Materials Literature
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Three small-celled Nupela species were found in streams and moist habitats of the United States, with a concentration of locations in the eastern part of the country. Two new species are described here: N. neglecta Ponader, Lowe & Potapova and N. Carolina Potapova & Clason. These two species and Nupela wellneri (Lange…
Abstract Chitosan grafted oligo( L ‐lactic acid) copolymers with different length of side chain were prepared through the reaction of terminal aldehyde group of oligo( L ‐lactic acid) (OLLA) and amino groups of chitosan. The mean molecular mass of the grafting OLLA chain was ca. 600 ∼ 5 000. The graft copolymers are s…
Aluminum foam metal was produced directly from the foaming method. In this foaming process, the surface tension and the viscosity of molten Al that were measured by the ring method and the rotational method, respectively, and are the two most important factors. The surface tension and the viscosity were investigated a…
Nanocrystalline nickel and zinc ferrites synthesised using a microemulsion technique were characterised by high resolution transmission electron microscopy and vibrating sample magnetometry. A narrow and uniform distribution of crystals of size range 5-8 nm, distinguished by a clear lack of saturation magnetisation at…
The use of a honeycomb zeolite concentrator and an oxidation process is one of the most popular methods demonstrated to control volatile organic compound (VOCs) emissions from waste gases in semiconductor manufacturing plants. This study attempts to characterize the performance of a concentrator in terms of the remova…
The open-closed conformational switch in the active site of Escherichia coli beta-galactosidase was studied by X-ray crystallography and enzyme kinetics. Replacement of Gly794 by alanine causes the apoenzyme to adopt the closed rather than the open conformation. Binding of the competitive inhibitor isopropyl thio-beta…
A multipole representation of the experimental electron density distribution for the high-pressure silica polymorph coesite, using Hirshfeld-type radial functions, has been generated with single-crystal X-ray diffraction data recorded to a sin θ max /λ value of 1.21 Å -1 at 100 K. Unlike an earlier modeling of the dis…
Abstract The reaction of the ligands 5 and 6 , containing two tridentate binding units, with iron( II ), cobalt( II ) and zinc( II ) leads to the self‐assembly of supramolecular architectures of [2 × 2] grid type containing four ions in octahedral coordination sites. The grid‐type structures have been assigned on the…
Abstract A crystallographic study of 13 specimens of diamonds with euhedral single-crystalline graphite inclusions in their centres is presented. All inclusions belong to the hexagonal graphite modification (space group P 6 3 / mmc ; a 0 ≈ 2.46 Å, c 0 ≈ 6.70 Å) and are up to 300 μm in diameter. Comparison of the measu…
Crack–opening displacement (COD) measurements were performed on a commercial lead zirconate titanate (PZT). The intrinsic fracture toughness (or crack–tip toughness) of this material was determined using a new evaluation procedure, which takes into account the near–tip CODs and complete crack profile CODs. The crack–t…
Abstract The mechanical properties and crystal morphological structures of dynamically photocrosslinked polypropylene (PP)/ethylene‐propylene‐diene terpolymer (EPDM) blends have been studied by mechanical tests, wide‐angle X‐ray diffraction (WAXD), scanning electron microscopy (SEM), and differential scanning calorime…
Polymer-nano-metallic-particle composites have demonstrated technological potential due to their unique optical and electrical properties. Herein, we report on composites prepared via physical vapor deposition of silver metal onto pliable poly(dimethylsiloxane) (PDMS) polymer. Rapid Ag diffusion and nano-metallic-part…
Post-steam-treatment is a facile and effective method for improving the catalytic performances of Mo/HZSM-5 catalysts in methane dehydroaromatization under nonoxidative conditions. The treatment can enhance the stability of the catalyst and also give a higher methane conversion and a higher yield of light aromatics, a…
Abstract Separating particles from the liquid in which they are suspended is often an important step in processing multiphase materials such as suspensions and emulsions. We describe a new method to separate neutrally buoyant particles from viscous liquids. The method is based on the low Reynolds number motion of free…
Aulacoseira subarctica f. subborealis differs from A. subarctica var. subarctica by a number of morphological features (smaller linking spines without areolae on their base, shorter spine grooves, discus always areolated, shallower mantle and different 'Formwechsel', considerably finer structure, rimoportula on the in…
Chitosan was covalently coupled to type I collagen by using 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide in morpholinoethane sulfonic acid buffer. The physico-chemical characteristics of the collagen/chitosan matrices (CCM) were evaluated by electron spectroscopy and tensile mechanical strength. The platelet deposit…
Abstract Thermal power stations that use pulverized coal as fuel generate large quantities of fly ash, resulting in environmental and disposal problems. Increasing demand for power leads to a greater use of coal and hence a further increase in the quantity of fly ash. These problems can be solved if the fly ash is put…
Abstract Traditional food preservatives, sodium benzoate, sodium nitrite, potassium sorbate and sodium lactate, were incorporated into synthetic plastics, low‐density polyethylene (LDPE), poly(maleic acid‐co‐olefine), polystyrene (PS) and polyethylene terephthalate (PET), aimed at producing antimicrobial packaging mat…
Abstract An unsymmetrical diamine monomer 4‐( p ‐aminophenoxy)‐3‐trifluoromethyl‐4′‐aminobiphenyl has been synthesized successfully. This monomer leads to the synthesis of different novel poly(ether imide)s when reacted with different dianhydrides like pyromellatic dianhydride (PMDA), benzophenone tetracarboxylic acid…
Biomineralization produces crystals of elaborate shapes, never seen in inorganic mineralogy, with tightly regulated compositions and axis orientations. The calcite coccoliths produced by unicellular marine algae provide an example of such control at very tiny scales. Atomic force microscopy (AFM) of two species provid…