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Ljungberg Persson C, Al-Nuaimi A, Esmaeili N, Svensberg K. Patients' attitudes towards using a question prompt list in community pharmacies. Patient Educ Couns 2023; 115:107862. [PMID: 37422951 DOI: 10.1016/j.pec.2023.107862] [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: 02/01/2023] [Revised: 05/28/2023] [Accepted: 06/17/2023] [Indexed: 07/11/2023]
Abstract
OBJECTIVE To explore patients' usage rate and perceived usefulness and benefits of a question prompt list (QPL) when collecting prescribed medication in community pharmacies. METHODS Data were collected in Swedish pharmacies using questionnaires and semi-structured interviews with patients. The Technology Acceptance Model (TAM) was used, and the outcomes were usage rate, factors impacting on use, and perceived ease of use, usefulness, and benefits of self-reported question-asking and self-perceived medication knowledge. Descriptive statistics and group comparisons were performed, and qualitative data were analyzed thematically with the TAM. RESULTS Out of 145 patients filling out the questionnaire, 72 (50.0%) reported they had used the QPL. Patients with new prescriptions and non-native Swedish speakers used the QPL more often (p = 0.03; p = 0.009, respectively). The QPL was quick to read (86.3%) and easy to understand (91.4%). Forty percent stated that they asked more questions, and self-reported users scored higher on self-perceived medication knowledge. In the interviews (n = 14), the QPL was described as an eye-opener as to what one could ask the pharmacist. CONCLUSIONS Patients were willing to use a QPL in community pharmacies. PRACTICE IMPLICATIONS A QPL in pharmacies might improve patients' engagement medication knowledge, as well as showcase the expertise of pharmacists.
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Affiliation(s)
- C Ljungberg Persson
- School of Public Health and Community Medicine, University of Gothenburg, Gothenburg, Sweden.
| | - A Al-Nuaimi
- Department of Pharmacy, University of Uppsala, Box 580, 751 23 Uppsala, Sweden
| | - N Esmaeili
- School of Public Health and Community Medicine, University of Gothenburg, Gothenburg, Sweden
| | - K Svensberg
- Department of Pharmacy, University of Uppsala, Box 580, 751 23 Uppsala, Sweden
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2
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Balasubramaniam T, Shen G, Esmaeili N, Zhang H. Plants' Response Mechanisms to Salinity Stress. Plants (Basel) 2023; 12:2253. [PMID: 37375879 DOI: 10.3390/plants12122253] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/29/2023] [Accepted: 05/31/2023] [Indexed: 06/29/2023]
Abstract
Soil salinization is a severe abiotic stress that negatively affects plant growth and development, leading to physiological abnormalities and ultimately threatening global food security. The condition arises from excessive salt accumulation in the soil, primarily due to anthropogenic activities such as irrigation, improper land uses, and overfertilization. The presence of Na⁺, Cl-, and other related ions in the soil above normal levels can disrupt plant cellular functions and lead to alterations in essential metabolic processes such as seed germination and photosynthesis, causing severe damage to plant tissues and even plant death in the worst circumstances. To counteract the effects of salt stress, plants have developed various mechanisms, including modulating ion homeostasis, ion compartmentalization and export, and the biosynthesis of osmoprotectants. Recent advances in genomic and proteomic technologies have enabled the identification of genes and proteins involved in plant salt-tolerance mechanisms. This review provides a short overview of the impact of salinity stress on plants and the underlying mechanisms of salt-stress tolerance, particularly the functions of salt-stress-responsive genes associated with these mechanisms. This review aims at summarizing recent advances in our understanding of salt-stress tolerance mechanisms, providing the key background knowledge for improving crops' salt tolerance, which could contribute to the yield and quality enhancement in major crops grown under saline conditions or in arid and semiarid regions of the world.
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Affiliation(s)
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
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3
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Atabaki R, Khaleghzadeh-Ahangar H, Esmaeili N, Mohseni-Moghaddam P. Role of Pyroptosis, a Pro-inflammatory Programmed Cell Death, in Epilepsy. Cell Mol Neurobiol 2023; 43:1049-1059. [PMID: 35835968 DOI: 10.1007/s10571-022-01250-3] [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: 04/13/2022] [Accepted: 06/25/2022] [Indexed: 11/27/2022]
Abstract
Epilepsy is one of the most common serious brain diseases worldwide. Programmed cell death (PCD), a cellular self-destruction phenomenon, has been greatly documented in neurodegenerative diseases. Pyroptosis is a well-known pro-inflammatory PCD, and its involvement in epilepsy has been reported in animal models of epilepsy and also epileptic patients. Canonical (caspase-1-dependent) and non-canonical (caspase-1-independent) pathways are two main mechanisms implicated in pyroptotic cell death. Mouse caspase-11 or human analogues caspase-4/5 induce the non-canonical pathway. In both pathways, membrane gasdermin (GSDMD) pores contribute to pro-inflammatory cytokine release and lead to membrane destabilization and cell lysis. IL-1β and IL-18 are pro-inflammatory cytokines that are released following pyroptotic PCD. Brain inflammation increases excitability in the nervous system, promotes seizure activity, and is probably associated with the molecular and synaptic changes involved in epileptogenesis. Pro-inflammatory cytokines affect the glutamate and GABA neurotransmitter release as well as their receptors, thereby resulting in seizure activity. This review is intended to provide an overview of the current published works on pyroptotic cell death in epilepsy. The mechanisms by which pro-inflammatory cytokines, including IL-1β and IL-18 can promote epileptic discharges were also collected. According to this survey, since the involvement of pyroptosis in the development of epilepsy has been established, pyroptosis-targeted therapies may represent a novel anti-epileptogenic strategy.
