Mtec
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Comparison of thermotolerant coliforms and Escherichia coli densities in freshwater bodies
Fecal bacterial indicator analyses have been widely used for monitoring the water quality. This study was designed to determine the ratio between the density of Escherichia coli and other Thermotolerant Coliforms (TtC) bacteria from freshwater samples collected for a two-year period of monitoring. TtC were enumerated by membrane filtration on mFC agar. E. co
Brazilian Journal of Microbiology. Publicado em: 2012-06
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2. Promiscuous gene expression in medullary thymic epithelial cells is connected in network where the Aire gene is an upstream modulator / O papel modulador do gene Aire (autoimmune regulator) sobre redes de expressão gênica em células tímicas epiteliais medulares
The expression of tissue restricted antigens (TRAs) in thymus by medullary thymic epithelial cells (mTECs) is essential for the central selftolerance of T cells. Due to heterogeneity of autoantigen representation this phenomenon has been termed promiscuous gene expression (PGE), in which the autoimmune regulator (Aire) gene plays a role as main positive tran
Publicado em: 2008
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3. Trypanosoma cruzi infection and/or administration of the nonsteroidal anti-inflammatory nimesulide increase the number of colonic crypts overexpressing metallothioneins in rat colon carcinogenesis
Trypanosoma cruzi infection and nonsteroidal anti-inflammatory drugs inhibit colorectal carcinogenesis by mechanisms not completely known and metallothionein proteins (MTs) may be involved in this process. Sixty-six male Wistar rats weighing 90 to 120 g were randomly divided into seven groups (GI to GVII). GI, GII and GIII animals were subcutaneously infecte
Brazilian Journal of Medical and Biological Research. Publicado em: 2006-07
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4. Comparison of four membrane filter methods for fecal coliform enumeration.
Four membrane filter methods fecal coliform enumeration were evaluated and compared in six laboratories based on determination of accuracy, specificity, upper counting limit, and recovery comparability. Recovery accuracy with pure cultures ranged from 89 to 100% for m-FC, mTEC (a procedure developed for thermotolerant Escherichia coli), and m-FC2 methods (th
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5. A new membrane filtration medium for simultaneous detection and enumeration of Escherichia coli and total coliforms.
Recovery of total coliforms and Escherichia coli on a new membrane filtration (MF) medium was evaluated with 25 water samples from seven states. Testing of the new medium, m-ColiBlue24 broth, was conducted according to a U.S. Environmental Protection Agency protocol. For comparison, this same protocol was used to measure recovery of total coliforms and E. co
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6. New medium for the simultaneous detection of total coliforms and Escherichia coli in water.
A new membrane filter agar medium (MI agar) containing a chromogen, indoxyl-beta-D-glucuronide, and a fluorogen, 4-methylumbelliferyl-beta-D-galactopyranoside, was developed to simultaneously detect and enumerate Escherichia coli and total coliforms (TC) in water samples on the basis of their enzyme activities. TC produced beta-galactosidase, which cleaved 4
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7. Comparative evaluation of modified m-FC and m-TEC media for membrane filter enumeration of Escherichia coli in water.
Two media used to detect fecal coliforms in water by membrane filtration, m-FC and m-TEC, were modified and supplemented with the chromogenic substrate 5-bromo-6-chloro-3-indoyl-beta-D-glucuronide (BCIG) and were compared for quantitative recovery of Escherichia coli. Student's t test of data from 181 water samples of sewage, rivers, lakes, and wells did not
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8. Evaluation of test media for routine monitoring of Escherichia coli in nonpotable waters.
Six test media, m-TEC, m-TEC with 4-methylumbelliferyl-beta-D-glucuronide (MUG), lauryl tryptose agar (LTA) with MUG, LTA with 5-bromo-4-chloro-3-indolyl-beta-D-glucuronide (X-Glue), EC medium with MUG, and lauryl tryptose broth with MUG, were evaluated for their usefulness in enumerating Escherichia coli in nonpotable waters on a routine basis. The media we
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9. Thymus-specific deletion of insulin induces autoimmune diabetes
Insulin expression in the thymus has been implicated in regulating the negative selection of autoreactive T cells and in mediating the central immune tolerance towards pancreatic β-cells. To further explore the function of this ectopic insulin expression, we knocked out the mouse Ins2 gene specifically in the Aire-expressing medullary thymic epithelial cell
Nature Publishing Group.
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10. Evaluation of commercial presence-absence test kits for detection of total coliforms, Escherichia coli, and other indicator bacteria.
Evaluations of several commercial presence-absence (P-A) test kits were performed over a 6-month period in 1990 by using the Ontario Ministry of the Environment (MOE) P-A test for comparison. The general principles of the multiple-tube fermentation technique formed the basis for conducting the product evaluations. Each week, a surface water sample was dilute