How are T-cells characterized?
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T-cells are a part of the immune system.  They attack viruses and bacteria as a predator attacks prey.
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A lymphocyte is a type of white blood cell involved in the vertebrate immune system..\n\n  u will find more in the given source..
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Main Entry: AIDS\nPronunciation: 'Adz\nFunction: noun\nEtymology: acquired immunodeficiency syndrome\n: a disease of the human immune system that is characterized cytologically especially by reduction in the numbers of CD4-bearing helper T cells to 20 percent or less of normal rendering the subject highly vulnerable to life-threatening conditions (as Pneumocystis carinii pneumonia) and to some that become life-threatening (as Kaposi's sarcoma) and that is caused by infection with HIV commonly transmitted in infected blood and bodily secretions (as semen) especially during illicit intravenous drug use and sexual intercourse
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By structure or by type. Do you mean Blood cell types? If so then they are classified by type. Such as: Erythrocytes, \nPlatelets, Leukocytes...  There are two types of cells, eukaryotic and prokaryotic. Eukaryotic cells are usally found in multi-cellular organisms, while prokaryotic cells are usually on their own. Or do you mean classifying specific cells such as cancer cell types? Or did you mean prison cell types? The question is to broad. The basic cell types are the two stated above. Hope that helps.
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CD4 is an immune marker.\nit is the binding site that the HIV virion attach to on the surface of the t-cell.  you could say CD4 is the DOOR LOCK and HIV its the KEY....  once the key fits into place.... well... your part of the club.
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Although gamma delta T cell receptor-bearing lymphocytes (gamma delta T cells) constitute a significant minority of circulating and tissue-associated T lymphocytes, the mechanism responsible for the activation of these cells is unknown. To address this question, resting gamma delta TCR+, CD3+, CD4-, CD8- cells isolated from the blood of healthy volunteers were cultured with allogeneic dendritic cells (DC) or monocytes, and their proliferative response measured. DC alone induced gamma delta T cells to proliferate, with a peak response on the sixth day of culture. Pretreatment of DC with an anti-HLA-DR mAb, but not anti-HLA class I or anti-CD1 mAbs, inhibited the response of gamma delta T cells. Antibodies to gamma delta T cell receptor, CD2, CD3, or CD11a were also inhibitory, whereas antibodies to alpha beta T cell receptor, CD4, CD5, and CD8 had no effect. Although only 40-60% of freshly isolated gamma delta T cells expressed CD28, mAbs directed against CD28 or its ligand, CD80, were markedly inhibitory. Moreover, removal of CD28+ cells from the gamma delta T cell population nearly abrogated the response to DC. These results demonstrate that resting gamma delta T cells recognize and respond to MHC class II determinants on allogeneic DC in a manner that is highly dependent on the CD28 activation pathway as well as molecules such as CD2 and CD11a that mediate cell-to-cell adhesion.
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self-cells have their own protein marker(protein embedded in the cell surface ) that will differentiate the self-cells with non-self cells.We have our own immune system(white blood cells or T-cells/marcophages/B-cells).This immune system will monitor and differentiate our cells using the antigen(protein embedded in the cell surface).If the cells does not have this kind of self marker,marcophages will activated and stimulate the T-cells to attack the cells(non-cells)
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jurkat cells\nA cell line derived from human T-cell leukaemia and used to determine the mechanism of differential susceptibility to anti-cancer drugs and radiation.
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Lymph nodes are any of numerous oval bodies, distributed throughout the lymphatic system, that produce and house lymphocytes (white blood cells formed in lymphatic tissue) and filter microorganisms and other particles from lymph. \nThey are a defense mechanism of the body against infection and disease.
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Their function in the body. For instance, cells that require a lot of communication between them and the outside have a lot of transmembrane proteins that others that are more "isolated".
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All the answers are here --> http://en.wikipedia.org/wiki/Cell_%28biology%29\n(and in your book)
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Well, I dont know if your are looking for a simple answer or extensive article. But i will try to sum it up in a simple fashion.\n\nTwo type of lymphocytes\n\nCD 4 (Helper T cell)\n\nCD 8 (Cytotoxic T cell)\n\n\nCD 8:\nis responsible for protection against and fighting :\nEndogenous Peptides e.g.\nViruses\nIntracellular Bacteria ( thankfully there are not many)\nIntracellular Parasites\nNeoantigens (tumor cells)\nGraft\n\nCD 4:\nis responsible for protection against and fighting:\nExogenous Peptides e.g\nBacteria ( which are neumerous day to day infections and            \n          varied from staphylococuss to anthrax and more; \n          like day to day cold to plaque)\nToxins\n\nHIV hampers the function of these cells and as this branch of immumity gets weaker, other branches are affected to and the individual is severly immunocompromised.
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the main part of specific immune system is Tcell and Bcell...it's hard to explain in details but i try to sum up,when the antigen enters the bode Tcell works a APC and receives antigene parts by MHC on it,MHC stimulate the Tcell to produce IL and INF and these stimulate Bcells to produce specific antibodies against Ag...some of these antibodies destroy the Ag by stimulating the complements and other parts of immune system and some Bcells convert to memory cells for the next time
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B-lymphocytes come from "Bones"\nT-lymphocytes come from "Thymus"\n\nthat's where you get the B and the T
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E-rosette test\nn.\nA test to identify T cells by mixing purified human blood lymphocytes with serum and sheep red blood cells; rosettes of red blood cells form around human T cells on incubation.
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antigen are the foerign organism to our body
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T cells are one of the variety of white blood cells which are part of the immune system. The immune system as a whole learns very early to distinguish between 'self' and 'non-self' sorts of things. The test is largely like this: "is this thing I see something acceptable (ie, self)? If not, kill it." Although the question is posed and answered in a biochemical sort of way. Self is flagged, most fundamentally as near as we can tell, by the presence of Human Leucocyte Antigens (HLA) on the surface of cells. These are highly variable things, so variable that no other person anywhere is more than a tiny bit likely to have the same bunch of them on their cells. Except, of course, for identical twins. \n\nSo T-cells transplanted into you from someone else with fail the 'is this self?' test and will be attacked as 'foreign' by your immune system. They will not survive and will provide very little beneficial effect. It's called the transplant reaction and various aspects of it have earned several Nobel Prizes. \n\nMore speculatively, it may be that immune system tissues have learned to work together, and that, in each person, the exact details of just how to do so may vary. So how my T-cells work might be just enough different than yours that, even if they could survive inside you, they might not be able to interact with the rest of your immune system so as to help much. For instance, one of the things T-cells do is to talk to other immune system cells and direct their operations; if your immune system won't listen to my T-cells, much of what they'd be trying to do would be futile.  \n\nThere is quite a bit more to learn about the detailed workings of the immune system.\n\nBlood type differences (Types A, B, O are the major gropus, but there are many subgroups such as Rh (+/-), S, ...) are a simpler version of this self / non-self business, this time involving rather fewer genes and markers on blood cells. Nevertheless, there are some antibodies (yet another immune system mechanism) which use them to recognize self v non-self, and a transfusion of the wrong blood type will cause a very severe reaction, so severe as to be life-threatening.