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Raeisi H, Safarnejad MR, Alavi SM, de Oliveira Andrade M, Farrokhi N, Elahinia SA. Transient expression of anti-HrpE scFv antibody reduces the hypersensitive response in non-host plant against bacterial phytopathogen Xanthomonas citri subsp. citri. Sci Rep 2024; 14:7121. [PMID: 38531981 DOI: 10.1038/s41598-024-57355-w] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 03/18/2024] [Indexed: 03/28/2024] Open
Abstract
Citrus canker is a bacterial disease caused by Xanthomonas citri subsp. citri (Xcc) that affects the citrus industry worldwide. Hrp pili subunits (HrpE), an essential component of Type III secretion system (T3SS) bacteria, play a crucial role in the pathogenesis of Xcc by transporting effector proteins into the host cell and causing canker symptoms. Therefore, development of antibodies that block HrpE can suppress disease progression. In this study, a specific scFv detecting HrpE was developed using phage display technique and characterized using sequencing, ELISA, Western blotting, and molecular docking. In addition, a plant expression vector of pCAMBIA-scFvH6 was constructed and agroinfiltrated into Nicotiana tabacum cv. Samson leaves. The hypersensitive response (HR) in the leaves of transformed and non-transformed plants was evaluated by inoculating leaves with Xcc. After three rounds of biopanning of the phage library, a specific human scFv antibody, named scFvH6, was identified that showed high binding activity against HrpE in ELISA and Western blotting. Molecular docking results showed that five intermolecular hydrogen bonds are involved in HrpE-scFvH6 interaction, confirming the specificity and high binding activity of scFvH6. Successful transient expression of pCAMBIA-scFvH6 in tobacco leaves was verified using immunoassay tests. The binding activity of plant-produced scFvH6 to detect HrpE in Western blotting and ELISA was similar to that of bacterial-produced scFvH6 antibody. Interestingly, tobacco plants expressing scFvH6 showed a remarkable reduction in HR induced by Xcc compared with control plants, so that incidence of necrotic lesions was significantly higher in non-transformed controls (≥ 1.5 lesions/cm2) than in the plants producing scFvH6 (≤ 0.5 lesions/cm2) after infiltration with Xcc inoculum. Our results revealed that the expression of scFvH6 in tobacco leaves can confer resistance to Xcc, indicating that this approach could be considered to provide resistance to citrus bacterial canker disease.
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Affiliation(s)
- Hamideh Raeisi
- Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Shahid Arabi Ave., Yemen St., Velenjak, Tehran, Iran.
| | - Mohammad Reza Safarnejad
- Department of Plant Viruses, Agricultural Research Education and Extension Organization of Iran, Iranian Research Institute of Plant Protection, Tehran, Iran
| | - Seyed Mehdi Alavi
- Department of Plant Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Maxuel de Oliveira Andrade
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Naser Farrokhi
- Departement of Cell & Molecular Biology, Faculty of Life Sciences & Biotechnology, Shahid Beheshti University G.C, Evin, Tehran, Iran
| | - Seyed Ali Elahinia
- Department of Plant Protection, College of Agricultural Sciences, Guilan University, Rasht, Iran
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Hosseini A, Alavi SM, Bazyari A, Valaei A. Exploring the impact of competitive compounds and catalyst synthesis method in DBT oxidative desulfurization using MoO 3-V 2O 5/Al 2O 3 catalyst. Environ Sci Pollut Res Int 2024; 31:6332-6349. [PMID: 38147249 DOI: 10.1007/s11356-023-31580-8] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 12/12/2023] [Indexed: 12/27/2023]
Abstract
This research endeavors to address the pressing challenge of reducing sulfur content in fuels, an environmental imperative. It does so by employing bimetallic catalysts to enhance the efficiency of oxidative desulfurization (ODS) processes. This involves utilizing successive impregnation and co-impregnation methods to prepare a MoO3-V2O5/Al2O3. The catalysts underwent characterization using various techniques including X-ray diffraction (XRD), N2 adsorption-desorption, UV-vis (DRS), temperature-programmed desorption (NH3-TPD), Raman, Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and energy dispersive spectrum (EDS). The catalyst was utilized for the evaluation of the ODS process of dibenzothiophene (DBT). The effects of oxidants, namely H2O2 and t-butyl hydroperoxide (TBHP), were studied in the ODS. The catalyst prepared using the co-impregnation method (5M-15V-co) demonstrated significant acidic sites and exhibited remarkable efficiency in oxidative desulfurization. Remarkably, this catalyst achieved 100% oxidation of sulfur components within 30 min (min). To assess the catalyst's performance further, competitive compounds including nitrogen-containing compounds (NCCs) and saturated and unsaturated hydrocarbon compounds (HCs) were employed in the ODS. Initially, the introduction of NCCs led to a decrease in the sulfur removal rate; however, the catalyst successfully oxidized DBT completely within 60 min. When cyclohexene was present as an olefinic hydrocarbon compound, the catalyst oxidized DBT by approximately 75%, whereas DBT oxidation reached 100% within 20 min when p-xylene was introduced to the catalytic reactor. Additionally, as the O/S ratio increased from 2/5 to 10, the sulfur removal rate improved from 30 to 90%, indicating that HCs and NCCs compete with sulfur in terms of oxidant consumption.
