Hans Christian Joachim Gram,Danish bacteriologist
Numéro d’image : 11828772
| Hans Gram. Portrait of Hans Christian Joachim Gram (1853-1938),Danish bacteriologist. In 1884 Gram invented a new staining technique. He discovered that some bacteria will retain an aniline-gentian violet after treatment with iodine solution and ethanol; others do not. The former are said to be Gram-positive,the latter are Gram-negative and the difference is due to the chemical structure of their membranes. The test is still important in the identification and classification of bacteria; penicillin will not attack Gram-negative microbes. Gram took up a clinical career and was appointed Professor of Medicine at Copenhagen in 1900 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library |
| Taille de l’image : | 3560 px × 4983 px |
| Model Release : | Le droit n'est pas encore disponible. Merci de nous contacter avant utilisation. |
| Property Release : | Non requis |
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