در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Nusselt number,Reynolds Number,friction factor,nano-fluid,Twisted tape
- چکیده:
- چکیده انگلیسی: Power plants are of great influential industries to the environment which could be studied in many ways. Since the optimum equipment would consume less fuel, the issue is mainly interested to those who are concerned about the environmental effects. Amongst various methods, utilizing twisted tapes inserts which are of passive type is interested in this effort. Although numerous types of tapes are widely utilized, modifying the tape configuration according to the flow specification is still interested. So here the center-cleared and perforated tapes are considered to be compared against the typical type. The 3D numerical simulation of finite volume method was applied to cover the flow field of the problem. The RNG k-ε turbulence model was responsible for the turbulent behavior of the flow and its circular trend. In order to develop the performance of the optimum tape performance, AL2O3 nanoparticles of different volume concentrations were added to the base fluid. The results showed that the Nu number was enhanced about 22% by using merely the center-cleared 14cm, while the friction factor was increased about 13%. To develop these amounts for the optimum configuration, adding nanoparticles of 0.1% concentration put and increment of 26% for heat transfer.
- انتشار مقاله: 23-08-1395
- نویسندگان: Yousef Vazifeshenas,Reza Yousefi,Esmaeil Rahimi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Plant Molecular Breeding
- نوع مقاله: Journal Article
- کلمات کلیدی: Mutation,Sodium Chloride,Enzyme activity,Ion homeostasis
- چکیده:
- چکیده انگلیسی: In order to assess the responses of Hashemi rice genotype and its advanced mutant line under salinity stress of 100 mM Sodium chloride (NaCl) for three and six days the shoot samples were taken for biochemical analysis. This experiment was performed in split plot based on randomized complete block design with three replications. The main factor was factorial combination of saline treatment and sampling period, sub factor included genotypes. The result showed that the chlorophyll content decreased (16.3) under salt stress for the wild type, but higher amount (21.2) in the mutant was recorded. The mutant rice showed higher amount of K+ and lower of Na+ concentrations in shoots under salt stress condition. The results revealed, although the amount of H2O2 of both genotypes was significantly increased by exposure to NaCl, the effect was superior in the wild genotype (44.85). The antioxidant enzymes activity include catalase and peroxidase activity were grow up significantly in advanced mutant line. Also, the level of flavonoids and phenol content under salinity stress were enhanced dramatically in mutant line. In order to evaluate ion homeostasis under salinity stress condition the measurement of osmolytes such as proline, glycine betaine and trehalose indicated the mutant rice by rising the production (4.4, 0.81 and 87.55 respectively) of these metabolites in shoot showed the better tolerance to salinity stress. In conclusion, the observation indicated that mutation had a positive impact on ROS scavenging system and ion homeostasis mechanism and ultimately have led to salt tolerance in the mutant genotype.
- انتشار مقاله: 03-07-1398
- نویسندگان: Maryam Forough,Saeid Navabpour,Esmaeil Ebrahimie,Ali Akbar Ebadi,Davood Kiani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Plant Molecular Breeding
- نوع مقاله: Journal Article
- کلمات کلیدی: Tobacco,Soybean,sugar beet,GFP,transgenic hairy roots
- چکیده:
- چکیده انگلیسی: Agrobacterium-mediated gene transfer method is one of the used methods for genetic transformation in the plant regeneration program. Transformation efficiency can be optimized depending on the strain of bacteria, the genotype of plant and conditions of growth. In this study, the gfp gene was transferred into sugar beet, tobacco, and soybean by Agrobacterium rhizogenes strain AR15834. The effects of bacterial concentrations, antibiotic concentrations and the types of explants and genotypes on the gene transfer efficiency and transgenic hairy roots production were investigated. The explants were inoculated with the bacteria at the adjusted concentrations and two days after the transformation, the explants were transferred to a solid MS medium containing different concentrations of kanamycin antibiotic. According to the results and the examined factors, the optimal conditions to achieving of the maximum production of transgenic hairy roots included bacterial concentration with OD600 = 0.2, cotyledon explant, 50 mg/L kanamycin concentration and Djakel genotype for soybean; bacterial concentration with OD600 = 0.2, leaf with petiole explant and SBSI004 genotype for sugar beet, and bacterial concentration with OD600nm = 0.8 and 100 mg/L kanamycin concentration for tobacco.