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Affiliation(s)
- Alireza Hosseini
- Catalyst and Nano Material Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Seyed Mehdi Alavi
- Catalyst and Nano Material Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran.
| | - Amin Bazyari
- Catalyst and Nano Material Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Akbar Valaei
- Catalyst and Nano Material Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran
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Ahmadi M, Alavi SM, Larimi A. Pt-Cu@Bi 2MoO 6/TiO 2 Photocatalyst for CO 2 Reduction. Inorg Chem 2023. [PMID: 37996778 DOI: 10.1021/acs.inorgchem.3c03372] [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: 11/25/2023]
Abstract
Bi2MoO6/TiO2 heterojunction photocatalysts were constructed by depositing Bi2MoO6 nanosheets on TiO2 nanobelts' surface using a solvothermal method, and the surface of the optimum Bi2MoO6/TiO2 composite was decorated with copper and/or platinum nanoparticles. The synthesized samples were investigated for the CO2 photocatalytic reduction. The structural and optical properties of synthesized photocatalysts were characterized by XRD, FESEM, EDX, N2-physisorption, Raman, TPD-CO2, DRS, and PL analysis. The Bi2MoO6/TiO2 composite with different molar ratios of Bi2MoO6 to TiO2 (1, 1/2, 1/3, 1/4, 1/5, and 1/6) showed enhanced photocatalytic activity compared to pure Bi2MoO6 and TiO2. In comparison to bulk Bi2MoO6 and TiO2, the formation of a heterojunction between Bi2MoO6 and TiO2 leads to enhanced CO2 adsorption capacity. The enhanced performance of composites can be ascribed to the improved efficiency of light harvesting in the visible light range and suppressing charge recombination. The composite photocatalytic activity indicated that the ratio of Bi2MoO6 to TiO2 in the composite samples influenced the photocatalytic performance. The Bi2MoO6/TiO2 composite with 1/4 molar ratio had the best performance in 8 h (36.4 μmol/gcat), which was about 10 and 3 times higher than TiO2 and Bi2MoO6 photocatalysts, respectively. Under UV-visible light irradiation, the Pt-Cu@BMT4 sample produced the highest amount of methane (83.6 μmol/gcat) during CO2 photoreduction. During four irradiation cycles, the Pt-Cu@BMT4 sample exhibited superior stability with less than 5% decrease in methane production.
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Affiliation(s)
- Maryam Ahmadi
- Catalyst and Nanomaterials Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
| | - Seyed Mehdi Alavi
- Catalyst and Nanomaterials Research Laboratory (CNMRL), School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
| | - Afsanehsadat Larimi
- Department of Chemical and Process Engineering, Niroo Research Institute, Tehran 14686-13113, Iran
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Malekzadeh Gonabadi N, Shamsara M, Kordi Tamandani DM, Shojaei S, Alavi SM. Different Effects of Low-Level Laser Therapy on the Proliferation of HT29 Cells in Culture and Xenograft Models. J Lasers Med Sci 2023; 14:e31. [PMID: 37744016 PMCID: PMC10517571 DOI: 10.34172/jlms.2023.31] [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: 05/15/2023] [Accepted: 07/09/2023] [Indexed: 09/26/2023]
Abstract
Introduction: Different kinds of treatments have been developed to fight cancers. Low-level laser therapy (LLLT), also known as photobiomodulation therapy (PBMT), is a low-power monochromatic and coherent light that has been used successfully for healing injuries and combating malignancies. However, there are concerns about the application of LLLT to cancers due to the increased proliferation of some cancer cells after LLLT. Methods: This study investigated the effects of 650 nm and 870 nm lasers on the proliferation of HT29 colorectal cancer cell lines in vitro and in vivo. Results: The results showed that the laser with a wavelength of 870 nm did not meaningfully alter the proliferation of cultured cells. However, cell proliferation was promoted when the laser was applied within a wavelength of 650 nm. Treatment of HT29-derived tumors in nude mice with the 650 nm laser resulted in the decline of the tumor progression rate compared to controls. This result was inconsistent with the proliferative effects of the laser on the cultured cells. Conclusion: Cell behavior in response to LLLT might be different between cell culture and xenograft models.
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Affiliation(s)
| | - Mehdi Shamsara
- Department of Animal Biotechnology, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | | | - Sahar Shojaei
- Middle East Gene and Cell Therapy Company, Tehran, Iran
| | - Seyed Mehdi Alavi
- Department of Plant Biotechnology, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
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Babakouhi R, Alavi SM, Rezaei M, Akbari E, Varbar M. Combined CO2 reforming and partial oxidation of methane over mesoporous nanostructured Ni/M-Al2O3 catalyst: Effect of various support promoters and nickel loadings. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2023.102427] [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: 02/11/2023]
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Sabokmalek S, Alavi SM, Rezaei M, Akbari E. Hydrogen Production by Glycerol Steam Reforming on the Ni/CaO-Al2O3 Catalysts: The Study of Synergistic Effect Between CaO and Al2O3. Catal Letters 2023. [DOI: 10.1007/s10562-022-04247-1] [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: 01/06/2023]
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Pourdelan H, Alavi SM, Rezaei M, Akbari E. Thermocatalytic Decomposition of Methane Over NiO–MgO Catalysts Synthesized by the Mechanochemical Method. Catal Letters 2022. [DOI: 10.1007/s10562-022-04175-0] [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: 11/13/2022]
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Mirasgari M, Alavi SM, Rezaei M. Effects of partial substitution of Cu by Mn and Co in LaCu0.5Ni0.5O3 catalyst synthesized by mechanochemical method in the total oxidation of methane. Res Chem Intermed 2022. [DOI: 10.1007/s11164-022-04775-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Ahadzadeh M, Alavi SM, Rezaei M, Akbari E. Propane dry reforming over highly active NiO-MgO solid solution catalyst for synthesis gas production. Molecular Catalysis 2022. [DOI: 10.1016/j.mcat.2022.112325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Shafiee P, Alavi SM, Rezaei M. Investigation of the effect of cobalt on the Ni–Al2O3 catalyst prepared by the mechanochemical method for CO2 methanation. Res Chem Intermed 2022. [DOI: 10.1007/s11164-022-04700-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Darvishi N, Alavi SM, Hijazi M. CRISPR- mediated Mutation in Cinnamoyl- CoA Reductase 4 in Allohexaploid Oilseed Crop Camelina sativa, Revealed its Pivotal Role in Resistance Against Sclerotinia sclerotiorum. Iran J Biotechnol 2021; 19:e2768. [PMID: 35350644 PMCID: PMC8926321 DOI: 10.30498/ijb.2021.230722.2768] [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] [Indexed: 11/25/2022]
Abstract
BACKGROUND Sclerotinia sclerotiorum (Ss) is a broad host range necrotrophic ascomycete fungus affecting over 400 plant species. Ss causes stem rot disease on Camelina sativa (Cs) an allohexaploid crucifer species that is promoted as a low input crop and industrial oil attributes suitable as biofuel and lubricant. Histochemical and molecular studies has linked resistance to Ss in C. sativa with the cell wall lignification (Eynck et al., 2012) and reported constitutive expression of Cinnamoyl-CoA Reductase 4 (CsCCR4) gene, in the Cs resistant line CN114263. Modern breeding efforts, such as gene editing, are needed to improve commercial lines and to limit the risk of crop loss which would be substantial to producers. OBJECTIVES To investigate the importance of monolignol biosynthesis and the role of CsCCR4 in Camelina resistance to Ss we generated CsCCR4 knockout mutants of CN114263 Camelina line using CRISPR/Cas9-mediated gene editing. MATERIALS AND METHODS Thirty T1 plants were produced via floral dip transformation followed by glyphosate spraying that was used in the first step of screening procedures and were confirmed by PCR method. Transgene's T-DNA copy number variation, T-DNA CNV, in T1 and T2 progenitors were determined using digital droplet PCR (ddPCR) and the occurrence of mutation in the three copies of CsCCR4 homeologues in T1 and T2 generations were scrutinized by drop-off assay technique. To make sure that if the created mutants in T2 plants are real, TOPO TA sequencing flanking the Cas9/gRNA specific hot point of cleavage for three of them was conducted. RESULTS In the T1 generation, 25 plants were confirmed which had between one to nine T-DNA copies in the corresponding Camelina genome. In T2 generation the population were screened for potential mutation in CsCCR4 gene. Various types of mutations, including insertions and deletions, were demonstrated in three copies of CsCCR4. In fact, CRISPR system could have cut one, two or three copies of the gene in events numbered T2-plant 10, T2-plant 15 and T2-plant 19, respectively. The T3-plant 19 which showed mutation in all versions of CsCCR4 in previous generation had susceptibility to S. sclerotiorum invasion and was kept as real csccr4 mutant material for further investigations of Camelina-Sclerotinia interaction. Mutation in CsCCR4 had occurred through error-prone none- homologous end joining (NHEJ) nucleus DNA repair pathway. Ss challenge on the early flowering T3 generation. The T3 plants with mutation causing premature stop codon at position 217 of CsCCR4 were compromised in their resistance to Ss compared to the wildtype resistant control parent CN114263. CONCLUSION Using ddPCR it easily was possible to identify both the T-DNA CNV and occurrence of mutation in CsCCR4 homeologues in T1 and T2 progenitors. We illustrated that CRISPR/Cas9-mediated mutation is a decent technique that can be utilized to expedite the mutant line development which could assist to figure out the activity of a CsCCR4 gene in defense responses to the pathogens in C. sativa as prospective oilseed crop for biodiesel production.
