51.7 MB (1.4 MB compressed)
4781 x 3780 pixels
40.4 x 32.0 cm ⏐ 15.9 x 12.6 in (300dpi)
JAMES HOLMES / OXFORD CENTRE FOR MOLECULAR SCIENCES / SCIENCE PHOTO LIBRARY JAMES HOLMES / OXFORD CENTRE FOR MOLECULAR SCIENCES / SCIENCE PHOTO LIBRARY
Mass spectrum of the enzyme DS lysozyme, displayed on the computer screen of a VG BIO-Q mass spectrometer used for protein analysis at Oxford University. Mass spectrometers are used to identify chemical compounds by exploiting the behaviour of their molecular ions in magnetic & electric fields. Samples in liquid form are injected into the machine in background. Inside, the substance is ionised by bombardment from high- energy electrons. Variable electric and magnetic fields are used to accelerate & deflect the ions towards a detector.
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