By Barry Doyle
Applies designated wisdom towards the layout and development of underground civil works initiatives. Develops severe talents for handling chance and designing trustworthy gasoline keep watch over measures inside venture time and value constraints.
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Extra resources for Hazardous Gases Underground: Applications to Tunnel Engineering (Civil and Environmental Engineering)
They may be generated by either biogenic or geochemical processes. Biogenic inorganic carbon compounds perform protective and supporting functions such as in shells, bones, and teeth. Calcium carbonate, for example, forms the supporting structures of plankton, frames of reef organisms, and shells. Geochemical processes generate abiogenic (not resulting from activity of living organisms) forms of inorganic carbon, such as the calcium carbonate ooliths that precipitate from seawater. Sediments consisting chiefly of inorganic carbon compounds, such as limestone, dolomite, and chalk, are called carbonates.
Organic Matter in Terrestrial Sediments Terrestrial environments are very unfavorable to incorporation of organic matter into sediments. Air and moisture promote rapid mineralization. Organic-rich terrestrial sediments are generally characterized by high water table and rapid burial; they include fluvial sediments, mires, organics incorporated into glacial drift, and landfills. The primary producers of organic matter are plants. The most important decomposers are aerobic and anaerobic bacteria, and fungi.
6. anaerobes use alternative metabolic processes that function with or without oxygen. These and related terms are summarized in Table 2-1. Prokaryotes, or bacteria, include aerobes and anaerobes. Most eukaryotes are obligate aerobes. PRODUCTION AND CONSUMPTION OF ORGANIC MATTER An organism’s source of carbon defines its relationship to other members of its biological community. Feeding relationships are described by a food web, as shown in Figure 2-2. The food web includes assimilatory and dissimilatory food chains.