1
|
Batov D, Voropaev V, Jafari R, Akturk S, Lazarev V, Karasik V, Trebino R, Tarabrin M. High-sensitivity and high-speed measurements of ultrashort pulses as short as 74 fs at 1.9 µm using a GRENOUILLE device. Opt Express 2024; 32:7391-7403. [PMID: 38439420 DOI: 10.1364/oe.512303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 02/02/2024] [Indexed: 03/06/2024]
Abstract
Ultrashort laser pulse sources in the wavelength range of 1.8 to 2 µm have many potential applications including medicine, materials processing, and sensing. In the use of such lasers, a crucial task is to measure their pulse's temporal intensity and phase. Such measurement devices are most useful when they are simple to build and operate and also have high speed and high sensitivity. The GRENOUILLE measurement device with few components, no moving parts, sensitivity of hundreds of picojoules, and measurement speed of hundreds of milliseconds, is commonly used to solve this problem at other wavelengths. In this paper, the measurement of ultrashort pulses by a GRENOUILLE device, developed using a silicon matrix sensor, for pulses in the wavelength range of 1.8 to 2 µm has been demonstrated. It is shown that ultrashort pulses with durations of 74 to 900 fs and a maximum spectral FWHM of 85 nm can be measured with this device. The recently developed ultra-reliable RANA approach was used for pulse retrieval from the measured traces. The device's performance was validated by comparing its measurements with those obtained by the robust FROG technique.
Collapse
|
2
|
Nonhoff J, Jafari R, Tronnier M. Malad durch Folat - Anaphylaxie nach Folsäure-Substitution. J Dtsch Dermatol Ges 2023; 21 Suppl 2:13-14. [PMID: 37099008 DOI: 10.1111/ddg.15096_g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Affiliation(s)
- Justus Nonhoff
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| | - Rana Jafari
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| | - Michael Tronnier
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| |
Collapse
|
3
|
Jafari R, Khosravi SD, Trebino R. Reliable determination of pulse-shape instability in trains of ultrashort laser pulses using frequency-resolved optical gating. Sci Rep 2022; 12:21006. [PMID: 36470946 PMCID: PMC9722932 DOI: 10.1038/s41598-022-25193-3] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 11/24/2022] [Indexed: 12/12/2022] Open
Abstract
We describe a reliable approach for determining the presence of pulse-shape instability in a train of ultrashort laser pulses. While frequency-resolved optical gating (FROG) has been shown to successfully perform this task by displaying a discrepancy between the measured and retrieved traces for unstable trains, it fails if its pulse-retrieval algorithm stagnates because algorithm stagnation and pulse-shape instability can be indistinguishable. So, a non-stagnating algorithm-even in the presence of instability-is required. The recently introduced Retrieved-Amplitude N-grid Algorithmic (RANA) approach has achieved extremely reliable (100%) pulse-retrieval in FROG for trains of stable pulse shapes, even in the presence of noise, and so is a promising candidate for an algorithm that can definitively distinguish stable and unstable pulse-shape trains. But it has not yet been considered for trains of pulses with pulse-shape instability. So, here, we investigate its performance for unstable trains of pulses with random pulse shapes. We consider trains of complex pulses measured by second-harmonic-generation FROG using the RANA approach and compare its performance to the well-known generalized-projections (GP) algorithm without the RANA enhancements. We show that the standard GP algorithm frequently fails to converge for such unstable pulse trains, yielding highly variable trace discrepancies. As a result, it is an unreliable indicator of instability. Using the RANA approach, on the other hand, we find zero stagnations, even for highly unstable pulse trains, and we conclude that FROG, coupled with the RANA approach, provides a highly reliable indicator of pulse-shape instability. It also provides a typical pulse length, spectral width, and time-bandwidth product, even in cases of instability.
Collapse
Affiliation(s)
- Rana Jafari
- grid.213917.f0000 0001 2097 4943School of Physics, Georgia Institute of Technology, 837 State Street NW, Atlanta, GA 30332 USA
| | - Soroush D. Khosravi
- grid.441645.60000 0001 0448 8435Mathematics & Physics Department, Queens University of Charlotte, 1900 Selwyn Ave, Charlotte, NC 28274 USA
| | - Rick Trebino
- grid.213917.f0000 0001 2097 4943School of Physics, Georgia Institute of Technology, 837 State Street NW, Atlanta, GA 30332 USA
| |
Collapse
|
4
|
Hadinia M, Jafari R. Improvement of performance and sensitivity of 2D and 3D image reconstruction in EIT using EFG forward model. Biomed Phys Eng Express 2022; 8. [PMID: 35263732 DOI: 10.1088/2057-1976/ac5bf1] [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: 10/13/2021] [Accepted: 03/09/2022] [Indexed: 11/12/2022]
Abstract
This paper presents a pure element-free Galerkin method (EFGM) forward model for image reconstruction in 2D and 3D electrical impedance tomography (EIT) using an adaptive current injection method. In EIT systems with the adapting current injection method, both static and dynamic images can be reconstructed; however, determination of electrode contact impedances in the complete electrode model is difficult and the Gap model is used. In this paper, in the EIT forward problem a weak form functional based on the Gap model and a pure EFGM approach are developed, and in the EIT inverse problem, Jacobian matrix is computed by the EFGM, and a fast integration technique is introduced to calculate the entries of the Jacobian matrix within an adequate computation time. The influence of increasing the density of nodes at and near the electrodes with steep electric potential gradients on the accuracy of FEM and EFGM forward solutions is investigated, and the performance of the image reconstruction algorithm with the proposed fast integration technique is examined. The numerical results reveal that the proposed EFGM forward model with the fast integration technique has an efficient performance both in terms of mean relative imaging errors and computational time.
Collapse
Affiliation(s)
- M Hadinia
- Department of Electrical Engineering, College of Electrical Engineering, Langarud Branch, Islamic Azad University, Langarud, Iran
| | - R Jafari
- Department of Medical Biophysics, Western University, London, Ontario, Canada.,Department of Electrical and Computer Engineering, Western University, London, Canada
| |
Collapse
|
5
|
Vazirinasab E, Maghsoudi K, Momen G, Jafari R. On the icephobicity of damage-tolerant superhydrophobic bulk nanocomposites. Soft Matter 2022; 18:412-424. [PMID: 34904993 DOI: 10.1039/d1sm01399h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
To address the increase in demand for superhydrophobic and icephobic surfaces with greater mechanical robustness, we fabricated damage-tolerant, abrasion-insensitive, and icephobic superhydrophobic bulk nanocomposites using a facile, cost-effective, industrially applicable, and environmentally benign strategy. We prepared nanocomposites composed of high-temperature vulcanized silicone rubber through the highly controlled incorporation of nanosized fumed silica and microsized aluminum trihydrate particles. The produced nanocomposites did not require additional processing, such as sand abrasion or plasma treatment, to acquire their superhydrophobic properties. The extended roughness throughout the whole bulk of the nanocomposites imparted the volumetric superhydrophobicity and resistance to mechanical damage. The presence of micro-nanoparticles also enhanced the thermal stability and icephobic properties of the silicone rubber. The icephobic behavior of the developed nanocomposites was assessed based on freezing delay and push-off tests both of which denoted improved icephobic properties, i.e., high freezing delay time and low ice adhesion strength. We verified the extended duration of superhydrophobicity within the bulk nanocomposite using sandpaper abrasion, severe cutter scratching, tape peeling, and water-jet impacts. This study represents the first evaluation, to the best of our knowledge, of the icephobic properties of both the surface and bulk of the produced nanocomposite subjected to several cycles of sandpaper abrasion. Interestingly, even after multiple abrasion cycles, the samples demonstrated considerably low ice adhesion strength confirming their bulk icephobicity. In a nutshell, our findings are very promising for the fabrication of mechanically robust icephobic materials.
