Materials Literature
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HPr kinase/phosphorylase (HprK/P) controls the phosphorylation state of the phosphocarrier protein HPr and regulates the utilization of carbon sources by Gram-positive bacteria. It catalyzes both the ATP-dependent phosphorylation of Ser-46 of HPr and its dephosphorylation by phosphorolysis. The latter reaction uses in…
Ferroelectric thin films such as barium strontium titanate (BST) and lead zirconate titanate (PZT) are potential materials for high-density dynamic/ferroelectric random-access memory applications. However, the properties of BST and PZT thin films are observed to be significantly inferior to their bulk counterparts. In…
Nanostructured Si thin films, also referred as polymorphous, were grown by plasma-enhanced chemical vapor deposition. The term “polymorphous” is used to define silicon material that consists of a two-phase mixture of amorphous and ordered Si. The plasma conditions were set to obtain Si thin films from the simultaneous…
The synthesis of nanosized powders with targeted properties and their assembly is of considerable importance to the microelectronics industry because of the pervasive drive to miniaturize components. In the current work, synthesis of nanosized silver (Ag) metal platelets was studied. The platelets were synthesized in…
Cadmium sulfide nanoparticles were formed within both modified mesoporous aluminosilicate MCM-41 and siliceous SBA-15. Syntheses involved the formation of a monolayer of silylation reagent, (3-mercaptopropyl)trimethoxysilane, on the surfaces of both MCM-41 and SBA-15, which served to preposition the sulfide source wit…
Abstract The sonochemical reduction of gold(III) [tetrachloroaurate(III)] was carried out under various irradiation conditions in an aqueous solution containing only a small amount of 1-propanol. Identical starting materials and the same initial concentrations were used in each preparation. The rates of gold(III) redu…
Poly(vinyl alcohol) (PVA) and poly(methyl methacrylate) (PMMA) were assembled from NaCl-containing aqueous and organic solutions, respectively, by their stepwise physical adsorption onto a quartz crystal microbalance (QCM) substrate, which enabled the quantitative analysis of the assembly process. The layer-by-layer (…
Glutamine synthetase I (GSI) enzyme activity in Streptomyces coelicolor is controlled post-translationally by the adenylyltransferase (GlnE) as in enteric bacteria. Although other homologues of the Escherichia coli Ntr system (glnK, coding for a PII family protein; and glnD, coding for an uridylyltransferase) are foun…
Several adducts are isolated between heterocyclic nitrogen bases and Cp* 2 Yb. The adducts fall into several general classes. The membership within the class is related to the reduction potential of the given heterocyclic base relative to that of Cp* 2 Yb. Analytically pure 1:1 adducts of the type Cp* 2 Yb(L) are form…
It is important to be able to measure the parameters, such as spatial resolution, astigmastism, signal-to-noise ratio, and drift and instability, that characterize the performance of a scanning electron microscope. These quantities can be determined most reliably by a Fourier analysis of digital micrographs from the i…
The glycyl radical enzyme pyruvate formate-lyase (PFL) synthesizes acetyl-CoA and formate from pyruvate and CoA. With the crystal structure of the non-radical form of PFL in complex with its two substrates, we have trapped the moment prior to pyruvate cleavage. The structure reveals how the active site aligns the scis…
Cationic copolymers of diallyldimethylammonium chloride (DADMAC) and N-methyl-N-vinylacetamide (NMVA) were synthesized by radical polymerization in a broad range of composition. Since the cyclocopolymerization of DADMAC and NMVA proceeded as nearly ideal reaction, linear copolymers of different charge densities but ap…
Dendrimer nanocomposites (DNC) are hybrid nanoparticles formed by the dispersion and immobilization of guest atoms or small clusters in dendritic polymer matrices. They have a great potential in biomedical applications due to their controlled composition, predetermined size, shape and variable surface functionalities.…
ABSTRACT: ‘Fortune’ mandarin oranges were coated with edible hydroxypropyl methylcellulose‐lipid composite coatings. The coatings consisted of beeswax, carnauba wax, or shellac, at 2 lipid contents (20% and 60%). Weight loss of coated mandarins decreased significantly as lipid content increased. Beeswax (60%) emulsion…
Cell division, the mating system, and auxosporulation were studied in the marine epipelic diatom Seminavis cf. robusta Danielidis & D. G. Mann. The interphase protoplast contains two girdle‐appressed chloroplasts, each with an elongate bar‐like pyrenoid, and also a central nucleus, located in a bridge between two…
Abstract Kinetics and mechanism of equifunctional 4,4′‐( N , N ′‐bismaleimide)‐diphenylmethane/2,2′‐diallyl‐bisphenol A (BMDM/DABPA) and model (phenylmaleimide/2,2′‐diallylphenol) (PMI/AP) systems have been studied in the temperature range 140–400 °C using IR‐, 1 H‐ and 13 C‐NMR spectroscopy, gas chromatography–mass…
Natural fibre-biopolymer composites have been prepared from flax and polyhydroxybutyrate (PHB). The flax was modified by drying, followed by plasticiser absorption to replace the water lost to prevent embrittlement. This protects the fibres from problems associated with their water content and changes in water content…
Novel surface-functionalized metal oxo clusters were obtained using an in situ surface-modification method based on the sol−gel process. A reaction of 2-bromoisobutyric acid with Zr(OPr) 4 or Ti(O i Pr) 4 resulted in the compounds Zr 5 O 4 (BrC(CH 3 ) 2 COO) 10 (O n Pr) 2 ( n PrOH) 4 and Ti 6 O 4 (BrC(CH 3 ) 2 COO) 8…
In situ neutron diffraction at 0.9 s time resolution was used to reveal the reaction mechanism during the self‐propagating high‐temperature synthesis (SHS) of Ti 3 SiC 2 from furnace‐ignited stoichiometric 3Ti + SiC + C mixtures. The diffraction patterns indicate that the SHS proceeded in five stages: (i) preheating o…
The paper deals with the computation of very fast transient overvoltages (VFTO) in transformer windings. For this purpose an algorithm is developed. The applied algorithm uses a hybrid model, which is a combination of the multi-conductor transmission line model (MTLM) and the single-transmission line model (STLM). By…