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Affiliation(s)
- Naser Darvishi
- Department of Plant Molecular Biotechnology, Institute of Agricultural Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran ,
Department of Agriculture and Agri-Food Canada, Saskatoon Research and Development Centre, 107 Science Place, Saskatoon, SK. S7N 0X2, Canada
| | - Seyed Mehdi Alavi
- Department of Plant Molecular Biotechnology, Institute of Agricultural Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - May Hijazi
- Department of Agriculture and Agri-Food Canada, Saskatoon Research and Development Centre, 107 Science Place, Saskatoon, SK. S7N 0X2, Canada
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Affiliation(s)
- Ehsan Akbari
- School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran 1311416846, Iran
| | - Seyed Mehdi Alavi
- School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran 1311416846, Iran
| | - Mehran Rezaei
- School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran 1311416846, Iran
| | - Afsanehsadat Larimi
- Department of Chemical and Process Engineering, Niroo Research Institute, Tehran 1468613113, Iran
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Ansari S, Mousavi A, Safarnejad MR, Farrokhi N, Alavi SM, Schillberg S, Nölke G. Selection and characterization of two monoclonal antibodies specific for the Aspergillus flavus major antigenic cell wall protein Aflmp1. Fungal Biol 2021; 125:621-629. [PMID: 34281655 DOI: 10.1016/j.funbio.2021.03.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 10/14/2020] [Revised: 02/03/2021] [Accepted: 03/24/2021] [Indexed: 10/21/2022]
Abstract
Aspergillus flavus is a major fungal pathogen of plants and an opportunistic pathogen of humans. In addition to the direct impact of infection, it produces immunosuppressive and carcinogenic aflatoxins. The early detection of A. flavus is therefore necessary to diagnose and monitor fungal infection, to prevent aflatoxin contamination of food and feed, and for effective antifungal therapy. Aspergillus-specific monoclonal antibodies (mAbs) are promising as diagnostic and therapeutic reagents for the tracking and treatment of Aspergillus infections, respectively. However, A. flavus has a complex cell wall composition and dynamic morphology, hindering the discovery of mAbs with well-characterized targets. Here we describe the generation and detailed characterization of mAb5.52 (IgG2aκ) and mAb17.15 (IgG1κ), which bind specifically to the highly immunogenic cell wall antigen A. flavus mannoprotein 1 (Aflmp1). Both mAbs were generated using hybridoma technology following the immunization of mice with a recombinant truncated version of Aflmp1 (ExD, including the homologous CR4 domain) produced in bacteria. We show that mAb5.52 and mAb17.15 bind specifically to A. flavus and A. parasiticus cell wall fragments (CWFs), with no cross-reaction to CWFs from other fungal pathogens. Immunofluorescence microscopy revealed that both mAbs bind to the surface of Aspergillus hyphae and that mAb17.15 also binds to spores. The epitope for both mAbs is localized within the CR4 region of the Aflmp1 protein. These Aspergillus-specific mAbs may be useful for the early detection of fungal infection in food/feed crops, for serodiagnosis in patients with invasive aspergillosis caused by A. flavus infection and for the development of antibody-expressing disease-resistant crops.
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Affiliation(s)
- Saeede Ansari
- Department of Plant Molecular Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran; Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Forckenbeckstrasse 6, 52074 Aachen, Germany
| | - Amir Mousavi
- Department of Plant Molecular Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran.
| | - Mohammad Reza Safarnejad
- Department of Plant Viruses, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
| | - Naser Farrokhi
- Department of Cell & Molecular Biology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Seyed Mehdi Alavi
- Department of Plant Molecular Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Stefan Schillberg
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Forckenbeckstrasse 6, 52074 Aachen, Germany
| | - Greta Nölke
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Forckenbeckstrasse 6, 52074 Aachen, Germany.
