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Babaei Zarch M, Bazargan M, Mirzaei M. Selective Hydrolysis of Ovalbumin by Zr-Based Lacunary Polyoxotungstate in Surfactant Solutions. Inorg Chem 2024; 63:6141-6151. [PMID: 38530420 DOI: 10.1021/acs.inorgchem.3c03411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
This study aims to design an artificial metalloprotease based on a Zr-containing polyoxometalate Na8[Zr(W5O18)2] [Zr(W5)2] for the hydrolysis of ovalbumin (OVA) in the presence of different surfactants, which can be used in many areas of the biological and medical sciences, particularly for targeted proteolytic drug design. For this reason, parameters, including the free energy of binding, the chemical nature of amino acid residues, secondary structures, and electrostatic potentials, of Zr(W5)2-OVA and Zr(W5)2-OVA-surfactant were analyzed by molecular docking simulations. The investigations showed that the presence of surfactants decreases the binding affinity of Zr(W5)2 for OVA amino acids, and hydrogen bonds and van der Waals interactions are formed between Zr(W5)2 and OVA amino acids. Additionally, GROMACS further illustrated the significance of SDS and CTAB surfactants in influencing the conformational changes of the OVA that lead to selective protein hydrolysis. In agreement with molecular dynamics simulation results, the experimental analysis showed more protein hydrolysis for the Zr(W5)2-OVA-surfactant systems. For instance, circular dichroism spectroscopy indicated that Zr(W5)2-OVA-CTAB and Zr(W5)2-OVA-TX-100 were more hydrolytically efficient due to the increased level of β-structures rather than α-chains, which showed that surfactants can facilitate the accessibility of Zr(W5)2 to the cleavage sites by inducing partial unfolding of the OVA structure.
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Affiliation(s)
- Malihe Babaei Zarch
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
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Bazargan M, Comini J, Kibe LW, Assari S, Cobb S. Association between Migraine and Quality of Life, Mental Health, Sleeping Disorders, and Health Care Utilization Among Older African American Adults. J Racial Ethn Health Disparities 2023:10.1007/s40615-023-01629-y. [PMID: 37227684 DOI: 10.1007/s40615-023-01629-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/28/2023] [Accepted: 04/30/2023] [Indexed: 05/26/2023]
Abstract
PURPOSE This study examines the associations between migraine headaches, well-being, and health care use among a sample of underserved older African American adults. Controlling for relevant variables, the association between migraine headaches and (1) health care utilization, (2) health-related quality of life (HRQoL), and (3) physical and mental health outcomes was examined. METHODS Our sample included 760 older African American adults from South Los Angeles recruited through convenience and snowball sampling. In addition to demographic variables, our survey included validated instruments, such as the SF-12 QoL, Short-Form McGill Pain Questionnaire, and the Geriatric Depression Scale. Data analysis included 12 independent multivariate models using multiple linear regression, log transferred linear regression, binary and multinomial logistic regression, and generalized linear regression with Poisson distribution. RESULTS Having migraine was associated with three categories of outcomes: (1) higher level of health care utilization measured by (i) emergency department admissions and (ii) number of medication use; (2) lower level of HRQoL and health status measured by (i) lower self-rated health (ii) physical QoL, and (iii) mental QoL; and (3) worse physical and mental health outcomes measured by (i) higher number of depressive symptoms, (ii) higher level of pain, (iii) sleep disorder, and (iv) being disabled. CONCLUSIONS Migraine headache significantly was associated with quality of life, health care utilization, and many health outcomes of underserved African American middle-aged and older adults. Diagnoses and treatments of migraine among underserved older African American adults require multi-faceted and culturally sensitive interventional studies.
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Affiliation(s)
- M Bazargan
- Department of Family Medicine, Charles R. Drew University of Medicine and Science (CDU), Los Angeles, CA, USA.
- Department of Family Medicine, David Geffen School of Medicine UCLA, Los Angeles, CA, USA.
- Department of Urban Public Health, CDU, Los Angeles, CA, USA.
- Physician Assistant Program, CDU, Los Angeles, CA, USA.
| | - J Comini
- Physician Assistant Program, CDU, Los Angeles, CA, USA
| | - L W Kibe
- Physician Assistant Program, CDU, Los Angeles, CA, USA
| | - S Assari
- Department of Family Medicine, Charles R. Drew University of Medicine and Science (CDU), Los Angeles, CA, USA
- Department of Family Medicine, David Geffen School of Medicine UCLA, Los Angeles, CA, USA
| | - S Cobb
- Mervyn M. Dymally College of Nursing, CDU, Los Angeles, CA, USA
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Bazargan M, Mirzaei M, Amiri A, Mague JT. Opioid Drug Detection in Hair Samples Using Polyoxometalate-Based Frameworks. Inorg Chem 2023; 62:56-65. [PMID: 36576501 DOI: 10.1021/acs.inorgchem.2c02658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A series of two-dimensional (2D) polyoxometalate-based frameworks, [Ln3(PDA)3(H2O)6(PMo12O40)]·xH2O (Ln = La (1); Ce (2); Pr (3); Nd (4); PDA = 1,10-phenanthroline-2,9-dicarboxylate), have been synthesized and structurally characterized by various analytical techniques. Single-crystal X-ray diffraction reveals that 1-4 have a unique 2D layer structure in which Keggin anions have coordinated upward and downward the plane, and this feature makes them suitable candidates for surface binding of common drugs via supramolecular and electrostatic interactions. Also, the ability of 1-4 (as the first polyoxomolybdate-containing frameworks) as sorbents for the extraction and quantitative determination of opioid drugs (morphine, methadone, and pethidine) was investigated by using dispersive micro-solid-phase extraction (D-μSPE) and high-performance liquid chromatography (HPLC). The method showed wide linear ranges in the range of 0.3 to 300 ng mg-1 and low limits of detection (LODs) ranged from 0.1 to 0.2 ng mg-1 of hair.
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Affiliation(s)
- Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.,Khorasan Science and Technology Park (KSTP), 12th km of Mashhad-Quchan Road, Mashhad, Khorasan Razavi 9185173911, Iran
| | - Amirhassan Amiri
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Joel T Mague
- Department of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
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Bazargan M, Mirzaei M, Hamid AS, Kafshdar ZH, Ziaekhodadadian H, Momenzadeh E, Mague JT, Gil DM, Gomila RM, Frontera A. On the importance of π-stacking interactions in the complexes of copper and zinc bearing pyridine-2,6-dicarboxylic acid N-oxide and N-donor auxiliary ligands. CrystEngComm 2022. [DOI: 10.1039/d2ce00656a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Using N- and O-donor ligands in a mixed-ligand system, three new coordination complexes have been X-ray characterized, exhibiting strong π–π stacking interactions.
