The methyl esters of methacrylic acid that polymerize easily and are used as tissue cements, dental materials, and absorbent for biological substances.
Inorganic compounds that contain tin as an integral part of the molecule.
Organelles of phototrophic bacteria which contain photosynthetic pigments and which are formed from an invagination of the cytoplasmic membrane.
Exclusive legal rights or privileges applied to inventions, plants, etc.
Derivatives and polymers of styrene. They are used in the manufacturing of synthetic rubber, plastics, and resins. Some of the polymers form the skeletal structures for ion exchange resin beads.
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
The process by which ELECTRONS are transported from a reduced substrate to molecular OXYGEN. (From Bennington, Saunders Dictionary and Encyclopedia of Laboratory Medicine and Technology, 1984, p270)
The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
Polymeric materials (usually organic) of large molecular weight which can be shaped by flow. Plastic usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A plastic substance deposited by insects or obtained from plants. Waxes are esters of various fatty acids with higher, usually monohydric alcohols. The wax of pharmacy is principally yellow wax (beeswax), the material of which honeycomb is made. It consists chiefly of cerotic acid and myricin and is used in making ointments, cerates, etc. (Dorland, 27th ed)
A gas that has been used as an aerosol propellant and is the starting material for polyvinyl resins. Toxicity studies have shown various adverse effects, particularly the occurrence of liver neoplasms.
A mixture of solid hydrocarbons obtained from petroleum. It has a wide range of uses including as a stiffening agent in ointments, as a lubricant, and as a topical anti-inflammatory. It is also commonly used as an embedding material in histology.
Coating with a metal or alloy by electrolysis.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
Sulfur compounds in which the sulfur atom is attached to three organic radicals and an electronegative element or radical.
Manufacturing technology for making microscopic devices in the micrometer range (typically 1-100 micrometers), such as integrated circuits or MEMS. The process usually involves replication and parallel fabrication of hundreds or millions of identical structures using various thin film deposition techniques and carried out in environmentally-controlled clean rooms.
Characteristics or attributes of the outer boundaries of objects, including molecules.
A novel composition, device, or process, independently conceived de novo or derived from a pre-existing model.
The valve between the left ventricle and the ascending aorta which prevents backflow into the left ventricle.
Flaps of tissue that prevent regurgitation of BLOOD from the HEART VENTRICLES to the HEART ATRIA or from the PULMONARY ARTERIES or AORTA to the ventricles.
The valve between the left atrium and left ventricle of the heart.
Pathological conditions involving any of the various HEART VALVES and the associated structures (PAPILLARY MUSCLES and CHORDAE TENDINEAE).
A device that substitutes for a heart valve. It may be composed of biological material (BIOPROSTHESIS) and/or synthetic material.
A pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the AORTIC VALVE. It is characterized by restricted outflow from the LEFT VENTRICLE into the AORTA.
Conical muscular projections from the walls of the cardiac ventricles, attached to the cusps of the atrioventricular valves by the chordae tendineae.
The methyl ester of methacrylic acid. It polymerizes easily to form POLYMETHYL METHACRYLATE. It is used as a bone cement.
The sciences dealing with processes observable in nature.
Polymerized methyl methacrylate monomers which are used as sheets, moulding, extrusion powders, surface coating resins, emulsion polymers, fibers, inks, and films (From International Labor Organization, 1983). This material is also used in tooth implants, bone cements, and hard corneal contact lenses.
All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.
A biocompatible polymer used as a surgical suture material.
Extracellular vesicles generated by the shedding of CELL MEMBRANE blebs.
Small uniformly-sized spherical particles, of micrometer dimensions, frequently labeled with radioisotopes or various reagents acting as tags or markers.
Relating to the size of solids.
Techniques and strategies which include the use of coding sequences and other conventional or radical means to transform or modify cells for the purpose of treating or reversing disease conditions.
DNA molecules capable of autonomous replication within a host cell and into which other DNA sequences can be inserted and thus amplified. Many are derived from PLASMIDS; BACTERIOPHAGES; or VIRUSES. They are used for transporting foreign genes into recipient cells. Genetic vectors possess a functional replicator site and contain GENETIC MARKERS to facilitate their selective recognition.
The introduction of functional (usually cloned) GENES into cells. A variety of techniques and naturally occurring processes are used for the gene transfer such as cell hybridization, LIPOSOMES or microcell-mediated gene transfer, ELECTROPORATION, chromosome-mediated gene transfer, TRANSFECTION, and GENETIC TRANSDUCTION. Gene transfer may result in genetically transformed cells and individual organisms.
Dosage forms of a drug that act over a period of time by controlled-release processes or technology.
Systems for the delivery of drugs to target sites of pharmacological actions. Technologies employed include those concerning drug preparation, route of administration, site targeting, metabolism, and toxicity.
Chemistry dealing with the composition and preparation of agents having PHARMACOLOGIC ACTIONS or diagnostic use.
Established cell cultures that have the potential to propagate indefinitely.
The application of scientific knowledge or technology to pharmacy and the pharmaceutical industry. It includes methods, techniques, and instrumentation in the manufacture, preparation, compounding, dispensing, packaging, and storing of drugs and other preparations used in diagnostic and determinative procedures, and in the treatment of patients.
A dipolar ionic buffer.
A chemical system that functions to control the levels of specific ions in solution. When the level of hydrogen ion in solution is controlled the system is called a pH buffer.
Measuring instruments for determining the temperature of matter. Most thermometers used in the field of medicine are designed for measuring body temperature or for use in the clinical laboratory. (From UMDNS, 1999)
A quantitative measure of the frequency on average with which articles in a journal have been cited in a given period of time.
Liquids transforming into solids by the removal of heat.
A publication issued at stated, more or less regular, intervals.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Effect of ferric chloride/citric acid/phosphoric acid conditioner on adhesion of 4-META/MMA-TBB resin to the tooth. (1/275)

