Publications by authors named "Mohammad Montazeri"

28 Publications

  • Page 1 of 1

White blood cell count and clustered components of metabolic syndrome: A study in western Iran.

Caspian J Intern Med 2021 ;12(1):59-64

Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.

Background: White blood cell count (WBC) is one of the objective parameters of systemic inflammation. The aim of present study was to evaluate the relationship between WBC count and metabolic syndrome.

Methods: In this study on Lor population in Borujerd province (West of Iran), from 2011 to 2013, 800 persons were enrolled. MetS was defined based on ATP III criteria. Differences among the quartiles of WBC were examined by one-way analysis of variance.

Results: Only 14.7% did not have any of the five components and 43% of all subjects had metabolic syndrome. The means of WBC count in MetS group were significantly higher than the control group (p<0.0001). In subjects without any MetS components, the means of WBC was 5.321 /µL, and it was 5.664, 5.714, 5.961, 6.302, and 6.572 /µL in subjects with 1, 2, 3, 4, and 5 components, respectively. These differences show a significant increasing trend (p<0.0001).

Conclusion: WBC count was associated with clustered components of metabolic syndrome. It seems that WBC counts could be considered as a predictive factor for metabolic syndrome in preventive medicine.
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http://dx.doi.org/10.22088/cjim.12.1.59DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7919179PMC
January 2021

Neurons and astrocytes interaction in neuronal network: A game-theoretic approach.

J Theor Biol 2019 06 9;470:76-89. Epub 2019 Mar 9.

Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran. Electronic address:

A neuron is the fundamental unit of the nervous system and the brain, crucial for transducing information in form of trains of electrical pulses known as action potentials. The connection between neurons is through synapses, enabling communication between neurons. This communication link is one of the key elements in processing of information from a neuron to another neuron. The strength of the synapses may vary over time, a phenomenon known as synaptic plasticity. This is the process by which it is believed memory and learning is governed. Recent studies revealed environmental factors affect the strength of synapses, and the way neurons communicate to each other. This poses the question as to what extent the pre- and post- synaptic neurons sense the environmental changes, and in turn adjust their synaptic link. Here, we model the behavior of an interconnected neuronal network in various environmental conditions as a multi-agent system in a game theoretic framework. We focus on a CA1 lattice subfield as an example plastic neuronal network. Our analysis revealed the neuronal network converges to different equilibria depending on the environmental changes. The model well-predicts the behavior of the network compared to a well-known theoretical model of individual neurons.
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http://dx.doi.org/10.1016/j.jtbi.2019.02.024DOI Listing
June 2019

Blunted Overnight Blood Pressure Dipping in Second Trimester; A Strong Predictor of Gestational Hypertension and Preeclampsia.

Curr Hypertens Rev 2019 ;15(1):70-75

Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.

Background: Preeclampsia is a global burden with 10 million incidences annually and 210 daily deaths worldwide. Diagnosis is mainly based on the features following full presentation.

Objective: This study explored whether early pregnancy circadian changes of ambulatory blood pressure monitoring (ABPM) could predict preeclampsia and hypertension.

Methods: In a prospective study, 294 pregnant women who were referred to Sarem Women's Hospital, Iran were recruited. Systolic, diastolic and mean arterial pressures (MAP) were recorded (diurnally and nocturnally) in each trimester. Dipping was defined as a minimum 10% decrease in blood pressure.

Results: Of the 251 women who completed the study, 25 percent (n=63) experienced blunted MAP dipping during sleep phases in the second trimester. Eighty-nine percent (n=56) experienced hypertensive disorder in the third trimester, one-third of which experienced preeclampsia. Of the women with normal MAP dipping (n=188), 5 percent (n=10) had gestational hypertension and 1 percent (n=2) became preeclamptic. (P<0.0001).

Conclusion: This study clearly demonstrated blunted blood pressure dipping overnight during the second trimester which is a strong predictor of forthcoming pregnancy-induced hypertension and preeclampsia. A scoring system was developed to predict hypertensive disorder and it was significantly correlated with preeclampsia occurrence.
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http://dx.doi.org/10.2174/1573402114666180924143801DOI Listing
August 2019

Tailoring exchange couplings in magnetic topological-insulator/antiferromagnet heterostructures.

Nat Mater 2017 01 31;16(1):94-100. Epub 2016 Oct 31.

Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

Magnetic topological insulators such as Cr-doped (Bi,Sb)Te provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures exhibiting Néel order in an antiferromagnetic CrSb and ferromagnetic order in Cr-doped (Bi,Sb)Te, we realize emergent interfacial magnetic phenomena which can be tailored through artificial structural engineering. Through deliberate geometrical design of heterostructures and superlattices, we demonstrate the use of antiferromagnetic exchange coupling in manipulating the magnetic properties of magnetic topological insulators. Proximity effects are shown to induce an interfacial spin texture modulation and establish an effective long-range exchange coupling mediated by antiferromagnetism, which significantly enhances the magnetic ordering temperature in the superlattice. This work provides a new framework on integrating topological insulators with antiferromagnetic materials and unveils new avenues towards dissipationless topological antiferromagnetic spintronics.
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http://dx.doi.org/10.1038/nmat4783DOI Listing
January 2017

Hyperprolactinemia and Hirsutism in Patients Without Polycystic Ovary Syndrome.

Int J Trichology 2016 Jul-Sep;8(3):130-4

Young Researchers Club, Islamic Azad University, Babol Branch, Babol, Iran.

Background: Hirsutism is one of the most important diseases that lead women to refer to dermatology clinic. Hyperprolactinemia is one of the causes of hirsutism. The aim of this study was to determine prolactin (PRL) levels in hirsute women.

Materials And Methods: In this cross-sectional study, hirsute patients were evaluated. For all of the patients, 2 or 3 days after mense starting, hormone level tests were performed, and 200 patients that had not polycystic ovary syndrome enrolled to the study. A questionnaire of history and physical examination were performed. Data have been analyzed with SPSS version 21.

Results: Hyperprolactinemia were seen in 25 patients (12.5%). There was no significant relation between marital statuses, galactorrhoea, positive family history, and infertility with hyperprolactinemia. But significant relation was seen between irregular mense and hyperprolactinemia.

Conclusion: Although hyperprolactinemia is the rare cause of hirsutism, the prevalence of hyperprolactinemia was high in our study. Thus, PRL level in hirsute patients should be evaluate.
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http://dx.doi.org/10.4103/0974-7753.188998DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5007919PMC
September 2016

Competing effect of spin-orbit torque terms on perpendicular magnetization switching in structures with multiple inversion asymmetries.

Sci Rep 2016 Apr 6;6:23956. Epub 2016 Apr 6.

Department of Electrical Engineering, University of California, Los Angeles, California 90095, United States.

Current-induced spin-orbit torques (SOTs) in structurally asymmetric multilayers have been used to efficiently manipulate magnetization. In a structure with vertical symmetry breaking, a damping-like SOT can deterministically switch a perpendicular magnet, provided an in-plane magnetic field is applied. Recently, it has been further demonstrated that the in-plane magnetic field can be eliminated by introducing a new type of perpendicular field-like SOT via incorporating a lateral structural asymmetry into the device. Typically, however, when a current is applied to such devices with combined vertical and lateral asymmetries, both the perpendicular field-like torque and the damping-like torque coexist, hence jointly affecting the magnetization switching behavior. Here, we study perpendicular magnetization switching driven by the combination of the perpendicular field-like and the damping-like SOTs, which exhibits deterministic switching mediated through domain wall propagation. It is demonstrated that the role of the damping-like SOT in the deterministic switching is highly dependent on the magnetization direction in the domain wall. By contrast, the perpendicular field-like SOT is solely determined by the relative orientation between the lateral structural asymmetry and the current direction, regardless of the magnetization direction in the domain wall. The experimental results further the understanding of SOTs-induced switching, with implications for spintronic devices.
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http://dx.doi.org/10.1038/srep23956DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4822117PMC
April 2016

Retinopathy of Prematurity in Neonates and its Risk Factors: A Seven Year Study in Northern Iran.

Open Ophthalmol J 2016 29;10:17-21. Epub 2016 Feb 29.

Young Researchers Club, Islamic Azad University, Babol branch, Babol, Iran.

Purpose: An important cause of avoidable childhood blindness is retinopathy of prematurity (ROP) in countries with high human development index and also in some emerging economies countries. To date, no research have been conducted on analyzing data of ROP prevalence in Babol, and this is the first research performed on ROP in this area.

Methods: All VLBW babies who referred to Babol ophthalmology center over the seven years, from February 2007 to December 2013 were enrolled in this descriptive cross-sectional research. A team of researchers recorded patients' information completely in check lists. A single experienced ophthalmologist performed ophthalmologic examination of patients.

Result: The incidence of ROP of any stage in Babol was determined to be 306 (45%) of all babies enrolled in this study. In present study, key risk factors of ROP were low gestational age, oxygen therapy more than five days and low birth weight.

Conclusion: The findings of current study demonstrate that the main risk factors of developing ROP in newborns are multiple gestation, low birth weight, oxygen therapy for more than five day. Therefore, the progression of ROP to blindness will be prevented by a high index of suspicion, suitable screening, prompt diagnosis, and early treatment.
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http://dx.doi.org/10.2174/1874364101610010017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4780469PMC
March 2016

Clinical Presentation and Antibiotic Susceptibility of Contact Lens Associated Microbial Keratitis.

