NASA Ames Research Center

Summary

Organization: NASA Ames Research Center
Country: USA

Top Publications

  1. doi New aerosol models for the retrieval of aerosol optical thickness and normalized water-leaving radiances from the SeaWiFS and MODIS sensors over coastal regions and open oceans
    Ziauddin Ahmad
    NASA Goddard Space Flight Center, Greenbelt Road, Greenbelt, Maryland 20771, USA
    Appl Opt 49:5545-60. 2010
  2. doi The effects of three-dimensional cell culture on single myoblasts
    Michele L Marquette
    NASA JSC ORAU, 2101 NASA Rd 1, Houston, TX 77058, USA
    In Vitro Cell Dev Biol Anim 44:105-14. 2008
  3. ncbi Vibration exposure and biodynamic responses during whole-body vibration training
    Andrew F J Abercromby
    Wyle Laboratories, Inc, Houston, TX 77058, USA
    Med Sci Sports Exerc 39:1794-800. 2007
  4. ncbi Photobleaching of dissolved organic material from a tidal marsh-estuarine system of the Chesapeake Bay
    Maria Tzortziou
    Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA
    Photochem Photobiol 83:782-92. 2007
  5. ncbi Modelling and calculations of the response of tissue equivalent proportional counter to charged particles
    H Nikjoo
    USRA, NASA Johnson Space Center, Houston, Texas 77058, USA
    Radiat Prot Dosimetry 126:512-8. 2007
  6. ncbi Description of light ion production cross sections and fluxes on the Mars surface using the QMSFRG model
    Francis A Cucinotta
    NASA, Lyndon B Johnson Space Center, Houston, TX, USA
    Radiat Environ Biophys 46:101-6. 2007
  7. ncbi Chemical mapping of proterozoic organic matter at submicron spatial resolution
    Dorothy Z Oehler
    Astrobiology Group, Astromaterials Research and Exploration Science ARES Directorate, NASA Johnson Space Center, Houston, Texas 77058, USA
    Astrobiology 6:838-50. 2006
  8. ncbi Organic globules in the Tagish Lake meteorite: remnants of the protosolar disk
    Keiko Nakamura-Messenger
    Robert M Walker Laboratory for Space Science, Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, Houston, TX 77058, USA
    Science 314:1439-42. 2006
  9. ncbi Induction of micronuclei in human fibroblasts across the Bragg curve of energetic heavy ions
    H Wu
    NASA Johnson Space Center, Houston, Texas 77058, USA
    Radiat Res 166:583-9. 2006
  10. ncbi A latent class model to assess error rates in diagnosis of altitude decompression sickness
    Johnny Conkin
    National Space Biomedical Research Institute, Baylor College of Medicine Houston, TX, USA
    Aviat Space Environ Med 77:816-24. 2006

Research Grants

  1. Effects of Vestibular Loss on Orthostatic Mechanisms
    Scott Wood; Fiscal Year: 2004
  2. Vascular Remodeling and Effects of Angiogenic Inhibition
    Patricia Parsons Wingerter; Fiscal Year: 2006

Scientific Experts

Detail Information

Publications62

  1. doi New aerosol models for the retrieval of aerosol optical thickness and normalized water-leaving radiances from the SeaWiFS and MODIS sensors over coastal regions and open oceans
    Ziauddin Ahmad
    NASA Goddard Space Flight Center, Greenbelt Road, Greenbelt, Maryland 20771, USA
    Appl Opt 49:5545-60. 2010
    ..841±0.171, which is in good agreement with the AERONET value of 0.891±0.211. The average value of α retrieved using old models is 0.394±0.087, which is significantly lower than the AERONET value...
  2. doi The effects of three-dimensional cell culture on single myoblasts
    Michele L Marquette
    NASA JSC ORAU, 2101 NASA Rd 1, Houston, TX 77058, USA
    In Vitro Cell Dev Biol Anim 44:105-14. 2008
    ..These observations reveal that: (1) culture conditions in the RCCS increase the quantity of podia formation; (2) these podia increase in length with time; and (3) F-actin plays a role in podia formation...