Collapse
Affiliation(s)
- E Vazirinasab
- Department of Applied Sciences, University of Québec at Chicoutimi (UQAC), 555, boul. de l'université, Chicoutimi, Québec, G7H 2B1, Canada.
| | - K Maghsoudi
- Department of Applied Sciences, University of Québec at Chicoutimi (UQAC), 555, boul. de l'université, Chicoutimi, Québec, G7H 2B1, Canada.
| | - G Momen
- Department of Applied Sciences, University of Québec at Chicoutimi (UQAC), 555, boul. de l'université, Chicoutimi, Québec, G7H 2B1, Canada.
| | - R Jafari
- Department of Applied Sciences, University of Québec at Chicoutimi (UQAC), 555, boul. de l'université, Chicoutimi, Québec, G7H 2B1, Canada.
| |
Collapse
|
6
|
Ashtari S, Vahedian-Azimi A, Shojaee S, Pourhoseingholi MA, Jafari R, Bashar FR, Zali MR. Computed tomographic features of coronavirus disease-2019 (COVID-19) pneumonia in three groups of Iranian patients: A single center study. Radiologia (Engl Ed) 2021; 63:314-323. [PMID: 34246422 PMCID: PMC8064840 DOI: 10.1016/j.rxeng.2021.03.003] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 03/01/2021] [Indexed: 01/08/2023]
Abstract
Introduction and objectives The pivotal role of chest computed tomographic (CT) to diagnosis and prognosis coronavirus disease-2019 (COVID-19) is still an open field to be explored. This study was conducted to assess the CT features in confirmed cases with COVID-19. Materials and methods Retrospectively, initial chest CT data of 363 confirmed cases with COVID-19 were reviewed. All subjects were stratified into three groups based on patients’ clinical outcomes; non-critical group (n = 194), critical group (n = 65), and death group (n = 104). The detailed of CT findings were collected from patients’ medical records and then evaluated for each group. In addition, multinomial logistic regression was used to analyze risk factors according to CT findings in three groups of patients with COVID-19. Results Compared with the non-critical group, mixed ground-glass opacities (GGO) and consolidation lesion, pleural effusion lesion, presence of diffuse opacity in cases, more than 2 lobes involved and opacity scores were significantly higher in the critical and death groups (P < 0.05). Having more mixed GGO with consolidation, pleural effusion, lack of pure GGO, more diffuse opacity, involvement of more than 2 lobes and high opacity score identified as independent risk factors of critical and death groups. Conclusion CT images of non-critical, critical and death groups with COVID-19 had definite characteristics. CT examination plays a vital role in managing the current COVID-19 outbreak, for early detection of COVID-19 pneumonia. In addition, initial CT findings may be useful to stratify patients, which have a potentially important utility in the current global medical situation.
Collapse
Affiliation(s)
- S Ashtari
- Centro de Investigación de Epidemiología Básica y Molecular de los Trastornos Gastrointestinales, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teheran, Iran
| | - A Vahedian-Azimi
- Centro de investigación de traumatismos, Facultad de Enfermería, Universidad de Ciencias Médicas de Baqiyatallah, Teheran, Iran
| | - S Shojaee
- Centro de Investigación de Epidemiología Básica y Molecular de los Trastornos Gastrointestinales, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teheran, Iran
| | - M A Pourhoseingholi
- Centro de Investigación de Gastroenterología y Enfermedades Hepáticas, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teheran, Iran.
| | - R Jafari
- Departamento de Radiología, Centro de Investigación Sanitaria, Instituto de Estilo de Vida, Universidad de Ciencias Médicas Baqiyatallah, Teheran, Iran
| | - F R Bashar
- Departamento de Anestesia y Cuidados Críticos, Universidad de Ciencias Médicas de Hamadán, Hamadán, Iran
| | - M R Zali
- Centro de Investigación de Gastroenterología y Enfermedades Hepáticas, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teheran, Iran
| |
Collapse
|
7
|
Ashtari S, Vahedian-Azimi A, Shojaee S, Pourhoseingholi MA, Jafari R, Bashar FR, Zali MR. Computed tomographic features of coronavirus disease-2019 (COVID-19) pneumonia in three groups of Iranian patients: A single center study. Radiologia 2021; 63:314-323. [PMID: 35370315 PMCID: PMC7955942 DOI: 10.1016/j.rx.2021.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 03/01/2021] [Indexed: 01/08/2023]
Abstract
INTRODUCTION AND OBJECTIVES The pivotal role of chest computed tomographic (CT) to diagnosis and prognosis coronavirus disease-2019 (COVID-19) is still an open field to be explored. This study was conducted to assess the CT features in confirmed cases with COVID-19. MATERIALS AND METHODS Retrospectively, initial chest CT data of 363 confirmed cases with COVID-19 were reviewed. All subjects were stratified into three groups based on patients' clinical outcomes; non-critical group (n=194), critical group (n=65), and death group (n=104). The detailed of CT findings were collected from patients' medical records and then evaluated for each group. In addition, multinomial logistic regression was used to analyze risk factors according to CT findings in three groups of patients with COVID-19. RESULTS Compared with the non-critical group, mixed ground-glass opacities (GGO) and consolidation lesion, pleural effusion lesion, presence of diffuse opacity in cases, more than 2 lobes involved and opacity scores were significantly higher in the critical and death groups (P<0.05). Having more mixed GGO with consolidation, pleural effusion, lack of pure GGO, more diffuse opacity, involvement of more than 2 lobes and high opacity score identified as independent risk factors of critical and death groups. CONCLUSION CT images of non-critical, critical and death groups with COVID-19 had definite characteristics. CT examination plays a vital role in managing the current COVID-19 outbreak, for early detection of COVID-19 pneumonia. In addition, initial CT findings may be useful to stratify patients, which have a potentially important utility in the current global medical situation.
Collapse
Affiliation(s)
- S Ashtari
- Centro de Investigación de Epidemiología Básica y Molecular de los Trastornos Gastrointestinales, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teherán, Irán
| | - A Vahedian-Azimi
- Centro de investigación de traumatismos, Facultad de Enfermería, Universidad de Ciencias Médicas de Baqiyatallah, Teherán, Irán
| | - S Shojaee
- Centro de Investigación de Epidemiología Básica y Molecular de los Trastornos Gastrointestinales, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teherán, Irán
| | - M A Pourhoseingholi
- Centro de Investigación de Gastroenterología y Enfermedades Hepáticas, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teherán, Irán.
| | - R Jafari
- Departamento de Radiología, Centro de Investigación Sanitaria, Instituto de Estilo de Vida, Universidad de Ciencias Médicas Baqiyatallah, Teherán, Irán
| | - F R Bashar
- Departamento de Anestesia y Cuidados Críticos, Universidad de Ciencias Médicas de Hamadán, Hamadán, Irán
| | - M R Zali
- Centro de Investigación de Gastroenterología y Enfermedades Hepáticas, Instituto de Investigación de Gastroenterología y Enfermedades Hepáticas, Universidad de Ciencias Médicas Shahid Beheshti, Teherán, Irán
| |
Collapse
|
8
|
Ottmann K, Jafari R. Geschichte der Hautklinik in Hildesheim. Aktuelle Dermatologie 2021. [DOI: 10.1055/a-1340-2734] [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: 10/21/2022]
Abstract
ZusammenfassungDie Ursprünge der Klinik für Dermatologie, Venerologie und Allergologie in Hildesheim liegen in einer dermatologischen Belegabteilung, die bereits 1929 in den sich ständig erweiternden Komplex des Städtischen Krankenhauses Hildesheim am Weinberg eingegliedert wurde.Diese Belegabteilung wurde 1984 in eine hauptamtliche Hautklinik im Städtischen Krankenhaus umgewandelt. Im Januar 2005 erfolgte der Wechsel des Klinikums vom kommunalen zu einem privaten Träger. Das Gesamtklinikum ist 2011 in einen modernen Neubau an einem anderen Standort umgezogen.
