Showing 5 results for Mehrban
S. Mehrban , M. Bahreini , A. Asoodeh , B. Korozhdehi,
Volume 10, Issue 4 (Fall 2019)
Abstract
Aims: Significant amounts of waste, including feathers, bones, blood, etc. are yearly produced by the poultry industry. Feathers are composed of 90% keratin protein, and the rest is composed of lipids and water. Keratinases are one of the most diverse and usable enzymes, which can be produced by bacterial and fungal microorganisms. These enzymes show a wide range of application in various fields.
Materials and Methods: In this study, the keratinolytic activity of the isolated strain from a poultry farm in Mashhad was evaluated and then the medium conditions for keratinase production were optimized. The strains were identified based on the morphological and biochemical methods. 16SrRNA gene of the strain was amplified by PCR and then sequenced. The strain proteolytic activity was examined and compared with its keratinolytic activity. Finally, strain growth ability tested in variety substrate.
Findings: Using 16SrRNA gene sequencing, morphological and biochemical identification, the strain shared 99.9% similarity with Bacillus mojavensis. Optimization of various factors, including temperature, pH, incubation time, carbon and nitrogen sources, aeration and inoculum size showed that the isolated strain has the highest keratinolytic activity at 37°C, 48 hour incubation period, pH=9.5, sucrose 1%, 3% substrate, aeration 75% and 6% (v/v) inoculum amount. None of the nitrogen sources had a positive effect.
Conclusion: The FUM-1 keratinolytic activity was increased approximately 3.38 fold by condition optimization of the medium, indicating the importance of environmental conditions. In the study, the strain with high keratinolytic activity was suggesting its potential use in biotechnological.
Volume 12, Issue 1 (5-2012)
Abstract
The importance of productivity has made it to be one of the most serious discussions in industrial organizing. In economic literature, however, there are some arguments on the role of market structure in productivity changes. While some theorists point out that more competition leads to higher productivity, others believe that monopoly environment would be more efficient. This study examines the effect of competition- that is measured by the number of firms- on labor productivity in the Iranian industries. Using the panel data from the firms hiring 10 employees or more, the results suggest that monopoly and private ownership provide a more suitable environment for reaching higher productivity.
Leila Pourhang, Zahra Ghorbanzadeh, Mehrbanoo Kazemi Alamuti, Seyyed Mohammad Mousavi Pakzad, Elahe Moatamed, Mona Mapar, Aliakbar Ebadi, Mohammad Reza Ghaffari*, Katayoun Zamani, Ghasem Hosseini Salekdeh, Behzad Ghareyazie, Motahhareh Mohsenpour,
Volume 14, Issue 1 (FALL 2023)
Abstract
Production of drought tolerant crop is an important strategy for avoiding water scarce crisis. Improvement of the root structure leading to the higher yield and seed quality. In this study, three genes affecting root structure, drought tolerance and phosphorous absorbance are used in producing hybrid constructs used for the rice transformation. Three genes: a serine/threonine protein kinase (PSTOL1), a gene from the cytokinin oxidase/dehydrogenase family (OsCKX4) and a transcription factor induced under stress from the NAM-ATAF-CUC family (OsNAC5) isolated from the rice wild cultivars are cloned under separate regulatory elements in the T-DNA region of the Agrobacterium binary vector. OsNAC5 gene was cloned under RCc3 root specific promoter and PSTOL1 gene under ubiquitin promoter. Also, OsCKX4 gene was cloned once under ubiquitin promoter and once under RCc3 promoter. Two hybrid multi-gene constructs named pUhrN5CkPstol and pUhrCkPstol harboring multiple genes are synthetized and used for the gene transformation into the Hashemi cultivar. Gene transfer was done to callus obtained from mature rice seeds. Transgenic plants were confirmed using PCR analysis. From the number of 107 regenerated plants in which the presence of transgenes was proved, 14 transgenic events were finally obtained. Root structure of the T0 plants showed drastic phenotypic difference in comparison to the non-transgenic ones. By now, one transgenic event harboring CKX4 and PSTOL1 is confirmed to have a homozygous line in T2 generation. It is hoped that genetic engineering of rice for enhanced root structure lead to drought tolerance, reduce water consumption and improve yield under stress conditions.
Volume 15, Issue 3 (Autumn 2015 2015)
Abstract
Inequality in income and wealth distribution as the most critical socioeconomic indicator is highly influenced by political structure. In the recent centuries, democratization along with enfranchisement has caused a course of economic changes including income and wealth redistribution. This study uses a neoclassical microeconomic approach for a hypothetical economy and demonstrates how to being affected incomes inequality and redistribution by enfranchisement in a society whose economic and political power pillars are under control of aristocrats. Theoretical analysis suggests that expansion of democracy leads to less inequality in incomes. Empirical evidence from Iran for the period 1969-2008 indicates that democracy can be a significant determinant in income redistribution.
Volume 17, Issue 1 (Spring 2017 2017)
Abstract
The trade-off between the quantity and quality of children is one of the topics in family economics with crucial implications in fertility and determination of family size. This paper aims to answer this question: does educational quality of children decrease due to increase in the number of children of a typical family? The microeconomic analysis of this matter implies the existence of such trade-off. This analysis confirms that the rising price of demand for child due to the increase in women’s education level leads to the lower quantity but higher quality of children. The results based on 1294 observations from primary school students in Tehran show that an increase in family size leads to a statistically significant fall in average scores as an educational measure and math point as talent measure of students. Additionally, it is shown that women’s employment has negative effect on educational achievement of their children, while higher parental schooling and family income lead to better educational performance of them. How to feed children is the other interfamily feature, which helps to develop mental ability of children.
