Showing 9 results for Baghaei
Volume 3, Issue 3 (fall 2022)
Abstract
Description: Integrity of urban facades greatly influences the order of urban view and landscape. Facades themselves have various components and aspects. The structural quality and layout of said aspects and components requires integrity, whether in a single façade, in conjunction with neighboring facades or in the total urban scale. This integrity requires regulations and principles the effectiveness of which is the focus of this study.
Objective: Evaluating the effectiveness of façade construction regulations enforced by municipalities and other competent authorities in the 1968-2021 period, concerning the integrity of urban facades and their components.
Method: This is a qualitative study with an exploratory-descriptive approach and a critical attitude. Initially the most effective urban façade integrity parameters were determined. Next, the façade construction regulations of the research period were analyzed. After that, every provision of the regulations was analyzed in comparison versus each integrity parameter.
Findings: The most effective and comprehensive set of regulations was the spring 2014 Façade Design regulations in Tehran. Among the integrity parameters, visual appeal and after that, content communications, materials and meaning were most affected by regulations. On the other hand, the least affected parameters were the harmony between façade and context, body silhouettes, and the transverse proportions of pieces.
Conclusion: The façade construction regulations are increasingly inclusive and expressive toward the integrity of urban facades; however, they still require further additions and improvements.
Volume 7, Issue 4 (Fall 2021)
Abstract
Backgrounds: Celiac disease (CD) is a common autoimmune disorder caused by intolerance to gliadin protein found in wheat, rye, and barley, which is prevalent among 1% of people in different parts of the world. Thus, in the last decades, the demand for gluten-free products has increased. The aim of the present study was to demonstrate the degradation of wheat gluten in laboratory.
Materials & Methods: Yeast colonies obtained from cloning were assessed for the presence of Saccharomyces cerevisiae with protease activity and then inoculated onto MSM (mineral salts medium) with 1% (w/v) gliadin. Aspergillus niger-derived prolyl endoprotease (AN- PEP ) production was also qualitatively examined on gliadin agar plates by determining yeast colony growth. Zones of clarification of gliadin around yeast colonies were regarded as the evidence of glutenase activity of AN- PEP . The qualitative effects of aspergillopepsin expressed in bakery yeast were studied on yeast gliadin and the rheological properties of wheat flour dough. The rheological properties of the dough were investigated by a rheometer.
Findings: In this survey, gluten was efficiently degraded into short fragments by the AN-PEP enzyme. The results of rheometer test showed that the use of AN-PEP could affect the rheological properties. The quality of dough and the ability of AN-PEP to degrade gluten in dough into smaller fragments were confirmed.
Conclusion: The current study gives evidence that in the future, the development of novel gluten-free products with high quality and taste is possible by degrading gluten protein into non-toxic peptides using a variety of AN-PEP enzymes.
Volume 11, Issue 2 (Vol. 11, No. 2 (Tome 56), (Articles in Persian) 2020)
Abstract
Conditional sentence is a compound sentence consisting of two clauses: protasis and apodosis. The purpose of this paper is investigating the conditional sentences in contemporary Persian language based on the Declerck and Reed typology (2001). According to this semantic typology, possible world of protasis is divided in to two factual and theoretical classes. Theoretical possible world can be neutral or nonneutral and the nonneutral is divided in to four types: closed, open, tentative and counterfactual. In the present study, we try to examine these types with respect to the corpus of 286 conditional sentences extracted from ten contemporary story books and the frequency of occurrence of each one to be determined separately. The analysis of Persian conditional sentences shows that the Persian conditional construction is compatible with mentioned typology and open possible world has the highest occurrence frequency, and the neutral, closed, factual, tentative and counterfactual possible worlds respectively dedicated the highest frequency of the open possible world. The higher frequency of occurrence of the open possible world arises from the fact that in this possible world a probabilistic situation is considered and there is no certainty about its occurrence and this interpretation is most consistent with the operation of the conditional construction. This study also shows that in addition to the common conditional conjunctions such as “ agar, be shartike, vaella, vagarna, ...” other conjunctions are also used as conditional conjunctions like : “ valo, farzan, hamin ke, be mojarade inke, vaghti, cheo…che, hala ke, ta, ke ….” .
Volume 16, Issue 89 (7-2019)
Abstract
Doogh is one of the most used fermented dairy drinks in Iran, whose durability and taste in the food industry is very important. The aim of this study was to investigate the antimicrobial effect of hydroalcoholic extract of salvia (Salvia officinalis), basil (Ocimum basilicum) and cinnamon on the durability of dough at ambient temperature.
Hydroalcoholic extracts of salvia, basil and cinnamon were extracted by maceration method. The antimicrobial effects of the extract of these three plants were determined by microdilution on yeast of Saccharomyces cerevisiae by determining minimum microbial inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), and then pH, acidity and antimicrobial effects of them in dough at ambient temperature over four weeks Checked out.
Based on the results of this study, the minimum inhibitory concentration of these extracts was between 6.25 and 12.5 mg/ml. Among studied extracts, salvia (Salvia officinalis), with a concentration of 0.62 mg/ml significantly decreased the yeast population of Saccharomyces cerevisiae in dough during four weeks (p<0.05). But basil (Ocimum basilicum) extract has only control effect and cinnamon extract has no antimicrobial effect.
Hydroalcoholic extract of salvia (Salvia officinalis), basil (Ocimum basilicum) and cinnamon can be used as an antifungal and antimicrobial agent as a natural preservative in dough and has an important role in consumer health.
