New formulation of vitamin C encapsulation by nanoliposomes: production and evaluation of particle size, stability and control release

Samaneh Amiri,Mahmoud Rezazadeh-Bari,Mohammad Alizadeh-Khaledabad,Saber Amiri 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2

In the present study, the effects of differentratios of milk phospholipids, cholesterol and phytosterols(Campesterol) powder (50–100%, 0–50%, and 0–50%,respectively) and sonication time (20, 25, 30, 35 and40 min) were investigated to produce a new formulation ofnanoliposomes for encapsulation of vitamin C. The resultsshowed that increasing the time of sonication anddecreasing the ratio of phospholipid to phytosterol significantlydecreased nanoliposomes’ particle size (p\0.05). The maximum encapsulation efficiency was obtained at 35and 40 min of sonication time and 75–25 ratio of phospholipid:phytosterol. Also, reducing the sonication time inthe same ratio of phospholipid/phytosterol caused toincrease the controlled release. The highest stability ofvitamin C during 20 days was obtained in the ratio of75–25 (phospholipids: campesterol). The results showed apositive effect of cholesterol replacement with campesterolon encapsulation efficiency, control release and stability ofvitamin C in nanoliposomes.

Effects of load variation on a Kaplan turbine runner

Amiri, K.,Mulu, B.,Cervantes, M.J.,Raisee, M. Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.2

Introduction of intermittent electricity production systems like wind and solar power to electricity market together with the deregulation of electricity markets resulted in numerous start/stops, load variations and off-design operation of water turbines. Hydraulic turbines suffer from the varying loads exerted on their stationary and rotating parts during load variations since they are not designed for such operating conditions. Investigations on part load operation of single regulated turbines, i.e., Francis and propeller, proved the formation of a rotating vortex rope (RVR) in the draft tube. The RVR induces pressure pulsations in the axial and rotating directions called plunging and rotating modes, respectively. This results in oscillating forces with two different frequencies on the runner blades, bearings and other rotating parts of the turbine. This study investigates the effect of transient operations on the pressure fluctuations exerted on the runner and mechanism of the RVR formation/mitigation. Draft tube and runner blades of the Porjus U9 model, a Kaplan turbine, were equipped with pressure sensors for this purpose. The model was run in off-cam mode during different load variations. The results showed that the transients between the best efficiency point and the high load occurs in a smooth way. However, during transitions to the part load a RVR forms in the draft tube which induces high level of fluctuations with two frequencies on the runner; plunging and rotating mode. Formation of the RVR during the load rejections coincides with sudden pressure change on the runner while its mitigation occurs in a smooth way.

Gut compartments and ovary bacterial symbionts of the Sunn pest

Amiri Azam,Bandani Ali R.,Kafil Maryam 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.3

The Sunn pest, Eurygaster integriceps (Hemiptera: Scutelleridae), is the severe pest of cereals, especially of wheat in many parts of the world. Many insect species, including the Sunn pest that feed solely on nutritionally restricted diets, harbor symbiotic microorganisms. In the current study, we isolated and identified the Sunn pest bacterial symbionts of gut fractions and ovary. The phylogenetic analysis indicated that Sunn pest gut bacterial symbionts are polyphyletic and contained a taxonomic diversity belonging to three different phyla, including Firmicutes, Tenericutes, and Proteobacteria. Firmicutes was represented by Enterococcus, Proteobacteria by Pantoea and Acetobacteraceae, and Tenericutes by Spiroplasma. We isolated and identified Enterococcus, Acetobacteraceae, Spiroplasma and Pantoea from Sunn pest different gut compartments, and Pantoea from ovaries. There was considerable overlap between recognized symbionts from the 2nd and 3rd midgut sections (Acetobacteraceae), the 4th midgut section and hindgut (Spiroplasma), and 4th midgut section and ovary (Pantoea). Niche heterogeneity within a microbial habitat of gut fractions resulted in colonizing and adaptation of various communities of symbionts in each fraction. The Sunn pest gut compartments and ovary symbionts have been demonstrated to be of multiple evolutionary origins. This diversity may be of great importance to the Sunn pest fitness and survival in various overwintering niches.

