False-colour scanning electron micrograph of Chlamydia psittaci,a species of small,spherical bacteria causing abortion & lung disease (psitta- cosis) in humans. Chlamydia species are atypical bacteria which are obligate intracellular para- sites,reproducing only inside cells. The life- cycle has two stages; this image shows the infect- ious elementary bodies which are stable and about 250 nanometres across. Once inside a cell they undergo reorganisation to form a large,(400- 1000nm) non-infectious active stage. This stage divides by binary fission,ultimately pro- ducing new elementary bodies. Mag: x5,900 at 35mm | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Moredun Animal Health |
Taille de l’image : | 3684 px × 2558 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |