Ahmed Heikal - Publications

Affiliations: 
Pennsylvania State University, State College, PA, United States 
Area:
Biomedical Engineering, Radiology

45/81 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2024 Mersch SA, Bergman S, Sheets ED, Boersma AJ, Heikal AA. Two-photon excited-state dynamics of mEGFP-linker-mScarlet-I crowding biosensor in controlled environments. Physical Chemistry Chemical Physics : Pccp. 26: 3927-3940. PMID 38231116 DOI: 10.1039/d3cp04733d  0.754
2021 Kay TM, Aplin CP, Simonet R, Beenken J, Miller RC, Libal C, Boersma AJ, Sheets ED, Heikal AA. Molecular Brightness Approach for FRET Analysis of Donor-Linker-Acceptor Constructs at the Single Molecule Level: A Concept. Frontiers in Molecular Biosciences. 8: 730394. PMID 34595208 DOI: 10.3389/fmolb.2021.730394  0.745
2021 Aplin CP, Miller RC, Kay TM, Heikal AA, Boersma AJ, Sheets ED. Fluorescence Depolarization Dynamics of Ionic Strength Sensors using Time-Resolved Anisotropy. Biophysical Journal. PMID 33582140 DOI: 10.1016/j.bpj.2021.01.035  0.732
2020 Miller RC, Aplin CP, Kay TM, Leighton R, Libal C, Simonet R, Cembran A, Heikal AA, Boersma AJ, Sheets ED. Correction to "FRET Analysis of Ionic Strength Sensors in the Hofmeister Series of Salt Solutions Using Fluorescence Lifetime Measurements". The Journal of Physical Chemistry. B. PMID 32871075 DOI: 10.1021/Acs.Jpcb.0C07220  0.694
2020 Miller RC, Aplin CP, Kay TM, Leighton R, Libal C, Simonet R, Cembran A, Heikal AA, Boersma AJ, Sheets ED. FRET Analysis of Ionic Strength Sensors in the Hofmeister Series of Salt Solutions Using Fluorescence Lifetime Measurements. The Journal of Physical Chemistry. B. PMID 32267692 DOI: 10.1021/Acs.Jpcb.9B10498  0.709
2020 Beenken JA, Tetteh-Jada E, Aplin CP, Kay TM, Boersma AJ, Heikal AA, Sheets ED. Comparative Photophysical Studies of mCerulean3 and mTurquoise2.1 as FRET Donors Biophysical Journal. 118: 44a. DOI: 10.1016/j.bpj.2019.11.423  0.637
2020 Kay TM, Libal C, Aplin CP, Boersma AJ, Sheets ED, Heikal AA. Single-Molecule Studies of Hetero-FRET Biosensors to Environmental Ionic Strength using Different Modalities of Fluorescence Correlation Spectroscopy Biophysical Journal. 118: 615a. DOI: 10.1016/J.Bpj.2019.11.3322  0.729
2020 Aplin CP, Miller RC, Kay TM, Cembran A, Boersma AJ, Heikal AA, Sheets ED. Investigating Novel Hetero-FRET Biosensors for Environmental Ionic Strength using Experimental and Theoretical Approaches Biophysical Journal. 118: 508a. DOI: 10.1016/J.Bpj.2019.11.2798  0.629
2019 Schwarz J, Leopold HJ, Leighton R, Miller RC, Aplin CP, Arnold BJ, Heikal AA, Sheets ED. Macromolecular Crowding Effects on Energy Transfer Efficiency and Donor-Acceptor Distance of Hetero-FRET Sensors using Time-Resolved Fluorescence. Methods and Applications in Fluorescence. PMID 30690439 DOI: 10.1088/2050-6120/ab0242  0.744
2019 Miller RC, Simonet R, Libal C, Aplin C, Cong A, Gurumani M, Kauffman E, Bok Lee H, Boersma AJ, Sheets ED, Heikal AA. FRET at the Single Molecule Level using Molecular Brightness and Fluorescence Correlation Spectroscopy Biophysical Journal. 116: 567a. DOI: 10.1016/J.Bpj.2018.11.3049  0.717
2019 Miller R, Aplin C, Cong A, Libal C, Simonet R, Kauffman E, Gurumani M, Leighton R, Naughton A, Marshik J, Boersma AJ, Heikal AA, Sheets ED. Measuring Ionic Strength Changes using Fluorescence Lifetime and Time-Resolved Anisotropy Biophysical Journal. 116: 472a. DOI: 10.1016/J.Bpj.2018.11.2551  0.726
2018 Leopold H, Leighton R, Schwarz J, Boersma AJ, Sheets ED, Heikal AA. Crowding Effects on Energy Transfer Efficiencies of hetero-FRET Probes as Measured using Time-Resolved Fluorescence Anisotropy. The Journal of Physical Chemistry. B. PMID 30571116 DOI: 10.1021/acs.jpcb.8b09829  0.756
2018 Lee HB, Cong A, Leopold H, Currie M, Boersma AJ, Sheets ED, Heikal AA. Rotational and translational diffusion of size-dependent fluorescent probes in homogeneous and heterogeneous environments. Physical Chemistry Chemical Physics : Pccp. PMID 30204161 DOI: 10.1039/c8cp03873b  0.757
2018 Bok Lee H, Currie M, Leopold H, Sheets ED, Heikal AA. Single Molecule Fluorescence Fluctuation Analysis of Fluorescent Probes in Crowded Environments: Molecular Size and Shape Dependence Biophysical Journal. 114: 682a. DOI: 10.1016/J.Bpj.2017.11.3681  0.743
2018 Leighton RE, Leopold H, Schwarz J, Boersma AJ, Sheets ED, Heikal AA. Modeling the Rotational Dynamics of Novel Hetero-FRET Probes as Measured using Time-Resolved Anisotropy Biophysical Journal. 114: 341a-342a. DOI: 10.1016/j.bpj.2017.11.1907  0.679
2017 Currie M, Leopold H, Schwarz J, Boersma AJ, Sheets ED, Heikal AA. Fluorescence Dynamics of a FRET Probe Designed for Crowding Studies. The Journal of Physical Chemistry. B. PMID 28520430 DOI: 10.1021/acs.jpcb.7b01306  0.745
2017 Schwarz J, Currie M, Leopold H, Boersma AJ, Heikal AA, Sheets ED. Monitoring Macromolecular Crowding via FRET using Wavelength-Dependent Fluorescence Lifetime Measurements Biophysical Journal. 112: 347a. DOI: 10.1016/j.bpj.2016.11.1885  0.737
2017 Leopold H, Currie M, Schwarz J, Boersma AJ, Sheets ED, Heikal AA. Characterization of a Novel FRET Probe in a Crowded Environment using Time-Resolved Anisotropy Biophysical Journal. 112: 346a. DOI: 10.1016/j.bpj.2016.11.1878  0.697
2016 Currie M, Berry B, Ward T, Sheets ED, Heikal AA. Modeling Macromolecular Crowding through Translational and Rotational Diffusion of Small Molecular Probes Biophysical Journal. 110: 50a. DOI: 10.1016/j.bpj.2015.11.335  0.663
2016 Floden T, Warner R, Heikal AA, Sheets ED. Investigating Membrane Domain Dynamics using Multimodal Optical Microscopy Biophysical Journal. 110: 568a. DOI: 10.1016/J.Bpj.2015.11.3040  0.679
2016 Gardeen S, Johnson JL, Heikal A. Fluorescence Micro-Spectroscopy Assessment of the in Vitro Dimerization of BACE1-GFP Fusion Protein in Cultured Cells Biophysical Journal. 110: 319a. DOI: 10.1016/J.Bpj.2015.11.1712  0.724
2015 Currie M, Thao C, Timerman R, Welty R, Berry B, Sheets ED, Heikal AA. Multiscale diffusion of a molecular probe in a crowded environment: A concept Proceedings of Spie - the International Society For Optical Engineering. 9584. DOI: 10.1117/12.2188746  0.728
2015 Warner R, Floden T, Heikal AA, Sheets ED. Molecular and Mechanical Manipulation of Membrane Domains in Planar Supported Bilayers Biophysical Journal. 108: 87a. DOI: 10.1016/j.bpj.2014.11.506  0.613
2014 Heikal A. Natural bioluminescence in living cells for biomedical diagnostics Spie Newsroom. DOI: 10.1117/2.1201410.005615  0.318
2014 Sheets ED, Welty R, Heikal AA. Macromolecular Crowding Effects on the Multiscale Diffusion of Single Molecules Biophysical Journal. 106: 736a. DOI: 10.1016/J.Bpj.2013.11.4057  0.708
2014 Thao C, Timerman R, Welty R, Wickramasinghe D, Heikal A. What Kind of Microviscosity Does a Molecule Experience During its Rotational and Translational Diffusion in Crowded Environments? Biophysical Journal. 106: 736a. DOI: 10.1016/J.Bpj.2013.11.4056  0.461
2014 Alfveby J, Timerman R, Bartusek J, Wickramasinghe D, Israelson H, Heikal A. Two-Photon Fluorescence Lifetime Imaging of Natural Coenzymes in Living Cells as a Function of Oxidative Stress Biophysical Journal. 106: 185a. DOI: 10.1016/J.Bpj.2013.11.1044  0.378
2013 Fransen T, Soto Velasquez M, Welty R, Wickramasinghe D, Heikal A. Experimental and Simulation Analysis of NADH-Enzymes Binding in a Crowded Environment Biophysical Journal. 104: 304a. DOI: 10.1016/J.Bpj.2012.11.1690  0.417
2009 Yu Q, Heikal AA. Two-photon autofluorescence dynamics imaging reveals sensitivity of intracellular NADH concentration and conformation to cell physiology at the single-cell level. Journal of Photochemistry and Photobiology. B, Biology. 95: 46-57. PMID 19179090 DOI: 10.1016/J.Jphotobiol.2008.12.010  0.733
2009 Yu Q, Heikal AA. Noninvasive Approach For Quantitative Analysis Of Energy Metabolism And Mitochondrial Anomalies In Living Cells Biophysical Journal. 96: 240a-241a. DOI: 10.1016/J.Bpj.2008.12.1184  0.749
2008 Yu Q, Proia M, Heikal AA. Integrated biophotonics approach for noninvasive and multiscale studies of biomolecular and cellular biophysics. Journal of Biomedical Optics. 13: 041315. PMID 19021323 DOI: 10.1117/1.2952297  0.787
2008 Davey AM, Krise KM, Sheets ED, Heikal AA. Molecular perspective of antigen-mediated mast cell signaling. The Journal of Biological Chemistry. 283: 7117-27. PMID 18093971 DOI: 10.1074/Jbc.M708879200  0.697
2007 Davey AM, Walvick RP, Liu Y, Heikal AA, Sheets ED. Membrane order and molecular dynamics associated with IgE receptor cross-linking in mast cells. Biophysical Journal. 92: 343-55. PMID 17040981 DOI: 10.1529/Biophysj.106.088815  0.727
2006 Liu Y, Kim HR, Heikal AA. Structural basis of fluorescence fluctuation dynamics of green fluorescent proteins in acidic environments. The Journal of Physical Chemistry. B. 110: 24138-46. PMID 17125385 DOI: 10.1021/jp062164t  0.402
2006 Ariola FS, Mudaliar DJ, Walvick RP, Heikal AA. Dynamics imaging of lipid phases and lipid-marker interactions in model biomembranes. Physical Chemistry Chemical Physics : Pccp. 8: 4517-29. PMID 17047749 DOI: 10.1039/b608629b  0.315
2005 Vishwasrao HD, Heikal AA, Kasischke KA, Webb WW. Conformational dependence of intracellular NADH on metabolic state revealed by associated fluorescence anisotropy. The Journal of Biological Chemistry. 280: 25119-26. PMID 15863500 DOI: 10.1074/Jbc.M502475200  0.37
2004 Korlach J, Baird DW, Heikal AA, Gee KR, Hoffman GR, Webb WW. Spontaneous nucleotide exchange in low molecular weight GTPases by fluorescently labeled gamma-phosphate-linked GTP analogs. Proceedings of the National Academy of Sciences of the United States of America. 101: 2800-5. PMID 14973186 DOI: 10.1073/Pnas.0308579100  0.365
2004 Hess ST, Heikal AA, Webb WW. Fluorescence Photoconversion Kinetics in Novel Green Fluorescent Protein pH Sensors (pHluorins) The Journal of Physical Chemistry B. 108: 10138-10148. DOI: 10.1021/Jp0362077  0.39
2003 Hess ST, Sheets ED, Wagenknecht-Wiesner A, Heikal AA. Quantitative analysis of the fluorescence properties of intrinsically fluorescent proteins in living cells. Biophysical Journal. 85: 2566-80. PMID 14507719 DOI: 10.1016/S0006-3495(03)74679-7  0.753
2002 Hess ST, Huang S, Heikal AA, Webb WW. Biological and chemical applications of fluorescence correlation spectroscopy: a review. Biochemistry. 41: 697-705. PMID 11790090 DOI: 10.1021/Bi0118512  0.327
2002 Heikal AA, Webb WW. Multiphoton fluorescence microscopy in biology Proceedings of Spie - the International Society For Optical Engineering. 4812: 1-14. DOI: 10.1117/12.451382  0.409
2001 Heikal AA, Hess ST, Webb WW. Multiphoton molecular spectroscopy and excited-state dynamics of enhanced green fluorescent protein (EGFP): Acid-base specificity Chemical Physics. 274: 37-55. DOI: 10.1016/S0301-0104(01)00486-4  0.427
2000 Heikal AA, Hess ST, Baird GS, Tsien RY, Webb WW. Molecular spectroscopy and dynamics of intrinsically fluorescent proteins: coral red (dsRed) and yellow (Citrine). Proceedings of the National Academy of Sciences of the United States of America. 97: 11996-2001. PMID 11050231 DOI: 10.1073/Pnas.97.22.11996  0.467
2000 Schwille P, Kummer S, Heikal AA, Moerner WE, Webb WW. Fluorescence correlation spectroscopy reveals fast optical excitation-driven intramolecular dynamics of yellow fluorescent proteins. Proceedings of the National Academy of Sciences of the United States of America. 97: 151-6. PMID 10618386 DOI: 10.1073/Pnas.97.1.151  0.414
1995 Kim SK, Breen JJ, Willberg DM, Peng LW, Heikal A, Syage JA, Zewail AH. Solvation Ultrafast Dynamics of Reactions. 8. Acid-Base Reactions in Finite-Sized Clusters of Naphthol in Ammonia, Water, and Piperidine The Journal of Physical Chemistry. 99: 7421-7435. DOI: 10.1021/J100019A027  0.318
Low-probability matches (unlikely to be authored by this person)
2014 Heikal AA. Time-resolved fluorescence anisotropy and fluctuation correlation analysis of major histocompatibility complex class I proteins in fibroblast cells. Methods (San Diego, Calif.). 66: 283-91. PMID 23811298 DOI: 10.1016/j.ymeth.2013.06.023  0.288
1998 Albota M, Beljonne D, Brédas JL, Ehrlich JE, Fu JY, Heikal AA, Hess SE, Kogej T, Levin MD, Marder SR, McCord-Maughon D, Perry JW, Röckel H, Rumi M, Subramaniam G, et al. Design of organic molecules with large two-photon absorption cross sections. Science (New York, N.Y.). 281: 1653-6. PMID 9733507 DOI: 10.1126/Science.281.5383.1653  0.287
2009 Ariola FS, Li Z, Cornejo C, Bittman R, Heikal AA. Membrane fluidity and lipid order in ternary giant unilamellar vesicles using a new bodipy-cholesterol derivative. Biophysical Journal. 96: 2696-708. PMID 19348752 DOI: 10.1016/J.Bpj.2008.12.3922  0.285
2012 Solntsev PV, Spurgin KL, Sabin JR, Heikal AA, Nemykin VN. Photoinduced charge transfer in short-distance ferrocenylsubphthalocyanine dyads. Inorganic Chemistry. 51: 6537-47. PMID 22651219 DOI: 10.1021/Ic3000608  0.285
2008 Larson DR, Ow H, Vishwasrao HD, Heikal AA, Wiesner U, Webb WW. Silica nanoparticle architecture determines radiative properties of encapsulated fluorophores Chemistry of Materials. 20: 2677-2684. DOI: 10.1021/Cm7026866  0.263
2002 Huang S, Heikal AA, Webb WW. Two-photon fluorescence spectroscopy and microscopy of NAD(P)H and flavoprotein. Biophysical Journal. 82: 2811-25. PMID 11964266 DOI: 10.1016/S0006-3495(02)75621-X  0.259
2011 Wickramasinghe D, Robert Bittman R, Heikal AA. Partitioning and Single-Molecule Diffusion Dynamics of Bodipy-FTY720 in Biomembranes Biophysical Journal. 100: 499a. DOI: 10.1016/j.bpj.2010.12.2924  0.236
1999 Cumpston BH, Ananthavel SP, Barlow S, Dyer DL, Ehrlich JE, Erskine LL, Heikal AA, Kuebler SM, Lee IYS, McCord-Maughon D, Qin J, Röckel H, Rumi M, Wu XL, Marder SR, et al. Two-photon polymerization initiators for three-dimensional optical data storage and microfabrication Nature. 398: 51-54. DOI: 10.1038/17989  0.233
2019 Cong A, Lima Pimenta RM, Mereddy V, Holy JM, Heikal AA. Metabolic-Response Assessment of Murine Breast Cancer Cells in 2D and 3D Cultures using Two-Photon Fluorescence Lifetime Imaging Microscopy of Intrinsic Nad(P)H Biophysical Journal. 116: 421a. DOI: 10.1016/J.Bpj.2018.11.2268  0.23
2006 Shi K, Heikal AA, Liu Z. A single-shot approach for measuring two-photon action cross-section of fluorescent markers. Optics Express. 14: 8722-7. PMID 19529253 DOI: 10.1364/Oe.14.008722  0.223
2013 Welty R, Bentley J, Wickramasinghe D, Heikal AA. Multiscale Diffusion of Single Molecules in Biomimetic Crowding Biophysical Journal. 104: 346a. DOI: 10.1016/j.bpj.2012.11.1921  0.215
2021 Cong ATQ, Pimenta RML, Holy J, Heikal AA. Associated anisotropy of intrinsic NAD(P)H for monitoring changes in the metabolic activities of breast cancer cells (4T1) in three-dimensional collagen matrix. Physical Chemistry Chemical Physics : Pccp. 23: 12692-12705. PMID 34036961 DOI: 10.1039/d0cp06635d  0.203
2009 Porter JJ, Reed R, Fisher T, Heikal AA. Molecular Crowding Effects On Multiscale Diffusion As A Function Of The Hydrodynamic Volume Of Both The Solute And Solvent Molecules Biophysical Journal. 96: 208a. DOI: 10.1016/j.bpj.2008.12.1851  0.198
2015 Xu Z, Gao F, Makarova EA, Heikal AA, Nemykin VN. Energy Transfer from Colloidal Quantum Dots to Near-Infrared-Absorbing Tetraazaporphyrins for Enhanced Light Harvesting The Journal of Physical Chemistry C. 119: 9754-9761. DOI: 10.1021/Acs.Jpcc.5B01603  0.194
1997 Wu X, Heikal AA, Lee IS, Bohorquez M, Perry JW. Photoinduced intermolecular Charge-Transfer Systems for Optical Limiting Mrs Proceedings. 479. DOI: 10.1557/PROC-479-103  0.192
2010 Heikal AA. Intracellular coenzymes as natural biomarkers for metabolic activities and mitochondrial anomalies. Biomarkers in Medicine. 4: 241-63. PMID 20406068 DOI: 10.2217/bmm.10.1  0.184
2000 Rumi M, Ehrlich JE, Heikal AA, Perry JW, Barlow S, Hu Z, McCord-Maughon D, Parker TC, Röckel H, Thayumanavan S, Marder SR, Beljonne D, Brédas JL. Structure - Property relationships for two-photon absorbing chromophores: Bis-donor diphenylpolyene and bis(styryl)benzene derivatives Journal of the American Chemical Society. 122: 9500-9510. DOI: 10.1021/Ja994497S  0.175
1997 Cumpston BH, Mansour K, Heikal AA, Perry JW. Polymer Materials Design for Optical Limiting Mrs Proceedings. 479. DOI: 10.1557/PROC-479-89  0.175
2017 Wilson S, Franklin T, Leighton R, Kajer R, Heikal AA. Elucidating the Macromolecular Crowding Effects on Intracellular NADH and Enzyme Binding using Time-Resolved Associated Anisotropy Biophysical Journal. 112: 288a. DOI: 10.1016/j.bpj.2016.11.1562  0.162
2001 Kuebler SM, Rumi M, Watanabe T, Braun K, Cumpston BH, Heikal AA, Erskine LL, Thayumanavan S, Barlow S, Marder SR, Perry JW. Optimizing Two-Photon Initiators and Exposure Conditions for Three-Dimensional Lithographic Microfabrication. Journal of Photopolymer Science and Technology. 14: 657-668. DOI: 10.2494/Photopolymer.14.657  0.159
2018 Cong A, Pimenta RML, Lee HB, Mereddy V, Holy J, Heikal AA. Two-photon fluorescence lifetime imaging of intrinsic NADH in three-dimensional tumor models. Cytometry. Part a : the Journal of the International Society For Analytical Cytology. PMID 30343512 DOI: 10.1002/cyto.a.23632  0.146
1991 Heikal A, Bañares L, Semmes DH, Zewail AH. Real-time dynamics of vibrational predissociation in anthracene-Arn (n = 1, 2, 3) Chemical Physics. 156: 231-250. DOI: 10.1016/0301-0104(91)80092-V  0.127
