TitleAssociate Professor
InstitutionBaylor College of Medicine
DepartmentDepartment of Medicine
AddressOne Baylor Plaza
Houston, TX 77030
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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Thompson JS, Reddy S, Shaw A, Opekun AR, Kellermayer R. Pediatric Participation in Biobanking Related to Inflammatory Bowel Diseases. Clin Pediatr (Phila). 2024 May 20; 99228241254893. PMID: 38767312.
      Citations:    Fields:    
    2. Patel H, Harris RA, Qian JH, Oezguen N, Watson A, Szigeti RG, Cho S, Ruan W, Britto S, Opekun A, Preidis G, Kellermayer R, Kellermayer R. Genetic Variation Between Small Bowel and Colon-Predominant Crohn's Disease. Cell Mol Gastroenterol Hepatol. 2024; 17(6):1069-1071. PMID: 38369131; PMCID: PMC11127623.
      Citations:    Fields:    
    3. Al Lami Z, Kurtca M, Atique MU, Opekun AR, Siam MS, Jalal PK, Najafi B, Devaraj S, Mindikoglu AL. Dawn-to-dusk dry fasting decreases circulating inflammatory cytokines in subjects with increased body mass index. Metabol Open. 2024 Mar; 21:100274. PMID: 38455231; PMCID: PMC10918425.
    4. Ciocca ET, Staggers KA, Carey J, Opekun AR, Hollinger FB, Keitel WA, Atmar RL, El Sahly HM, Whitaker JA. Delays in Hepatitis A vaccination in people with HIV in Houston, Texas between 2010 and 2018. Vaccine X. 2024 Jan; 16:100422. PMID: 38192618; PMCID: PMC10772366.
    5. Ge Y, Billings WZ, Opekun A, Estes M, Graham D, Leon J, Koelle K, Shen Y, Atmar R, Lopman B, Handel A. Effect of Norovirus Inoculum Dose on Virus Kinetics, Shedding, and Symptoms. Emerg Infect Dis. 2023 07; 29(7):1349-1356. PMID: 37347494; PMCID: PMC10310361.
      Citations: 3     Fields:    Translation:HumansCells
    6. Otley A, Rosh JR, Harris RA, Bush AH, Eagar TN, Qian J, Greenwood MP, Opekun AR, Baldassano R, Guthery SL, Noe JD, Kugathasan S, Kellermayer R. Exome Sequencing Implicates DGKZ , ESRRA , and GXYLT1 for Modulating Granuloma Formation in Crohn Disease. J Pediatr Gastroenterol Nutr. 2023 09 01; 77(3):354-357. PMID: 37347142; PMCID: PMC10528115.
      Citations:    Fields:    Translation:Humans
    7. Shaiken TE, Grimm SL, Siam M, Williams A, Rezaeian AH, Kraushaar D, Ricco E, Robertson MJ, Coarfa C, Jain A, Malovannaya A, Stossi F, Opekun AR, Price AP, Dubrulle J. Transcriptome, proteome, and protein synthesis within the intracellular cytomatrix. iScience. 2023 Feb 17; 26(2):105965. PMID: 36824274; PMCID: PMC9941065.
    8. Mindikoglu AL, Park J, Opekun AR, Abdulsada MM, Wilhelm ZR, Jalal PK, Devaraj S, Jung SY. Dawn-to-dusk dry fasting induces anti-atherosclerotic, anti-inflammatory, and anti-tumorigenic proteome in peripheral blood mononuclear cells in subjects with metabolic syndrome. Metabol Open. 2022 Dec; 16:100214. PMID: 36506940; PMCID: PMC9731888.
      Citations: 1     
    9. Wolfson S, Wilhelm Z, Opekun AR, Orth R, Shulman RJ, Chumpitazi BP. Clinical Characterization of Pediatric Gastroparesis Using a Four-hour Gastric Emptying Scintigraphy Standard. J Pediatr Gastroenterol Nutr. 2021 06 01; 72(6):848-853. PMID: 33605658; PMCID: PMC8486321.
      Citations: 2     Fields:    Translation:Humans
    10. Shaiken TE, Opekun AR. Author Correction: Dissecting the cell to nucleus, perinucleus and cytosol. Sci Rep. 2021 Apr 22; 11(1):9178. PMID: 33888848; PMCID: PMC8062662.
