Materials Literature
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Fest im Sattel: Der potenziell vierzähnige Ligand Triethanolamin (teaH3) öffnet eine Syntheseroute zu gemischtvalenten Manganclustern mit drei neuen Strukturtypen, darunter eine annähernd rechteckige Topologie und eine Sattelform (siehe Bild: MnIII violett, MnII gelb, O rot, N blau, C grau). Zwei dieser Komplexe sind…
When the tryptophan synthase alpha- and beta(2)-subunits combine to form the alpha(2)beta(2)-complex, the enzymatic activity of each subunit is stimulated by 1-2 orders of magnitude. To elucidate the structural basis of this mutual activation, it is necessary to determine the structures of the alpha- and beta-subunits…
We studied the optical properties of sol-gel synthesized porous silica excited by synchrotron radiation in the 4-10 eV range. The spectral and temporal characteristics of the ultraviolet photoluminescence at about 3.7 eV are reported. The UV emission results from the contribution of two different centers: the first on…
Results of the experimental and theoretical investigations into hydrogen sorption by various carbon nanostructures, including fullerenes, single-walled and multi-walled nanotubes, nanofibres, nanographite and nanographite-based composites are surveyed. Results of a thermodynamic analysis of the most significant experi…
With the wider use of composite materials in aviation, the observation of their quality during exploitation is becoming more topical. We are of the opinion that acoustic technologies of all in one control offer us promising possibilities to observe and research the characteristics and parameters of composite materials…
Pyruvate phosphate dikinase (PPDK) reversibly catalyzes the conversion of ATP, phosphate, and pyruvate into AMP, pyrophosphate, and phosphoenolpyruvate (PEP), respectively. Since the nucleotide binding site (in the N-terminal domain) and the pyruvate/PEP binding site (in the C-terminal domain) are separated by approxi…
Electrostatically layered aluminosilicate nanocomposites have been prepared by the sequential deposition of poly(allylamine hydrochloride)/poly(acrylic acid)/poly(allylamine hydrochloride)/saponite (PAH/PAA/PAH/saponite)10 on poly(ethylene terephtalate) (PET) film. Exfoliated saponite nanoplatelets were obtained by ex…
Magnetismus – jetzt geht's rund! Der Ligand N-Methyldiethanolamin (mdaH2) ist Bestandteil neuer Mn12- und Mn4-Einzelmolekülmagnete (SMMs) mit Grundzustandsspins von S=7 bzw. S=9. Die abgebildete Mn12-Spezies (MnIII grün, MnII orange, O rot, N blau, C grau) ist einer von wenigen bekannten SMMs mit cyclischer Struktur.…
1,2-Naphthalene-ring-expanded tetraazachlorins (TACs), tetraazabacteriochlorins (TABCs), and tetraazaisobacteriochlorins (TAiBCs) have been synthesized. Procedures for the synthesis of the starting materials, that is, derivatives of 1,2-naphthalenedicarboxylic acid, have been reinvestigated and improved. Nine possible…
A novel route for the self-assembly of nanoparticles to nanospheres at a liquid/liquid interface has been developed to prepare palladium nanospheres. It has proved that the interface offers an excellent site and plays a key role in the self-assembly of nanoparticles to nanospheres. The palladium nanospheres are charac…
This paper describes the use of surface chemical modification to enhance the difference of the surface charge on a patterned polyelectrolyte multilayer, which can be used for selectively adsorbing functional materials. We fabricated a patterned multilayer by combining the layer-by-layer self-assembly technique and pho…
Double-wall carbon nanotubes (DWNTs) have been selectively synthesized over Fe/Co loaded mesoporous silica by catalytic chemical vapor deposition of alcohol. Several silica materials with desired pore diameter and morphology have been investigated for the DWNT growth. The diameter distribution and selectivity of the D…
Microorganisms containing short-chain-length (scl-) or medium-chain-length (mcl-) poly(hydroxyalkanoates) (PHAs) are commonly screened by applying rapid staining methods using lipophilic reagents. These methods provide powerful means for general screening of organisms actively producing and accumulating PHAs. The Sout…
The structural investigation of Sn 2 P 2 O 7 was carried out for the first time by means of single crystal and powder X-ray diffraction. The crystal structure of β-Sn 2 P 2 O 7 pyrophosphate was solved using single-crystal X-ray data at room temperature and at 93 K. At room temperature the structure (triclinic, P 1̄,…
Silks are a widely studied class of naturally occurring structural proteins. Dragline spider silk, in particular, is considered to be nature's high-performance material due to its remarkable combination of strength and toughness. These mechanical properties stem from the protein secondary structure, a combination of w…
Large-pore mesoporous silicas with wormhole framework structures have been assembled through hydrogen-bonding pathways from sodium silicate or tetraethyl orthosilicate (TEOS) as the silica source and amine-terminated Jeffamine surfactants of the type H 2 NCH(CH 3 )CH 2 [OCH 2 CH(CH 3 )] x NH 2 as the structure-directi…
Pyruvate and acetyl-CoA form the backbone of central metabolism. The nonoxidative cleavage of pyruvate to acetyl-CoA and formate by the glycyl radical enzyme pyruvate formate lyase is one of the signature reactions of mixed-acid fermentation in enterobacteria. Under these conditions, formic acid accounts for up to one…
In this present study, nanoporous silica SBA-15 supported palladium catalysts are prepared through two different methods. The catalysts are employed for catalytic deep oxidation reaction of benzene at a high gas hourly space velocity of 100,000 h(-1). It is found that the traditional aqueous impregnation method has so…
Creeping Conformity , the first history of suburbanization in Canada, provides a geographical perspective –both physical and social –on Canada's suburban past. Electronic Format Disclaimer: Two images removed at the request of the rights holder.
Abstract Single crystals of methyl 3‐(4‐methoxyphenyl)prop‐2‐enoate were grown by the slow evaporation technique and vibrational spectral analysis was carried out using near‐IR Fourier transform Raman and Fourier transform IR spectroscopy. Ab initio quantum computations were also performed at the HF/6–311G (d,p) level…