نتایج جستجو برای: rock weathered
تعداد نتایج: 40360 فیلتر نتایج به سال:
Increased resistance of weathered cotton cellulose to microbial breakdown has been shown to be the result of development of resistance to the action of fungal cellulases. Photochemical activity during weathering exposure transforms the cellulose into an altered substrate that prevents access of the enzymes to susceptible sites of the cellulose molecule. It is postulated that the altered substra...
Polycyclic aromatic hydrocarbons (PAHs), derived largely from fossil fuels and their combustion, are pervasive contaminants in rivers, lakes, and nearshore marine habitats. Studies after the Exxon Valdez oil spill demonstrated that fish embryos exposed to low levels of PAHs in weathered crude oil develop a syndrome of edema and craniofacial and body axis defects. Although mechanisms leading to ...
This study investigated the hydrocarbonoclastic microbial community present on weathered crude oil and their ability to degrade weathered oil in seawater obtained from the Gulf St. Vincent (SA, Australia). Examination of the native seawater communities capable of utilizing hydrocarbon as the sole carbon source identified a maximum recovery of just 6.6 × 10 1 CFU/ml, with these values dramatical...
Soil samples were collected in six South American countries in a total of 71 different 1 ha forest plots across the Amazon Basin as part of the RAINFOR project. They were analysed for total and exchangeable cations, C, N, pH with various P fractions also determined. Physical properties were also examined and an index of soil physical quality proposed. A diverse range of soils was found. For the...
A detail geological investigation was carried out in order to explore white clay deposite at 10 square kilometer areas of Madhabpur and 0.5 Bahubal Upazilas Habiganj District Bangladesh using hand auger shallow drilling method. The whole surveyed area identified for deposits from qualitative as well quantitative aspect. These were marked depths 0.2 meter 8.0 below the surface. Average thickness...
Abstract Hard rocks or crystalline (i.e., plutonic and metamorphic rocks) constitute the basement of all continents, are particularly exposed at surface in large shields Africa, India, North South America, Australia Europe. They were, still some cases, to deep weathering processes. The storativity hydraulic conductivity hard rocks, thus their groundwater resources, controlled by these processes...
Several measurements of vertical ground motion at Pition Flat Observatory, California, indicate the overall weakness and instability of the Earth's weathered surface with respect to the underlying rock. Cumulative long-period motions of order 0.5 mm per year dominate these records, though smaller elastic deformations caused by precipitation loading, atmospheric loading, and tidal strains are ev...
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