Collapse
Affiliation(s)
- K. Ottmann
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| | - R. Jafari
- Klinik für Dermatologie, Venerologie und Allergologie, Helios Klinikum Hildesheim
| |
Collapse
|
9
|
Vestberg T, Jafari R, Almeida R, Maurex L, Ingvar M, Petrovic P. Level of play and coach-rated game intelligence are related to performance on design fluency in elite soccer players. Sci Rep 2020; 10:9852. [PMID: 32587269 PMCID: PMC7316809 DOI: 10.1038/s41598-020-66180-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 05/12/2020] [Indexed: 12/16/2022] Open
Abstract
Executive brain functions are innate mechanisms for regulating behavior. While the impact of suboptimal executive functions has been characterized in patients, their contribution to individual success has not been elucidated. We set out to understand how executive functions relate to successful human behavior by examining their relation to game intelligence in sport - the ability to read a game and quickly adapt the behavior. In elite soccer players (n = 51), those playing in national teams (national team players) significantly outperformed those only playing at premier league level (premier league players) in Design Fluency (DF), a complex visuo-spatial executive function test that includes measures of creativity and cognitive flexibility. Their result showed a moderate correlation with coach rated game intelligence, remained also when correcting for low level cognitive capacity and was most evident when considering cognitive flexibility. DF capacity also correlated with number of assists made during the season but not with number of made goals during the same period, linking the fast planning of several steps in DF to fast planning of several steps in the soccer game. Altogether, our data suggests that DF capacity relates to success in soccer both on a subjective and on an objective level.
Collapse
Affiliation(s)
- T Vestberg
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - R Jafari
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - R Almeida
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Stockholm University, Brain Imaging Center, Stockholm, Sweden
| | - L Maurex
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - M Ingvar
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - P Petrovic
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
| |
Collapse
|
10
|
Moazam F, Jafari R, Bashari H, Mosaddeghi MR. Grazing gradient detection and assessment in arid rangelands of central Iran using remote sensing and soil-vegetation characteristics. Rangel J 2020. [DOI: 10.1071/rj20076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
One key tool to manage fragile ecosystems in arid lands is knowledge of land degradation. For this purpose, field-based soil and vegetation characteristics were related to remote sensing information extracted from Landsat OLI moving standard deviation index (MSDI), normalised difference vegetation index (NDVI), soil-adjusted vegetation index (SAVI) and modified soil-adjusted vegetation index (MSAVI) in degraded (watering points and livestock camps) and reference sites of arid rangelands of Iran. Values of spectral indices along grazing gradients at a distance of 50–1500m from the centre of degradation were also extracted and analysed. Statistical analysis (t-test and ordination analysis) shows that MSDI is a sensitive index of landscape heterogeneity and, unlike other indices, exhibits a significant difference between degraded and reference sites. MSDI was sensitive to grazing gradients around watering points and livestock camps, and declined with increasing distance from these areas, although this varied between different sites due to grazing intensity and characteristics of soil and vegetation cover. Soil analysis showed that the amount of organic carbon, mean weight diameter (MWD), geometric mean diameter (GMD) and soil stability indicator (SSI) at reference sites were significantly higher than those at degraded areas. Ordination analysis confirmed the results of t-test regarding the high potential capability of MSDI in separating degraded areas. This simple and practical index can be used to determine ecological thresholds and investigating rangeland condition in arid ecosystems.
Collapse
|
11
|
Jafari R, Mahdavifar S, Akbari A. Geometrically frustrated anisotropic four-leg spin-1/2 nanotube. J Phys Condens Matter 2019; 31:495601. [PMID: 31412325 DOI: 10.1088/1361-648x/ab3b45] [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] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We develop a real space quantum renormalization group (QRG) to explore a frustrated anisotropic four-leg spin-1/2 nanotube in the thermodynamic limit. We obtain the phase diagram, fixed points, critical points, the scaling of coupling constants and magnetization curves. Our investigation points out that, in the case of strong leg coupling, the diagonal frustrating interaction is marginal under QRG transformations and does not affect the universality class of the model. Remarkably, the renormalization equations express that the spin nanotube prepared in the strong leg coupling case goes to the strong plaquette coupling limit (weakly interacting plaquettes). Subsequently, in the limit of weakly interacting plaquettes, the model is mapped onto a 1D spin-1/2 XXZ chain in a longitudinal magnetic field under QRG transformation. Furthermore, the effective Hamiltonian of the spin nanotube inspires both first and second order phase transitions accompanied by the fractional magnetization plateaus. Our results show that the anisotropy changes the magnetization curve and the phase transition points, significantly. Finally, we report the numerical exact diagonalization results to compare the ground state phase diagram with our analytical visions.
Collapse
Affiliation(s)
- R Jafari
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran. Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden. Beijing Computational Science Research Center, Beijing 100094, People's Republic of China
| | | | | |
Collapse
|
12
|
Vakili Moghaddam M, Fallahpour M, Mohammadi M, Rasi Varaee FS, Mokhtarian K, Khoshmirsafa M, Jafari R, Shirzad N, Falak R. Identification of polcalcin as a novel allergen of Amaranthus retroflexus pollen. Allergol Immunopathol (Madr) 2019; 47:357-364. [PMID: 30770138 DOI: 10.1016/j.aller.2018.12.006] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 12/13/2018] [Accepted: 12/29/2018] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Amaranthus retroflexus (Redroot Pigweed) is one of the main sources of allergenic pollens in temperate areas. Polcalcin is a well-known panallergen involved in cross-reactivity between different plants. The aim of this study was the molecular cloning and expression of polcalcin, as well as evaluating its IgE-reactivity with A. retroflexus sensitive patients' sera. METHODS Allergenic extract was prepared from A. retroflexus pollen and the IgE-reactivity profile was determined by ELISA and immunoblotting using sera from twenty A. retroflexus sensitive patients. Polcalcin-coding sequence was amplified by conventional PCR method and the product was inserted into pET-21b(+) vector. The recombinant protein was expressed in E. coli BL21 and purified by metal affinity chromatography. The IgE-binding capability of the recombinant protein was analyzed by ELISA and immunoblotting assays, and compared with crude extract. RESULTS Of 20 skin prick test positive patients, 17 patients were positive in IgE-specific ELISA. Western blotting confirmed that approximately 53% of ELISA positive patients reacted with 10kDa protein in crude extract. The A. retroflexus polcalcin gene, encoding to 80 amino acid residues was cloned and expressed as a soluble protein and designated as Ama r 3. The recombinant polcalcin showed rather identical IgE-reactivity in ELISA and western blotting with 10kDa protein in crude extract. These results were confirmed by inhibition methods, too. CONCLUSION The recombinant form of A. retroflexus polcalcin (Ama r 3) could be easily produced in E. coli in a soluble form and shows rather similar IgE-reactivity with its natural counterpart.
Collapse
Affiliation(s)
- M Vakili Moghaddam
- Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - M Fallahpour
- Department of Allergy and Clinical Immunology, Iran University of Medical Sciences, Tehran, Iran
| | - M Mohammadi
- Persian Gulf Marine Biotechnology Research Center, Persian Gulf Biomedical Sciences Research Institute, Bushehr University of Medical Sciences, Bushehr, Iran
| | - F S Rasi Varaee
- Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - K Mokhtarian
- Clinical Biochemistry Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - M Khoshmirsafa
- Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - R Jafari
- Department of Immunology, School of Medicine, Shahroud University of Medical Sciences, Shahroud, Iran
| | - N Shirzad
- Department of Immunology, School of Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - R Falak
- Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran; Department of Immunology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
13
|
Escoto E, Jafari R, Trebino R, Steinmeyer G. Retrieving the coherent artifact in frequency-resolved optical gating. Opt Lett 2019; 44:3142-3145. [PMID: 31199401 DOI: 10.1364/ol.44.003142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 05/16/2019] [Indexed: 06/09/2023]
Abstract
When confronted with a pulse train whose intensity and/or phase versus time varies from pulse to pulse, multi-shot pulse-measurement techniques usually exhibit a coherent artifact (CA), which substantially complicates the interpretation of the measurement. In frequency-resolved optical gating (FROG), such instabilities are indicated by discrepancies between the measured and retrieved FROG traces. Here we consider the simultaneous retrieval of the CA and the average pulse characteristics from a single FROG trace in the limit of significant fluctuations. We use a modified generalized projections algorithm. Two electric fields are simultaneously retrieved, while the data constraint is updated as the algorithm progresses using only the assumption that the trace can be modeled as the sum of two spectrograms, one corresponding to the pulse and the other corresponding to the CA. An additional flat-spectral-phase constraint is added to one of the fields to ensure that it only reacts to the presence of the CA. Using this novel retrieval method, the complete retrieval of the characteristics of pulses in an unstable train from FROG traces is demonstrated.