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Affiliation(s)
- Rabi Atabaki
- Rayan Research Center for Neuroscience & Behavior, Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Hossein Khaleghzadeh-Ahangar
- Department of Physiology, School of Medicine, Babol University of Medical Sciences, Babol, Iran.,Immunoregulation Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Nardana Esmaeili
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Parvaneh Mohseni-Moghaddam
- Department of Physiology, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
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4
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Esmaeili N, Shen G, Zhang H. Genetic manipulation for abiotic stress resistance traits in crops. Front Plant Sci 2022; 13:1011985. [PMID: 36212298 PMCID: PMC9533083 DOI: 10.3389/fpls.2022.1011985] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 09/05/2022] [Indexed: 06/16/2023]
Abstract
Abiotic stresses are major limiting factors that pose severe threats to agricultural production. Conventional breeding has significantly improved crop productivity in the last century, but traditional breeding has reached its maximum capacity due to the multigenic nature of abiotic stresses. Alternatively, biotechnological approaches could provide new opportunities for producing crops that can adapt to the fast-changing environment and still produce high yields under severe environmental stress conditions. Many stress-related genes have been identified and manipulated to generate stress-tolerant plants in the past decades, which could lead to further increase in food production in most countries of the world. This review focuses on the recent progress in using transgenic technology and gene editing technology to improve abiotic stress tolerance in plants, and highlights the potential of using genetic engineering to secure food and fiber supply in a world with an increasing population yet decreasing land and water availability for food production and fast-changing climate that will be largely hostile to agriculture.
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Affiliation(s)
- Nardana Esmaeili
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Sericultural Research Institute, Hangzhou, China
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, United States
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5
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Daniell H, Nair SK, Esmaeili N, Wakade G, Shahid N, Ganesan PK, Islam MR, Shepley-McTaggart A, Feng S, Gary EN, Ali AR, Nuth M, Cruz SN, Graham-Wooten J, Streatfield SJ, Montoya-Lopez R, Kaznica P, Mawson M, Green BJ, Ricciardi R, Milone M, Harty RN, Wang P, Weiner DB, Margulies KB, Collman RG. Debulking SARS-CoV-2 in saliva using angiotensin converting enzyme 2 in chewing gum to decrease oral virus transmission and infection. Mol Ther 2022; 30:1966-1978. [PMID: 34774754 PMCID: PMC8580552 DOI: 10.1016/j.ymthe.2021.11.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/03/2021] [Accepted: 11/07/2021] [Indexed: 12/29/2022] Open
Abstract
To advance a novel concept of debulking virus in the oral cavity, the primary site of viral replication, virus-trapping proteins CTB-ACE2 were expressed in chloroplasts and clinical-grade plant material was developed to meet FDA requirements. Chewing gum (2 g) containing plant cells expressed CTB-ACE2 up to 17.2 mg ACE2/g dry weight (11.7% leaf protein), have physical characteristics and taste/flavor like conventional gums, and no protein was lost during gum compression. CTB-ACE2 gum efficiently (>95%) inhibited entry of lentivirus spike or VSV-spike pseudovirus into Vero/CHO cells when quantified by luciferase or red fluorescence. Incubation of CTB-ACE2 microparticles reduced SARS-CoV-2 virus count in COVID-19 swab/saliva samples by >95% when evaluated by microbubbles (femtomolar concentration) or qPCR, demonstrating both virus trapping and blocking of cellular entry. COVID-19 saliva samples showed low or undetectable ACE2 activity when compared with healthy individuals (2,582 versus 50,126 ΔRFU; 27 versus 225 enzyme units), confirming greater susceptibility of infected patients for viral entry. CTB-ACE2 activity was completely inhibited by pre-incubation with SARS-CoV-2 receptor-binding domain, offering an explanation for reduced saliva ACE2 activity among COVID-19 patients. Chewing gum with virus-trapping proteins offers a general affordable strategy to protect patients from most oral virus re-infections through debulking or minimizing transmission to others.