- انتشار مقاله: 21-10-1397
- نویسندگان: Nahid Sadeghi Ghahderijani,Ali Niazi,Esmaeil Ebrahimie,Ali Moghadam,Mohammad Sadegh Taghizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Particle Science & Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Work Index,Specific rate of Breakage,Microwave treatment,Grindability,Siliceous manganese ore
- چکیده:
- چکیده انگلیسی: In this study, the effect of microwave radiation on grindability and grinding kinetics were investigated. Microwave treatment was performed using an oven with 1100 W power and 2.45 GHz frequency. In order to study the breakage mechanism the grindability from the standard Bond ball mill work index (BBMWI) test was used with the selection function and breakage function as grinding parameters for treated and untreated samples. Based on the results of grindability, the work index (Wi) of a standard Bond ball mill after 4 min of microwave radiation decreased from 12.46 kWh/t to 6.45 kWh/t. selection function results showed that the specific rate of breakage (Si) value for the size fraction -3350+2360 µm increased to 8.42% after microwave treatment. Cumulative breakage function results showed that microwave-treated products were coarser in comparison with untreated products. This phenomenon is more significant in coarse fractions, where the effect of microwave treatment is more obvious.
- انتشار مقاله: 06-04-1397
- نویسندگان: Monireh Heshami,Rahman Ahmadi,Esmaeil Rahimi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Particle Science & Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: viscosity,mesh,barite,excavating mud,specific weight
- چکیده:
- چکیده انگلیسی: Barite is an important additive material to increase the weight of excavation mud. It has been used extensively in the excavation mud industry. The barite particle sizes used in excavation mud is very important. There is a direct relationship between the amount on the sift of 200 and 325 mesh. By reducing particle sizes of the 200 and 325 mesh, the specific gravity of the barite power increased slightly. It could be concluded that increasing the size of the barite powder particle can reduce density, but this should be considered as a laboratorial error. Thus, granulation has a great influence on the viscosity of barite powder. According to previous studies dimensions below 325 mesh are very influential on viscosity. It can be said excavating companies consume more barite powder when the specific gravity of excavation mud is diminished because barite powder can enhance specific gravity but the viscosity goes up. There will be more problems in the excavation mud if viscosity increases.
- انتشار مقاله: 06-08-1396
- نویسندگان: Mohamad Alizade Pudeh,Esmaeil Rahimi,Mehran Gholinejad,Amirhossein Soeezi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Patient Safety & Quality Improvement
- نوع مقاله: Journal Article
- کلمات کلیدی: Hospital,Operation,Surgery cancellation
- چکیده:
- چکیده انگلیسی: Introduction: Operations cancellation at the last minute is one of the main reasons of inefficiency and waste of resources in Hospitals. This study aims to investigate the reasons and the frequency of operations cancellations in Khatam-al-Anbia Eye Hospital (Mashhad-Iran) in 2013.
Materials and Methods:In this descriptive and cross-sectional study, all canceled scheduled operations in 2013 in Khatam-al-Anbiya Eye Hospital were investigated and the data were recorded in a checklist. Study variables included: 1) the number of planned operations, 2) the number of canceled operations, 3) age, 4) gender and 5) the reason of operation cancellation. Data were analyzed using descriptive statistics and SPSS16.
