Is whole-body trauma MDCT justified in patients in good clinical condition but with dangerous trauma mechanism?

Background: To assess whether whole body MDCT is justified in patients in good clinical condition yet with dangerous trauma mechanism. Material/Methods: The study included 81 patients who were examined between January and July 2008 with wholebody trauma CT protocol. Inclusion into the study was based on a dangerous trauma mechanism and the possibility of an unbiased calculation of the weighted revised trauma score (RTSw). All examinations were performed with 16 row MDCT scanner located in emergency department. The cut off of the RTSw over 6.0 was used to separate the patients in good clinical condition. The CT examinations and medical records of patients were reviewed to assess the number of significant injuries, the need for emergency surgery and other types of medical treatment, the number of negative CT examinations, the number of patients admitted to hospital, and mortality. Results: 28 life-threatening injuries were found in 21 of 61 patients with RTS over 6.0 (34.4%). Only two of those patients required emergency surgery (laparotomy). CT studies were negative for traumatic injuries in 22 patients from this group (36.0%). Conclusions: Whole-body MDCT may detect injuries in patients in good clinical condition, with some of them demanding medical treatment. Still, further studies are required to balance the advantages of MDCT and potentially harmful effects of radiation dose, especially better triage systems and lowdose protocols are needed

The structure of coordination precursors as an effective tool for governing of size and morphology of ZnS and ZnO nanoparticles

The zinc sulphide and zinc oxide micro- and nanoparticles of different shapes were synthesized from the five zinc coordination precursors, via controlled thermal decomposition process. The precursors were synthesized from zinc thiocyanate and N-donor ligands (2-aminopyrimidine, 1H-1,2,4-triazole and hexamethylenetetraamine), and they possessed different molecular and crystal structures (confirmed by X-ray crystallographic and spectroscopic studies). The proper set of parameters of precursors conversion process allows producing of ZnS in cubic (sphalerite) and hexagonal (wurtzite) form, as well as ZnO in hexagonal form. The relationship between the particles geometry (size and morphology) and the precursor structure, as well as the parameters of thermal conversion process was investigated. Keywords: Zinc thiocyanate, Coordination compound, Zinc sulphide, Zinc oxide, Crystal structure, Single precursor metho

Revealing the structural chemistry of the group 12 halide coordination compounds with 2,2′-bipyridine and 1,10-phenanthroline

<p>The coordination compounds of group 12 halides with 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen), 2[CdF₂(bpy)₂]·7H₂O (<b>1</b>), [ZnI(bpy)₂]⁺·I₃⁻ (<b>2</b>), [CdI₂(bpy)₂] (<b>3</b>), [Cd(SiF₆)H₂O(phen)₂]·[Cd(H₂O)₂(phen)₂]²⁺·F^–·0.5(SiF₆)^2–·9H₂O (<b>4</b>), [Hg(phen)₃]²⁺·(SiF₆)^2–·5H₂O (<b>5</b>), [ZnBr₂(phen)₂] (<b>6</b>), 6[Zn(phen)₃]²⁺·12Br^–·26H₂O (<b>7</b>) and [ZnI(phen)₂]⁺·I^– (<b>8</b>), have been synthesized and characterized by X-ray crystallography, IR spectroscopy, elemental and thermal analysis. Structural investigations revealed that metal : ligand stoichiometry in the inner coordination sphere is 1 : 2 or 1 : 3. A diversity of intra- and intermolecular interactions exists in structures of <b>1</b>–<b>8</b>, including the rare halogen⋯halogen and halogen⋯<i>π</i> interactions. The thermal and spectroscopic properties were correlated with the molecular structures of <b>1</b>–<b>8</b>. Structural review of all currently known coordination compounds of group 12 halides with bpy and phen is presented.</p

Structural Insights into Influence of Isomerism on Properties of Open Shell Cobalt Coordination System

The two coordination compounds of cobalt were designed and synthesized. The substrates were carefully selected to allow gentle tuning of the molecular structure of the designed compounds. The crystal, molecular and supramolecular structure of studied compounds has been determined and discussed. The spectroscopic and thermal properties of designed coordination compounds have been studied and their application as precursors for the synthesis of cobalt oxide nanoparticles has been demonstrated. It was proven that not only are parameters of conversion of the precursor to nanoparticles important, but also small changes in molecular structure can considerably affect the size of formed particles. For unambiguous determination of the influence of compounds structure on their UV-Vis radiation absorption, density functional theory and time-dependent density functions theory calculations have been performed. The complexity of the correct ab-initio reflection of the open shell molecular system was outlined and discussed. The results obtained from density functional theory (DFT) calculations have been also employed for discussion of the bonding properties

Synthesis of 4-Alkyl-4<i>H</i>-1,2,4-triazole Derivatives by Suzuki Cross-Coupling Reactions and Their Luminescence Properties

New derivatives of 4-alkyl-3,5-diaryl-4H-1,2,4-triazole were synthesized utilizing the Suzuki cross-coupling reaction. The presented methodology comprises of the preparation of bromine-containing 4-alkyl-4H-1,2,4-triazoles and their coupling with different commercially available boronic acids in the presence of ionic liquids or in conventional solvents. The obtained compounds were tested for their luminescence properties

1,3,4-Thiadiazole-Containing Azo Dyes: Synthesis, Spectroscopic Properties and Molecular Structure

Three series of azo dyes derived from 2-amino-5-aryl-1,3,4-thiadiazoles and aniline, N,N-dimethylaniline and phenol were synthesized in high yields by a conventional diazotization-coupling sequence. The chemical structures of the prepared compounds were confirmed by 1H-NMR, 13C-NMR, IR, UV-Vis spectroscopy, mass spectrometry and elemental analysis. In addition, the X-ray single crystal structure of a representative azo dye was presented. For explicit determination of the influence of a substituent on radiation absorption in UV-Vis range, time-dependent density functional theory calculations were performed