This is accomplished by moving the x-ray tube in the opposite direction from the imaging device around a stationary fulcrum defining the plane of interest. Top PET abbreviation related to Medical: Positron-emission tomography. Intrinsic viscosity is dependent upon the length of its polymer chains but has no units due to being extrapolated to zero concentration. Polyethylene Terephthalate (more common than PETE) PET. Typically, residual moisture levels in the resin must be less than 50 parts per million (parts of water per million parts of resin, by weight) before processing. In addition, with this way of processing, the possibility of a chemical decomposition of the hydro peroxides is possible by adding a corresponding P-stabilizer directly when plasticizing. Depending on its processing and thermal history, polyethylene terephthalate may exist both as an amorphous (transparent) and as a semi-crystalline polymer. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world. In dam's the ability to conceive and carry a litter. The spinning viscosity is again within a range of 0.58–0.65 dℓ/g. Bottles are easy to distinguish because of shape and consistency and separate from waste plastic streams either by automatic or by hand-sorting processes. and Bashir, Z. The motto "What the eye does not see the heart cannot grieve over" is considered to be very important in many recycling processes. Choosing the re-pelletizing way means having an additional conversion process that is, at the one side, energy-intensive and cost-consuming, and causes thermal destruction. MSD and the MSD Veterinary Manual Merck & Co., Inc., Kenilworth, NJ, USA (known as MSD outside of the US and Canada) is a global healthcare leader working to help the world be well. About 60% crystallization is the upper limit for commercial products, with the exception of polyester fibers. When filled with glass particles or fibres, it becomes significantly stiffer and more durable. E. I. DuPont de Nemours in Delaware, United States, first used the trademark Mylar in June 1951 and received registration of it in 1952. Plastic bottles made from PET are widely used for soft drinks (see carbonation). I felt fine for about a week an a half, but 2 days ago I began to sneeze a lot. The drinking water limit assessed by WHO is 20 parts per billion (WHO, 2003), and the drinking water limit in the United States is 6 parts per billion. Therefore, besides efficient sorting, the removal of visible impurity particles by melt filtration processes plays a particular part in this case. PET. Besides chemical contaminants and degradation products generated during first processing and usage, mechanical impurities are representing the main part of quality depreciating impurities in the recycling stream. However, when this "damp" PET is then heated, the water hydrolyzes the PET, decreasing its resilience. Q. Biaxially oriented PET film (often known by one of its trade names, "Mylar") can be aluminized by evaporating a thin film of metal onto it to reduce its permeability, and to make it reflective and opaque (MPET). The fact that some machine manufacturers and line builders in Europe and the United States make efforts to offer independent recycling processes, e.g. [33] Pharr Yarns, a supplier to numerous carpet manufacturers including Looptex, Dobbs Mills, and Berkshire Flooring,[34] produces a BCF (bulk continuous filament) PET carpet fiber containing a minimum of 25% post-consumer recycled content. FDG-PET is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms FDG-PET - What does FDG-PET stand for? Staple fibers are spun in an intrinsic viscosity range that lies rather somewhat lower and that should be between 0.58 and 0.62 dℓ/g. the so-called bottle-to-bottle (B-2-B) process, such as Next Generation Recycling (NGR), BePET, Starlinger, URRC or BÜHLER, aims at generally furnishing proof of the "existence" of the required extraction residues and of the removal of model contaminants according to FDA applying the so-called challenge test, which is necessary for the application of the treated polyester in the food sector. [23] ; What does PET mean? Drying is achieved through the use of a desiccant or dryers before the PET is fed into the processing equipment. At the other side, the pelletizing step is providing the following advantages: This process is, in principle, similar to the one described above; however, the pellets produced are directly (continuously or discontinuously) crystallized and then subjected to a solid-state polycondensation (SSP) in a tumbling drier or a vertical tube reactor. A positron emission tomography (PET) scan shows how organs and tissues are working. It uses a radioactive substance called a tracer to look for disease in the body. PET has been used with fludeoxyglucose F 18 to identify and localize regional lymph node metastases and to help assess response to therapy. Aluminized Mylar ballons filled with helium. The Swiss Federal Office of Public Health investigated the amount of antimony migration, comparing waters bottled in PET and glass: The antimony concentrations of the water in PET bottles were higher, but still well below the allowed maximum concentration. Computed