Catalogue
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Illustration of the DNA double helix. The sugar-phosphate backbone of the two complementary strands are visible (red and blue).
Susan Lockhart- Digital Images
- Online
Separation of DNA fragments by electrophoresis through an agarose gel. An electric current is passed through the gel and separates the DNA fragments according to size. The mixture of fragments is applied to a well at the top of the gel before the current is started. The smaller fragments travel further and reach the bottom of the gel while the larger ones remain towards the origin.
Guy Tear- Digital Images
- Online
Separation of DNA fragments by electrophoresis through an agarose gel. An electric current is passed through the gel and separates the DNA fragments according to size. The mixture of fragments is applied to a well at the top of the gel before the current is started. The smaller fragments travel further and reach the bottom of the gel while the larger ones remain towards the origin.
Guy Tear- Digital Images
- Online
Separation of DNA fragments by electrophoresis through an agarose gel. An electric current is passed through the gel and separates the DNA fragments according to size. The mixture of fragments is applied to a well at the top of the gel before the current is started. The smaller fragments travel further and reach the bottom of the gel while the larger ones remain towards the origin.
Guy Tear- Digital Images
- Online
Cynoglossum officinale L. Boraginaceae. Houndstongue. Distribution: Europe. Culpeper (1650) writes: “... being roasted and laid to the fundament, helps the haemorrhoids. It is also good against burnings and scaldings.” It contains hepatocarcinogenic pyrrolizidine alkaloids and while people are known to eat the young leaves as a vegetable, this is inadvisable. The whole plant is hairy and may cause contact dermatitis. The use of herbal remedies, which contain these alkaloids, by the Bantu of southern Africa correlates with their high incidence of tumours of the liver and pancreas. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
Dr Henry Oakeley