Grain organization

Fine Mineral Spent Grain Organic Chemical Chicken Droppings Fine Coal Filtar Cake... 

The diffusion path is often altered by the presence of solid boundaries. For example, in the subsurface organic chemicals must diffuse around soil and sediment grains. Within soil and sediment grains, organic chemicals must diffuse inside narrow and possibly undulating pores. To account for these effects the effective diffusion coefficient is modified by a restrictivity factor, Kr [-], and a tortuosity factor, r [-], as follows ... 

Small quantities of thiamin are present in almost all foods of plant and animal origin. Good sources are whole cereal grains organ meats such as liver, heart, and kidney lean pork eggs nuts and potatoes (Table 9-16). Although thiamin content is usually mea-... 

All samples consisted of fine-grained, organic matter-rich sediments from areas of known PCB contamination. 

Fig. 5.8 Temperature regulation of bacterial sulfate reduction in different marine sediments. The data show the rates of sulfate reduction in a homogenized sample from the upper few tens of cm of sediment measured by shortterm incubations in a temperature gradient block with radiolabelled sulfate as a tracer. A) Arctic sediment from 175 m depth in Storfjorden on Svalbard at 78°N where the in situ temperature was -1.7°C. (Data from Sagemann et al. 1998). B) Hydrothermal sediment from the Guaymas Basin, Gulf of California, at 2000 m depth. The hydrothermal fluid here seeps up through fine-grained, organic-matter rich sediment which was collected at 12-18 cm depth where the in situ temperature was 54-71°C. (Data from Weber and Jorgensen 2002).

Source rock Fine-grained organic-rich sediment capable of generating petroleum. 

Keywords Atomistic Coarse-graining Organic semiconductors Molecular dynamics Monte Carlo Molecular mechanics Force field Gay-Beme Liquid crystals Timescales Polymers... 

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