommended that their training stretches over a period of about 15 months from the time that they take up their post . |
| 19 | The poor girl had gone off to her camp before she had formulated any hypotheses ; she had no idea as to what theory or concepts her work was to throw new light on , and so , to be on the safe side , she had recorded everything she could think of over a period of about six weeks and her notebooks practically filled a medium-sized suitcase . |
| 20 | They all had their pictures done and eventually over a period of about a year , she actually did a portrait of everybody in the Home . |
| 21 | CHESAPEAKE BAY Has created over a period of about 17000 years . |
| 22 | In that period of about sixteen months , the level of prices rose by approximately 7,500 m. times . |
| 23 | These workers reported the effects of various potencies of silver nitrate ( Argentum nitricum ) on the growth of wheat seedlings which gave reproducible results over an experimental period of about a year . |
| 24 | Over a period of about a year he was regressed six times at regular intervals . |
| 25 | JEB Fasteners had purchased all the shares in a private company having relied on its accounts for a period of about a year since incorporation . |
| 26 | The results of the pilot programme ( based on the ability of the mothers to recall what they had been taught two weeks previously ) were so promising that BRAC launched a programme to teach the method of preparing LGS to every household in the country over a period of about ten years . |
| 27 | In some cases there are definite indications of periodicity ; thus Beta Pegasi , in the Flying Horse , has a period of about 36 days , though the range is less than half a magnitude . |
| 28 | It has been said that there is a period of about 5½ years , but it is very vague indeed . |
| 29 | There is said to be a rough period of about 100 days , but I have never been able to confirm this . |
| 30 | The range is from 6.8 to 9.1 , and there is a rough period of about 198 days . |