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.

The cone-tetranitrocalix[4]arene tetraradical tetraanion as an electrochemically generated ligand for heavier alkali metal cations

2019 ◽  
Vol 55 (19) ◽  
pp. 2817-2820 ◽  
Author(s):  
Alan Liška ◽  
Pavel Vojtíšek ◽  
Jiří Ludvík
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Metal Cations ◽  
Alkali Metal Ions ◽  
Alkali Metal Cations

Tetranitrocalix[4]arene cathodically reduced to its stable tetraanion tetraradical represents an electrochemically generated ligand – a promising receptor/sensor – for alkali metal ions.

scholarly journals Role of Alkali-Metal Cations in Electronic Structure and Halide Segregation of Hybrid Perovskites

2020 ◽  
Vol 12 (30) ◽  
pp. 34402-34412 ◽  
Author(s):  
Siyuan Zhang ◽  
Ming-Chun Tang ◽  
Yuanyuan Fan ◽  
Ruipeng Li ◽  
Nhan V. Nguyen ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Alkali Metal ◽  
Metal Cations ◽  
Alkali Metal Cations

The Role of Alkali Metal Cations in MMA Polymerization Initiated by Neutral and Anionic Allyl Lanthanide Complexes

2005 ◽  
Vol 24 (15) ◽  
pp. 3685-3691 ◽  
Author(s):  
Cheslan K. Simpson ◽  
Rosemary E. White ◽  
Christin N. Carlson ◽  
Debra A. Wrobleski ◽  
Christopher J. Kuehl ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Lanthanide Complexes ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Mma Polymerization

New Bulky Allyl Complexes of Lanthanide Metals:  Role of Alkali-Metal Cations in Controlling Solid-State and Solution Assemblies in Precatalysts

2003 ◽  
Vol 22 (15) ◽  
pp. 3028-3030 ◽  
Author(s):  
Timothy J. Woodman ◽  
Mark Schormann ◽  
David L. Hughes ◽  
Manfred Bochmann
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Metal Cations ◽  
Alkali Metal Cations ◽  
Lanthanide Metals

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
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