cytoplasmic streaming

Biological terminology

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stay Living cell Medium, cytoplasm It flows in various ways, including cytoplasmic circulation, shuttle flow and Brownian motion Wait, these are the same Microfilament and microtrabecular system The existence of is closely related.

Chinese name: cytoplasmic streaming

Properties: Flow of living cell cytoplasm
Content: Cytoplasmic circulation, shuttle flow and brownian motion

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Cytoplasmic circulation

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It is a form of cytoplasmic flow. stay vacuole Developed plants (such as black algae 、 Charophyta 、 Elodea ）In cells, the cytoplasm runs along the cell membrane Circulate at a certain speed and direction. This continuous circulation is called cytoplasmic circulation. The velocity of circulation, Elodea Yes 10 μm /s. Charophytes is 50 μ m/s. ordinary plant cell It is several microns to tens of microns per second.

Shuttle flow

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Shuttle flow is another form of cytoplasmic flow, which is different from the circulation and shuttles back and forth in the opposite direction. Because the flow direction changes back and forth within a certain time, it is called shuttle flow. Physarum spp. is the best material for studying this flow. It is a kind of Slime mold , Yes Multi-core There is no cell division in the cytoplasmic mass. The outer edge of the slime mold is the gel like outer substance, and the core is the sol like inner substance. There are many vein like minute branches in the inner and outer cytoplasm, which gather together in the center to form the main vein, and the cytoplasm flows from the branch vein to the main vein (Fig. 2-5, 1, 2). The flow rate of endoplasm is very fast, 1.3 mm/s, which is much faster than the cytoplasmic circulation. In this way, the volume of one end of the fungus shrinks, and the other end increases, forming pseudopodial protuberances. The fungus stops flowing temporarily (Fig. 2-5, 3), and then starts to reverse flow (Fig. 2-5, 4, 5), shuttling back and forth.

Brownian motion

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In living cells, many small particles in the cytoplasm are beating irregularly Dark field microscope The lower observation is more obvious, called Brownian motion. Brownian motion is not only related to the existence of microfilaments, but also related to the contraction of the micro beam grid.

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