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Hydrogels
A gel is a solid jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state.[1] By weight, gels are mostly liquid, yet they behave like solids due to a three-dimensional cross-linked network within the liquid. It is the crosslinking within the fluid that gives a gel its structure (hardness) and contributes to the adhesive stick (tack). In this way gels are a dispersion of molecules of a liquid within a solid in which liquid particles are dispersed in the solid medium
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Gel (other)
A gel is a complex solid but fluid substance with liquid-like properties. Gel
Gel
may also refer to:Contents1 Personal care 2 Pharmaceutics and physical chemistry 3 Entertainment 4 Other uses 5 See alsoPersonal care[edit]Hair gel, a gel used for setting hair styles Shower gel, a cosmetic body wash Personal lubricant
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Soil
Soil
Soil
is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. The Earth's body of soil is the pedosphere, which has four important functions: it is a medium for plant growth; it is a means of water storage, supply and purification; it is a modifier of Earth's atmosphere; it is a habitat for organisms; all of which, in turn, modify the soil. Soil
Soil
interfaces with the lithosphere, the hydrosphere, the atmosphere, and the biosphere.[1] The term pedolith, used commonly to refer to the soil, literally translates ground stone
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Silicone
Silicones, also known as polysiloxanes, are polymers that include any inert, synthetic compound made up of repeating units of siloxane, which is a chain of alternating silicon atoms and oxygen atoms, frequently combined with carbon or hydrogen or both. They are typically heat-resistant and rubber-like, and are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation. Some common forms include silicone oil, silicone grease, silicone rubber, silicone resin, and silicone caulk.[1] Silicones are of three types: 1. straight chain silicones; 2. cyclic silicones; 3
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Polyacrylamide
Polyacrylamide (IUPAC poly(2-propenamide) or poly(1-carbamoylethylene), abbreviated as PAM) is a polymer (-CH2CHCONH2-) formed from acrylamide subunits. It can be synthesized as a simple linear-chain structure or cross-linked, typically using N,N'-methylenebisacrylamide. In the cross-linked form, the possibility of the monomer being present is reduced even further. It is highly water-absorbent, forming a soft gel when hydrated, used in such applications as polyacrylamide gel electrophoresis, and can also be called ghost crystals when cross-linked, and in manufacturing soft contact lenses. In the straight-chain form, it is also used as a thickener and suspending agent
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Polymacon
Polymacon is a non-proprietary (i.e., generic) term for a hydrophilic polymer of 2-hydroxyethylmethacrylate (HEMA) cross-linked with ethylene glycol dimethacrylate (62%) and water (38%).[1] It is used in the manufacture of soft contact lenses, and is considered a low hydration hydrogel of nonionic polymer.[2] References[edit]^ Zia Chaudhuri; Murugesan Vanathi (2012), Postgraduate Ophthalmology, JP Medical Ltd, pp. 79–80, ISBN 978-93-5025-270-3  ^ Joseph C. Salamone (23 July 1996), Polymeric Materials Encyclopedia, CRC Press, p. 1507, ISBN 978-0-8493-2470-3 This article about polymer science is a stub
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Precordial Leads
Electrocardiography
Electrocardiography
(ECG or EKG[a]) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on the skin. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle's electrophysiologic pattern of depolarizing and repolarizing during each heartbeat. It is a very commonly performed cardiology test. In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds)
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Polyethylene Oxide
Polyethylene glycol
Polyethylene glycol
(PEG) is a polyether compound with many applications from industrial manufacturing to medicine. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight. The structure of PEG is commonly expressed as H−(O−CH2−CH2)n−OH.Contents1 Available forms and nomenclature 2 Production 3 Uses3.1 Medical uses 3.2 Chemical uses 3.3 Biological uses 3.4 Commercial uses 3.5 Industrial uses4 Health effects 5 See also 6 References 7 External linksAvailable forms and nomenclature[edit] PEG, PEO, and POE refer to an oligomer or polymer of ethylene oxide. The three names are chemically synonymous, but historically PEG is preferred in the biomedical field, whereas PEO is more prevalent in the field of polymer chemistry
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PolyAMPS
PolyAMPS, or poly(2-acrylamido-2-methyl-1-propanesulfonic acid)® (Trademark of The Lubrizol
Lubrizol
Corporation), is an organic polymer. It is water-soluble, forms gels when cross linked, and acts as a strong anionic polyelectrolyte. It can be used for ion exchange resins. It can form hydrogels. See also[edit] 2-Acrylamido-2-methylpropane sulfonic acid
