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Images Dated 24th August 1999

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Choose from 6 pictures in our Images Dated 24th August 1999 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.

Coloured TEM of nuclear polyhedrosis viruses
Science Photo Library

Coloured SEM of a weevils head
Science Photo Library

Stenotrophomonas sp. bacteria
Science Photo Library

Upside-down Jellyfish (Cassiopea xamahana) swimming by, pulsating disc
Animals Animals

Fer-De-Lance (Bothrops asper), venomous, swallowing Rainfrog, Costa Rica
Animals Animals

Yosemite Valley, Yosemite NP, CA
Animals Animals

Featured 24 Aug 1999 Print

Coloured TEM of nuclear polyhedrosis viruses

Nuclear polyhedrosis viruses. Coloured transmiss- ion electron micrograph (TEM) of nuclear polyhedrosis insect viruses. The viruses have an envelope (blue) which may contain several virus particles. After being eaten by an insect, they infect the cells lining the insect's gut, before spreading to the rest of its body and killing it. Inside the nuclei of the insect's cells, they form structures which are eaten by other insects, continuing their life-cycle. These viruses have been used as a means of biologically controlling insect pests, as they are not pathogenic in other organisms. Magnification unknown