Ilmenite Exsolution
Ilmenite Exsolution - Related Videos
02:55
The Evidence for Evolution
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2026
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
01:54
Convergent Evolution
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2026
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
12:02
Molecular Evolution of the Tre Recombinase
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Cited by 4 •
2008
Here we report the generation of Tre recombinase through directed, molecular evolution. Tre recombinase recognizes a pre-defined target sequence within the LTR sequences of the HIV-1 provirus, resulting in the excision and eradication of the provirus from infected human cells. While still in its infancy, directed molecular evolution will allow the creation of custom enzymes that will serve as tools of molecular surgery and molecular medicine.
08:11
Adaptation at the Extremes of Life: Experimental Evolution with the Extremophile Archaeon Sulfolobus acidocaldarius
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2024
Here, we present an experimental evolution protocol for adaptation in thermophiles utilizing low-cost, energy-efficient bench-top thermomixers as incubators. The technique is demonstrated through the characterization of temperature adaptation in Sulfolobus acidocaldarius, an archaeon with an optimal growth temperature of 75 °C.
02:31
Synteny and Evolution
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2021
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species. Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
FAQs
Atomic diffusion allows iron, titanium, and related components to redistribute while the crystal adjusts to changing conditions. As cooling lowers the solubility of the original solid solution, diffusion separates material into compositionally distinct regions rather than preserving a uniform structure. The resulting intergrowth records how effectively atoms moved before the mineral became relatively stable.
Lamellae preserve the pathway by which a mineral responded to cooling and changing oxygen conditions. Their presence and arrangement connect mineral texture with the temperature and redox environment experienced during formation or subsequent alteration. Consequently, these intergrowths provide a mineral-scale record that can support reconstruction of igneous and metamorphic rock histories.
Composition determines which components are available to partition, while oxygen conditions influence the stability of iron-bearing phases. When temperature or redox conditions change, the original solid solution may no longer remain energetically or chemically uniform. The resulting separation into ilmenite-rich and iron-oxide-rich regions therefore reflects both bulk composition and the surrounding chemical environment.
Interpretation begins by examining the intergrowth form, including fine lamellae or other relationships between the iron- and titanium-bearing phases. Researchers then relate those textures to changing temperature, composition, and oxygen conditions, distinguishing evidence of formation from later alteration where possible. This approach converts mineral structure into clues about the rock’s thermal and redox history.
The textures are useful when reconstructing the formation and alteration of igneous and metamorphic rocks, and when assessing iron and titanium mineral behavior. They also help interpret magnetic and geochemical signals in sediments and weathered materials. This broad relevance connects mineral-scale phase separation with the environmental history recorded by rocks, sediment, and alteration products.
The stability of the separated phases helps researchers consider how iron- and titanium-bearing minerals respond during weathering and over long time periods. Textural evidence can indicate how these minerals formed before alteration and provide context for their later behavior. Such information supports studies of the long-term cycling of iron and titanium through weathered materials and related environments.