1
|
Farzin M, Babaei P, Rostampour M. Intrahippocampal Injections of Ghrelin and Aerobic Physical Exercise: Effects on Learning and Passive Avoidance Memory in Rats. NEUROPHYSIOLOGY+ 2021. [DOI: 10.1007/s11062-021-09912-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
2
|
Chan N, Farzin M, McLeod D. Colorectal neuroendocrine carcinoma with squamous cell differentiation: a rare and unusual tumour. Pathology 2021. [DOI: 10.1016/j.pathol.2021.05.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
3
|
Tegaw EM, Geraily G, Etesami SM, Gholami S, Ghanbari H, Farzin M, Tadesse GF, Shojaei M. A Comparison between Electron Gamma Shower, National Research Council/Easy Particle Propagation (EGSnrc/Epp) and Monte Carlo N-Particle Transport Code (MCNP) in Simulation of the INTRABEAM ® System with Spherical Applicators. J Biomed Phys Eng 2021; 11:47-54. [PMID: 33564639 PMCID: PMC7859382 DOI: 10.31661/jbpe.v0i0.2008-1171] [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: 08/31/2020] [Accepted: 10/05/2020] [Indexed: 06/12/2023]
Abstract
BACKGROUND Online Monte Carlo (MC) treatment planning is very crucial to increase the precision of intraoperative radiotherapy (IORT). However, the performance of MC methods depends on the geometries and energies used for the problem under study. OBJECTIVE This study aimed to compare the performance of MC N-Particle Transport Code version 4c (MCNP4c) and Electron Gamma Shower, National Research Council/easy particle propagation (EGSnrc/Epp) MC codes using similar geometry of an INTRABEAM® system. MATERIAL AND METHODS This simulation study was done by increasing the number of particles and compared the performance of MCNP4c and EGSnrc/Epp simulations using an INTRABEAM® system with 1.5 and 5 cm diameter spherical applicators. A comparison of these two codes was done using simulation time, statistical uncertainty, and relative depth-dose values obtained after doing the simulation by each MC code. RESULTS The statistical uncertainties for the MCNP4c and EGSnrc/Epp MC codes were below 2% and 0.5%, respectively. 1e9 particles were simulated in 117.89 hours using MCNP4c but a much greater number of particles (5e10 particles) were simulated in a shorter time of 90.26 hours using EGSnrc/Epp MC code. No significant deviations were found in the calculated relative depth-dose values for both in the presence and absence of an air gap between MCNP4c and EGSnrc/Epp MC codes. Nevertheless, the EGSnrc/Epp MC code was found to be speedier and more efficient to achieve accurate statistical precision than MCNP4c. CONCLUSION Therefore, in all comparisons criteria used, EGSnrc/Epp MC code is much better than MCNP4c MC code for simulating an INTRABEAM® system.
Collapse
Affiliation(s)
- E. M. Tegaw
- PhD, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, International Campus (TUMS-IC), Tehran, Iran
- PhD, Department of Physics, Faculty of Natural and Computational Sciences, Debre Tabor University, Debre Tabor, Ethiopia
| | - Gh. Geraily
- PhD, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, International Campus (TUMS-IC), Tehran, Iran
- PhD, Radiation Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - S. M. Etesami
- PhD, School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran
| | - S. Gholami
- PhD, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, International Campus (TUMS-IC), Tehran, Iran
- PhD, Radiation Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - H. Ghanbari
- PhD, Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - M. Farzin
- PhD, Radiation Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran
- PhD, Brain and Spinal Cord Injury Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - G. F. Tadesse
- PhD, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, International Campus (TUMS-IC), Tehran, Iran
- PhD, Department of Physics, College of Natural and Computational Sciences, Aksum University, Ethiopia
| | - M. Shojaei
- PhD, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, International Campus (TUMS-IC), Tehran, Iran
| |
Collapse
|
4
|
Salehi A, Farzin M, Alizadeh SH. Determination of Effective Factors on Natural Regeneration of Persian Oak in Kohgiluyeh and Boyer-Ahmad, Sothern Zagros, Iran. Arid Ecosyst 2019. [DOI: 10.1134/s2079096119030107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
5
|
Farzin M, Molls M, Astner S, Reitz S, Kreiser K, Kampfer S. EP-1113: Light seeing in radiotherapy of patients with brain tumours and head and neck malignancies. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32363-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Ahmadi F, Farzin M, Mandegari M. Effect of grain size on ultrasonic softening of pure aluminum. Ultrasonics 2015; 63:111-117. [PMID: 26141944 DOI: 10.1016/j.ultras.2015.06.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 05/08/2015] [Accepted: 06/21/2015] [Indexed: 06/04/2023]
Abstract
The objective of this paper is to reveal the main cause of volume effects of ultrasonic vibrations on the plastic behavior of pure aluminum specimens. For this purpose, specimens with different grain sizes were made by ECAP. An experimental tensile test system was designed and made, in which the specimens could be excited by ultrasonic vibrations with a frequency of 20 kHz and amplitude of 5 μm. Five specimens with grain sizes of 109, 38, 15, 7 and 0.97 μm were prepared. Tensile tests of the specimens were performed at room temperature and at constant speed of 0.2 mm/min under static load and superimposed ultrasonic excitations. It was found that ultrasonic vibrations had a remarkable influence on the plastic behavior of pure aluminum and after applying ultrasonic vibrations, flow stress of the all specimens reduced. Reduction of flow stress was dependent on grain size. The specimens with the largest grain size of 109 μm showed a flow stress reduction of 66% while finest grain size of 0.97 μm, a reduction of 11.3% was observed. The result of the current study can help to understand the underlying mechanisms of ultrasonic softening.