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Affiliation(s)
- Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Abdul Samad Hamid
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | | | - Hoda Ziaekhodadadian
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Elham Momenzadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran
| | - Joel T. Mague
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
| | - Diego M. Gil
- INBIOFAL (CONICET – UNT), Instituto de Química Orgánica, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI, San Miguel de Tucumán, Argentina
| | - Rosa M. Gomila
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, SPAIN
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, SPAIN
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Alizadeh H, Mirzaei M, Saljooghi AS, Jodaian V, Bazargan M, Mague JT, Gomila RM, Frontera A. Coordination complexes of zinc and manganese based on pyridine-2,5-dicarboxylic acid N-oxide: DFT studies and antiproliferative activities consideration. RSC Adv 2021; 11:37403-37412. [PMID: 35496427 PMCID: PMC9043818 DOI: 10.1039/d1ra08258b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 11/15/2021] [Indexed: 12/13/2022] Open
Abstract
We report here the design, synthesis, and antiproliferative activity of three coordination complexes [Mn2(pydco)2(bpy)2(H2O)2]·2H2O (1), [Zn(bpy)(Hpydco)2] (2), and [Zn(bpy)Cl(Hpydco)]·2H2O (3) (H2pydco = pyridine-2,5-dicarboxylic acid N-oxide, bpy = 2,2'-bipyridine). Molecular structures of these complexes have been characterized by elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and powder and single-crystal X-ray diffraction. According to the structural analysis, 1-3 are discrete complexes containing N- and O-donor ligands (bpy and pydco2-) in which pydco2- can be coordinated to the metal centres via the N-oxide oxygen and one carboxylate oxygen to generate a six-membered chelate ring. Also, these structures benefit from extensive intermolecular interactions such as hydrogen bonds and π-interactions which are the major forces to make them more stable in the solid state. The energetic features of the π-stacking interactions observed in compounds 1-3 have been computed and compared to the H-bonds. The interactions in the solid state have been also studied using the independent gradient model approach (IGM plot). The IGM-δg approach uses a new descriptor (δg) that locally represents the difference between a virtual upper limit of the electron density gradient and the true electron density gradient. This newly developed IGM methodology automatically extracts the signature of interactions between two given fragments. Finally, the antiproliferative properties of these complexes were tested on several cancer cell lines by MTT assay and flow cytometry. Also, to compare the antiproliferative activities of these complexes with common chemotherapy drugs, the antiproliferative property of cisplatin was evaluated as a reference and positive control.
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Affiliation(s)
- Hanie Alizadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad Mashhad 9177948974 Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad Mashhad 9177948974 Iran
| | - Amir Sh Saljooghi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad Mashhad 9177948974 Iran
| | - Vida Jodaian
- Department of Chemistry, Islamshahr Branch, Islamic Azad University Islamshahr 3317843154 Iran
| | - Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad Mashhad 9177948974 Iran
| | - Joel T Mague
- Department of Chemistry, Tulane University New Orleans LA 70118 USA
| | - Rosa M Gomila
- Departament de Química, Universitat de les Illes Balears Crta de Valldemossa km 7.5 07122 Palma de Mallorca (Baleares) SPAIN
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears Crta de Valldemossa km 7.5 07122 Palma de Mallorca (Baleares) SPAIN
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Babaei Zarch M, Mirzaei M, Bazargan M, Gupta SK, Meyer F, Mague JT. Single-molecule magnets within polyoxometalate-based frameworks. Dalton Trans 2021; 50:15047-15056. [PMID: 34610055 DOI: 10.1039/d1dt01708j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As an extension of our interest in polyoxometalates (POMs) and lanthanoids, we report the design and synthesis of two polyoxometalate-based frameworks under hydrothermal conditions; [Ho4(PDA)4(H2O)11][(SiO4)@W12O36]·8H2O (1) and [Tb4(PDA)4(H2O)12][(SiO4)@W12O36]·4H2O (2) (H2PDA = 1,10-phenanthroline-2,9-dicarboxylic acid). Both hybrids have been characterized by elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and powder/single-crystal X-ray diffraction. According to the structural analysis, 1 and 2 consist of 2D-cationic coordination polymers based on the respective lanthanoids and PDA2- as well as Keggin anions that reside in the interspaces between two adjacent layers as discrete counterions connected by extensive hydrogen bonding. Although the overall structures of 1 and 2 are composed of cationic and anionic layers, there are many differences in the cationic layers such as various coordination modes of PDA2-, different void shapes, and the existence of dinuclear Tb(III) units only in 2. Frameworks 1 and 2 were further characterized by dc and ac magnetic measurements and both exhibit slow relaxation of magnetization at low temperatures under an applied dc field. Their single-molecule magnet (SMM) properties are investigated, where weak field-induced SMM behaviour is observed at low temperatures in dynamic magnetic studies.
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Affiliation(s)
- Malihe Babaei Zarch
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
| | - Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
| | - Sandeep K Gupta
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Joel T Mague
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
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Haj Hashemi F, Atashzadeh‐Shoorideh F, Oujian P, Mofid B, Bazargan M. Relationship between perceived social support and psychological hardiness with family communication patterns and quality of life of oncology patients. Nurs Open 2021; 8:1704-1711. [PMID: 33606919 PMCID: PMC8186685 DOI: 10.1002/nop2.808] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 12/30/2020] [Accepted: 01/31/2021] [Indexed: 12/16/2022] Open
Abstract
AIM The purpose of this study was to determine the relationship between PSS, PH, FCP and QoL of oncology patients. METHODS In this descriptive-correlational study, 340 oncology patients were selected with convenience sampling method from the hospitals in Tehran 2018-2019. Data were collected using, "PSS," "PH," "FCP" and "European Organization for Research and Treatment of Cancer Quality of Life Questionnaire, EORTC QLQ-C30." Data were analysed using descriptive and inferential statistics using SPSS21 and Amos. RESULTS The direct effect and the total effect of PSS and FCP on QoL were significant (p < .001), but their indirect effect was not significant (p > .05) and the effect of PH on QoL was not significant (p = .96). The Root Mean Squares of Error Approximations (RMSEA), Non-Normed Fit Index (NNFI), Comparative Fit Index (CFI) and Goodness of Fit Index (GFI) were estimated 0.07, 0.97, 0.98 and 0.91, respectively.
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Affiliation(s)
- Fatemeh Haj Hashemi
- Student Research Committee, School of Nursing & MidwiferyShahid Beheshti University of Medical SciencesTehranIran
| | - Foroozan Atashzadeh‐Shoorideh
- Department of Psychiatric Nursing and ManagementSchool of Nursing & MidwiferyShahid Beheshti University of Medical SciencesTehranIran
| | - Parastoo Oujian
- Department of Pediatric NursingSchool of Nursing & MidwiferyShahid Beheshti University of Medical SciencesTehranIran
| | - Bahram Mofid
- Cancer Research CenterDepartment of Radiation OncologyShohada‐e‐Tajrish Medical CenterSchool of MedicineShahid Beheshti University of Medical SciencesTehranIran
| | - Maryam Bazargan
- College of Nursing and Health SciencesFlinders UniversityAdelaideSAAustralia
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Bazargan M, Mirzaei M, Amiri A, Ritchie C. Efficient dispersive micro solid-phase extraction of antidepressant drugs by a robust molybdenum-based coordination polymer. Mikrochim Acta 2021; 188:108. [PMID: 33660036 DOI: 10.1007/s00604-021-04767-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 02/18/2021] [Indexed: 01/09/2023]
Abstract
A molybdenum-based coordination polymer {[Mo(PDA)(NO)(μ-O)MoO3]·1.42H2O·0.58C2H5OH}n (1) (PDA is 1,10-phenanthroline-2,9-dicarboxylate) was synthesized using solvothermal reaction conditions and characterized using a suite of analytical techniques. Single-crystal X-ray diffraction studies reveal a 1D chain structure, with close contacts expanding the structure into 3D including π-interactions and hydrogen bonding. The utility of 1 as a sorbent for dispersive micro solid-phase extraction (D-μSPE) of basic organic compounds such as antidepressants is supported by the presence of many functional groups on the surface of 1 (such as pendant carboxylates, Mo=O, Mo-NO, and CH groups) as well as extensive electrostatic interactions. Therefore, 1 can be a suitable choice as sorbent in the D-μSPE of antidepressant drugs from human plasma samples via appreciable adsorbate-adsorbent interactions. Determination of the extracted antidepressant drugs was conducted using high-performance liquid chromatography-ultraviolet (HPLC-UV), with calibration plots being linear in the concentration range 0.1-500 ng mL-1 for amitriptyline and nortriptyline, 0.2-500 ng mL-1 for imipramine, and 0.5-300 ng mL-1 for sertraline. The relative standard deviation (RSD) values were calculated for both intra-day and inter-day precision, and the RSD% values were in the range 3.9 to 5.2% and 4.6-5.4%, respectively. The limits of detection (LODs) was determined as 0.03-0.2 ng mL-1. Due to the good stability and reusability of the sorbent, the adsorption capacity had no obvious decrease after being used 20 times. Finally, the D-μSPE-HPLC-UV method was applied for the determination of antidepressant drugs in human plasma samples with recoveries of the analytes in the range 94.9 to 102%. The article describes the synthesis of a robust molybdenum-based coordination polymer, and its application as sorbent for dispersive micro solid-phase extraction of antidepressant drugs from human plasma samples.
