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Found Cation 317 times.

Displaying results 1 to 10.

1. 2-aminopurine
A derivative of purine which can substitute for adenine during DNA replication . As a result, it can induce mistakes in DNA and is therefore a powerful mutagen .

2. 3'-azido-3'-deoxythymidine (AZT)
An antibiotic used to treat infection by HIV (the AIDS virus ). The drug works by blocking replication of the HIV genetic material (in this case it is composed of RNA rather than DNA ) by preventing the viral RNA from inserting into the host DNA.

3. Acycloguanosine (acyclovir)
An antiviral medication used to treat herpesvirus infections; it works by inhibiting viral DNA synthesis.

4. Adaptation
The condition of showing fitness for a particular environment, as applied to characteristics of a structure, function or entire organism; a modification of a species that makes it more fit for reproduction and/or existence under the conditions of its environment.

5. Adoral
An adoral location indicates proximity to an organism's mouth. The adoral side of an organism is the side where the mouth is located.

6. Aerie
A protected location on a cliff used by predatory birds as a site for rearing their young.

7. Alcohol
Ethyl alcohol, also known as ethanol, the spirit in wine, is classified as a sedative-hypnotic drug. The criminal code of Canada states that it is an offence while the person's ability to operate or has control of a motor vehicle or vessel is impaired by alcohol or a drug or while the person's blood levels of alcohol exceed 80 mg/dL. Impaired driving performance has been observed with serum levels of ethanol as low as 30 mg/dL. A serum level above 300 mg/dL usually produces coma. Intoxication of alcohol is associated with violence, suicide, child and spouse abuse, respiratory depression, stupor, vomiting, predisposing to Mallory-Weiss Syndrome, hypoglycemia, cardiac arrhythmia, seizures. Chronic ingestion is associated with liver cirrhosis and withdrawal symptoms (Delirium Tremens).Two groups of alcohol drinkers are indentifiable based on the pattern of drinking: the problem drinkers and the ones with severe alcohol dependence. * Methyl alcohol, also known as methanol, or wood alcohol can also produce the sensation of being "drunk". However, ingestion of large quantities of methanol can cause visual disturbances (blindness via neurological damage), and a metabolic acidosis and is a medical emergency necessitating fluid resuscitation, respiratory care, ethanol infusion to block the building up of toxic products and dialysis. * Isopropyl alcohol is rubbing alcohol; it is poisonous.

8. Aldose reductase inhibitor
A class of drugs being studied as a way to prevent eye and nerve damage in people with diabetes . Aldose reductase is an enzyme that is normally present in the eye and in many other parts of the body. It helps change glucose (sugar) into a sugar alcohol called sorbitol. Too much sorbitol trapped in eye and nerve cells can damage these cells, leading to retinopathy and neuropathy . Drugs that prevent or slow (inhibit) the action of aldose reductase are being studied as a way to prevent or delay these complications of diabetes.

9. Alkylating agent
A substance which contains an alkyl (derived from an alkane ) radical , with which it can replace a hydrogen atom with itself in an organic compound. As a result, it can act on DNA and interfere with replication , making it useful for destroying cells such as cancer cells.

10. Amplification
An increase in the number of copies of a specific DNA fragment; can be in vivo or in vitro . See also: cloning , PCR .

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