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  • Marker for the grave of children. Oil painting on wrought iron.
  • Marker for the grave of children. Oil painting on wrought iron.
  • Marker for the grave of children. Oil painting on wrought iron.
  • Marker for the grave of children. Oil painting on wrought iron.
  • Marker for the grave of children. Oil painting on wrought iron.
  • Marker for the grave of children. Oil painting on wrought iron.
  • Oestrus detection: chin-ball marker
  • Marker for the grave of children. Wrought iron with oil painting by an Austrian (?) painter.
  • The Marmite book marker / with the compliments of the Marmite Food Extract Co. Ltd.
  • The Marmite book marker / with the compliments of the Marmite Food Extract Co. Ltd.
  • Solanum laciniatum Aiton Solanaceae. Kangaroo Apple. Evergreen shrub. Distribution: New Zealand and the east coast of Australia. It contains steroidal saponins that can be converted into steroids, including progesterone, oestrogens, cortisone, prednisolone etc. In 1943, Professor Russell Marker discovered a method of obtaining an unsaturated steroidal saponine, diosogenin, from Mexican yam (Dioscorea mexicana), which can easily and cheaply be converted into steroids, such as prednisone and progesterone, reducing the price of steroid production to a fraction (0.5%) of its former cost. For 20 years drug companies showed little interest, and it was only as a result of Professor Marker forming his own company, and the concerted efforts of several gynaecologists, physiologists and birth-control advocates, that the contraceptive pill was ‘born’ in 1960. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • A square with the message "Le SIDA ... a vue d'oeil on voit rien!" [AIDS ... has eyes - we see nothing!] in black marker pen on a squared background; one of a series of posters representing an advertisement for a competition for posters of images against AIDS organised by CRIPS. Lithograph by Noëlle Ciccodicola.
  • Human neural stem cells stained for nestin (red). Nestin is a type of intermediate filamant protein that is used as a marker of neural stem cells. The blue dots are the cell nuclei stained with DAPI. Neural stem cells can be made to develop into cells found in the central nervous system; neurons, astrocytes and oligodendrocytes.
  • Saint Mark. Engraving.
  • Saint Mark. Engraving.
  • Saint Mark. Engraving.
  • Saint Mark. Etching.
  • Saint Mark. Engraving.
  • Mark Akenside. Etching.
  • Saint Mark. Etching.
  • Saint Mark. Stipple engraving.
  • Mark Ridley. Line engraving.
  • Mark Ridley. Line engraving.
  • Mark Akenside. Line engraving.
  • Mark Akenside. Line engraving.
  • Mark Frederick Boyd. Photograph.
  • Saint Mark. Stipple engraving.
  • Weights and measures: marks only
  • Peter Mark Roget. Pencil drawing.
  • Helen Keller with Mark Twain.