نتایج جستجو برای: multicellular life
تعداد نتایج: 760686 فیلتر نتایج به سال:
Gene Regulatory Networks (GRNs) consisting of combinations of transcription factors (TFs) and their cis promoters are assumed to be sufficient to direct the development of organisms. Mutations in GRNs are assumed to be the primary drivers for the evolution of multicellular life. Here it is proven that neither of these assumptions is correct. They are inconsistent with fundamental principles of ...
The biology of Ediacaran organisms - the oldest fossils of large multicellular life - has been notoriously hard to decipher, as they show little obvious relation to extant life forms. Ecological analyses, rather than anatomy, yield new revelations about their reproduction.
We present a minimal model for the global carbon cycle of the Earth containing the reservoirs mantle, ocean floor, continental crust, biosphere, and the kerogen, as well as the combined ocean and atmosphere reservoir. The model is specified by introducing three different types of biosphere: procaryotes, eucaryotes, and complex multicellular life. During the entire existence of the biosphere pro...
Co-option of cis-regulatory modules has been suggested as a mechanism for the evolution of expression sites during development. However, the extent and mechanisms involved in mobilization of cis-regulatory modules remains elusive. To trace the history of non-coding elements, which may represent candidate ancestral cis-regulatory modules affirmed during chordate evolution, we have searched for c...
A study is made to learn how multicellular organisms might have emerged from singlecelled organisms. An understanding of this phenomenon might provide a better understanding of natural and man-made multicellular systems. The experiment performed is an Artificial Life simulation that uses Cartesian Genetic Programming to evolve the behaviors of individual cells. Cells have the ability to sense c...
The origin of multicellular organisms and the mechanism of development in cell societies are studied by choosing a model with intracellular biochemical dynamics allowing for oscillations, cell-cell interaction through diffusive chemicals on a two-dimensional grid, and state-dependent cell adhesion. Cells differentiate due to a dynamical instability, as described by our "isologous diversificatio...
Specialized cells are the essence of complex multicellular life. Fossils allow us to study the modification of specialized, multicellular features such as jaws, scales, and muscular appendages. But it is still unclear what organismal properties contributed to the transition from undifferentiated organisms, which contain only a single cell type, to multicellular organisms with specialized cells....
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