| CTX | cefotaxime; cerebrotendinous xanthomatosis; chemotaxis; clinical trials exemption scheme; costotendi... |
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| CR | calculation rate; calculus removed; calorie-restricted; cardiac rehabilitation; cardiac resuscitatio... |
| CS | calf serum; campomelic syndrome; carcinoid syndrome; cardiogenic shock; caries-susceptible; carotid ... |
| HIV | Human Immunodeficiency Virus |
| CD4 | HIV helper cell count |
| HIV-1 reverse transcriptase | <enzyme> HIV-1 enzyme responsible for the synthesis of DNA from genomic RNA of the virus. It is encoded by the pol gene of HIV-1. Registry number: EC 2.7.7.- (12 Dec 1998) |
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| HIV-2 | An HIV species related to HIV-1 but carrying different antigenic components and with differing nucleic acid composition. It shares serologic reactivity and sequence homology with the simian lentivirus siv and infects only t4-lymphocytes expressing the CD4 phenotypic marker. (12 Dec 1998) |
| HIV-2 protease | <enzyme> Processes hiv-1pr53(gag) and analogous junction peptides in vitro; less than 60% amino acid identity to hiv-1 protease Registry number: EC 3.4.23.- Synonym: hiv2 protease (26 Jun 1999) |
| HIV-2 reverse transcriptase | <enzyme> Responsible for synthesis of double-stranded DNA from the genomic RNA of the virus; has rnase h and DNA-dependent DNA polymerase activities; was indexed as reverse transcriptase (87-91) Registry number: EC 2.7.7.- (26 Jun 1999) |
| HIV antibodies | Antibodies reactive with human immunodeficiency virus (HIV, previously called HTLV-III/lav) antigens of aids. This includes HIV-1 antibodies and HIV-2 antibodies. (12 Dec 1998) |
| HIV antigens | Antigens associated with specific proteins of the human adult T-cell immunodeficiency virus (HIV); also called HTLV-III-associated and lymphadenopathy-associated virus (lav) antigens. (12 Dec 1998) |
| HIV core protein p24 | A major core protein of the human immunodeficiency virus encoded by the HIV gag gene. HIV-seropositive individuals mount a significant immune response to p24 and thus detection of antibodies to p24 is one basis for determining HIV infection by elisa and western blot assays. The protein is also being investigated as a potential HIV immunogen in vaccines. (12 Dec 1998) |
| HIV encephalopathy | <immunology> A frequent cerebral condition in people with AIDS that results in the loss of cognitive capacity, affecting the ability to function in a social or occupational setting. Its cause has not been determined exactly, but may result from HIV infection of cells in the brain or an inflammatory reaction to such infection. (09 Oct 1997) |
| HIV enhancer | Cis-acting regulatory sequences in the HIV long terminal repeat (ltr) which play a major role in induction or augmentation of HIV gene expression in response to environmental stimuli such as mitogens, phorbol esters, or other viruses. The HIV enhancer is the binding site for many cellular transcription factors including the nuclear factor nf-kappa b. (12 Dec 1998) |
| HIV enteropathy | Chronic, well-established diarrhoea (greater than one month in duration) without an identified infectious cause after thorough evaluation, in an HIV-positive individual. It is thought to be due to direct or indirect effects of HIV on the enteric mucosa. HIV enteropathy is a diagnosis of exclusion and can be made only after other forms of diarrhoeal illness have been ruled out. (12 Dec 1998) |
| HIV envelope protein gp120 | External envelope protein of the human immunodeficiency virus which is encoded by the HIV env gene. It has a molecular weight of 120,000 kD and contains numerous glycosylation sites. Gp120 binds to cells expressing CD4 cell-surface antigens, most notably t4-lymphocytes and monocytes/macrophages. Gp120 has been shown to interfere with the normal function of CD4 and is at least partly responsible for the cytopathic effect of HIV. (12 Dec 1998) |
| HIV envelope protein gp160 | An envelope protein of the human immunodeficiency virus that is encoded by the HIV env gene. It has a molecular weight of 160,000 kD and contains numerous glycosylation sites. It serves as a precursor for both the HIV envelope protein gp120 and the HIV envelope protein gp41. (12 Dec 1998) |
| HIV envelope protein gp41 | Transmembrane envelope protein of the human immunodeficiency virus which is encoded by the HIV env gene. It has a molecular weight of 41,000 and is glycosylated. The n-terminal part of gp41 is thought to be involved in cell fusion with the CD4 antigens of t4 lymphocytes, leading to syncytial formation. Gp41 is one of the most common HIV antigens detected by immunoblotting. (12 Dec 1998) |
| HIV infections | Includes the spectrum of human immunodeficiency virus infections that range from asymptomatic seropositivity, thru aids-related complex (arc), to acquired immunodeficiency syndrome (aids). (12 Dec 1998) |
| HIV integrase | <enzyme> Enzyme of the human immunodeficiency virus that is required to integrate viral DNA into cellular DNA in the nucleus of a host cell. HIV integrase is a DNA nucleotidyltransferase encoded by the pol gene. Registry number: EC 2.7.7.- (12 Dec 1998) |