نتایج جستجو برای: silicification
تعداد نتایج: 299 فیلتر نتایج به سال:
Diatoms are the single most important drivers of the oceanic silicon biogeochemical cycle. Due to their considerable promise in nanotechnology, there is tremendous interest in understanding the mechanism by which they produce their intricately and ornately decorated silica-based cell wall. Although specific proteins have been implicated in some of the key steps of silicification, the exact mech...
Diatom frustules (the hard and porous cell wall of diatoms) are created under the control of biomolecules (silaffins, silacidins, and long-chain polyamines) at close to physiologic conditions. The mechanism of biosilica formation was traditionally based on the ability of zwitterionic water-soluble proteins to create macromolecular assemblies for silica polymerization. Recent discoveries of wate...
Calcified cartilage is a vertebrate tissue that has unique characteristics, such as high percentage of calcification, avascularity and cells with apparently delayed autolytic processes after death. All these factors suggest fossilized may be favorable to exceptional cellular preservation, but little known about chondrocyte fossilization overall in paleontology. To further understand the spectru...
a high percentage of world copper production is obtained from porphyry copper reserves, these reserves are characterized by: very high tonnage, greater horizontal dimensions than vertical, association with stock like intrusion masses, dispersed minerals in the porphyry mass and in its neighbor rocks, intense sericitization and inplace silicification. the porphyry coppers are concentrated by flo...
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