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1. pertaining to chemistry.
2. a substance composed of chemical elements, or obtained by chemical processes.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Relating to chemistry.
Farlex Partner Medical Dictionary © Farlex 2012

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  
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


Relating to chemistry.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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-

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References in periodicals archive ?
Categories: Environmental Protection, Toxic substances, Risk assessment, Reporting requirements, Product evaluation, Information disclosure, Health hazards, Hazardous substances, Environmental monitoring, Environmental law, Data collection, Comparative analysis, Chemical regulation, Chemical industry
Session 2 on "Reactive extrusion and PO modification/functionalization," will be chaired by Abdelhadi Sahnoune of ExxonMobil Chemical. Presentations will include the following: "Control of free radical chemistry during extrusion and compounding," Mohamed Esseghir, Dow Chemical; "Application of counter rotating non-intermeshing twin screw extruders to reactive extrusion processes," Chris Tucker, NFM; "Synthesis and characterization of long chain branched isotactic PP via metallocene catalyst and t-reagent," Michael Chung, Penn State University; "Improved functionalized polyolefins via reactive extrusion," Syed Abuzar, Chemtura; "Reactive processing of polypropylene--clay nano-composites," K.
Companies are required to seek special authorization for chemicals known to cause cancer or reproductive problems and chemicals that accumulate in the environment or in people.
It processes the mixture of chemicals that make up a smell as a pattern and then matches that pattern to one that you've already stored in your brain.
Ciba Specialty Chemicals Corp., Tooling Systems Group, MI along with International Chemical Information Services (ICIS), announced the launch of ICISsearch (
"For the process path, all specialty chemicals should be used only if the value to operations exceeds the cost of the chemical.
The Chemical Business Media division of Access Intelligence (Rockville, MD), a portfolio company of Veronis Suhler Stevenson (New York), has acquired Harriman Chemsult Ltd (London), a global chemical industry pricing service for the chlor-alkali sector.
Scientific studies conducted or funded by the chemical industry have long been acknowledged by government agencies, nongovernmental organizations, and the scientific community at large as necessary and valuable contributions to the understanding of potential public health and environmental effects related to the manufacture and use of chemicals [Environmental Defense 1998; Health and Environmental Sciences Institute 2005; U.S.
For workers and consumers alike, knowing what chemicals are toxic requires knowledge of chemical names and diligent reading of microscopic labels.
Of the 287 chemicals detected in the samples, 180 caused cancer, 217 were neurotoxins, and 208 caused birth defects in animal tests.
"I am pleased to join Governor Ridge today to announce a series of new initiatives by the Environmental Protection Agency to advance security at facilities that handle hazardous chemicals," Whitman's speech begins.

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