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any of a large family of proteinsprotein,
any of the group of highly complex organic compounds found in all living cells and comprising the most abundant class of all biological molecules. Protein comprises approximately 50% of cellular dry weight.
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 of a spherical or globular shape that are widely distributed throughout the plant and animal kingdoms. Many of them have been prepared in pure crystalline form. The term globulin is a partly procedural one, used in classifying an otherwise diverse group of proteins that are soluble in water or dilute salt solutions. Among the most important are the immunoglobulins (Ig), the antibodies of the immune system (see immunityimmunity,
ability of an organism to resist disease by identifying and destroying foreign substances or organisms. Although all animals have some immune capabilities, little is known about nonmammalian immunity.
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). They are classified into five types based upon structure: IgA, IgD, IgE, IgG, and IgM. IgG or &ggr;-globulin is the most common and forms about 70% of the immunoglobins in the blood. Other globulins are involved in the transport of a variety of substances, including lipidslipids,
a broad class of organic products found in living systems. Most are insoluble in water but soluble in nonpolar solvents. The definition excludes the mineral oils and other petroleum products obtained from fossil material.
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, hormoneshormone,
secretory substance carried from one gland or organ of the body via the bloodstream to more or less specific tissues, where it exerts some influence upon the metabolism of the target tissue.
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, and inorganic ions.
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A general name for any member of a heterogeneous group of serum proteins precipitated by 50% saturated ammonium sulfate. See Protein, Serum

The introduction of electrophoresis during the 1930s permitted subdivision of the globulins into alpha, beta, and gamma globulins on the basis of relative mobility at alkaline pH (8.6). However, each of these subgroups, though electrophoretically homogeneous, consists of a great variety of proteins with different biological properties and markedly different sizes and chemical properties other than net charge. Thus the α2-globulins, for example, as defined by moving boundary or paper electrophoresis, contain proteins ranging in molecular weight from approximately 50,000 to approximately 1,000,000 (α2-macroglobulin), each with differing functions. See Immunoglobulin

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.


A heat-labile serum protein precipitated by 50% saturated ammonium sulfate and soluble in dilute salt solutions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


any of a group of simple proteins, including gamma globulin, that are generally insoluble in water but soluble in salt solutions and coagulated by heat
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Kumar, "Living related liver transplantation for hepatitis B-related liver disease without hepatitis B immune globulin prophylaxis," Liver Transplantation, vol.
Fortunately, immunization programs that utilize a combination of hepatitis B vaccine and hepatitis B immune globulin have been shown to reduce the chronic carrier rate in these at-risk infants and, in turn, decrease the likelihood of the development of acute and chronic complications.
Use of hepatitis B vaccine and hepatitis B immune globulin can prevent perinatal transmission in about 95% of cases.
If the health care worker is given hepatitis B immune globulin, the risk decreases to 24%.
But if the mother is positive for surface antigen, LBW infants under 2,000 g birth weight should receive an initial dose of the hepatitis B vaccine as well as hepatitis B immune globulin within 12 hours of birth.
Newborns of women who test positive are administered hepatitis B immune globulin.
In addition to receiving the hepatitis B vaccine series, infants born to HBsAgpositive mothers also should receive 0.5 mL of hepatitis B immune globulin within 12 hours of birth at separate injection sites.
If the child has not been immunized, administer both HBV vaccine and hepatitis B immune globulin (HBIG).
Staff from the perinatal hepatitis B program verify that appropriate prophylaxis is provided to at-risk infants at birth (hepatitis B immune globulin [HBIG] and first dose of hepatitis B vaccine) by direct communication with the medical staff at the obstetrics hospitals or by review of a faxed copy of the infant's medical record.

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