Loading...
  • allergy
  • In addition to theories about physiological causes and misdiagnosis, some experts believe that the so-called twentieth century syndrome may be a type of allergy rather than a chemical intolerance. (wisegeek.com)
  • toxins
  • If the levels of toxins are too high or if an individual is "weakened" by all the emotional stresses in their life, they become "sensitized" to the chemicals in the environment around them. (healpastlives.com)
  • sensitive
  • Debra Lynn Dadd was one of the first to be diagnosed with Multiple Chemical Sensitivities (MCS), an immune system disorder that results in becoming sensitive to all types of products that are made from petrochemicals. (alaskanewsdesk.com)
  • brain
  • Perhaps of more significance is the position of the Society of Nuclear Medicine Brain Imaging Council 6 that SPECT scans cannot detect brain abnormalities produced by chemicals. (aafp.org)
  • usually
  • In each of these, a chemical (smell usually, or taste) appears to precipitate one or more organ-system responses. (emedtv.com)
  • list of chemicals
  • The list of chemicals targeted by EDSP includes about 1,000 active ingredients in pesticides, 5,000 inert ingredients in pesticides, and 6,000 drinking water contaminants, with some overlap between the lists of pesticides and drinking water contaminants. (acs.org)
  • Specifically, the chemical control system was developed to include a list of chemicals appended to the 1988 UN Convention with the monitoring and reporting requirements under the auspices of the International Narcotics Control Board (INCB). (state.gov)
  • castration
  • Chemical castration is castration via anaphrodisiac drugs , whether to reduce libido and sexual activity, to treat cancer , or otherwise. (wikipedia.org)
  • Unlike surgical castration , where the gonads are removed through an incision in the body, chemical castration does not remove organs, nor is it a form of sterilization . (wikipedia.org)
  • Chemical castration is generally considered reversible when treatment is discontinued, although permanent effects in body chemistry can sometimes be seen, as in the case of bone density loss increasing with length of use of DMPA . (wikipedia.org)
  • In May 2016, The New York Times reported that a number of countries use chemical castration on rapists and pedophiles , often in return for reduced sentences. (wikipedia.org)
  • The first use of chemical castration occurred in 1944, when diethylstilbestrol was used with the purpose of lowering men's testosterone. (wikipedia.org)
  • Chemical castration is often seen as an easier alternative to life imprisonment or the death penalty because it allows the release of sex offenders while reducing or eliminating the chance that they reoffend. (wikipedia.org)
  • Some criminologists argue that the appearance of a lower recidivism rate in male sex offenders who take chemical castration treatment than in those who do not can be explained by factors other than biological effects of the medication. (wikipedia.org)
  • One hypothesis is that men who accept the negative effects of hormonal treatment in exchange for shorter prison sentence are distinct in that they value freedom from incarceration higher than men who rather stay in prison for a longer time than face the side effects of chemical castration. (wikipedia.org)
  • These criminologists explain apparently lower recidivism as an artifact of men who accept chemical castration being more engaged in hiding the evidence for reoffending, and that paroling such offenders constitute a risk of releasing criminals who commit as many new crimes as others but are better at hiding it. (wikipedia.org)
  • bonds
  • It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. (wikipedia.org)
  • Sometimes a chemical formula is complicated by being written as a condensed formula (or condensed molecular formula, occasionally called a "semi-structural formula"), which conveys additional information about the particular ways in which the atoms are chemically bonded together, either in covalent bonds , ionic bonds , or various combinations of these types. (wikipedia.org)
  • However, even a condensed chemical formula is necessarily limited in its ability to show complex bonding relationships between atoms, especially atoms that have bonds to four or more different substituents . (wikipedia.org)
  • The atoms in molecules, crystals, metals and diatomic gases-indeed most of the physical environment around us-are held together by chemical bonds, which dictate the structure and the bulk properties of matter. (wikipedia.org)
