Precambrian
Precambrian A name that is now used only informally to describe the longest period of geological time, which began with the consolidation of the Earth's crust and ended with the beginning of the
Cambrian Period 590 Ma ago. The Precambrian lasted approximately 4000 Ma; the rocks of this period of geological time are usually altered and few fossils with hard parts or skeletons have been found within them, although Precambrian limestone rocks in Australia, Siberia, and parts of the USA contain
stromatolites, which are believed to have been formed by cyanobacteria; frond-like impressions of a supposed plant (Charnia) have also been found. The
Ediacaran fauna is late Precambrian. Precambrian rocks outcrop extensively in shield areas such as northern Canada and the Baltic Sea. In modern usage the Precambrian is subdivided into the
Proterozoic,
Archaean, and
Priscoan.
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Lymphocyte cytochrome P450 expression: inducibility studies in male Wistar rats
Magazine article from: British Journal of Biomedical Science; 1/1/2008; ; 700+ words
; ...Expression in the induced lymphocyte samples was up to 11...results indicate that lymphocytes may provide a relatively...interaction.30 Peripheral lymphocytes are exposed to generally...metabolism mediated by lymphocyte P450 proteins may make...proteins by peripheral lymphocytes may result ...
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Lymphocyte subpopulations in human exposure to metals.(IUPAC Technical Report)
Magazine article from: Pure and Applied Chemistry; 6/1/2008; ; 700+ words
; ...immunosensitizing metals; lymphocyte subpopulations. 1. INTRODUCTION...proportions of subpopulations of lymphocytes, which are defined by the...complementary information to the lymphocyte transformation test (LTT...The major subgroups of lymphocytes, namely T, B, and natural...
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Inactivation of Lymphocytes in Blood Products Using Riboflavin Photochemical Treatment with Visible Light
Magazine article from: Photochemistry and Photobiology; 9/1/2008; ; 700+ words
; ...supernatant of control lymphocytes. RPT with visible light inactivates lymphocytes, inhibits lymphocyte proliferation and...immunocompetent T-lymphocytes. (5). At present...for inhibiting donor lymphocyte proliferation (6...
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HIV-infected CD8 lymphocytes generated through infection of activated CD8 cells.
Newspaper article from: Obesity, Fitness & Wellness Week; 11/27/2004; 700+ words
; ...HIV infection of CD8 lymphocytes was demonstrated in...of infection and CD4 lymphocyte count (R=-0.73...bright) CD4(dim) lymphocytes was significantly higher...bright) CD4(dim) lymphocytes could have a direct role in the decline in CD8 lymphocyte function that accompanies...
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CD4 Lymphocyte Percentage and HIV Disease Progression.
Magazine article from: Infectious Disease Alert; 12/1/2005; 700+ words
; ...gt; 350 CD4 lymphocytes/mm3. Source...et al. CD4 Lymphocyte Percentage...Therapy With CD4 Lymphocyte Counts > 350 Lymphocytes/mm3. J Infect...count of 500 lymphocytes/mm3. They...stratified by CD4 lymphocyte percentage...
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Estimation of CD4+ and CD8+ T-lymphocytes in human immunodeficiency virus infection and acquired immunodeficiency syndrome patients in Manipur.(Original Article)
Magazine article from: Indian Journal of Medical Microbiology; 4/1/2007; ; 700+ words
; ...molecule on the T-lymphocyte surface, the role of CD4[sup] + T-lymphocytes in HIV/AIDS patients...of CD4[sup] + T-lymphocyte count. Early in HIV...number of leucocytes and lymphocytes, including T cells...of CD8[sup] + T-lymphocyte subset begins to increase...
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Utilization of biotin in proliferating human lymphocytes
Magazine article from: The Journal of Nutrition; 2/1/2000; ; 700+ words
; ABSTRACT Lymphocytes are part of the immune system and...mitogen-stimulated, proliferating lymphocytes increase the cellular uptake of biotin...mechanisms that mediate the increase. Lymphocytes were isolated from human peripheral...
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Impaired in-vitro lymphocyte responses in patients with elevated pentacholophenol (PCP) blood levels.
Magazine article from: Archives of Environmental Health; 7/1/1995; ; 700+ words
; ...production and decreased T lymphocyte responses and IL...12-17] T and B lymphocyte defects were observed...experiments in which lymphocytes of healthy human subjects...study, we examined lymphocyte stimulation responses...
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Phenotyping Studies of Clonotypic B Lymphocytes From Patients With Multiple Myeloma by Flow Cytometry
Magazine article from: Archives of Pathology & Laboratory Medicine; 10/1/2009; ; 700+ words
; * Context.-Clonotypic B lymphocytes, monoclonal B lymphocytes sharing identical, rearranged IGH-CDR3 sequences...recurrence. Objective.-To characterize clonotypic B lymphocytes for future investigation of their role in myeloma...
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Antigen-driven murine CD4(+) T lymphocyte proliferation and interleukin-2 production are diminished by dietary (n-3) polyunsaturated fatty acids
Magazine article from: The Journal of Nutrition; 11/1/2002; ; 700+ words
; ...production and lymphocyte proliferation were...Naive CD4+ T lymphocytes from fish oil...of naive CD4+ T lymphocytes. J. Nutr. 132...acids * mice * T lymphocyte * interleukin...and diminished lymphocyte proliferation...autoreactive T lymphocytes would be expected...
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Lymphocyte Typing
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed.
...Typing Definition Lymphocyte typing focuses...percentages of lymphocytes in an individual...the proportion of lymphocytes in the blood...proportion of specific lymphocyte types. For more...proportion of the total lymphocyte numbers.) Abnormal...normal level of lymphocytes is called ...
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Lymphocyte Immune Globulin
Encyclopedia entry from: Gale Encyclopedia of Cancer
Lymphocyte immune globulin Definition Lymphocyte immune globulin is a drug used to suppress the immune system. Lymphocyte immune globulin is also known by the generic name anti-thymocyte globulin (ATG) and the brand names Atgam and Thymoglobulin...
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T Cells or T-Lymphocytes
Book article from: World of Microbiology and Immunology
T cells or T-lymphocytes When a vertebrate encounters substances...the B cells together are called the lymphocytes. The precursors of both types of...activation of the T cells. Once the T-lymphocytes are activated, they are stimulated...
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B Cells or B Lymphocytes
Book article from: World of Microbiology and Immunology
...of white blood cells. B lymphocytes are a vital part of the body...destroying the invader. B lymphocytes are produced and mature in...receptor on the surface of a T lymphocyte, which binds to the particular...cells is also gone. But, B lymphocytes remain, ready to differentiate...
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lymphocyte
Book article from: A Dictionary of Biology
lymphocyte A type of white blood cell ( leucocyte...large nucleus and little cytoplasm. Lymphocytes are formed in the lymph nodes and...antibodies . There are two populations of lymphocytes: B lymphocytes (see B cell ), which produce circulating...
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