      Citations:    Fields:    
    11. Abdulsada MM, Wilhelm ZR, Opekun AR, Devaraj S, Jalal PK, Mindikoglu AL. The effect of four-week intermittent fasting from dawn to sunset on circulating brain-derived neurotrophic factor levels in subjects with metabolic syndrome and healthy subjects. Metabol Open. 2021 Mar; 9:100070. PMID: 33376976; PMCID: PMC7758552.
      Citations: 1     
    12. Mindikoglu AL, Abdulsada MM, Jain A, Jalal PK, Devaraj S, Wilhelm ZR, Opekun AR, Jung SY. Intermittent fasting from dawn to sunset for four consecutive weeks induces anticancer serum proteome response and improves metabolic syndrome. Sci Rep. 2020 10 27; 10(1):18341. PMID: 33110154; PMCID: PMC7592042.
      Citations: 5     Fields:    Translation:HumansCTClinical Trials
    13. Opekun AR, Zierold C, Rode A, Blocki FA, Fiorini G, Saracino IM, Vaira D, Sutton FM. Clinical Performance of the Automated LIAISON? Meridian H. pylori SA Stool Antigen Test. Biomed Res Int. 2020; 2020:7189519. PMID: 32280698; PMCID: PMC7114771.
      Citations: 4     Fields:    Translation:HumansCells
    14. Opekun AR, Chumpitazi BP, Abdulsada MM, Nichols BL. Routine disaccharidase testing: are we there yet? Curr Opin Gastroenterol. 2020 03; 36(2):101-109. PMID: 31990709; PMCID: PMC7393638.
      Citations:    Fields:    Translation:HumansCells
    15. Mindikoglu AL, Abdulsada MM, Jain A, Choi JM, Jalal PK, Devaraj S, Mezzari MP, Petrosino JF, Opekun AR, Jung SY. Intermittent fasting from dawn to sunset for 30 consecutive days is associated with anticancer proteomic signature and upregulates key regulatory proteins of glucose and lipid metabolism, circadian clock, DNA repair, cytoskeleton remodeling, immune system and cognitive function in healthy subjects. J Proteomics. 2020 04 15; 217:103645. PMID: 31927066; PMCID: PMC7429999.
      Citations: 11     Fields:    Translation:HumansAnimalsCells
    16. Mindikoglu AL, Coarfa C, Opekun AR, Shah VH, Arab JP, Lazaridis KN, Putluri N, Ambati CR, Robertson MJ, Devaraj S, Jalal PK, Rana A, Goss JA, Dowling TC, Weir MR, Seliger SL, Raufman JP, Bernard DW, Vierling JM. Metabolomic biomarkers are associated with mortality in patients with cirrhosis caused by primary biliary cholangitis or primary sclerosing cholangitis. Future Sci OA. 2019 Dec 17; 6(2):FSO441. PMID: 32025330; PMCID: PMC6997913.
    17. Estes MK, Ettayebi K, Tenge VR, Murakami K, Karandikar U, Lin SC, Ayyar BV, Cortes-Penfield NW, Haga K, Neill FH, Opekun AR, Broughman JR, Zeng XL, Blutt SE, Crawford SE, Ramani S, Graham DY, Atmar RL. Human Norovirus Cultivation in Nontransformed Stem Cell-Derived Human Intestinal Enteroid Cultures: Success and Challenges. Viruses. 2019 07 11; 11(7). PMID: 31336765; PMCID: PMC6669637.
      Citations: 24     Fields:    Translation:HumansCells
    18. Graham DY, Ketwaroo GA, Money ME, Opekun AR. Enzyme therapy for functional bowel disease-like post-prandial distress. J Dig Dis. 2018 Nov; 19(11):650-656. PMID: 30101562; PMCID: PMC6910206.
      Citations: 2     Fields:    Translation:Humans
    19. Chumpitazi BP, Robayo-Torres CC, Tsai CM, Opekun AR, Baker SS, Nichols BL, Gilger MA. Demographic and Clinical Correlates of Mucosal Disaccharidase Deficiencies in Children With Functional Dyspepsia. J Pediatr Gastroenterol Nutr. 2018 Jun; 66 Suppl 3:S52-S55. PMID: 29762379; PMCID: PMC5957288.