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Affiliation(s)
- Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.
| | - Amirhassan Amiri
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, Sabzevar, 96179-76487, Iran.
| | - Chris Ritchie
- School of Chemistry, Monash University, Clayton, Victoria, 3800, Australia
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Mirzaei M, Bazargan M, Ebtehaj P, Mague JT. A redetermination of the structure and Hirshfeld surface analysis of poly[di-aquadi-μ-hydroxido-tetra-kis-(μ-nicotinato N-oxide)tricopper(II)]. Acta Crystallogr E Crystallogr Commun 2021; 77:309-313. [PMID: 33953957 PMCID: PMC8061101 DOI: 10.1107/s2056989021002000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 02/19/2021] [Indexed: 11/17/2022]
Abstract
The product obtained from the reaction of pyridine-2,3-di-carb-oxy-lic acid and hydrated copper(II) chloride in hot aqueous NaOH solution was determined by low temperature X-ray diffraction to be [Cu3(C6H4NO3)4(OH)2(H2O)2] n or [Cu3(μ-OH)2(μ-nicNO)4(H2O)2] n (nicNO is pyridine-3-carboxyl-ate N-oxide), a structure obtained from room temperature data and reported previously. The present determination is improved in quality and treatment of the H atoms. A Hirshfeld surface analysis of the inter-molecular inter-actions is presented.
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Affiliation(s)
- Masoud Mirzaei
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 9177948974, Mashhad, Iran
| | - Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 9177948974, Mashhad, Iran
| | - Pouria Ebtehaj
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 9177948974, Mashhad, Iran
| | - Joel T. Mague
- Department of Chemistry, Tulane University, New Orleans, LA 70118, USA
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Daly L, Lee MR, Piazolo S, Griffin S, Bazargan M, Campanale F, Chung P, Cohen BE, Pickersgill AE, Hallis LJ, Trimby PW, Baumgartner R, Forman LV, Benedix GK. Boom boom pow: Shock-facilitated aqueous alteration and evidence for two shock events in the Martian nakhlite meteorites. Sci Adv 2019; 5:eaaw5549. [PMID: 31517047 PMCID: PMC6726442 DOI: 10.1126/sciadv.aaw5549] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Nakhlite meteorites are ~1.4 to 1.3 Ga old igneous rocks, aqueously altered on Mars ~630 Ma ago. We test the theory that water-rock interaction was impact driven. Electron backscatter diffraction demonstrates that the meteorites Miller Range 03346 and Lafayette were heterogeneously deformed, leading to localized regions of brecciation, plastic deformation, and mechanical twinning of augite. Numerical modeling shows that the pattern of deformation is consistent with shock-generated compressive and tensile stresses. Mesostasis within shocked areas was aqueously altered to phyllosilicates, carbonates, and oxides, suggesting a genetic link between the two processes. We propose that an impact ~630 Ma ago simultaneously deformed the nakhlite parent rocks and generated liquid water by melting of permafrost. Ensuing water-rock interaction focused on shocked mesostasis with a high density of reactive sites. The nakhlite source location must have two spatially correlated craters, one ~630 Ma old and another, ejecting the meteorites, ~11 Ma ago.
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Affiliation(s)
- L. Daly
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
- Space Science and Technology Centre, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia
| | - M. R. Lee
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - S. Piazolo
- School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
| | - S. Griffin
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - M. Bazargan
- Department of Earth Sciences, Uppsala University, Uppsala, Sweden
| | - F. Campanale
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
- Dipartimento di Scienze della Terra, Università di Pisa, via Santa Maria 53, 56126, Pisa, Italy
| | - P. Chung
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - B. E. Cohen
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - A. E. Pickersgill
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - L. J. Hallis
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
| | - P. W. Trimby
- Oxford Instruments Nanoanalysis, High Wycombe HP12 3SE, UK
| | - R. Baumgartner
- Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052, Australia
| | - L. V. Forman
- Space Science and Technology Centre, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
| | - G. K. Benedix
- Space Science and Technology Centre, School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
- Department of Earth and Planetary Sciences, Western Australia Museum, Locked Bag 49, Welshpool, WA 6986, Australia
- Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719-2395, USA
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Sweet L, Henderson A, Fleet J, Graham K, Fox D, Bowman R, Ebert L, Bull A, Bass J, Downer T, Bazargan M. Australian midwifery standards assessment tool: Revalidation to the midwife standards for practice 2018. Women Birth 2019. [DOI: 10.1016/j.wombi.2019.07.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bazargan M, Mirzaei M, Franconetti A, Frontera A. On the preferences of five-membered chelate rings in coordination chemistry: insights from the Cambridge Structural Database and theoretical calculations. Dalton Trans 2019; 48:5476-5490. [PMID: 30920565 DOI: 10.1039/c9dt00542k] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The purpose of this review is to give an overview of three important N-bidentate ligands: 1,10-phenanthroline (phen), 2,2'-bipyridine (bpy), and ethylenediamine (en). We have not attempted to be comprehensive because of the huge amount of activity being done in coordination chemistry using these ligands. Instead we present a full structural and geometrical study by using the Cambridge Structural Database (CSD) combined with theoretical calculations that allow us to parameterize their coordinating properties and ability to coordinate to transition and non-transition metals. More importantly, we illustrate that upon coordination and formation of the five-membered chelate ring, these ligands are able to adapt themselves to the requirements of the different metals by changing the MN distances and NMN angles. Therefore, a redefinition of the preferences of these ligands to metals with large ionic radii is needed. Finally, we will present some facts about the participation of these ligands in inorganic-organic hybrids (IOHs) based on Keggin polyoxometalates (POMs).
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Affiliation(s)
- Maryam Bazargan
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 917751436, Mashhad, Iran.
