MARTIN DOHRN / IVF UNIT, CROMWELL HOSPITAL / SCIENCE PHOTO LIBRARY. MARTIN DOHRN / IVF UNIT, CROMWELL HOSPITAL / SCIENCE PHOTO LIBRARY.
In vitro fertilisation (IVF) technique performed at the IVF unit, Cromwell Hospital, London, showing technician examining a petri dish (containing the ova and sperm) through an optical microscope, (sperm is introduced through the pipette) to check for successful fertilisation. Initially, 2-3 ova are suspended in a liquid medium (the pink colour is due to an acid-base indicator - pH & temperature are critical): sperm (previously collected & stored in liquid nitrogen) is brought to ambient temp. To minimise contamination risk, IVF is performed in a ultra-clean area, ie a dust-free cabinet.
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