tomographic (CT) images that are obtained as the CT table moves continuously during a single, held breath. As a result, bottles are obtainable via stretch blow molding ("SBM"), which are both clear and crystalline enough to be an adequate barrier to aromas and even gases, such as carbon dioxide in carbonated beverages. In two-step molding, two separate machines are used. It may also be referred to by the brand names Terylene in the UK,[5] Lavsan in Russia and the former Soviet Union, and Dacron in the US. My son really wants a dog and I am allergic. [citation needed], "PETE" redirects here. A medical imaging method for reconstructing sectional images of radiotracer distributions. to visualize blood flow to different regions of the brain in stroke. Although it forms naturally in some fruit, it can cause an off-taste in bottled water. The recycling of PET bottles is meanwhile an industrial standard process that is offered by a wide variety of engineering companies.[38]. Antimony also remains in the material itself and can, thus, migrate out into food and drinks. For certain specialty bottles, such as those designated for beer containment, PET sandwiches an additional polyvinyl alcohol (PVOH) layer to further reduce its oxygen permeability. You should also be able to interpret such abbreviations to make up drugs or fluids as directed by a veterinarian. I also came down with a sore throat and a bad cough. Acetaldehyde is a colorless, volatile substance with a fruity smell. Another way to improve the stability of the polymer is to use stabilizers, mainly antioxidants such as phosphites. It is a clear amorphous thermoplastic that can be injection-molded, sheet … 'President Elect Training Seminar' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource. The scan uses … Ac – before meals. Veterinary Abbreviations & Acronyms Flashcards – Quizlet Go to quizlet.com and search for veterinary abbreviations or veterinary acronyms to create flashcards. The thermal and thermooxidative degradation results in poor processibility characteristics and performance of the material. By using several different radionuclides, researchers can measure regional cerebral blood flow, blood volume, oxygen uptake, and glucose transport and metabolism, and can locate neurotransmitter receptors. With the exception of renal tomography most tomographic procedures have been replaced by computed tomography (CT). Use this list of common medical abbreviations and terminology used by doctors, medical specialists, RNs, PAs, and other health-care professionals to help you read and decipher the information on your prescriptions and doctors' medical notes. Some exceptions like BOPET-film of low thickness, special applications like optical film or yarns through FDY-spinning at > 6000 m/min, microfilaments, and micro-fibers are produced from virgin polyester only. ACTH – adrenocorticotropic hormone. The reactions are simply the reverse of those used in production. Looking for online definition of FDG-PET or what FDG-PET stands for? Used to denote 'lack of' or absence. Medical Definition of PET scan Medical Author: William C. Shiel Jr., MD, FACP, FACR PET scan: The popular name (and abbreviation) of P ositron E mission T omography . This is not such a problem for non-consumables (such as shampoo), for fruit juices (which already contain acetaldehyde), or for strong-tasting drinks like soft drinks. The WHO has published a risk assessment for antimony in drinking water. Top PET acronym definition related to defence: Performance Evaluation Tool Medical PET abbreviation meaning defined here. The images produced by PET are in colors that indicate the degree of metabolism or blood flow. In reconstruction tomography (CT and PET) the image is produced by a computer program. for roof covers or in road building—can be manufactured by spinning bottle flakes. Definition A positron emission tomography (PET) scan is an imaging test that allows your doctor to check for diseases in your body. Common causes of malnutrition are inadequate calorie consumption; inadequate intake of essential vitamins, minerals, or other micronutrients; improper absorption and distribution of foods within the body; overeating; and intoxication by nutrient excesses. PET preform for injection stretch blow moulding of a bottle. For PET we have found 422 definitions. Compressed air dryers do not reuse drying air. Accumulation of gels and long-chain branching defects. PETG can be colored during processing. Several attempts of industrial magnitude to establish such chemical recycling plants have been made in the past but without resounding success. PET can be used to study the biochemical activity of the brain. Look through 570 acronyms and abbreviations related to Veterinary: AAAP: Asian-Australasian Association of Animal Production Societies : AAAP All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. The semicrystalline material might appear transparent (particle size less than 500 nm) or opaque and white (particle size up to a few micrometers) depending on its crystal structure and particle size. Antimony (Sb) is a metalloid element that is used as a catalyst in the form of compounds such as antimony trioxide (Sb2O3) or antimony triacetate in the production of PET. An article published in Journal of Environmental Monitoring in April 2012 concludes that antimony concentration in deionized water stored in PET bottles stays within EU's acceptable limit even if stored briefly at temperatures up to 60 °C (140 °F), while bottled contents (water or soft drinks) may occasionally exceed the EU limit after less than a year of storage at room temperature.