Conduction of ions through the NaK channel, with M0 helix removed, was studied using both Brownian dynamics and molecular dynamics. Brownian dynamics simulations predict that the truncated NaK has approximately a third of the conductance of the related KcsA K+ channel, is outwardly rectifying, and has a Michaelis-Menten current-concentration relationship. Current magnitude increases when the gl...

The phenomenon of antiordering, i.e., preferred Al occupation of the T 2o position of the albite structure, was observed in a two-phase feldspar from Pektusan Volcano, Primorie. This paper reports the results of the computer modeling of this phenomenon. Calculations were carried out in an ionic approximation and confirm that, under ordinary conditions, the most preferable is normal Al ordering ...

Nobuyuki Wada ([email protected]) Kiminori Sugino ([email protected]) Takashi Mimura ([email protected]) Mitsuji Nagahama ([email protected]) Wataru Kitagawa ([email protected]) Hiroshi Shibuya ([email protected]) Keiko Ohkuwa ([email protected]) Hirotaka Nakayama ([email protected]) Shohei Hirakawa ([email protected]) Yasushi Rino (rino...

Given a prime p and distinct non-zero integers a1, a2, . . . , ak (mod p), we investigate the number N = N(a1, a2, . . . , ak; p) of residues n (mod p) for which (na1)p < (na2)p < . . . < (nak)p, where (b)p is the least non-negative residue of b (mod p). We give complete solutions to the problem when k = 2, 3, 4, and establish some general results corresponding to k ≥ 5. 2000 Mathematics Subjec...

New relationships among the low-temperature alkali feldspars were deduced in part and implied in whole by recent crystal structure analyses of low and high albite and consideration of the electrostatic charge distributions in all the known alkali feldspar structures by Ferguson, Traill & Taylor. In general the most stable low-temperature forms are not those most highly ordered with respect to A...

Recent developments in the use of more stable feldspar signals in the luminescence dating of sediments offer the possibility of obtaining accurate feldspar luminescence ages for ceramic artefacts; this is especially interesting in locations which do not provide suitable quartz extracts. Here we examine the application of the stable infrared stimulated luminescence signal measured at elevated te...