Results: Of 16512 operations scheduled during 2013, 329 cases (1.99 percent) were canceled. The reason of cancellation was not mentioned in (28.6 percent) of cases. Other reasons of operations cancellation included, in the order of importance, high-risk underlying disease (22.5%), medical advice ignorance from the patient's behalf (10.6%), change in clinical status (7.9%), prolongation of previous operations (7%), patient’s dissatisfaction (5.8%), Patients' incomplete Nil Per Os (NPO) time (5.5%), inadequate equipment (4.6%), lack of lab tests and consultations (2.7%), diagnosis change (2.4%), surgeon's absence (1.8%), and incomplete admission documents (0.6%).
Conclusion: In a high percentage of canceled cases, the reasons of operation cancellations had not been mentioned in the patient’s file. A significant portion of theses cancellations can be attributed to the patients' incomplete cooperation. Cancellations can be significantly reduced through providing the patient with enough instructions and explanations.- انتشار مقاله: 20-03-1393
- نویسندگان: Hossein Ebrahimipour,Arash Shirdel,Mohammad Esmaeil Rahimi,Marzieh Meraji,Elaheh Hooshmand,Arefe Pourtaleb,Ebrahim Mohammad Pour,Ali Dehghani,Ali Vafaee Najar
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pharmaceutical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: hawthorn,Crataegus,Caffeic acid,Digital scanning profile,HPTLC fingerprint
- چکیده:
- چکیده انگلیسی: Eight samples of flowering tops from six species of the genus Crataegus L., commonly called Hawthorn, from different geographic locations of Iran were standardized according to German Pharmacopoeia monograph on Crataegi folium cum flore (hawthorn leaf with flower) by high-performance thin-layer chromatograph-ic (HPTLC) fingerprinting combining with digital scanning profiling of their major polyphenolics as flavonoids and phenol carboxylic acids (PCAs). All of the species, except one, contained rutin and hyperoside as flavonoids, and chlorogenic and caffeic acid as PCAs in their flowering tops samples. HPTLC fingerprinting, rather than conventional TLC in the DAB 1997 hawthorn monograph, gave faster and more efficient qualitative and quantitative analysis of hawthorn plant material and their extracts that was appropriate for standardization of Crataegus spp. The corresponding digital scanning profiling provided an easy way for quantitative comparisons among the species. The HPTLC fingerprint is also suitable for rapid and simple authentication and comparison of subtle differences among samples of identical plant resource, but from different geographic locations.
- انتشار مقاله: 22-11-1385
- نویسندگان: Yaghoub Amanzadeh,Mahnaz Khanavi,Mahboube Khatamsaz,Afsaneh Rajabi,Seyed Esmaeil Sadat Ebrahimi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Basic Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: acetylcholinesterase,coumarin,Alzheimer’s disease,Benzoheterocycles Butyrylcholinesterase
- چکیده:
- چکیده انگلیسی: Objective(s): To investigate the efficiency of a novel series of coumarin derivatives bearing benzoheterocycle moiety as novel cholinesterase inhibitors.
Materials and Methods: Different 7-hydroxycoumarin derivatives were synthesized via Pechmann or Knoevenagel condensation and conjugated to different benzoheterocycle (8-hydroxyquinoline, 2-mercaptobenzoxazole or 2-mercaptobenzimidazole) using dibromoalkanes 3a-m. Final compounds were evaluated against acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) by Ellman's method. Kinetic study of AChE inhibition and ligand-protein docking simulation were also carried out for the most potent compound 3b.
Results: Some of the compounds revealed potent and selective activity against AChE. Compound 3b containing the quinoline group showed the best activity with an IC50 value of 8.80 µM against AChE. Kinetic study of AChE inhibition revealed the mixed-type inhibition of the enzyme by compound 3b. Ligand-protein docking simulation also showed that the flexibility of the hydrophobic five carbons linker allows the quinoline ring to form π-π interaction with Trp279 in the PAS.
