chemical

Also found in: Dictionary, Thesaurus, Acronyms, Idioms, Encyclopedia, Wikipedia.

Related to chemical: chemical pregnancy, chemical peel

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.

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.

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 ?

Lotte Chemical said its merger with Lotte Advanced Materials Co.

Lotte Chemical said to submit initial bid for Japan's Hitachi Chemical

Technical presentations will include: "Metallocene PP in cast film applications," Daniele Bugada, Basell USA; "High clarity and gloss PP blown film," Rodolfo Mier and Mark Miller, Total Petrochemicals USA; "Quantification and characterization of gels in PE film," Thomas Butler, Blown Film Technology LLC, and Chuck Mork, Dow Chemical; "Novel polyolefin films from fibrous webs," Gene Joseph, 3M; "New developments in ionomer technology for film applications," Barry Morris, DuPont; and "Polybutene-1: Exploiting its unique properties to enhance the performance of other polyolefins," Omar Boutini, Basell USA.

SPE plans meeting on polyurethanes

They hope that ENose will one day monitor the inside of a spacecraft to make sure that there aren't any chemical leaks, says Amy Ryan.

Picture the smell

Endex endothermic chemical foaming and nucleating agents, and endothermic/exothermic synergistic hybrids for thermoplastic foams generate fine closed-cell structures.

Blowing agents

According to Irenee Philippe, director of technology, Ciba Specialty Chemicals, Suffolk, Virginia, competitive advantage is achieved when performance chemical programs allow newer machines to optimize their operating windows with maximum return on investment (ROI) while enabling older paper machines to operate more competitively without major capital investment.

Mills pursue cost effective performance chemistry

EPA requirement that all studies required to be submitted in connection with chemical regulation and pesticide statutes be conducted in accordance with U.S.

Assessing the reliability and credibility of industry science and scientists

"They are always finding new twists on ingredients and adding them to products," says Horowitz about the cosmetics and chemical industry.

Under the varnish: Vietnamese nail salon workers face the highest exposure to dangerous chemicals--but who's responsible for their safety?

Of the 287 chemicals detected in the samples, 180 caused cancer, 217 were neurotoxins, and 208 caused birth defects in animal tests.

Not-so-special delivery: sometimes the toxic waste is not just in babies' diapers

The most interesting part of the course was the case study assignment, which was designed to focus upon a chemical industry accident.

Certification for government oversight of manufacturing

The Administration refuses to do what is necessary to protect the American public from terrorist attacks on chemical plants.

Open to attact: Bush gives in to chemical companies, leaving the nation vulnerable

Prevention is the key to escaping chemical sensitivities.

So sensitive! Take a chemical inventory of your home

The NAS study concluded that most of the proposed chemicals could be used safely and reserved judgment on others pending more study.