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Showing 1 to 12 of 196 entries
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The transport of potassium through lipid bilayer membranes by the neutral carriers valinomycin and monactin : Experimental studies to a previously proposed model.

The Journal of membrane biology

Stark G, Benz R.
PMID: 24173097
J Membr Biol. 1971 Jun;5(2):133-53. doi: 10.1007/BF02107720.

Stationary conductance experiments on neutral and negatively charged bilayer membranes in the presence of valinomycin or monactin agree with a recently proposed carrier transport model, which is common to both carrier types. This model assumes an interface reaction between...

An estimation of the proton conductance of the inner membrane of turnip (Brassica napus L.) mitochondria.

Planta

Moore AL, Wilson SB.
PMID: 24414876
Planta. 1978 Jan;141(3):297-302. doi: 10.1007/BF00388347.

The permeability of the inner membrane of turnip mitochondria to H(+) and OH(-) ions has been investigated using an acid pulse technique. The rate of decay of a H(+) pulse across the inner membrane is exponential having first-order kinetics...

Polymeric plasticizer extends the lifetime of PVC-membrane ion-selective electrodes.

The Analyst

Zahran EM, New A, Gavalas V, Bachas LG.
PMID: 24352534
Analyst. 2014 Feb 21;139(4):757-63. doi: 10.1039/c3an01963b. Epub 2013 Dec 18.

The nature of the plasticizer plays a pivotal role in the analytical performance of polymer membrane ion sensors. Conventional plasticizers suffer leaching or migration from the membrane and exudation, both of which could limit the lifetime of sensors based...

New lipophilic rhodamines and their application to optical potassium sensing.

Journal of fluorescence

Werner T, He H, Kessler MA, Wolfbeis OS.
PMID: 24243272
J Fluoresc. 1992 Jun;2(2):93-8. doi: 10.1007/BF00867668.

New lipophilic fluorescent rhodamines were synthesized directly from 3,6-dichlorofluoresceins and the respective long-chain amines with excellent solubility in lipids and lipophilic membranes. Spectrophotometric and luminescent properties of the dyes are reported and discussed with respect to their application in...

Tetracyclines, verapamil and nifedipine induce callose deposition at specific cell sites in Riella helicophylla.

Planta

Grotha R.
PMID: 24232763
Planta. 1986 Dec;169(4):546-54. doi: 10.1007/BF00392105.

The Ca(2+) indicator 7-chlorotetracycline has been shown to bind to a pore complex on both outer surfaces of all non-meristematic cells in the unistratose thallus of Riella ('chlorotetracycline-binding surface region'=CSR; Grotha, 1983, Planta 158, 473-481). Prolonged treatment of the...

A General Methodology for Automated Solid-Phase Synthesis of Depsides and Depsipeptides. Preparation of a Valinomycin Analogue.

The Journal of organic chemistry

Kuisle O, Quiñoá E, Riguera R.
PMID: 11674717
J Org Chem. 1999 Oct 29;64(22):8063-8075. doi: 10.1021/jo981580+.

A general methodology is described that allows the solid-phase synthesis of depsides and depsipeptides from chiral alpha-hydroxy- and alpha-amino acids. The results of studies with different protecting groups for the alpha-hydroxy acids and coupling systems for depside bond formation...

Covalent modification of the catalytic sites of the H(+)-ATPase from chloroplasts with 2-nitreno-ADP. Modification of the catalytic site 1 (tight) and catalytic sites 1 and 2 together impairs both uni-site and multi-site catalysis of ATP synthesis and ATP hydrolysis.

Biochimica et biophysica acta

Possmayer FE, Hartog AF, Berden JA, Gräber P.
PMID: 11004435
Biochim Biophys Acta. 2000 Jul 20;1459(1):202-217.

After isolation and purification, the H(+)-ATPase from chloroplasts, CF(0)F(1), contains one endogenous ADP at a catalytic site, and two endogenous ATP at non-catalytic sites. Incubation with 2-azido-[alpha-(32)P]ADP leads to tight binding of azido-nucleotides. Free nucleotides were removed by three...

Dinitrophenol and valinomycin as uncouplers in isolated chloroplasts.

FEBS letters

Karlish SJ, Avron M.
PMID: 11945242
FEBS Lett. 1968 Jul;1(1):21-24. doi: 10.1016/0014-5793(68)80008-0.

No abstract available.

An experimental study of membrane materials and inner contacting layers for ion-selective K+ electrodes with a stable response and good dynamic range.

Analytical chemistry

Michalska AJ, Appaih-Kusi C, Heng LY, Walkiewicz S, Hall EA.
PMID: 15053668
Anal Chem. 2004 Apr 01;76(7):2031-9. doi: 10.1021/ac0353132.

The goal was to identify formulations for use in valinomycin K(+) ion-selective electrodes that could routinely achieve a detection limit of

Steady-state fluorescence polarization in planar lipid membranes. Experimental and theoretical analysis of the fluorophores 8-anilino-1-naphthalenesulfonate, 1,6-Diphenyl-1,3,5-hexatriene, dansyllysine-valinomycin and n-(9-anthroyloxy) fatty acids.

Biophysical chemistry

Frehland E, Kreikenbohm R, Pohl WG.
PMID: 17000423
Biophys Chem. 1982 Apr;15(1):73-86. doi: 10.1016/0301-4622(82)87018-x.

In continuation of earlier work, the steady-state fluorescence polarization in a globally oriented system of planar lipid membranes was analyzed experimentally and theoretically for the fluorophores 8-anilino-1-naphthalenesulfonate, 1,6-diphenyl-1,3, 5-hexatriene, dansyllysine-valinomycin and n-(9-anthroyloxy) fatty acids. The theoretical analyses of experiments...

Conformational study of valinomycin: a molecular dynamics approach.

Biophysical chemistry

Shobana S, Vishveshwara S.
PMID: 17023338
Biophys Chem. 1996 Jan;57(2):163-75. doi: 10.1016/0301-4622(95)00061-5.

Valinomycin is a highly flexible cyclic dodecadepsipeptide that transports ions across membranes. Such a flexibility in the conformation is required for its biological function since it has to encounter a variety of environments and liganding state. Exploration of conformational...

Stromal pH and Photosynthesis Are Affected by Electroneutral K and H Exchange through Chloroplast Envelope Ion Channels.

Plant physiology

Wu W, Berkowitz GA.
PMID: 16668693
Plant Physiol. 1992 Feb;98(2):666-72. doi: 10.1104/pp.98.2.666.

Potassium movement across the limiting membrane of the chloroplast inner envelope is known to be linked to counterex-change of protons. For this reason, K(+) efflux is known to facilitate stromal acidification and the resultant photosynthetic inhibition. However, the specific...

Showing 1 to 12 of 196 entries