Effets des rayons U.V. sur Acetabularia mediterranea

The Membrane Potential of Acetabularia mediterranea

The cytoplasm of an Acetabularia cell is normally at a potential of about -170 mv relative to the external solution; the vacuole is also at this potential. Although there is strict flux equilibrium for all ions, the potential is more negative than the Nernst potentials of any of the permeating ions. Darkness, CCCP, low temperature, and reducing [Cl(-)](o) by a factor of 25 all rapidly depolariz...

Modélisation par éléments finis des effets des médicaments sur le remodelage osseux : Approche mécanobiologique

quelques reflexions sur la notion des effets de commerce

-

Nucleic acid synthesis in the chloroplasts of Acetabularia mediterranea.

Radioautographic and radiochemical techniques were used to establish the presence of replicating DNA in the chloroplasts of Acetabularia mediterranea. These techniques also demonstrated that these chloroplasts synthesize RNA. It was found that label from thymine was also incorporated into DNA and RNA in these chloroplasts. With the establishment of protein and nucleic acid synthesis in Acetabul...

Morphology of nucleolar cistrons in a plant cell, Acetabularia mediterranea.

The structural organization of transcriptionally active DNA that contains cistrons for precursor molecules of ribosomal RNA is described in positively stained spread preparations from nuclei and nucleoli isolated from the green alga, Acetabularia mediterranea Lmx. These nuclei contain large aggregates of nucleolar subunits in which fibril-covered regions, the putative active cistrons for precur...