(2721) Proposal to conserve the name Chara flexilis ( Nitella flexilis ) ( Characeae ) with a conserved type
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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...
متن کاملDifferent cytoplasmic calcium contents among three species of Characeae.
Internodal cells of three species of Characeae, Nitella flexilis, Nitella axilliformis and Chara corallina, were analyzed for the contents of Ca(2+ )and Mg(2+) in the cytoplasm. To avoid contamination of Ca(2+) from the cell wall and vacuole, the vacuolar sap was replaced with a sorbitol solution containing Sr(2+) by the vacuolar perfusion method after the cell had been treated with Sr(2+). No ...
متن کاملHydrostatic Pressure and Temperature in Relation to Stimulation and Cyclosis in Nitella Flexilis
Nitella flexilis cells are not stimulated to "shock stoppage" of cyclosis by suddenly evacuating the air over the water or on sudden readmission of air, or on suddenly striking a piston in the water-filled chamber in which they are kept with a ball whose energy is 7.6 joules, provided the Nitella cell is not moved by currents against the side of the chamber. Sudden increases in hydrostatic pres...
متن کاملProton-Metal Cation Exchange in the Cell Wall of Nitella flexilis.
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 کاملPregnane-Type Steroids from the Formosan Soft Coral Scleronephthya flexilis
Three pregnane-type steroids, including a new metabolite, 3β-methoxy-5,20-pregnadiene (1) along with two known analogues, 3β-acetoxy-5,20-pregnadiene (2) and 5α-pregna-1,20-dien-3-one (3) were isolated from the soft coral Scleronephthya flexilis. Standard spectroscopic techniques were used to determine the structure of new steroid 1. The absolute stereochemistry of steroid 2 was confirmed by X-...
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ژورنال
عنوان ژورنال: TAXON
سال: 2019
ISSN: 0040-0262,1996-8175
DOI: 10.1002/tax.12165