Chemical resistant

Xem 1-20 trên 57 kết quả Chemical resistant
  • Tham khảo tài liệu 'organic chemicals in sewage sludges', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The drug concentration inside multidrug-resistant cells is the outcome of competition between the active export of drugs by drug efflux pumps, such as P-glycoprotein (Pgp), and the passive permeation of drugs across the plasma membrane. Thus, reversal of multidrug resistance (MDR) can occur either by inhibition of the efflux pumps or by acceleration of the drug per-meation.

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  • Three point mutations R335S, L336V and V476L, distin-guish the sequence of a cytochrome P450CYP6A2 variant assumed to be responsible for 1,1,1-trichloro-2,2-bis-(4¢-chlorophenyl)ethane (DDT) resistance in theRDDT R strain ofDrosophila melanogaster. To determine the impact of each mutation on the function of CYP6A2, the wild-type enzyme (CYP6A2wt) ofCyp6a2was expressed inEscheri-chia colias well as three variants carrying a single mutation, the double mutant CYP6A2vSV and the triple mutant CYP6A2vSVL. All CYP6A2 variants were less stable than the CYP6A2wt protein. ...

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  • To test thioredoxin resistance to oxidizing free radicals, we have studied the one-electron oxidation of wild-type thio-redoxin and of two forms with the point mutations D30A and W35A, using azide radicals generated byc-ray or pulse radiolysis. The oxidation patterns of wild-type thioredoxin and D30A are similar. In these forms, Trp35 is the primary target and is repaired by one-electron reduction; first by intramolecular electron transfer from tyrosine, and then fromother residues. Conversely, duringoxidationofW35A, Trp13 is poorly reactive.

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  • Leukocytes and other cells show an enhanced intensity of mobile lipid in their 1 H NMR spectra under a variety of conditions.Such conditions include stimulation, which has recently been shown to involve detergent-resistant, plasma membranedomains (DRMs)oftencalled lipidrafts.As there ismuchspeculationsurrounding theoriginof cellularNMR-visible lipid, we analysed subcellular fractions, including DRMs, by NMR spectroscopy.

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  • The Tet repressor protein (TetR) regulates transcription of a family of tetracycline (tc) resistance determinants in Gram-negative bacteria. The resistance protein TetA, a membrane-spanning H + -[tcÆM]+ antiporter, must be sen-sitively regulated because its expression is harmful in the absence of tc, yet it has to be expressed before the drugs’ concentration reaches cytoplasmic levels inhibitory for protein synthesis.

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  • The present study aimed to elucidate the contribution of the intracellular binding of drugs to multidrug resistance. For this purpose, uptake of rhod-amines was studied in cells whose mitochondria had been uncoupled with carbonyl cyanide m-chlorophenylhydrazone.

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  • Basic knowledge of cement a), Chemical composition of cement and hydration of clinker compounds Of the above figures, Alite has the most first hydrate reaction, therefore Alite contributes considerably to short term strength and the hydrate reaction completely finishes for a few months. While the hydrate reaction speed of belite is lower. As the result, the development of the short term strength is low, but it effects the long term strength. Alite reaction with water is the most activity, and interstitial material is also high reaction with water.(see figure 1)...

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  • Since all of these flavors are present in beer, it is important that beer judges completely coat the inside of their mouths with beer when evaluating it and that the beer be swallowed. As is true for the scent receptors in the nose, different people have different densities of taste buds and, thus, have different sensitivities to various flavors. Also, taste buds can be damaged (e.g., being burnt by hot food or through exposure to irritants like spicy foods, smoking, or other chemicals), so a judge’s sensitivity may be diminished until tastebuds can regenerate (about 10 days).

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  • The task of providing a reliable replacement for anatomic loss falls short of the original biology in both elegance and durability. Although prosthetic replacements are poor substitutes for healthy biology, disease and destruc- tion leave clinicians few alternatives. Teeth and their prosthetic replacement typify this dilemma. The healthy tooth is a thing to be admired – strong, compliant, chemically resistant, and even beautiful.

