1
|
Rouabhia F, Hamlaoui Y, Meroufel A, Pedraza F. Corrosion properties of ceria-based coating electrodeposited from alkaline bath on electrogalvanized steel. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-020-01517-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
2
|
Boissonnet G, Bonnet G, Pasquet A, Bourhila N, Pedraza F. Evolution of thermal insulation of plasma-sprayed thermal barrier coating systems with exposure to high temperature. Ann Ital Chir 2019. [DOI: 10.1016/j.jeurceramsoc.2019.01.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
3
|
Pramanik A, Jones S, Pedraza F, Vangara A, Sweet C, Williams MS, Ruppa-Kasani V, Risher SE, Sardar D, Ray PC. Fluorescent, Magnetic Multifunctional Carbon Dots for Selective Separation, Identification, and Eradication of Drug-Resistant Superbugs. ACS Omega 2017; 2:554-562. [PMID: 28261690 PMCID: PMC5331453 DOI: 10.1021/acsomega.6b00518] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 02/03/2017] [Indexed: 05/21/2023]
Abstract
The emergence of drug-resistant superbugs remains a major burden to society. As the mortality rate caused by sepsis due to superbugs is more than 40%, accurate identification of blood infections during the early stage will have a huge significance in the clinical setting. Here, we report the synthesis of red/blue fluorescent carbon dot (CD)-attached magnetic nanoparticle-based multicolor multifunctional CD-based nanosystems, which can be used for selective separation and identification of superbugs from infected blood samples. The reported data show that multifunctional fluorescent magneto-CD nanoparticles are capable of isolating Methicillin-resistant Staphylococcus aureus (MRSA) and Salmonella DT104 superbug from whole blood samples, followed by accurate identification via multicolor fluorescence imaging. As multidrug-resistant (MDR) superbugs are resistant to antibiotics available in the market, this article also reports the design of antimicrobial peptide-conjugated multicolor fluorescent magneto-CDs for effective separation, accurate identification, and complete disinfection of MDR superbugs from infected blood. The reported data demonstrate that by combining pardaxin antimicrobial peptides, magnetic nanoparticles, and multicolor fluorescent CDs into a single system, multifunctional CDs represent a novel material for efficient separation, differentiation, and eradication of superbugs. This material shows great promise for use in clinical settings.
Collapse
Affiliation(s)
- Avijit Pramanik
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Stacy Jones
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Francisco Pedraza
- Department
of Physics and Astronomy, University of
Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0697, United States
| | - Aruna Vangara
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Carrie Sweet
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Mariah S. Williams
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Vikram Ruppa-Kasani
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Sean Edward Risher
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
| | - Dhiraj Sardar
- Department
of Physics and Astronomy, University of
Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0697, United States
| | - Paresh Chandra Ray
- Department
of Chemistry and Biochemistry, Jackson State
University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217-0510, United States
- E-mail: . Fax: +16019793674 (P.C.R.)
| |
Collapse
|
4
|
Almeida J, Biello KB, Pedraza F, Wintner S, Viruell-Fuentes E. The association between anti-immigrant policies and perceived discrimination among Latinos in the US: A multilevel analysis. SSM Popul Health 2016; 2:897-903. [PMID: 29349196 PMCID: PMC5757908 DOI: 10.1016/j.ssmph.2016.11.003] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [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: 01/07/2016] [Revised: 10/20/2016] [Accepted: 11/19/2016] [Indexed: 12/02/2022] Open
Abstract
Research has found a strong inverse association between discrimination and health and well-being. Most of these studies have been conducted among African-Americans, and have examined the relationship at the individual-level. To fill these gaps in knowledge we estimated the prevalence of perceived discrimination among a nationally representative sample of Latino adults in the US, and investigated the association between state-level anti-immigrant policies and perceived discrimination. We merged survey data with a state-level anti-immigrant policy index. First, we fit hierarchical logistic regression models to test the crude and adjusted association between anti-immigrant policies and perceived discrimination. Second, we specified cross-level interaction terms to test whether this association differed by relevant individual characteristics. Almost 70% of respondents reported discrimination (68.4%). More anti-immigrant policies were associated with higher levels of discrimination (OR=1.62, 95% CI 1.16, 2.24, p=0.01). The association between anti-immigrant policies and discrimination differed by place of origin (p=0.001) and was marginally moderated by generation status (p=0.124). Anti-immigrant policies stigmatize both foreign and US-born Latinos by creating a hostile social environment which affects their experiences of discrimination. These non-health policies can adversely affect Latino health, in part through exposure to discrimination, and may help explain health patterns among Latinos in the US. Most studies of discrimination in the United States (US) have been conducted at the individual level and among African Americans. The effects of anti-immigrant policies such as Arizona's SB-1070, have largely gone unexamined by health and social science researchers. This study documents the prevalence of discrimination among a nationally representative sample of Latino adults in the US, and examines the association between state-level anti-immigrant policies and perceived discrimination. The prevalence of discrimination among Latinos in the US is similar to that found among African Americans. More anti-immigrant policies are associated with higher perception of discrimination.