2009 Ariola FS, Heikal AA. Examining The Role Of Lipid Variations And Proteins On Membrane Biophysics: Synthetic Versus Natural Membrane Vesicles Biophysical Journal. 96: 548a-549a. DOI: 10.1016/j.bpj.2008.12.2972  0.122
1997 Ehrlich JE, Wu XL, Lee IS, Heikal AA, Hu Z, Röckel H, Marder SR, Perry JW. Two-Photon Absorbing Organic Chromophores for Optical Limiting Mrs Proceedings. 479. DOI: 10.1557/Proc-479-9  0.11
1990 Breen JJ, Peng LW, Willberg DM, Heikal A, Cong P, Zewail AH. Real‐time probing of reactions in clusters The Journal of Chemical Physics. 92: 805-807. DOI: 10.1063/1.458384  0.092
1993 Lienau C, Heikal AA, Zewail AH. Picosecond dynamics of n-hexane solvated trans-stilbene Chemical Physics. 175: 171-191. DOI: 10.1016/0301-0104(93)80236-3  0.083
1992 Banares L, Heikal AA, Zewail AH. Ultrafast dynamics of isomerization reactions: structural effects in stilbene(s) The Journal of Physical Chemistry. 96: 4127-4130. DOI: 10.1021/j100190a001  0.083
2007 Shi K, Heikal AA, Liu Z. Single-shot two-photon action cross section measurement Conference On Quantum Electronics and Laser Science (Qels) - Technical Digest Series. DOI: 10.1109/QELS.2007.4431281  0.081
1997 Heikal AA, Baskin JS, Bañares L, Zewail AH. Structural Effects on the Isomerization Dynamics oftrans-Stilbenes:  IVR, Microcanonical Reaction Rates, and the Nature of the Transition State The Journal of Physical Chemistry A. 101: 572-590. DOI: 10.1021/jp961971x  0.069
2014 Shaker OG, Tawfic SO, El-Tawdy AM, El-Komy MH, El Menyawi M, Heikal AA. Expression of TNF-α, APRIL and BCMA in Behcet's disease. Journal of Immunology Research. 2014: 380405. PMID 25759827 DOI: 10.1155/2014/380405  0.062
1995 Heikal A, Chong S, Baskin J, Zewail A. Microscopic friction and solvation in barrier crossing: isomerization of stilbene in size-selected hexane clusters Chemical Physics Letters. 242: 380-389. DOI: 10.1016/0009-2614(95)00781-X  0.053
2005 Heikal A, Wachowicz K, Fallone B. Sci-YIS Fri - 06: High spatial resolution magnetic resonance spectroscopic imaging of the brain at 3T for external beam radiation therapy planning Medical Physics. 32: 2419-2419. DOI: 10.1118/1.2031028  0.048
2018 Fayed A, El Nokeety MM, Heikal AA, Abdulazim DO, Naguib MM, Sharaf El Din UAA. Fibroblast growth factor-23 is a strong predictor of insulin resistance among chronic kidney disease patients. Renal Failure. 40: 226-230. PMID 29619868 DOI: 10.1080/0886022X.2018.1455594  0.036
2018 Fayed A, El Nokeety MM, Heikal AA, Marzouk K, Hammad H, Abdulazim DO, Salem MM, Sharaf El Din UA. Serum 25-hydroxyvitamin D level is negatively associated with serum phosphorus level among stage 3a-5 chronic kidney disease patients. Nefrologia : Publicacion Oficial De La Sociedad Espanola Nefrologia. PMID 29843900 DOI: 10.1016/j.nefro.2018.02.011  0.033
2019 Fayed A, El Nokeety MM, Heikal AA, Sadek KM, Hammad H, Abdulazim DO, Salem MM, Sharaf El Din UA. Urine albumin and serum uric acid are important determinants of serum 25 hydroxyvitamin D level in pre-dialysis chronic kidney disease patients. Renal Failure. 41: 540-546. PMID 31234687 DOI: 10.1080/0886022X.2018.1563552  0.033
1996 Lund PJ, Heikal A, Maricic MJ, Krupinski EA, Williams CS. Ultrasonographic imaging of the hand and wrist in rheumatoid arthritis. Skeletal Radiology. 24: 591-6. PMID 8614858 DOI: 10.1007/BF00204858  0.013
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