William P Johnson

Summary

Affiliation: University of Utah
Country: USA

Publications

  1. doi request reprint Direct observations of colloid retention in granular media in the presence of energy barriers, and implications for inferred mechanisms from indirect observations
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA
    Water Res 44:1158-69. 2010
  2. pmc Antimicrobial activities of commercial nanoparticles against an environmental soil microbe, Pseudomonas putida KT2440
    Priyanka Gajjar
    Department of Biology, Utah State University, Logan Utah 84321, USA
    J Biol Eng 3:9. 2009
  3. ncbi request reprint Role of grain-to-grain contacts on profiles of retained colloids in porous media in the presence of an energy barrier to deposition
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 40:3769-74. 2006
  4. ncbi request reprint Observed and simulated fluid drag effects on colloid deposition in the presence of an energy barrier in an impinging jet system
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City 84112, USA
    Environ Sci Technol 40:5015-21. 2006
  5. doi request reprint Applicability of colloid filtration theory in size-distributed, reduced porosity, granular media in the absence of energy barriers
    Eddy F Pazmino
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, United States
    Environ Sci Technol 45:10401-7. 2011
  6. ncbi request reprint Detachment-influenced transport of an adhesion-deficient bacterial strain within water-reactive porous media
    Meiping Tong
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 0111, USA
    Environ Sci Technol 39:2500-8. 2005
  7. ncbi request reprint Role of hydrodynamic drag on microsphere deposition and re-entrainment in porous media under unfavorable conditions
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 39:4012-20. 2005
  8. ncbi request reprint Pore-scale observation of microsphere deposition at grain-to-grain contacts over assemblage-scale porous media domains using X-ray microtomography
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 40:3762-8. 2006
  9. ncbi request reprint Funneling of flow into grain-to-grain contacts drives colloid-colloid aggregation in the presence of an energy barrier
    Meiping Tong
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 42:2826-32. 2008
  10. doi request reprint Surface heterogeneity on hemispheres-in-cell model yields all experimentally-observed non-straining colloid retention mechanisms in porous media in the presence of energy barriers
    Huilian Ma
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Langmuir 27:14982-94. 2011

Collaborators

  • Meiping Tong
  • David L Naftz
  • Bruce K Gale
  • Timothy D Scheibe
  • Pengfei Zhang
  • Christian O Dimkpa
  • Huilian Ma
  • Xiqing Li
  • Eddy Pazmino
  • Ximena Diaz
  • Eddy F Pazmino
  • Wenjie Huang
  • Diego P Fernandez
  • Tonguc O Tasci
  • Gregory T Carling
  • Abigail Rudd
  • Priyanka Gajjar
  • Chen Luh Lin
  • Jan D Miller
  • Jacob Trauscht
  • Brittany Dame
  • Michal Hradisky
  • Theron Miller
  • David C Richards
  • Eliana Manangon
  • Heidi Hoven
  • Rod Larsen
  • Jason Storrs
  • David Deubner
  • Diego Fernandez
  • Philip Sabey
  • Paul Fife
  • Anne J Anderson
  • Julien Pedel
  • Brian Pettee
  • David W Britt
  • Wade A Oliver
  • C L Lin