Collapse
Affiliation(s)
- Joanna Almeida
- Simmons School of Social Work, 300 The Fenway, Office P412-B, Boston, MA 02115, USA
| | - Katie B Biello
- Departments of Behavioral & Social Sciences and Epidemiology, Institute for Community Health Promotion, Brown University School of Public Health, Providence, RI, USA
| | - Francisco Pedraza
- School of Public Policy, University of California, Riverside. 4127 Interdisciplianary South. 900 University Avenue. Riverside, CA 92521 USA
| | - Suzanne Wintner
- Simmons School of Social Work, 300 The Fenway, Office P412-B, Boston, MA 02115, USA
| | - Edna Viruell-Fuentes
- Department of Latina/Latino Studies, University of Illinois at Urbana-Champaign, 1207 W. Oregon Street, M/C 136, Urbana, IL 61801, USA
| |
Collapse
|
5
|
Pedraza F, Mahadik SA, Bouchaud B. Synthesis of ceria based superhydrophobic coating on Ni20Cr substrate via cathodic electrodeposition. Phys Chem Chem Phys 2015; 17:31750-7. [PMID: 26562006 DOI: 10.1039/c5cp04723d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In this work, superhydrophobic cerium oxide coating surface (111) with dual scale texture on Ni20Cr substrate is obtained by combination of electropolishing the substrate and subsequent cathodic electrodeposition and long-term UVH surface relaxation. To form hierarchical structures of CeO2 is controllable by varying the substrate roughness, and electropolishing period. The results indicated that at the optimal condition, the surface of the cerium oxide coating showed a superhydrophobicity with a great water contact angle (151.0 ± 1.4°) with Gecko state. An interface model for electropolishing of substrate surface in cerium nitrate medium is proposed. We expect that this facile process can be readily and widely adopted for the design of superhydrophobic coating on engineering materials.
Collapse
Affiliation(s)
- F Pedraza
- Université de La Rochelle, Laboratoire des Sciences de L'Ingénieur pour l'Environnement (LaSIE, UMR-7356 CNRS-Université de La Rochelle), Avenue Michel Crépeau, 17042 La Rochelle cedex 01, France.
| | - S A Mahadik
- Université de La Rochelle, Laboratoire des Sciences de L'Ingénieur pour l'Environnement (LaSIE, UMR-7356 CNRS-Université de La Rochelle), Avenue Michel Crépeau, 17042 La Rochelle cedex 01, France.
| | - B Bouchaud
- Université de La Rochelle, Laboratoire des Sciences de L'Ingénieur pour l'Environnement (LaSIE, UMR-7356 CNRS-Université de La Rochelle), Avenue Michel Crépeau, 17042 La Rochelle cedex 01, France.