Collapse
Affiliation(s)
- F Ahmadi
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156 83111, Iran.
| | - M Farzin
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156 83111, Iran.
| | - M Mandegari
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156 83111, Iran.
| |
Collapse
|
7
|
Farzin M, Bahrani F, Adelpour E. Comparison of the Effect of two Denture Cleansers on Tensile bond Strength of a Denture Liner. J Dent (Shiraz) 2013; 14:130-5. [PMID: 24724134 PMCID: PMC3927681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
STATEMENT OF PROBLEM One of the most clinical challenging issues in prosthodontics is debonding of soft liners from the denture base. PURPOSE The aim of this study was to evaluate and compare tensile bond strength between soft liner and heat-cured acrylic resin when immersed in two different types of denture cleanser and distilled water, at different period of times. MATERIALS AND METHOD In this experimental in vivo study, 238 heat-cured acrylic blocks were made. A soft liner was embedded between the acrylic blocks. Samples were divided into four groups: 17 samples were in the control group and were not soaked in any solution .The remaining samples were divided into 3 groups (Distilled water, Calgon and Fittydent). Each group was then subdivided into two subcategories, regarding the immersion time variable; 15 and 45 minutes. All samples were placed in tension force and tensile bond strength was recorded with the testing machine. One- way ANOVA and Tucky HSD post-hoc test were adopted to analyze the yielded data (α> 0.05). RESULTS Specimens which were immersed in two denture cleansers (Fittydent and Calgon) and in distilled water showed significant difference (p= 0.001) in bonding strength when compared to the control group. The subjects immersed in denture cleanser solutions and distilled water did not reveal any significant difference (p= 0.90). For all groups; most of the bonding failures (72%) were cohesive type. CONCLUSION The effect of the denture cleansers and distilled water on the bond strength was not statistically different; however, the difference was significant between the immersed groups with the non-immersed group. Moreover, type of the denture cleanser did not show any effect on the tensile strength. The tensile strength increases with time of immersion.
Collapse
Affiliation(s)
- M Farzin
- Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - F Bahrani
- Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | | |
Collapse
|
8
|
Cooper WA, Yu B, Yip PY, Ng CC, Lum T, Farzin M, Trent RJ, Mercorella B, Clarkson A, Kohonen-Corish MRJ, Horvath LG, Kench JG, McCaughan B, Gill AJ, O'Toole SA. EGFR mutant-specific immunohistochemistry has high specificity and sensitivity for detecting targeted activating EGFR mutations in lung adenocarcinoma. J Clin Pathol 2013; 66:744-8. [PMID: 23757037 DOI: 10.1136/jclinpath-2013-201607] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIM We assessed the diagnostic accuracy of epidermal growth factor receptor (EGFR) mutant-specific antibodies for detecting two common activating EGFR mutations. METHODS Immunohistochemical expression of mutation-specific antibodies against EGFR exon 19 deletion E746-A750 ((c.2235_2249del15 or c.2236_2250del15, p. Glu746_Ala750del) and exon 21 L858R point mutation (c.2573T>G, p.Leu858Arg) were assessed in a cohort of 204 resected early stage node negative lung adenocarcinomas, and protein expression was compared with DNA analysis results from mass spectrometry analysis. RESULTS Of seven cases with L858R point mutation, six were positive by immunohistochemistry (IHC). There were three false positive cases using L858R IHC (sensitivity 85.7%, specificity 98.5%, positive predictive value 66.7%, negative predictive value 99.5%). All seven E746-A750 exon 19 deletions identified by mutation analysis were positive by IHC. Four additional cases were positive for exon 19 IHC but negative by mutation analysis. The sensitivity of exon 19 IHC for E746-A750 was 100%, specificity 98.0%, positive predictive value 63.6% and negative predictive value 100%. CONCLUSIONS Mutant-specific EGFR IHC has good specificity and sensitivity for identifying targeted activating EGFR mutations. Although inferior to molecular genetic analysis of the EGFR gene, IHC is highly specific and sensitive for the targeted EGFR mutations. The antibodies are likely to be of clinical value in cases where limited tumour material is available, or in situations where molecular genetic analysis is not readily available.