  • The idea is conceptually similar to photosynthesis in plants, which converts solar energy into the chemical bonds of glucose molecules, but without using living organisms, which is why it is also called artificial photosynthesis. (wikipedia.org)
  • While photodimerization stores the energy from sunlight in new chemical bonds, Photoisomerization stores solar energy by reorienting existing chemical bonds into a higher energy configuration. (wikipedia.org)
  • commonly
  • A chemical plant commonly has usually large vessels or sections called units or lines that are interconnected by piping or other material-moving equipment which can carry streams of material. (wikipedia.org)
  • An overall chemical process is commonly made up of steps called unit operations which occur in the individual units. (wikipedia.org)
  • A raw material going into a chemical process or plant as input to be converted into a product is commonly called a feedstock , or simply feed . (wikipedia.org)
  • Batch operation is commonly used in smaller scale plants such as pharmaceutical or specialty chemicals production, for purposes of improved traceability as well as flexibility. (wikipedia.org)
  • In the field of chemical biology, a chemical probe is a small molecule that is used to study and manipulate a biological system such as a cell or an organism by reversibility binding to and altering the function of a biological target (most commonly a protein) within that system. (wikipedia.org)
  • molecule
  • In chemistry , polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole moment, with a negatively charged end and a positively charged end. (wikipedia.org)
  • A chemical formula is a way of information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs. (wikipedia.org)
  • molecules
  • Polymers almost always appear as mixtures of molecules of multiple molar masses, each of which could be considered a separate chemical substance. (wikipedia.org)
  • For reasons of structural complexity, there is no condensed chemical formula (or semi-structural formula) that specifies glucose (and there exist many different molecules, for example fructose and mannose , that have the same molecular formula C 6 H 12 O 6 as glucose). (wikipedia.org)
  • reactor
  • The design of a chemical reactor deals with multiple aspects of chemical engineering . (wikipedia.org)
  • Other kinds of plants, such as polymer, pharmaceutical, food, and some beverage production facilities, power plants , oil refineries or other refineries , natural gas processing and biochemical plants, water and wastewater treatment, and pollution control equipment use many technologies that have similarities to chemical plant technology such as fluid systems and chemical reactor systems. (wikipedia.org)
  • chemistry
  • A chemical substance may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook. (wikipedia.org)
  • Chemical oceanography is the study of ocean chemistry: the behavior of the chemical elements within the Earth's oceans. (wikipedia.org)
  • Chemical Galaxy is intended primarily to excite an interest in chemistry among non-chemists, especially young people, but it is fully accurate scientifically in the information that it conveys about relationships between the elements, and it has the advantage over a table that it does not break up the continuous sequence of elements. (wikipedia.org)
  • impacts
  • EPA decided to go beyond the mandate and evaluate the impacts of chemicals on androgen and thyroid hormone systems and to look at effects in wildlife as well as humans. (acs.org)
  • solvent
  • The stability of a chemical compound is eventually limited when exposed to extreme environmental conditions such as heat, radiation, humidity, or the acidity of a solvent. (wikipedia.org)
  • sunlight
  • Store pool chemicals below 95°F/35°C and in conditions recommended by the manufacturer (for example, low humidity and out of direct sunlight). (cdc.gov)
  • sodium
  • Common sources of chemical burns include sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl) , sodium hydroxide ( Na OH ), lime (CaO), silver nitrate ( Ag NO 3 ), and hydrogen peroxide (H 2 O 2 ). (wikipedia.org)
  • Common sources of chemical burns include sulfuric acid (H2SO4), hydrochloric acid (HCl), sodium hydroxide (NaOH), lime (CaO), silver nitrate (AgNO3), and hydrogen peroxide (H2O2). (wikipedia.org)