| |
Collapse
|
6
|
Nellore BPV, Kanchanapally R, Pedraza F, Sinha SS, Pramanik A, Hamme AT, Arslan Z, Sardar D, Ray PC. Bio-Conjugated CNT-Bridged 3D Porous Graphene Oxide Membrane for Highly Efficient Disinfection of Pathogenic Bacteria and Removal of Toxic Metals from Water. ACS Appl Mater Interfaces 2015; 7:19210-19218. [PMID: 26273843 DOI: 10.1021/acsami.5b05012c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
More than a billion people lack access to safe drinking water that is free from pathogenic bacteria and toxic metals. The World Health Organization estimates several million people, mostly children, die every year due to the lack of good quality water. Driven by this need, we report the development of PGLa antimicrobial peptide and glutathione conjugated carbon nanotube (CNT) bridged three-dimensional (3D) porous graphene oxide membrane, which can be used for highly efficient disinfection of Escherichia coli O157:H7 bacteria and removal of As(III), As(V), and Pb(II) from water. Reported results demonstrate that versatile membrane has the capability to capture and completely disinfect pathogenic pathogenic E. coli O157:H7 bacteria from water. Experimentally observed disinfection data indicate that the PGLa attached membrane can dramatically enhance the possibility of destroying pathogenic E. coli bacteria via synergistic mechanism. Reported results show that glutathione attached CNT-bridged 3D graphene oxide membrane can be used to remove As(III), As(V), and Pb(II) from water sample at 10 ppm level. Our data demonstrated that PGLa and glutathione attached membrane has the capability for high efficient removal of E. coli O157:H7 bacteria, As(III), As(V), and Pb(II) simultaneously from Mississippi River water.
Collapse
Affiliation(s)
- Bhanu Priya Viraka Nellore
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Rajashekhar Kanchanapally
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Francisco Pedraza
- Department of Physics and Astronomy, University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Sudarson Sekhar Sinha
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Avijit Pramanik
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Ashton T Hamme
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Zikri Arslan
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| | - Dhiraj Sardar
- Department of Physics and Astronomy, University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Paresh Chandra Ray
- Department of Chemistry and Biochemistry, Jackson State University , Jackson, Mississippi 39217, United States
| |
Collapse
|
7
|
Nellore BPV, Kanchanapally R, Pedraza F, Sinha SS, Pramanik A, Hamme AT, Arslan Z, Sardar D, Chandra Ray P. Bio-Conjugated CNT-Bridged 3D Porous Graphene Oxide Membrane for Highly Efficient Disinfection of Pathogenic Bacteria and Removal of Toxic Metals from Water. ACS Appl Mater Interfaces 2015; 7:19210-8. [PMID: 26273843 PMCID: PMC4690451 DOI: 10.1021/acsami.5b05012] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
More than a billion people lack access to safe drinking water that is free from pathogenic bacteria and toxic metals. The World Health Organization estimates several million people, mostly children, die every year due to the lack of good quality water. Driven by this need, we report the development of PGLa antimicrobial peptide and glutathione conjugated carbon nanotube (CNT) bridged three-dimensional (3D) porous graphene oxide membrane, which can be used for highly efficient disinfection of Escherichia coli O157:H7 bacteria and removal of As(III), As(V), and Pb(II) from water. Reported results demonstrate that versatile membrane has the capability to capture and completely disinfect pathogenic pathogenic E. coli O157:H7 bacteria from water. Experimentally observed disinfection data indicate that the PGLa attached membrane can dramatically enhance the possibility of destroying pathogenic E. coli bacteria via synergistic mechanism. Reported results show that glutathione attached CNT-bridged 3D graphene oxide membrane can be used to remove As(III), As(V), and Pb(II) from water sample at 10 ppm level. Our data demonstrated that PGLa and glutathione attached membrane has the capability for high efficient removal of E. coli O157:H7 bacteria, As(III), As(V), and Pb(II) simultaneously from Mississippi River water.