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Farahani SH, Falamaki C, Alavi SM. Kinetic modeling of the ethylbenzene/xylene isomerization reaction over HZSM‐5 zeolites revisited. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21356] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Cavus Falamaki
- Chemical Engineering Department Amirkabir University of Technology Tehran, Iran
| | - Seyed Mehdi Alavi
- Chemical Engineering Department Iran University of Science and Technology Tehran, Iran
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Nekoeian S, Aghajani M, Alavi SM, Sotoudeh F. Effect of surfactants on mass transfer coefficients in bubble column contactors: an interpretative critical review study. REV CHEM ENG 2019. [DOI: 10.1515/revce-2018-0089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Since surfactants have been recognized as the most frequently faced contaminants of bubble column-related processes over time, their impact on the mass transfer operation of these columns has become a demanding research interest for two recent decades. Despite the similarities expressing the overall negative and positive influence of these chemicals on mass transfer coefficients and specific interfacial area, respectively, the discrepancies and, sometimes, paradoxical results are still under debate in the literature. To make a more comprehensive recognition of the mentioned subject, the current paper has tried to pave the path by reviewing all the major methods utilized in related research works. Thereafter, an interpretative argumentative comparison of the main findings of relevant studies has also been proposed, enlightening some of the research gaps which can be the potential candidates for future studies.
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Affiliation(s)
- Sahand Nekoeian
- Department of Gas Engineering , Petroleum University of Technology , Ahwaz , Iran , e-mail:
| | - Masoud Aghajani
- Department of Gas Engineering , Petroleum University of Technology , Ahwaz , Iran
| | - Seyed Mehdi Alavi
- Department of Chemical Engineering , Iran University of Science and Technology , Tehran , Iran
| | - Fatemeh Sotoudeh
- Department of Gas Engineering , Petroleum University of Technology , Ahwaz , Iran
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Farahani SH, Alavi SM, Falamaki C. Improved performance of HZSM-5 for the ethylbenzene/xylene isomerization reaction under industrial operating conditions. RSC Adv 2017. [DOI: 10.1039/c7ra05924h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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] Open
Abstract
A specific one-step mild dealumination of ZSM-5 is reported that increases significantly para xylene selectivity and ethyl benzene conversion in the xylene isomerization reaction of xylene mixtures/ethyl benzene feeds at industrial conditions.
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Affiliation(s)
| | - Seyed Mehdi Alavi
- Chemical Engineering Department
- Iran University of Science Technology
- Tehran
- Iran
| | - Cavus Falamaki
- Chemical Engineering Department
- Amirkabir University of Technology
- Tehran
- Iran
- Petrochemical Center of Excellence
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Mazloom G, Alavi SM. Different catalytic reactor technologies in selective oxidation of propane to acrylic acid and acrolein. Particulate Science and Technology 2016. [DOI: 10.1080/02726351.2016.1209264] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Golshan Mazloom
- Department of Chemical Engineering, Faculty of Engineering, University of Mazandaran, Babolsar, Iran
| | - Seyed Mehdi Alavi
- Reaction Engineering Lab., Chemical Engineering Department, Iran University of Science and Technology, Tehran, Iran
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Gholami D, Goodarzi T, Aminzadeh S, Alavi SM, Kazemipour N, Farrokhi N. Bacterial Secretome Analysis in Hunt for Novel Bacteriocins with Ability to Control Xanthomonas citri subsp. Citri. Iran J Biotechnol 2015; 13:10-19. [PMID: 28959294 PMCID: PMC5435018 DOI: 10.15171/ijb.1123] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 06/27/2015] [Accepted: 08/27/2015] [Indexed: 11/09/2022]
Abstract
BACKGROUND Xanthomonas citri subsp. citri (Xcc), the causative agent of bacterial citrus canker, has affected citriculture worldwide. Varieties of means have been used to minimize its devastating effects, but no attention has been given to bacteriocins. OBJECTIVES Here and for the first time, we report the isolation and characterization of two novel bacteriocins. MATERIALS AND METHODS Secretome containing bacteriocins of isolated bacteria was separated via SDS-PAGE. Each isolated protein band was characterized and checked for its efficacy in controlling two pathogenic isolates of Xcc via disk diffusion assay. The effects of varieties of carbon, nitrogen and phosphate sources were evaluated on both bacterial growth and bacteriocin production via Taguchi orthogonal method. RESULTS The two bacteriocins showed an activity up to 55ºC that were sensitive to proteases suggesting being protein in nature. Analysis of SDS-PAGE purified protein bands of bacterial secretomes with demonstrated potency against Xcc revealed the presence of peptides with relative molecular masses of 16.9 and 17 kDa for Cronobacter and Enterobacter, respectively. Sequence analysis of peptides revealed an HCP1 family VI secretion system homologue for Cronobacter (YP_001439956) and pilin FimA homologue for Enterobacter (CBK85798.1). A Taguchi orthogonal array was also implemented to determine the effect of temperature and eight other chemical factors on bacteriocin production for each bacterium. CONCLUSIONS Two peptides with novel antibacterial activities effective against Xcc were isolated, characterized and conditions were optimized for their higher production.