      Citations: 7     Fields:    Translation:Humans
    20. Robayo-Torres CC, Diaz-Sotomayor M, Hamaker BR, Baker SS, Chumpitazi BP, Opekun AR, Nichols BL. 13C-Labeled-Starch Breath Test in Congenital Sucrase-isomaltase Deficiency. J Pediatr Gastroenterol Nutr. 2018 Jun; 66 Suppl 3:S61-S64. PMID: 29762381; PMCID: PMC5957291.
      Citations: 4     Fields:    Translation:Humans
    21. Opekun AR, Gonzales SA, Al-Saadi MA, Graham DY. Brief report: Lactobacillus bulgaricus GLB44 (Proviotic? ) plus esomeprazole for Helicobacter pylori eradication: A pilot study. Helicobacter. 2018 Apr; 23(2):e12476. PMID: 29504209; PMCID: PMC6913170.
      Citations:    Fields:    Translation:HumansCells
    22. Mindikoglu AL, Opekun AR, Mitch WE, Magder LS, Christenson RH, Dowling TC, Weir MR, Seliger SL, Howell CD, Raufman JP, Rana A, Goss JA, Khaderi SA, Vierling JM. Cystatin C Is a Gender-Neutral Glomerular Filtration Rate Biomarker in Patients with Cirrhosis. Dig Dis Sci. 2018 03; 63(3):665-675. PMID: 29392554; PMCID: PMC5994910.
      Citations: 9     Fields:    Translation:Humans
    23. Cisse F, Erickson DP, Hayes AMR, Opekun AR, Nichols BL, Hamaker BR. Traditional Malian Solid Foods Made from Sorghum and Millet Have Markedly Slower Gastric Emptying than Rice, Potato, or Pasta. Nutrients. 2018 Jan 26; 10(2). PMID: 29373493; PMCID: PMC5852700.
      Citations: 5     Fields:    Translation:HumansAnimalsCTClinical Trials
    24. Mindikoglu AL, Opekun AR, Putluri N, Devaraj S, Sheikh-Hamad D, Vierling JM, Goss JA, Rana A, Sood GK, Jalal PK, Inker LA, Mohney RP, Tighiouart H, Christenson RH, Dowling TC, Weir MR, Seliger SL, Hutson WR, Howell CD, Raufman JP, Magder LS, Coarfa C. Unique metabolomic signature associated with hepatorenal dysfunction and mortality in cirrhosis. Transl Res. 2018 05; 195:25-47. PMID: 29291380; PMCID: PMC6037419.
      Citations: 11     Fields:    Translation:Humans
    25. Mindikoglu AL, Opekun AR, Gagan SK, Devaraj S. Impact of Time-Restricted Feeding and Dawn-to-Sunset Fasting on Circadian Rhythm, Obesity, Metabolic Syndrome, and Nonalcoholic Fatty Liver Disease. Gastroenterol Res Pract. 2017; 2017:3932491. PMID: 29348746; PMCID: PMC5733887.
      Citations: 13     
    26. Avery SE, Quezada-Calvillo R, Kilani SB, Lin AH, Burrin DG, Hodges BE, Chacko SK, Opekun AR, Hindawy ME, Hamaker BR, Oda SI, Nichols BL. Improved Starch Digestion of Sucrase-deficient Shrews Treated With Oral Glucoamylase Enzyme Supplements. J Pediatr Gastroenterol Nutr. 2017 08; 65(2):e35-e42. PMID: 28267073.
      Citations: 1     Fields:    Translation:Animals
    27. Ettayebi K, Crawford SE, Murakami K, Broughman JR, Karandikar U, Tenge VR, Neill FH, Blutt SE, Zeng XL, Qu L, Kou B, Opekun AR, Burrin D, Graham DY, Ramani S, Atmar RL, Estes MK. Replication of human noroviruses in stem cell-derived human enteroids. Science. 2016 09 23; 353(6306):1387-1393. PMID: 27562956; PMCID: PMC5305121.
      Citations: 532     Fields:    Translation:HumansCells
    28. Opekun AR, Balesh AM, Shelby HT. Use of the Biphasic (13)C-Sucrose/Glucose Breath Test to Assess Sucrose Maldigestion in Adults with Functional Bowel Disorders. Biomed Res Int. 2016; 2016:7952891. PMID: 27579322; PMCID: PMC4992795.