Conclusion: We suggest these synthesized compounds could become potential leads for AChE inhibition and prevention of AD symptoms.- انتشار مقاله: 13-03-1396
- نویسندگان: Kimia Hirbod,Leili Jalili-baleh,Hamid Nadri,Seyed Esmaeil Sadat Ebrahimi,Alireza Moradi,Bahar Pakseresht,Alireza Foroumadi,Abbas Shafiee,Mehdi Khoobi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Biotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Pomegranate,Anthocyanin biosynthesis,MYB transcription factor
- چکیده:
- چکیده انگلیسی: Background: Pomegranate fruit (Punica granatum L.) is a rich source of anthocyanin pigments resulting in vibrant colours and anti-oxidant contents. Although the intensity and pattern of anthocyanin biosynthesis in fruit are strongly influenced by R2R3-MYB transcription factors, little is known about the regulation and role of MYB in anthocyanin pathway of pomegranate. Objectives: The present study was conducted to elucidate the relationship between the expression of MYB transcription factor and the anthocyanin accumulation during the colour development phase of pomegranate fruits. Materials and Methods: In this work, R2R3-MYB transcription factor (PgMYB) was isolated and characterized from pomegranate skin through RACE-PCR. The expression of PgMYB gene was monitored in three distinct pomegranate accessions with distinctive skin colour and pattern by semi-quantitative RT-PCR. Results: The results indicated a strong association between skin colour in mature pomegranate fruits with the PgMYB transcripts. The highest expression level of PgMYB gene was observed in Poost Siyah Yazd (dark purple skin) throughout the ripening process. Furthermore, comparison of PgMYB amino acid sequences with those of R2R3-MYB family in grapevine, eucalyptus, peach, cacao, populus and Arabidopsis demonstrated that this protein shares high similarity (75-85% amino acid identity) with their conserved MYB domain. Computational structure prediction of PgMYB showed that the three conserved amino acids (Asn, Lys and Lys) are present in the same position of the MYB domain. Conclusions: It is speculated that PgMYB gene influences the fruit colour and could be used to improve the accumula-tion of anthocyanin pigments in the pomegranate fruit.
- انتشار مقاله: 01-08-1393
- نویسندگان: Ghazale Khaksar,Badredin Ebrahim Sayed Tabatabaei,Ahmad Arzani,Cyrus Ghobadi,Esmaeil Ebrahimie
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Graphene Oxide,Multi-Walled Carbon Nanotubes,Sorption process,Acid Mine Drainage,Sungun Copper Mine
- چکیده:
- چکیده انگلیسی: The sorption efficiencies of graphene oxide (GO) and functionalized multi-walled carbon nanotubes (f-MWCNTs) were investigated and elucidated to study their potential in treating acid mine drainage (AMD) containing Cu2+, Mn2+, Zn2+, Pb2+, Fe3+ and Cd2+ metal ions. Several layered GO nanosheets and f-MWCNTs were formed via the modified Hummers’ method and the acid treatment of the MWCNTs, respectively. The prepared nanoadsorbents were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transformed infrared (FTIR) spectroscopy, and BET surface area analysis. The batch method was utilized to evaluate the pH effect, sorption kinetics and isotherms. The results demonstrated that the sorption capacities of the MWCNTs increased greatly after oxidation and those of the GO decreased after reduction. Hence, the sorption mechanisms seemed principally assignable to the chemical interactions between the metal ions and the surface functional groups of the adsorbents. Additionally, the adsorption isotherm results clearly depicted that the adsorption of the Cu2+ ion onto the GO adsorbent surface was well fitted and found to be in good agreement with the Langmuir isotherm model as the obtained regression constant value (R2) was found to be 0.9981. All results indicated that GO was a promising material for the removal of toxic metal ions from aqueous solutions in actual pollution management.
- انتشار مقاله: 17-11-1395
- نویسندگان: Esmaeil Rahimi,Esmaeil Rahimi,Esmaeil Rahimi
- مشاهده