J Pathog 2015 3;2015:152767. Epub 2015 Dec 3.

Young Researchers Club, Islamic Azad University, Babol Branch, Babol, Iran.

Introduction. In recent years, the number of contact lens wearers has dramatically increased in Iran, particularly in youngsters. The purpose of current study was to assess the clinical presentation and antibiotic susceptibility of contact lens related microbial keratitis in Ahvaz, southwest of Iran. Methodology. A cross-sectional investigation of 26 patients (33 eyes) with contact lens induced corneal ulcers who were admitted to Imam Khomeini Hospital, Ahwaz City, from June 2012 to June 2013 was done. In order to study microbial culture and susceptibility of corneal ulcers, all of them were scraped. Results. Eight samples were reported as sterile. Pseudomonas aeruginosa (80%) in positive cultures was the most widely recognized causative organism isolated. This is followed by Staphylococcus aureus 12% and Enterobacter 8%. The results showed that 84% of the microorganism cases were sensitive to ciprofloxacin, while imipenem, meropenem, and ceftazidime were the second most effective antibiotics (76%). Conclusion. Results of current study show the importance of referring all contact lens wearers with suspected corneal infection to ophthalmologists for more cure. The corneal scraping culture and contact lens solution should be performed to guide antibiotic therapy.
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http://dx.doi.org/10.1155/2015/152767DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4681797PMC
January 2016

Electric-field control of spin-orbit torque in a magnetically doped topological insulator.

Nat Nanotechnol 2016 Apr 4;11(4):352-9. Epub 2016 Jan 4.

Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

Electric-field manipulation of magnetic order has proved of both fundamental and technological importance in spintronic devices. So far, electric-field control of ferromagnetism, magnetization and magnetic anisotropy has been explored in various magnetic materials, but the efficient electric-field control of spin-orbit torque (SOT) still remains elusive. Here, we report the effective electric-field control of a giant SOT in a Cr-doped topological insulator (TI) thin film using a top-gate field-effect transistor structure. The SOT strength can be modulated by a factor of four within the accessible gate voltage range, and it shows strong correlation with the spin-polarized surface current in the film. Furthermore, we demonstrate the magnetization switching by scanning gate voltage with constant current and in-plane magnetic field applied in the film. The effective electric-field control of SOT and the giant spin-torque efficiency in Cr-doped TI may lead to the development of energy-efficient gate-controlled spin-torque devices compatible with modern field-effect semiconductor technologies.
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http://dx.doi.org/10.1038/nnano.2015.294DOI Listing
April 2016

Magneto-optical investigation of spin-orbit torques in metallic and insulating magnetic heterostructures.

Nat Commun 2015 Dec 8;6:8958. Epub 2015 Dec 8.

Department of Electrical Engineering, Device Research Laboratory, University of California, Los Angeles, California 90095, USA.

Manipulating magnetism by electric current is of great interest for both fundamental and technological reasons. Much effort has been dedicated to spin-orbit torques (SOTs) in metallic structures, while quantitative investigation of analogous phenomena in magnetic insulators remains challenging due to their low electrical conductivity. Here we address this challenge by exploiting the interaction of light with magnetic order, to directly measure SOTs in both metallic and insulating structures. The equivalency of optical and transport measurements is established by investigating a heavy-metal/ferromagnetic-metal device (Ta/CoFeB/MgO). Subsequently, SOTs are measured optically in the contrasting case of a magnetic-insulator/heavy-metal (YIG/Pt) heterostructure, where analogous transport measurements are not viable. We observe a large anti-damping torque in the YIG/Pt system, revealing its promise for spintronic device applications. Moreover, our results demonstrate that SOT physics is directly accessible by optical means in a range of materials, where transport measurements may not be possible.
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http://dx.doi.org/10.1038/ncomms9958DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4686864PMC
December 2015

The Association Between Primary Open Angle Glaucoma and Clustered Components of Metabolic Syndrome.

Open Ophthalmol J 2015 6;9:149-55. Epub 2015 Oct 6.

Department of Ophthalmology, Jundishapur University of Medical Sciences, Ahvaz, Iran.

Purpose: There is conflicting evidence whether components of metabolic syndrome (MetS) increase or decrease the risk of primary open-angle glaucoma (POAG). The aim of the present study was to determine the association between metabolic syndrome and primary open-angle glaucoma.

Methods: A total of 200 participants comprising 100 controls and 100 patients with POAG documented by clinical tests and examined by an experienced ophthalmologist using standard ophthalmologic equipment were included in the study. MetS was defined and based on ATP III criteria and POAG was defined by the criteria of the International Society of Geographic and Epidemiological Ophthalmology (ISGEO). The data were entered into the SPSS software and analyzed.