      Citations: 7     Fields:    Translation:Humans
    29. Saxena K, Blutt SE, Ettayebi K, Zeng XL, Broughman JR, Crawford SE, Karandikar UC, Sastri NP, Conner ME, Opekun AR, Graham DY, Qureshi W, Sherman V, Foulke-Abel J, In J, Kovbasnjuk O, Zachos NC, Donowitz M, Estes MK. Human Intestinal Enteroids: a New Model To Study Human Rotavirus Infection, Host Restriction, and Pathophysiology. J Virol. 2016 01 01; 90(1):43-56. PMID: 26446608; PMCID: PMC4702582.
      Citations: 177     Fields:    Translation:HumansCells
    30. Atmar RL, Bernstein DI, Lyon GM, Treanor JJ, Al-Ibrahim MS, Graham DY, Jiang X, Gregoricus N, Frenck RW, Moe CL, Chen WH, Ferreira J, Barrett J, Opekun AR, Estes MK, Borkowski A, Baehner F, Goodwin R, Edmonds A, Mendelman PM, Vinj? J. Serological Correlates of Protection against a GII.4 Norovirus. Clin Vaccine Immunol. 2015 Aug; 22(8):923-9. PMID: 26041041; PMCID: PMC4519714.
      Citations: 55     Fields:    Translation:HumansCellsCTClinical Trials
    31. Schaefer JS, Attumi T, Opekun AR, Abraham B, Hou J, Shelby H, Graham DY, Streckfus C, Klein JR. MicroRNA signatures differentiate Crohn's disease from ulcerative colitis. BMC Immunol. 2015 Feb 10; 16:5. PMID: 25886994; PMCID: PMC4335694.
      Citations: 68     Fields:    Translation:HumansCells
    32. Ramani S, Neill FH, Opekun AR, Gilger MA, Graham DY, Estes MK, Atmar RL. Mucosal and Cellular Immune Responses to Norwalk Virus. J Infect Dis. 2015 Aug 01; 212(3):397-405. PMID: 25635121; PMCID: PMC4817641.
      Citations: 50     Fields:    Translation:HumansCells
    33. Atmar RL, Opekun AR, Gilger MA, Graham DY, Estes MK, Czak? R. Experimental human infection with Norwalk virus elicits a surrogate neutralizing antibody response with cross-genogroup activity. Clin Vaccine Immunol. 2015 Feb; 22(2):221-8. PMID: 25540269; PMCID: PMC4308873.
      Citations: 18     Fields:    Translation:HumansCells
    34. Atmar RL, Opekun AR, Estes MK, Graham DY. Reply to Kirby et al. J Infect Dis. 2015 Jan 01; 211(1):167. PMID: 25015947; PMCID: PMC4859318.
      Citations:    Fields:    Translation:HumansCells
    35. Harris RA, Nagy-Szakal D, Mir SA, Frank E, Szigeti R, Kaplan JL, Bronsky J, Opekun A, Ferry GD, Winter H, Kellermayer R. DNA methylation-associated colonic mucosal immune and defense responses in treatment-na?ve pediatric ulcerative colitis. Epigenetics. 2014 Aug; 9(8):1131-7. PMID: 24937444; PMCID: PMC4164498.
      Citations: 34     Fields:    Translation:HumansCells
    36. Shaiken TE, Opekun AR. Dissecting the cell to nucleus, perinucleus and cytosol. Sci Rep. 2014 May 12; 4:4923. PMID: 24815916; PMCID: PMC4017230.
      Citations: 27     Fields:    Translation:HumansCells
    37. Hergenroeder GW, Ward NH, Yu X, Opekun A, Moore AN, Kozinetz CA, Powner DJ. Randomized trial to evaluate nutritional status and absorption of enteral feeding after brain death. Prog Transplant. 2013 Dec; 23(4):374-82. PMID: 24311403; PMCID: PMC3971639.
      Citations: 2     Fields:    Translation:Humans
    38. Atmar RL, Opekun AR, Gilger MA, Estes MK, Crawford SE, Neill FH, Ramani S, Hill H, Ferreira J, Graham DY. Determination of the 50% human infectious dose for Norwalk virus. J Infect Dis. 2014 Apr 01; 209(7):1016-22. PMID: 24253285; PMCID: PMC3952671.
