Tropical rainforest areas

Kaolinite is widely used for electrokinetic laboratory experiments, but because of the low CEC or buffering capacity, the results are of no great practical value as kaolinite occurs in abundance only in soils that have been formed in hot moist climates, for example, in tropical rainforest areas. 

As was recently done for soil layers below forests in moderate climates (Franzle et al. 2007), it is feasible to analyze metal cycles in the biota in the thin-layer-humic/high-biomass-per-area regime of Amazonian tropical rainforest also. Generally speaking, the fates of chemical elements, including possible maxima in their bioaccumulation by plants or fungi, depend on the kinds or chemical states of ligands delivered by roots or mycelia or soil bacteria to the soil and subsequent chemical and biochemical alterations, which modify, create or remove chemical sites where they bind and retain various metal ions. These... 

The study area is situated in the tropical lowland rainforest between the Daintree River (145°26.36 E 16°17 S) and Cape Tribulation (145°27 E and 16°04.7 S) along the coast of north eastern Australia. 

U. tomentosa is a woody vine indigenous to the Amazonia rainforest and other tropical areas with hook-like thorns that resemble a cat s claw, hence the name. In 2008, Wawer et al. [51] reported a and CP-MAS NMR study of the oxindole alkaloids of U. tomentosa. The alkaloids for which data were reported included (30), isomitraphylline (31), pteropodine (uncarine C, 32), isopteropodine (uncarine E, 33), and speciophyUine... 

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