Results: The prevalence of MetS in the glaucoma group was 53% in comparison to 38% in the control group (p=0.037). MetS was associated with an increased odds ratio for an IOP higher than 21 mmHg (OR: 1.72; 95% CI 1.03-2.79; p=0.034). The mean IOP was 24.91±4.29 mmHg in the patients without MetS, and 27.23±4.81 mmHg in those with MetS (p=0.027). The mean values of CCT were 603.64±63.16 µm in MetS patients and 579.27±72.87 µm in controls (p=0.018).

Conclusion: Data showed an increased prevalence of components of metabolic syndrome in patients with glaucoma. The mechanisms underlying these associations need to be established in future studies. Our results support the recommendation that patients with metabolic syndrome undergo regular ophthalmological exams to monitor for the onset or progression of glaucoma.
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http://dx.doi.org/10.2174/1874364101509010149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4627385PMC
November 2015

High-Current Gain Two-Dimensional MoS₂-Base Hot-Electron Transistors.

Nano Lett 2015 Dec 6;15(12):7905-12. Epub 2015 Nov 6.

Department of Electrical Engineering, University of California at Los Angeles , Los Angeles, California 90095, United States.

The vertical transport of nonequilibrium charge carriers through semiconductor heterostructures has led to milestones in electronics with the development of the hot-electron transistor. Recently, significant advances have been made with atomically sharp heterostructures implementing various two-dimensional materials. Although graphene-base hot-electron transistors show great promise for electronic switching at high frequencies, they are limited by their low current gain. Here we show that, by choosing MoS2 and HfO2 for the filter barrier interface and using a noncrystalline semiconductor such as ITO for the collector, we can achieve an unprecedentedly high-current gain (α ∼ 0.95) in our hot-electron transistors operating at room temperature. Furthermore, the current gain can be tuned over 2 orders of magnitude with the collector-base voltage albeit this feature currently presents a drawback in the transistor performance metrics such as poor output resistance and poor intrinsic voltage gain. We anticipate our transistors will pave the way toward the realization of novel flexible 2D material-based high-density, low-energy, and high-frequency hot-carrier electronic applications.
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http://dx.doi.org/10.1021/acs.nanolett.5b03768DOI Listing
December 2015

Pneumatic Rupture of Rectosigmoid; a Case Report.

Emerg (Tehran) 2014 ;2(4):180-2

Young Researchers Club, Islamic Azad University, Babol Branch, Babol, Iran.

Pneumatic rectosigmoid rapture is usually occurred following the inappropriate fun by direct entering a high volume of the air through the pneumatic device to the anus. Such an event was reported for the first time in 1904 by Stone. Diagnosis and treatment of such injuries are often delayed because of some social limitations and preventing the patient form explaining the event. Colon sigmoid rupture and pneumoperitoneum is one of the most dangerous and life treating complications of entering a high volume of the air to the rectum in a short time. There are only a few reports regarding the similar cases. Here, a case of pneumatic rectosigmoid rapture was reported in a 53 year-old male following an inappropriate fun.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4614569PMC
October 2015

Clinical Presentation and Microbial Analyses of Contact Lens Keratitis; an Epidemiologic Study.

Emerg (Tehran) 2014 ;2(4):174-7

School of Nursing and Midwifery, Babol University of Medical Sciences, Babol, Iran.

Introduction: Microbial keratitis is an infective process of the cornea with a potentially and serious visual impairments. Contact lenses are a major cause of microbial keratitis in the developed countries especially among young people. Therefore, the purpose of the present study was to evaluate the frequency and microbiological characteristic of CLK in patients referred to the emergency department (ED) of teaching hospitals, Babol, Iran.

Methods: This is a cross-sectional study of all patients with contact lens induced corneal ulcers admitted to the teaching hospitals of Babol, Iran, from 2011- 2013. An ophthalmologist examined patients with the slit-lamp and clinical features of them were noted (including pain, redness, foreign body sensation, chemosis, epiphora, blurred vision, discomfort, photophobia, discharge, ocular redness and swelling). All suspected infectious corneal ulcers were scraped for microbial culture and two slides were prepared. Data were analyzed using SPSS software, version 18.0.

Results: A total of 14 patients (17 eyes) were recruited into the study (100% female). The patients' age ranged from 16-37 years old (mean age 21.58±7.23 years). The most prevalent observed clinical signs were pain and redness. Three samples reported as sterile. The most common isolated causative organism was pseudomonas aeroginosa (78.6%), Staphylococcus aureus 14.3%, and enterobacter 7.1%, respectively. Treatment outcome was excellent in 23.5%, good in 47.1%, and poor in 29.4% of cases.

Conclusion: Improper lens wear and care as well as the lack of awareness about the importance of aftercare visits have been identified as potential risk factors for the corneal ulcer among contact lens wearers. Training and increasing the awareness of adequate lens care and disinfection practices, consulting with an ophthalmologist, and frequent replacement of contact lens storage cases would greatly help reducing the risk of microbial keratitis.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4614568PMC
October 2015

Metabolic syndrome and its components associated with chronic kidney disease.

