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chemical

 [kem´ĭ-k'l]
1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes.

chem·i·cal

(kem'i-kăl),
Relating to chemistry.

chemical

/chem·i·cal/ (kem´ĭ-k'l)
1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes.

chemical

[kem′əkəl]
Etymology: Gk, chemeia, alchemy
1 n, a substance composed of chemical elements or a substance produced by or used in chemical processes.
2 adj, pertaining to chemistry.

Pearl Index

Obstetrics A formula that allows comparison of the efficacy of contraceptive methods, calculated as the pregnancy rate in population divided by 100 yrs of exposure. See Breast feeding, Coitus interruptus, Condoms, Morning-after pill, Contraception, Natural family planning, Norplant, Rhythm method, RU 486.
Pearl index–pregnancies/100 years of use
Physiologic 15-30/100 years: Coitus interruptus, natural family planning (rhythm or safe period), eg calendar method, evaluation of cervical mucosa or temperature, breast feeding
Chemical 15-20/100 years: Contraceptive sponges
Barrier 2-20/100 years: Intrauterine devices, condoms
Hormonal 1-3/100 years
Surgical << 1/100 years: Ligation of fallopian tubes, vas deferens  

chem·i·cal

(kem'i-kăl)
Relating to chemistry.

chemical

1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes. See also toxin.

chemical adjuvant
a chemical added to another to improve its activity. For example, mineral gels added to vaccines. May also be a chemical added to feed to improve digestion, e.g. monensin in ruminants. These are more commonly referred to as additives. See also adjuvant.
agricultural chemical
chemical used in agriculture. Includes pesticides, anthelmintics, fertilizers, algaecides, herbicides, soil fumigants and the like.
chemical environment
that part of the animals' environment that is composed of chemicals. For farm livestock this includes fertilizers, defoliants, worm drenches, insect sprays, adjuvants to feed. For companion animals see household chemical (below).
household chemical
the roster of chemicals that one can expect to find in the average household. Includes insect sprays and repellents, snail bait, rodenticide, garden sprays, human medicines and the like.
chemical pneumonitis
results from aspiration of gastric acids.
chemical senses
see olfaction (2), taste.
chemical shearing
causing the fleece of sheep to be shed by the administration of a chemical substance to the sheep. Cyclophosphamide and mimosine have been used experimentally but there is no commercially available system.
chemical spoilage
occurs in preserved foods, especially canned ones. Is usually the result of interaction between the contents and an imperfect container. There may be gas produced, e.g. hydrogen swells, or discoloration of the tin.
chemical warfare
agents used include: (1) systemic poisons, e.g. hydrocyanic acid; (2) lung irritants, e.g. chlorine, phosgene; (3) lacrimators (weeping stimulators), e.g. CN, CAP, CS; (4) sternutators (sneeze stimulators); (5) vesicants, e.g. mustards, nitrogen mustards, arsenic mustards and nettle gases; (6) nerve gases, e.g. organophosphorus compounds.

Patient discussion about chemical

Q. How do you know when depression is chemical or situational? I've been feeling frustrated lately and while I think I show some signs of depression I think it is more a feeling down because of recent changes in my life. Every time I have seen a professional they all want to start me on some drug and having really seen no improvement over the years I swore off them years ago. When is it depression or "My life sucks right now"?

A. Thank you Johanna for sharing this with us.

Q. ADHD medications work on these brain chemicals? Hope you all know about the different types of brain chemicals, so the ADHD medications work on these brain chemicals?

A. Yes Alexzander. The active ingredients in the common ADHD medications are amphetamines. The amphetamines artificially increase the amount of certain neurotransmitters in the brain, speeding up the brain (thus the term “speed” for amphetamines). This makes the frontal area more active, at least while the drug is acting.

Q. How do you tell the difference between chemical burns, and burns from fire? Please don't spare on gross words i would like to know everything there is to burns.

A. Here is a ton of info on both-
http://en.wikipedia.org/wiki/Chemical_burn
http://en.wikipedia.org/wiki/Burn_%28injury%29

More discussions about chemical
References in periodicals archive ?
Markets must exist for these chemically recycled plastics.
Research was published in Nature Biotechnology in 2015 demonstrating the use of chemically modified synthetic sgRNA for performing CRISPR genome editing in human stem cells.
As things stand today, however, there are no easy answers for the chemically intolerant.
But West of Eden's magic shouldn't be reserved for only the chemically sensitive.
Among 250 consecutive admissions to a short-term residential treatment program for chemically dependent adolescents (ages 13 to 18), 50(20%) were found to have made suicidal gestures (male = 13, female = 37; mean age = 16.
But genetically modified or chemically addicted food represents more than just an imagined threat to European identity.
But Walker cautioned parents not to panic, that only some children are susceptible to chemically induced illnesses and that the solution to the problem can be as simple as bringing fresh air into the room.
ETFE (ethylene tetrafluoroethylene) film is highly conformable and chemically inert.
Managing the Chemically Dependent Nurse has 10 chapters and an appendix.
Research has shown that certain tetracyclines can be chemically modified to remove their antibiotic effects while retaining the properties that may make them effective in treating diseases involving inflammation and/or destruction of the body's connective tissues.
January 26, 2017 -- Scientists here have discovered the gene essential for chemically reprogramming human amniotic stem cells into a more versatile state similar to embryonic stem cells.
Identification of the technically and economically best sealing solution is said to necessitate extensive knowledge of the characteristics of the various groups of materials used in the field of sealing technology, including silicones, elastomers, thermoplastic elastomers, thermoplastics, metallic seal materials, composite materials and chemically engineered materials.

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