  3. ncbi Vibration exposure and biodynamic responses during whole-body vibration training
    Andrew F J Abercromby
    Wyle Laboratories, Inc, Houston, TX 77058, USA
    Med Sci Sports Exerc 39:1794-800. 2007
    ..The purpose of this study was to quantitatively evaluate vibration exposure and biodynamic responses during typical WBVT regimens...
  4. ncbi Photobleaching of dissolved organic material from a tidal marsh-estuarine system of the Chesapeake Bay
    Maria Tzortziou
    Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA
    Photochem Photobiol 83:782-92. 2007
    ..The model accurately, and consistently, predicted the observed dependence of CDOM photobleaching on the spectral quality of solar exposure...
  5. ncbi Modelling and calculations of the response of tissue equivalent proportional counter to charged particles
    H Nikjoo
    USRA, NASA Johnson Space Center, Houston, Texas 77058, USA
    Radiat Prot Dosimetry 126:512-8. 2007
    ..3-100 MeV, is presented. The distributions show the clustering properties of protons of different energies in a 100 nm by 100 nm cylinder...
  6. ncbi Description of light ion production cross sections and fluxes on the Mars surface using the QMSFRG model
    Francis A Cucinotta
    NASA, Lyndon B Johnson Space Center, Houston, TX, USA
    Radiat Environ Biophys 46:101-6. 2007
    ..Finally, we consider sensitivity assessments of the impact of the Martian atmospheric composition on particle fluxes at the surface...
  7. ncbi Chemical mapping of proterozoic organic matter at submicron spatial resolution
    Dorothy Z Oehler
    Astrobiology Group, Astromaterials Research and Exploration Science ARES Directorate, NASA Johnson Space Center, Houston, Texas 77058, USA
    Astrobiology 6:838-50. 2006
    ....
  8. ncbi Organic globules in the Tagish Lake meteorite: remnants of the protosolar disk
    Keiko Nakamura-Messenger
    Robert M Walker Laboratory for Space Science, Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, Houston, TX 77058, USA
    Science 314:1439-42. 2006
    ..The globules resemble cometary carbon, hydrogen, oxygen, and nitrogen (CHON) particles, suggesting that such grains were important constituents of the solar system starting materials...
  9. ncbi Induction of micronuclei in human fibroblasts across the Bragg curve of energetic heavy ions
    H Wu
    NASA Johnson Space Center, Houston, Texas 77058, USA
    Radiat Res 166:583-9. 2006
    ..These results confirm the hypothesis that severely damaged cells at the Bragg peak are more likely to go through reproductive death and not be evaluated for micronuclei...
  10. ncbi A latent class model to assess error rates in diagnosis of altitude decompression sickness
    Johnny Conkin
    National Space Biomedical Research Institute, Baylor College of Medicine Houston, TX, USA
    Aviat Space Environ Med 77:816-24. 2006
    ..We used a Latent Class Model (LCM) incorporating inter-rater agreement to estimate false-positive and negative rates of DCS diagnosis for each of six symptomatic (covariate) strata...
  11. ncbi Asteroid and comet impacts: the ultimate environmental catastrophe
    David Morrison
    Working Group on Near Earth Objects, International Astronomical Union 14660 Fieldstone, Saratoga, CA 95070, USA
    Philos Trans A Math Phys Eng Sci 364:2041-54. 2006
    ..However, impacts take place so rarely that they have only recently been recognized as a significant natural hazard. Concerted international action to deal with impacts depends on increased public awareness...
  12. ncbi cWINNOWER algorithm for finding fuzzy DNA motifs
    Shoudan Liang
    NASA Ames Research Center, NASA Advanced Supercomputing Division, Moffett Field, CA 94035, USA
    Proc IEEE Comput Soc Bioinform Conf 2:260-5. 2003
    ..Our most sensitive algorithm, which counts four-member sub-cliques, needs a minimum of only 13 signals to detect motifs in a sequence of length N = 12,000 for (l,d) = (15,4)...