J Res Med Sci 2015 May;20(5):465-9

Department of Internal Medicine, Mazandaran University of Medical Sciences, Sari, Iran.

Background: There is limited information on the relationship between metabolic syndrome (MetS) and chronic kidney disease (CKD) in the Iranian population, a group that has a high prevalence of CKD and obesity. The aim of present study was to determine the relationship between MetS and CKD in West of Iran.

Materials And Methods: A total of 800 subjects aged more than 35 years admitted from 2011 to 2013 were enrolled in the study. MetS was defined based on the Adult Treatment Panel III criteria, and CKD was defined from the Kidney Disease Outcomes Quality Initiative practice guidelines. Waist circumference and body mass index were calculated, as well, blood samples were taken and lipid profile, plasma glucose levels, and serum creatinine were measured. Data were analyzed with SPSS version 17 (SPSS Inc., Chicago, IL, USA).

Results: CKD was seen in 14.8% patients with MetS and 8.3% individuals without MetS. MetS was associated with an increased odds ratio (OR) for a glomerular filtration rate <60 ml/min/1.73 m(2) (OR: 1.91; 95% confidence interval [CI]: 1.22-2.99; P = 0.004). Individuals with 2, 3, 4, and 5 components of the MetS had an increased OR for CKD: 2.19 (95% CI: 0.95-3.62), 2.65 (95% CI: 1.03-4.71), 2.86 (95% CI: 1.08-5.53), and 5.03 (95% CI: 1.80-8.57), respectively, compared with individuals with none of the components.

Conclusion: We found a high prevalence of CKD in patients with MetS compared with the subject without MetS. Our observations raised major clinical and public health concerns in Iran, where both the MetS and kidney diseases are becoming common.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4590201PMC
http://dx.doi.org/10.4103/1735-1995.163969DOI Listing
May 2015

An Additive Effect of Oral N-Acetyl Cysteine on Eradication of Helicobacter pylori.

J Pathog 2015 2;2015:540271. Epub 2015 Sep 2.

Young Researchers Club, Islamic Azad University, Babol Branch, Babol, Iran.

Background. Helicobacter pylori is highly adapted to the gastric environment where it lives within or beneath the gastric mucous layer. The aim of this study was to evaluate whether the addition of N-acetyl cysteine to the treatment regimen of H. pylori infection would affect eradication rates of the disease. Methods. A total of 79 H. pylori positive patients were randomized to two therapeutic groups. Both groups received a 14-day course of three-drug regimen including amoxicillin/clarithromycin/omeprazole. Experimental group (38 subjects) received NAC, and control group (41 subjects) received placebo, besides three-drug regimen. H. pylori eradication was evaluated by urea breath test at least 4 weeks after the cessation of therapy. Results. The rate of H. pylori eradication was 72.9% and 60.9% in experimental and control groups, respectively (P = 0.005). By logistic regression modeling, female gender (OR 3.68, 95% CI: 1.06-5.79; P = 0.040) and treatment including NAC (OR 1.88, 95% CI: 0.68-3.15; P = 0.021) were independent factors associated with H. pylori eradication. Conclusion. The results of the present study show that NAC has an additive effect on the eradication rates of H. pylori obtained with three-drug regimen and appears to be a promising means of eradicating H. pylori infection.
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http://dx.doi.org/10.1155/2015/540271DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4572430PMC
September 2015

The rabies early death phenomenon: A report of ineffective administration of rabies vaccine during symptomatic disease.

Indian J Crit Care Med 2015 Jul;19(7):422-4

Young Researchers Club, Islamic Azad University, Babol, Iran.

It was reported that in some individuals who received postexposure rabies vaccine, clinical features of rabies developed at the shorter time compared to individuals who were exposed, but not received the vaccine, which called "early death" phenomenon. We reported an early death phenomenon in a 67-year-old woman who was bitten by a jackal, although receiving three dose of rabies vaccine. Results show that the immune response to rabies has a dual role, sometimes has a favorable effect on survival but sometimes amplification the disease.
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http://dx.doi.org/10.4103/0972-5229.160292DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4502497PMC
July 2015

Metabolic syndrome and inflammatory biomarkers in adults: a population-based survey in Western region of iran.

Int Cardiovasc Res J 2014 Dec 1;8(4):156-60. Epub 2014 Dec 1.

Imam Khomeini Hospital, Lorestan University of Medical Sciences, Khorramabad, IR Iran.

Background: There is evidence that inflammation may be involved in pathogenesis of MetS. Inflammatory biomarkers are moving to the forefront as the potent predictors of MetS.

