The oroantral communication (OAC) is a pathological condition that consists of an open connection between the oral cavity and the maxillary sinus. It’s a complication which most frequently caused by the extraction maxillary posterior teeth. [1] Since the maxillary sinus occupies an a large part of the maxilla‚ the roots of these teeth are close to it. The controversy revolves around maxillary molars‚ first molar and second molar. The chances of occurrence of oroantral communication increases‚ if
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several solutes are absorbed from the gas phase into a solid phase. Distillation A volatile vapor phase and a liquid phase that vaporizes are involved. Liquid-liquid Extraction When the two phases are liquids‚ where a solute or solutes are removed from one liquid phase to another liquid phase Leaching (extraction) If a fluid is being used to extract a solute from a solid. Crystallization Solute components soluble in a solution can be removed from the solution by adjusting the conditions
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opposed by many‚ who cite possible risks to the environment including land and water resources along with the direct impacts to public health as grounds for prohibiting coal seam gas extraction. Much criticism has been presented in the media to condemn CSG extraction‚ with those that are opposed to the notion of gas extraction in and around residential areas along with other locations including vineyards‚ stables‚ farmland and in the vicinity of water catchments. The question remains‚ at a very broad level
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Crude drug A crude drug is any naturally occurring‚ unrefined substance derived from organic or inorganic sources such as plant‚ animal‚ bacteria‚ organs or whole organisms intended for use in the diagnosis‚ cure‚ mitigation‚ treatment‚ or prevention of disease in man or other animals. Crude drugs are unrefined medications in their raw or natural forms. Prior to the 1950s‚ every pharmacy student learned about crude drugs in pharmacognosy class. Pharmacognosy is the study of the proper horticulture
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of hypoglycemia‚ particularly GH deficiency‚ hypopituitarism‚ adrenocorticotropic hormone (ACTH) unresponsiveness‚ and glycogen synthase deficiency‚ all of which may have similar presentations. Here we report a child presented to us for dental extractions under general anaesthesia. An eight-year-old boy‚ weighing 35 kg‚ known case of IKH for past 5 years and asthma since childhood‚ was
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water-based fluid which is gradually increased by rate and pressure. Then‚ over time the coal seam is unable to keep up with the fracturing fluid which results in high pressure causing the coal to fracture along the weaknesses within. Sand is pumped into these fractures to keep them ‘propped’ open after the pressures are released. The first diagram in the appendix shows what occurs in the subsurface during a typical hydraulic fracturing event. After a period of fluid recovery or groundwater extraction is
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this experiment‚ the separation methods were decantation‚ filtration and evaporation and extraction and each is explained below: Decantation‚ this is the separation of liquid from a solid by careful pouring the supernatant liquid from the holding vessel without disturbing the solid at the bottom of the container. Filtration‚ Filtration is a mechanical or physical process to separate solid particulates from fluids. The solid remaining behind on the filter paper is known as the residue and the liquid
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Environmentally more friendly | Which enzyme(s)? | OxidoreductasesHydrolasesLyasesIsomerases | Which reaction system? | AqueousAqueous and water-miscible organic solventAqueous and water-immiscible organic solventPure organic solventOther solvents (supercritical fluids‚ ionic liquids) | Which ‘chemistry’ | (dynamic) kinetic resolution vs. asymmetric sunthesis?Cofactor free or cofactor-dependent enzymes | Organic chemistry is the science concerned with all aspects of organic compounds. It is a sub discipline
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A principle concern in the fracking debate lies over the content of the “fracking fluid.” This fluid is used to increase pressure in shale formations and cause fractures that increase permeability and allow greater access and capture of liquid natural gas or other hydrocarbon products that would be otherwise inaccessible or require numerous more wells be drilled (He‚ Li‚ Liu‚ Barbot‚ Vidic‚ 2014). This fluid consists of water and chemical additives such as‚ “ friction reducers to optimize flow characteristics
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Another concern with the potential contamination of drinking water wells from surface activities. Leaky surface impoundments‚ accidental spills‚ or careless surface disposal of drilling fluids at the natural gas production site could increase the risk of contaminating the nearby water well. Still more concerns involve the management of storage‚ treatment‚ and disposal of water produced in the fracturing process. Broader environmental
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