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Affiliation(s)
- Dariush Gholami
- Department of Bioprocess Engineering, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
- Science Department, Sistan-Baluchistan University, Zahedan, Iran
| | - Tannaz Goodarzi
- Department of Bioprocess Engineering, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | - Saeed Aminzadeh
- Department of Bioprocess Engineering, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | - Seyed Mehdi Alavi
- Department of Bioprocess Engineering, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran
| | | | - Naser Farrokhi
- Department of Biotechnology, Faculty of New Technologies and Energy Engineering, Shahid Beheshti University, Tehran, Iran
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Mazloom G, Alavi SM. Partial Oxidation of Propane Over Mo1V0.3Te0.23Nb0.12OxCatalyst in a Fluidized Bed Reactor. Particulate Science and Technology 2014. [DOI: 10.1080/02726351.2014.948978] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ezzati-Tabrizi R, Farrokhi N, Talaei-Hassanloui R, Alavi SM, Hosseininaveh V. Insect inducible antimicrobial peptides and their applications. Curr Protein Pept Sci 2013; 14:698-710. [PMID: 24106966] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2012] [Revised: 09/03/2013] [Accepted: 09/04/2013] [Indexed: 06/02/2023]
Abstract
Antimicrobial peptides (AMPs) are found as important components of the innate immune system (host defense) of all invertebrates. These peptides can be constitutively expressed or induced in response to microbial infections. Indeed, they vary in their amino acid sequences, potency and antimicrobial activity spectra. The smaller AMPs act greatly by disrupting the structure or function of microbial cell membranes. Here, the insect innate immune system with emphasis on inducible antimicrobial peptide properties against microbial invaders has been discussed.
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Ezzati-Tabrizi R, Farrokhi N, Talaei-Hassanloui R, Alavi SM, Hosseininaveh V. Insect Inducible Antimicrobial Peptides and Their Applications. Curr Protein Pept Sci 2013. [DOI: 10.2174/1389203711209070620] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Mazloom G, Alavi SM. Kinetic study of selective propane oxidation to acrylic acid over Mo1V0.3Te0.23Nb0.12Ox using the genetic algorithm. Reac Kinet Mech Cat 2013. [DOI: 10.1007/s11144-013-0607-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Alavi SM, Ahmadi BB, Baharestani B, Babaei T. Comparison of the effects of gelatin, Ringer's solution and a modern hydroxyl ethyl starch solution after coronary artery bypass graft surgery. Cardiovasc J Afr 2013; 23:428-31. [PMID: 23044498 PMCID: PMC3721804 DOI: 10.5830/cvja-2012-026] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2010] [Accepted: 03/13/2012] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE The aim of this study was to compare the effect of 6% hydroxyl ethyl starch solution with 4% gelatin and Ringer's solutions on the haemodynamic stability of patients after coronary artery bypass graft (CABG) surgery and immediately after discontinuation of cardiopulmonary bypass (CPB). METHODS This was a randomised, double-blind clinical trial of 92 patients who were candidates for on-pump CABG. After discontinuation of CPB, all patients were transferred to the intensive care unit (ICU) and divided randomly into three groups. The first group received Ringer's solution, the second group 4% gelatin, and the third 6% hydroxyl ethyl starch (HES) solution (Voluven). Haemodynamic parameters such as heart rate, mean arterial pressure, systolic blood pressure, diastolic blood pressure, central venous pressure, cardiac output and the presence of arrhythmias were documented. RESULTS The volume needed for maintaining normal blood pressure and central venous pressure in the range of 10-14 mmHg was less in the HES group than in the other groups. The volume was similar however in the gelatin and Ringer's groups in the first 24 hours after surgery. Urinary output in the first four and 24 hours after surgery were significantly higher in the HES group than in the other two groups. Mean creatinine levels were significantly lower in the HES group. CONCLUSION HES (6%) had a better volume-expanding effect than gelatin (4%) and Ringer's solutions, and its short-term effects on renal function were also better than gelatin and Ringer's solutions.
