Archive for May, 2008
Thursday, May 1st, 2008
Discrete rearranging disordered patterns, part I: Robust statistical tools in two or three dimensions.
Discrete rearranging patterns include cellular patterns, for instance liquid foams, biological tissues, grains in polycrystals; assemblies of particles such as beads, granular materials, colloids, molecules, atoms; and interconnected networks. Such a pattern ...
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Thursday, May 1st, 2008
Discrete rearranging disordered patterns, part II: 2D plasticity, elasticity and flow of a foam.
The plastic flow of a foam results from bubble rearrangements. We study their occurrence in experiments where a foam is forced to flow in 2D: around an obstacle; through a narrow hole; ...
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Thursday, May 1st, 2008
Bending modulus of lipid bilayers in a liquid-crystalline phase including an anomalous swelling regime estimated by neutron spin echo experiments.
Membrane fluctuations of dipalmitoylphosphatidylcholine (DPPC) and dimyristoylphosphatidylcholine (DMPC) were investigated by neutron spin echo spectroscopy. The intermediate structure factor was analyzed in terms of the model ...
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Thursday, May 1st, 2008
A rare case of arterial thrombosis in a 37-year-old male with Factor V Leiden mutation.
BACKGROUND: The classic triad of symptoms seen in chronic mesenteric ischaemia is post-prandial pain, sitophobia (fear of food) and progressive weight loss. Patients with mesenteric ischaemia secondary to a prothrombotic state ...
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Thursday, May 1st, 2008
Accuracy of recall of the items included in disease activity forms of Behçet\'s disease: comparison of retrospective questionnaires with a daily telephone interview.
The assessment of disease activity in Behçet\'s disease (BD), either by BD Current Activity Form (BDCAF) or Iranian BD Dynamic Measure (IBDDAM), depends ...
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Thursday, May 1st, 2008
Iatrogenic diaphragmatic hernia complicating nephrectomy: top-down or bottom-up?
Hernias of the diaphragm are rarely reported as a complication of abdominal surgery. We review a case of a 47-year-old female who presented with dyspnoea and chest pain one day after left radical nephrectomy for renal cell carcinoma. ...
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Thursday, May 1st, 2008
Incisional hernia at the site of a stoma.
OBJECTIVE: Incisional hernia at the site where a patient had previously had a stoma has not been clearly studied. The aim of this study is to determine the incidence and associated factors that may lead to an incisional ...
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Thursday, May 1st, 2008
MKC-231, a choline uptake enhancer: (2) Effect on synthesis and release of acetylcholine in AF64A-treated rats.
The effect of MKC-231 on acetylcholine (ACh) synthesis and release was studied in the hippocampus of normal and AF64A-treated rats. AF64A (3 nmol/brain, i.c.v.) produced significant reduction of high-affinity choline ...
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Thursday, May 1st, 2008
Transmission disequilibrium studies in early onset of obsessive-compulsive disorder for polymorphisms in genes of the dopaminergic system.
The dopaminergic system has been shown to be involved in the aetiology of obsessive-compulsive disorder (OCD). Family studies suggest a higher genetic loading in patients with early onset OCD. ...
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Thursday, May 1st, 2008
The Janus-face kynurenic acid.
Kynurenic acid is an endogenous product of the tryptophan metabolism. Studies on the mechanism of its action have revealed that kynurenic acid at high concentrations is a competitive antagonist of the N-methyl-D: -aspartate receptor and acts as a neuroprotectant in different neurological ...
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Thursday, May 1st, 2008
A comprehensive genetic study of the proteasomal subunit S6 ATPase in German Parkinson\'s disease patients.
Dysfunction of proteasomal protein degradation is involved in neurodegeneration in Parkinson\'s disease (PD). Recently we identified the regulatory proteasomal subunit S6 ATPase as a novel interactor of synphilin-1, which is a ...
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Thursday, May 1st, 2008
Pollution, Contamination and Future Land Use at Brookhaven National Laboratory.
Scientists interested in contamination normally deal only with pollution itself, not with people\'s perceptions of pollution or the relationship between pollution and land use. The overall objective of this article was to examine the relationship between ...
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Thursday, May 1st, 2008
Human Cancer Risk from the Inhalation of Formaldehyde in Different Indoor Environments in Guiyang City, China.
This study was conducted to estimate the risk of human cancer from the inhalation of formaldehyde in different indoor environments in Guiyang City in China. Offices had the highest mean ...
