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  • Astrophysics  (2)
  • 4-methylumbelliferone  (1)
  • Cephalosporin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Characteristics of fluoroprobes for measuring intracellular pH
    Amsterdam : Elsevier
    Analytical Biochemistry 156 (1986), S. 202-212 
    Details
    ISSN: 0003-2697
    Keywords: 4-methylumbelliferone ; carboxyfluorescein ; fluorescence ; intracellular pH ; membrane transport
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(86)90174-0
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The transfer coefficient of the electrochemical reduction of cephalosporins and cefamycins (1993)
    Weinheim : Wiley-Blackwell
    Electroanalysis 5 (1993), S. 325-331 
    Details
    ISSN: 1040-0397
    Keywords: Cephalosporin ; Cefamycin ; Reduction ; Voltammetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electrochemical reduction at a mercury electrode of three cephalosporins and one cefamycin bearing a common R3 substituent was studied. The first one-electron transfer of the reduction process was found to be the rate-determining step in all four cases. In addition, the process took place via species adsorbed on the electrode. The analysis of the voltammetric peaks obtained in the absence of diffusion allowed us to establish the variation of the apparent transfer coefficient, αap, throughout the peak. This was found to be a linear function of the faradic current, which is consistent with the assumption that the free energy of adsorption of the antibiotics is a linear function of the coverage. In addition, the transfer coefficient was found to be markedly dependent on the nature of substituent R-and on the character of the cephalosporin or cefamycin.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140050410
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  • 3
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    Using Black Hole Mergers to Explore Structure Formation (2009)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Observations of gravitational waves from massive black hole mergers will open a new window into the era of structure formation in the early universe. Past efforts have concentrated on calculating merger rates using different physical assumptions, resulting in merger rate estimates that span a wide range (0.1 - 10(exp 4) mergers/year). We develop a semi-analytical, phenomenological model of massive black hole mergers that includes plausible combinations of several physical parameters, which we then turn around to determine how well observations with the Laser Interferometer Space Antenna (LISA) will be able to enhance our understanding of the universe during the critical z approximately equal to 5-30 epoch. Our approach involves generating synthetic LISA observable data (total BH masses, BH mass ratios, redshifts, merger rates), which are then analyzed using a Markov Chain Monte Carlo method, thus finding constraints for the physical parameters of the mergers. We find that our method works well at estimating merger parameters and that the number of merger events is a key discriminant among models, therefore making our method robust against observational uncertainties. Our approach can also be extended to more physically-driven models and more general problems in cosmology. This work is supported in part by the Cooperative Education Program at NASA/GSFC.
    Keywords: Astrophysics
    Type: American Astronomical Society meeting (AAS); Jan 03, 2009 - Jan 08, 2009; Long Beach, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Black Hole Mergers as Probes of Structure Formation (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Intense structure formation and reionization occur at high redshift, yet there is currently little observational information about this very important epoch. Observations of gravitational waves from massive black hole (MBH) mergers can provide us with important clues about the formation of structures in the early universe. Past efforts have been limited to calculating merger rates using different models in which many assumptions are made about the specific values of physical parameters of the mergers, resulting in merger rate estimates that span a very wide range (0.1 - 104 mergers/year). Here we develop a semi-analytical, phenomenological model of MBH mergers that includes plausible combinations of several physical parameters, which we then turn around to determine how well observations with the Laser Interferometer Space Antenna (LISA) will be able to enhance our understanding of the universe during the critical z 5 - 30 structure formation era. We do this by generating synthetic LISA observable data (total BH mass, BH mass ratio, redshift, merger rates), which are then analyzed using a Markov Chain Monte Carlo method. This allows us to constrain the physical parameters of the mergers. We find that our methodology works well at estimating merger parameters, consistently giving results within 1- of the input parameter values. We also discover that the number of merger events is a key discriminant among models. This helps our method be robust against observational uncertainties. Our approach, which at this stage constitutes a proof of principle, can be readily extended to physical models and to more general problems in cosmology and gravitational wave astrophysics.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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