Relative quantities of NifH in intact trichomes of C. raciborskii and Anabaena PCC7120 assayed by immunogold-TEM localization.

C. raciborskii and Anabaena PCC7120 grown in MLA0 were sampled 3 h after the start of the light phase of the 12L/12D cycle, and immunogold-TEM localization of the NifH protein was performed.*Values are means ± SD of a total of 23 cells (or different images for background label count) from 3 independent cultures. Background denotes the formvar covered areas on the TEM grids lacking cells (heterocysts and vegetative cells), the i.e. non-biological background.