  • However, the recommended flush time is as follows: 5 minutes - non- to mild irritants 15 - 20 minutes - moderate to severe irritants and chemicals that cause acute toxicity 30 minutes - most corrosives 60 minutes - strong alkalis such as sodium, potassium or calcium hydroxide Transporting the affected person to a health care facility may be important, depending on condition. (wikipedia.org)
  • reversible
  • In the 70's and 80's a fuel had been made from another reversible chemical, the norbornadiene to quadricyclane transformation cycle, but this failed because the reversal process had a low potential. (wikipedia.org)
  • molecular
  • Examples of chemical formulas for n -butane are the empirical formula C 2 H 5 , the molecular formula C 4 H 10 and the condensed (or semi-structural ) formula CH 3 CH 2 CH 2 CH 3 . (wikipedia.org)
  • An example is the condensed molecular/chemical formula for ethanol, which is CH 3 -CH 2 -OH or CH 3 CH 2 OH. (wikipedia.org)
  • Continuous
  • Chemical processes may be run in continuous or batch operation. (wikipedia.org)
  • Continuous plants are usually used to manufacture commodity or petrochemicals while batch plants are more common in speciality and fine chemical production as well as pharmaceutical active ingredient (API) manufacture. (wikipedia.org)
  • temperature
  • Liquids such as acids, solvents especially if they do not have a label Vapors and fumes Flammable materials Chemicals can change the physical state depending on temperature or pressure. (wikipedia.org)
  • burns
  • Additionally, chemical burns can be caused by some types of chemical weapons , e.g., vesicants such as mustard gas and Lewisite , or urticants such as phosgene oxime . (wikipedia.org)
  • Chemical burns may occur through direct contact on body surfaces, including skin and eyes, via inhalation, and/or by ingestion. (wikipedia.org)
  • Chemical fabrication , mining , medicine , and related professional fields are examples of occupations where chemical burns may occur. (wikipedia.org)
  • Chemical burns to the arm, caused by a blister agent e.g. mustard gas . (wikipedia.org)
  • Chemical burns may: need no source of heat, occur immediately on contact, not be immediately evident or noticeable, be extremely painful, diffuse into tissue and damage structures under skin without immediately apparent damage to skin surface. (wikipedia.org)
  • However
  • However, pool chemicals can also lead to injury when mixed together or when appropriate personal protective equipment is not used during handling. (cdc.gov)
  • However, in 2012 such seizures appeared to drop off and authorities now believe that traffickers in the Americas are turning to non-scheduled precursor chemicals to manufacture methamphetamine through alternative methods. (state.gov)
  • However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical. (wikipedia.org)
  • however, their identity can be established either by direct chemical analysis or reference to a single manufacturing process. (wikipedia.org)
  • However, final products from one plant may be intermediate chemicals used as feedstock in another plant for further processing. (wikipedia.org)
  • However chemical decomposition is being used in a growing number of ways. (wikipedia.org)
  • Batch
  • A batch of feedstock(s) is fed (or charged ) into a process or unit, then the chemical process takes place, then the product(s) and any other outputs are removed. (wikipedia.org)
  • laboratory
  • In the laboratory, chemical wastes are usually segregated on-site into appropriate waste carboys, and disposed by a specialist contractor in order to meet safety, health, and legislative requirements. (wikipedia.org)
  • Environmental Protec
  • Growing concerns about environmental contaminants associated with adverse developmental, reproductive, neurological, and immune effects led Congress more than 20 years ago to direct the U.S. Environmental Protection Agency to develop a program to screen chemicals for their potential to mimic estrogen in humans. (acs.org)
  • In the U.S., the Environmental Protection Agency (EPA) and the Occupational Safety and Health Administration (OSHA), as well as state and local regulations also regulate chemical use and disposal. (wikipedia.org)
  • Materials
  • It describes the concept of chemical peeling, materials used, indications, side effects, contraindications, how to perform it step by step at the clinic as well as post peeling precautions. (slideshare.net)
  • Chemical waste is a broad term and encompasses many types of materials. (wikipedia.org)
  • In contrast to this, chemical materials on the "Red List" should never be washed down a drain. (wikipedia.org)