The aim of this study was to examine the effects of ferric chloride/citric acid/phosphoric acid conditioners on the surface morphology of enamel and dentin and on the adhesion of 4-META/MMA-TBB resin to conditioned tooth surfaces. Seven conditioners, including phosphoric acid and its mixture with citric acid and ferric chloride, were prepared and used for treating bovine teeth before bonding with the resin. The effects of the conditioners on the surface morphology and adhesion were examined by scanning electron microscopy and by atomic force microscopy and by tensile bond strength tests, respectively. The maximum bond strengths to tooth surfaces were obtained by using 3% ferric chloride/5% citric acid/10% phosphoric acid conditioner. Thus, enamel and dentin can be treated simultaneously with this conditioner before bonding with the 4-META/MMA-TBB resin system.  (+info)

Transarterial embolization with HEMA-MMA of variant convexity-superior sagittal sinus dural arteriovenous fistula--case report. (2/275)

A 62-year-old male presented with a variant dural arteriovenous fistula (DAVF) within the wall of the convexity-superior sagittal sinus, fed by branches of the bilateral external carotid arteries and only cortical venous drainage despite the presence of a patent sinus. Transarterial embolization with poly(2-hydroxyethyl methacrylate-co-methyl methacrylate) (HEMA-MMA) was performed, resulting in complete obliteration of the DAVF. Embolization with HEMA-MMA is an effective and safe procedure for the treatment of DAVF.  (+info)

Splinting teeth--a review of methodology and clinical case reports. (3/275)

Splinting teeth to each other allows weakened teeth to be supported by neighbouring teeth, although the procedure can make oral hygiene procedures difficult. Several methods for splinting teeth, both extracoronal and intracoronal, as well as the materials commonly used for splinting, are described and illustrated. Two case reports are used to demonstrate the situations in which splinting might be appropriate.  (+info)

Addition of antibacterial agents to MMA-TBB dentin bonding systems--influence on tensile bond strength and antibacterial effect. (4/275)

To produce a bonding system which has both high bond strength and antibacterial properties, an antibacterial agent (vancomycin: VCM or metronidazol: MN) was added to the PMMA powder of 4-META/MMA-TBB resin (CB). The influence of the addition of an antibacterial agent on tensile bond strength to dentin and the antibacterial effect were investigated in this study. Forty-seven freshly extracted bovine first or second incisors were used to measure the tensile bond strength to dentin. The bond strengths to bovine dentin were not significantly decreased by addition of VCM (1%, 2%, 5%), or MN (1%) to CB (p < 0.05). The antibacterial effect of CB containing antibacterial agent on six strains of bacteria was investigated by the agar plate diffusion method, analyzing the appearance of the inhibition zone around a resin disk following anaerobic culturing. The resin disks containing VCM showed antibacterial effects on all of the strains examined; the widths of the inhibition zones were 4-15 mm. The resin disks containing MN showed antibacterial effects on three strains; the widths of the inhibition zones were 0-4 mm. It was thus possible to produce a bonding system with both antibacterial effect and high tensile bond strength by addition of VCM to PMMA powder.  (+info)