  13. ncbi Nitrogen fixation by corona discharge on the early precambrian Earth
    Delphine Nna-Mvondo
    Laboratorio de Quimica de Plasmas y Estudios Planetarios, Instituto de Ciencias Nucleares, Universidad Autonoma de Mexico, Circuito Exterior, Ciudad Universitaria, Apartado Postal 70 543, Mexico Distrito Federal, 04510, Mexico
    Orig Life Evol Biosph 35:401-9. 2005
    ..These low rates of syntheses indicate that corona discharges as point discharges on the clouds and ground did not play a significant role in the overall pool of reactive nitrogen needed for the emergence and sustainability of life...
  14. ncbi A procedure for benchmarking laboratory exposures with 1 A GeV iron ions
    John W Wilson
    NASA Langley Research Center, Hampton, VA 23681 2199, USA
    Adv Space Res 35:185-93. 2005
    ..The benchmark quantities will be dose, track averaged LET, dose averaged LET, fraction of iron ion remaining, and fragment energy spectra after 23 g/cm2 of polymethyl metachrylate...
  15. doi Planetary science. Titan's hidden ocean
    Christophe Sotin
    Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
    Science 319:1629-30. 2008
  16. ncbi Centrifugation protocol for the NASA Artificial Gravity-Bed Rest Pilot Study
    Maneesh Arya
    Wyle Life Sciences, 1290 Hercules, Houston, TX 77058, USA
    J Gravit Physiol 14:P5-8. 2007
    ..Control subjects were instrumented but did not receive any centrifugation. This paper provides details on the centrifuge protocol development and efficacy...
  17. doi Characterization and validation of a bioluminescent bioreporter for the direct detection of Escherichia coli
    Michele Birmele
    Applied Genetics Technology Core, Dynamac Corp, Kennedy Space Center, Florida 32899, United States
    J Microbiol Methods 75:354-6. 2008
    ....
  18. ncbi NASA-modified precipitation products to improve USEPA nonpoint source water quality modeling for the Chesapeake Bay
    Joseph Nigro
    Science Systems and Applications, Inc, 10210 Greenbelt Rd, Suite 600, Lanham, MD 20706, USA
    J Environ Qual 39:1388-401. 2010
    ..In almost every case, the modeling performance of HSPF increased when using the NASA-modified precipitation data, resulting in better streamflow statistics and, potentially, in improved water quality assessment...
  19. doi Effects of high intensity exercise on biventricular function assessed by cardiac magnetic resonance imaging in endurance trained and normally active individuals
    Jessica M Scott
    University of British Columbia, Vancouver, BC, Canada
    Am J Cardiol 106:278-83. 2010
    ..05). In conclusion, biventricular systolic and diastolic dysfunction occurred after 14 minutes of high-intensity exercise in ET athletes, a phenomenon not observed in NA subjects...
  20. doi Identification of carbonate-rich outcrops on Mars by the Spirit rover
    Richard V Morris
    NASA Johnson Space Center, Houston, TX 77058, USA
    Science 329:421-4. 2010
    ..The Gusev carbonate probably precipitated from carbonate-bearing solutions under hydrothermal conditions at near-neutral pH in association with volcanic activity during the Noachian era...
  21. doi An evolving view of Saturn's dynamic rings
    J N Cuzzi
    Ames Research Center, NASA, Mail Stop 245 3, Moffett Field, CA 94035 1000, USA
    Science 327:1470-5. 2010
    ..It remains unclear whether the vigorous evolutionary processes to which the rings are subject imply a much younger age than that of the solar system. Processes on view at Saturn have parallels in circumstellar disks...
  22. ncbi Variations in the Sun's meridional flow over a solar cycle
    David H Hathaway
    NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
    Science 327:1350-2. 2010
    ..It was faster at sunspot cycle minimum than at maximum and substantially faster on the approach to the current minimum than it was at the last solar minimum. This result may help to explain why this solar activity minimum is so peculiar...
