| Hb | <cell biology, haematology> Four subunit globular oxygen carrying protein of the erythrocytes of vertebrates and some invertebrates. It is a conjugated protein containing four haem groups and globin. There are two alpha and two beta chains (very similar to myoglobin) in adult humans, the haem moiety (an iron containing substituted porphyrin) is firmly held in a nonpolar crevice in each peptide chain. There are four globin polypeptide chains, designated alpha, beta, gamma, delta in the adult. Each is composed of several hundred amino acids. (08 Mar 2000) |
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| Hb S | <abbreviation> Sickle cell haemoglobin. (05 Mar 2000) |
| hb101 | <microbiology> A substrain of the bacteria Escherichia coli which is unusually good (extremely efficient) at taking in introduced foreign DNA and incorporating it into its own genome. It is therefore commonly used as the host organism for growing recombinant DNA vectors. (09 Oct 1997) |
| HBcAb | <abbreviation> Antibody to the hepatitis B core antigen. (05 Mar 2000) |
| HBcAg | <abbreviation> Hepatitis B core antigen. (05 Mar 2000) |
| HbChesapeake | Abbreviation for haemoglobin Chesapeake. (05 Mar 2000) |
| HbCO | <abbreviation> Carboxyhemoglobin. (05 Mar 2000) |
| HBE | <abbreviation> His bundle electrogram. (05 Mar 2000) |
| HBeAb | <abbreviation> Antibody to the hepatitis B e antigen. (05 Mar 2000) |
| HBeAg | <abbreviation> Hepatitis B e antigen. (05 Mar 2000) |
| HBIG | Hepatitis B immune globulin, which contains antibodies to hepatits b virus and offers prompt but short lived protection. (12 Dec 1998) |
| HbO2 | <abbreviation> Oxyhemoglobin. (05 Mar 2000) |
| HBsAb | <abbreviation> Antibody to the hepatitis B surface antigen. (05 Mar 2000) |
| HBsAg | <immunology, virology> A serologic marker on the surface of the hepatitis B virus. The body will normally produce antibodies to hepatitis B surface antigen as part of the normal immune response to infection. It is the presence of antibodies to the hepatitis B surface antigen that are detected in a positive hepatitis B blood test. (27 Sep 1997) |
| HBV | The type species of the genus orthohepadnavirus which causes human hepatitis b and is also apparently a causal agent in human hepatocellular carcinoma. The dane particle is an intact hepatitis virion, named after its discoverer. Non-infectious spherical and tubular particles are also seen in the serum. (12 Dec 1998) |