Materials Literature
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Poster Sessions dual specificity toward UMP or CMP, while the enzymes of bacteria origin exhibit a more dedicated UMP-specific activity, and appears to be essential for bacterial growth. Thus, bacterial UMPKs may represent potential targets for developing antibacterial drugs. Although several UMPK apo-form structures…
In the present work, an ultrasoundic procedure for the extraction of phosphorus (P) available in soil is described. The proposed method is based on extraction by 0.5 M sodium bicarbonate (NaHCO3), following with sonication under different conditions. Phosphorus was determined by the Murphy and Riley method. Sonication…
A simple one-step method for the chloromethylation of polyimide (PI) under mild conditions was used to introduce benzyl chloride groups into PI film surface. Covalently tethered hydrophilic polymer brushes of poly(ethylene glycol) monomethacrylate (PEGMA) and glycidyl methacrylate (GMA) were prepared via surface initi…
The first series of carbosilane liquid crystal codendrimers with groups of different polarity has been synthesized. The chemical structure of the newly synthesized materials and the composition of the codendrimers were studied by NMR spectroscopy and MALDI-TOF MS. It was found that the codendrimers tend to form stable…
Abstract Zr-grafted SBA-15 is the most effective support among Zr-modified SBA-15 materials prepared by various methods for supporting Co catalyst in the Fischer–Tropsch synthesis due to the large BET surface area of the support and the strong interaction between Zr promoter and Co catalyst.
Lectures highly functional character. The molecular building block (MBB) approach introduces the ability to generate rigid and directional building blocks, mostly in situ, for the construction of MOMs having specific underlying networks and/or targeted functions/properties. Here we will discuss three basic strategies…
The paper presents a brief review of the pre- sent state of high-temperature borate crystal chemistry. This review summarizes the results of high- and low-tem- perature single crystal X-ray diffraction studies for more than 10 borate structures and high-temperature powder X- ray diffraction data for about 65 borates.…
Desilication and leaching are processes that accompany plinthilization, leading to nutrient depletion. Soils from 12 profiles in a plinthitic landscape were analyzed for extractable micronutrients [iron (Fe), zinc (Zn), manganese (Mn), and copper (Cu)]. Soils of the landscape from crestal to lower‐slope position conta…
The end of the triennium marks 60 years of publication of IUCr Journals, and a special issue to highlight this event has been published in Acta Cryst. A. The continued success of the Journals is based on many outstanding contributions of numerous members of the large, but highly interactive community of crystallograph…
In 2008, the Journal of Applied Crystallography celebrates its 40th year of publication.It continues to be a broad international forum for the comprehensive coverage of all topics related to the application of crystallographic methods in all branches of the natural sciences.Articles focus on these methods and their us…
The low-molecular weight poly(ϵ -caprolactone) and polylactide were obtained by the polymerization of cyclic esters in the presence of amino acid initiators. The polymer structures were elucidated by means of MALDI TOF, NMR and IR studies. Effects of temperature, reaction time and initiator dosage on the polymerizatio…
Self-assembling thermo-reversibly gelling anionic and zwitterionic pentablock copolymers were used as templates for precipitation of calcium phosphate nanostructures, controlling their size and ordered structural arrangement. Calcium and phosphate ions were dissolved in a block-copolymer micellar dispersion at low tem…
Six new hyperpolarizable chromophores based on functionalized arylthiophene donors and an imidazo-phenanthroline acceptor moiety have been designed and synthesized for the first time in good to excellent yields by condensation of 5,6-phenantroline-dione with formyl-arylthiophene derivatives in the presence of ammonium…
Silicon nanowires (Si NWs), one-dimensional single crystalline, have recently drawn extensive attention, thanks to their robust applications in electrical and optical devices as well as in the strengthening of diamond/SiC superhard composites. Here, we conducted high-pressure synchrotron diffraction experiments in a d…
A chiral and fluorescent columnar mesogen prepared from chiral binaphthols is reported. This liquid crystal comprises a C2-symmetric chiral core with two staggered aromatic planes. Its hexagonal columnar (Col(h)) mesophase was characterized by appropriate physical methods.
We use femtosecond time-resolved two-photon photoemission spectroscopy (TR-2PPE) to study the dynamics of electrons excited at the ZnO (101̅0) surface. Efficient relaxation of hot electrons within the Γ valley of the bulk conduction band results in sub-30 fs lifetimes for electron energies greater than 0.1 eV above th…
The reactivity of nonterminated diamond low-index surfaces has been evaluated using density functional theory (DFT). The intrinsic electronic structures of the topmost carbon atoms of diamond (100)−1 × 1, (100)−2 × 1, (110)−1 × 1, (111)−1 × 1, and (111)−2 × 1 surfaces have been calculated and analyzed using highly acc…
We report an X-ray-based investigation of the formation and luminescent properties of oxide-embedded silicon nanocrystals (Si-NCs) formed by the thermolysis of hydrogen silsesquioxane (HSQ). Near edge X-ray absorption fine structure (NEXAFS) spectroscopy at the Si K-edge was used to monitor the evolving electronic cha…
The emphasis of Section C continues to be the rapid publication of full papers describing one or more interesting or unusual crystal structures in significant detail. High-quality detailed studies of novel and challenging crystal and molecular structures of interest in the fields of chemistry, biochemistry, mineralogy…
Additional unpaired electrons have been introduced into colloidal ZnO quantum dots (QDs) photochemically and investigated by experimental and theoretical methods to test various possible descriptions of their wave functions. For n-type ZnO QDs with diameters between 3.0 and 7.0 nm, electron paramagnetic resonance (EPR…