octamethyl cyclotetrasiloxane

cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl- cyclotetrasiloxane, octamethyl- 2,2,4,4,6,6,8,8- octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane 2,2,4,4,6,6,8,8- octamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocane union carbide 7207 volasil 244 PubMed: Trophic transfer of methyl siloxanes in the marine food web from coastal area of northern china. PubMed: Nanorheology by atomic force microscopy. PubMed: Regeneration of siloxane-exhausted activated carbon by advanced oxidation processes. PubMed: Occurrence of cyclic and linear siloxanes in indoor air from Albany, New York, USA, and its implications for inhalation exposure. PubMed: Fate of anthropogenic cyclic volatile methylsiloxanes in a wastewater treatment plant. PubMed: Aggregate dermal exposure to cyclic siloxanes in personal care products: implications for risk assessment. PubMed: Measurement of cyclic volatile methylsiloxanes in the aquatic environment using low-density polyethylene passive sampling devices using an in-field calibration study--challenges and guidance. PubMed: Comment on "Emergence and fate of cyclic volatile polydimethylsiloxanes (D4, D5) in municipal waste streams: release mechanisms, partitioning and persistence in air, water, soil and sediments". PubMed: Organophosphate flame retardants and organosiloxanes in predatory freshwater fish from locations across Canada. PubMed: Solvation force simulations in atomic force microscopy. PubMed: Determination of soil-water sorption coefficients of volatile methylsiloxanes. PubMed: Siloxanes removal from biogas by a lab-scale biotrickling filter inoculated with Pseudomonas aeruginosa S240. PubMed: Biogas upgrading: optimal activated carbon properties for siloxane removal. PubMed: Sensitive method for quantification of octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in end-exhaled air by thermal desorption gas chromatography mass spectrometry. PubMed: Allometric relationships to liver tissue concentrations of cyclic volatile methyl siloxanes in Atlantic cod. PubMed: Absorption of a linear (L2) and a cyclic (D4) siloxane using different oils: application to biogas treatment. PubMed: Relevance of an organic solvent for absorption of siloxanes. PubMed: Concentrations and trophic magnification of cyclic siloxanes in aquatic biota from the Western Basin of Lake Erie, Canada. PubMed: Consistency in trophic magnification factors of cyclic methyl siloxanes in pelagic freshwater food webs leading to brown trout. PubMed: Concentrations of cyclic volatile methylsiloxanes in European cosmetics and personal care products: prerequisite for human and environmental exposure assessment. PubMed: Improving the efficiency of quantitative (1)H NMR: an innovative external standard-internal reference approach. PubMed: Emergence and fate of cyclic volatile polydimethylsiloxanes (D4, D5) in municipal waste streams: release mechanisms, partitioning and persistence in air, water, soil and sediments. PubMed: Atomic force microscopy of confined liquids using the thermal bending fluctuations of the cantilever. PubMed: Composition and source identification of deposits forming in landfill gas (LFG) engines and effect of activated carbon treatment on deposit composition. PubMed: Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test. PubMed: Pharmacodynamic models: parameterizing the hill equation, Michaelis-Menten, the logistic curve, and relationships among these models. PubMed: Cyclic siloxanes in air, including identification of high levels in Chicago and distinct diurnal variation. PubMed: Calibration and application of a passive air sampler (XAD-PAS) for volatile methyl siloxanes. PubMed: Selected ion flow tube studies of several siloxanes. PubMed: Evaluating the fate and behaviour of cyclic volatile methyl siloxanes in two contrasting North American lakes using a multi-media model. PubMed: Fathead minnow (Pimephales promelas) embryo to adult exposure to decamethylcyclopentasiloxane (D5). PubMed: Mechanism of