cytoplasmic streaming


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

streaming

 [strēm´ing]
the movement of a current in a fluid.
cytoplasmic streaming (protoplasmic streaming) cyclosis.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cytoplasmic streaming

or

cyclosis

the movement of cytoplasm from one region of a cell to another, often in definite currents, thought to be controlled by MICROFILAMENTS composed of protein similar to ACTIN. Such streaming has several possible functions:
  1. transport of substances from one part of the cell to another (e.g. during TRANSLOCATION in SIEVE TUBES);
  2. cellular movement (e.g. in PSEUDOPODIA of white blood cells);
  3. maintenance of optimal temperature;
  4. provision of optimal light conditions for chloroplasts (e.g. in MESOPHYLL cells of leaf).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
(2010) Calcium wave for cytoplasmic streaming of Physarum polycephalum.
He was appointed to a research associate of the same department and started studies on the cytoplasmic streaming of Physarum polycephalum.
The regulatory role of [Ca.sup.2+] in cytoplasmic streaming in a variety of plant tissues has been actively researched (Seagull, 1989), including some information available on root hairs.
Application of the ionophone A23187 leads to higher levels of cytosolic [Ca.sup.2+] in root hairs and a decrease in cytoplasmic streaming (Felle et al., 1992; Sattelmacher et al., 1993), supporting the concept that higher free cytosolic levels of [Ca.sup.2+] are inhibiting to cytoplasmic streaming.
If [Ca.sup.2+] is involved in cytoplasmic streaming, then other compounds known to influence this process may act through controlling [Ca.sup.++] levels.
Thus, Chara myosin must be a processive myosin with a long step size, and moves at the speed of cytoplasmic streaming of 30-50 [micro]m/s.
Further investigations with these cell-purified myosins provide us with useful evidences to understand physiology including regulatory mechanism on cytoplasmic streaming in the living plant cell.
Cytoplasmic streaming in the hexactinellid sponge Rhabdocalyptus dawsoni (Lambe 1873).
In eggs treated with both CCD and demecolcine, we saw no saltatory movement, no cytoplasmic streaming, and no movement of oil droplets toward the vegetal pole [ILLUSTRATION FOR FIGURE 1D OMITTED].
The inhibition of cytoplasmic streaming and formation of the blastodisc by CCD in medaka eggs is consistent with data obtained from other teleost eggs (Katow, 1983; Ivanenkov et al., 1987) and from eggs of other organisms, including ascidians (Sawada and Osanai, 1981; Jeffery, 1984) and an oligochaete (Shimizu, 1982).