Collapse
|
14
|
Jafari R, Jones T, Trebino R. 100% reliable algorithm for second-harmonic-generation frequency-resolved optical gating. Opt Express 2019; 27:2112-2124. [PMID: 30732254 DOI: 10.1364/oe.27.002112] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We demonstrate a novel algorithmic approach for the second-harmonic-generation (SHG) frequency-resolved optical gating (FROG) ultrashort-pulse-measurement technique that always converges and, for complex pulses, is also much faster. It takes advantage of the Paley-Wiener Theorem to retrieve the precise pulse spectrum-half the desired information-directly from the measured trace. It also uses a multi-grid approach, permitting the algorithm to operate on smaller arrays for early iterations and on the complete array for only the final few iterations. We tested this approach on more than 25,000 randomly generated complex pulses with time-bandwidth products up to 100, yielding SHG FROG traces to which noise was added, and have achieved convergence to the correct pulse in all cases. Moreover, convergence occurs in less than half the time for extremely large traces corresponding to extremely complex pulses.
Collapse
|
15
|
Jafari R, Trebino R. High-speed "multi-grid" pulse-retrieval algorithm for frequency-resolved optical gating. Opt Express 2018; 26:2643-2649. [PMID: 29401801 DOI: 10.1364/oe.26.002643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 01/02/2018] [Indexed: 06/07/2023]
Abstract
We use an algorithmic technique called "multi-grid" to improve the speed of convergence of the cross-correlation frequency-resolved-optical-gating (XFROG) pulse-retrieval algorithm for very complex pulses. The multi-grid approach uses a smaller trace (N/4 × N/4) drawn from the original N × N trace for initial iterations, yielding poorer resolution and range, but proceeding ~16 times faster for such iterations. The pulse field rapidly retrieved from this smaller array then provides the initial guess for the larger, full array, significantly reducing the number of iterations required on the full array. We first find that, for simple pulses and their resulting simple traces, the original generalized-projections FROG and XFROG algorithms already converge in less time than is required to plot the retrieved pulse, so speed improvements for them appear irrelevant in general. Considering therefore only complex pulses and their resulting complex traces, we adapted the multi-grid algorithm to XFROG, the technique used for complex pulses whenever possible. We show that extending multi-grid to even smaller arrays is not helpful, but intermediate-size arrays of N/2 × N/2 are, further reducing the number of iterations on the full array and further decreasing convergence time. We obtain a factor of ~7 improvement in speed for very complex pulses with time-bandwidth products of 50 to 90. This approach does not require modifications to the algorithm itself and so can be used in conjunction with essentially all FROG algorithms for improved speed. And it retains FROG's ability to determine the pulse-shape stability in multi-shot measurements.
Collapse
|
16
|
Zhu P, Jafari R, Jones T, Trebino R. Complete measurement of spatiotemporally complex multi-spatial-mode ultrashort pulses from multimode optical fibers using delay-scanned wavelength-multiplexed holography. Opt Express 2017; 25:24015-24032. [PMID: 29041350 DOI: 10.1364/oe.25.024015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 09/02/2017] [Indexed: 06/07/2023]
Abstract
We introduce a simple delay-scanned complete spatiotemporal intensity-and-phase measurement technique based on wavelength-multiplexed holography to characterize long, complex pulses in space and time. We demonstrate it using pulses emerging from multi-mode fiber. This technique extends the temporal range and spectral resolution of the single-frame STRIPED FISH technique without using an otherwise-required expensive ultranarrow-bandpass filter. With this technique, we measured the complete intensity and phase of up to ten fiber modes from a multi-mode fiber (normalized frequency V ≈10) over a ~3ps time range. Spatiotemporal complexities such as intermodal delay, modal dispersion, and material dispersion were also intuitively displayed by the retrieved results. Agreement between the reconstructed color movies and the monitored time-averaged spatial profiles confirms the validity to this delay-scanned STRIPED FISH method.
Collapse
|
17
|
Nezhadianbaran J, Jafari R, Mohammadi M. Comparison of working memory, divided and selective attention in children with different types of attention deficit hyperactivity disorder- ADHD. J Fundam and Appl Sci 2017. [DOI: 10.4314/jfas.v9i1s.733] [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: 11/17/2022] Open
|
18
|
Abstract
A quantum phase transition is generally thought to imprint distinctive characteristics on the nonequilibrium dynamics of a closed quantum system. Specifically, the Loschmidt echo after a sudden quench to a quantum critical point-measuring the time dependence of the overlap between initial and time-evolved states-is expected to exhibit an accelerated relaxation followed by periodic revivals. We here introduce a new exactly solvable model, the extended Su-Schrieffer-Heeger model, the Loschmidt echo of which provides a counterexample. A parallell analysis of the quench dynamics of the three-site spin-interacting XY model allows us to pinpoint the conditions under which a periodic Loschmidt revival actually appears.
Collapse
Affiliation(s)
- R Jafari
- Beijing Computational Science Research Center, Beijing 100094, China
- Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden
- Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Henrik Johannesson
- Beijing Computational Science Research Center, Beijing 100094, China
- Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden
| |
Collapse
|
19
|
Jafari F, Jafari R, Bashari H. Assessing the performance of remotely sensed landscape function indices in semi-arid rangelands of Iran. Rangel J 2017. [DOI: 10.1071/rj16053] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Appropriate rangeland management requires rangeland function analysis at broad scales. This study aimed to examine the potential of remotely sensed function indices extracted from Landsat data to evaluate the function of semi-arid rangelands in central Iran at the sub-basin scale. Three replicate 30-m transects were randomly placed in the dominant slope direction of 14 selected sub-basins. Various structural properties of vegetation (e.g. number and size of vegetation patches and interpatch lengths) and soil surface were scored based on the landscape function analysis (LFA) procedure. The obtained structural and function indices of the LFA, as well as field percent vegetation cover, were compared with the perpendicular distance vegetation index and remotely sensed function indices including proximity, lacunarity, leakiness index, and weighted mean patch size (WMPS). Remotely sensed function indices were found to be capable of discriminating rangeland landscapes with different conditions. Results showed that the structural properties of vegetation considered in the LFA could also be obtained through WMPS and proximity indices (R >0.76; P < 0.01). All indices, except for lacunarity, had significant correlations with percent vegetation cover and the strongest correlation was observed between WMPS and proximity. Our findings highlight the usefulness and efficiency of function indices derived from satellite data in the estimation of structural and functional properties of rangeland landscapes at the sub-basin scale.
