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- Depression
- depression, a psychological disorder that can be marked by sleep
and eating disturbances, lack of concentration, problems at work, intense feelings of
emptiness, guilt, and worthlessness, and suicidal thoughts. A depressive illness is
distinguished from a temporary "blue" mood or grief after a disappointment or
loss and may have both psychological and biochemical components. The illness may have a
manic phase (see MANIC DEPRESSION). Many people improve significantly with psychological
treatment and ANTIDEPRESSANT medication, often used in combination. Electroconvulsive
therapy may help severe cases. 1
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- Dihydroxyphenylalanine
- di·hy·drox·y·phen·yl·al·a·nine
(dì´hì-dròk´sê-fèn´el-àl¹e-nên´, -fê´nel-) noun See Dopa. 1
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- DNA
- DNA (dê´èn-â¹) (noun) A nucleic acid that carries the genetic
information in the cell and is capable of self-replication and synthesis of RNA. DNA
consists of two long chains of nucleotides twisted into a double helix and joined by
hydrogen bonds between the complementary bases adenine and thymine or cytosine and
guanine. The sequence of nucleotides determines individual hereditary characteristics.
[D(EOXYRIBO)N(UCLEIC) A(CID).] 2
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- Dopamine
- do·pa·mine (do¹pe-mên´) noun A monoamine neurotransmitter
formed in the brain by the decarboxylation of dopa and essential to the normal functioning
of the central nervous system. A reduction in its concentration within the brain is
associated with Parkinson’s disease. [DOP(A) + AMINE.] 2
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- do·pa
- do·pa (do¹pe) noun An amino acid, C9H11NO4, formed in the liver
from tyrosine and converted to dopamine in the brain. [d(ihydr)o(xy)p(henyl)a(lanine).] 2
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- Double Blind Study
- double blind (noun) A testing procedure, designed to eliminate
biased results, in which the identity of those receiving a test treatment is concealed
from both administrators and subjects until after the study is completed.
— dou¹ble-blind´ (dùb¹el-blìnd¹) adjective 2
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