Velocity distributions of the streaming protoplasm in Nitella flexilis
نویسندگان
چکیده
منابع مشابه
Protoplasmic Streaming of an Internodal Cell of Nitella Flexilis
The sudden cessation or sudden decrease in velocity of the protoplasmic streaming of Nitella flexilis is observed whenever an action potential is elicited. The action potential can be generated by an electric stimulus after its refractory period, whether the flow is at a complete standstill or on the way to recovery. The membrane potential is generally decreased more or less when the rate of fl...
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(a) Photosynthesis with protoplasm isolated from Chara or Nitella as measured by C(14) fixation has been obtained at a rate 12 to 15 per cent of that of the whole cells. (b) Photosynthesis by cut cells of Chara or Nitella with the vacuolar sap removed was at a rate comparable to that of the whole cells. (c) Both the protoplasm and the cut cells reduced CO(2) in the light to sucrose and hexose p...
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Cytoplasmic streaming (CPS) is well known to assist the movement of nutrients, organelles and genetic material by transporting all of the cytoplasmic contents of a cell. CPS is generated by motility organelles that are driven by motor proteins near a membrane surface, where the CPS has been found to have a flat velocity profile in the flow field according to the sliding theory. There is a consi...
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When protons are exchanging for bivalent cations (Cu(2+), Zn(2+), or Ca(2+)) on the carboxylic groups of Nitella flexilis cell wall, the values of the respective global equilibrium constants do not change up to a protonation degree of 80%. These values drastically increase at higher proton concentrations and tend to approximately 3.4, which is the intrinsic pK value of the constitutive alpha-d-...
متن کاملStudies on Living Protoplasm I. Streaming Movements in the Protoplasm of the Egg of Sabellaria Alveolata (l.)
IN recent years many attempts have been made to determine the absolute coefficient of viscosity of "protoplasm." The values for this constant obtained by different workers differ widely, and while it is probable that the protoplasm from different sources is never the same in its composition, and cannot be expected to be constant in its viscosity, many sources of error in such determinations hav...
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ژورنال
عنوان ژورنال: Biophysical Journal
سال: 1977
ISSN: 0006-3495
DOI: 10.1016/s0006-3495(77)85652-x