diffusion slowdown in confined liquids. PubMed: Determination of cyclic volatile methylsiloxanes in water, sediment, soil, biota, and biosolid using large-volume injection-gas chromatography-mass spectrometry. PubMed: Review of recent advances in research on the toxicity, detection, occurrence and fate of cyclic volatile methyl siloxanes in the environment. PubMed: Plasma concentrations of cyclic volatile methylsiloxanes (cVMS) in pregnant and postmenopausal Norwegian women and self-reported use of personal care products (PCPs). PubMed: Determination of the dietary biomagnification of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane with the rainbow trout (Oncorhynchus mykiss). PubMed: Occurrence and seasonality of cyclic volatile methyl siloxanes in Arctic air. PubMed: Occurrence and fate of volatile siloxanes in a municipal wastewater treatment plant of Beijing, China. PubMed: Cyclic volatile methylsiloxanes in fish from the Baltic Sea. PubMed: Junge relationships in measurement data for cyclic siloxanes in air. PubMed: Concentrations of cyclic volatile methylsiloxanes in biosolid amended soil, influent, effluent, receiving water, and sediment of wastewater treatment plants in Canada. PubMed: Comprehensive mass flow analysis of Swedish sludge contaminants. PubMed: High refractive index polysiloxane as injectable, in situ curable accommodating intraocular lens. PubMed: Determination of siloxanes in silicone products and potential migration to milk, formula and liquid simulants. PubMed: Food web accumulation of cyclic siloxanes in Lake Mjøsa, Norway. PubMed: Method for simultaneous determination of partition coefficients for cyclic volatile methylsiloxanes and dimethylsilanediol. PubMed: A surprise from 1954: siloxane equilibration is a simple, robust, and obvious polymer self-healing mechanism. PubMed: Quantitative force and dissipation measurements in liquids using piezo-excited atomic force microscopy: a unifying theory. PubMed: Prioritizing organic chemicals for long-term air monitoring by using empirical monitoring data--application to data from the Swedish screening program. PubMed: Cyclic volatile methylsiloxane bioaccumulation in flounder and ragworm in the Humber Estuary. PubMed: Confinement-dependent damping in a layered liquid. PubMed: Unraveling the properties of octamethylcyclotetrasiloxane under nanoscale confinement: atomistic view of the liquidlike state from molecular dynamics simulation. PubMed: Survey of cyclic and linear siloxanes in sediment from the Songhua River and in sewage sludge from wastewater treatment plants, Northeastern China. PubMed: Determination of cyclic volatile methylsiloxanes in biota with a purge and trap method. PubMed: Nonlinear rheology of a nanoconfined simple fluid. PubMed: Volatile siloxanes in the European arctic: assessment of sources and spatial distribution. PubMed: High-resolution friction force microscopy under electrochemical control. PubMed: Occurrence of cyclic and linear siloxanes in indoor dust from China, and implications for human exposures. PubMed: Do epitaxy and temperature affect oscillatory solvation forces? PubMed: Functionalised polysiloxanes as injectable, in situ curable accommodating intraocular lenses. PubMed: Dissipation and oscillatory solvation forces in confined liquids studied by small-amplitude atomic force spectroscopy. PubMed: Quantitative analysis of volatile methylsiloxanes in waste-to-energy landfill biogases using direct APCI-MS/MS. PubMed: Siloxane treatment by adsorption into porous materials. PubMed: Direct analysis of volatile methylsiloxanes in gaseous matrixes using atmospheric pressure chemical ionization-tandem mass spectrometry. PubMed: Effect of ozone and relative humidity on the heterogeneous uptake of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane on model mineral dust aerosol components. PubMed: Low molecular weight cyclic volatile methylsiloxanes in cosmetic products sold in Canada: implication for dermal exposure. PubMed: Temperature dependence of solvation