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Heravi MM, Mirzaei M, Beheshtiha SYS, Zadsirjan V, Mashayekh Ameli F, Bazargan M. H5
BW12
O40
as a green and efficient homogeneous but recyclable catalyst in the synthesis of 4H
-Pyrans via
multicomponent reaction. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4479] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Majid M. Heravi
- Department of Chemistry, School of Science; Alzahra University; PO Box 1993891176, Vanak Tehran Iran
| | - Masoud Mirzaei
- Department of Chemistry, Faculty of Science; Ferdowsi University of Mashhad; 917751436 Mashhad Iran
| | | | - Vahideh Zadsirjan
- Department of Chemistry, School of Science; Alzahra University; PO Box 1993891176, Vanak Tehran Iran
| | - Fatemeh Mashayekh Ameli
- Department of Chemistry, School of Science; Alzahra University; PO Box 1993891176, Vanak Tehran Iran
| | - Maryam Bazargan
- Department of Chemistry, Faculty of Science; Ferdowsi University of Mashhad; 917751436 Mashhad Iran
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Sweet L, Bazargan M, McKellar L, Gray J, Henderson A. Validation of the Australian Midwifery Standards Assessment Tool (AMSAT): A tool to assess midwifery competence. Women Birth 2018; 31:59-68. [DOI: 10.1016/j.wombi.2017.06.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 06/13/2017] [Accepted: 06/16/2017] [Indexed: 10/19/2022]
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Heidary Z, Mojra A, Shirazi M, Bazargan M. A novel approach for early evaluation of orthodontic process by a numerical thermomechanical analysis. Int J Numer Method Biomed Eng 2018; 34:e2899. [PMID: 28544269 DOI: 10.1002/cnm.2899] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 04/10/2017] [Accepted: 05/17/2017] [Indexed: 06/07/2023]
Abstract
The main objective of this paper is to propose a novel method that provides an opportunity to evaluate an orthodontic process at early phase of the treatment. This was accomplished by finding out a correlation between the applied orthodontic force and thermal variations in the tooth structure. To this end, geometry of the human tooth surrounded by the connective soft tissue called the periodontal ligament and the bone was constructed by employing dental CT scan images of a specific case. The periodontal ligament was modeled by finite strain viscoelastic model through a nonlinear stress-strain relation (hyperelasticity) and nonlinear stress-time relation (viscoelasticity). The tooth structure was loaded by a lateral force with 15 different quantities applied to 20 different locations, along the midedge of the tooth crown. The resultant compressive stress in the periodontal ligament was considered as the cause of elevated cell activity that was modeled by a transient heat flux in the thermal analysis. The heat flux value was estimated by conducting an experiment on a pair of rats. The numerical results showed that by applying an orthodontic force to the tooth structure, a significant temperature rise was observed. By measuring the temperature rise, the orthodontic process can be evaluated.
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Affiliation(s)
- Z Heidary
- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
| | - A Mojra
- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
| | - M Shirazi
- Department of Orthodontics and Dental Research Centre, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | - M Bazargan
- Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
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Bazargan M, Mirzaei M, Samanian M, Najafi A, Mague J. Synthesis and X-ray characterization of a new hybrid-based polyoxometalate. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s2053273317088416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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18
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Bazargan M, Donnellan-Fernandez R, Graham K. What do we understand about maternal–fetal drug disposition? Critical issues and knowledge for midwives practicing across the childbearing continuum. Women Birth 2017. [DOI: 10.1016/j.wombi.2017.08.121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Sweet L, Henderson A, Gray J, Barnes M, McKeller L, Bazargan M. Australian Midwifery Standards Assessment Tool: A valid midwifery clinical practice assessment tool. Women Birth 2017. [DOI: 10.1016/j.wombi.2017.08.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bazargan M, Smith J, Movassaghi M, Mortazavi S, Yazdanshenas H, Martins D, Orum G. CORRELATES OF ADHERENCE TO DRUG REGIMEN AMONG UNDERSERVED OLDER AFRICAN AMERICAN ADULTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M. Bazargan
- Charles R. Drew University of Medicine and Science, Los Angeles, California,
- UCLA, Los Angeles, California,
| | - J. Smith
- Charles R. Drew University of Medicine and Science, Los Angeles, California,
| | | | - S. Mortazavi
- School of Behavioral Sciences and Mental Health, Tehran, Iran (the Islamic Republic of)
| | - H. Yazdanshenas
- Charles R. Drew University of Medicine and Science, Los Angeles, California,
| | - D. Martins
- Charles R. Drew University of Medicine and Science, Los Angeles, California,
| | - G. Orum
- Keck Graduate Institutes, School of Pharmacy,
Claremont, California,
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21
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Bazargan M, Mirzaei M, Eshtiagh-Hosseini H, Mague JT, Bauzá A, Frontera A. Synthesis, X-ray characterization and DFT study of a novel Fe(III)–pyridine-2,6-dicarboxylic acid N-oxide complex with unusual coordination mode. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.04.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bazargan M, Foster DJR, Muhlhausler BS, Morrison JL, McMillen IC, Davey AK. Limited fetal metabolism of rosiglitazone: Elimination via the maternal compartment in the pregnant ewe. Reprod Toxicol 2016; 61:162-8. [DOI: 10.1016/j.reprotox.2016.04.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 03/21/2016] [Accepted: 04/07/2016] [Indexed: 11/16/2022]
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Mirzaei M, Eshtiagh-Hosseini H, Bazargan M, Mehrzad F, Shahbazi M, Mague JT, Bauzá A, Frontera A. Two new copper and nickel complexes of pyridine-2,6-dicarboxylic acid N-oxide and their proton transferred salts: Solid state and DFT insights. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.08.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Affiliation(s)
- S Juergens
- Gynecology, Tagesklinik Altonaer Strasse, Hamburg, Germany
| | - M Bazargan
- Gynecology, Tagesklinik Altonaer Strasse, Hamburg, Germany
| | - O Buchweitz
- Gynecology, Tagesklinik Altonaer Strasse, Hamburg, Germany
| | - A Hackethal
- Gynecology, Tagesklinik Altonaer Strasse, Hamburg, Germany
| | - W Specht
- Gynecology, Tagesklinik Altonaer Strasse, Hamburg, Germany
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Mirzaei M, Eshtiagh-Hosseini H, Bazargan M. Syntheses and X-ray crystal structure studies of four new coordination complexes and salts based on proton-transferred pyridine-2,6-dicarboxylic acid N-oxide. Res Chem Intermed 2015. [DOI: 10.1007/s11164-015-1965-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sefidgar M, Soltani M, Raahemifar K, Sadeghi M, Bazmara H, Bazargan M, Mousavi Naeenian M. Numerical modeling of drug delivery in a dynamic solid tumor microvasculature. Microvasc Res 2015; 99:43-56. [PMID: 25724978 DOI: 10.1016/j.mvr.2015.02.007] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 12/24/2014] [Accepted: 02/11/2015] [Indexed: 01/01/2023]
Abstract
The complicated capillary network induced by angiogenesis is one of the main reasons of unsuccessful cancer therapy. A multi-scale mathematical method which simulates drug transport to a solid tumor is used in this study to investigate how capillary network structure affects drug delivery. The mathematical method involves processes such as blood flow through vessels, solute and fluid diffusion, convective transport in extracellular matrix, and extravasation from blood vessels. The effect of heterogeneous dynamic network on interstitial fluid flow and drug delivery is investigated by this multi-scale method. The sprouting angiogenesis model is used for generating capillary network and then fluid flow governing equations are implemented to calculate blood flow through the tumor-induced capillary network and fluid flow in normal and tumor tissues. Finally, convection-diffusion equation is used to simulate drug delivery. Three approaches are used to simulate drug transport based on the developed mathematical method: without a vascular network, using a static vascular network, and a dynamic vascular network. The avascular approach predicts more uniform and higher drug concentration than vascular approaches since the simplified assumptions are implemented in this method. The dynamic network which uses more realistic assumptions predicts more irregular blood vessels, high interstitial pressure, and more heterogeneity in drug distribution than other two approaches.