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Affiliation(s)
- Henry Daniell
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
| | - Smruti K Nair
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Nardana Esmaeili
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Geetanjali Wakade
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Naila Shahid
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Prem Kumar Ganesan
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Md Reyazul Islam
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ariel Shepley-McTaggart
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sheng Feng
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Ebony N Gary
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA
| | - Ali R Ali
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA
| | - Manunya Nuth
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Selene Nunez Cruz
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Jevon Graham-Wooten
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | | | | | - Paul Kaznica
- Fraunhofer USA, Center Mid-Atlantic, Newark, DE 19711, USA
| | | | - Brian J Green
- Fraunhofer USA, Center Mid-Atlantic, Newark, DE 19711, USA
| | - Robert Ricciardi
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Michael Milone
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Ronald N Harty
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ping Wang
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - David B Weiner
- The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104, USA
| | - Kenneth B Margulies
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Ronald G Collman
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
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Zhu X, Shen G, Wijewardene I, Cai Y, Esmaeili N, Sun L, Zhang H. The B'ζ subunit of protein phosphatase 2A negatively regulates ethylene signaling in Arabidopsis. Plant Physiol Biochem 2021; 169:81-91. [PMID: 34773805 DOI: 10.1016/j.plaphy.2021.10.037] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 10/06/2021] [Accepted: 10/24/2021] [Indexed: 06/13/2023]
Abstract
Ethylene is a major plant hormone that regulates plant growth, development, and defense responses to biotic and abiotic stresses. The major pieces of the ethylene signaling pathway have been put together, although several details still need to be elucidated. For instance, the phosphorylation and dephosphorylation processes controlling the ethylene responses are poorly understood and need to be further explored. The type 2A protein phosphatase (PP2A) was suggested to play an important role in the regulation of ethylene biosynthesis, where the A1 subunit of PP2A was shown to be involved in the regulation of the rate-limiting enzyme of the ethylene biosynthetic pathway. However, whether other subunits of PP2A play roles in the ethylene signal transduction pathway is yet to be answered. In this study, we demonstrate that a B subunit, PP2A-B'ζ, positively regulates plant germination and seedling development, as a pp2a-b'ζ mutant is very sensitive to ethylene treatment. Furthermore, PP2A-B'ζ interacts with and stabilizes the kinase CTR1 (Constitutive Triple Response 1), a key enzyme in the ethylene signal transduction pathway, and like CTR1, PP2A-B'ζ negatively regulates ethylene signaling in plants.
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Affiliation(s)
- Xunlu Zhu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Inosha Wijewardene
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Yifan Cai
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Li Sun
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA.
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7
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Esmaeili N, Cai Y, Tang F, Zhu X, Smith J, Mishra N, Hequet E, Ritchie G, Jones D, Shen G, Payton P, Zhang H. Towards doubling fibre yield for cotton in the semiarid agricultural area by increasing tolerance to drought, heat and salinity simultaneously. Plant Biotechnol J 2021; 19:462-476. [PMID: 32902115 PMCID: PMC7955890 DOI: 10.1111/pbi.13476] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [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: 04/23/2020] [Revised: 08/19/2020] [Accepted: 08/23/2020] [Indexed: 05/15/2023]
Abstract
Abiotic stresses such as extreme temperatures, water-deficit and salinity negatively affect plant growth and development, and cause significant yield losses. It was previously shown that co-overexpression of the Arabidopsis vacuolar pyrophosphatase gene AVP1 and the rice SUMO E3 ligase gene OsSIZ1 in Arabidopsis significantly increased tolerance to multiple abiotic stresses and led to increased seed yield for plants grown under single or multiple abiotic stress conditions. It was hypothesized that there might be synergistic effects between AVP1 overexpression and OsSIZ1 overexpression, which could lead to substantially increased yields if these two genes are co-overexpressed in real crops. To test this hypothesis, AVP1 and OsSIZ1 were co-overexpressed in cotton, and the impact of OsSIZ1/AVP1 co-overexpression on cotton's performance under normal growth and multiple stress conditions were analysed. It was found that OsSIZ1/AVP1 co-overexpressing plants performed significantly better than AVP1-overexpressing, OsSIZ1-overexpressing and wild-type cotton plants under single, as well as under multiple stress conditions in laboratory and field conditions. Two field studies showed that OsSIZ1/AVP1 co-overexpressing plants produced 133% and 81% more fibre than wild-type cotton in the dryland conditions of West Texas. This research illustrates that co-overexpression of AVP1 and OsSIZ1 is a viable strategy for engineering abiotic stress-tolerant crops and could substantially improve crop yields in low input or marginal environments, providing a solution for food security for countries in arid and semiarid regions of the world.