forces as measured in atomic force microscopy. PubMed: Drainage of a nanoconfined simple fluid: rate effects on squeeze-out dynamics. PubMed: Biological removal of siloxanes from landfill and digester gases: opportunities and challenges. PubMed: A mechanistic study of cyclic siloxane pyrolyses at low pressures. PubMed: Flow injection potentiometric determination of paraquat in formulations and biological samples. PubMed: [Analysis of the volatile oils chemical constituents of roots of Actinidia deliciosa]. PubMed: Inhalation dosimetry modeling with decamethylcyclopentasiloxane in rats and humans. PubMed: Are highly lipophilic volatile compounds expected to bioaccumulate with repeated exposures? PubMed: Survey of organosilicone compounds, including cyclic and linear siloxanes, in personal-care and household products. PubMed: Assessing kinetic determinants for metabolism and oral uptake of octamethylcyclotetrasiloxane (D4) from inhalation chamber studies. PubMed: Effect of tip size on force measurement in atomic force microscopy. PubMed: In vitro and in vivo percutaneous absorption of 14C-octamethylcyclotetrasiloxane (14C-D4) and 14C-decamethylcyclopentasiloxane (14C-D5). PubMed: Physiologically based pharmacokinetic modeling of the disposition of octamethylcyclotetrasiloxane (D4) migration from implants in humans. PubMed: Modeling of human dermal absorption of octamethylcyclotetrasiloxane (D(4)) and decamethylcyclopentasiloxane (D(5)). PubMed: Effects of octamethylcyclotetrasiloxane (D4) on the luteinizing hormone (LH) surge and levels of various reproductive hormones in female Sprague-Dawley rats. PubMed: Surface melting of octamethylcyclotetrasiloxane confined in controlled pore glasses: curvature effects observed by 1H NMR. PubMed: An inhalation reproductive toxicity study of octamethylcyclotetrasiloxane (D4) in female rats using multiple and single day exposure regimens. PubMed: A two-generation reproductive toxicity study of octamethylcyclotetrasiloxane (D4) in rats exposed by whole-body vapor inhalation. PubMed: Recent progress in the determination of solid surface tensions from contact angles. PubMed: In vitro and in vivo evaluation of the estrogenic, androgenic, and progestagenic potential of two cyclic siloxanes. PubMed: NMR cryoporometry with octamethylcyclotetrasiloxane as a probe liquid. Accessing large pores. PubMed: Effect of octamethylcyclotetrasiloxane on methylation of bismuth by Methanosarcina barkeri. PubMed: Density functional theory calculation of (29)Si NMR chemical shifts of organosiloxanes. PubMed: Diagnosing inborn errors of lipid metabolism with proton nuclear magnetic resonance spectroscopy. PubMed: Oscillatory dissipation of a simple confined liquid. PubMed: Discrete solvation layering in confined binary liquids. PubMed: Interpretation of contact angle measurements on two different fluoropolymers for the determination of solid surface tension. PubMed: How confined lubricants diffuse during shear. PubMed: Contact angle measurements with liquids consisting of bulky molecules. PubMed: Octamethylcyclotetrasiloxane exhibits estrogenic activity in mice via ERalpha. PubMed: The measurement of conformational stability of proteins adsorbed on siloxanes. PubMed: Physiological modeling of inhalation kinetics of octamethylcyclotetrasiloxane in humans during rest and exercise. PubMed: PBPK modeling advances understanding of D4 pharmacokinetics. PubMed: Determination of siloxanes, silicon, and platinum in tissues of women with silicone gel-filled implants. PubMed: Route-specific differences in distribution characteristics of octamethylcyclotetrasiloxane in rats: analysis using PBPK models. PubMed: Further comments on the bioavailability of D4. PubMed: Bioavailability of D4 after inhalation and implantation exposure to silicones. PubMed: Percutaneous absorption studies of octamethylcyclotetrasiloxane using the human skin/nude mouse model. PubMed: Dose-response modeling of cytochrome p450 induction in rats by octamethylcyclotetrasiloxane. PubMed: The effect