migrated from stackoverflow.com Jun 20 '10 at 3:23. 1  Excel is a spreadsheet application that saves files into its own format while CSV is a standard of saving tabular information into a delimited text file. 2  CSV is a very old method of saving tables compared to Excel.
Authigenic sediment, deep-sea sediment that has been formed in place on the seafloor. The most significant authigenic sediments in modern ocean basins are metal-rich sediments and manganese nodules.
1. Manganese (Mn) is an essential trace element that is found in varying amounts in all tissues. Manganese concentrations are highest in tissues rich in mitochondria, where it forms stable complexes with ATP and inorganic phosphate. Manganese functions as a constituent of metalloenzymes and an activator of enzymes. key neurochemical alteration associated with manganese neurotoxicity is altered extracellular glutamate levels. Attenuated glutamate uptake by astrocytes has been invoked as the primary cause for this disturbance (Hazell and Norenberg, 1997 and Erikson and Aschner, 2002).