208 Marine Microbiology 



TABLE 2 

 Biochemical Analyses— Cariaco Trench Samples 



Depth Protein Carbohydrate Lipids (ppm) % 



Core (ft) (mg/g) (f^g/g) Free Bound Total bound 



~~ 31 552 5^6 



310 890 34.7 



227 936 21.9 



41 463 8.9 



168 913 18.4 



138 686 20.1 



78 171 45.6 



196 385 50.9 



All figures are on a dry weight basis. 



the samples from NT-2 were the lowest yet seen in our work, 

 and may approach the lower limits for heterotroph survival in 

 muds. The lipid increase was seen only in the Voldenfjord core 

 (NT-1) below eighteen feet. Data are not yet available on the 

 "bound" lipids in these cores. 



The absolute amount of any given fraction depends on the 

 environment of deposition, the source of the organic matter, 

 the geologic history of the sediment, and the age and depth of 

 burial of the sample. More detailed analyses (both chemical anc^ 



