JMDMT #912 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection -ribs. The presence of the centripetal ribs are of particular interest regarding the argument of Fitch and Anders about pollen grains. The exo-exine of pollen grains show centrifugal thickenings but they never show centripetal ribs. Fames and MacDaniels (1947) state on p. 49 in their "Introduction to Plant Anatomy" that: "The external wall layers and surface projections of spores and pollen grains are formed in part by tapetal fluid or mother cell cytoplasm." (There- fore, only centrifugal thickenings can occur on walls of pollen grains.) It seems unlikely, that the particles shown in figure 10, a and 6, are pollen grains or spores. It is known that spores of fungi do not fluoresce. Hofler and Pecksieder write (1942, p. 117): "Angesichts der weiten Verbreitung
Added: Nov 21, 2008; Author: h4ck3rm1k3; Duration: 1:10; Views: 5