Collapse
Affiliation(s)
- Bhanu Priya Viraka Nellore
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Rajashekhar Kanchanapally
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Francisco Pedraza
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Sudarson Sekhar Sinha
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Avijit Pramanik
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Ashton T Hamme
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Zikri Arslan
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Dhiraj Sardar
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Paresh Chandra Ray
- Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
- Corresponding Author:., Fax: +16019793674
| |
Collapse
|
8
|
Shi Y, Pramanik A, Tchounwou C, Pedraza F, Crouch RA, Chavva SR, Vangara A, Sinha SS, Jones S, Sardar D, Hawker C, Ray PC. Multifunctional biocompatible graphene oxide quantum dots decorated magnetic nanoplatform for efficient capture and two-photon imaging of rare tumor cells. ACS Appl Mater Interfaces 2015; 7:10935-43. [PMID: 25939643 PMCID: PMC4570252 DOI: 10.1021/acsami.5b02199] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Circulating tumor cells (CTCs) are extremely rare cells in blood containing billions of other cells. The selective capture and identification of rare cells with sufficient sensitivity is a real challenge. Driven by this need, this manuscript reports the development of a multifunctional biocompatible graphene oxide quantum dots (GOQDs) coated, high-luminescence magnetic nanoplatform for the selective separation and diagnosis of Glypican-3 (GPC3)-expressed Hep G2 liver cancer tumor CTCs from infected blood. Experimental data show that an anti-GPC3-antibody-attached multifunctional nanoplatform can be used for selective Hep G2 hepatocellular carcinoma tumor cell separation from infected blood containing 10 tumor cells/mL of blood in a 15 mL sample. Reported data indicate that, because of an extremely high two-photon absorption cross section (40530 GM), an anti-GPC3-antibody-attached GOQDs-coated magnetic nanoplatform can be used as a two-photon luminescence platform for selective and very bright imaging of a Hep G2 tumor cell in a biological transparency window using 960 nm light. Experimental results with nontargeted GPC3(-) and SK-BR-3 breast cancer cells show that multifunctional-nanoplatform-based cell separation, followed by two-photon imaging, is highly selective for Hep G2 hepatocellular carcinoma tumor cells.
Collapse
Affiliation(s)
- Yongliang Shi
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Avijit Pramanik
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Christine Tchounwou
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Francisco Pedraza
- Department of Physics and Astronomy, University
of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Rebecca A. Crouch
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Suhash Reddy Chavva
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Aruna Vangara
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Sudarson Sekhar Sinha
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Stacy Jones
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
| | - Dhiraj Sardar
- Department of Physics and Astronomy, University
of Texas at San Antonio, San Antonio, Texas 78249, United States
| | - Craig Hawker
- Department of Chemistry and Biochemistry and Materials Research Laboratory, Materials Department, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - Paresh Chandra Ray
- Department of Chemistry
and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States
- E-mail:. Fax: +16019793674
| |
Collapse
|
9
|
Kanchanapally R, Viraka Nellore BP, Sinha SS, Pedraza F, Jones SJ, Pramanik A, Chavva SR, Tchounwou C, Shi Y, Vangara A, Sardar D, Ray PC. Antimicrobial Peptide-Conjugated Graphene Oxide Membrane for Efficient Removal and Effective Killing of Multiple Drug Resistant Bacteria. RSC Adv 2015; 5:18881-18887. [PMID: 26294958 PMCID: PMC4539267 DOI: 10.1039/c5ra01321f] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
According to the World Health Organization (WHO), multiple drug-resistant (MDR) bacterial infection is a top threat to human health. Since bacteria evolve to resist antibiotics faster than scientists can develop new classes of drugs, the development of new materials which can be used, not only for separation, but also for effective disinfection of drug resistant pathogens is urgent. Driven by this need, we report for the first time the development of a nisin antimicrobial peptide conjugated, three dimensional (3D) porous graphene oxide membrane for identification, effective separation, and complete disinfection of MDR methicillin-resistant Staphylococcus aureus (MRSA) pathogens from water. Experimental data show that due to the size differences, MRSA is captured by the porous membrane, allowing only water to pass through. SEM, TEM, and fluorescence images confirm that pathogens are captured by the membrane. RT-PCR data with colony counting indicate that almost 100% of MRSA can be removed and destroyed from the water sample using the developed membrane. Comparison of MDR killing data between nisin alone, the graphene oxide membrane and the nisin attached graphene oxide membrane demonstrate that the nisin antimicrobial peptide attached graphene oxide membrane can dramatically enhance the possibility of destroying MRSA via a synergestic effect due to the multimodal mechanism.