Detail Information

Publications28

  1. doi request reprint Direct observations of colloid retention in granular media in the presence of energy barriers, and implications for inferred mechanisms from indirect observations
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA
    Water Res 44:1158-69. 2010
    ..We relate these direct observations to existing literature, and in some cases offer alternative interpretations of mechanisms of retention drawn from indirect observations (e.g. via column effluent and retained concentrations)...
  2. pmc Antimicrobial activities of commercial nanoparticles against an environmental soil microbe, Pseudomonas putida KT2440
    Priyanka Gajjar
    Department of Biology, Utah State University, Logan Utah 84321, USA
    J Biol Eng 3:9. 2009
    ..The lack of toxicity from bulk materials suggests that aggregation of the NP into larger particles, possibly by factors present in the environment may reduce their nontarget antimicrobial activity...
  3. ncbi request reprint Role of grain-to-grain contacts on profiles of retained colloids in porous media in the presence of an energy barrier to deposition
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 40:3769-74. 2006
    ..The mutability and sensitivity of retained profiles to system conditions (from hyper-exponential to nonmonotonic) may reflect the interplay of different deposition mechanisms under different conditions...
  4. ncbi request reprint Observed and simulated fluid drag effects on colloid deposition in the presence of an energy barrier in an impinging jet system
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City 84112, USA
    Environ Sci Technol 40:5015-21. 2006
    ....
  5. doi request reprint Applicability of colloid filtration theory in size-distributed, reduced porosity, granular media in the absence of energy barriers
    Eddy F Pazmino
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, United States
    Environ Sci Technol 45:10401-7. 2011
    ..05. Mechanistic simulations via the Ma-Pedel-Fife-Johnson correlation equation (MPFJ) for colloid filtration predicted the experimentally observed trends in deposition with porosity when a number-based mean grain size was used...
  6. ncbi request reprint Detachment-influenced transport of an adhesion-deficient bacterial strain within water-reactive porous media
    Meiping Tong
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 0111, USA
    Environ Sci Technol 39:2500-8. 2005
    ....
  7. ncbi request reprint Role of hydrodynamic drag on microsphere deposition and re-entrainment in porous media under unfavorable conditions
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 39:4012-20. 2005
    ....
  8. ncbi request reprint Pore-scale observation of microsphere deposition at grain-to-grain contacts over assemblage-scale porous media domains using X-ray microtomography
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 40:3762-8. 2006
    ....
  9. ncbi request reprint Funneling of flow into grain-to-grain contacts drives colloid-colloid aggregation in the presence of an energy barrier
    Meiping Tong
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 42:2826-32. 2008
    ..Comparison of colloid breakthrough in porous media comprised of smooth-spherical versus angular grains demonstrated that the propensity to trigger ripening increased with the number and length of grain-to-grain contacts...
  10. doi request reprint Surface heterogeneity on hemispheres-in-cell model yields all experimentally-observed non-straining colloid retention mechanisms in porous media in the presence of energy barriers
    Huilian Ma
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
    Langmuir 27:14982-94. 2011
    ..This gradual decrease stands in sharp contrast to predictions from mean field theory that does not account for discrete surface heterogeneity...
  11. doi request reprint Gravitational settling effects on unit cell predictions of colloidal retention in porous media in the absence of energy barriers
    Huilian Ma
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, United States
    Environ Sci Technol 45:8306-12. 2011
    ....
  12. ncbi request reprint Volatile selenium flux from the Great Salt Lake, Utah
    Ximena Diaz
    Department of Geology and Geophysics, University of Utah, 135 South 1460 East Salt Lake City, Utah 84112, USA
    Environ Sci Technol 43:53-9. 2009
    ..The estimated annual flux of volatile Se was 1455 kg/year within a range from 560 to 3780 kg Se/year for the 95% confidence interval and from 970 to 2180 kg Se/year within the 68% confidence interval...
  13. ncbi request reprint Spatial variation in deposition rate coefficients of an adhesion-deficient bacterial strain in quartz sand
    Meiping Tong
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah, USA
    Environ Sci Technol 39:3679-87. 2005
    ....
  14. ncbi request reprint Nonmonotonic variations in deposition rate coefficients of microspheres in porous media under unfavorable deposition conditions
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 0111, USA
    Environ Sci Technol 39:1658-65. 2005