  23. doi Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy
    Sarah A Tedder
    Advanced Sensing and Optical Measurement Branch, NASA Langley Research Center, 18 Langley Boulevard, Hampton, Virginia 23681 2199, USA
    Appl Opt 49:1305-13. 2010
    ..The detection of these lines gives the system the capability to measure temperature and species concentrations in regions of flow containing pure hydrogen fuel at room temperature...
  24. ncbi Lower limb position during treadmill jogging and fast running in microgravity
    Meghan E Everett
    NASA Johnson Space Center, Houston, TX, USA
    Aviat Space Environ Med 80:882-6. 2009
    ..A kinematic comparison of locomotion between 1 G and microgravity will provide information to evaluate the potential efficacy of fast running as an in-flight exercise countermeasure...
  25. pmc In vivo demonstration of a self-sustaining, implantable, stimulated-muscle-powered piezoelectric generator prototype
    B E Lewandowski
    Bioscience and Technology Branch, NASA Glenn Research Center, 21000 Brookpark Rd, Cleveland, OH 44135, USA
    Ann Biomed Eng 37:2390-401. 2009
    ..Larger muscles and circuitry improvements are expected to increase available power. An implanted, self-replenishing power source has the potential to augment implanted battery or transcutaneously powered electronic medical devices...
  26. ncbi Infrared limb sounding of Titan with the Cassini Composite InfraRed Spectrometer: effects of the mid-IR detector spatial responses
    Conor A Nixon
    University of Maryland, Department of Astronomy, College Park, Maryland 20742, USA
    Appl Opt 48:1912-25. 2009
    ..This result has implications not just for CIRS data analysis but for other similar instrumental applications...
  27. pmc Enrichment of the amino acid L-isovaline by aqueous alteration on CI and CM meteorite parent bodies
    Daniel P Glavin
    National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD 20771, USA
    Proc Natl Acad Sci U S A 106:5487-92. 2009
    ....
  28. doi Energy transduction inside of amphiphilic vesicles: encapsulation of photochemically active semiconducting particles
    David P Summers
    Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, USA
    Orig Life Evol Biosph 39:127-40. 2009
    ....
  29. doi Strategies of healthy adults walking on a laterally oscillating treadmill
    Rachel A Brady
    Wyle Integrated Science and Engineering Group, Houston, TX 77058, USA
    Gait Posture 29:645-9. 2009
    ..This finding suggests that normal adults have innate and varied preferences for optimizing gait stability, some depending more heavily on vision (FIS group) and others on proprioception (FTB group)...
  30. ncbi Critique of the equivalent air altitude model
    Johnny Conkin
    Universities Space Research Association, 3600 Bay Area Boulevard, Houston, TX 77058 2769, USA
    Aviat Space Environ Med 79:975-82. 2008
    ..Adjustment through probabilistic statistical modeling to match the current limited experimental observations is one approach to a better isohypoxic model...
  31. ncbi Initial characterization of the microgravity environment of the international space station: increments 2 through 4
    Kenol Jules
    NASA Glenn Research Center, Cleveland, OH 44135 3191, USA
    Acta Astronaut 55:855-87. 2004
    ....
  32. ncbi Thermocapillary migration of a drop: an exact solution with Newtonian interfacial rheology and stretching/shrinkage of interfacial area elements for small Marangoni numbers
    R Balasubramaniam
    National Center for Microgravity Research, NASA Glenn Research Center, Mail Stop 110 3, Cleveland, OH 44135, USA
    Ann N Y Acad Sci 1027:303-10. 2004
    ..This solution is then used to calculate the slightly deformed shape of the drop from a sphere...
  33. ncbi Loss of signal transduction and inhibition of lymphocyte locomotion in a ground-based model of microgravity
    Alamelu Sundaresan
    Cellular Biotechnology Program, Wyle Laboratories, Life Sciences Systems and Services, Houston, Texas 77058, USA
    In Vitro Cell Dev Biol Anim 38:118-22. 2002
    ..Therefore, in MMG, lymphocyte calcium signaling pathways were functional, with defects occurring at either the level of PKC or upstream of PKC...
