Sentence examples for been observed since from inspiring English sources

In our field observations, seedling recruitment has not been observed since 1995.

Spontaneous electrodermal responses (EDRs) during sleep, or sleep storms, have been observed since the 1960s.

Declines in black duck populations have been observed since the 1960's.

Surgery-induced acceleration of tumour growth has been observed since several centuries.

The tides of the Atlantic Ocean have been observed since ancient times.

The correlation between unemployment and suicide has been observed since the 19th century.

Although the legal obligation to tackle campus radicalisation took effect this week, in practice it has been observed since the law was outlined in March.

While drug resistance has been observed since the earliest chemotherapeutic application, relatively little is known about the genetics of drug response.

Earthquakes have been observed since 1982, and continuous observation by GNSS started in 2003.

The group has been observed since 1978 and has been the subject of intensive behavioral observation since mid-1992.

Recent reports have indicated that six of the warmest ten years on the records have been observed since 1990.