File:Pietro Marchi (1864) - Diagnosi del seme (uova) del baco da seta.jpg

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Italiano: Preparati microscopici di uova (semi) di baco da seta, allestiti dallo zoologo Pietro Marchi (1833-1923) nel 1864.

A sinistra un uovo sano: nel campo sono visibili le sferule tondeggianti (A), formate dalla normale materia grassa del tuorlo. A destra un uovo deposto da una femmina affetta da atrofia parassitaria (pedrina o mal delle petecchie): assieme alle sferule tondeggianti di materia grassa sono visibili i corpuscoli oscillanti di Cornalia (B), sintomo patognomonico dell’infezione e segno certo per la diagnosi di seme infetto. I corpuscoli oscillanti, così detti perché dotati di un movimento oscillatorio, furono osservati per la prima volta da Carlo Vittadini e descritti da Emilio Cornalia.

Come fu riconosciuto in seguito, sono le microspore del protozoo ciliato Nosema bombycis Näegely, 1857 (Mixozoo Microsporide Nosematide) l’endoparassita patogeno, specifico incondizionato, responsabile dell’atrofia parassitaria del baco da seta.
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Source Immagine tratta da: Pietro Marchi, Della dominante malattia dei bachi da seta, dell'esame microscopico delle uova, e del suo più giusto valore. Cenni del dott. Pietro Marchi, in Giornale Agrario Toscano, XI (n.s.), Firenze, Gabinetto Scientifico Letterario di G. P. Vieusseux, p. 27, fig. III e IV.
Author Pietro Marchi (1833-1923)

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current17:48, 24 July 2022Thumbnail for version as of 17:48, 24 July 20221,818 × 731 (260 KB)Giwiller (talk | contribs)
17:44, 24 July 2022Thumbnail for version as of 17:44, 24 July 20221,818 × 731 (271 KB)Giwiller (talk | contribs)
21:55, 13 July 2022Thumbnail for version as of 21:55, 13 July 20221,818 × 731 (280 KB)Giwiller (talk | contribs){{Informazioni file |Descrizione = Preparati microscopici di uova (seme) di baco da seta. A destra un uovo sano: nel campo sono visibili le sferule tondeggianti (A), formate dalla normale materia grassa del tuorlo. A sinistra un uovo deposto da una femmina affetta da atrofia parassitaria (pedrina o mal delle petecchie): assieme alle sferule tondeggianti di materia grassa sono visibili i corpuscoli oscillanti di Cornalia (B), sintomo patognomonico dell’infezione e segno certo per la diagnosi d...

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