  34. ncbi Theoretical and practical considerations of staggered crop production in a BLSS
    G W Stutte
    Dynamac Corporation, Kennedy Space Center, FL 32899, USA
    Life Support Biosph Sci 6:287-91. 1999
    ..This morphological response required an increase in planting density to maintain full canopy coverage. Plants grown in staggered production used available light more efficiently than the batch planting due to increased side lighting...
  35. ncbi Bulk and stable isotopic compositions of carbonate minerals in Martian meteorite Allan Hills 84001: no proof of high formation temperature
    A H Treiman
    Lunar and Planetary Institute, Houston, Texas 77058, USA
    Meteorit Planet Sci 33:737-42. 1998
    ..Other methods (possibly less direct) will have to be used to determine the formation temperature of the carbonates in ALH84001...
  36. ncbi The spacing of the interstellar 6.2 and 7.7 micron emission features as an indicator of polycyclic aromatic hydrocarbon size
    D M Hudgins
    NASA Ames Research Center, Moffett Field, CA 94035, USA
    Astrophys J 513:L69-73. 1999
    ..Furthermore, the profile of the 1610 cm-1 (6.2 microns) interstellar band indicates that PAHs containing as few as 20 carbon atoms contribute to this feature...
  37. ncbi The IRS 1 circumstellar disk, and the origin of the jet and CO outflow in B5
    W D Langer
    Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109, USA
    Astrophys J 468:L41-4. 1996
    ..The intrinsic opening angle is in the range of 60 degrees-90 degrees which leads to significant interaction between outflow and infall...
  38. ncbi Of red planets and indigo computers: Mars database visualization as an example of platform downsizing
    M K Kaiser
    NASA Ames Research Center, Moffett Field, California, USA
    Behav Res Methods Instrum Comput 29:48-53. 1997
    ..Finally, we discuss how insights gleaned from an understanding of human visual perception can guide these design decisions, and suggest new options for visualization hardware and software...
  39. ncbi Tactile responses in the granule cell layer of cerebellar folium crus IIa of freely behaving rats
    M J Hartmann
    California Institute of Technology, Biology Department, Pasadena, CA 91125, USA
    J Neurosci 21:3549-63. 2001
    ....
  40. ncbi Crystallization and initial X-ray diffraction analysis of human pyruvate dehydrogenase
    E Ciszak
    Universities Space Research Association, 4950 Corporate Drive, Huntsville, AL 35803, USA
    Acta Crystallogr D Biol Crystallogr 57:465-8. 2001
    ..2 A. Crystals diffracted to a minimum d spacing of 2.5 A. The asymmetric unit contains one alpha(2)beta(2) tetrameric E1 assembly; self-rotation function analysis showed a pseudo-twofold symmetry relating the two alphabeta dimers...
  41. ncbi Temporary arterial shunts to maintain limb perfusion after arterial injury: an animal study
    D L Dawson
    Department of General Surgery, Wilford Hall Medical Center, Lackland AFB, Texas, USA
    J Trauma 47:64-71. 1999
    ..This study examined the adequacy of limb blood flow with shunt use, non-heparin-bonded shunt patency over prolonged periods, and the safety of this technique...
  42. ncbi Identification of two sources of carbon monoxide in comet Hale-Bopp
    M A DiSanti
    Department of Physics, The Catholic University of America, Washington, DC 20064, USA
    Nature 399:662-5. 1999
    ..The remaining CO arises in the coma, probably through thermal destruction of more complex molecules...
  43. ncbi Collagen cross-link excretion during space flight and bed rest
    S M Smith
    Life Sciences Research Laboratories, National Aeronautics and Space Administration, Johnson Space Center, Houston, Texas 77058, USA
    J Clin Endocrinol Metab 83:3584-91. 1998
    ..e. within days to weeks) suggests that alterations in bone metabolism are an early effect of weightlessness. These studies are important for a better understanding of bone metabolism in space crews and in those who are bedridden...