Collapse
Affiliation(s)
| | | | | | - Francisco Pedraza
- Department of Physics and Astronomy, University of Texas at San Antonio, TX, USA
| | | | | | | | | | | | | | - Dhiraj Sardar
- Department of Physics and Astronomy, University of Texas at San Antonio, TX, USA
| | | |
Collapse
|
10
|
Pedraza F, Yust B, Tsin A, Sardar D. NIR to NIR upconversion in KYb2F7: RE 3+ (RE = Tm, Er) nanoparticles for biological imaging. Proc SPIE Int Soc Opt Eng 2014; 8956. [PMID: 26120238 DOI: 10.1117/12.2037913] [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] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Until recently, many contrast agents widely used in biological imaging have absorbed and emitted in the visible region, limiting their usefulness for deeper tissue imaging. In order to push the boundaries of deep tissue imaging with non-ionizing radiation, contrast agents in the near infrared (NIR) regime, which is not strongly absorbed or scattered by most tissues, are being sought after. Upconverting nanoparticles (UCNPs) are attractive candidates since their upconversion emission is tunable with a very narrow bandwidth and they do not photobleach or blink. The upconversion produced by the nanoparticles can be tailored for NIR to NIR by carefully choosing the lanthanide dopants and dopant ratios such as KYb2F7: RE3+ (RE = Tm, Er). Spectroscopic characterization was done by analyzing absorption, fluorescence, and quantum yield data. In order to study the toxicity of the nanoparticles Monkey Retinal Endothelial Cells (MREC) were cultivated in 24 well plates and then treated with nanoparticles at different concentrations in triplicate to obtain the optimal concentration for in vivo experiments. It will be shown that these UCNPs do not elicit a strong toxic response such as quantum dots and some noble metal nanoparticles. 3-D optical slices of nanoparticle treated fibroblast cells were imaged using a confocal microscope where the nucleus and cytoplasm were stained with DAPI and Alexa Fluor respectively. These results presented support the initial assumption, which suggests that KYb2F7: RE3+ would be excellent candidates for NIR contrast agents.
Collapse
Affiliation(s)
- F Pedraza
- University of Texas at San Antonio, Physics and Astronomy Department
| | - B Yust
- University of Texas at San Antonio, Physics and Astronomy Department
| | - A Tsin
- University of Texas at San Antonio, Department of Biology
| | - D Sardar
- University of Texas at San Antonio, Physics and Astronomy Department
| |
Collapse
|
11
|
Contreras G, Li H, Gonzalez-Suarez M, Isakova T, Scialla JJ, Pedraza F, Mattiazzi A, Diaz-Wong R, Sageshima J, Brito Y, Guerra G, Acevedo B, Ali AS, Kershaw TJ, Chen L, Burke GW, Kupin W, Ciancio G, Roth D. Kidney allograft survival of African American and Caucasian American recipients with lupus. Lupus 2013; 23:151-8. [DOI: 10.1177/0961203313513819] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Background African Americans with lupus who receive kidney transplants have high prevalence of predictors of allograft failure, which can explain their poor outcomes. Methods Of 1223 African Americans and 1029 Caucasian Americans with lupus who received kidney transplants from deceased donors between 1987 and 2006 with complete records in the UNOS program, 741 pairs were matched in 16 predictors employing a predicted probability of group membership. The primary outcome was allograft failure. Main secondary outcomes were rejection, allograft failure due to rejection, and mortality. Results Matched pairs were predominantly women (82%) with a mean age of 39 years. Twenty-four percent of recipients received kidneys from expanded criteria donors. African Americans and Caucasian Americans matched well ( p ≥ 0.05): donor age, gender and race; recipient age, gender, education and insurance; dialysis prior to transplant, kidneys from expanded criteria donors, cold ischemia time, history of prior kidney transplant, panel reactive antibodies, human leukocyte antigens mismatch, blood type compatibility, transplant Era, and follow-up time. Contrary to the unmatched cohort with significantly higher allograft failure rate (events per 100 patient-years) in African Americans compared to Caucasian Americans (10.49 vs 6.18, p < 0.001), matched pairs had similar allograft failure rates (8.41 vs 7.81, p = 0.418). Matched pairs also had similar rates of rejections (9.82 vs 9.39, p = 0.602), allograft failure due to rejection (6.19 vs 5.71, p = 0.453), and mortality (2.79 vs 3.52, p = 0.097). Conclusion In lupus recipients of kidney transplants from deceased donors, African American and Caucasian Americans have similar allograft failure rates when predictors are matched between groups.
