Chez les mutants biochimiques le blocage des synthèses de métabolites influe peu sur la morphogenèse du mycélium jeune des champignons. Une lésion biochimique se traduit comme les carences du milieu par une exagération des corrélations d'inhibition. L'étude des mutants morphologiques pose le problème des rapports entre le noyau ct le cytoplasme. Ce dernier semble responsable de la mise en place des structures morphogènes.Summary. -In the biochemical mutants of fungi, the blocking up of metabolite synthesis have little influence on morphogenesis of young mycelium. A biochemical mutation is expressed, in the same manner as medium carences, by an increase of correlative inhibition. The study of morphological mutants sets the problem of the cxisting relations between the nucleus and the cytoplasm. That last one seems responsible for the selling in place of morphogenous structures.
A good parallelism exists between bacterial enumeration on an agar medium and the pool quantity determination of adenylic nucleotides . The energetic charge is an important parameter to evaluate the metabolic activity of microorganisms . After microscopic verification, it has been shown that different filtrations allow to separate and to count the various populations (phytoplankton, zooplankton, bacteria) by means of ATP content. The development cycle of microorganisms in a lake has been followed . Primary production of the micro-biomass is easily calculated by the variation of ATP content .
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