8 results filtered with: Digital Images
- Digital Images
- Online
Cytoplasmic polyhedrosis virus (CPV) or Cypovirus, is from the Rheoviridae family. It has a double stranded RNA genome and a very stable capsid. It infects insects, including silkworms, and can have an economic impact on the silk industry.
Jonathan Grimes, University of Oxford- Digital Images
- Online
Nepal; agriculture and subsistence in the Khumbu, 1986. Sherpa with young yak. The economic emphasis of the Khumbu is on animal husbandry, and the breeding and tending of yaks and cattle was an important occupation when this photograph was taken. Yaks command a good price. On walled, flat terraces, Sherpas cultivate their staple diet of potatoes, barley, buckwheat, and in lower areas, rice. In this picture, taken at altitude 2900 metres, the land sustains the commercial cultivation of medicinal herbs although increases in production are limited by environmental degradation, largely through soil erosion.
Carole Reeves- Digital Images
- Online
AIDS prevention advert from Vietnam
- Digital Images
- Online
Taxus baccata L. Taxaceae European Yew. Trees are feminine in Latin, so while Taxus has a masculine ending (-us), its specific name, baccata (meaning 'having fleshy berries' (Stearn, 1994)), agrees with it in gender by having a female ending ( -a). Distribution: Europe. Although regarded as poisonous since Theophrastus, Gerard and his school friends used to eat the red berries (they are technically called 'arils') without harm. Johnson clearly ate the fleshy arils and spat out the seed, which is as poisonous as the leaves. It is a source of taxol, an important chemotherapeutic agent for breast and other cancers. It was first extracted from the bark of T. brevifolia, the Pacific yew tree, in 1966. About 1,100 kg of bark produces 10 g of taxol, and 360,000 trees a year would have been required for the needs of the USA – an unsustainable amount. In 1990 a precursor of taxol was extracted from the needles of the European yew so saving the Pacific trees. It is now produced in fermentation tanks from cell cultures of Taxus. Curiously, there is a fungus, Nodulisporium sylviforme, which lives on the yew tree, that also produces taxol. Because taxol stops cell division, it is also used in the stents that are inserted to keep coronary arteries open. Here it inhibits – in a different way, but like anti-fouling paint on the bottom of ships – the overgrowth of endothelial cells that would otherwise eventually block the tube. The economic costs of anticancer drugs are significant. Paclitaxel ‘Taxol’ for breast cancer costs (2012) £246 every 3 weeks
Dr Henry Oakeley- Digital Images
- Online
Salmon sea louse mouth, fish parasite
Kevin Mackenzie, University of Aberdeen- Digital Images
- Online
Salmon sea louse, fish parasite
Kevin Mackenzie, University of Aberdeen- Digital Images
- Online
Nepal; children of the Terai, Rapti Valley, 1986
Carole Reeves- Digital Images
- Online
Catalogue of surgical instruments. Arnold and Sons, 1885