scholarly journals Calorimetric Investigations of the Structural Stability and Interactions of Colicin B Domains in Aqueous Solution and in the Presence of Phospholipid Bilayers

2001 ◽  
Vol 276 (17) ◽  
pp. 13563-13572 ◽  
Author(s):  
Alicia Ortega ◽  
Stephan Lambotte ◽  
Burkhard Bechinger
Keyword(s):  
Aqueous Solution ◽  
Structural Stability ◽  
Phospholipid Bilayers ◽  
Calorimetric Investigations ◽  
Colicin B

Calorimetric investigations of Al3+(aq), Al(OH)4−(aq), and aluminium–citrate complexes at 298.15 K

1997 ◽  
Vol 75 (8) ◽  
pp. 1110-1113 ◽  
Author(s):  
Ching-hsien Wu ◽  
Celina Dobrogowska ◽  
Xin Zhang ◽  
Loren G. Hepler
Keyword(s):  
Aqueous Solution ◽  
Aluminum Hydroxide ◽  
Equilibrium Constants ◽  
A Value ◽  
Calorimetric Measurements ◽  
Aluminum Complexes ◽  
Aluminium Citrate ◽  
Calorimetric Investigations ◽  
Citrate Ions

We have combined results of earlier measurements leading to equilibrium constants for formation and reaction of aluminum–citrate complexes in aqueous solution at 298.15 K with results of our calorimetric measurements at this same temperature to obtain ΔH values for reactions of Al3+(aq) with citrate ions. Results of some of these calorimetric measurements also lead to a value of ΔH for the reaction Al3+(aq) + 4 OH`(aq) = Al(OH)4−(aq). Keywords: aluminum hydroxide, Al(OH)4−(aq), thermodynamics; aluminium–citrate complexes, thermodynamics; citrate–aluminum complexes, thermodynamics; aluminum (3+, aq), thermodynamics.

COMPUTER SIMULATION OF STRUCTURAL CHANGES IN PHOSPHOLIPID BILAYERS

2000 ◽  
Vol 11 (01) ◽  
pp. 153-158 ◽  
Author(s):  
ARAM A. SHAHINIAN ◽  
ARMEN H. POGHOSYAN ◽  
HAMLET G. BADALYAN
Keyword(s):  
Aqueous Solution ◽  
Computer Simulation ◽  
Structural Changes ◽  
Relative Concentration ◽  
Molecular Fragment ◽  
Phospholipid Bilayers ◽  
Phospholipid Bilayer ◽  
Bilayer Thickness ◽  
Hydrocarbon Chains ◽  
Molecular Scale

Using molecular-scale computer simulation, we show that structural changes may take place in phospholipid bilayers in an aqueous solution as we vary the relative concentration of water to phospholipids, the bilayer thickness, the inclination angle of the choline, dipole molecular fragment with respect to the bilayer surface, and the conformation of hydrocarbon chains of phospholipid in the hydrophobic volume of the bilayer. It is shown that in the hydrophobic volume of the bilayer, an interpenetration of the hydrocarbon chains located on opposite sides of the phospholipid bilayer takes place.

scholarly journals Effects of Hidrophobic Surfactant Proteins SP-B and SP-C on the Mechanical Properties and Structural Stability of Phospholipid Bilayers

2012 ◽  
Vol 102 (3) ◽  
pp. 491a
Author(s):  
Elisa Parra ◽  
Lara H.-Moleiro ◽  
Ivan Lopez-Montero ◽  
Antonio Cruz ◽  
Francisco Monroy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Structural Stability ◽  
Phospholipid Bilayers ◽  
Surfactant Proteins

Influence of Ammonium Hydroxide Treatment on Structural Stability of Polyaniline/Multi–Walled Carbon Nanotube Nanocomposites

2012 ◽  
Vol 557-559 ◽  
pp. 291-294
Author(s):  
Yue Tang ◽  
Zong Yi Qin ◽  
Na Liu
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Structural Stability ◽  
Ammonium Hydroxide ◽  
Low Molecular Weight ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Thermal Stability Of

The composites consisting of multi–walled carbon nanotubes (MWCNTs) core and polyaniline (PANI) shell were prepared in aqueous solution of hydrochloric acid, and then a de–doping process was achieved through a simple ammonium hydroxide (NH4OH) treatment. The influences of NH4OH treatment on the morphology, microstructure and thermal stability of the as–prepared composites were studied. It is found that after the removal of hydrochloric acid (HCl) as a volatile dopant and the low molecular weight components, structural stability of the treated composite could be achieved, leading to a significant enhancement on thermal properties.

Few-layer large Ti3C2Tx sheets exfoliated by NaHF2 and applied to the sodium-ion battery

2021 ◽  
Vol 9 (15) ◽  
pp. 9593-9601
Author(s):  
Yan Zhao ◽  
Meng Zhang ◽  
Hong Yan ◽  
Yu Feng ◽  
Xinyu Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Structural Stability ◽  
High Performance ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
First Time

The first time to use NaHF2 aqueous solution to synthesize Ti3C2Tx, making Na+ ions intercalated between Ti3C2Tx layers, which has excellent thermal and structural stability and is a high-performance anode for sodium-ion battery.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

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