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Affiliation(s)
- Nardana Esmaeili
- Department of Biological SciencesTexas Tech UniversityLubbockTXUSA
| | - Yifan Cai
- Department of Biological SciencesTexas Tech UniversityLubbockTXUSA
| | - Feiyu Tang
- College of AgronomyJiangxi Agricultural UniversityNanchangChina
| | - Xunlu Zhu
- Department of Biological SciencesTexas Tech UniversityLubbockTXUSA
| | - Jennifer Smith
- Department of Biological SciencesTexas Tech UniversityLubbockTXUSA
| | - Neelam Mishra
- St. Joseph's College AutonomousBengaluruKarnatakaIndia
| | - Eric Hequet
- Department of Plant and Soil ScienceTexas Tech UniversityLubbockTXUSA
| | - Glen Ritchie
- Department of Plant and Soil ScienceTexas Tech UniversityLubbockTXUSA
| | | | - Guoxin Shen
- Zhejiang Academy of Agricultural SciencesHangzhouChina
| | - Paxton Payton
- USDA‐ARS Cropping Systems Research LaboratoryLubbockTXUSA
| | - Hong Zhang
- Department of Biological SciencesTexas Tech UniversityLubbockTXUSA
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8
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Esmaeili N, Salimi A, Zohuriaan-Mehr MJ, Vafayan M, Meyer W. Bio-based thermosetting epoxy foam: Tannic acid valorization toward dye-decontaminating and thermo-protecting applications. J Hazard Mater 2018; 357:30-39. [PMID: 29859462 DOI: 10.1016/j.jhazmat.2018.05.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 02/21/2018] [Revised: 05/16/2018] [Accepted: 05/22/2018] [Indexed: 06/08/2023]
Abstract
Bio-resourced thermosetting epoxy foam was synthesized from tannic acid toward two different applications e.g., dye-decontaminating and thermo-insulating. Epoxidized tannic acid (ETA) foam was produced without using of organic volatile compounds or flammable foaming gases. The foam density, thermal conductivity and closed-cell content were studied. Besides, TGA showed high char yield (49% in N2 and 48.3% in air) at 600 °C accompanied by high LOI (37.1 in N2 and 36.8 in air). The high thermo-stability and intumescent char yield along with low thermal conductivity recommends the foam suitability for being used as an insulating material. Additionally, sorption of methylene blue onto ETA foam was kinetically investigated. The study of contact time, ionic strength, solution pH, initial sorbate concentration and desorption revealed the dependency of the sorption process to pH and initial sorbate concentration. The experimental data fitted well with the Langmuir isotherm (R2 = 0.997), yielding maximum sorption capacity of 36.25 mg/g (ETA foam = 0.05 g, pH = 7, MB concentration = 50 ppm, Volume = 25 mL). The kinetic data verified that MB sorption could be represented by the pseudo second-order model. Overall, the ETA foam can be introduced as a candidate for removing cationic pollutants, thermal insulator, and self-extinguishing/intumescent materials.
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Affiliation(s)
- N Esmaeili
- Department of Functional Polymer Systems, Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 68, 14476, Potsdam-Golm, Germany; Adhesive and Resin Department, Polymer Processing Faculty, Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran; Bio-based Monomers & Polymers Division (BIOBASED Division), Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran
| | - A Salimi
- Adhesive and Resin Department, Polymer Processing Faculty, Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran.
| | - M J Zohuriaan-Mehr
- Adhesive and Resin Department, Polymer Processing Faculty, Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran; Bio-based Monomers & Polymers Division (BIOBASED Division), Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran
| | - M Vafayan
- Adhesive and Resin Department, Polymer Processing Faculty, Iran Polymer and Petrochemical Institute (IPPI), PO Box 14965-115, Tehran, Iran
| | - W Meyer
- Department of Functional Polymer Systems, Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 68, 14476, Potsdam-Golm, Germany.
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9
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Sun L, Pehlivan N, Esmaeili N, Jiang W, Yang X, Jarrett P, Mishra N, Zhu X, Cai Y, Herath M, Shen G, Zhang H. Co-overexpression of AVP1 and PP2A-C5 in Arabidopsis makes plants tolerant to multiple abiotic stresses. Plant Sci 2018; 274:271-283. [PMID: 30080613 DOI: 10.1016/j.plantsci.2018.05.026] [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: 01/18/2018] [Revised: 04/30/2018] [Accepted: 05/25/2018] [Indexed: 05/20/2023]
Abstract
Abiotic stresses are major threats to agricultural production. Drought and salinity as two of the major abiotic stresses cause billions of losses in agricultural productivity worldwide each year. Thus, it is imperative to make crops more tolerant. Overexpression of AVP1 or PP2A-C5 was previously shown to increase drought and salt stress tolerance, respectively, in transgenic plants. In this study, the hypothesis that co-overexpression of AVP1 and PP2A-C5 would combine their respective benefits and further improve salt tolerance was tested. The two genes were inserted into the same T-DNA region of the binary vector and then introduced into the Arabidopsis genome through Agrobacterium-mediated transformation. Transgenic Arabidopsis plants expressing both AVP1 and PP2A-C5 at relatively high levels were identified and analyzed. These plants displayed enhanced tolerance to NaCl compared to either AVP1 or PP2A-C5 overexpressing plants. They also showed tolerance to other stresses such as KNO3 and LiCl at harmful concentrations, drought, and phosphorus deficiency at comparable levels with either AVP1 or PP2A-C5 overexpressing plants. This study demonstrates that introducing multiple genes in single T-DNA region is an effective approach to create transgenic plants with enhanced tolerance to multiple stresses.