Collapse
|
20
|
Warpman Berglund U, Sanjiv K, Gad H, Kalderén C, Koolmeister T, Pham T, Gokturk C, Jafari R, Maddalo G, Seashore-Ludlow B, Chernobrovkin A, Manoilov A, Pateras IS, Rasti A, Jemth AS, Almlöf I, Loseva O, Visnes T, Einarsdottir BO, Gaugaz FZ, Saleh A, Platzack B, Wallner OA, Vallin KSA, Henriksson M, Wakchaure P, Borhade S, Herr P, Kallberg Y, Baranczewski P, Homan EJ, Wiita E, Nagpal V, Meijer T, Schipper N, Rudd SG, Bräutigam L, Lindqvist A, Filppula A, Lee TC, Artursson P, Nilsson JA, Gorgoulis VG, Lehtiö J, Zubarev RA, Scobie M, Helleday T. Validation and development of MTH1 inhibitors for treatment of cancer. Ann Oncol 2016; 27:2275-2283. [PMID: 27827301 DOI: 10.1093/annonc/mdw429] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 09/01/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Previously, we showed cancer cells rely on the MTH1 protein to prevent incorporation of otherwise deadly oxidised nucleotides into DNA and we developed MTH1 inhibitors which selectively kill cancer cells. Recently, several new and potent inhibitors of MTH1 were demonstrated to be non-toxic to cancer cells, challenging the utility of MTH1 inhibition as a target for cancer treatment. MATERIAL AND METHODS Human cancer cell lines were exposed in vitro to MTH1 inhibitors or depleted of MTH1 by siRNA or shRNA. 8-oxodG was measured by immunostaining and modified comet assay. Thermal Proteome profiling, proteomics, cellular thermal shift assays, kinase and CEREP panel were used for target engagement, mode of action and selectivity investigations of MTH1 inhibitors. Effect of MTH1 inhibition on tumour growth was explored in BRAF V600E-mutated malignant melanoma patient derived xenograft and human colon cancer SW480 and HCT116 xenograft models. RESULTS Here, we demonstrate that recently described MTH1 inhibitors, which fail to kill cancer cells, also fail to introduce the toxic oxidized nucleotides into DNA. We also describe a new MTH1 inhibitor TH1579, (Karonudib), an analogue of TH588, which is a potent, selective MTH1 inhibitor with good oral availability and demonstrates excellent pharmacokinetic and anti-cancer properties in vivo. CONCLUSION We demonstrate that in order to kill cancer cells MTH1 inhibitors must also introduce oxidized nucleotides into DNA. Furthermore, we describe TH1579 as a best-in-class MTH1 inhibitor, which we expect to be useful in order to further validate the MTH1 inhibitor concept.
Collapse
Affiliation(s)
- U Warpman Berglund
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - K Sanjiv
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - H Gad
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - C Kalderén
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - T Koolmeister
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - T Pham
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - C Gokturk
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - R Jafari
- Clinical Proteomics Mass Spectrometry, Department of Oncology-Pathology
| | - G Maddalo
- Clinical Proteomics Mass Spectrometry, Department of Oncology-Pathology
| | - B Seashore-Ludlow
- Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - A Chernobrovkin
- Division of Physiological Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - A Manoilov
- Division of Physiological Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - I S Pateras
- Molecular Carcinogenesis Group, Department of Histology and Embryology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - A Rasti
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - A-S Jemth
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - I Almlöf
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - O Loseva
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - T Visnes
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - B O Einarsdottir
- Sahlgrenska Translational Melanoma Group (SATMEG), Sahlgrenska Cancer Center, Department of Surgery, Institute of Clinical Sciences, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg
| | - F Z Gaugaz
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics.,Department of Pharmacy and
| | - A Saleh
- Science for Life Laboratory Drug Discovery and Development Platform, ADME of Therapeutics facility, Department of Phamracy, Uppsala University, Uppsala, Sweden
| | - B Platzack
- Swedish Toxicology Sciences Research Center, Södertälje, Sweden
| | - O A Wallner
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - K S A Vallin
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - M Henriksson
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - P Wakchaure
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - S Borhade
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - P Herr
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - Y Kallberg
- National Bioinformatics Infrastructure Sweden (NBIS), Science for Life Laboratory, Department of Medicine Solna, Karolinska Institutet, Stockholm
| | - P Baranczewski
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics.,Science for Life Laboratory Drug Discovery and Development Platform, ADME of Therapeutics facility, Department of Phamracy, Uppsala University, Uppsala, Sweden
| | - E J Homan
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - E Wiita
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - V Nagpal
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics.,SP Process Development, Södertälje, Sweden
| | - T Meijer
- SP Process Development, Södertälje, Sweden
| | - N Schipper
- SP Process Development, Södertälje, Sweden
| | - S G Rudd
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - L Bräutigam
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - A Lindqvist
- Science for Life Laboratory Drug Discovery and Development Platform, ADME of Therapeutics facility, Department of Phamracy, Uppsala University, Uppsala, Sweden
| | - A Filppula
- Uppsala Drug Optimisation and Pharmaceutical Profiling Platform (UDOPP), Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - T-C Lee
- Institute of biomedical sciences, Academia Sinica, Taipei-115, Taiwan
| | - P Artursson
- Department of Pharmacy and.,Science for Life Laboratory Drug Discovery and Development Platform, ADME of Therapeutics facility, Department of Phamracy, Uppsala University, Uppsala, Sweden.,Uppsala Drug Optimisation and Pharmaceutical Profiling Platform (UDOPP), Department of Pharmacy, Uppsala University, Uppsala, Sweden
| | - J A Nilsson
- Sahlgrenska Translational Melanoma Group (SATMEG), Sahlgrenska Cancer Center, Department of Surgery, Institute of Clinical Sciences, University of Gothenburg and Sahlgrenska University Hospital, Gothenburg
| | - V G Gorgoulis
- Biomedical Research Foundation of the Academy of Athens, Athens, Greece.,Faculty Institute for Cancer Sciences, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, UK
| | - J Lehtiö
- Clinical Proteomics Mass Spectrometry, Department of Oncology-Pathology
| | - R A Zubarev
- Division of Physiological Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - M Scobie
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| | - T Helleday
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics
| |
Collapse
|
21
|
Panahi Y, Kianpour P, Mohtashami R, Jafari R, Sahebkar A. Lipid-modifying effects of curcumin in patients with non-alcoholic fatty liver disease. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.752] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
22
|
Abstract
This paper presents the application of the hybrid finite element-element free Galerkin (FE-EFG) method for the forward and inverse problems of electrical impedance tomography (EIT). The proposed method is based on the complete electrode model. Finite element (FE) and element-free Galerkin (EFG) methods are accurate numerical techniques. However, the FE technique has meshing task problems and the EFG method is computationally expensive. In this paper, the hybrid FE-EFG method is applied to take both advantages of FE and EFG methods, the complete electrode model of the forward problem is solved, and an iterative regularized Gauss-Newton method is adopted to solve the inverse problem. The proposed method is applied to compute Jacobian in the inverse problem. Utilizing 2D circular homogenous models, the numerical results are validated with analytical and experimental results and the performance of the hybrid FE-EFG method compared with the FE method is illustrated. Results of image reconstruction are presented for a human chest experimental phantom.
Collapse
Affiliation(s)
- M Hadinia
- Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
| | | | | |
Collapse
|
23
|
Jafari R, Baziar M, Bleek B, Reuter M, Montag C. Personality attributes of Iranian people who stutter. J Commun Disord 2015; 58:119-125. [PMID: 26547120 DOI: 10.1016/j.jcomdis.2015.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 09/04/2015] [Accepted: 10/07/2015] [Indexed: 06/05/2023]
Abstract
Two recent studies from Australia and Germany have both shown that people who stutter (PWS) have elevated Neuroticism scores on the widely used NEO Five Factor Inventory (NEO-FFI) compared to individuals in a control sample. The two studies showed opposite results, however, for the personality traits Agreeableness and Conscientiousness. One reason for these opposing findings could be that the two studies were conducted in different cultural settings. Given that the effect of different cultural background on the relationship between the NEO-FFI and stuttering remains an open question, we investigated the NEO-FFI scores from 98 PWS and an age- and sex-matched control-group from a less widely studied cultural background (Iran). Overall, the present study showed, in line with a study from Germany, higher Agreeableness, but not Neuroticism, in PWS compared to normally fluent controls. To get further insights into these findings, we also contrasted both samples from Iran with a healthy matched sample from Germany. The resulting cross-cultural differences from these analyses are also discussed in the present paper. Although the present study is limited by a cross-sectional design, and so no causal conclusions can be drawn, the authors discuss whether the replicated elevated Agreeableness scores in PWS might represent a self-defense mechanism to cope with one's own speech handicap.
