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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.

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 ?
He said: 'Some henna products manufactured in Dadu, Naushahro Feroze and Mehar are best for applying on skin due to its quality; however, chemically manufactured henna products are harmful for girl and women skin.'
* 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.
Lightweight laminated glass using chemically strengthened glass reduces weight by 30% compared to conventional products.
On behalf of CRN, the Steptoe & Johnson comments call on the agency to "take into account not only whether the chemical structure of the dietary ingredient has been changed, but also whether any change in structure is sufficiently significant to potentially cause dietary supplements containing the dietary ingredient to be unsafe for consumers." In other words, FDA should examine not just the manufacturing process to determine what is chemically altered, but compare the starting and ending substances with an eye to whether those changes affected the safety of the end product.
The company said that when the storage cells become worn out, it plans to chemically treat them for hybrid vehicle use again.
Compared to artemisinin, the new drug is chemically more stable in the body, owing to its organic composition.
Now, when they worry about a chemical-related issue that's in the public eye, people can turn to "Chemically Speaking".
Explorers are chemically matched to other Explorers, but not to Builders, according to Dr Fisher.
It is located in a new, custom built facility in Newton, and is solely focused on the production of 100 percent chemically hardened flexible dies.
Before painting metal that is filled with rust, you might ask "Is removal a must?" While we always recommend removing rust, there are times when you just can't get at it, to sand, scrape or chemically dissolve it away.
According to UFP, T-Tubes are thinner, molded to fit industry standard tubes and fittings, easier to install and chemically resistant up to pH12.

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