Collapse
Affiliation(s)
- G Contreras
- Division of Nephrology and Hypertension Department of Medicine
| | - H Li
- Division of Nephrology and Hypertension Department of Medicine
- Epidemiology and Public Health Department
| | | | - T Isakova
- Division of Nephrology and Hypertension Department of Medicine
| | - JJ Scialla
- Division of Nephrology and Hypertension Department of Medicine
| | - F Pedraza
- Division of Nephrology and Hypertension Department of Medicine
| | - A Mattiazzi
- Division of Nephrology and Hypertension Department of Medicine
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - R Diaz-Wong
- Division of Nephrology and Hypertension Department of Medicine
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - J Sageshima
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - Y Brito
- Division of Nephrology and Hypertension Department of Medicine
| | - G Guerra
- Division of Nephrology and Hypertension Department of Medicine
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - B Acevedo
- Division of Nephrology and Hypertension Department of Medicine
| | - A Sajid Ali
- Division of Nephrology and Hypertension Department of Medicine
| | - TJ Kershaw
- Division of Nephrology and Hypertension Department of Medicine
| | - L Chen
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - GW Burke
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - W Kupin
- Division of Nephrology and Hypertension Department of Medicine
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - G Ciancio
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| | - D Roth
- Division of Nephrology and Hypertension Department of Medicine
- Division of Transplantation Department of Surgery, Miller School of Medicine, University of Miami, FL, USA
| |
Collapse
|
12
|
Mimun LC, Ajithkumar G, Pokhrel M, Yust BG, Elliott ZG, Pedraza F, Dhanale A, Tang L, Lin AL, Dravid VP, Sardar DK. Bimodal Imaging Using Neodymium Doped Gadolinium Fluoride Nanocrystals with Near-Infrared to Near-Infrared Downconversion Luminescence and Magnetic Resonance Properties. J Mater Chem B 2013; 1:5702-5710. [PMID: 25584192 PMCID: PMC4288854 DOI: 10.1039/c3tb20905a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Here we report the synthesis, characterization and application of a multifunctional surface functionalized GdF3:Nd3+ nanophosphor that exhibits efficient near infrared (NIR) fluorescence as well as magnetic properties, which can be utilized for bimodal imaging in medical applications. The nanoparticles are small with an average size of 5 nm and form stable colloids that last for several weeks without settling, enabling the use for several biomedical and photonic applications. Their excellent NIR properties, such as nearly 11 % quantum yield of the 1064 nm emission, make them ideal contrast agents and biomarkers for in vitro and in vivo NIR optical bioimaging. The nanophosphors which were coated with poly(maleic anhydride- alt-1-octadicene) (PMAO) were implemented in cellular imaging and show no significant cellular toxicity for concentrations up to 200 μg ml-1. Furthermore, the incorporation of Gd into the nanocrystalline structure supplies exceptional magnetic properties, making them ideal for use as magnetic resonance imaging (MRI) contrast agents. The utility of these NIR emitting nanoparticles in infrared bioimaging and as contrast agent in magnetic resonance imaging was demonstrated by confocal imaging, magnetic resonance and tissue experiments.