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  • The following sections provide an overview of the technical and qualitative characteristics of a wide range of alternative fuels that can replace coal in cement kilns. These fuels include agricultural and non-agricultural biomass, chemical and hazardous wastes, petroleum-based wastes, and miscellaneous waste fuels. Each of these alternatives are described in detail, including a discussion of average substitution rates, energy and water content of the fuels, carbon dioxide emissions factors, and change in carbon emissions per ton1 of coal replacement.

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  • Under moderate conditions the body automatically adjusts itself to keep its temperature within safe limits. Sweating is the body's most efficient means of getting rid of heat, but the more humid the air, the harder it is for sweat to evaporate and the harder it is for the body to cool off. Under hot and humid conditions, work becomes harder because much of our blood is going to the surface of the body, and less is available to the active muscles. Loss of salt from sweating can result in fatigue.

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  • We used t-tests with robust standard errors (to account for clustering caused by multiple nutrient comparisons within studies) to test the null hypothesis of no evidence of a difference between organically and conventionally produced food in content of nutrients and other substances. P-values were calculated to determine the significance of observed differences; p-values of less than 0.05 were used as a basis for evidence of significant differences between organically and conventionally produced foodstuffs.

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  • Petroleum contaminant decomposition and in-situ destruction may be accomplished using chemical oxidation technologies. In contrast to other remedial technologies, contaminant reduction can be seen in short time frames (e.g., weeks or months). As discussed in this chapter, a variety of chemical oxidants and application techniques can be used to bring oxidizing materials into contact with subsurface contaminants to remediate the contamination.

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  • In addition to emerging chemical contaminants, there is also the threat of emerging pathogens – those that are appearing in human populations for the first time, or have occurred before but are increasing in incidence or are expanding into areas where they have not been reported (WHO 2003a). Not only do water-related diseases remain a leading cause of global morbidity and mortality, but several studies have confirmed that the variety of disease is expanding and the incidence of many water-related microbial diseases is increasing (WHO 2003a).

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  • Candida albicansis the most prevalent yeast pathogen in humans, and recently it has become increasingly resistant to the current antifungal agents. In this study we investigatedC. albicansdihydroorotate dehydroge-nase (DHODH, EC 1.3.99.11), which catalyzes the fourth step ofde novo pyrimidine synthesis, as a new target for controlling infection.

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  • Some limitations are imposed by incompatibilities of barrier material with chemical agents. Chemical resistant gloves, suits, etc. are rated on the ability to prevent contact with special types of chemicals. This performance is usually rated in terms of "breakthrough times", that is how long it takes for a particular chemical to pass through a particular barrier material under test conditions. This kind of information should be obtained from manufacturers (or from other reputable sources of technical information such as NIOSH, OSHA, etc.

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  • Some organic pest management strategies include using crop rotations that disrupt the pest life cycle, improving soil quality, practicing good sanitation, using optimum planting densities, timing planting and transplanting operations to avoid high pest populations, employing biological control, and growing resistant varieties. Approved pesticides that have been listed in the grower’s OSP can be used in organic production, but should be used as judiciously and as specific to the pest organism as possible.

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  • Mesotrypsin, an inhibitor-resistant human trypsin isoform, does not acti-vate or degrade pancreatic protease zymogens at a significant rate. These observations led to the proposal that mesotrypsin is a defective digestive protease on protein substrates. Surprisingly, the studies reported here with a1 -antitrypsin (a1AT) revealed that, even though mesotrypsin was com-

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  • Horizontal gene transfer has been a major force for genome plasticity over evolutionary history, and is largely responsible for fitness-enhancing traits, including antibiotic resistance and virulence factors. In particular, for adap-tation of prokaryotes to extreme environments, lateral gene transfer seems to have played a crucial role.

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