Objectives: The present study aimed to evaluate the association between MetS and some inflammatory biomarkers.

Patients And Methods: This community-based cross-sectional study was conducted on 800 subjects aged above 35 years selected through random sampling in Borujerd (west of Iran) from 2011 to 2013. MetS was defined based on ATP III criteria and the subjects were divided into two groups (MetS and non-MetS groups). Waist circumference and Body Mass Index (BMI) were calculated. In addition, blood samples were taken and C-Reactive Protein (CRP), lipid profile, Fasting Blood Sugar (FBS), and Bleeding Time (BT) were measured. Then, the correlations between MetS and the above-mentioned variables were estimated. After all, the data were entered into the SPSS statistical software (v. 17) and analyzed using T-test, chi-square, median test, and spearman's rank correlation.

Results: In this study, 344 subjects (43%) met the ATP III criteria. The results showed a significant difference between MetS and non-MetS groups regarding BMI, white blood cell, total cholesterol, LDL, platelet, and high-sensitivity CPR (hs-CRP) (P < 0.0001, P = 0.040, P < 0.0001, P < 0.0001, and P = 0.045, respectively). Besides, waist circumference, Triglyceride (TG), FBS, and systolic and diastolic blood pressure were significantly higher, while HDL was significantly lower in the MetS group (P < 0.0001).

Conclusions: The incidence rate of MetS in our survey was higher compared to the previous reports. In addition, this incidence rate was higher in females in comparison to males. The results also showed a significant correlation between inflammatory biomarkers and MetS and that the higher levels of hs-CRP were associated with higher rate of MetS.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4302503PMC
December 2014

Large Left Atrial Myxoma Causing Mitral Valve Obstruction: A Rare Cause of Syncope.

J Cardiovasc Echogr 2014 Oct-Dec;24(4):125-127

Young Researchers Club, Islamic Azad University, Babol Branch, Babol, Iran.

Cardiac myxoma is the most frequent benign tumors of heart. A 37-year-old woman dropped during the second prostration in prayer and decreased his mental state, with no prior history of syncope. On cardiac examination, there was an early diastolic sound that was compatible with a tumor plop. A transthoracic echocardiogram was performed which showed the presence of a pediculated mass in the left atrium, with an appearance suggestive of atrial myxoma. Atrial Myxoma can appear with non-specific symptoms. The best diagnostic method for myxoma is echocardiography that has a high sensitivity.
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http://dx.doi.org/10.4103/2211-4122.147208DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5353565PMC
May 2017

Electrical detection of spin-polarized surface states conduction in (Bi(0.53)Sb(0.47))2Te3 topological insulator.

Nano Lett 2014 Sep 28;14(9):5423-9. Epub 2014 Aug 28.

Device Research Laboratory, Department of Electrical Engineering, University of California , Los Angeles, California 90095, United States.

Strong spin-orbit interaction and time-reversal symmetry in topological insulators enable the spin-momentum locking for the helical surface states. To date, however, there has been little report of direct electrical spin injection/detection in topological insulator. In this Letter, we report the electrical detection of spin-polarized surface states conduction using a Co/Al2O3 ferromagnetic tunneling contact in which the compound topological insulator (Bi0.53Sb0.47)2Te3 was used to achieve low bulk carrier density. Resistance (voltage) hysteresis with the amplitude up to about 10 Ω was observed when sweeping the magnetic field to change the relative orientation between the Co electrode magnetization and the spin polarization of surface states. The two resistance states were reversible by changing the electric current direction, affirming the spin-momentum locking in the topological surface states. Angle-dependent measurement was also performed to further confirm that the abrupt change in the voltage (resistance) was associated with the magnetization switching of the Co electrode. The spin voltage amplitude was quantitatively analyzed to yield an effective spin polarization of 1.02% for the surface states conduction in (Bi0.53Sb0.47)2Te3. Our results show a direct evidence of spin polarization in the topological surface states conduction. It might open up great opportunities to explore energy-efficient spintronic devices based on topological insulators.
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http://dx.doi.org/10.1021/nl5026198DOI Listing
September 2014

Effects of Vitamin D and Calcium Supplementation on Micro-architectural and Densitometric Changes of Rat Femur in a Microgravity Simulator Model.

Iran Red Crescent Med J 2014 Jun 5;16(6):e18026. Epub 2014 Jun 5.

Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences , Tehran, IR Iran.

Background: Revealing data on the role of vitamin D and calcium supplementation in bone health has led some to suggest that vitamin D and calcium treatment could also play a role in protecting bone against microgravity-induced mineral loss.

Objectives: The aim of the present study was to investigate the effects of vitamin D and calcium administration on microscopic and densitometric changes of rat femur in a Microgravity Simulator Model.