  • Separate
  • Separate the air handling systems for the chemical storage area and pump room from the rest of the building. (cdc.gov)
  • If an older aquatic facility does not have separate air handling systems for the chemical storage area and pump room as well as the pool area, consider installing emergency heating, ventilating, and air conditioning (HVAC) cutoffs in these areas. (cdc.gov)
  • containers
  • Provide adequate lighting for reading labels on containers throughout the chemical storage area and pump room. (cdc.gov)
  • Do not store containers of any pool chemical directly on the floor. (cdc.gov)
  • For packaging, chemical liquid waste containers should only be filled up to 75% capacity to allow for vapour expansion and to reduce potential spills which could occur from moving overfilled containers. (wikipedia.org)
  • describes
  • Much of chemical oceanography describes the cycling of these elements both within the ocean and with the other spheres of the Earth system (see biogeochemical cycle). (wikipedia.org)
  • example
  • Chemicals are added to pool * water to kill disease-causing germs, maximize the efficacy of the disinfection process (for example, pH control), improve water quality, stop corrosion and scaling of equipment, and protect against algal growth. (cdc.gov)
  • Ensure availability of and easy access to up-to-date MSDSs near (for example, in the hallway just outside of) the chemical storage area, pump room, pool area, and any other location pool chemicals are stored or used. (cdc.gov)
  • For example, gas state chemicals will be inhaled or liquid state chemicals can be absorbed by the skin. (wikipedia.org)
  • bulk
  • Greater use of the INCB's PENS has led to tracing and monitoring of licit bulk shipments of these chemicals and thereby preventing diversion. (state.gov)
  • processes
  • A chemical plant is an industrial process plant that manufactures (or otherwise processes) chemicals , usually on a large scale. (wikipedia.org)
  • Chemical plants use chemical processes , which are detailed industrial-scale methods, to transform feedstock chemicals into products. (wikipedia.org)
  • Another important area of study in chemical oceanography is the behaviour of isotopes (see isotope geochemistry) and how they can be used as tracers of past and present oceanographic and climatic processes. (wikipedia.org)
  • common
  • In 2012, the United States worked with international partners to prevent diversion of ephedrine and pseudoephedrine-the two most common chemicals used to produce methamphetamine-into illicit channels. (state.gov)
  • products
  • Also, a chemical plant at a site may be constructed to utilize more than one chemical process, for instance to produce multiple products. (wikipedia.org)
  • Westlake Chemical is an international manufacturer and supplier of petrochemicals, polymers and fabricated building products. (wikipedia.org)
  • The company also trades in more than 100 chemical products and has the offices in Tokyo, Osaka, and Tokushima. (wikipedia.org)
  • symbols
  • Linear equivalent chemical names exist that can and do specify any complex structural formula (see chemical nomenclature ), but such names must use many terms (words), rather than the simple element symbols, numbers, and simple typographical symbols that define a chemical formula. (wikipedia.org)
  • The symbols help identify whether the chemicals that are going to be in use may potentially cause physical harm, or harm to the environment. (wikipedia.org)
  • made
  • Therefore, although the exact chemical identity is unknown, identification can be made to a sufficient accuracy. (wikipedia.org)
  • The policy of the Brezhnev era, which advocated lavish use of factory-made chemicals in agriculture, has not yet been fully reversed in spite of campaigns by new Green groups. (newscientist.com)
  • Chemical waste is a waste that is made from harmful chemicals (mostly produced by large factories). (wikipedia.org)
  • multiple
  • Chemicals can affect multiple targets crossing many tissues in the "thyroid axis," which includes the hypothalamus, pituitary gland, and thyroid gland. (acs.org)
  • term
  • Exposure to chemicals in the workplace can cause acute or long-term detrimental health effects. (wikipedia.org)
  • Long-term exposure to chemicals such as silica dust, engine exhausts, tobacco smoke, and lead (among others) have been shown to increase risk of heart disease, stroke, and high blood pressure. (wikipedia.org)