Αποτελέσματα Αναζήτησης
7 Φεβ 2019 · MIT biologists have discovered why cell sizes are so tightly regulated. Researchers led by Angelika Amon found that the need to produce just the right amount of protein is behind the striking uniformity of sizes.
31 Οκτ 2023 · At 0.1 to 5.0 μm in diameter, prokaryotic cells are significantly smaller than eukaryotic cells, which have diameters ranging from 10 to 100 μm. The small size of prokaryotes allows ions and organic molecules that enter them to quickly diffuse to other parts of the cell.
18 Δεκ 2016 · Cells fall within specific limits, based on the surface-area-to-volume ratio, due to specific constraints of the cell membrane and the functions of the cell itself. Plus, this section looks at how organisms manipulate cell size and shape to create various functions and complete difficult tasks!
1 Οκτ 2024 · If cells are the main structural and functional unit of an organism, why are they so small? And why are there no organisms with huge cells? The answers to these questions lie in a cell's need for fast, easy food.
18 Μαρ 2019 · When mitosis (cell division) begins, cells change from flat to spherical. Experiments that confined dividing cells inside microscopic channels, restricting their dimensions, revealed that the spherical stage is essential for chromosomes to be distributed equally among daughter cells.
26 Μαρ 2018 · In multicellular tissues, cell shape emerges as an important means to transduce tissue-inherent chemical and mechanical cues into intracellular organization. One emergent paradigm is that cell-shape sensing is most often based upon mechanisms of self-organization, rather than determinism.
Why are cells, the basic units of life, so small? The answer lies in the relationship between a cell’s surface area and its volume. Surface area is the amount of surface an object has. For a cube, the formula for area is (length of a side) 2 x 6. For a sphere, the formula for area is 4 Π r 2. Volume is the amount of space inside something.
