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Endospora (spora)

Endospora (spora). Cellula quiescente Si forma quando le condizioni diventano inadatte alla replicazione Resiste per tempi indefiniti La vitalità resiste a trattamenti con: - alte temperature - solventi organici Contiene dipicolinato di Calcio Bacillus and Clostridium.

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Endospora (spora)

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  1. Endospora (spora) • Cellula quiescente • Si forma quando le condizioni diventano inadatte alla replicazione • Resiste per tempi indefiniti • La vitalità resiste a trattamenti con: • - alte temperature • - solventi organici • Contiene dipicolinato di Calcio • Bacillus and Clostridium

  2. La spora battericaè una cellula, non una sua struttura • Citoplasma povero di acqua • Dipicolinato di Calcio • Rivestimenti costituiti da proteine ricche in legami disulfidrici

  3. La spora batterica • Forma di resistenza • temperature estreme • agenti chimico-fisici di disinfezione • mancanza di acqua • Metabolicamente inattiva • Differenziazione della cellula batterica • Caratteristica di alcuni generi • Bacillus, Clostridium • Non legata alla replicazione batterica • cellula vegetativa  spora  cellula vegetativa • è agente di infezione in quanto riesce a germinare

  4. Cortex Sporale • Spesso strato di mureina modificata • Forma lattamica dell’acido N-acetil muramico • La propaggine lactilica non è disponibile per l’attacco della quota peptidica • Minor numero di legami trasversi • Grande sensibilità all’idrolisi da lisozima [veloce, nel momento della germinazione]

  5. Tappe della sporificazione

  6. Sporogenesi

  7. Colorazione differenziale

  8. Resistenza ad agenti chimici di disinfezioneSpora batterica >micobatteri > virus nudi > funghi > cell vegetativa batterica > virus con envelope

  9. Volume 3 Bacterial Infections / 40 Anthrax / 3 Persistence in the environment The ability of B. anthracis spores to survive in the environment for long periods is the subject of frequent observations in the literature, but there are actually few well documented studies of this. Jacotot and Virat (1954) found that anthrax spores prepared by Pasteur in 1888 were still viable 68 years later. On the other hand, canvas squares heavily inoculated in 1907 with spores and stored in a laboratory cupboard had become sterile 22 years later (Graham-Smith 1930). The survival of anthrax spores in dry soil held in the laboratory for 60 years was noted by Wilson and Russell (1964). On Gruinard Island, off the coast of Scotland, the soil was still heavily contaminated >40 years after bombs containing B. anthracis spores were detonated there in 1942-43 (Manchee et al. 1994). Bones recovered during archaeological excavations at Parfuri in the Kruger National Park in 1970 and estimated by carbon dating to be 200 ± 50 years old, are reported to have yielded B. anthracis on culture (de Vos et al. 1990). We recently isolated B. anthracis from roof insulation material in London's Kings Cross Station which presumably dated from the construction of that building some 110 years ago. Similarly, we have recently been involved in a land contamination problem in a field in the west of England resulting from the burial of the carcass of a bullock that died of anthrax and was buried there some 50 years ago.

  10. La decontaminazione è costosa Vedi in nota i casi di contaminazione ambientale da spore carbonchiose da pelli o da tamburi africani Peaceof mind can beexpensive Presentazione sul campionamento e decontaminazione [altrui]

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