[29]. Detailed evaluation of dynamic internal features is feasible with this technique. Water is eliminated in the reaction, and it is also continuously removed by distillation:[19]. Reactive polyester OH- or COOH- end groups are transformed into dead or non-reactive end groups, e.g. It is used in the diagnosis of osteopenia and osteoporosis. Thus, the resin can be plastically formed at lower temperatures and/or with lower force. Thus, before the resin can be processed in a molding machine, it must be dried. ACT – activated clotting time. Relative position of the x-ray tube, patient, and detectors in a fourth generation CT unit. We know 422 definitions for PET abbreviation or acronym in 8 categories. [9] If crystallizable PET is used, the trays can be used for frozen dinners, since they withstand both freezing and oven baking temperatures. Finally, the cool dry air leaving the desiccant bed is re-heated in a process heater and sent back through the same processes in a closed loop. In this case, nearly all kinds of recycled-material feedback into the material circulation are possible today. In general, one can say that the processes to make PET bottle flakes from collected bottles are as versatile as the different waste streams are different in their composition and quality. Whinfield, John Rex and Dickson, James Tennant (1941) "Improvements Relating to the Manufacture of Highly Polymeric Substances", UK Patent 578,079; "Polymeric Linear Terephthalic Esters", Wyeth, Nathaniel C. "Biaxially Oriented Poly(ethylene terephthalate) Bottle", NPCS Board of Consultants & Engineers (2014) Chapter 6, p. 56 in, Gupta, V.B. With every new thermal stress, the organic foreign substances will react by decomposition. PET was patented in 1941 by John Rex Whinfield, James Tennant Dickson and their employer the Calico Printers' Association of Manchester, England. Destruction of hydro peroxides is to happen before the first thermal treatment or during plasticization and can be supported by suitable additives like antioxidants. Non-oriented PET sheet can be thermoformed to make packaging trays and blister packs. [22], Fruit juice concentrates (for which no guidelines are established), however, that were produced and bottled in PET in the UK were found to contain up to 44.7 µg/L of antimony, well above the EU limits for tap water of 5 µg/L. What kind of dogs are considered "low allergy" breeds? POSITRON EMISSION TOMOGRAPHY: PET SCAN revealing lung cancer. Possible PET meaning as an acronym, abbreviation, shorthand or slang term vary from category to category. Helpful, trusted answers from doctors: Dr. Fried on pet medical abbreviation: it is recommended that you see your doctor in 1 to 2 weeks after your abortion you ensure that the procedure has been completed and you are no longer pregnant. A later (2006) but more widely publicized study found similar amounts of antimony in water in PET bottles. In this case, too, the required viscosity can be adjusted via drying or vacuum adjustment in case of vacuum extrusion. Polyethylene terephthalate (sometimes written poly(ethylene terephthalate)), commonly abbreviated PET, PETE, or the obsolete PETP or PET-P, is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids and foods, thermoforming for manufacturing, and in combination with glass fibre for engineering resins. In one-step machines, the entire process from raw material to finished container is conducted within one machine, making it especially suitable for molding non-standard shapes (custom molding), including jars, flat oval, flask shapes, etc. [24], At least one species of bacterium in the genus Nocardia can degrade PET with an esterase enzyme. The 1,2-(ortho-) or 1,3-(meta-) linkage produces an angle in the chain, which also disturbs crystallinity. The information we get from a CBC can help us determine whether your pet may be suffering from an infection, anemia or some types of cancer. [31] While most thermoplastics can, in principle, be recycled, PET bottle recycling is more practical than many other plastic applications because of the high value of the resin and the almost exclusive use of PET for widely used water and carbonated soft drink bottling. Dry, heated compressed air is circulated through the PET pellets as in the desiccant dryer, then released to the atmosphere. Computed tomography is colloquially called a. Cross-sectional body imaging that reconstructs pictures of internal organs based on measurements of their electrical activity as detected by electrodes placed on the surface of the body. [12], In the Soviet Union, PET was first manufactured in the laboratories of the Institute of High-Molecular Compounds of the USSR Academy of Sciences in 1949, and its name "Lavsan" is an