      Citations: 110     Fields:    Translation:HumansCells
    39. Chumpitazi BP, Robayo-Torres CC, Opekun AR, Nichols BL, Naim HY. Congenital sucrase-isomaltase deficiency: summary of an evaluation in one family. J Pediatr Gastroenterol Nutr. 2012 Nov; 55 Suppl 2:S36. PMID: 23103651; PMCID: PMC4277877.
      Citations: 5     Fields:    Translation:Humans
    40. Robayo-Torres CC, Baker SS, Chumpitazi BP, Lecea CE, Nichols BL, Opekun AR. Poor starch digestion in children with CSID and recurrent abdominal pain. J Pediatr Gastroenterol Nutr. 2012 Nov; 55 Suppl 2:S32-4. PMID: 23103649.
      Citations: 2     Fields:    Translation:Humans
    41. Gilger M, Hamaker B, Nichols BL, Auricchio S, Treem WR, Naim HY, Heine M, Zimmer KP, Jones K, Eskandari R, Pinto BM, Rose DR, Lee BH, Quezada-Calvillo R, Adams B, Roach CM, Ma CX, Baker SS, Slawson MH, Robayo-Torres CC, Chumpitazi BP, Lecea CE, Opekun AR, Uhrich S, Wu Z, Huang JY, Scott CR, McMeans AR, Scholz D, Shulman RJ, Ao Z, Sterchi EE, Lin AH. Research progress reported at the 50th Anniversary of the Discovery of Congenital Sucrase-Isomaltase Deficiency Workshop. J Pediatr Gastroenterol Nutr. 2012 Nov; 55 Suppl 2:S1. PMID: 23103641; PMCID: PMC4413904.
      Citations:    Fields:    Translation:Humans
    42. Ajami NJ, Barry MA, Carrillo B, Muhaxhiri Z, Neill FH, Prasad BV, Opekun AR, Gilger MA, Graham DY, Atmar RL, Estes MK. Antibody responses to norovirus genogroup GI.1 and GII.4 proteases in volunteers administered Norwalk virus. Clin Vaccine Immunol. 2012 Dec; 19(12):1980-3. PMID: 23035177; PMCID: PMC3535860.
      Citations: 10     Fields:    Translation:HumansCells
    43. Harris RA, Nagy-Szakal D, Pedersen N, Opekun A, Bronsky J, Munkholm P, Jespersgaard C, Andersen P, Melegh B, Ferry G, Jess T, Kellermayer R. Genome-wide peripheral blood leukocyte DNA methylation microarrays identified a single association with inflammatory bowel diseases. Inflamm Bowel Dis. 2012 Dec; 18(12):2334-41. PMID: 22467598; PMCID: PMC3812910.
      Citations: 48     Fields:    Translation:HumansCells
    44. Atmar RL, Opekun AR, Gilger MA, Graham DY, Estes MK, Czak? R. Serum hemagglutination inhibition activity correlates with protection from gastroenteritis in persons infected with Norwalk virus. Clin Vaccine Immunol. 2012 Feb; 19(2):284-7. PMID: 22190401; PMCID: PMC3272916.
      Citations: 32     Fields:    Translation:HumansCells
    45. Atmar RL, Bernstein DI, Harro CD, Al-Ibrahim MS, Chen WH, Ferreira J, Estes MK, Graham DY, Opekun AR, Richardson C, Mendelman PM. Norovirus vaccine against experimental human Norwalk Virus illness. N Engl J Med. 2011 Dec 08; 365(23):2178-87. PMID: 22150036; PMCID: PMC3761795.
      Citations: 219     Fields:    Translation:HumansCells
    46. Kavanagh O, Estes MK, Reeck A, Raju RM, Opekun AR, Gilger MA, Graham DY, Atmar RL. Serological responses to experimental Norwalk virus infection measured using a quantitative duplex time-resolved fluorescence immunoassay. Clin Vaccine Immunol. 2011 Jul; 18(7):1187-90. PMID: 21593238; PMCID: PMC3147314.
      Citations: 14     Fields:    Translation:HumansCells
    47. Reeck A, Kavanagh O, Estes MK, Opekun AR, Gilger MA, Graham DY, Atmar RL. Serological correlate of protection against norovirus-induced gastroenteritis. J Infect Dis. 2010 Oct 15; 202(8):1212-8. PMID: 20815703; PMCID: PMC2945238.
