The zinc and cobalt forms of the prototypic gamma-carbonic anhydrase from Methanosarcina thermophila were characterized by extended X-ray absorption fine structure (EXAFS) and the kinetics were investigated using steady-state spectrophotometric and (18)O exchange equilibrium assays. EXAFS results indicate that cobalt isomorphously replaces zinc and that the metals coordinate three histidines an...

X-ray studies of nearby spiral galaxies with star formation allow us to investigate temperature and spatial distribution of the hot diffuse plasma, and to carry out individual and statistical studies of different classes of discrete sources (lowand high-mass X-ray binaries, Supernova remnants, supersoft and ultra-luminous sources). In particular, we briefly review the different models proposed ...

Heteronuclear 3D and 4D NMR experiments have been used to obtain 'H, 13C, and 15N backbone chemical shift assignments in Ca2+-loaded calmodulin complexed with a 26-residue synthetic peptide (M13) corresponding to the calmodulin-binding domain (residues 577-602) of rabbit skeletal muscle myosin light-chain kinase. Comparison of the chemical shift values with those observed in peptide-free calmod...

In this pepper Fe2O3 nanoparticles were synthesized via a fast microwave method. Then Fe2O3-TiO2 nanocomposites were synthesized by a sonochemical-assisted method. The prepared products were characterized by X-ray diffraction pattern, scanning electron microscopy and Fourier transform infrared spectroscopy. The photocatalytic behaviour of Fe2O3-TiO2 nanocomposites was evaluated using the degrad...

T h s work presents a CAM-based design for a linear array of processors. Called LAPCAM, the simcance of this architecture is, in particular, that it provides the Multi-Mode Access (MMA) memories such as FIFO, RAM. normal CAM. and interactive CAM modes. In this paper. we present the organization of the LAPCAM and we demonstrate the ability to solve global image problems in processor-time optimal...

Capacities of phosphoenolpyruvate carboxylase (PEP-Co), ribulose bisphosphate carboxylase (Rubisco), NADP+ malic enzyme (ME) and of malate dehydrogenase (MDH) were measured in the Euphorbiacea Aleurites montana, grown under 700 ppm CO2 for four weeks prior to enzyme extraction. For comparison Bryophyllum daigremontiana (CAM). Saccharum officinarum (C4) and Capsicum frutescens (C3) were treated ...

Heat-stable inhibitors (HI) of hemagglutination by influenza viruses have been extracted from the chorioallantoic membrane (CAM) of chick embryos, and in the preceding paper (1) it was shown that their general characteristics resembled those of inhibitors isolated from other biological materials which have been identified as mucoprotein in nature. Inhibitory activity of CAM extracts against hea...

The U-slot micro-strip patch antennas were originally developed for bandwidth broadening applications. This study presents a transmission line feed to modify the U-slot stacked rectangular micro-strip patch antenna for Ultra-Wide Band (UWB) communications. The modified antenna has a U-cut loaded with parallel slits and corner slots and is printed on a dielectric substrate of FR4 with relative p...

Context. The combination of compact objects, short period variability and peculiar chemical composition of the Ultra Compact X-ray Binaries make up a very interesting laboratory to study accretion processes and thermonuclear burning on the neutron star surface. The improved large optical telescopes and more sensitive X-ray satellites have increased the number of known Ultra Compact X-ray Binari...