“potassium”的概念、定义、翻译、参考文献-科学参考

potassium

Chemistry

A soft silvery metallic element belonging to group 1 (formerly IA) of the periodic table (see alkali metals); a.n. 19; r.a.m. 39.098; r.d. 0.86; m.p. 63.7°C; b.p. 774°C. The element occurs in seawater and in a number of minerals, such as sylvite (KCl), carnallite (KCl.MgCl₂.6H₂O), and kainite (MgSO₄.KCl.3H₂O). It is obtained by electrolysis. The metal has few uses but potassium salts are used for a wide range of applications. Potassium is an essential element for living organisms. The potassium ion, K⁺, is the most abundant cation in plant tissues, being absorbed through the roots and being used in such processes as protein synthesis. In animals the passage of potassium and sodium ions across the nerve-cell membrane is responsible for the changes of electrical potential that accompany the transmission of impulses. Chemically, it is highly reactive, resembling sodium in its behaviour and compounds. It also forms an orange-coloured superoxide, KO₂, which contains the O₂⁻ ion. Potassium was discovered by Sir Humphry Davy in 1807.
https://www.webelements.com/potassium/ Information from the WebElements site

Biology

Symbol K. A soft silvery metallic element that is an essential element for living organisms. The potassium ion, K⁺, is the most abundant cation in plant tissues, being absorbed through the roots and being used in such processes as protein synthesis. In animals the high intracellular concentration of K⁺ relative to the extracellular fluid is a key component in establishing the resting potential of neurons, and is maintained by the sodium-potassium pump. Flows of potassium and sodium ions across the neuron plasma membrane are responsible for the changes of electrical potential that accompany the transmission of nerve impulses. See potassium ion channel.

单词	potassium
释义	potassium Chemistry A soft silvery metallic element belonging to group 1 (formerly IA) of the periodic table (see alkali metals); a.n. 19; r.a.m. 39.098; r.d. 0.86; m.p. 63.7°C; b.p. 774°C. The element occurs in seawater and in a number of minerals, such as sylvite (KCl), carnallite (KCl.MgCl₂.6H₂O), and kainite (MgSO₄.KCl.3H₂O). It is obtained by electrolysis. The metal has few uses but potassium salts are used for a wide range of applications. Potassium is an essential element for living organisms. The potassium ion, K⁺, is the most abundant cation in plant tissues, being absorbed through the roots and being used in such processes as protein synthesis. In animals the passage of potassium and sodium ions across the nerve-cell membrane is responsible for the changes of electrical potential that accompany the transmission of impulses. Chemically, it is highly reactive, resembling sodium in its behaviour and compounds. It also forms an orange-coloured superoxide, KO₂, which contains the O₂⁻ ion. Potassium was discovered by Sir Humphry Davy in 1807. https://www.webelements.com/potassium/ Information from the WebElements site Biology Symbol K. A soft silvery metallic element that is an essential element for living organisms. The potassium ion, K⁺, is the most abundant cation in plant tissues, being absorbed through the roots and being used in such processes as protein synthesis. In animals the high intracellular concentration of K⁺ relative to the extracellular fluid is a key component in establishing the resting potential of neurons, and is maintained by the sodium-potassium pump. Flows of potassium and sodium ions across the neuron plasma membrane are responsible for the changes of electrical potential that accompany the transmission of nerve impulses. See potassium ion channel.
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