  44. ncbi Word-identification priming for ignored and attended words
    M Stone
    NASA Ames Research Center, California 94035 1000, USA
    Conscious Cogn 7:238-58. 1998
    ..Thus, word-identification priming was reduced even when word identification occurred at study. Word-identification priming may depend on awareness of word identity at the time of study...
  45. ncbi Psychophysica: Mathematica notebooks for psychophysical experiments (cinematica--psychometrica--quest)
    A B Watson
    NASA Ames Research Center, Moffett Field, CA 94035 1000, USA
    Spat Vis 10:447-66. 1997
    ..Functions are provided for calibrated visual displays, for fitting and plotting of psychometric functions, and for the QUEST adaptive staircase procedure. The functions are written in the Mathematica programming language...
  46. ncbi HPLC/ESI-quadrupole ion trap mass spectrometry for characterization and direct quantification of amphoteric and nonionic surfactants in aqueous samples
    Lanfang H Levine
    Dynamac Corporation, Kennedy Space Center, Florida 32899, USA
    Anal Chem 74:2064-71. 2002
    ..The procedure was successfully employed for the assessment of CAPB and AE biodegradation in a hydroponic plant growth system used as a graywater bioreactor...
  47. ncbi Hydrogen in rocks: an energy source for deep microbial communities
    Friedemann Freund
    SETI Institute and Department of Physics, San Jose State University, San Jose, CA, USA
    Astrobiology 2:83-92. 2002
    ..In the water-saturated, biologically relevant upper portion of the rock column, the diffusion of H2 out of the minerals will be buffered by H2 saturation of the intergranular water film...
  48. ncbi Bioinspired engineering of exploration systems for NASA and DoD
    Sarita Thakoor
    Jet Propulsion Laboratory, Caltech Pasadena, CA 91109, USA
    Artif Life 8:357-69. 2002
    ..We describe a few future mission scenarios for Mars exploration, uniquely enabled by these newly developed biomorphic flyers...
  49. ncbi Effects of Gravity on ZBLAN Glass Crystallization
    Dennis S Tucker
    SD71, NASA NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 1912, USA
    Ann N Y Acad Sci 1027:129-37. 2004
    ..When processed in unit gravity the glass crystallized, but when processed in reduced gravity, crystallization was suppressed. A possible explanation involving shear thinning is presented to explain these results...
  50. ncbi Skeletal phenotype of growing transgenic mice that express a function-perturbing form of beta1 integrin in osteoblasts
    R K Globus
    Life Sciences Division, NASA Ames Research Center, Moffett Field, California 94035, USA
    Calcif Tissue Int 76:39-49. 2005
    ..Together, these results suggest that integrin signals generated during growth enhance the acquisition of a skeletal mass, structure, and strength to withstand the mechanical loads generated by weight-bearing...
  51. ncbi Mineralogy at Gusev Crater from the Mössbauer spectrometer on the Spirit Rover
    R V Morris
    NASA Johnson Space Center, Houston, TX, USA
    Science 305:833-6. 2004
    ..The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crater...
  52. pmc The force exerted by the membrane potential during protein import into the mitochondrial matrix
    Karim Shariff
    National Aeronautics and Space Administration, Ames Research Center, Moffett Field, California 94035, USA
    Biophys J 86:3647-52. 2004
    ..5 +/- 2.5 pN catalyze the unfolding of barnase in those experiments. A comparison of these results with unfolding forces measured using atomic force microscopy is made...
  53. ncbi Effects of hypergravity exposure on plasma oxytocin concentration in pregnant and lactating rat dams
    Lisa A Baer
    Life Sciences Division, NASA Ames Research Center, Moffett Field, CA 94035, USA
    J Gravit Physiol 9:P205-6. 2002
    ..Changes in lactational hormones and nursing behavior by dams exposed to hg do not account for reduced body masses of their offspring...
  54. ncbi Microbial astronauts: assembling microbial communities for advanced life support systems
    M S Roberts
    Dynamac Inc, DYN 3, John F Kennedy Space Center, FL 32899, USA
    Microb Ecol 47:137-49. 2004
    ....