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Affiliation(s)
- Li Sun
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Necla Pehlivan
- Department of Biology, Recep Tayyip Erdogan University, Rize 53100, Turkey
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Weijia Jiang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610064, China
| | - Xiaojie Yang
- Henan Academy of Agricultural Sciences, Zhengzhou, Henan 450002, China
| | - Philip Jarrett
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Neelam Mishra
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Xunlu Zhu
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Yifan Cai
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Maheshika Herath
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China.
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Texas 79409, USA.
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10
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Mishra N, Srivastava AP, Esmaeili N, Hu W, Shen G. Overexpression of the rice gene OsSIZ1 in Arabidopsis improves drought-, heat-, and salt-tolerance simultaneously. PLoS One 2018; 13:e0201716. [PMID: 30092010 PMCID: PMC6084956 DOI: 10.1371/journal.pone.0201716] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 07/21/2018] [Indexed: 12/26/2022] Open
Abstract
Sumoylation is one of the post translational modifications, which affects cellular processes in plants through conjugation of small ubiquitin like modifier (SUMO) to target substrate proteins. Response to various abiotic environmental stresses is one of the major cellular functions regulated by SUMO conjugation. SIZ1 is a SUMO E3 ligase, facilitating a vital step in the sumoylation pathway. In this report, it is demonstrated that over-expression of the rice gene OsSIZ1 in Arabidopsis leads to increased tolerance to multiple abiotic stresses. For example, OsSIZ1-overexpressing plants exhibited enhanced tolerance to salt, drought, and heat stresses, and generated greater seed yields under a variety of stress conditions. Furthermore, OsSIZ1-overexpressing plants were able to exclude sodium ions more efficiently when grown in saline soils and accumulate higher potassium ions as compared to wild-type plants. Further analysis revealed that OsSIZ1-overexpressing plants expressed higher transcript levels of P5CS, a gene involved in the biosynthesis of proline, under both salt and drought stress conditions. Therefore, proline here is acting as an osmoprotectant to alleviate damages caused by drought and salt stresses. These results demonstrate that the rice gene OsSIZ1 has a great potential to be used for improving crop's tolerance to several abiotic stresses.
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Affiliation(s)
- Neelam Mishra
- Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China
- Department of Biological Sciences, Texas Tech University, Lubbock, Texas, United States of America
- Department of Botany, St. Joseph’s College, Bangalore, India
| | - Anurag P. Srivastava
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, United States of America
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, Texas, United States of America
| | - Wenjun Hu
- Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China
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Zhu X, Sun L, Kuppu S, Hu R, Mishra N, Smith J, Esmaeili N, Herath M, Gore MA, Payton P, Shen G, Zhang H. The yield difference between wild-type cotton and transgenic cotton that expresses IPT depends on when water-deficit stress is applied. Sci Rep 2018; 8:2538. [PMID: 29416081 PMCID: PMC5803251 DOI: 10.1038/s41598-018-20944-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 01/26/2018] [Indexed: 11/15/2022] Open
Abstract
Drought is the No. 1 factor that limits agricultural production in the world, thus, making crops more drought tolerant is a major goal in agriculture. Many genes with functions in abiotic stress tolerance were identified, and overexpression of these genes confers increased drought tolerance in transgenic plants. The isopentenyltransferase gene (IPT) that encodes a rate limiting enzyme in cytokinin biosynthesis is one of them. Interestingly, when IPT-transgenic cotton was field-tested at two different sites, Texas and Arizona, different results were obtained. To explain this phenomenon, reduced irrigation experiments with different timing in applying water deficit stress were conducted. It was found that the timing of water deficit stress is critical for IPT-transgenic cotton to display its yield advantage over control plants (i.e. wild-type and segregated non-transgenic plants). If water deficit stress occurs before flowering (vegetative phase), IPT-transgenic cotton would outperform control plants; however, if water deficit stress occurs at or after flowering (reproductive phase), there would not be a yield difference between IPT-transgenic and control cotton plants. This result suggests that an early induction of IPT expression (before first flowering) is needed in order to realize the benefits of IPT-expression in transgenic plants that face water-deficit stress later in development.