Effect of the adhesive layer thickness on the fracture toughness of dental adhesive resins. (5/275)

We investigated how the thickness of an adhesive layer between two Co-Cr alloy plates affected the mode I fracture toughness of dental adhesive resin by varying the type of resin using a double cantilever beam (DCB) test. Two typical adhesive resins (PV and SB) were used. The adhesive layers of the DCB test specimens were 20, 100 and 200 microns thick. The fracture modes of PV differed with the thickness of the adhesive layer, such as interface fracture at 20 microns thickness, and similar cohesive fracture at 100 and 200 microns thickness. In the case of SB, crack-propagating areas were observed as cohesive fractures in all test specimens with different adhesive layer thickness, and the surfaces of these areas became remarkably rougher as the thickness of the adhesive layer increased. The fracture toughness of PV was not affected by the differences in thickness between the 100 and 200 microns adhesive layers, but there was a notable decrease in fracture toughness when the adhesive layer decreased to a thickness of 20 microns. That of SB showed a tendency to increase as the adhesive layer became thicker.  (+info)

Restoration of endodontically treated teeth with carbon fibre posts--a prospective study. (6/275)

BACKGROUND: A prospective study was started in 1995 to evaluate the success of carbon fibre reinforced epoxy resin (CFRR) posts used to restore endodontically treated teeth. All the teeth in the study had lost more than 50% of their coronal structure. METHODS: Fifty-nine carbon fibre Composiposts cemented with Metabond and built up with Core Paste cores were placed into the teeth of 47 patients. Each tooth received a full-coverage restoration (porcelain fused to metal crown) and was followed for 6.7-45.4 months (average = 28.0 months, standard deviation = 10.7). RESULTS: Results for 52 teeth in 42 patients were analyzed. There were no fractures. The overall failure rate was 7.7% and the cumulative survival rate was 89.6% at the end of the follow-up period. The only statistically significant finding (p = 0.04) was that posts in lower premolars were at higher risk of failure. CONCLUSION: CFRR posts are among the most predictable systems available today. CFRR posts in the upper anterior teeth are associated with a higher success rate and longer life than those placed in premolars, especially lower premolars. This study contributes to the growing body of evidence that supports the use of CFRR posts in the restoration of endodontically treated teeth.  (+info)

Serotonin increases the incidence of primary afferent-evoked long-term depression in rat deep dorsal horn neurons. (7/275)

5-hydroxytryptamine (5-HT) is released in spinal cord by descending systems that modulate somatosensory transmission and can potently depress primary afferent-evoked synaptic responses in dorsal horn neurons. Since primary afferent activity-induced long-term potentiation (LTP) may contribute to central sensitization of nociception, we studied the effects of 5-HT on the expression of sensory-evoked LTP and long-term depression (LTD) in deep dorsal horn (DDH) neurons. Whole cell, predominantly current clamp, recordings were obtained from DDH neurons in transverse slices of neonatal rat lumbar spinal cord. The effect of 5-HT on dorsal-root stimulation-evoked synaptic responses was tested before, during, or after high-frequency conditioning stimulation (CS). In most cells (80%), 5-HT caused a depression of the naive synaptic response. Even though 5-HT depressed evoked responses, CS in the presence of 5-HT was not only still capable of inducing LTD but also increased its incidence from 54% in controls to 88% (P < 0.001). Activation of ligands selective for 5-HT(1A/1B) and 5-HT(1B), but not 5-HT(2A/2C) or 5-HT(3) receptors, best reproduced these actions. 5-HT also potently depressed postconditioning synaptic responses regardless of whether the induced plasticity was LTP or LTD. Our results demonstrate that in addition to depressing the amplitude of evoked sensory input, 5-HT can also control the direction of its long-term modifiability, favoring the expression of LTD. These findings demonstrate cellular mechanisms that may contribute to the descending serotonergic control of nociception.  (+info)

XPS study on the weakest zone in the adhesion structure between resin containing 4-META and precious metal alloys treated with different surface modification methods. (8/275)

