The Ca2+ release-activated Ca2+ (CRAC) channel is the most well-documented of the store-operated ion channels that are widely expressed and are involved in many important biological processes. However, the regulation of the CRAC channel by intracellular or extracellular messengers as well as its molecular identity is largely unknown. Specifically, in the absence of extracellular divalent cations, it becomes permeable to monovalent cations with a larger conductance, however, this monovalent cation current inactivates rapidly by an unknown mechanism. Here we found that Ca2+ dissociation from a site on the extracellular side of the CRAC channel is responsible for the inactivation of its Na+ current, and Ca2+ occupancy of this site otherwise potentiates its Ca2+ as well as Na+ currents. This Ca2+-dependent potentiation is required for the normal functioning of CRAC channels.
Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms.
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The concentration of in the stack gas = 12 ppmv
That means 12 L of is present per
The given temperature is 273 K (0 C) and pressure is 1 atm. At these conditions, 1 mol of gas would occupy,
V = 22.4 L
1 mol occupies 22.4 L
Moles of =
Mass of = =μg
Converting :
=
Calculating the concentration in μg/:
D. Solute is the answer
Hope it's help
Metalloids show the properties that are midway between metals and non metals. Silicon is a metalloid and for this reason it is abundantly used in computer chip industry. Silicon and other metalloid elements are building blocks of electronics because they are cheap, easily available, economical.
Answer : Option C) 0.3 mol of Gold.
Explanation : Amongst the options given in the question, 0.3 mol of Au is the greatest in mass in grams.
As 0.3 mol X atomic weight of Au (196.966) = 59.088 grams;
Silver has 0.5 mol X atomic weight of Ag (107.86) = 53.93 grams;
The other options are not relevant as they deal in the atomic range which has mass value very less as compared to the moles of elements.
Therefore, it is clear that Au has the greatest mass amongst the given choices.