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Affiliation(s)
- Xunlu Zhu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Li Sun
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Sundaram Kuppu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Rongbin Hu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Neelam Mishra
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Jennifer Smith
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Maheshika Herath
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA
| | - Michael A Gore
- USDA-ARS, Arid-Land Agricultural Research Center, Maricopa, AZ, 85239, USA
- Plant Breeding and Genetics Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, 14853, USA
| | - Paxton Payton
- USDA-ARS, Cropping Systems Research Laboratory, Lubbock, TX, 79415, USA.
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang Province, China.
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409, USA.
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Esmaeili N, Ebrahimzadeh H, Abdi K. Correlation Between Polyphenol Oxidase (PPO) Activity and Total Phenolic Contents in Crocus sativus L. Corms During Dormancy and Sprouting Stages. Pharmacogn Mag 2017; 13:S519-S524. [PMID: 29142408 PMCID: PMC5669091 DOI: 10.4103/0973-1296.216333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 06/02/2016] [Revised: 07/11/2016] [Indexed: 11/18/2022] Open
Abstract
Purification and characterization of polyphenol oxidase (PPO) enzyme and determination of total phenolic contents during dormancy and sprouting stages in Crocus sativus corms were performed. PPO enzyme was purified by ammonium sulfate precipitation and ion-exchange chromatography using DEAE-Sephadex A25 and two isoenzymes were obtained on the SDS-PAGE, which corresponded to molecular weights of 70 and 54 kDa. The Km values of the enzyme were 4.87 and 2.12 mM for l-DOPA in dormancy and waking stages, respectively. Also, enzyme showed higher Vmax values of 0.026 (ΔOD.min-1) in dormancy compared with the value of 0.019 (ΔOD.min-1) in waking corms. Results showed an inverse correlation between phenolic contents and PPO activity. Accordingly, it can be concluded that as plant progressed through sprouting stage, in contrast to polyphenol oxidase activity, there was a significant increase in total amount of phenolic compounds, as determined by Folin-Ciocalteu method and water and aqueous ethanol extractions. SUMMARY Purification of polyphenol oxidase enzyme using DEAE-Sephadex A25 in Crocus sativus corms.Characterization of polyphenol oxidase enzyme.Comparison of PPO enzyme characteristics in two different physiologic stages of dormancy and sprouting.Determination of phenolic contents.Correlation between phenolic contents and PPO activity during sprouting and dormancy. Abbreviations used: PPO: Polyphenol Oxidase, DEAE-Sephadex: Diethylaminoethyl Sephadex, SDS-PAGE: Sodium Dodecyl Sulfate- Polyacrylamide Gel Electrophoresis, DOPA: Dihydroxyphenylalanine, PEG: Polyethylene Glycol.
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Affiliation(s)
- Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Hassan Ebrahimzadeh
- Department of Plant Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - Khosrou Abdi
- Department of Radiopharmacy and Medicinal Chemistry, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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Mishra N, Sun L, Zhu X, Smith J, Prakash Srivastava A, Yang X, Pehlivan N, Esmaeili N, Luo H, Shen G, Jones D, Auld D, Burke J, Payton P, Zhang H. Overexpression of the Rice SUMO E3 Ligase Gene OsSIZ1 in Cotton Enhances Drought and Heat Tolerance, and Substantially Improves Fiber Yields in the Field under Reduced Irrigation and Rainfed Conditions. Plant Cell Physiol 2017; 58:735-746. [PMID: 28340002 PMCID: PMC5444567 DOI: 10.1093/pcp/pcx032] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [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: 12/05/2016] [Accepted: 02/15/2017] [Indexed: 05/20/2023]
Abstract
The Arabidopsis SUMO E3 ligase gene AtSIZ1 plays important roles in plant response to abiotic stresses as loss of function in AtSIZ1 leads to increased sensitivity to drought, heat and salt stresses. Overexpression of the AtSIZ1 rice homolog, OsSIZ1, leads to increased heat and drought tolerance in bentgrass, suggesting that the function of the E3 ligase SIZ1 is highly conserved in plants and it plays a critical role in abiotic stress responses. To test the possibility that the SUMO E3 ligase could be used to engineer drought- and heat-tolerant crops, the rice gene OsSIZ1 was overexpressed in cotton. We report here that overexpression of OsSIZ1 in cotton results in higher net photosynthesis and better growth than wild-type cotton under drought and thermal stresses in growth chamber and greenhouse conditions. Additionally, this tolerance to abiotic stresses was correlated with higher fiber yield in both controlled-environment and field trials carried out under reduced irrigation and rainfed conditions. These results suggest that OsSIZ1 is a viable candidate gene to improve crop yields under water-limited and rainfed agricultural production systems.