    ..The retained colloid profiles hold the promise to reveal processes governing colloid deposition under unfavorable conditions that are yet to be identified...
  15. ncbi request reprint Apparent decreases in colloid deposition rate coefficients with distance of transport under unfavorable deposition conditions: a general phenomenon
    Xiqing Li
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah, USA
    Environ Sci Technol 38:5616-25. 2004
    ....
  16. ncbi request reprint Colloid population heterogeneity drives hyperexponential deviation from classic filtration theory
    Meiping Tong
    Department of Geology and Geophysics, The University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 41:493-9. 2007
    ....
  17. ncbi request reprint Extending applicability of correlation equations to predict colloidal retention in porous media at low fluid velocity
    Huilian Ma
    Geology and Geophysics Department, and Chemical Engineering Department, University of Utah, Salt Lake City, Utah 84112, United States
    Environ Sci Technol 47:2272-8. 2013
    ....
  18. doi request reprint Interaction of silver nanoparticles with an environmentally beneficial bacterium, Pseudomonas chlororaphis
    Christian O Dimkpa
    Department of Biological Engineering, Utah State University, Logan, UT 84322, USA
    J Hazard Mater 188:428-35. 2011
    ..No evidence was found for loss of membrane integrity upon treatment with the NPs. Our findings indicate that growth of environmental bacteria could be impaired by Ag NPs, depending on the extent of EPS production...
  19. doi request reprint Hemispheres-in-cell geometry to predict colloid deposition in porous media
    Huilian Ma
    Department of Geology, University of Utah, Salt Lake City, Utah 84112, USA
    Environ Sci Technol 43:8573-9. 2009
    ..A correlation equation for predicting collector efficiencies in the hemispheres-in-cell model in the absence of energy barriers was developed via regression of numerical results to dimensionless parameters...
  20. doi request reprint Dissolution and nanoparticle generation behavior of Be-associated materials in synthetic lung fluid using inductively coupled plasma mass spectroscopy and flow field-flow fractionation
    Wenjie Huang
    Department of Geology and Geophysics, University of Utah, 135 South 1460 East, Salt Lake City, UT 84112, USA
    J Chromatogr A 1218:4149-59. 2011
    ....
  21. ncbi request reprint Specific UV absorbance of Aldrich humic acid: changes during transport in aquifer sediment
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City 84112, USA
    Environ Sci Technol 36:608-16. 2002
    ....
  22. ncbi request reprint Tracking of injected and resident (previously injected) bacterial cells in groundwater using ferrographic capture
    William P Johnson
    Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA
    J Microbiol Methods 54:153-64. 2003
    ..Visually observed variations in stain intensity indicated that increased unstained cell concentrations may have resulted from cell division at the low-concentration fringe of the injected plume...
  23. doi request reprint Relationships of surface water, pore water, and sediment chemistry in wetlands adjacent to Great Salt Lake, Utah, and potential impacts on plant community health
    Gregory T Carling
    Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, USA
    Sci Total Environ 443:798-811. 2013
    ....
  24. ncbi request reprint Comment on Pang et al. (2005) Filtration and transport of Bacillus subtilis spores and the F-RNA phage MS2 in a coarse alluvial gravel aquifer: implications in the estimation of setback distances
    William P Johnson
    University of Utah, Department of Geology and Geophysics, 719 WBB, 135 South 1460 East, Salt Lake City, UT 84112 0111, USA
    J Contam Hydrol 86:160-1; discussion 162. 2006
  25. ncbi request reprint Power law size-distributed heterogeneity explains colloid retention on soda lime glass in the presence of energy barriers
    Eddy Pazmino
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, United States
    Langmuir 30:5412-21. 2014
    ..In contrast, uniform and random placement of single-sized heterodomains failed to capture experimentally observed colloid retention across the range of conditions examined. ..
  26. doi request reprint Biased cyclical electrical field flow fractionation for separation of sub 50 nm particles
    Tonguc O Tasci
    Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112, United States
    Anal Chem 85:11225-32. 2013
    ....
  27. ncbi request reprint Colloid Retention in Porous Media of Various Porosities: Predictions by the Hemispheres-in-Cell Model
    Huilian Ma
    Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112
    Langmuir 26:1680-7. 2010
    ....
  28. ncbi request reprint Selenium mass balance in the Great Salt Lake, Utah
    Ximena Diaz
    Department of Geology and Geophysics, University of Utah, 135 S 1460 E Salt Lake City, UT 84112, United States
    Sci Total Environ 407:2333-41. 2009
    ..The selenium concentration trajectories were compared to those of other trace metals to assess the significance of selenium concentration trends...