منابع مشابه
Counting charges
Voltage-gated ion channels of excitable tissue have evolved an exquisite sensitivity to membrane potential. The open probability of a typical potassium or sodium channel, for example, may be increased by two orders of magnitude in response to a depolarization of less than 10 mV (Zagotta et al., 1994; Hirschberg et al., 1995). As recognized by Hodgkin and Huxley (1952), this responsiveness to ch...
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A defining moment in President Bill Clinton’s presidency came when he argued that his entanglement with an intern hinged on the definition of the word “is.” Likewise, President Barack Obama’s administration is now taking considerable heat for attempting to redefine the word “gone.” That’s the word that Obama aide (and former Clinton official) Carol Browner used when describing what has happened...
متن کاملOn Counting Polynomials of Some Nanostructures
The Omega polynomial(x) was recently proposed by Diudea, based on the length of strips in given graph G. The Sadhana polynomial has been defined to evaluate the Sadhana index of a molecular graph. The PI polynomial is another molecular descriptor. In this paper we compute these three polynomials for some infinite classes of nanostructures.
متن کاملCounting Electrical Charges: a Problem of Thermal Escape and Quantum Tunneling in Presence of Non-gaussian Noise
Electrical noise produced when charges flow through a mesoscopic conductor is non-Gaussian, where higher order cumulants carry valuable information about the microscopic transport process. In these notes we briefly discuss the experimental situation and show that theoretical descriptions for the detection of electrical noise with Josephson junctions lead to generalizations of classical and quan...
متن کاملMystery of Point Charges
We discuss the problem of finding an upper bound for the number of equilibrium points of a potential of several fixed point charges in Rn. This question goes back to J. C. Maxwell and M. Morse. Using fewnomial theory we show that for a given number of charges there exists an upper bound independent of the dimension, and show it to be at most 12 for three charges. We conjecture an exact upper bo...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1996
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.108.3.129