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Affiliation(s)
- Neelam Mishra
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Li Sun
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Xunlu Zhu
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Jennifer Smith
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | | | - Xiaojie Yang
- Economic Crop Research Institute, Henan Academy of Agriculture Sciences, Zhengzhou, China
| | - Necla Pehlivan
- Department of Biology, Recep Tayyip Erdogan University, Rize, Turkey
| | - Nardana Esmaeili
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - Hong Luo
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC, USA
| | - Guoxin Shen
- Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | | | - Dick Auld
- Department of Plant and Soil Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - John Burke
- USDA-ARS Cropping Systems Research Laboratory, Lubbock, TX 79415, USA
| | - Paxton Payton
- USDA-ARS Cropping Systems Research Laboratory, Lubbock, TX 79415, USA
- Corresponding authors: Paxton Payton, E-mail, ; Hong Zhang, E-mail, ; Fax, 806-742-2963
| | - Hong Zhang
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409, USA
- Corresponding authors: Paxton Payton, E-mail, ; Hong Zhang, E-mail, ; Fax, 806-742-2963
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Ezoddin M, Abdi K, Esmaeili N. Ultrasound enhanced air-assisted surfactant liquid–liquid microextraction based on the solidification of an organic droplet for the determination of chromium in water, air and biological samples. Microchem J 2016. [DOI: 10.1016/j.microc.2016.07.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [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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Esmaeili N, Neshati J, Yavari I. Scanning electrochemical microscopy for the investigation of corrosion inhibition of triazino-benzimidazole-2-thiones in hydrochloric acid solution. Res Chem Intermed 2015. [DOI: 10.1007/s11164-015-2369-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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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Esmaeili N, Neshati J, Yavari I. Corrosion inhibition of new thiocarbohydrazides on the carbon steel in hydrochloric acid solution. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2014.07.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Esmaeili N, Ebrahimzadeh H, Abdi K, Mirmasoumi M, Lamei N, Azizi Shamami M. Determination of Metal Content in Crocus sativus L. Corms in Dormancy and Waking Stages. Iran J Pharm Res 2013; 12:31-6. [PMID: 24250569 PMCID: PMC3813218] [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] [Indexed: 11/05/2022]
Abstract
More than 30 mineral elements have been found with different key functions in helping plants and animals to survive and live healthy. As a direct result, they have always attracted the attention of scientists. The quest is to find some efficient analytical and quantitative procedures in this study to determine some mineral and trace elements of Iranian Crocus sativus L. corms. Several studies have been made using distinct methods and eventually, to achieve this purpose, three analytical methods were used as follows: Neutron Activation Analysis (NAA), Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) and Atomic Absorption Spectrophotometry (AAS). Seventeen mineral and trace elements (Mg, Na, Ca, K, Mn, Zn, Cu, Pb, Hg, Ni, Fe, Co, Cd, Sr, Rb, Sc, and Br) were determined in Crocus sativus L. corms in two different physiological stages. The mineral elements content in saffron corms showed a wide variability and their concentrations in dormancy stage were higher than waking. Despite of the fact that K concentration was the highest among all mineral elements studied in both samples, it was nil for Sc, Co, Hg, Pb and Cd.
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Affiliation(s)
- Nardana Esmaeili
- Department of Plant Biology, School of Biology, College of Sciences, Tehran University, Tehran, Iran.
| | - Hassan Ebrahimzadeh
- Department of Plant Biology, School of Biology, College of Sciences, Tehran University, Tehran, Iran.
| | - Khosrou Abdi
- Department of Medicinal Chemistry and Radiopharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, 14174, Iran .
| | - Masoud Mirmasoumi
- Department of Plant Biology, School of Biology, College of Sciences, Tehran University, Tehran, Iran.
| | - Navid Lamei
- Drug Design and Development Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Mehrdad Azizi Shamami
- Nuclear Science and Technology Research Institute-Atomic Energy Organization, Tehran, Iran.
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Golizadeh A, Esmaeili N. Comparative life history and fecundity of Phthorimaea operculella (Lepidoptera: Gelechiidae) on leaves and tubers of different potato cultivars. J Econ Entomol 2012; 105:1809-1815. [PMID: 23156181 DOI: 10.1603/ec12144] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The potato tuberworm, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), is a noxious pest of the potato crop (Solanum tuberosum L.) in both field and storage in tropical and subtropical regions. Survival, development and reproduction of the potato tuberworm was compared on leaves and tubers of 10 common cultivated potato cultivars including Agria, Agata, Almera, Arinda, Baneba, Fiana, Marfona, Ramus, Satina, and Volvox at 25 +/- 1 degree C, 65 +/- 5% RH and a photoperiod of 14:10 (L:D) h. The results indicated that there were significant differences in the larval, pupal, and total developmental periods on the various potato cultivars. The total developmental periods varied from 26.6 (on Baneba) to 29.5 d (on Marfona),and ranged from 27.9 (on Marfona) to 30.5 d (on Agria) in the experiments on potato leaves and tubers, respectively. Immature survival rates were lowest on Agria (44.1%) and Marfona (40.6%) on potato leaves and tubers, respectively. The highest total fecundity was observed on Arinda (78.3 eggs) and Ramus (154.8 egg) on potato leaves and tubers, respectively. Significantly fewer eggs were laid on Marfona cultivar's leaves (44.6 eggs) and tubers (72.9 eggs) than any of the other tested potato cultivars. The female reproduction potential on potato leaves was significantly lower than on potato tubers. Cluster analysis of the biological parameters of P. operculella on different potato cultivars demonstrated that Marfona is partially resistant to potato tuberworm. The findings on the susceptibility or resistance of potato cultivars could be a fundamental component of integrated pest management programs for potato tuberworm.