Three precious metal alloys, Type IV gold alloy, 14 K gold alloy, and silver-based alloy, were treated with different surface modifications including a metal primer (VBATDT) application, a SiOx coating method, high-temperature oxidation, modification method with a liquid Ga-Sn alloy, and tin electroplating. Then thin PMMA films were bonded with a resin containing 4-META. Water durability at the adhesion interface was evaluated after water immersion, followed by thermal cycling used liquid nitrogen. The weakest zone at the interface was investigated using XPS only for the Ag-Pd alloy specimens that had been surface-treated with as-polishing, adhesive primer, and the SiOx coating method, since peeling of the PMMA film on the surface of specimens surface-treated by other methods was not observed. Metal elements were detected from the resin side at the adhesion interface. The chemical states of Cu in the resin before argon ion etching were characterized as metal oxides and/or states of chemical interaction with 4-META, VBATDT, or SiOx.  (+info)

Compositions are provided that that can be used as an initiator system for free radical polymerization reactions. More specifically, the initiator systems include an electron acceptor and an electron donor. The electron donors are arylsulfinate salts having a cation that contains at least one carbon atom and either a positively charged nitrogen atom or a positively charged phosphorus atom. Methods of polymerization are also provided that can be used to prepare polymeric material with the initiator systems. The initiator systems can be thermal initiator systems, photoinitiator systems, or combinations thereof.
ethylene glycol dimethacrylate 97-90-5 safety info, ethylene glycol dimethacrylate chemical safety search, Chemical ethylene glycol dimethacrylate safety technical specifications ect.
Reactive continuous rods of macroporous poly(glycidyl methacrylate-co-ethylene dimethacrylate) were prepared within the confines of a stainless steel column. Then papain was immobilized on these monoliths either directly or linked by a spacer arm. In a further step, a protein A affinity column was used for the characterization of the digestion products of human immunoglobulin G (IgG) by papain. The results showed that papain immobilized on the monolithic rod through a spacer arm exhibits higher activity for the digestion of human IgG than that without a spacer arm. The apparent Michaelis-Menten kinetic constants of free and immobilized papain, K-m and V-max, were determined. The digestion conditions of human IgG with free and immobilized papain were optimized. Comparison of the thermal stability of free and immobilized papain showed that the immobilized papain exhibited higher thermal stability than the free enzyme. The half-time of immobilized papain reaches about a week under optimum pH and ...
[65 Pages Report] Check for Discount on Ethylene Glycol Dimethacrylate Global Market and Forecast Research report by ChemReport. DescriptionWe provide independent and unbiased information on manufacturers, prices, production...
www.MOLUNA.de Novel Metathesis Chemistry: Well-Defined Initiator Systems for S [4092649] - Proceedings of the NATO Advanced Study Institute, held in Antalya, Turkey, 8-21 September 2002A comprehensive discussion of the theory, practice and application of catalytically active transition metal species and their application in the production of specialist polymeric materials. The material is presented in a progressive manner, suitable for non-experts and
The zwitterionic organopolymerization of four different acrylic monomers (N,N-dimethylacrylamide, methyl acrylate, methyl methacrylate and tert-butyl methacrylate) based on neutral initiators, so-called N-heterocyclic olefins (NHOs), is presented. Scope and underlying (deactivation-)mechanisms where studied in a combined experimental and computational effort. From a range of differently structured NHOs it emerged that imidazole-, in contrast to imidazoline- and benzimidazole-derivatives, readily polymerize the selected monomers. While the additive-free reactions proceed with a relatively low degree of control to yield largely atactic material, for the acrylamide the addition of LiCl as µ-type ligand has been shown to result in a rapid and quantitative monomer consumption. The thus generated poly(N,N-dimethyl acrylamide) was found to be highly isotactic (,90% isotactic dyads) with high molecular weight (Mn = 250 000 - 650 000 g/mol, ÐM = 1.3- 1.6). Complementing DFT calculations considered the ...