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Affiliation(s)
- M Sefidgar
- Department of Mechanical Engineering, K.N.T. University of Technology, Tehran, Iran.
| | - M Soltani
- Department of Mechanical Engineering, K.N.T. University of Technology, Tehran, Iran; Division of Nuclear Medicine, Department of Radiology and Radiological Science, Johns Hopkins University, School of Medicine, MD, USA.
| | - K Raahemifar
- Electrical & Computer Department of Ryerson University, Toronto, Ontario, Canada.
| | - M Sadeghi
- Digital Health Hub, Simon Fraser University, Surrey, BC, Canada.
| | - H Bazmara
- Department of Mechanical Engineering, K.N.T. University of Technology, Tehran, Iran.
| | - M Bazargan
- Department of Mechanical Engineering, K.N.T. University of Technology, Tehran, Iran.
| | - M Mousavi Naeenian
- Department of Mechanical Engineering, K.N.T. University of Technology, Tehran, Iran.
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Buchweitz O, Juergens S, Nugent A, Biel P, Bazargan M, Krueger E, Nugent W, Moeller C. Surgical Treatment of Peritoneal Endometriosis: A Prospective Randomized Trial of Excision Versus Ablation for Mild Endometriosis. J Minim Invasive Gynecol 2013. [DOI: 10.1016/j.jmig.2013.08.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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28
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Juergens S, Buchweitz O, Moeller C, Nugent W, Krueger E, Nugent A, Biel P, Bazargan M. A Randomized, Controlled Study Comparing the Cosmetic Outcome of a New Wound Closure Device with Prolene Suture Closing Caesarean Wounds. J Minim Invasive Gynecol 2013. [DOI: 10.1016/j.jmig.2013.08.307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Eidi A, Mortazavi P, Bazargan M, Zaringhalam J. Hepatoprotective activity of cinnamon ethanolic extract against CCI4-induced liver injury in rats. EXCLI J 2012; 11:495-507. [PMID: 27547174 PMCID: PMC4990741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 07/27/2012] [Indexed: 10/28/2022]
Abstract
The inner bark of cinnamon (Cinnamomum zeylanicum L.) is commonly used as a spice and has also been widely employed in the treatment and prevention of disease. The aim of the present study is to evaluate the protective effect of cinnamon bark extract against carbon tetrachloride (CCl4)-induced liver damage in male Wistar rats. Administration with cinnamon extracts (0.01, 0.05 and 0.1 g/kg) for 28 days significantly reduced the impact of CCl4 toxicity on the serum markers of liver damage, aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase. In addition, treatment of cinnamon extract resulted in markedly increased the levels of superoxide dismutase and catalase enzymes in rats. The histopathological studies in the liver of rats also supported that cinnamon extract markedly reduced the toxicity of CCl4 and preserved the histoarchitecture of the liver tissue to near normal. Thus, the results suggest that cinnamon extract acts as a potent hepatoprotective agent against CCl4 induced hepatotoxicity in rats.
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Affiliation(s)
- Akram Eidi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Pejman Mortazavi
- Department of Pathology, Faculty of Specialized Veterinary Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Maryam Bazargan
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Jalal Zaringhalam
- Department of Physiology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Bazargan M, Hussey DJ, Schloithe AC, Blackshaw LA, Davison JS, Toouli J, Saccone GTP. Pain-related gene expression profile during the onset and resolution of caerulein-induced acute pancreatitis in mice. Pancreatology 2011; 12:41-3. [PMID: 22487473 DOI: 10.1016/j.pan.2011.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Zamani-Alavijeh F, Bazargan M, Shafiei A, Bazargan-Hejazi S. The frequency and predictors of helmet use among Iranian motorcyclists: A quantitative and qualitative study. Accid Anal Prev 2011; 43:1562-1569. [PMID: 21545891 DOI: 10.1016/j.aap.2011.03.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 03/18/2011] [Accepted: 03/19/2011] [Indexed: 05/30/2023]
Abstract
OBJECTIVE This study examines the rate of helmet use and identifies barriers and facilitators of wearing helmets among Iranian motorcyclists. A mixed-method approach was used, including a structured seasonal survey with specific observations of a random sample of 6010 riders and qualitative methods that included 29 in-depth interviews and seven focus groups (n=31). RESULTS Only 10% of motorcyclists wear a standard helmet while riding. However, another 23% of motorcyclists used non-standard or partial helmets that covered only part of the head and do not prevent head trauma injuries effectively. We observed only 2 of 264 child passengers and 22 of 1951 adult passengers wearing helmets. Almost no one used protective pants or clothing made to be more visible in traffic. Themes emerged from qualitative interviews and were grouped into three main categories: (1) helmet characteristics; (2) social and cultural factors; and (3) personal and psychological factors. CONCLUSION Overall, the motorcyclists in our study believed that wearing a safety helmet protects them against serious injuries or death during a crash; however, only a small percentage of the motorcyclists used safety helmets. National intervention programs addressing motorcycle safety should aim to overcome barriers to and promote facilitators of helmet use, including providing inexpensive standard helmets, banning manufacturing/using unsafe partial or dummy helmets, as well as enforcing helmet use on a consistent basis.
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Affiliation(s)
- Fereshteh Zamani-Alavijeh
- Department of Public Health, Faculty of Health, Ahvaz Jundishapur University Medical Sciences, Ahvaz, Iran
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Barreto SG, Bazargan M, Zotti M, Hussey DJ, Sukocheva OA, Peiris H, Leong M, Keating DJ, Schloithe AC, Carati CJ, Smith C, Toouli J, Saccone GTP. Galanin receptor 3--a potential target for acute pancreatitis therapy. Neurogastroenterol Motil 2011; 23:e141-51. [PMID: 21303427 DOI: 10.1111/j.1365-2982.2010.01662.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Galanin participates in the pathogenesis of acute pancreatitis (AP). The galanin receptor (GALR) sub-types involved, however, are unclear. We aimed to determine GALRs messenger RNA (mRNA) expression in mouse pancreas, describe their localization, and ascertain if GALR2 and GALR3 are involved in AP. METHODS Galanin receptor expression in murine whole pancreas, acinar, and islet cells was quantified by polymerase chain reaction amplification of reverse-transcribed RNA for mRNA, Western blot analysis for protein and in situ hybridization for GALR localization. Isolated acinar cells were used to determine galanin's effect on amylase secretion. Acute pancreatitis was induced in mice by caerulein injections. Mice, with and without AP, were treated with the highly selective GALR2 antagonist M871, or the specific GALR3 antagonist SNAP-37889. Indices of AP were measured at 12 h. KEY RESULTS Murine pancreas expresses mRNA for GALRs. In islets the expression of all GALR are comparable, whereas in acinar cells GALR3 is predominantly expressed. Western blot analysis confirmed that the GALR proteins are expressed by acinar cells. In situ hybridization analysis confirmed that GALR3 mRNA is present in islet and acinar cells, while mRNA for GALR1 and 2 is confined to islets. Galanin did not influence basal and caerulein-stimulated amylase release from acinar cells. M871 treatment reduced some, whereas SNAP-37889 treatment reduced all indices of AP (by 40-80%). CONCLUSIONS & INFERENCES Galanin receptor mRNA and protein are expressed in mouse pancreas, with GALR3 mRNA predominating. GALR3 antagonism reduced the severity of AP whereas GALR2 antagonism was less effective. GALR3 is a potential target for treatment of AP.