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Affiliation(s)
- A Golizadeh
- Department of Plant Protection, Faculty of Agriculture, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran.
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Esmaeili N, Ebrahimzadeh H, Abdi K, Safarian S. Determination of some phenolic compounds in Crocus sativus L. corms and its antioxidant activities study. Pharmacogn Mag 2011; 7:74-80. [PMID: 21472084 PMCID: PMC3065162 DOI: 10.4103/0973-1296.75906] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [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: 03/01/2010] [Revised: 03/23/2010] [Accepted: 01/20/2011] [Indexed: 11/21/2022] Open
Abstract
It is well known that phenolic compounds are constituents of many plants. In this study, the total phenolics content in Crocus sativus L. corms in dormancy and waking stages were determined by the Folin-Ciocalteu method. Analysis was carried out by gas chromatography-mass spectrometry (GC-MS) after silylation by N-methyl-N-trimethylsilyl trifluroacetamide (MSTFA) + %1 trimethyl iodosilane (TMIS). Numerous compounds were detected and 11 compounds were identified. The highest phenolics content in waking corms was observed for gentisic acid (5.693 ± 0.057 μg/g) and the lowest for gallic acid (0.416 ± 0.006 μg/g); also these two phenolic compounds are the highest (0.929 ± 0.015 μg/g) and lowest (0.017 ± 0.001 μg/g) phenolics in dormant corms, respectively. The results from quantization and GC-MS analysis showed a high concentration of phenolic compounds in waking corms than the dormant stage. Furthermore, the radical scavenging activities of saffron corms were studied by 1,1-diphenyl-2-pycrylhydrazyl (DPPH) test and EC (50)values were determined about 2055 ppm and 8274 ppm for waking and dormant corms, respectively.
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Affiliation(s)
- N Esmaeili
- Department of Plant Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - H Ebrahimzadeh
- Department of Plant Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
| | - K Abdi
- Department of Medicinal Chemistry and Pharmaceutical Sciences Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - S Safarian
- Department of Cell and Molecular Biology, School of Biology, College of Science, University of Tehran, Tehran, Iran
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Nazari K, Esmaeili N, Mahmoudi A, Rahimi H, Moosavi-Movahedi A. Peroxidative phenol removal from aqueous solutions using activated peroxidase biocatalyst. Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2007.01.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [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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Esmaeili N, Nazari K, Kameli M, Mohajerani B. A kinetic study on autoxidation of α-naphthol-formaldehyde polymer in aqueous alkaline solutions. J Polym Res 2007. [DOI: 10.1007/s10965-006-9096-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Nazari K, Mahmoudi A, Esmaeili N, Sadeghian L, Moosavi-Movahedi AA, Khodafarin R. Denaturation of jack-bean urease by sodium n-dodecyl sulphate: A kinetic study below the critical micelle concentration. Colloids Surf B Biointerfaces 2006; 53:139-48. [PMID: 17010576 DOI: 10.1016/j.colsurfb.2006.08.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Revised: 08/03/2006] [Accepted: 08/03/2006] [Indexed: 10/24/2022]
Abstract
Kinetics of urease denaturation by anionic surfactant (sodium n-dodecyl sulphate, SDS) at concentrations below the critical micelle concentration (CMC) is investigated spectrophotometrically at neutral pH and the corresponding two-phase kinetic parameters of the process are estimated from a three-state reversible process using a binomial exponential relation based on the relaxation time method as: Using a prepared computer program, the experimental data are properly fitted into a binomial exponential relation, considering a two-phase denaturation pathway including a kinetically stable folded intermediate formed at SDS concentration of 1.1 mM. Forward and backward rate constants are estimated as: k(1)=0.2141+/-4.5 x 10(-3), k(2)=5.173 x 10(-3)+/-8.3 x 10(-5), k(-1)=0.09432+/-3.6 x 10(-4) and k(-2)=2.079 x 10(-3)+/-5.6 x 10(-5)s(-1) for the proposed mechanism. The rate-limiting step as well as the reaction coordinates in the denaturation mechanism are established. The mechanism involves formation of a kinetically stable folded native like intermediate through the electrostatic interactions. The intermediate was found to be more stable even than the native form (by about 9 kJmol(-1)) and still hexamer, because no loss of amplitude was observed. Electrophoresis experiments on the native and surfactant/urease complexes indicated a higher mobility for the kinetically folded native like intermediate.
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Affiliation(s)
- K Nazari
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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