      Citations: 137     Fields:    Translation:HumansCellsCTClinical Trials
    48. Graham DY, Javed SU, Keihanian S, Abudayyeh S, Opekun AR. Dual proton pump inhibitor plus amoxicillin as an empiric anti-H. pylori therapy: studies from the United States. J Gastroenterol. 2010 Aug; 45(8):816-20. PMID: 20195646.
      Citations: 17     Fields:    Translation:HumansCellsCTClinical Trials
    49. Malaty HM, Fan X, Opekun AR, Thibodeaux C, Ferry GD. Rising incidence of inflammatory bowel disease among children: a 12-year study. J Pediatr Gastroenterol Nutr. 2010 Jan; 50(1):27-31. PMID: 19934770.
      Citations: 66     Fields:    Translation:Humans
    50. Wu DC, Hsu PI, Wu JY, Opekun AR, Kuo CH, Wu IC, Wang SS, Chen A, Hung WC, Graham DY. Sequential and concomitant therapy with four drugs is equally effective for eradication of H pylori infection. Clin Gastroenterol Hepatol. 2010 Jan; 8(1):36-41.e1. PMID: 19804842; PMCID: PMC2838430.
      Citations: 81     Fields:    Translation:HumansCells
    51. Elitsur Y, Tolia V, Gilger MA, Reeves-Garcia J, Schmidt-Sommerfeld E, Opekun AR, El-Zimaity H, Graham DY, Enmei K. Urea breath test in children: the United States prospective, multicenter study. Helicobacter. 2009 Apr; 14(2):134-40. PMID: 19298341.
      Citations: 12     Fields:    Translation:HumansCells
    52. Robayo-Torres CC, Opekun AR, Quezada-Calvillo R, Villa X, Smith EO, Navarrete M, Baker SS, Nichols BL. 13C-breath tests for sucrose digestion in congenital sucrase isomaltase-deficient and sacrosidase-supplemented patients. J Pediatr Gastroenterol Nutr. 2009 Apr; 48(4):412-8. PMID: 19330928; PMCID: PMC3955999.
      Citations: 13     Fields:    Translation:Humans
    53. Atmar RL, Opekun AR, Gilger MA, Estes MK, Crawford SE, Neill FH, Graham DY. Norwalk virus shedding after experimental human infection. Emerg Infect Dis. 2008 Oct; 14(10):1553-7. PMID: 18826818; PMCID: PMC2609865.
      Citations: 252     Fields:    Translation:HumansCells
    54. Robayo-Torres CC, Opekun AR, Sen P, Ao Z, Hamaker BR, Quaroni A, Brayer GD, Wattler S, Nehls MC, Sterchi EE, Nichols BL, Quezada-Calvillo R. Contribution of mucosal maltase-glucoamylase activities to mouse small intestinal starch alpha-glucogenesis. J Nutr. 2007 Jul; 137(7):1725-33. PMID: 17585022.
      Citations: 16     Fields:    Translation:Animals
    55. Shiotani A, Opekun AR, Graham DY. Visualization of the small intestine using capsule endoscopy in healthy subjects. Dig Dis Sci. 2007 Apr; 52(4):1019-25. PMID: 17380402.
      Citations: 16     Fields:    Translation:Humans
    56. Brunetti-Pierri N, Opekun AR, Craigen WJ. Two familial cases of high blood galactose of unknown aetiology. J Inherit Metab Dis. 2006 Dec; 29(6):762. PMID: 16988899.
      Citations:    Fields:    Translation:HumansCells
    57. Opekun AR, Luu P, Gotschall AB, Abdalla N, Torres E, Rudd SB, Graham DY, Nurgalieva ZZ, Tsuchiya K. Point-of-care Helicobacter pylori urine antibody detection in a multi-ethnic adult population in the United States. Transl Res. 2006 Jul; 148(1):13-8. PMID: 16887493.
      Citations: 3     Fields:    Translation:HumansCells
    58. Nurgalieva ZZ, Nugalieva ZZ, Opekun AR, Graham DY. Problem of distinguishing false-positive tests from acute or transient Helicobacter pylori infections. Helicobacter. 2006 Apr; 11(2):69-74. PMID: 16579835.