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Affiliation(s)
- S G Barreto
- Department of Surgery, Flinders Medical Centre, Flinders University, Adelaide, South Australia, Australia
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Faghihi M, Mirershadi F, Dehpour AR, Bazargan M. Preconditioning with acute and chronic lithium administration reduces ischemia/reperfusion injury mediated by cyclooxygenase not nitric oxide synthase pathway in isolated rat heart. Eur J Pharmacol 2008; 597:57-63. [DOI: 10.1016/j.ejphar.2008.08.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Revised: 08/13/2008] [Accepted: 08/20/2008] [Indexed: 10/21/2022]
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Bazargan M, Faghihi M, Chitsaz M. Importance of timing of magnesium administration in the isolated ischemic-reperfused rat heart: role of K(ATP) channels. Physiol Res 2007; 57:839-846. [PMID: 18052684 DOI: 10.33549/physiolres.931235] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
There is a growing interest for the beneficial effect of magnesium (Mg) in cardiovascular disorders. A number of cardiovascular disorders including myocardial infarction, arrhythmias and congestive heart failure have been associated with low extra- cellular or intracellular concentrations of Mg. The efficiency of the preconditioning effect of Mg on cardiac function and infarct size in the globally ischemic-reperfused isolated rat heart was studied together with the role of ATP-sensitive potassium (K(ATP)) channels in protection induced by Mg. Rat hearts were Langendorff perfused, subjected to 30 min of global ischemia and 90 min of reperfusion, including treatment groups which focused on different times of Mg (8 mmol/l) use. Infarct size was measured by triphenyltetrazolium chloride (TTC) method. The left ventricular function was assessed by left ventricular developed pressure (LVDP), heart rate (HR) and coronary flow (CF). The administration of Mg before ischemia had an anti-infarct effect in rat hearts and improved cardiac function. The protective effects of magnesium was abolished by the blocking of K(ATP) channels and suggests that K-ATP channel has an important role in the heart protection effect of Mg as a preconditioning agent.
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Affiliation(s)
- M Bazargan
- Department of Physiology, Faculty of Medicine, Tehran Medical Sciences University, Tehran, Iran.
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Chitsaz M, Barton M, Bazargan M, Kamalinejad M. P805 Essential oil composition and antibacterial effects of Ziziphora clinopodioides. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)70646-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chitsaz M, Barton M, Bazargan M, Badami N, Sedaghat R. P1800 Do enterotoxins and toxic shock syndrome toxin-1 of Staphylococcus aureus contribute in the pathogenesis of septic arthritis? Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71639-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yan A, Mekikian A, Bazargan M, Chandramohan G. Adequacy of Urinary Tract Infection Management Among Minority Underserved Children. J Urol 2006. [DOI: 10.1016/s0022-5347(05)00277-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- A. Yan
- Department of Pediatrics, Charles R. Drew University of Medicine and Science, Los Angeles, California
| | - A. Mekikian
- Department of Pediatrics, Charles R. Drew University of Medicine and Science, Los Angeles, California
| | - M. Bazargan
- Department of Pediatrics, Charles R. Drew University of Medicine and Science, Los Angeles, California
| | - G. Chandramohan
- Department of Pediatrics, Charles R. Drew University of Medicine and Science, Los Angeles, California
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Hsia SH, Bazargan M, Davidson MB, Drew CR. EFFECTIVENESS OF THE AYURVEDIC HERBAL SUPPLEMENT PANCREAS TONIC® IN PATIENTS WITH TYPE 2 DIABETES MELLITUS. J Investig Med 2004. [DOI: 10.1097/00042871-200401001-00159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hsia SH, Bazargan M, Davidson MB, Drew CR. 159 EFFECTIVENESS OF THE AYURVEDIC HERBAL SUPPLEMENT PANCREAS TONIC® IN PATIENTS WITH TYPE 2 DIABETES MELLITUS. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl1-159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Bazargan M, Bazargan SH, Calderón JL, Husaini BA, Baker RS. Mammography screening and breast self-examination among minority women in public housing projects: the impact of physician recommendation. Cell Mol Biol (Noisy-le-grand) 2003; 49:1213-8. [PMID: 14983989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
This exploratory study examined the impact of physician recommendations and other factors on mammography screening and breast-self examination (BSE) among African American and Hispanic women in public housing communities. We surveyed a randomly selected sample of low-income households from three low-income communities (n = 291), which included both African Americans and Hispanic women. Data for this paper are reported only on women who were 40 years and older head of the households (n = 120 women, including 74 Hispanics and 46 African Americans), since they meet the age criterion for mammography screening. Our analyses indicated that only 46% of women obtained mammography in the previous 12 months, with no significant differences between the Hispanic and African American women in mammography rates. Physicians' recommendations were among the most significant and substantial predictors of obtaining a mammogram or performing BSE. Further, odds were also higher for those who had insurance coverage. In addition, our data also indicated that almost one out of four women, aged 40 and older participants in this study, claimed that their health care providers never told them they needed a mammogram or never told them that they should perform BSE, with no significant differences between Hispanic and African Americans. Our analyses points to an urgent need for intervention to inform and motivate the service providers in underserved communities to motivate breast cancer screening (BCS) among minority women. Additionally, our examination points to the need for urgent interventions targeting minority women, particularly women with no medical insurance for breast cancer screening.
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Affiliation(s)
- M Bazargan
- Research Centers in Minority Institutions, Charles R Drew University of Medicine & Science, 1731 East 120th Street, Los Angeles, CA 90059, USA.
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Johnson KH, Bazargan M, Cherpitel CJ. Alcohol, tobacco, and drug use and the onset of type 2 diabetes among inner-city minority patients. J Am Board Fam Pract 2001; 14:430-6. [PMID: 11757885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
BACKGROUND We examined the prevalence of alcohol, tobacco, and drug use and their relation to the age of onset of type 2 diabetes among inner-city minority diabetic patients who sought routine care at medical clinics in south central Los Angeles. METHODS A cross-sectional study design was used to sample 392 diabetic patients. Consecutive patients from seven different primary care clinics were interviewed to determine their alcohol, tobacco, and drug use histories and the age of onset of diabetes. RESULTS The study sample was 61% Hispanic and 64% female and had a mean age of 53 years. Seventy-one diabetic patients (18%) reported that they recently consumed alcohol. Sixty-nine patients (17%) reported smoking within 30 days of their interview. Thirty-eight diabetic patients reported a history of regular illicit drug use. Multiple regression analysis showed that diabetic patients who used alcohol, illicit drugs, or combined substances (alcohol and illicit drugs), but not tobacco alone, reported an earlier onset of type 2 diabetes. CONCLUSIONS This hypothesis-generating study suggests that alcohol and illicit drugs, when used alone or in combination, might be associated with an earlier onset of type 2 diabetes. Additional research, however, is required to evaluate further these preliminary findings.