Collapse
Affiliation(s)
- W A Cooper
- Department of Tissue Pathology and Diagnostic Oncology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Farzin M, Mardani M, Ghabanchi J, Fattahi MJ, Rezaee M, Heydari ST, Andisheh Tadbir A. Serum level of matrix metalloproteinase-3 in patients with oral lichen planus. Iran Red Crescent Med J 2012; 14:10-3. [PMID: 22737547 PMCID: PMC3372021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Accepted: 10/10/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND Oral Lichen planus (OLP) is a chronic lesion of the oral mucosa with unknown origin. Basement membrane changes are common in OLP and may be mediated by proteases such as matrix metalloproteinase (MMPs) and mast cell chymase. The aim of our study was to evaluate the level of serum MMP-3 in OLP com-pared to normal individuals and assess its clinical significance. METHODS Thirty four serum samples from patients diagnosed with OLP (12 males, 22 females, age: 42.2±10.8 years) and 34 serum samples from healthy control subjects (11 males, 23 females, age: 42.5±13.3 years) were collected and MMP-3 concentration was measured by ELISA. RESULTS The serum MMP-3 level in OLP patients was higher (21.64±24.31 ng/ml) compared with healthy con-trols (16.52±23.63 ng/ml), but showed no statistically significant difference. A statistically significant difference was demonstrated between the two types of OLP, being more pronounced in the erosive/atrophic form 6). CONCLUSION The different clinical appearances of OLP are associated with significant differences in MMP-3 serum level.
Collapse
Affiliation(s)
- M Farzin
- Department of Prosthodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - M Mardani
- Department of Oral Medicine, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - J Ghabanchi
- Department of Oral Medicine, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - M J Fattahi
- Shiraz Institute for Cancer Research Shiraz University of Medical Sciences, Shiraz, Iran
| | - M Rezaee
- Department of Oral Medicine, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - S T Heydari
- Health Policy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - A Andisheh Tadbir
- Department of Oral Pathology, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran,Correspondence: Azadeh Andisheh Tadbir, DMD, MSc, Department of Oral Pathology, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran. Tel.: +98-711-6263193-4, Fax: +98-711-6270325, E-mail:
| |
Collapse
|
10
|
Farzin M, Panahandeh H. Effect of pouring time and storage temperature on dimensional stability of casts made from irreversible hydrocolloid. J Dent (Tehran) 2010; 7:179-84. [PMID: 21998793 PMCID: PMC3184758] [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: 02/28/2010] [Accepted: 06/01/2010] [Indexed: 11/02/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the dimensional stability of casts made from an alginate impression material poured immediately and stored after specific periods. MATERIALS AND METHODS The common alginate used in Iran (Super; Iralgin, Golchai Co., Tehran, Iran) was tested. A master model was mounted on a special device and used to obtain the impressions. These impressions were stored at 23°C (SD=1) and 4°C (SD=1) in 100% relative humidity, then poured with gypsum immediately and again after 12, 25, 45 and 60 minutes. The casts were measured with a traveling microscope with the precision of 0.5 micrometer. RESULTS The dimensional stability of the alginate and impressions were both significantly time and temperature dependent. The impressions were dimensionally stable significantly until 12 minutes of storage at room temperature and until 45 minutes of storage at 4°C (SD=1). CONCLUSION The dimensional stability of the alginate impressions was influenced by the storage time and environment temperature, but a humid environment and 4°C (SD=1) temperature may delay the pouring.
Collapse
Affiliation(s)
- M. Farzin
- Assistant Professor, Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran,Corresponding author: M. Farzin, Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
| | | |
Collapse
|
11
|
Hurt CR, Farzin M, Hedrick PW. Premating, not postmating, barriers drive genetic dynamics in experimental hybrid populations of the endangered Sonoran topminnow. Genetics 2005; 171:655-62. [PMID: 15972455 PMCID: PMC1456797 DOI: 10.1534/genetics.105.045591] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The timing and pattern of reproductive barrier formation in allopatric populations has received much less attention than the accumulation of reproductive barriers in sympatry. The theory of allopatric speciation suggests that reproductive barriers evolve simply as by-products of overall genetic divergence. However, observations of enhanced premating barriers in allopatric populations suggest that sexual selection driven by intraspecific competition for mates may enhance species-specific signals and accelerate the speciation process. In a previous series of laboratory trials, we examined the strength of premating and postmating barriers in an allopatric species pair of the endangered Sonoran topminnow, Poeciliopsis occidentalis and P. sonoriensis. Behavioral observations provided evidence of asymmetrical assortative mating, while reduced brood sizes and male-biased F(1) sex ratios suggest postmating incompatibilities. Here we examine the combined effects of premating and postmating barriers on the genetic makeup of mixed populations, using cytonuclear genotype frequencies of first- and second-generation offspring. Observed genotype frequencies strongly reflect the directional assortative mating observed in behavioral trials, illustrating how isolating barriers that act earlier in the reproductive cycle will have a greater effect on total reproductive isolation and may be more important to speciation than subsequent postmating reproductive barriers.
Collapse
Affiliation(s)
- C R Hurt
- School of Life Sciences, Arizona State University, Tempe, 82587-4501, USA.
| | | | | |
Collapse
|