Volume 16, Issue 91 (September 2019)
Abstract
Despite the relative success of different chemical compounds to improve meat tenderness, adverse effects caused by the use of these compounds on the physicochemical and sensory characteristics of meat, have led to restrictions on their use on an industrial scale. Therefore, in order to prevent these undesirable chemical effects, the application of some natural tenderizers has been considered. Natural meat tenderizers, are substances in those fruits and vegetables containing proteolytic enzymes such as cysteine protease, serine protease, metalloprotease and aspartic proteases. In this paper major biochemical changes that have led to meat tenderness, as well as proper plant sources used in tenderizing process have been reviewed.
Volume 18, Issue 112 (May 2021)
Abstract
In this study, the effect of different amounts of skim milk powder (SMP) (5 to 11.5%), milk protein concentrate (MPC) (1 to 5%) and soy flour (0 to 5%) on acidity, pH, viscosity and sensory characteristics (flavor, color and overall acceptance of concentrated yogurt were investigated using mixture design. The results of acidity and pH showed that increasing the MPC and SMP decreased the acidity and increased the pH of the sample significantly, while increasing soy flour increased the acidity and decreased the pH of the samples. The results of viscosity showed that only the linear effect of SMP and the MPC on the viscosity of samples was significant and increasing of SMP and MPC increased the viscosity of samples but soy flour had non-significant effect on the viscosity of the samples. The results of sensory score also showed that with increasing SMP and MPC, flavor, color and overall acceptance of samples increased significantly, but increasing soy flour decreased the sensory score. The results of variable importance in projection in PLS regression also showed that SMP had the highest positive significance and soy flour had the highest negative significance in terms of pH, viscosity, flavor score, color score and overall acceptance. The optimum formulation was obtained using numerical optimization algorithm in
in Design Expert software were SMP 9.8%, MPC 1.72% and soy flour 1%.
Volume 19, Issue 123 (May 2022)
Abstract
Oil has been one of the necessary ingredients for cooking around the world. As food industry proceed, better and more useful oils with their own characteristics are being offered to consumers every day. In the current research, in order to investigate the quality of soybean, frying and deodorized olive oils available in the Iranian consumer market, physicochemical parameters such as peroxide index, acidity, iodine index, saponification index, as well as their fatty acids profile and oxidative stability were determined and then compared. All physicochemical parameters except olive oil peroxide index were consistent with the standards. The peroxide index in olive oil (9.61 meqo2/Kg) indicated that olive oil was inappropriate for frying. 0.97 meqo2/Kg peroxide value was reported in soybean and frying oils. The fatty acids profile showed that oleic acid was the predominant fatty acid in olive oil, while in frying oil palmitic, oleic, and linoleic acids were significant. Also, linoleic acid in soybean oil as the predominant fatty acid was determined. The oxidative stability of frying and soybean oils, according to the Rancimat method, was higher than that of olive oil (P˂0.05).
Volume 19, Issue 123 (May 2022)
Abstract
The aim of this study was to prepare an active film based on polyethylene containing thymol and linalool (%0, 1, 1.5, 2) and use it as packaging in mozzarella cheese. For this purpose, the mechanical and barrier properties of the polyethylene films containing thymol and linalool were analyzed. The results showed that the use of thymol and linalool did not significantly reduce the oxygen permeability of the polyethylene film(p < 0.05). Water vapour permeability was significantly decreased by incorporating linalool and thymol ( 1.5, 2%). Tensile strength and elongation at break were significantly lower (p < 0.05) in polyethylene films containing thymol and linalool than in the control sample. Results show that mozzarella packed with polyethylene films containing thymol and linalool had higher pH and lower acidity than the control sample. The sensory analysis results revealed that coated cheese with polyethylene composed of linalool(1.5%) and thymol 2% was the most attention by panellists compared with others. Based on the results, films containing thymol and linalool improved the chemical and sensory properties of mozzarella cheese. Therefore, films treated with thymol and linalool can act as active packaging.
Volume 19, Issue 131 (January 2022)
Abstract
In order to increase the oxidative stability of oil, various antioxidants are used. The use of synthetic antioxidants causes concern for the health of consumers due to their carcinogenicity, so today the food industry seeks to use natural alternatives instead of synthetic types to improve the oxidative shelf life of oils. Therefore, the aim of this research was to investigate the possibility of using broccoli sprouts extract (BSE) as a natural antioxidant to develop the oxidative stability of soybean oil. Different levels of BSE, including 200, 400, and 800 ppm, were added to soybean oil and these samples were compared with samples without antioxidants (control) and sample containing TBHQ synthetic antioxidants (100 ppm). Different tests including acid, peroxide, anisidine, totox, thiobarbituric acid (TBA) indexes, and Rancimat number were performed on the oil samples during the accelerated storage period of 18 days at a temperature of 60 °C. The obtained results showed that during the storage period, the values of acid, peroxide, anisidine, totox, and TBA indexes of oil samples increased and the Rancimat number decreased significantly (p<0.05), however, the rate of these changes in the control sample was significantly higher than other samples. Adding BSE and increasing its concentration in the samples significantly reduced the rate of lipid oxidation and triglycerides decomposition in oils (p<0.05), and the highest oxidative stability was observed in the sample containing 800 ppm of BSE. This level of the BSE showed even higher antioxidant activity than the TBHQ synthetic antioxidant. Finally, the results of this study indicated the antioxidant activity of BSE in soybean oil, and therefore, this extract at the level of 800 ppm can be used as a natural antioxidant to develop the oxidative shelf life and stability of soybean oil.