TY - JOUR AU - Marinović, Sanja AU - Milutinović Nikolić, Aleksandra AU - Nastasović, Aleksandra AU - Žunić, Marija AU - Vuković, Zorica AU - Antonovic, Dusan G AU - Jovanović, Dušan M. PY - 2014 UR - http://cer.ihtm.bg.ac.rs/handle/123456789/1408 AB - Macroporous nanocomposite of poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) and acid modified bentonite was prepared by radical suspension copolymerization. Nanocomposite was functionalized with diethylenetriamine (DETA), by ring-opening reaction of the pendant epoxy groups. Functionalization was performed in order to enable phenol derivatives sorption. This new, not sufficiently investigated material, with developed porous structure was denoted CP-S-A-DETA. In this study, the influence of temperature on 4-nitrophenol (4NP) sorption on CP-S-A-DETA was investigated. The chemisorption was estimated as dominant process since activation energy of sorption of 4NP of 54.8 kJ mol(-1) was obtained. After determining the optimal ...
A new model based on a combination of the polymeric multigrain and multilayer models has been developed to predict the polymerization rate, particle growth, morphology, effective parameters on broadening of the molecular weight distribution, number and weight average of the molecular weight, isotacticity index and bulk density of polymer. Mathematical correlations and the kinetics used in this model are based on the polymeric multigrain and the multilayer models, respectively. In the modeling, multiplicity of active site using different kinetics parameters as well as deactivation of catalyst during the polymerization have been considered,. Moreover, it considers mass transfer effects on polymerization characteristics. The Effects of physico-chemical aspects of catalyst associated with the polymerization in slurry phase are also considered in this model. In addition, the effects of more important model parameters including time step, number of layers and number of active sites on the produced polymer
Novel method of making a semi-permeable membrane having a perhalogenated olefin substrate by grafting onto such substrate acrylic acid or other hydrophilic acid groups. The grafting is accomplished by forming a grafting medium comprising water, olefinically unsaturated hydrophilic acid moiety and an inorganic polymerization inhibitor for the homopolymerization of said hydrophilic acid which is a salt of a polyvalent metal; immersing perhalogenated olefin polymer substrate in the grafting medium; and then subjecting such to ionizing radiation sufficient to cause grafting of said hydrophilic acid onto said perhalogenated olifin polymer substrate.
A complex comprises organoborane and polyamine. The polyamine is the reaction product of a diprimary amine-terminated material and a material having at least two groups reactive with primary amine. The complexes are useful in systems for initiating the polymerization of acrylic monomer, which systems further include a material reactive with amine. Polymerizable acrylic monomer compositions useful as adhesives can be prepared.
Nile Blue dye itself is a fluorescent dye that is used routinely in histology to impart a blue color to cell nuclei, where it highlights the distinction between neutral lipids (triglycerides, etc.) which are stained pink and fatty acids, which are stained
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The spatially controlled synthesis of poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolithic stationary phases in polyimide coated fused silica capillaries by visible light induced radical polymerisation using a three-component initiator and a 660 nm light emitting diode (LED) as a light source is
ACRYLIC MONOMER by UNITEK CORP Material Safety Data Sheet #BJCTV. Contains information such as responsible party, contractor, ingredients, hazards, first aid, fire fighting, accidental release, handling, exposure controls, chemical properties, stability and disposal. Save to your computer as a PDF!
One-step synthesis of methylmethacrylate (MMA) using heteropoly compounds (HPCs) as catalysts was demonstrated by feeding a mixture of methacrolein (MAL), air, water, nitrogen and MeOH (methanol)....
en] Copolymerization of binary mixtures of alkyl (meth)acrylates has been initiated in toluene by a mixed complex of lithium silanolate (s-BuMe2SiOLi) and s-BuLi (molar ratio , 21) formed in situ by reaction of s-BuLi with hexamethylcyclotrisiloxane (D3). Fully acrylate and methacrylate copolymers, i.e., poly(methyl acrylate-co-n-butyl acrylate), poly(methyl methacrylate-co-ethyl methacrylate), poly(methyl methacrylate-co-n-butyl methacrylate), poly(methyl methacrylate-co-n-butyl methacrylate), poly(isobornyl methacrylate-co-n-butyl methacrylate), poly(isobornyl methacrylate-co-n-butyl methacrylate) of a rather narrow molecular weight distribution have been synthesized. However, copolymerization of alkyl acrylate and methyl methacrylate pairs has completely failed, leading to the selective formation of homopoly(acrylate). As result of the isotactic stereoregulation of the alkyl methacrylate polymerization by the s-BuLi/s-BuMe2SiOLi initiator, highly isotactic random and block copolymers of ...