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Affiliation(s)
- S M Alavi
- Department of Anaesthesiology and Intensive Care Medicine, Rajaei Heart Centre, Tehran University of Medical Sciences, Tehran, Iran
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Kafil M, Bandani AR, Kaltenpoth M, Goldansaz SH, Alavi SM. Role of symbiotic bacteria in the growth and development of the Sunn pest, Eurygaster integriceps. J Insect Sci 2013; 13:99. [PMID: 24205987 PMCID: PMC3835049 DOI: 10.1673/031.013.9901] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 04/12/2012] [Indexed: 05/10/2023]
Abstract
The Sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), is the most important pest of wheat and barley in wide areas of the world. Different aspects of the insect's life history have been studied, but to date nothing is known about their microbial symbionts. Here, the contribution of symbiotic bacteria to the fitness of the bug was investigated by combining two different approaches to manipulate the host's microbial community: the supplementation of antibiotics into the insects' diet and egg surface sterilization. First, bacteria cultured from gut homogenates were subjected to antibiotic screening tests using 20 different antibiotics. Norfloxacin was the most effective antibiotic, with the greatest inhibition zone among all antibiotics tested. Feeding norfloxacin to adult E. integriceps individuals significantly impaired growth and development of the offspring in a dose-dependent manner, i.e., higher antibiotic doses increased the negative effects on nymphal growth and development. Total developmental time from first nymphal instars to adult emergence in control animals was 30.1 days, but when adults had been offered diets with 10, 20, and 30 µg antibiotic per mg diet, the offspring's developmental time was prolonged to 32.8, 34.0, and 34.8 days, respectively. In the highest two doses of norfloxacin, all of the nymphs died before reaching the fifth nymphal instar. Similar results as for the antibiotic treatment were obtained when egg surface sterilization was used to manipulate the microbial community of E. integriceps. These results indicate that bacterial symbionts play a crucial role in the successful development of the host.
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Affiliation(s)
- Maryam Kafil
- Department of Plant Protection, University of Tehran, Karaj, Iran
| | - Ali Reza Bandani
- Department of Plant Protection, University of Tehran, Karaj, Iran
| | - Martin Kaltenpoth
- Max Planck Institute for Chemical Ecology, Insect Symbiosis Research Group, Hans-Knoell-Str. 8, 07745 Jena, Germany
| | | | - Seyed Mehdi Alavi
- Department of Plant Biotechnology, National Institute for Genetic Engineering and Biotechnology (NIGEB), P.O.Box: 14155-6343, Tehran, Iran
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Modarresi M, Nematzadeh GA, Moradian F, Alavi SM. Identification and cloning of the Cu/Zn superoxide dismutase gene from halophyte plant Aeluropus littoralis. Genetika 2012; 48:130-134. [PMID: 22567863] [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: 05/31/2023]
Abstract
Reactive oxygen species (ROS) derived from molecular oxygen under biotic and abiotic stress such as salinity which have deleterious effects on cell metabolism. The toxic effect of ROS counteract by enzymatic as well as non-enzymatic antioxidant system. Superoxide dismutase (SOD) has a potential role for elimination of ROS. Halophytes respond to salt stress at different levels and can be a model for increasing salt tolerance in crop plants. Thus salt tolerance gene isolation and cloning of gene as well as subsequent transformation are first step for sensitive crop improvement. Aeluropus littoralis is a halophyte plant from poaceae family can be as a beneficial plant with high potential for creal breeding. There was no report on isolation of SOD gene from A. littoralis and little genomic study of this plant carried out. In this study a novel gene from A. littoralis isolated. This gene amplified by reverse transcription-PCR and cloned in E. coli pTZ57R/T cloning vector. The AlSOD gene sequence contained 456 bp and the deduced transcripts encoding 152 amino acids shared a high homology with those putative CuZnSOD of higher plants like Zea mays and Oryza sativa.
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Affiliation(s)
- M Modarresi
- Rice & Citrus Research Institute, Sari Agricultural Sciences and Natural Resources University, P.O. Box 578, Sari, I.R. Iran.