Materials And Methods: After designing a Microgravity Simulator Model, 14 rats were placed in the cages as follows: seven rats as osteoporosis group and seven rats received oral supplement of calcium/vitamin D as the treatment group. Animals were sacrificed after eight weeks and then both femurs were removed. Bone mineral density was measured for one femur from each animal, and morphologic studies were evaluated for the contralateral femur.

Results: Bone mineral density of the whole femur in the treatment group was significantly higher than the osteoporosis group (0.168 ± 0.005 vs. 0.153 ± 0.006, P = 0.003). Also, bone mineral content of the whole femur was significantly higher in treatment group (0.415 ± 0.016 vs. 0.372 ± 0.019, P = 0.003). However, resorption eroded surface percentage was higher in the osteoporosis group (18.86 ± 3.71% vs. 9.71 ± 1.61%, P = 0.002).

Conclusions: According to the results of this study, vitamin D and calcium administration might have protective effects against microgravity-induced mineral loss in a Rat Microgravity Simulator Model.
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http://dx.doi.org/10.5812/ircmj.18026DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4102987PMC
June 2014

Proximity induced high-temperature magnetic order in topological insulator--ferrimagnetic insulator heterostructure.

Nano Lett 2014 Jun 23;14(6):3459-65. Epub 2014 May 23.

Department of Electrical Engineering, University of California , Los Angeles, California 90095, United States.

Introducing magnetic order in a topological insulator (TI) breaks time-reversal symmetry of the surface states and can thus yield a variety of interesting physics and promises for novel spintronic devices. To date, however, magnetic effects in TIs have been demonstrated only at temperatures far below those needed for practical applications. In this work, we study the magnetic properties of Bi2Se3 surface states (SS) in the proximity of a high Tc ferrimagnetic insulator (FMI), yttrium iron garnet (YIG or Y3Fe5O12). Proximity-induced butterfly and square-shaped magnetoresistance loops are observed by magneto-transport measurements with out-of-plane and in-plane fields, respectively, and can be correlated with the magnetization of the YIG substrate. More importantly, a magnetic signal from the Bi2Se3 up to 130 K is clearly observed by magneto-optical Kerr effect measurements. Our results demonstrate the proximity-induced TI magnetism at higher temperatures, an important step toward room-temperature application of TI-based spintronic devices.
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http://dx.doi.org/10.1021/nl500973kDOI Listing
June 2014

Magnetization switching through giant spin-orbit torque in a magnetically doped topological insulator heterostructure.

Nat Mater 2014 Jul 28;13(7):699-704. Epub 2014 Apr 28.

Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.

Recent demonstrations of magnetization switching induced by in-plane current in heavy metal/ferromagnetic heterostructures (HMFHs) have drawn great attention to spin torques arising from large spin-orbit coupling (SOC). Given the intrinsic strong SOC, topological insulators (TIs) are expected to be promising candidates for exploring spin-orbit torque (SOT)-related physics. Here we demonstrate experimentally the magnetization switching through giant SOT induced by an in-plane current in a chromium-doped TI bilayer heterostructure. The critical current density required for switching is below 8.9 × 10(4) A cm(-2) at 1.9 K. Moreover, the SOT is calibrated by measuring the effective spin-orbit field using second-harmonic methods. The effective field to current ratio and the spin-Hall angle tangent are almost three orders of magnitude larger than those reported for HMFHs. The giant SOT and efficient current-induced magnetization switching exhibited by the bilayer heterostructure may lead to innovative spintronics applications such as ultralow power dissipation memory and logic devices.
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http://dx.doi.org/10.1038/nmat3973DOI Listing
July 2014

The influence of social networking technologies on female religious veil-wearing behavior in Iran.

Cyberpsychol Behav Soc Netw 2014 May 10;17(5):317-21. Epub 2014 Mar 10.

1 Department of Family Medicine, David Geffen School of Medicine, University of California , Los Angeles, California.

Abstract Social networking technologies can influence attitudes, behaviors, and social norms. Research on this topic has been conducted primarily among early adopters of technology and within the United States. However, it is important to evaluate how social media might affect people's behaviors in international settings, especially among countries with longstanding, government recommended, cultural and religious traditions and behaviors, such as Iran. This study seeks to assess whether Iranian women who have been using social networking technologies for a longer time (compared to those who have recently joined) would be less likely to cover themselves with a veil and be more comfortable publicly displaying pictures of this behavior on Facebook. Iranian females (N=253) were selected through snowball sampling from nongovernmental organizations in November 2011 and asked to complete a survey assessing their use of Facebook, concerns about not wearing a veil in Facebook pictures, and their actual likelihood of wearing a veil. Items were combined to measure lack of interest in wearing a veil. Length of time as a Facebook user was significantly associated with not wearing a veil (b=0.16, p<0.01), controlling for age, education, and frequency of using Facebook. Results also revealed a significant relationship such that older people were more likely to adhere to the religious behavior of wearing a veil (b=-0.45, p<0.01). Social networking technologies can affect attitudes and behaviors internationally. We discuss methods of using social media for self-presentation and expression, as well as the difficulties (and importance) of studying use of technologies, such as social media, internationally.
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http://dx.doi.org/10.1089/cyber.2013.0338DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4012633PMC
May 2014

Transient Rayleigh scattering: a new probe of picosecond carrier dynamics in a single semiconductor nanowire.

