Materials Literature
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We have developed an applet presentation showing different structures of a nematic liquid crystal confined to a thin transparent plan-parallel cell. The nematic structures possessing single defects or their pairs may be studied. The corresponding interference textures are shown simulating the polarization optic micros…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract Six aromatic oligoazomethines were synthesized containing seven benzene rings each. The terminal rings were substituted with different groups, namely, H, Cl, NO 2 , OH, OCH 3 and CH 3 . The synthesis was carried out by condensing the para ‐substituted benzaldehydes with benzidine to give the three‐ring compou…
The so-called characteristic curve describing photosensitivity change is elaborated and shown to be a powerful tool for understanding and characterizing photosensitive growth both at a fundamental and practical level. It has been used successfully to diagnose when optimal hypersensitization has been achieved and the p…
Abstract A poly(vinylchloride) (PVC) obtained by bulk polymerization at 70 °C was modified through substitution reaction with sodium benzenethiolate (NaBT) in cyclohexanone solution at 25 °C, at various conversions up to 15 mol %. According to earlier work, this allows to change, in a controlled way, the stereochemica…
We present a Monte Carlo molecular simulation method that calculates the helical twisting power of a chiral molecule by sampling intermolecular torques. The approach is applied to an achiral nematic liquid crystalline system, composed of Gay-Berne particles, that is doped with chiral molecules. Calculations are presen…
Abstract Exfoliated poly(4, 4′‐oxybis(benzene)disulfide)/vermiculite (POBDS/VMT) nanocomposites were successfully synthesized via in situ melt intercalation of cyclo(4, 4′‐oxybis(benzene)disulfide) oligomers (COBDS) into octadecylammonium‐exchanged VMT (organo‐VMT). The POBDS/VMT nanocomposites were melt fabricated in…
The effect of periodic surface roughness on the behavior of confined soft sphere fluids is investigated using grand canonical Monte Carlo simulations. Rough pores are constructed by taking the prototypical slit-shaped pore and introducing unidirectional sinusoidal undulations on one wall. For the above geometry our st…
Abstract Two new heterobinuclear complexes, [(bipy)(C 2 O 4 )Cr(μ‐C 2 O 4 )Cu(Hfsaaep)(H 2 O)]·2H 2 O ( 1 ) and [(phen)(C 2 O 4 )Cr(μ‐C 2 O 4 )Mn(phen) 2 (N 3 )]·H 2 O ( 2 ) have been obtained by using bis(oxalato)chromium( III ) anions, [Cr(AA)(C 2 O 4 ) 2 ] − , as building blocks [AA = 2,2′‐bipyridine (bipy); 1,10‐p…
A steadily growing number of active pharmaceutical ingredients (API) exhibits low bioavailability and requires protection from enzymatic and acid-catalyzed degradation in the body. Therefore, the development of efficient carrier-based delivery systems is of increasing importance. Carrier systems based on liposomes, po…
Kleiner geht's nicht! Nanometergroße Kristallite lösen sich nicht unbedingt weiter auf. Sind sie ähnlich groß wie die beim Auflösen entstehenden Vertiefungen (siehe Bild), können sie kinetisch stabilisiert sein, auch wenn die umgebende Lösung nicht gesättigt ist. In Biosystemen sorgt dieses Verhalten für die bemerkens…
A new method for constructing nonorthogonal localized molecular orbitals (NOLMOs) is presented. The set of highly localized NOLMOs is obtained by minimization of the spread functional starting from an initial set of canonical orthogonal molecular orbitals. To enhance the stability and efficiency, the centroids of the…
Amphiphile Porenwände erleichtern die reversible Sorption von kurzkettigen Alkoholen durch das mikroporöse organisch-anorganische 1D-Hybrid [1-Na]3[PW12O40], das aus dem Calix[4]aren-Na+-Komplex 1-Na+ (R1=R2=H) und dem Polyoxowolframat-Ion [PW12O40]3− aufgebaut ist. Das analoge, mit 2-Na+ (R1=tBu, R2=CH2CO2Et) erhalte…
Heterotrimeric G protein alpha (G alpha) subunits possess intrinsic GTPase activity that leads to functional deactivation with a rate constant of approximately 2 min(-1) at 30 degrees C. GTP hydrolysis causes conformational changes in three regions of G alpha, including Switch I and Switch II. Mutation of G202-->A in…
Due to the interplay of Coulombic repulsion and attractive dipolar and van der Waals interactions, solutions of globular proteins display a rich variety of phase behavior featuring fluid-fluid and fluid-solid transitions that strongly depend on solution pH and salt concentration. Using a simple model for charge, dispe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCrystal Structure of the Complex of β-Cyclodextrin with Bithiophene and Their Oxidative Polymerization in WaterYoshinori Takashima, Yoshihumi Oizumi, Kazuya Sakamoto, Masahiko Miyauchi, Shigehiro Kamitori, and Akira HaradaView Autho…
A steadily growing number of active pharmaceutical ingredients (API) exhibits low bioavailability and requires protection from enzymatic and acid-catalyzed degradation in the body. Therefore, the development of efficient carrier-based delivery systems is of increasing importance. Carrier systems based on liposomes, po…
This paper presents the results obtained using a genetic algorithm (GA) to search for stable structures of medium size silicon clusters. In this work the GA uses a semiempirical energy function to find the best cluster structures, which are further optimized using density-functional theory. For small clusters our resu…
Dissolution of carbonate minerals has significant environmental effects. Microorganisms affect carbonate dissolution rates by producing extracellular metabolites, including complex polysaccharides such as alginic acid. Using a combined atomic force microscopy (AFM)/flowthrough reactor apparatus, we investigated the ef…
Abstract For Abstract see ChemInform Abstract in Full Text.