ChemInform Abstract: A Possible Role of Alkali Metal Ions in the Synthesis of Pure-Silica Molecular Sieves.

ChemInform ◽  
2010 ◽  
Vol 24 (7) ◽  
pp. no-no
Author(s):  
M. GOEPPER ◽  
H.-X. LI ◽  
M. E. DAVIS
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Molecular Sieves ◽  
Alkali Metal Ions ◽  
Pure Silica

scholarly journals Tuning the Voltage Dependence of Tetraethylammonium Block with Permeant Ions in an Inward-Rectifier K+ Channel

1999 ◽  
Vol 114 (3) ◽  
pp. 415-426 ◽  
Author(s):  
Maria Spassova ◽  
Zhe Lu
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Ion Selectivity ◽  
Inward Rectifier ◽  
K Channel ◽  
Alkali Metal Ions ◽  
Internal Site ◽  
External Site ◽  
Ion Binding Sites

To understand the role of permeating ions in determining blocking ion–induced rectification, we examined block of the ROMK1 inward-rectifier K+ channel by intracellular tetraethylammonium in the presence of various alkali metal ions in both the extra- and intracellular solutions. We found that the channel exhibits different degrees of rectification when different alkali metal ions (all at 100 mM) are present in the extra- and intracellular solution. A quantitative analysis shows that an external ion site in the ROMK1 pore binds various alkali metal ions (Na+, K+, Rb+, and Cs+) with different affinities, which can in turn be altered by the binding of different permeating ions at an internal site through a nonelectrostatic mechanism. Consequently, the external site is saturated to a different level under the various ionic conditions. Since rectification is determined by the movement of all energetically coupled ions in the transmembrane electrical field along the pore, different degrees of rectification are observed in various combinations of extra- and intracellular permeant ions. Furthermore, the external and internal ion-binding sites in the ROMK1 pore appear to have different ion selectivity: the external site selects strongly against the smaller Na+, but only modestly among the three larger ions, whereas the internal site interacts quite differently with the larger K+ and Rb+ ions.

Enantiospecific photochemical 6π-ring closure of α-substituted atropisomeric acrylanilides – role of alkali metal ions

2014 ◽  
Vol 13 (2) ◽  
pp. 141-144 ◽  
Author(s):  
Anoklase Jean-Luc Ayitou ◽  
Anthony Clay ◽  
Elango Kumarasamy ◽  
Steffen Jockusch ◽  
J. Sivaguru
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Ring Closure ◽  
Alkali Metal Ions

scholarly journals The role of alkali metal cations in the stabilization of guanine quadruplexes: why K+ is the best

2016 ◽  
Vol 18 (31) ◽  
pp. 20895-20904 ◽  
Author(s):  
F. Zaccaria ◽  
G. Paragi ◽  
C. Fonseca Guerra
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Metal Cations ◽  
Alkali Metal Ions ◽  
Alkali Metal Cations ◽  
Equal Importance ◽  
Cation Affinity

The desolvation and size of monovalent alkali metal ions are of equal importance for the cation affinity of guanine quadruplexes.

Asymmetric Photoreactions within Zeolites:  Role of Confinement and Alkali Metal Ions†

2003 ◽  
Vol 36 (7) ◽  
pp. 509-521 ◽  
Author(s):  
J. Sivaguru ◽  
Arunkumar Natarajan ◽  
Lakshmi S. Kaanumalle ◽  
J. Shailaja ◽  
Sundararajan Uppili ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Alkali Metal Ions

scholarly journals Alkali-metal ions in the metabolism of Bact. lactis aerogenes . III. General discussion of their role and mode of action

1951 ◽  
Vol 207 (1090) ◽  
pp. 425-425
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Mode Of Action ◽  
Alkali Metal Ions ◽  
Adaptive Changes ◽  
Phosphate Ions ◽  
Wide Range ◽  
Experimental Findings

(This paper has been printed in full in Proceedings B, 138, 237) In the light of previous work in the literature and of the experimental findings described in parts I and II the role of alkali-metal ions in the growth and metabolism of Bact. lactis aerogenes is discussed. The view is favoured that the positive alkali-metal ions accompany negative phosphate ions into the cell during metabolism, and that potassium or rubidium ions are of a size suitable for incorporation into a structure involving phosphorylated intermediates and enzyme surfaces. As long as a binding of this type persists them can be an automatic displacement of hydrions from the cell, which is therefore to some extent protected against their action. The mechanism, however, by which the cell is able to grow at a rate almost independent of pH over a wide range involves also adaptive changes in the proportions of enzymes.

The role of alkali metal ions on hydrothermal stability of Cu/SSZ-13 NH3-SCR catalysts

2020 ◽  
Vol 355 ◽  
pp. 482-492 ◽  
Author(s):  
Chen Wang ◽  
Wenjun Yan ◽  
Zhixin Wang ◽  
Zexiang Chen ◽  
Jianqiang Wang ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Hydrothermal Stability ◽  
Alkali Metal Ions ◽  
Nh3 Scr ◽  
Scr Catalysts
Sign in / Sign up

Export Citation Format

Share Document