  55. ncbi Evaluation of treadmill exercise in a lower body negative pressure chamber as a countermeasure for weightlessness-induced bone loss: a bed rest study with identical twins
    Scott M Smith
    Human Adaptation and Countermeasures Office, NASA Lyndon B Johnson Space Center, Houston, Texas 77058, USA
    J Bone Miner Res 18:2223-30. 2003
    ..Eight pairs of identical twins were randomly assigned to sedentary control or exercise groups. Exercise within LBNP decreased the bone resorption caused by bed rest and may provide a countermeasure for spaceflight...
  56. ncbi Truly incomplete and complex exchanges in prematurely condensed chromosomes of human fibroblasts exposed in vitro to energetic heavy ions
    Honglu Wu
    National Space Biomedical Research Institute, Baylor College of Medicine, NASA Johnson Space Center, Houston, Texas 77058, USA
    Radiat Res 160:418-24. 2003
    ..After 0.7 Gy of iron ions, most complex aberrations were found to involve three or four chromosomes, which is a likely indication of the maximum number of chromosome domains traversed by a single iron-ion track...
  57. ncbi Biological effectiveness of accelerated particles for the induction of chromosome damage measured in metaphase and interphase human lymphocytes
    Kerry George
    Wyle Laboratories, 1290 Hercules Drive, Houston, Texas 77058, USA
    Radiat Res 160:425-35. 2003
    ....
  58. ncbi Dual-task interference with equal task emphasis: graded capacity sharing or central postponement?
    Eric Ruthruff
    NASA Ames Research Center, Moffett Field, California 94035, USA
    Percept Psychophys 65:801-16. 2003
    ..However, this pattern is consistent with the existence of a structural central bottleneck...
  59. ncbi Characterization of iron, manganese, and copper synthetic hydroxyapatites by electron paramagnetic resonance spectroscopy
    B Sutter
    National Research Council, NASA Ames Research Center, Moffett Field, CA 94035, USA
    Soil Sci Soc Am J 66:1359-66. 2002
    ..The Fe-, Mn-, and Cu-SHA materials are potential slow release sources of Fe, Mn, and Cu for ALS and terrestrial cropping systems...
  60. ncbi Analysis of complex-type chromosome exchanges in astronauts' lymphocytes after space flight as a biomarker of high-LET exposure
    Kerry George
    Wyle Life Sciences, Houston, TX, USA
    J Radiat Res 43:S129-32. 2002
    ..It appears that the use of complex-type exchanges as biomarker of radiation quality in vivo after low-dose chronic exposure in mixed radiation fields is hampered by statistical uncertainties...
  61. ncbi Mathematical model of diffusion-limited evolution of multiple gas bubbles in tissue
    R Srini Srinivasan
    Wyle Laboratories, Life Sciences, Systems and Service, Houston, TX 77058 2769, USA
    Ann Biomed Eng 31:471-81. 2003
    ..For given decompression and tissue volume, bubble growth is sustained only if the bubble number density is below a certain maximum...
  62. ncbi Comparison of ground-based and space flight energy expenditure and water turnover in middle-aged healthy male US astronauts
    H W Lane
    Nutrition and Metabolism Laboratory, National Aeronautics and Space Administration, Johnson Space Center, Houston, TX 77058, USA
    Am J Clin Nutr 65:4-12. 1997
    ..8 +/- 0.5 L/d), probably because of lower fluid intakes and perspiration loss during flight. This study confirmed that the WHO calculation can be used for male crew members' energy requirements during short space flights...

Research Grants3

  1. Effects of Vestibular Loss on Orthostatic Mechanisms
    Scott Wood; Fiscal Year: 2004
    ..This study will provide new information on how vestibular loss might increase susceptibility for orthostatic intolerance, and will provide new insights on otolith- autonomic human subjects. ..
  2. Vascular Remodeling and Effects of Angiogenic Inhibition
    Patricia Parsons Wingerter; Fiscal Year: 2006
    ..The CAM continues to serve as a convenient testbed for ongoing development of fractal methods and for examination of effects of human regulators on angiogenesis and vascular remodeling. ..