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Thursday, May 1st, 2008
[Is neurochirurgical treatment of ruptured aneurysms more dangerous as neuroradiological health care?]
PURPOSE: To prospectively evaluate, with magnetic resonance (MR) imaging, long-term outcome of the brain after endovascular versus neurosurgical treatment for aneurysmal subarachnoid hemorrhage (aSAH). MATERIALS AND METHODS: Institutional review board approval and informed consent ...
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Thursday, May 1st, 2008
Decompression syndrome and the evolution of deep diving physiology in the Cetacea.
Whales repetitively dive deep to feed and should be susceptible to decompression syndrome, though they are not known to suffer the associated pathologies. Avascular osteonecrosis has been recognized as an indicator of diving habits ...
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Thursday, May 1st, 2008
Modeling the global potential energy surface of the N + N(2) reaction from ab initio data.
A new global potential energy surface for the N + N(2) exchange reaction has been built from ab initio data. To overcome the difficulty of carrying out ab initio calculations ...
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Thursday, May 1st, 2008
Decomposition of hexamethyldisilane on a hot tungsten filament and gas-phase reactions in a hot-wire chemical vapor deposition reactor.
To study the effect of an Si-Si bond on gas-phase reaction chemistry in the hot-wire chemical vapor deposition (HWCVD) process with a single source alkylsilane molecule, soft ionization ...
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Thursday, May 1st, 2008
Application of mutually immiscible ionic liquids to the separation of aromatic and aliphatic hydrocarbons by liquid extraction: a preliminary approach.
The recently discovered class of ionic liquids-mutually immiscible ionic liquids-are explored in this work for their first practical application: the separation of aromatic and aliphatic hydrocarbons ...
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Thursday, May 1st, 2008
Which factors determine the acidity of the phytochromobilin chromophore of plant phytochrome?
Quantum chemical calculations aimed at identifying the factors controlling the acidity of phytochromobilin, the tetrapyrrole chromophore of the plant photoreceptor phytochrome, are reported. Phytochrome is converted from an inactive (Pr) to an active form ...
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Thursday, May 1st, 2008
Effect of pore wall model on prediction of diffusion coefficients for graphitic slit pores.
The effect of the pore wall model on the self-diffusion coefficient and transport diffusivity predicted for methane in graphitic slit pores by equilibrium molecular dynamics (EMD) and non-equilibrium MD (NEMD) is investigated. ...
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Thursday, May 1st, 2008
Melting phenomena: effect of composition for 55-atom Ag-Pd bimetallic clusters.
Understanding the composition effect on the melting processes of bimetallic clusters is important for their applications. Here, we report the relationship between the melting point and the metal composition for the 55-atom icosahedral Ag-Pd bimetallic clusters ...
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Thursday, May 1st, 2008
Adsorption of fibrinogen on a biomedical-grade stainless steel 316LVM surface: a PM-IRRAS study of the adsorption thermodynamics, kinetics and secondary structure changes.
Polarization-modulation infrared reflection-absorption spectroscopy (PM-IRRAS) was employed to investigate the interaction of serum protein fibrinogen with a biomedical-grade 316LVM stainless steel surface, in terms ...
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Thursday, May 1st, 2008
Spectroscopic study of the Ne-Xe-NH(3) van der Waals trimer.
Rotational spectra of the Ne-Xe-NH(3) van der Waals trimer were recorded using a pulsed-nozzle, Fourier transform microwave spectrometer. Both a- and b-type transitions of eight isotopologues, namely (20)Ne-(132)Xe-(14)NH(3), (20)Ne-(129)Xe-(14)NH(3), (20)Ne-(132)Xe-(15)NH(3), (20)Ne-(129)Xe-(15)NH(3), (20)Ne-(131)Xe-(15)NH(3), (22)Ne-(132)Xe-(15)NH(3), (22)Ne-(129)Xe-(15)NH(3), and (22)Ne-(131)Xe-(15)NH(3) were ...
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Thursday, May 1st, 2008
Structural effects of Cu(ii)-coordination in the octapeptide region of the human prion protein.
The copper-binding ability of the prion protein is thought to be central to its function. The structural effects of copper coordination in the octapeptide region of the human prion protein have been investigated ...
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Thursday, May 1st, 2008
A computational study of the intramolecular deprotonation of a carbon acid in aqueous solution.
Proton transfer reactions are the rate-limiting steps in many biological and synthetic chemical processes, often requiring complex cofactors or catalysts to overcome the generally unfavourable thermodynamic process of carbanion intermediate formation. It ...
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