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Abstract
Se aislan una serie de microorganismos capaces de desarrollarse en un medio defidente de fósforo (medio P) observándose conjuntamente con la característica de crecer perfectamente una morfología un tanto particular (formas alargadas, a veces con varías granulaciones en el interior) y originando formas quísticas. Bacterias de la colección del laboratorio (38 cepas se sembraron en el medio mencionado) apreciándose que el Azotobacter crecía muy bien y observándose en Az chrococcum una pigmentación negra, mucho más oscura que la clásica pigmentación marrón que se produce en medios desprovistos de nitrógeno.
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