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Affiliation(s)
- K H Johnson
- Collaborative Alcohol Research Center, Charles R. Drew University of Medicine and Science, Los Angeles, CA 90047, USA
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Abstract
The limited number of studies concerning the prevalence of hearing loss and vision impairment and their causes, and the lack of strategies to prevent or treat the deleterious effects of hearing loss and vision impairment, point to a significant gap in the knowledge base concerning aged minority populations. This cross-sectional study evaluated the relationship between vision and hearing impairment and psychological well-being among a sample of 988 elderly African American persons. Fair or poor vision or hearing was reported for 36.5% and 26% of our sample, respectively. Reported prevalence rates for these impairments are considerably higher than rates previously documented in comparable studies of elderly people conducted in general (i.e., predominantly White) populations. Eighty-four percent of our study participants attempted to improve their vision through the use of eyeglasses. By contrast, only 4.3% of individuals in the study who described their hearing as poor reported using hearing aids. Using multivariate analysis and other related variables that have previously been identified as common predictors of psychological well-being, the findings of this study suggest that poor vision is independently associated with a lower level of psychological well-being among aged African Americans even after adjusting for sociodemographic characteristics, functional limitations, perceived health status, and cognition. Poor hearing was also found to be associated with a lower level of psychological well-being; however, this relationship was not independent but was mediated by the effect of hearing on functional status. These data indicate considerable potential for improved psychological well-being for African American elderly people through visual and audiological rehabilitation.
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Affiliation(s)
- M Bazargan
- Department of Family Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, California 90059, USA.
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Abstract
PURPOSE The prevalence and correlates of paranoid ideation were investigated. DESIGN AND METHODS On the basis of a sample of 998 independently living elderly African American persons in a cross-sectional study, the study used the Brief Symptom Inventory to measure paranoid ideation and 14 independent variables, including demographic characteristics, cognitive deficit, depression, self-reported memory functioning, emotional and instrumental support, stressful life events, limitation of daily activities, self-rated health status, and self-rated hearing and vision. RESULTS AND IMPLICATIONS Paranoid ideation (symptoms of paranoia) was found in 10% of this sample. A multiple regression analysis of the data revealed that of the 14 independent variables used in this study, 6 (income, instrumental support, hearing, stressful life events, self-reported memory deficit, and depression) showed a significant relationship with paranoid ideation.
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Affiliation(s)
- M Bazargan
- Department of Family Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA 90059, USA.
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Vojdani A, Bazargan M, Vojdani E, Wright J. New evidence for antioxidant properties of vitamin C. Cancer Detect Prev 2001; 24:508-23. [PMID: 11198264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
This study was designed to examine the effect of 500 to 5,000 mg of ascorbic acid on DNA adducts, natural killer (NK) cell activity, programmed cell death, and cell cycle analysis of human peripheral blood leukocytes. According to our hypothesis, if ascorbic acid is a pro-oxidant, doses between 500 and 5,000 mg should enhance DNA adduct formation, decrease immune function, change the cell cycle progression, and increase the rate of apoptosis. Twenty healthy volunteers were divided into four groups and given either placebo or daily doses of 500, 1,000 or 5,000 mg of ascorbic acid for a period of 2 weeks. On days 0, 1, 7, 15, and 21, blood was drawn from them, and the leukocytes were separated and examined for intracellular levels of ascorbic acid, the level of 8-hydroxyguanosine, NK cell activity, cell cycle progression, and apoptosis. Depending on the subjects, between a 0% and a 40% increase in cellular absorption of ascorbic acid was observed when daily doses of 500 mg were used. At doses greater than 500 mg, this cellular absorption was not increased further, and all doses produced equivalent increases in ascorbic acid on days 1 to 15. This increase in cellular concentration of ascorbic acid resulted in no statistically meaningful changes in the level of 8-hydroxyguanosine, increased NK cytotoxic activity, a reduced percentage of cells undergoing apoptosis, and switched cell cycle phases from S and G2/M to G0/G1. After a period of 1 week, with no placebo or vitamin washout, ascorbic acid levels along with functional assays returned to the baseline and became equivalent to placebos. In comparison with baseline values, no change (not more than daily assays variation) was seen in ascorbate concentrations or other assays during oral placebo treatment. We concluded that ascorbic acid is an antioxidant and that doses up to 5,000 mg neither induce mutagenic lesions nor have negative effects on NK cell activity, apoptosis, or cell cycle.
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Affiliation(s)
- A Vojdani
- Immunosciences Lab, Inc, Beverly Hills, CA 90211, USA
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Abstract
OBJECTIVE To examine the relation between alcohol consumption and self-reported compliance with prescribed therapies for type 2 diabetes mellitus among underserved minority patients. DESIGN Cross-sectional sampling of consecutive patients with diabetes was performed following routine visits to their primary care physicians. Interviewers measured compliance using the Summary of Diabetes Self-Care Questionnaire and alcohol use using the timeline followback method and the Alcohol Use Disorders Identification Test. SETTING Seven inner-city medical clinics that provide primary care services to low-income residents of South Central Los Angeles, Calif. PARTICIPANTS A total of 392 ethnic minority patients (61% Hispanic, 29% African American) with type 2 diabetes mellitus. MAIN OUTCOME MEASURES Self-report compliance with prescribed diet, exercise, home glucose monitoring, medications, and outpatient follow-up. RESULTS Drinking any alcohol-containing beverage within 30 days was associated with poorer adherence to prescribed dietary recommendations for the consumption of fiber (t = 2.4; P<.05), fat (t = 4.2; P<.01), sweets (t = 2.7; P<.01), and energy (calories) (t = 2.0; P<.05). Drinkers were also less likely to exercise for at least 20 minutes per day (t = 2.2; P<.05), comply with oral medication regimens (t = 4.6; P<.01), or attend outpatient follow-up visits (r = -0.11; P<.05). Alcohol use did not significantly alter compliance with home glucose monitoring, insulin use, or hemoglobin A(1c) levels, although there was a trend toward higher hemoglobin A(1c) levels among drinkers (11.0 vs 10.4). Multivariate analysis of the data demonstrates that when demographic characteristics, health care utilization, and other diabetes-related variables are held constant, the relation between alcohol use and dietary compliance remained significant. CONCLUSION Alcohol consumption may be associated with poorer compliance with recommendations for some self-care behaviors among inner-city minority patients with diabetes. Arch Fam Med. 2000;9:964-970
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Affiliation(s)
- K H Johnson
- Department of Family Medicine, Charles R. Drew University of Science and Medicine, Los Angeles, CA, USA.