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Before conditioner inclusion open windows or the hatch on a body roof to air car salon.. With a car start of motion include the conditioner and establish a temperature regulator in position cooling.. In the beginning switch the conditioner in a mode of the most intensive cooling. After a while switch the conditioner in a mode of moderate cooling.. It is recommended to maintain temperature in salon no more than on 5 From more low ambient temperature.. It is not recommended to direct a stream of cooling air directly on a body of the passenger or the driver. It is the most reasonable to direct an air stream from final apertures of the conditioner on windshields. It will promote uniform dispersion of a stream.. The conditioner is recommended to be included not less than 1-2 times a month. At more rare inclusions tightness in junctions of hoses is broken.. Smoking is forbidden at the included conditioner as the smoke which is soaked up by the conditioner, can break evaporator work.. It is ...
A macroporous copolymer of glycidyl methacrylate and ethylene glycol dimethacrylate, poly(GMA-co-EGDMA), with various surface characteristics and mean pore size diameters ranging from 44 to 200 nm was synthesized, modified with 1,2-diaminoethane, and tested as a carrier for immobilization of horseradish peroxidase (HRP) by two covalent methods, glutaraldehyde and periodate. The highest specific activity of around 35 U g(-1) dry weight of carrier was achieved on poly(GMA-co-EGDMA) copolymers with mean pore diameters of 200 and 120 nm by the periodate method. A study of deactivation kinetics at 65 A degrees C and in 80 % dioxane revealed that periodate immobilization also produced an appreciable stabilization of the biocatalyst, while stabilization factor depended strongly on the surface characteristics of the copolymers. HRP immobilized on copolymer with a mean pore diameter of 120 nm by periodate method showing not only the highest specific activity but also good stability was further ...
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Copolymers of glycidyl methacrylate and allyl glycidyl ether having pendant epoxy groups, having an inherent viscosity of at least about 0.25, preferably within the range of about 0.25 to about 0.38, and an epoxy equivalent of at least about 0.65 epoxide equivalent per 100 g. of polymer are provided which upon admixture with a radiation-sensitive aryldiazonium salt provide compositions which exhibit improved sensitivity, curing rates and other properties. Articles for recording and storing information from a laser source and other articles such as microfilm are derived from such compositions by subjecting a coated substrate to an energy source of sufficient intensity to decompose the radiation-sensitive catalyst and thus effect polymerization via the epoxy groups of the copolymer.
We present in this category the monomers used for biomaterials research classified according to their chemical structures such as acrylic monomers, lactone monomers, dithiol monomers, and diisocyanate monomers. Among them acrylic monomers contain largest number of products and are often utilized for biomaterials or biocompatible materials research, using conventional radical polymerization or controlled radical polymerization. In addition to the common monomers for biomaterials research including 2-hydroxyethyl methacrylate (HEMA) [M0085]1) and N-isopropylacrylamide (NIPAAm) [I0401]2), TCI has zwitterionic monomers or monomers with reactive functional groups useful for conjugation with proteins or peptides present in our catalog. Zwitterionic monomers contain both cationic and anionic groups in the same molecule. Common zwitterionic monomer structures include phosphobetaines, sulfobetaines, and carboxybetaines.3,4) One of the phosphobetaine zwitterionic monomers, 2-(methacryloyloxy)ethyl 2-
Poly(styrene co-divinylbenzene) (PS-DVB) monolithic pre-columns of 50 μm inner diameter (ID) were developed for peptides and small molecules enrichment intended for use in automated miniaturized liquid chromatography-mass spectrometry (LC-MS) column switching system as alternative to 50 μm ID poly(butyl methacrylate-co-ethylene dimethacrylate) (BMA-EDMA) monoliths. Monomer/porogen ratio, percentage of good solvent, polymerization temperature, and polymerization time, and thermal initiator, were investigated in order to optimise the monolithic structure with a high surface area and good permeability. The efficiency was measured on 10 cm long column using a simple liquid chromatography ultraviolet (LC-UV) test system with toluene as the test analyte. In general, increasing polymerization temperature lead to a monolith with a higher number of small pores and backpressure. A ratio of 40/60 between monomers and porogens was required for a full structure of monolith. The columns made with LP yielded ...
Great Lakes Dental Technologies (formerly Great Lakes Orthodontics) is an employee owned company, with over 270 employee-owners who design, develop and manufacture products for the orthodontic, dental, and sleep/airway markets.
