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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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


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 ?
DENSO, as a global automotive supplier, is excited to collaborate with Uber ATG and Toyota to develop advanced automated driving hardware that we believe will transform future mobility."
Today, exporting accounts for over half of ATG's turnover.
"With Swansea Council's significant investment into the arena and regeneration of the wider Swansea Arena, ATG is delighted to be part of this project."
Based on time-survival curves (Figure 1(a)), the one-year and five-year survival rates of patients in the three induction cohorts were 97.6% and 91.3% for ATG, 97.1% and 91.2% for alemtuzumab, and 97.8% and 90% for basiliximab, respectively (log-rank p = .14).
"After a few years there, I knew I had found my passion, and I was recruited to help a relatively new software company in what seemed to be an explosive growth area," Hollowell said of his move to ATG. "The opportunity to provide strong fiscal guidance to a company and afford it stability gives me a sense of satisfaction that makes every day at work a challenge I rush to accept."
ATG Danmon has promoted Russell Peirson-Hagger from his current role as Commercial Director to take the position of Managing Director.
(NASDAQ: GOGO) said it has announced the ATG 1000, a new connectivity system for light jets, turboprops and owner-flown aircraft.
ATG-4 will be available for business aircraft via a new equipment package called ATG 8000.
As the performing focus for their work, the eight accomplished artists in the program will he creating #UncleJohn, billed as "an open air opera inspired by Mozart's Don Giovanni.- ATG Artistic Director Joel Ivany has written a new English libretto for the piece and he will stage it at the nearby Cave and Basin National Historic Site, unknown as an opera venue but renowned as the locus of the earliest development, in 1885, of Canada's national park system.
WORLDWIDE COMPUTER PRODUCTS NEWS-June 6, 2014-Gogo to install its ATG connectivity service on additional American Airlines' aircraft
OGogo's ATG Canadian network will allow the company to offer seamless in-flight Internet service between the U.S.