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Bazargan M, Kelly EM, Stein JA, Husaini BA, Bazargan SH. Correlates of HIV risk-taking behaviors among African-American college students: the effect of HIV knowledge, motivation, and behavioral skills. J Natl Med Assoc 2000; 92:391-404. [PMID: 10992684 PMCID: PMC2608615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
This study identifies theoretically based predictors of condom use in a sample of 253 sexually active African-American college students recruited from two historically African-American colleges. The Information-Motivation-Behavioral (IMB) skills model of AIDS-preventive behavior was employed to delineate the roles of HIV/AIDS knowledge, experiences with and attitudes toward condom use, peer influences, perceived vulnerability, monogamy, and behavioral skills. A predictive structural equation model revealed significant predictors of more condom use including: male gender, more sexual HIV knowledge, positive experiences and attitudes about condom use, nonmonogamy, and greater behavioral skills. Results imply that attention to behavioral skills for negotiating safer sex and training in the proper use of condoms are key elements in reducing high risk behaviors. Increasing the specific knowledge level of college students regarding the subtleties of sexual transmission of HIV is important and should be addressed. Heightening students' awareness of the limited protection of serial monogamy, and the need to address gender-specific training regarding required behavior change to reduce transmission of HIV should be an additional goal of college health professionals.
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Affiliation(s)
- M Bazargan
- Charles R. Drew University of Medicine & Science, Los Angeles, CA 90059, USA
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Sklansky J, Tao EY, Bazargan M, Ornes CJ, Murchison RC, Teklehaimanot S. Computer-aided, case-based diagnosis of mammographic regions of interest containing microcalcifications. Acad Radiol 2000; 7:395-405. [PMID: 10845398 DOI: 10.1016/s1076-6332(00)80379-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
RATIONALE AND OBJECTIVES The purpose of this study was to evaluate the effectiveness of a mapped-database diagnostic system in reducing the incidence of benign biopsies and misdiagnosed cancers among mammographic regions of interest (ROIs). MATERIALS AND METHODS A novel neural network was devised (a) to respond to a query ROI by recommending to biopsy or not to biopsy and (b) to map each ROI in the database as a dot on a computer screen. The network was designed so that clusters in the array of dots help the radiologist to find proved ROIs visually similar to the query ROI. This mapped-database diagnostic system was restricted to ROIs with visible microcalcifications. The neural network was trained with a stored database of 80 biopsy-proved ROIs. RESULTS Four radiologists acting independently on 100 ROIs recommended biopsies for 18, 15, 28, and 18 benign ROIs and misdiagnosed cancers in 11, 12, 7, and eight ROIs, respectively. Interaction with the mapped-database system reduced the numbers of benign biopsies to 11, eight, 18, and 10 cases and of misdiagnosed cancers to eight, seven, four, and three cases, respectively. Statistical analysis indicated that three radiologists achieved significant improvements at P < or = .02 and the fourth achieved a substantial improvement at P < or = .07. CONCLUSION By using a mapped database of proved mammographic ROIs containing microcalcifications, radiologists may statistically significantly reduce the numbers of benign biopsies and misdiagnosed cancers.
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Affiliation(s)
- J Sklansky
- Department of Radiology, Charles R. Drew University of Medicine and Science, Los Angeles, Calif, USA
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Baker RS, Watkins NL, Wilson MR, Bazargan M, Flowers CW. Demographic and clinical characteristics of patients with diabetes presenting to an urban public hospital ophthalmology clinic. Ophthalmology 1998; 105:1373-9. [PMID: 9709745 DOI: 10.1016/s0161-6420(98)98015-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
OBJECTIVE This study aims to describe the clinical and sociodemographic characteristics of patients with diabetes who are newly presenting to an inner city public hospital eye clinic. This study also aims to determine the prevalence and severity of ocular morbidity in this population at time presentation and to assess the adequacy of the ophthalmic surveillance to which this population was exposed before presentation. DESIGN A clinic-based, cross-sectional study. PARTICIPANTS A total of 118 consecutive patients with diabetes participated. METHOD During a 2-month interval, all patients with diabetes newly presenting to the Los Angeles County King-Drew Medical Center eye clinic were recruited who were at risk for diabetic eye complications according to American Diabetes Association criteria. Each patient underwent a standardized interviewer-administered questionnaire and a comprehensive ophthalmic examination. RESULTS Of the 118 patients, 65 (55%) were Hispanic and 51 (43%) were African American. Forty-six percent had a grade school education or less, 91% were unemployed, and 64% had no health insurance. Type two diabetes was predominant (91%), including 24 (22%) of new onset. Thirty-six patients with diabetes (31%) reported duration of diabetes greater than 10 years at time of presentation. At time of presentation, 62% had clinically apparent ophthalmic disease, whereas 40% had advanced ocular disease, including 6.8% of the sample that were legally blind. Sixty-nine patients (58.5%) reported never having had a dilated fundus examination, whereas 31 (63%) of the 49 patients reporting a previous dilated examination were last examined more than 2 years before presentation. Timing of ophthalmic examination was classified as appropriate for 38 patients (32%), marginal for 20 patients (17%), and inappropriate for 60 patients (51%). CONCLUSION In the setting of an inner city county hospital eye clinic, where the patient population is predominately minority and of low socioeconomic status, ophthalmic surveillance of high-risk patients with diabetes is inadequate and advanced disease often is present at initial presentation. Strategies must be developed to increase the routine use of eye services within this population.
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Affiliation(s)
- R S Baker
- Division of Ophthalmology, Charles R. Drew University of Medicine and Science, Los Angeles, California 90059, USA
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Abstract
This study uses a theoretical model of health services utilization to assess the effects of predisposing, enabling, and need-for-care characteristics on recency of eye examinations among a sample of 998 elderly African-American persons. More than 64% of participants reported that they had had eye examinations within the last 12 months. Multiple logistics regression analysis explains 13.3% of the variance of eye examinations. This data indicates that recency of eye examination is related to health locus of control, private insurance, Medicare, insulin-dependent diabetes, and presence of eye disease. No significant relationship between recency of eye examination and self-rated health status, social support, vision impairment, and non-insulin-dependent diabetes were detected. The lack of association between non-insulin-dependent diabetes and the recency of eye examination suggests that the amount of preventive care in place may not be adequate. This data shows that the unique contributions of need characteristics account for a major variance of recency of eye examination. However, enabling characteristics play a significant role in sending the participants of this study to eye-specialists, even after need-for-care factors are held constant.
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Affiliation(s)
- M Bazargan
- Department of Family Medicine, Charles R. Drew University of Medicine & Science, Los Angeles, CA 90059, USA
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Bazargan M, Bazargan S, Baker RS. Emergency department utilization, hospital admissions, and physician visits among elderly African American persons. Gerontologist 1998; 38:25-36. [PMID: 9499651 DOI: 10.1093/geront/38.1.25] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
This study uses a theoretical model of health services utilization to examine (a) emergency department utilization, (b) hospital admissions, and (c) office-based physician visits among a sample of 998 low-income elderly African American persons. Poisson Regression analysis was used to estimate the parameters specified in the Andersen behavioral model. Some of the more interesting results include the following: (a) a greater frequency of emergency room visits among respondents with a lower level of accessibility to physician services, (b) a lack of a significant relationship between some chronic illnesses such as diabetes and heart problems and the frequency of office-based physician visits, (c) a greater number of hospital admissions among insured persons, and (d) a significant impact of the health locus of control indexes on all three types of health care utilization. The results of this study challenge the assumption that hospital and emergency use are the results of nondiscretionary behavior.
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Affiliation(s)
- M Bazargan
- Charles Drew University of Medicine and Science, Research Centers in Minority Institutions, Los Angeles, CA 90059, USA. mobazarg.cdrewu.edu
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