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Universally indicated for all indirect applications, NX3 Nexus Third Generation is a permanent adhesive dental cement system with an innovative chemistry for unmatched esthetics, adhesion and great versatility. Delivery system choices include an automix syringe for dual-cure indications and a light-cure cement for multiple units where unlimited work time is needed. The automixing dual-cure cement can be used for all indirect applications, including veneers. With Kerrs proprietary amine-free initiator system and optimized resin matrix, NX3 is the first truly color-stable adhesive resin cement.. NX3 Nexus Third Generation earned Dental Advisor Preferred Product Awards for 2010, 2011, and 2012!. ...
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A novel sorbent, glycidyl methacrylate (GMA)-methyl methacrylate (MMA)-divinylbenzene (DVB) terpolymer functionalized with diethylenetriamine tetraacetic acid (DTTA), has been used for the sorption and preconcentration of Hg2+ from waters prior to its determination by inductively coupled plasma mass spectrometry. Various parameters such as solution pH, contact time, and sorbent amount were studied. Optimum sorption conditions were determined as pH of 7, contact time of 60 minutes, and sorbent amount/solution volume ratio of 1.5mgmL(-1). Batch-type equilibration studies have shown that the novel sorbent can be employed at a pH range resulting in quantitative sorption (>95%) at pH 4.0-8.0. For the quantitative elution of Hg2+ from the sorbent, 1.0M HCl was used. Langmuir isotherm model was found to characterize the uptake of Hg2+ by the novel sorbent. In addition, it was observed that the sorbent effectively removed Hg2+ ion even in the presence of several competitor ions (Pb2+, Cu2+, Zn2+, Fe3+, ...
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There is an increasing demand for new materials in biomedical applications with material properties that are highly specific for each application area. The search for new materials requires the creation of materials with suitable mechanical properties, functionalities, three-dimensional structures and a controlled degradation profile. The focus of the work described in this thesis has been on the synthesis of functional degradable aliphatic polyesters, on the design of porous scaffolds and on their synthesis with bio-safe catalyst/initiator systems. An unsaturated aliphatic polyester has been synthesized by condensation polymerization to produce poly(but-2-ene-1,4-diyl malonate) (PBM), which was applicable as a cross-linked network and as a macro-co-initiator for the ring-opening polymerization (ROP) of cyclic ester monomers. The method of preparation of PBM was simple and straightforward and there was no need to purify the monomers or add a catalyst. PBM was successfully cross-linked with ...
Photopolymerizable compositions are described containing a polymerizable ethylenically unsaturated monomer, a photoinitiator or initiator system, and selected acidic polymeric binders. The organic binder mixture contains a compound chosen from each of two selected classes. These photopolymerizable compositions yield superior processability, i.e., on developing and stripping, in solely aqueous alkaline media devoid of organic solvents, decreased softness and/or tackiness, and improved adhesion when compared to the prior art. The compositions are particularly useful for preparing photoresists.
Possible Migration and Histopathological Analysis of Injections of Polymethylmethacrylate in Wistar Rats. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Detail záznamu - Surface modification of polymethylmethacrylate irradiated with 60 fs single laser pulses - Detail záznamu - Knihovna Akademie věd České republiky
Polyimidazole Glycidyl Ether is the polymer of 1H-Imidazole with (chloromethyl)oxirane that generally conforms to the formula: (C3H5ClO • C3H4N2)X.
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The present invention relates to a silicone coating composition which, when cured on a solid substrate either by ultraviolet or electron beam radiation, provides a transparent abrasion resistant coating firmly adhered thereon. The silicon coating is prepared by reacting at least one multifunctional acrylate monomer with an amino-organofunctional silane, mixing the modified silane with at least one acrylic monomer and thereafter adding colloidal silica.
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(21) as a function 1 b, and substituting it in dD d0 b d0 b b ; 26 derivedfromthegeometryofFig. Efficacy of vacuum mixing systems in reducing methylmethacrylate fume exposure.
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Polymerization of methyl methacrylates are only controlled by ditellurides. The importance of X to chain transfer increases in ...
... methyl methacrylates), and polyurethanes. Hydrophilic, amorphous, low-molecular-weight polymers containing heteroatoms (i.e., ...