Collapse
Affiliation(s)
- R Jafari
- Department of Speech and Language Pathology, Tehran University of Medical Sciences, Tehran, Iran
| | - M Baziar
- Department of Speech and Language Pathology, Iran University of Medical Sciences, Tehran, Iran
| | - B Bleek
- Department of Psychology, University of Bonn, Bonn, Germany
| | - M Reuter
- Department of Psychology, University of Bonn, Bonn, Germany; Center for Economics and Neuroscience, University of Bonn, Bonn, Germany
| | - C Montag
- Institute of Psychology and Education, Ulm University, Ulm, Germany.
| |
Collapse
|
24
|
Ahmadi M, Jafari R, Marashi SA, Farazmand A. Indirect role of microRNAs and transcription factors in the regulation of important cancer genes: A network biology approach. Cell Mol Biol (Noisy-le-grand) 2015; 61:100-107. [PMID: 26518901] [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: 10/02/2015] [Accepted: 10/08/2015] [Indexed: 06/05/2023]
Abstract
Cancer is one of the leading causes of death worldwide. Although the mechanisms of gene regulation in cancer have been the subject of intense investigation during the last decades, the precise role of regulatory processes in cancer is largely unknown. More specifically, it is not completely understood how microRNAs and transcription factors regulate and influence the cancer-related processes. In the present study, using cancer-specific biological networks we examine the role of microRNAs and transcription factors (TFs) in regulation of important cancer genes. The importance measures which are used in this study consider both network structure information and biological data on miRNA- and TF-based gene regulation. By analyzing cancer-specific PPI, signaling and metabolic networks, it was shown that microRNAs and transcription factors tend to regulate those genes which are in the neighborhood of important components of cancer-specific PPI, signaling, and metabolic networks. The role of microRNAs was found to be particularly important, which confirms our previously-published results on the importance of microRNAs in detecting important network components. Moreover, we highlight that the miRNAs appear to apply their function via regulating the "neighbors" of important cancer genes, which implies their indirect role in cancer, and presumably, in fine-tuning the effect of other cancer-related genes.
Collapse
Affiliation(s)
- M Ahmadi
- University of Tehran Institute of Biochemistry and Biophysics Tehran Iran
| | - R Jafari
- Tarbiat Modares University Department of Nanobiotechnology, Faculty of Biological Sciences Tehran Iran
| | - S A Marashi
- University of Tehran Department of Biotechnology, College of Science Tehran Iran marashi@ut.ac.ir
| | - A Farazmand
- University of Tehran School of Biology, College of Science Tehran Iran afarazmand@khayam.ut.ac.ir
| |
Collapse
|
25
|
Akhavan AA, Veysi A, Arandian MH, Vatandoost H, Yaghoobi-Ershadi MR, Hosseini M, Abdoli H, Heidari K, Sadjadi A, Fadaei R, Ramazanpour J, Aminian K, Shirzadi MR, Jafari R. Field evaluation of phostoxin and zinc phosphide for the control of zoonotic cutaneous leishmaniasis in a hyperendemic area, central Iran. J Vector Borne Dis 2014; 51:307-312. [PMID: 25540963] [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] [Indexed: 06/04/2023] Open
Abstract
BACKGROUND & OBJECTIVES ZCL is a growing threat in many rural areas of Iran which involves 17 out of 31 provinces. This study was conducted from April to November 2011 for evaluation of the efficacy of phostoxin and zinc phosphide against rodents. METHODS Rodent control operations were carried out using phostoxin and zinc phosphide. To evaluate the effect of rodent control operation on the main vector density, an entomological survey was carried out. The effects of the operation on the disease incidence were also evaluated. RESULTS After intervention, the reduction rate of rodent burrows was 32.68% in the village treated with phostoxin and 58.14% in the village treated with zinc phosphide. The number of rodent holes in the control area showed 6.66-fold increase at the end of the study. The incidence of the disease decreased to 19.23 and 11.40 in areas treated with phostoxin and zinc phosphide, respectively. A total of 4243 adult sandflies were collected and identified. The most common and dominant species was Phlebotomus papatasi. In the village treated with phostoxin, the density of P. papatasi in outdoors was lower than indoors. Nevertheless, the density of P. papatasi in the village treated with zinc phosphide was higher in outdoors. INTERPRETATION & CONCLUSION It is concluded that phostoxin is less effective and has low safety in comparison with zinc phosphide, so that this rodenticide can be used only in special situations such as lack or ineffective rodenticides and only in the colonies far from human and animal dwelling places in small scales.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - R Jafari
- Esfahan Health Research Station, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| |
Collapse
|
26
|
Jafari R, Najafzadeh N, Sedaghat MM, Parvizi P. Molecular characterization of sandflies and Leishmania detection in main vector of zoonotic cutaneous leishmaniasis in Abarkouh district of Yazd province, Iran. ASIAN PAC J TROP MED 2013; 6:792-7. [DOI: 10.1016/s1995-7645(13)60140-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 08/15/2013] [Accepted: 09/15/2013] [Indexed: 10/26/2022] Open
|
27
|
Saeidi Z, Vatandoost H, Akhavan AA, Yaghoobi-Ershadi MR, Rassi Y, Arandian MH, Jafari R. Baseline insecticide susceptibility data of Phlebotomus papatasi in Iran. J Vector Borne Dis 2013; 50:57-61. [PMID: 23703441] [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] [Indexed: 06/02/2023] Open
Abstract
BACKGROUND & OBJECTIVES Phlebotomine sandflies (Diptera: Psychodidae) play main role in the transmission of different forms of leishmaniasis in the world. Phlebotomus papatasi is the main vector of zoonotic cutaneous leishmaniasis (ZCL) in Iran. There are several control measures for vector control using different classes of insecticides. The aim of this study was to breed the sandflies which were collected from a hyperendemic focus of the disease in central Iran in the laboratory condition and to determine its baseline susceptibility to commonly used insecticides. METHODS Sandflies were collected from the field and were reared in insectary. Susceptibility tests were carried out on their generation. Baseline susceptibility of sandflies to DDT and pyrethroids was evaluated based on LT50 values. A total of 1305 specimens were tested using different time intervals. The LT50 and LT90 values were measured according to the WHO standard tests. The results were plotted using probit analysis and regression lines. RESULTS The results against female sandflies revealed the LT50 values of 1312.66, 253.66, 36.04, 9.38 and 6 sec to DDT (4%), permethrin (0.75%), deltamethrin (0.1%), cyfluthrin (0.15%) and lambda-cyhalothrin (0.05%), respectively. The figures for male sandflies were 1200.97, 310.10, 18.63, 6.08 and 0.77 sec respectively to the above insecticides. CONCLUSION The results of this study could help to provide a clue for implementation of currently used insecticides. Furthermore, a specific guideline is needed for monitoring and evaluation of insecticide susceptibility test against sandflies.