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Dehkordy AB, Rafiei A, Alavi SM, Latifi SM. Prevalence of cryptosporidium infection in immunocompromised patients, in South-west of iran, 2009-10. Iran J Parasitol 2010; 5:42-7. [PMID: 22347265 PMCID: PMC3279856] [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] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Accepted: 10/11/2010] [Indexed: 11/28/2022]
Abstract
BACKGROUND Cryptosporidium is a protozoan parasite with worldwide distribution. The aim of this study was to estimate the prevalence of Cryptosporidium infection by antigen detection in faeces among immunocompromised patients referred to educational hospitals of Ahvaz City, South-West of Iran, 2009-2010. METHODS Fecal samples from 176 immunocompromised patients were collected and Cryptosporidium coproantigen test was performed using ELISA method (DRG kit, Germany). A questionnaire was completed for each case and the results were analyzed using descriptive and Chi-Square tests, by SPSS statistical software (15(th) version). RESULTS Our study indicated 5.1% Cryptosporidium infection prevalence in the immunocompromised participated population. Furthermore, 4.2 %, 4 %, 4.5 % and 9.1 % infection rates were identified in children suffered from hematopoietic malignancy, adult cancer patients, renal transplant recipients, and HIV(+) cases, respectively. There was not significant correlation between the infection and age and gender (P>0.05). Infection was most frequent among HIV(+) patients. CONCLUSION The present study confirmed the high prevalence of Cryptosporidium antigen in fecal samples of immunocompromised patients in the region. As no chemotherapeutic agents have yet proven, especially in immunosuppressed patients, therefore our results highlight the importance of preventive intervention in these groups.
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Affiliation(s)
- A Balouty Dehkordy
- Department of Myco-parasitology, Faculty of Medicine, Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - A Rafiei
- Department of Myco-parasitology, Faculty of Medicine, Jundishapur University of Medical Sciences, Ahvaz, Iran,Infectious Diseases and Tropical Medicine Research Center, Faculty of Medicine, Jundishapur University of Medical Sciences, Ahvaz, Iran,Corresponding author: Fax: 0611-3331544,. rafieiabdollah@ yahoo.com
| | - SM Alavi
- Infectious Diseases and Tropical Medicine Research Center, Faculty of Medicine, Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - SM Latifi
- Statistic and Epidemiology Department, Faculty of Public Health, Jundishapur University of Medical Sciences, Ahvaz, Iran
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Alavi SM, Poussier S, Manceau C. Characterization of ISXax1, a novel insertion sequence restricted to Xanthomonas axonopodis pv. phaseoli (variants fuscans and non-fuscans) and Xanthomonas axonopodis pv. vesicatoria. Appl Environ Microbiol 2007; 73:1678-82. [PMID: 17209062 PMCID: PMC1828756 DOI: 10.1128/aem.02031-06] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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: 11/20/2022] Open
Abstract
ISXax1 is a novel insertion sequence belonging to the IS256 and Mutator families. Dot blot, Southern blot, and PCR analyses revealed that ISXax1 is restricted to Xanthomonas axonopodis pv. phaseoli (variants fuscans and non-fuscans) and X. axonopodis pv. vesicatoria strains. Directed AFLP also showed that a high degree of polymorphism is associated with ISXax1 insertion in these strains.
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Affiliation(s)
- Seyed Mehdi Alavi
- UMR PaVé, centre INRA, 42 rue Georges Morel, 49071 Beaucouzé Cedex 1, France
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Fazaeli H, Abbasi A, Alavi SM. Effect of diets containing alfalfa seed screenings on performance of layer hens. Br Poult Sci 1999; 40 Suppl:S28. [PMID: 10661426 DOI: 10.1080/00071669986666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- H Fazaeli
- Animal Science Research Institute, Karaj, Iran
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Abstract
The isolated, vagally innervated antral pouches in anesthetized dogs were irrigated with 095% acetylcholine chloride (Ach) or a 0.4 M mixture of non-essential amino acids (AA), or distended at 30 cm H2O pressure. In addition,2-deoxy-D-glucose (2-DG) was administered intravenously. Significant increases in antral venous gastrin, caused by gastrin releasers, were associated with a significant rise in cAMP content in the antral mucosa. Acidification of the antrum with simultaneous administration of 2-DG, and acidified AA abolished gastrin release, and significantly reduced mucosal cAMP. Acidified Ach and distension of the antrum with 0.1 N HC1 supressed gastrin levels without significantly changing the mucosal cAMP content. Since the augmented gastrin release was accompanied by an increased mucosal cAMP, the results suggest that cAMP participates in the action of gastrin secretagogues.
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Alavi SM, Keats TE, O'Brien WM. The angle of tracheal bifurcation: its normal mensuration. Am J Roentgenol Radium Ther Nucl Med 1970; 108:546-9. [PMID: 5415930 DOI: 10.2214/ajr.108.3.546] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Alavi SM, Keats TE. Operative cholangiography in diagnosis of intrahepatic abscess: presentation of a case. J Can Assoc Radiol 1969; 20:253-4. [PMID: 5364093] [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: 01/14/2023]
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