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Reversible Control (reversible + control)

Distribution by Scientific Domains

Chemistry	50%

Selected Abstracts

Reversible Control of Exo - and Endo -Budding Transitions in a Photosensitive Lipid Membrane

CHEMBIOCHEM, Issue 2 2009
Ken-ichi Ishii
Abstract We have developed a method for the photomanipulation of lipid membrane morphology in which the shape of a vesicle can be switched by light through the use of a synthetic photosensitive amphiphile containing an azobenzene unit (KAON12). We prepared cell-sized liposomes from KAON12 and 1,2-dioleoyl- sn -glycero-3-phosphocholine (DOPC) and conducted real-time observations of vesicular transformation in the photosensitive liposome by phase-contrast microscopy. Budding transitions,either budding toward the centre of the liposome (endo -bud) or budding out of the liposome (exo- bud),could be controlled by light. We discuss the mechanism of this transformation in terms of the change in the effective membrane surface area due to photoisomerization of the constituent molecules. [source]

Control of Molecular Transport Through Stimuli-Responsive Ordered Mesoporous Materials,

ADVANCED MATERIALS, Issue 15 2003
Q. Fu
External and reversible control of the size and surface energy of the pores in mesoporous architectures has been achieved. The method involves modification of mesoporous silica by atom transfer radical polymerization of N -isopropyl acrylamide (the precursor to a stimuli- responsive polymer). The resulting polymer-grafted particles allow the adsorption and transport of molecular species to be dynamically controlled as illustrated in the Figure for the release of rhodamine 6G from the particles at 50,°C. [source]

Combinatorial, selective and reversible control of gene expression using oligodeoxynucleotides in a cell-free protein synthesis system,

BIOTECHNOLOGY & BIOENGINEERING, Issue 2 2009
Jung-Won Keum
Abstract Herein we describe the methods for selective and reversible regulation of gene expression using antisense oligodeoxynucleotides (ODNs) in a cell-free protein synthesis system programmed with multiple DNAs. Either a complete shut down or controlled level of gene expression was attained through the antisense ODN-mediated regulation of mRNA stability in the reaction mixture. In addition to the primary control of gene expression, we also demonstrate that the inhibition of protein synthesis can be reversed by using an anti-antisense ODN sequence that strips the antisense ODN off the target sequence of mRNA. As a result, sequential additions of the antisense and anti-antisense ODNs enabled the stop-and-go expression of protein molecules. Through the on-demand regulation of gene expression, presented results will provide a versatile platform for the analysis and understanding of the complicated networks of biological components. Biotechnol. Bioeng. 2009;102: 577,582. © 2008 Wiley Periodicals, Inc. [source]

Reversible Full-Range Color Control of a Cholesteric Liquid-Crystalline Film by using a Molecular Motor

CHEMISTRY - AN ASIAN JOURNAL, Issue 3 2006
Rienk Eelkema Dr.
Abstract By using a chiral molecular motor as a dopant in a cholesteric liquid-crystalline film, fully reversible control of the reflection color of this film across the entire visible spectrum is possible. The large difference in helical twisting power between the two isomeric forms of the motor allows efficient light- and heat-induced switching of the helicity of the cholesteric liquid-crystal superstructure. [source]