Collapse
Affiliation(s)
- Z Saeidi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | | | | | | | | |
Collapse
|
28
|
Dubrawski K, Tebianian S, Bi H, Chaouki J, Ellis N, Gerspacher R, Jafari R, Kantzas A, Lim C, Patience G, Pugsley T, Qi M, Zhu J, Grace J. Traveling column for comparison of invasive and non-invasive fluidization voidage measurement techniques. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2012.10.031] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
29
|
Veysi A, Vatandoost H, Yaghoobi-Ershadi MR, Arandian MH, Jafari R, Hosseini M, abdoli H, Rassi Y, Heidari K, Sadjadi A, Fadaei R, Ramazanpour J, Aminian K, Shirzadi MR, Akhavan AA. Comparative study on the effectiveness of coumavec® and zinc phosphide in controlling zoonotic cutaneous leishmaniasis in a hyperendemic focus in central iran. J Arthropod Borne Dis 2012; 6:18-27. [PMID: 23293775 PMCID: PMC3528166] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 01/03/2012] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Zoonotic cutaneous leishmaniasis (ZCL) is an increasing health problems in many rural areas of Iran. The aim of this study was to introduce a new alternative rodenticide to control the reservoirs of ZCL, its effect on the vector density and the incidence of the disease in hyperendemic focus of Esfahan County, central Iran. METHODS The study was carried out from January 2011 to January 2012. In intervention areas, rodent control operation was conducted using zinc phosphide or Coumavec®. Active case findings were done by house-to-house visits once every season during 2011-2012. To evaluate the effect of rodent control operation on the vector density, sand flies were collected twice a month using sticky traps. RESULTS The reduction rate of rodent holes in intervention areas with Coumavec® and zinc phosphide were 48.46% and 58.15% respectively, whereas in control area results showed 6.66 folds intensification. The Incidence of ZCL significantly reduced in the treated areas. Totally, 3200 adult sand flies were collected and identified in the intervention and control areas. In the treated area with zinc phosphide, the density of Phlebotomus papatasi was higher in outdoors in contrast with the treated area by Coumavec® which the density of the sand fly was higher in indoors. CONCLUSION Both rodenticides were effective on the incidence of ZCL and the population of the reservoirs as well. Coumavec® seems to be effective on the outdoor density of the vector. This combination of rodenticide-insecticide could be a suitable alternative for zinc phosphide while bait shyness or behavioral resistance is occurred.
Collapse
Affiliation(s)
- A Veysi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - H Vatandoost
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - MR Yaghoobi-Ershadi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - MH Arandian
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - R Jafari
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - M Hosseini
- Department of Epidemiology and biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - H abdoli
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - Y Rassi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - K Heidari
- Esfahan Health Center, Esfahan University of Medical Sciences, Esfahan, Iran
| | - A Sadjadi
- Esfahan Health Center, Esfahan University of Medical Sciences, Esfahan, Iran
| | - R Fadaei
- Esfahan Health Center, Esfahan University of Medical Sciences, Esfahan, Iran
| | - J Ramazanpour
- Esfahan Health Center, Esfahan University of Medical Sciences, Esfahan, Iran
| | - K Aminian
- Esfahan Health Center, Esfahan University of Medical Sciences, Esfahan, Iran
| | - MR Shirzadi
- Department of Zoonosis, CDC, Ministry of Health and Medical Education, Tehran, Iran
| | - AA Akhavan
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran,Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran,Corresponding author: Dr Amir Ahmad Akhavan, E-mail:
| |
Collapse
|
30
|
Jafari R, Tatoulian M, Arefi-Khonsari F. Improvement of the stability of plasma polymerized acrylic acid coating deposited on PS beads in a fluidized bed reactor. REACT FUNCT POLYM 2011. [DOI: 10.1016/j.reactfunctpolym.2011.01.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
31
|
Akhavan AA, Yaghoobi-Ershadi MR, Khamesipour A, Mirhendi H, Alimohammadian MH, Rassi Y, Arandian MH, Jafari R, Abdoli H, Shareghi N, Ghanei M, Jalali-zand N. Dynamics of Leishmania infection rates in Rhombomys opimus (Rodentia: Gerbillinae) population of an endemic focus of zoonotic cutaneous leishmaniasis in Iran. ACTA ACUST UNITED AC 2010; 103:84-9. [PMID: 20390397 DOI: 10.1007/s13149-010-0044-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2009] [Accepted: 12/23/2009] [Indexed: 10/19/2022]
Abstract
Zoonotic cutaneous leishmaniasis (ZCL) due to Leishmania major is a great public health problem in the Old World. Leishmania major is widely distributed in populations of rodents in arid and savannah regions. In this study, seasonal variation of natural infection with Leishmania parasites in Rhombomys opimus (Rodentia: Gerbillinae) population of an endemic focus of ZCL in Iran was monitored. The study was conducted from October 2007 to October 2008 in the central part of the country. Nested polymerase chain reaction (PCR) assay was used for the detection and identification of Leishmania parasites, and the results were confirmed by PCR-restriction fragment length polymorphism (RFLP). The results showed that Leishmania infection rate was 55.8% (29 out of 52 gerbils) using nested PCR. The highest and lowest Leishmania infection rates were observed in fall and summer, respectively. Gerbils that were found to be infected only with L. major were 5.8%, and that with Leishmania turanica were 23.1%. A mixed natural infection was seen in the rodents with L. major and L. turanica (21.2%), with L. major and L. gerbilli (1.9%), and with all the three species (3.9%). Leishmania major infection alone was seen in fall and winter whereas mixed infection of L. major and L. turanica was observed in all seasons except in summer. Leishmania turanica infection was observed throughout the year. It is concluded that L. major, L. gerbilli, and L. turanica circulate in the population of R. opimus in central part of Iran. Leishmania major infection is usually accompanied by L. turanica in naturally infected gerbils with the highest rate in fall. It is recommended that the role of L. turanica in the epidemiology and transmission of ZCL should be reconsidered.
Collapse
Affiliation(s)
- A A Akhavan
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Akhavan AA, Yaghoobi-Ershadi MR, Mirhendi H, Alimohammadian MH, Rassi Y, Shareghi N, Jafari R, Arandian MH, Abdoli H, Ghanei M, Jalali-zand N, Khamesipour A. Molecular epizootiology of rodent leishmaniasis in a hyperendemic area of iran. Iran J Public Health 2010; 39:1-7. [PMID: 23112983 PMCID: PMC3468974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 02/11/2010] [Indexed: 11/16/2022]
Abstract
BACKGROUND Zoonotic cutaneous leishmaniasis (ZCL) is an expanding disease and public health problem in Iran. In the current study, natural Leishmania infection rate and seasonal fluctuation of the infection in Rhombomys opimus population of a hyperendemic focus of ZCL in Iran was investigated. METHODS The study was conducted from October 2006 to October 2008 in Esfahan Province, central part of Iran. An extensive sampling of rodents using Sherman traps was done in different seasons. Nested PCR assay was used for detection and identification of Leishmania species and the results were confirmed using PCR-RFLP. RESULTS Leishmania infection rate was 58.6% (34 of 58) using nested PCR. 44.8% of the gerbils were infected only with L. turanica and 1.7% with L. gerbilli alone. A mixed natural infection with L. major and L. turanica was seen in 12.1% of the rodents. L. major infection alone was not seen in R. opimus population in the study area. The highest and lowest Leishmania infection rates were observed in fall and spring respectively. L. turanica infection was observed throughout the year whereas mixed infections with L. major and L. turanica was not seen in spring. CONCLUSION It is concluded that in the study area, L. major, L. gerbilli and L. turanica circulate in the population of R. opimus. Leishmania major infection usually accompanied by L. turanica in naturally infected gerbils with the highest rate in fall. It is recommended that the role of L. turanica in the epidemiology and transmission of ZCL be revisited.