Collapse
Affiliation(s)
- L. Christopher Mimun
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Gangadharan Ajithkumar
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Madhab Pokhrel
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Brian G. Yust
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Zak G. Elliott
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Francisco Pedraza
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Ashish Dhanale
- Department of Biomedical Engineering, University of Texas at San Antonio One UTSA Circle, San Antonio, Texas 78249, United States
| | - Liang Tang
- Department of Biomedical Engineering, University of Texas at San Antonio One UTSA Circle, San Antonio, Texas 78249, United States
| | - Ai-Ling Lin
- Research Imaging Institute, Barshop Institute and Department of Cellular & Structural Biology, University of Texas Health Science Center at San Antonio 7703 Floyd Curl Dr. # 209, San Antonio, TX 78229, United States
| | - Vinayak P. Dravid
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, United States
| | - Dhiraj K Sardar
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| |
Collapse
|
13
|
Bouchaud B, Balmain J, Bonnet G, Pedraza F. Correlations between electrochemical mechanisms and growth of ceria based coatings onto nickel substrates. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.10.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
14
|
Yust BG, Razavi N, Pedraza F, Elliott Z, Tsin AT, Sardar DK. Enhancement of nonlinear optical properties of BaTiO3 nanoparticles by the addition of silver seeds. Opt Express 2012; 20:26511-26520. [PMID: 23187506 PMCID: PMC3601595 DOI: 10.1364/oe.20.026511] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 10/25/2012] [Accepted: 10/31/2012] [Indexed: 05/27/2023]
Abstract
Barium titanate (BaTiO3) is a technologically important material because of its nonlinear properties, such as its strong second harmonic generation and high third order susceptibility. While many nonlinear effects have been extensively studied on the bulk scale, there are still questions regarding the strength of nonlinear effects in nanoparticles. The nonlinear properties of BaTiO3 nanoparticles and nanorods have been studied using the closed aperture z-scan technique. Silver was then grown photochemically on the surface of the BaTiO3 nanoparticles, and it was found that the third order susceptibility increases dramatically.
Collapse
Affiliation(s)
- Brian G Yust
- Department of Physics & Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA.
| | | | | | | | | | | |
Collapse
|
15
|
|
16
|
|
17
|
Pedraza F, Grandi F, Rocha NS. The need for cytologic/histologic correlation studies to establish a cytologic grading system for canine mast cell tumors in veterinary medicine. Vet Clin Pathol 2011; 40:280-1. [DOI: 10.1111/j.1939-165x.2011.00352.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
18
|
|
19
|
|
20
|
|
21
|
Nava H, Pedraza F, Alonso G. Nickel-Molybdenum-Tungsten Sulfide catalysts prepared by in situ activation of tri-metallic (Ni-Mo-W) alkylthiomolybdotungstates. Catal Letters 2005. [DOI: 10.1007/s10562-004-0777-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
22
|
Bokhimi X, Pedraza F. Characterization of brookite and a new corundum-like titania phase synthesized under hydrothermal conditions. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2004.04.021] [Citation(s) in RCA: 10] [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] [Indexed: 10/26/2022]
|
23
|
Blair MW, Pedraza F, Buendia HF, Gaitán-Solís E, Beebe SE, Gepts P, Tohme J. Development of a genome-wide anchored microsatellite map for common bean (Phaseolus vulgaris L.). Theor Appl Genet 2003; 107:1362-74. [PMID: 12677405 DOI: 10.1007/s00122-003-1398-6] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2003] [Accepted: 07/02/2003] [Indexed: 05/18/2023]
Abstract
A total of 150 microsatellite markers developed for common bean ( Phaseolus vulgaris L.) were tested for parental polymorphism and used to determine the positions of 100 genetic loci on an integrated genetic map of the species. The value of these single-copy markers was evident in their ability to link two existing RFLP-based genetic maps with a base map developed for the Mesoamerican x Andean population, DOR364 x G19833. Two types of microsatellites were mapped, based respectively on gene-coding and anonymous genomic-sequences. Gene-based microsatellites proved to be less polymorphic (46.3%) than anonymous genomic microsatellites (64.3%) between the parents of two inter-genepool crosses. The majority of the microsatellites produced single bands and detected single loci, however four of the gene-based and three of the genomic microsatellites produced consistent double or multiple banding patterns and detected more than one locus. Microsatellite loci were found on each of the 11 chromosomes of common bean, the number per chromosome ranging from 5 to 17 with an average of ten microsatellites each. Total map length for the base map was 1,720 cM and the average chromosome length was 156.4 cM, with an average distance between microsatellite loci of 19.5 cM. The development of new microsatellites from sequences in the Genbank database and the implication of these results for genetic mapping, quantitative trait locus analysis and marker-assisted selection in common bean are described.