Simulation of earthquake records using combination of wavelet analysis and non-stationary Kanai-Tajimi model

Amiri, G. Ghodrati,Bagheri, A. Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2

This paper is aimed at combining wavelet multiresolution analysis and nonstationary Kanai-Tajimi model for the simulation of earthquake accelerograms. The proposed approach decomposes earthquake accelerograms using wavelet multiresolution analysis for the simulation of earthquake accelerograms. This study is on the basis of some Iranian earthquake records, namely Naghan 1977, Tabas 1978, Manjil 1990 and Bam 2003. The obtained results indicate that the simulated records preserve the significant properties of the actual accelerograms. In order to investigate the efficiency of the model, the spectral response curves obtained from the simulated accelerograms have been compared with those from the actual records. The results revealed that there is a good agreement between the response spectra of simulated and actual records.

The Impact of Feudalism and Racialism on The Construction of Self- and Gender Identities in Mohamed S. Mohamed’s Kiu and Nyota ya Rehema

Amiri Swaleh 한국외국어대학교 아프리카연구소 2020 Asian Journal of African Studies Vol.- No.47

This paper analyses and evaluates the impact of feudalism and racialism on the mapping and construction of self- and gender identities in Mohamed S. Mohamed’s two novels: Kiu (1972) and Nyota ya Rehema (1976). The study will use a composite approach comprising New Historicism, Gender Criticism and Stylistics. New Historicism helped to situate and map the works analyzed in relation to particular Zanzibari epochs. Gender Criticism was expended in interrogating how women and men in feudal Zanzibari society related with each other at all levels of social interaction and the impact on their self- and gender identities. Finally, stylistics was used to interrogate and evaluate the dominant structural and stylistic features of the choice texts and their impact on the study topic.The study will be guided by two hypotheses, viz, that in feudal Zanzibari society, racialism and the dominant ideologies (patriarchy, feudalism and racialism), impacted negatively on the self- and gender identities of both female and male members of Zanzibari society. Secondly, this study contends that, the stylistic devices used in each one of the choice texts, were important in delineating the mapping and construction of self- and gender identities..

Relationship Between Assertion and Aggression with Addiction Potential: A Cross-Sectional Study in 2019

Amiri Mohammad,Sadeghi Zakieh,Sadeghi Elham,Khosravi Ahmad 질병관리본부 2020 Osong Public Health and Research Persptectives Vol.11 No.4

Objectives This study aimed to determine the relationship between assertion and aggression with addiction potential among students in Shahroud University of Medical Sciences. Methods In this cross-sectional study conducted in 2019, 500 students of Shahroud University of Medical Sciences, were selected by multistage random sampling, for a study using the Addiction Potential Scale, and Assertion and Aggression Questionnaires. Data were analyzed using ANOVA, Chi-square, t test, Pearson’s correlation coefficient, and the linear regression model. Results The mean scores of addiction potential, aggression, and assertion were 32.7 ± 17.2, 41.5 ± 12.9 and 139.4 ± 22.3, respectively. In this study, 38.8% (N = 194) of students had high aggression and 76.8% (N = 384) had high assertion. In the regression model, aggression, history of drug and addictive substances abuse, history of tobacco use, and history of alcohol abuse were significantly related to addiction potential (p ≤ 0.05). There was a negative relationship between assertion and addiction potential so that with one-unit increase in the assertion score, the addiction potential score decreased by −0.11. Conclusion Given the direct relationship between aggression and addiction potential, and since more than three-quarters of the students had moderate to high aggression, it is necessary to pay more attention to this issue. Interventions may play an important role in improving the current situation.

Understanding the Dynamics between U.S. City Diplomacy and Public Diplomacy

Amiri, Sohaela The Korean Association for Public Diplomacy 2022 Journal of public diplomacy Vol.2 No.1

What is the relationship between city diplomacy and public diplomacy in the United States? Whilst this question is often raised among scholars and practitioners of public diplomacy, a concrete and systematic response to it seems difficult to locate. This paper addresses the question by relying on earlier research based on empirical analysis of data from semi-structured interviews with city officials with international purview in the United States as well as with current and former officials at the U.S. Department of State who have worked on topics related to city diplomacy. The research and analysis that informs this paper and the diagrams it offers are hinged on design principles and adopt an architecture studio style approach to data analysis. Further, multidimensional scaling and correspondence analysis are used to visualize the convergence and divergence between the functions of public diplomacy, as introduced by Nicholas Cull, and the functions of city diplomacy that this paper introduces. This is done to first, provide a framework for understanding the dynamics between city diplomacy and public diplomacy; and second, uncover the policy intervention space that could guide policies for making U.S. city diplomacy and public diplomacy more strategically aligned.