2-Acrylamido-2-methylpropane sulfonic acid
(AMPS)This article about polymer science is a stub
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Polyvinylpyrrolidone
PVPP, Crospovidone, Polyvidone PNVP Poly[1-(2-oxo-1-pyrrolidinyl)ethylen] 1-Ethenyl-2-pyrrolidon homopolymer 1-Vinyl-2-pyrrolidinon-PolymereIdentifiersCAS Number9003-39-8 Y3D model (JSmol)Interactive imageAbbreviations PVP, PVPP, NVP, PNVPChEMBLChEMBL1909074 NChemSpidernoneECHA InfoCard 100.111.937E number E1201 (additional chemicals)SMILESN1(C(CCC1)=O)[C@@H](C*)*Properties Chemical
Chemical
formula(C6H9NO)nMolar mass 2,500 – 2,500,000 g·mol−1Appearance white
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Water Gel Explosives
A water-gel explosive is a fuel sensitized explosive mixture consisting of an aqueous ammonium nitrate solution that acts as the oxidizer.[1] Water gels that are cap-insensitive are referred to under United States safety regulations as blasting agents. Water gel explosives have a jelly-like consistency and come in sausage-like packing stapled shut on both sides.[2] Water-gel explosives have almost completely displaced dynamite,[3] becoming the most-used civil blasting agents.Contents1 Composition 2 Preparation 3 Advantages and uses 4 ReferencesComposition[edit] Water gels usually have many different ingredients. They contain a gelatinizing agent, also known as a thickener, that modifies their consistency, ranging from easily pourable gels to hard solids. Polyvinyl alcohol, guar gum, dextran gums, and urea-formaldehyde resins are the typical gelling agents
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Breast Implant
A breast implant is a prosthesis used to change the size, shape, and contour of a woman’s breast. In reconstructive plastic surgery, breast implants can be placed to restore a natural looking breast mound for post–mastectomy breast reconstruction patients or to correct congenital defects and deformities of the chest wall. They are also used cosmetically to enhance or enlarge the appearance of the breast through breast augmentation surgery.Play media(video) A doctor marking the chest for implants.There are three general types of breast implant devices, defined by their filler material: saline solution, silicone gel, and composite filler. The saline implant has an elastomer silicone shell filled with sterile saline solution during surgery; the silicone implant has an elastomer silicone shell pre-filled with viscous silicone gel; and the alternative composition implants featured miscellaneous fillers, such as soy oil, polypropylene string, etc
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Burn (injury)
A burn is a type of injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or radiation.[3] Most burns are due to heat from hot liquids, solids, or fire.[7] While rates are similar for males and females the underlying causes often differ.[4] Among women in some areas, risk is related to use of open cooking fires or unsafe cook stoves.[4] Among men, risk is related to the work environments.[4] Alcoholism
Alcoholism
and smoking are other risk factors.[4] Burns can also occur as a result of self harm or violence between people.[4] Bur
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Hair Gel
Hair
Hair
gel is a hairstyling product that is used to harden hair into a particular hairstyle.Contents1 History 2 Types2.1 Cationic polymers 2.2 Other polymers3 See also 4 References 5 Further readingHistory[edit] Analysis of ancient Egyptian mummies has shown that they styled their hair using a fat-based gel. The researchers behind the analysis say that the Egyptians used the product to ensure that their style stayed in place in both life and death. Natalie McCreesh, an archaeological scientist from the KNH Centre for Biomedical Egyptology at the University of Manchester, England, and her colleagues studied hair samples taken from 18 mummies
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Wound
A wound is a type of injury which happens relatively quickly in which skin is torn, cut, or punctured (an open wound), or where blunt force trauma causes a contusion (a closed wound)
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Wound Gel
A hydrocolloid dressing is an opaque or transparent[1] dressing for wounds. A hydrocolloid dressing is biodegradeable, non-breathable, and adheres to the skin, so no separate taping is needed. The active surface of the dressing is coated with a cross-linked adhesive mass containing a dispersion of gelatin, pectin and carboxy-methylcellulose together with other polymers and adhesives forming a flexible wafer. In contact with wound exudate, the polysaccharides and other polymers absorb water and swell, forming a gel. The gel may be designed to drain, or to remain within the structure of the adhesive matrix.[2] The moist conditions produced under the dressing are intended to promote fibrinolysis, angiogenesis and wound healing, without causing softening and breaking down of tissue. The gel which is formed as a result of the absorption of wound exudate is held in place within the structure of the adhesive matrix
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