Fenitrothion-induced changes in lipids of rats

The dose-dependent lipid accumulation caused by fenitrothion administration is associated with alteration of the ratio of various components of phospholipids and neutral lipids in various organs of rats up to 48 h. The concentration of triacylglycerol, phosphatidyl choline, phosphatidyl ethanolamine and phosphatidyl glycerol increased in liver, kidney and brain in treated rats whereas phosphatidyl serine was greatly reduced. High-performance liquid chromatography and gas-liquid chromatography were used for quantiative analysis of phospholipids and triacylglycerol. The changes in relative composition of various lipids by fenitrothion administration may lead to malfunctioning and alteration of biological properties.     

Complexes of dibromo(ethylenediamine)-palladium(II) observed from aqueous solutions by electrospray mass spectrometry

The dimeric complex of dibromo(ethylenediamine)palladium(II) observed in water was investigated using electrospray mass spectrometry. One microM aqueous solutions of Pd(en)Br2 yielded a variety of previously unreported species. The most abundant ion observed was attributable to the Pd(en)Br2.Pd(en)Br+ dimeric complex at m/z 568.7 (most abundant stable isotopes). The characteristics of the oligomeric complexes were examined using collision-induced dissociation (CID) up to MS6. The most common loss mechanism observed was loss of HBr leaving an unsaturated Pd(II) center. Fragmentation of the ethylenediamine ligand was also observed during CID experiments. Loss of Pd was only observed as the final step in the CID process when other loss mechanisms had been exhausted. A number of calculations were carried out at the B3-LYP/SBKJC[d] level of theory in an attempt to elucidate the structure of the [2M-Br]+ dimer.     

Structure-Bonding Relationships in the Laves Phases

The Laves phase structures (MgCu₂ MgZn₂ and MgNi₂ types) are adopted by a large number of binary intermetallic compounds of composition AB₂. These phases belong to the class of tetrahedrally closepacked alloys. Two of the structural features of the Laves phases which have aroused interest are, firstly the dependence of the structure adopted (especially the choice between the cubic MgCu₂ and hexagonal MgZn₂ types) on the number of valence electrons of the constituent metal atoms and, secondly the structural distortions observed in a number of the hexagonal MgZn₂ type phases. By performing extended Hückel band calculations on model AB₂ compounds with both the cubic and hexagonal structures and on the B sub-nets alone, structure electron-count and deformation-electron count correlations are derived. These correlations depend on the highly peaked nature of the density of states of the Laves phases, primarily due to the B network.     

Mixed-ligand complexes of osmium(III/II)8-quinolinolates with one diimine/azoimine ligand

Summary Paramagnetic [Os^IIIDQ₂]⁺ and diamagnetic [Os^IIAQ₂] (Q = deprotonated 8-quinolinols, D = diimines and A = azoimines) complexes were prepared and characterised by physicochemical, magnetic and spectroscopic methods. The complexes exhibit several spin-allowed and spinforbidden charge-transfer transitions in the visible region. In MeCN solution the OsN₄O₂ unit displays nearly reversible Os^IV-Os^III and Os^III-Os^II couples in the ca. -0.4 to +1.1 V range versus SCE. An anodic shift of these responses is seen in going from diimines to azoimines. The stability of metal oxidation levels is correlated on the basis of -acceptor properties of these ligands.     

Bicyclo [2.2.1]heptane as cyclopentane precursor. synthesis of benzhydropentalenes enroute to terpenoids

The synthesis of a bicyclo[2.2.l] heptane derivative and its transformation to two different cyclopentanoid derivatives and through intramolecular functionalisation is described for entry into diterpene and sesquiterpene.     

High pt and photon physics with ALICE at LHC

ALICE,A Large Ion Collider Experiment,is dedicated to study the QCD matter at extreme high temperature and density to understand the Quark Gluon Plasma (QGP) and phase transition.High-transversemomentum photons and neutral mesons from the initial hard scattering of partons can be measured with ALICE calorimeters,PHOS (PHOton Spectrometer) and EMCAL (ElectroMagnetic CALorimeter).Combing the additional central tracking detectors,the γ-jet and π 0-jet measurements thus can be accessed.These measurements offer us a sensitive tomography probe of the hot-dense medium generated in the heavy ion collisions.In this paper,high p T and photon physics is discussed and the ALICE calorimeters capabilities of high-transverse-momentum neutral mesons and γ-jet measurements are presented.