Collapse
Affiliation(s)
- M W Blair
- CIAT-International Center for Tropical Agriculture, 1380 N.W. 78th Ave., Miami, Florida 33126, USA.
| | | | | | | | | | | | | |
Collapse
|
24
|
|
25
|
|
26
|
|
27
|
Guti�rrez A, L�pez MF, P�rez Trujillo FJ, Hierro MP, Pedraza F. Effects of Ce, Mo and Si ion implantation on the passive layer composition and high-temperature oxidation behaviour of AISI 304 stainless-steel studied by soft x-ray absorption spectroscopy. SURF INTERFACE ANAL 2000. [DOI: 10.1002/1096-9918(200008)30:1<130::aid-sia781>3.0.co;2-0] [Citation(s) in RCA: 11] [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] [Indexed: 11/09/2022]
|
28
|
|
29
|
Marcos MA, Abdalla S, Pedraza F, Andreu A, Fernandez F, Gomez-Lus R, Jimenez de Anta MT, Vila J. Epidemiological markers of Acinetobacter baumannii clinical isolates from a spinal cord injury unit. J Hosp Infect 1994; 28:39-48. [PMID: 7806867 DOI: 10.1016/0195-6701(94)90151-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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: 01/27/2023]
Abstract
During a period of 28 months, 114 isolates of Acinetobacter baumannii obtained from urine samples of 57 patients, were recovered in a Spinal Cord Unit; an unusual increase in the number of A. baumannii isolates was observed between February 1991 and January 1992. Six different typing methods [biotyping, antimicrobial susceptibility, whole cell and cell-envelope protein analysis, plasmid analysis and chromosomal DNA analysis by pulsed-field gel electrophoresis (PFGE)] were used to study the isolates to establish any potential relationships among them. Chromosomal DNA analysis by digestion with ApaI and separation of the fragments by PFGE was the most powerful tool to determine the relatedness of isolates. The results suggest that the isolates from 1991 and 1992 may have originated from strains present in 1990 that subsequently acquired resistance to amikacin and tobramycin during the epidemic.
Collapse
Affiliation(s)
- M A Marcos
- Departament de Microbiologia, Facultat de Medicina, Hospital Clinic, Universitat de Barcelona, Spain
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Pedraza F, Andreu A, Saune M, Moreno A, Ramírez L, García L. [A urinary outbreak of Acinetobacter baumanii in a spinal cord injury unit]. An Med Interna 1993; 10:55-8. [PMID: 8452972] [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] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
From January 1990 to April 1992, 114 urinary strains of Acinetobacter baumanii were isolated in 57 patients with traumatic spinal cord [correction of medular] injury. The strains were characterized by having all of them the same biochemical identification, except for citrate, maltose and tryptophan-desaminase. Until December 1990, (5 strains) were resistant to all antibiotics, except to tobramicine, amikacine, cotrimoxazol and imipenem (6.3%, 33.9%, 26.7% and 0% of resistances, respectively); since January 1991, (99 strains) became resistant to all of them, except to imipenem. 39.5% of AB were isolated in pure cultures, 46% of them with pyuria. Between February 1991 and January 1992, we observed the highest number of affected patients, although without seasonal predominance. We observed as well a higher incidence among males (46 males, 11 females). 80% of them carried a permanent probe. Only 6 patients presented clinical signs directly related to AB. The environmental study could not demonstrate any source of contagion or transmission mechanism.
Collapse
Affiliation(s)
- F Pedraza
- Servicio de Microbiología y Parasitología, Ciudad Sanitaria Universitaria Vall d'Hebron, Barcelona
| | | | | | | | | | | |
Collapse
|
31
|
Vázquez A, Pedraza F, Fuentes S. Influence of sulfidation on the morphology and hydrodesulfurization activity of palladium particles on silica. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0304-5102(92)80103-n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
32
|
Quirós C, Bresani F, Gonzales D, Pedraza F, Petrozzi A, Rubín de Celis E, Sotelo A, Vasi A, Velasco O, Zlatar M. [Social security services as a function of public health programs in Latin American countries]. An Fac Med Lima 1966; 49:259-278. [PMID: 5989499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|