acronym thereof (лаборатории Института высокомолекулярных соединений Академии наук СССР). Hydroxide and peroxide groups build up at the surface of the products made of polyester in presence of air (oxygen) and humidity. Polyester makes up about 18% of world polymer production and is the fourth-most-produced polymer after polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). The particle size distribution of impurities is very wide, the big particles of 60–1000 µm—which are visible by naked eye and easy to filter—representing the lesser evil, since their total surface is relatively small and the degradation speed is therefore lower. Results are decreased reactivity during re-polycondensation or re-SSP and broadening the molecular weight distribution. Besides this external (post-consumer) polyester bottle recycling, numbers of internal (pre-consumer) recycling processes exist, where the wasted polymer material does not exit the production site to the free market, and instead is reused in the same production circuit. Tube movements can be linear, curvilinear, circular, elliptical, figure eight, hypocycloidal, or trispiral. High-speed spinning processes for the manufacture of POY normally need a viscosity of 0.62–0.64 dℓ/g. In April 2020, a French university announced the discovery of a highly efficient, optimized enzyme that outperforms all PET hydrolases reported so far. From A to Z, this article defines the abbreviations your veterinarian uses. [32] The prime uses for recycled PET are polyester fiber, strapping, and non-food containers.[32]. This becomes a problem when the optical requirements of the polymer are very high, such as in packaging applications. Is this a result of a pet allergy or did I just come down with a cold? Polyethylene terephthalate can be depolymerized to yield the constituent monomers. The Swiss Federal Office of Public Health concluded that small amounts of antimony migrate from the PET into bottled water, but that the health risk of the resulting low concentrations is negligible (1% of the "tolerable daily intake" determined by the WHO). The high plasticization temperature of PET in the range of 280 °C (536 °F) is the reason why almost all common organic impurities such as PVC, PLA, polyolefin, chemical wood-pulp and paper fibers, polyvinyl acetate, melt adhesive, coloring agents, sugar, and protein residues are transformed into colored degradation products that, in their turn, might release in addition reactive degradation products. In veterinary medicine, used to describe an animal that is barren or unable to successfully reproduce. An injury that has occurred in which one or more of the topmost layers of the skin are scraped away. In general, such PET is known as PETG or PET-G (polyethylene terephthalate glycol-modified). PET, like many plastics, is also an excellent candidate for thermal disposal (incineration), as it is composed of carbon, hydrogen, and oxygen, with only trace amounts of catalyst elements (but no sulfur). https://medical-dictionary.thefreedictionary.com/PET. It is strong and impact-resistant. PET has a resin identification code of 1. abscess. The destruction of the hydro peroxide groups is, with other processes, already carried out during the last step of flake treatment for instance by adding H3PO3. In this way, fiber waste is directly reused to produce fiber, preform waste is directly reused to produce preforms, and film waste is directly reused to produce film. The prices of baled bottles increased for instance between the years 2000 and 2008 from about 50 Euro/ton to over 500 Euro/ton in 2008. I've been around dogs all my life and I don't ever recall reacting like this before. Virtually all single-serving and 2-liter bottles of carbonated soft drinks and water sold in the U.S. are made from PET. These processes allow the conversion of undried PET flakes without substantial viscosity decrease caused by hydrolysis. The end group proportion shifts toward the direction of the COOH end groups built up through a thermal and oxidative degradation. Terylene (a trademark formed by inversion of (polyeth)ylene ter(ephthalate)) is also spliced into bell rope tops to help prevent wear on the ropes as they pass through the ceiling. Recycling processes with polyester are almost as varied as the manufacturing processes based on primary pellets or melt. This is because drying the material in less than 4 hours would require a temperature above 160 °C, at which level hydrolysis would begin inside the pellets before they could be dried out. In the second section, the collected bottles are converted to clean PET bottle flakes. Exposing PET to boiling or microwaving can increase the levels of antimony significantly, possibly above US EPA maximum contamination levels. [39] The partially glycolyzed and finely filtered recycled material is continuously fed to the esterification or prepolycondensation reactor, the dosing quantities of the raw materials are being adjusted accordingly. 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The processing equipment when using directly secondary materials such as toluene. [ 17 ] polymer forms more.
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