      Citations: 9     Fields:    Translation:HumansCells
    59. Graham DY, Nurgalieva ZZ, El-Zimaity HM, Opekun AR, Campos A, Guerrero L, Chavez A, Cardenas V. Noninvasive versus histologic detection of gastric atrophy in a Hispanic population in North America. Clin Gastroenterol Hepatol. 2006 Mar; 4(3):306-14. PMID: 16527693.
      Citations: 27     Fields:    Translation:HumansCells
    60. Opekun AR, Gotschall AB, Abdalla N, Agent C, Torres E, Sutton FM, Graham DY, Tsuchiya K. Improved infrared spectrophotometer for point-of-care patient 13C-urea breath testing in the primary care setting. Clin Biochem. 2005 Aug; 38(8):731-4. PMID: 15963485.
      Citations: 5     Fields:    Translation:HumansCells
    61. Nurgalieva ZZ, Conner ME, Opekun AR, Zheng CQ, Elliott SN, Ernst PB, Osato M, Estes MK, Graham DY. B-cell and T-cell immune responses to experimental Helicobacter pylori infection in humans. Infect Immun. 2005 May; 73(5):2999-3006. PMID: 15845507; PMCID: PMC1087341.
      Citations: 21     Fields:    Translation:HumansCells
    62. Shahidzadeh R, Opekun A, Shiotani A, Graham DY. Effect of the carbonic anhydrase inhibitor, acetazolamide, on Helicobacter pylori infection in vivo: a pilot study. Helicobacter. 2005 Apr; 10(2):136-8. PMID: 15810944.
      Citations: 7     Fields:    Translation:HumansCTClinical Trials
    63. Graham DY, Kudo M, Reddy R, Opekun AR. Practical rapid, minimally invasive, reliable nonendoscopic method to obtain Helicobacter pylori for culture. Helicobacter. 2005 Feb; 10(1):1-3. PMID: 15691309.
      Citations: 9     Fields:    Translation:HumansCells
    64. Graham DY, Opekun AR, Willingham FF, Qureshi WA. Visible small-intestinal mucosal injury in chronic NSAID users. Clin Gastroenterol Hepatol. 2005 Jan; 3(1):55-9. PMID: 15645405.
      Citations: 173     Fields:    Translation:Humans
    65. Nanavati SA, Opekun AR, Hacken-Bitar JB, Cole RA, Anand BS, Graham DY. Migrating shell fragment as a cause of recurrent obscure gastrointestinal bleeding. J Clin Gastroenterol. 2004 Feb; 38(2):137-8. PMID: 14745292.
      Citations:    Fields:    Translation:Humans
    66. Graham DY, Opekun AR, Jogi M, Yamaoka Y, Lu H, Reddy R, El-Zimaity HM. False negative urea breath tests with H2-receptor antagonists: interactions between Helicobacter pylori density and pH. Helicobacter. 2004 Feb; 9(1):17-27. PMID: 15156900.
      Citations: 11     Fields:    Translation:HumansCells
    67. Graham DY, Opekun AR, Hammoud F, Yamaoka Y, Reddy R, Osato MS, El-Zimaity HM. Studies regarding the mechanism of false negative urea breath tests with proton pump inhibitors. Am J Gastroenterol. 2003 May; 98(5):1005-9. PMID: 12809820.
      Citations: 40     Fields:    Translation:HumansCells
    68. Willingham FF, Opekun AR, Graham DY. Endoscopic demonstration of transient small bowel intussusception in a patient with adult celiac disease. Gastrointest Endosc. 2003 Apr; 57(4):626-7. PMID: 12665791.
      Citations: 4     Fields:    Translation:Humans
    69. Opekun AR, Abdalla N, Sutton FM, Hammoud F, Kuo GM, Torres E, Steinbauer J, Graham DY. Urea breath testing and analysis in the primary care office. J Fam Pract. 2002 Dec; 51(12):1030-2. PMID: 12540328.
      Citations: 3     Fields:    Translation:HumansCells
    70. Morrisett JD, Abdel-Fattah G, Hoogeveen R, Mitchell E, Ballantyne CM, Pownall HJ, Opekun AR, Jaffe JS, Oppermann S, Kahan BD. Effects of sirolimus on plasma lipids, lipoprotein levels, and fatty acid metabolism in renal transplant patients. J Lipid Res. 2002 Aug; 43(8):1170-80. PMID: 12177161.
      Citations: 93     Fields:    Translation:Humans
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