DISTANCE BETWEEN CONTINUOUS FRAMES IN HILBERT SPACE

Amiri, Zahra,Kamyabi-Gol, Rajab Ali Korean Mathematical Society 2017 대한수학회지 Vol.54 No.1

In this paper, we study some equivalence relations between continuous frames in a Hilbert space ${\mathcal{H}}$. In particular, we seek two necessary and sufficient conditions under which two continuous frames are near. Moreover, we investigate a distance between continuous frames in order to acquire the closest and nearest tight continuous frame to a given continuous frame. Finally, we implement these results for shearlet and wavelet frames in two examples.

Effects of Sequential Trinexapac-Ethyl Applications and Traffic on Growth of Perennial Ryegrass (Lolium perenne L.)

Amiri-Khah, Rahim,Eetemadi, Nematollah,Nikbakht, Ali,Pessarakli, Mohammad Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.3

Mowing turfgrasses, especially fast growing species like perennial ryegrass, is one of the most time and money consuming tasks of their management. Trinexapac-ethyl (TE) is a popular plant growth regulator used to reduce mowing requirements, improve stress tolerance, and enhance turf quality. This study was conducted to investigate the effect of TE rate and frequency of applications on growth response and traffic tolerance of perennial ryegrass. The experiment was a split-plot laid out in a randomized complete block (RCB) design with three replications. TE was applied to main plots at 0.00, 0.25, and $0.50kg\;a.i.\;ha^{-1}$. Application pattern included an initial application, followed by two sequential applications at 6-wk intervals. Traffic treatment was applied to subplots with a cleated roller. Results demonstrated that TE consistently reduced vertical shoot growth, clippings dry weight, with maximum growth reduction of 59% and 65%, for 0.25 and $0.50kg\;a.i.\;ha^{-1}$, respectively, occurring at 2 weeks after initial TE treatment (WAT). Traffic also dramatically reduced vertical shoot growth and clippings dry weight. Overall, quality of perennial ryegrass was enhanced by sequential TE applications, however, turf quality and surface coverage reduced greatly under traffic, regardless of TE treatment. Total chlorophyll, chlorophyll a and chlorophyll b and total carbohydrates (TC) contents were also positively influenced following sequential TE application. Our results indicated that TE reduces mowing frequency and enhances turf quality rather than influencing traffic resistance.

Preparation, Characterization and Cytotoxicity of Silibinin-Containing Nanoniosomes in T47D Human Breast Carcinoma Cells

Amiri, Boshra,Ebrahimi-Far, Meysam,Saffari, Zahra,Akbarzadeh, Azim,Soleimani, Esmaeil,Chiani, Mohsen Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Background: Breast cancer is one of the most frequent cancer types within female populations. Silibinin is a chemotherapeutic agent ative against cancer. Niosomes are biodegradable, biocompatible, safe and effective carriers for drug delivery. Objective:To prepare nanoniosomal silibinin and evaluate its cytotoxicity inthe T-47D breast cancer cell line. Materials and Methods: Niosomes were prepared by reverse phase evaporation of a mixture of span 20, silibinin, PEG-2000 and cholesterol in chloroform and methanol solvent (1:2 v/v). The solvent phase was evaporated using a rotary evaporator and the remaining gel phase was hydrated in phosphate buffer saline. Mean size, size distribution and zeta potential of niosomes were measured with a Zetasizer instrument and then nanoparticles underwent scanning electron microscopy. The drug releasing pattern was evaluated by dialysis and the cytotoxicity of nanoniosomes in T-47D cells was assessed by MTT assay. Results: Particle size, size variation and zeta potential of the niosomal nanoparticles were measured as $178.4{\pm}5.4nm$, $0.38{\pm}0.09$ and $-15.3{\pm}1.3mV$, respectively. The amount of encapsulated drug and the level of drug loading were determined $98.6{\pm}2.7%$ and $22.3{\pm}1.8%$, respectively; released drug was estimated about $18.6{\pm}2.5%$ after 37 hours. The cytotoxic effects of nanoniosome were significantly increased when compared with the free drug. Conclusions: This study finding suggests that silibinin nanoniosomes could serve as a new drug formulation for breast cancer therapy.