Collapse
Affiliation(s)
- AA Akhavan
- Dept. of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - MR Yaghoobi-Ershadi
- Dept. of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - H Mirhendi
- Dept. of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Iran
| | | | - Y Rassi
- Dept. of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Iran
| | - N Shareghi
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - R Jafari
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - MH Arandian
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - H Abdoli
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - M Ghanei
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - N Jalali-zand
- Esfahan Training and Health Research Center, National Institute of Health Research, Tehran University of Medical Sciences, Esfahan, Iran
| | - A Khamesipour
- Center for Research and Training in Skin diseases and Leprosy, Tehran University of Medical Sciences, Iran
| |
Collapse
|
33
|
Ghasemzadeh H, Loseu V, Jafari R. Structural Action Recognition in Body Sensor Networks: Distributed Classification Based on String Matching. ACTA ACUST UNITED AC 2010; 14:425-35. [DOI: 10.1109/titb.2009.2036722] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
34
|
Moin-Vaziri V, Depaquit J, Yaghoobi-Ershadi MR, Oshaghi MA, Derakhshandeh-Peykar P, Ferte H, Kaltenbach M, Bargues MD, Nadim A, Javadian E, Rassi Y, Jafari R. Geographical variation in populations of Phlebotomus (Paraphlebotomus) caucasicus (Diptera: Psychodidae) in Iran. Bull Soc Pathol Exot 2007; 100:291-295. [PMID: 17982863] [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: 05/25/2023]
Abstract
A comparative morphological and molecular study was carried out on 11 different populations of Phlebotomus (Paraphlebotomus) caucasicus Marzinovsky 1917 caught in 7 provinces in Iran (2004-2005). Differences in the implantation level of the two distal spines of the style, the number of setae of the basal lobe of coxite, and the length of the third antennal segment, revealed the existence of two morphotypes within P. (Pa) caucasicus, a species having a confused history if we take into account an unclear synonymisation with Phlebotomus (Paraphlebotomus) grimmi Porchinsky 1874. Sequencing of mtDNA (a fragment of cytchromeB gene, tRNA for serine gene and a fragment of NADH1 gene) and Neighbour-Joining analysis showed a partial correlation between morphotypes and haplotypes. We also found a correlation between the latter and the geographical origin of the specimens. These results need further studies in order to appreciate the role of each morphotype/haplotype in the transmission of Leishmania major.
Collapse
Affiliation(s)
- V Moin-Vaziri
- Department of medical entomology and vector control, School of public health and Institute of public health research, Medical Sciences/University of Tehran, P.O. Box 6446-14155, Tehran, Iran
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Jafari R, Lewis MM, Ostendorf B. Evaluation of vegetation indices for assessing vegetation cover in southern arid lands in South Australia. Rangel J 2007. [DOI: 10.1071/rj06033] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Vegetation indices are widely used for assessing and monitoring ecological variables such as vegetation cover, above-ground biomass and leaf area index. This study reviewed and evaluated different groups of vegetation indices for estimating vegetation cover in southern rangelands in South Australia. Slope-based, distance-based, orthogonal transformation and plant-water sensitive vegetation indices were calculated from Landsat thematic mapper (TM) image data and compared with vegetation cover estimates at monitoring points made during Pastoral Lease assessments. Relationships between various vegetation indices and vegetation cover were compared using simple linear regression at two different scales: within two contrasting land systems and across broader regional landscapes. Of the vegetation indices evaluated, stress related vegetation indices using red, near-infrared and mid-infrared TM bands consistently showed significant relationships with vegetation cover at both land system and landscape scales. Estimation of vegetation cover was more accurate within land systems than across broader regions. Total perennial and ephemeral plant cover was best predicted within land systems, while combined vegetation, plant litter and soil cryptogam crust cover was best predicted at landscape scale. These results provide a strong foundation for use of vegetation indices as an adjunct to field methods for assessing vegetation cover in southern Australia.
Collapse
|
36
|
Hanafi-Bojd AA, Vatandoost H, Jafari R. Susceptibility status of Anopheles dthali and An. fluviatilis to commonly used larvicides in an endemic focus of malaria, southern Iran. J Vector Borne Dis 2006; 43:34-8. [PMID: 16642784] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023] Open
Affiliation(s)
- A A Hanafi-Bojd
- Department of Medical Entomology & Vector Control, School of Public Health & Institute of Health Research, Tehran University of Medical Sciences, P.O. Box 6446, Tehran 14155, Iran
| | | | | |
Collapse
|
37
|
|
38
|
Yaghoobi-Ershadi MR, Akhavan AA, Abai MR, Ebrahimi B, Zahraei-Ramazani AR, Vafaei-Nezhad R, Hanafi-Bojd AA, Jafari R. Epidemiological study in a new focus of cutaneous leishmaniasis in the Islamic Republic of Iran. East Mediterr Health J 2004; 10:688. [PMID: 16335665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
|
39
|
Jafari R, Sotudeh-Gharebagh R, Mostoufi N. Modular Simulation of Fluidized Bed Reactors (Chem. Eng. Technol. 2004, 27, 123). Chem Eng Technol 2004. [DOI: 10.1002/ceat.200490007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
40
|
|
41
|
Yaghoobi Ershadi MR, Akhavan AA, Zahraei Ramazani AV, Abai MR, Ebrahimi B, Vafaei Nezhad R, Hanafi Bojd AA, Jafari R. Epidemiological study in a new focus of cutaneous leishmaniasis in the Islamic Republic of Iran. East Mediterr Health J 2003. [DOI: 10.26719/2003.9.4.816] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An outbreak of cutaneous leishmaniasis [CL] in Sabzevar county prompted this study of the epidemiology and the ecology of vectors and reservoirs. Examination of 541 schoolchildren showed rates of 9.4% for scars and 5.9% for ulcers. Among 807 inhabitants of 4 villages, 10.4% had scars and 3.0% had active lesions. The most highly infected age group was 0-4 years with a rate of 5.9%. A total of 12 849 sandflies representing 7 species were collected in the study area. Leptomonad infection was found in Phlebotomus papatasi, P. caucasicus and Sergentomyia sintoni. Parasites from man, P. papatasi and Rhombomys opimus, were isolated and characterized as Leishmania major. Based on this survey, this is an epidemic of zoonotic CL, with R. opimus the main reservoir host, and P. papatasi the main vector
Collapse
|
42
|
Yaghoobi-Ershadi MR, Akhavan AA, Zahraei-Ramazani AV, Abai MR, Ebrahimi B, Vafaei-Nezhad R, Hanafi-Bojd AA, Jafari R. Epidemiological study in a new focus of cutaneous leishmaniasis in the Islamic Republic of Iran. East Mediterr Health J 2003; 9:816-26. [PMID: 15748078] [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: 05/02/2023]
Abstract
An outbreak of cutaneous leishmaniasis (CL) in Sabzevar county prompted this study of the epidemiology and the ecology of vectors and reservoirs. Examination of 541 schoolchildren showed rates of 9.4% for scars and 5.9% for ulcers. Among 807 inhabitants of 4 villages, 10.4% had scars and 3.0% had active lesions. The most highly infected age group was 0-4 years with a rate of 5.9%. A total of 12 849 sandflies representing 7 species were collected in the study area. Leptomonad infection was found in Phlebotomus papatasi, P. caucasicus and Sergentomyia sintoni. Parasites from man, P. papatasi and Rhombomys opimus, were isolated and characterized as Leishmania major. Based on this survey, this is an epidemic of zoonotic CL, with R. opimus the main reservoir host, and P. papatasi the main vector.
Collapse
Affiliation(s)
- M R Yaghoobi-Ershadi
- School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, Islamic Republic of Iran
| | | | | | | | | | | | | | | |
Collapse
|
43
|
Abstract
This paper examined the psychological aspects of failing to conceive with in vitro fertilization on 14 treated infertile and 14 untreated Iranian patients. Analysis suggests that, although a significant amount of psychological discomfort is associated with being infertile, the fact that patients have endured unsuccessful treatment cycles does not seem to aggravate the situation any further. Perhaps undergoing unsuccessful IVF treatment cycles could be a psychologically positive epilogue in closing the book on infertility treatment.
Collapse
Affiliation(s)
- B Baluch
- Faculty of Health Care and Social Studies, Luton College of Higher Education, Bedfordshire, England
| | | | | | | |
Collapse
|
44
|
Gharagozloo RA, Margolis E, Marcus H, Ala AP, Jafari R, Nezam H. Streptococcal infection, rheumatic fever and rheumatic heart disease among 500 Jewish school schildren in Teheran. Isr J Med Sci 1972; 8:18-21. [PMID: 4554754] [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: 01/11/2023]
|