Nano Lett 2012 Oct 19;12(10):5389-95. Epub 2012 Sep 19.

Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA.

Using a new technique, transient Rayleigh scattering, we show that measurements from a single GaAs/AlGaAs core-shell semiconductor nanowire provide sensitive and detailed information on the time evolution of the density and temperature of the electrons and holes after photoexcitation by an intense laser pulse. Through band filling, band gap renormalization, and plasma screening, the presence of a dense and hot electron-hole plasma directly influences the real and imaginary parts of the complex index of refraction that in turn affects the spectral dependence of the Rayleigh scattering cross-section in well-defined ways. By measuring this spectral dependence as a function of time, we directly determine the thermodynamically independent density and temperature of the electrons and holes as a function of time after pulsed excitation as the carriers thermalize to the lattice temperature. We successfully model the results by including ambipolar transport, recombination, and cooling through optic and acoustic phonon emission that quantify the hole mobility at ∼68,000 cm(2)/V·s, linear decay constant at 380 ps, bimolecular recombination rate at 4.8 × 10(-9) cm(3)/s and the energy-loss rate of plasma due to optical and acoustic phonon emission.
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http://dx.doi.org/10.1021/nl302767uDOI Listing
October 2012

Photomodulated rayleigh scattering of single semiconductor nanowires: probing electronic band structure.

Nano Lett 2011 Oct 16;11(10):4329-36. Epub 2011 Sep 16.

Department of Physics, University of Cincinnati , Cincinnati, Ohio 45221-0011, United States.

The internal electronic structures of single semiconductor nanowires can be resolved using photomodulated Rayleigh scattering spectroscopy. The Rayleigh scattering from semiconductor nanowires is strongly polarization sensitive which allows a nearly background-free method for detecting only the light that is scattered from a single nanowire. While the Rayleigh scattering efficiency from a semiconductor nanowire depends on the dielectric contrast, it is relatively featureless as a function of energy. However, if the nanowire is photomodulated using a second pump laser beam, the internal electronic structure can be resolved with extremely high signal-to-noise and spectral resolution. The photomodulated Rayleigh scattering spectra can be understood theoretically as a first derivative of the scattering efficiency that results from a modulation of the band gap and depends sensitively on the nanowire diameter. Fits to spectral lineshapes provide both the band structure and the diameter of individual GaAs and InP nanowires under investigation.
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http://dx.doi.org/10.1021/nl202433gDOI Listing
October 2011

Direct measure of strain and electronic structure in GaAs/GaP core-shell nanowires.

Nano Lett 2010 Mar;10(3):880-6

Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA.

Highly strained GaAs/GaP nanowires of excellent optical quality were grown with 50 nm diameter GaAs cores and 25 nm GaP shells. Photoluminescence from these nanowires is observed at energies dramatically shifted from the unstrained GaAs free exciton emission energy by 260 meV. Using Raman scattering, we show that it is possible to separately measure the degree of compressive and shear strain of the GaAs core and show that the Raman response of the GaP shell is consistent with tensile strain. The Raman and photoluminescence measurement are both on good agreement with 8 band k.p calculations. This result opens up new possibilities for engineering the electronic properties of the nanowires for optimal design of one-dimensional nanodevices by controlling the strain of the core and shell by varying the nanowire geometry.
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http://dx.doi.org/10.1021/nl903547rDOI Listing
March 2010

Carrier dynamics and quantum confinement in type II ZB-WZ InP nanowire homostructures.

Nano Lett 2009 Feb;9(2):648-54

Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221-0011, USA.

We use time-resolved photoluminescence from single InP nanowires containing both wurtzite (WZ) and zincblende (ZB) crystalline phases to measure the carrier dynamics of quantum confined excitons in a type-II homostructure. The observed recombination lifetime increases by nearly 2 orders of magnitude from 170 ps for excitons above the conduction and valence band barriers to more than 8400 ps for electrons and holes that are strongly confined in quantum wells defined by monolayer-scale ZB sections in a predominantly WZ nanowire. A simple computational model, guided by detailed high-resolution transmission electron microscopy measurements from a single nanowire, demonstrates that the dynamics are consistent with the calculated distribution of confined states for the electrons and holes.
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http://dx.doi.org/10.1021/nl802997pDOI Listing
February 2009