Natural Attenuation
Mostrando 25-36 de 74 artigos, teses e dissertações.
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25. Estudos dos efeitos atmosfericos sobre as radiacoes percebidas pelos sensores a bordo de plataformas orbitais (ERTS/LANDSAT) / Studies of atmospheric effects over radiations perceived by the radar on board an orbital platforms (ERTS/LANDSAT)
The solar radiation reflected by targets on the earth s surface interacts with the atmosphere before being detected by the satellite sensors. In the visible wavelenght region, scattering by molecules and aerosols predominates on the interaction of the radiation with the atmosphere. In addition to attenuation, this interaction also contributes with diffuse ra
Publicado em: 1978
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26. Ribosome hopping and translational frameshifting are inadequate alternatives to translational attenuation in cat-86 regulation.
The induction of cat-86 by chloramphenicol has been proposed to follow the translational attenuation model. In the absence of inducer, the cat-86 gene is transcribed but remains phenotypically unexpressed because the transcripts sequester the ribosome binding site for the cat coding sequence in a stable stem-loop structure, preventing translation initiation.
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27. Diversity and Characterization of Sulfate-Reducing Bacteria in Groundwater at a Uranium Mill Tailings Site
Microbially mediated reduction and immobilization of U(VI) to U(IV) plays a role in both natural attenuation and accelerated bioremediation of uranium-contaminated sites. To realize bioremediation potential and accurately predict natural attenuation, it is important to first understand the microbial diversity of such sites. In this paper, the distribution of
American Society for Microbiology.
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28. Signature-Tagged Mutagenesis of Pasteurella multocida Identifies Mutants Displaying Differential Virulence Characteristics in Mice and Chickens
Pasteurella multocida is the causative agent of fowl cholera in birds. Signature-tagged mutagenesis (STM) was used to identify potential virulence factors in a mouse septicemia disease model and a chicken fowl cholera model. A library of P. multocida mutants was constructed with a modified Tn916 and screened for attenuation in both animal models. Mutants ide
American Society for Microbiology.
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29. Specific Detection of Dehalococcoides Species by Fluorescence In Situ Hybridization with 16S rRNA-Targeted Oligonucleotide Probes
Dehalococcoides ethenogenes is the only known cultivated organism capable of complete dehalogenation of tetrachloroethene (PCE) to ethene. The prevalence of Dehalococcoides species in the environment and their association with complete dehalogenation of chloroethenes suggest that they play an important role in natural attenuation of chloroethenes and are pro
American Society for Microbiology.
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30. TRAP, the trp RNA-binding attenuation protein of Bacillus subtilis, is a toroid-shaped molecule that binds transcripts containing GAG or UAG repeats separated by two nucleotides.
The trp RNA-binding attenuation protein of Bacillus subtilis, TRAP, regulates both transcription and translation by binding to specific transcript sequences. The optimal transcript sequences required for TRAP binding were determined by measuring complex formation between purified TRAP protein and synthetic RNAs. RNAs were tested that contained repeats of dif
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31. Metabolic Primers for Detection of (Per)chlorate-Reducing Bacteria in the Environment and Phylogenetic Analysis of cld Gene Sequences
Natural attenuation of the environmental contaminant perchlorate is a cost-effective alternative to current removal methods. The success of natural perchlorate remediation is dependent on the presence and activity of dissimilatory (per)chlorate-reducing bacteria (DPRB) within a target site. To detect DPRB in the environment, two degenerate primer sets target
American Society for Microbiology.
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32. Rapid Benzene Degradation in Methanogenic Sediments from a Petroleum-Contaminated Aquifer
In methanogenic sediments from a petroleum-contaminated aquifer, [14C]benzene was converted to 14CH4 and 14CO2 without an apparent lag. Phenol, acetate, and propionate were intermediates in benzene mineralization. These results suggest that alternative electron acceptors need not be available for there to be significant natural attenuation of benzene in some
American Society for Microbiology.
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33. Evolution of a Pathway for Chlorobenzene Metabolism Leads to Natural Attenuation in Contaminated Groundwater
Complete metabolism of chlorinated benzenes is not a feature that is generally found in aerobic bacteria but is thought to be due to a novel recombination of two separate gene clusters. Such a recombination could be responsible for adaptation of a natural microbial community in response to contamination with synthetic chemicals. This hypothesis was tested in
American Society for Microbiology.
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34. Phylogenetic and Kinetic Diversity of Aerobic Vinyl Chloride-Assimilating Bacteria from Contaminated Sites
Aerobic bacteria that grow on vinyl chloride (VC) have been isolated previously, but their diversity and distribution are largely unknown. It is also unclear whether such bacteria contribute to the natural attenuation of VC at chlorinated-ethene-contaminated sites. We detected aerobic VC biodegradation in 23 of 37 microcosms and enrichments inoculated with s
American Society for Microbiology.
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35. Bioremediation (Natural Attenuation and Biostimulation) of Diesel-Oil-Contaminated Soil in an Alpine Glacier Skiing Area
We investigated the feasibility of bioremediation as a treatment option for a chronically diesel-oil-polluted soil in an alpine glacier area at an altitude of 2,875 m above sea level. To examine the efficiencies of natural attenuation and biostimulation, we used field-incubated lysimeters (mesocosms) with unfertilized and fertilized (N-P-K) soil. For three s
American Society for Microbiology.
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36. Murine Gammaherpesvirus 68 Lacking Thymidine Kinase Shows Severe Attenuation of Lytic Cycle Replication In Vivo but Still Establishes Latency
The lytic cycle functions of gammaherpesviruses have received relatively little attention to date, at least in part due to the lack of a convenient experimental model. The murine gammaherpesvirus 68 (MHV-68) now provides such a model and allows the roles of individual lytic cycle gammaherpesvirus proteins to be evaluated in vivo. We have used MHV-68 to deter
American Society for Microbiology.