of cyclic swelling (octamethylcyclotetrasiloxane) on the physical properties of silicone breast implant shells. PubMed: Effect of interfacial liquid structuring on the coherence length in nanolubrication. PubMed: Inhalation toxicology of octamethylcyclotetrasiloxane (D4) following a 3-month nose-only exposure in Fischer 344 rats. PubMed: Study of the advancing and receding contact angles: liquid sorption as a cause of contact angle hysteresis. PubMed: Bioavailability of octamethylcyclotetrasiloxane (D(4)) after exposure to silicones by inhalation and implantation. PubMed: The transport of octamethylcyclotetrasiloxane (D4) and polydimethylsiloxane (PDMS) in lightly cross-linked silicone rubber. PubMed: Potential estrogenic and antiestrogenic activity of the cyclic siloxane octamethylcyclotetrasiloxane (D4) and the linear siloxane hexamethyldisiloxane (HMDS) in immature rats using the uterotrophic assay. PubMed: Repeated inhalation exposure to octamethylcyclotetrasiloxane produces hepatomegaly, transient hepatic hyperplasia, and sustained hypertrophy in female Fischer 344 rats in a manner similar to phenobarbital. PubMed: Physiological modeling reveals novel pharmacokinetic behavior for inhaled octamethylcyclotetrasiloxane in rats. PubMed: Determination of low molecular weight silicones in plasma and blood of women after exposure to silicone breast implants by GC/MS. PubMed: Permeation of substituted silanes and siloxanes through selected gloves and protective clothing. PubMed: Genetic toxicity evaluation of octamethylcyclotetrasiloxane. PubMed: Induction of rat hepatic drug metabolizing enzymes by dimethylcyclosiloxanes. PubMed: Disposition of radioactivity in fischer 344 rats after single and multiple inhalation exposure to [(14)C]Octamethylcyclotetrasiloxane ([(14)C]D(4)). PubMed: Toxicology and humoral immunity assessment of octamethylcyclotetrasiloxane (D4) following a 28-day whole body vapor inhalation exposure in Fischer 344 rats. PubMed: Identification of metabolites of octamethylcyclotetrasiloxane (D(4)) in rat urine. PubMed: Microbial degradation of octamethylcyclotetrasiloxane. PubMed: Cyclosiloxanes produce fatal liver and lung damage in mice. PubMed: Acute respiratory exposure of human volunteers to octamethylcyclotetrasiloxane (D4): absence of immunological effects. PubMed: Quantitative exposure of humans to an octamethylcyclotetrasiloxane (D4) vapor. PubMed: Protein denaturation induced by cyclic silicone. PubMed: Drug microencapsulation by PLA/PLGA coacervation in the light of thermodynamics. 2. Parameters determining microsphere formation. PubMed: Evaluation of octamethylcyclotetrasiloxane (D4) as an inducer of rat hepatic microsomal cytochrome P450, UDP-glucuronosyltransferase, and epoxide hydrolase: a 28-day inhalation study. PubMed: Low molecular weight silicones are widely distributed after a single subcutaneous injection in mice. PubMed: Extraction of octamethylcyclotetrasiloxane and its metabolites from biological matrices. PubMed: Force-distance curves by AFM. A powerful technique for studying surface interactions. PubMed: Silicone gel and octamethylcyclotetrasiloxane (D4) enhances antibody production to bovine serum albumin in mice. PubMed: Cytotoxicity and membrane damage in vitro by inclusion complexes between gamma-cyclodextrin and siloxanes. PubMed: Silicone gel and octamethylcyclotetrasiloxane potentiate antibody production to bovine serum albumin in mice. PubMed: The adjuvancy of silicones: dependency on compartmentalization. PubMed: Induction of type II collagen arthritis in the DA rat using silicone gels and oils as adjuvant. PubMed: The effect of molecular weight and gel preparation on humoral adjuvancy of silicone oils and silicone gels. PubMed: Octamethylcyclotetrasiloxane in aquatic sediments: toxicity and risk assessment. PubMed: Ocular toxicity of low-molecular-weight components of silicone and fluorosilicone oils. PubMed: Use of plasma polymerization for preparing silicone-coated membranes for possible use in blood oxygenators.