Chemical consolidants that are used in modern conservation include isocyanates, silanes, siloxnes, and methyl methacrylates, ...
... methyl methacrylates MeSH D25.720.716.822.111.650.605.450 - methyl methacrylate MeSH D25.720.716.822.111.650.605.500 - ...
... methyl methacrylates MeSH D05.750.716.822.111.650.605.450 - methyl methacrylate MeSH D05.750.716.822.111.650.605.500 - ...
Methylmethacrylates / therapeutic use * Minerals / therapeutic use * Prospective Studies * Pulp Capping and Pulpectomy Agents ...
Methylmethacrylates* / analysis * Methylmethacrylates* / pharmacokinetics* * Methylmethacrylates* / therapeutic use* Substances ...
Methylmethacrylates*. Osteogenesis. Periodontal Diseases / etiology. Periodontal Ligament / anatomy & histology. Periodontitis ... 0/Biocompatible Materials; 0/Methylmethacrylates; 0/Polymers From MEDLINE®/PubMed®, a database of the U.S. National Library of ...
Methylmethacrylates / adverse effects. Prevalence. Questionnaires. Resins, Synthetic / adverse effects. Soaps / adverse effects ... 0/Composite Resins; 0/Dental Materials; 0/Dentin-Bonding Agents; 0/Latex; 0/Methacrylates; 0/Methylmethacrylates; 0/Resins, ...
Methylmethacrylates. 2. 1988. 77. 0.180. Why? Flavonols. 1. 2017. 66. 0.180. Why? ...
Polymerization of methyl methacrylates are only controlled by ditellurides. The importance of X to chain transfer increases in ...
... methylmethacrylates), such as the material sold under the trademark, PLEXIGLAS; and polymerizates of a polyol(allyl carbonate) ...
Some common examples of plastics are the polyethylenes, polystyrenes, vinyl polymers, methyl methacrylates, and polyesters. ...
R. Lovell and A. H. Windel, Structure of noncrystalline isotactic poly(methyl methacrylates). Evidence against double helices, ...
Methylmethacrylates. S. el-Kheshen, Zia, H., Badawi, A., Needham, T. E., and Luzzi, L. A., "Coating charcoal with polyacrylate- ...
Such other monomers include e.g. substituted and unsubstituted styrenes, diphenyl methylmethacrylates, 2-adamantylmethyl ...
Occlusal Disharmonies after Processing Heat Cured Poly Methyl Methacrylates. Occlusal disharmonies after processing complete ... Occlusal Disharmonies after Processing Heat Cured Poly Methyl Methacrylates Occlusal disharmonies after processing comple te ... Occlusal Disharmonies after Processing Heat Cured Poly Methyl Methacrylates.................15. Obj ective of Study ... 13 Occlusal Disharmonies after Processing H eat Cured Poly Methyl Methacrylates.................15 Objective of Study ...
Electrical, Optical and Doppler Broadening Spectroscopy Studies of Poly Methyl Methacrylates Acid/Multiwalled Carbon Nanotube ...
... poly-methyl methacrylates, and other similar materials. Moreover, each of these compositions potentially may be configured from ...
Structural adhesive technologies include epoxies, acrylics, methylmethacrylates (MMAs), modified silanes and polyurethanes. ...
Methylmethacrylates/pharmacology. MESH. Mice. MESH. Protein Biosynthesis. MESH. Dewey Decimal Classification:. 600 Technology ...
... the worlds largest manufacturer of methyl methacrylates. Methacrylate polymers are found in a wide range of products including ...
In contrast to the polymers disclosed in this application, the brominated poly(methyl methacrylates) do not degrade. However, ... 0013] Kraft et al., Biomater., 18, 31-36 (1997), discloses the preparation of radio-opaque iodine-containing poly(methyl methacrylates ...
... acrylic or polyester resins such as methyl methacrylates. Other biocompatible materials such as Ormocere®, polyimides or ...
Vinyl monomers such as styrene, methyl methacrylates, and the like are particularly suited for this last-mentioned purpose. ...
... methyl methacrylates), poly(ethyl methacrylates), poly(butyl methacrylate), poly(isobutyl methacrylate), poly(hexl methacrylate ...
... methyl methacrylates), poly(ethyl methacrylates), poly(butylmethacrylate), poly (isobutyl methacrylate), poly ( ...
Tablets coated with poly(vinyl alcohol) and poly(methacrylate-methylmethacrylates) showed the lowest moisture uptake rates ( ... methacrylate-methylmethacrylates). The water content of the tablets during coating and during storage at different temperatures ...
Polymerization of methyl methacrylates are only controlled by ditellurides. The importance of X to chain transfer increases in ...
Hearing aids made of rubber, vinyl plastics, or methylmethacrylates or chemicals used to clean hearing aids may be the ...
... methyl methacrylates), poly(ethyl methacrylates), poly(butylmethacrylate), poly(isobutyl methacrylate), poly(hexylmethacrylate ...
... methylmethacrylates), ethylene ethylacrylates, poly(ethyl hexylacrylates), plasticized ethylene vinylacetates, poly(vinyl ...
An anionic copolymer based on methacrylic acid and methyl methacrylates was used for the coating of tablets and pills which ...

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