Esfahan University

Eşfahān, Iran

Esfahan University

Eşfahān, Iran
SEARCH FILTERS
Time filter
Source Type

Abbasi H.,Shahid Bahonar University of Kerman | Shafighzadeh H.,University of Tehran | Rahimi A.,Esfahan University
Iranian Journal of Biotechnology | Year: 2011

The continuous production of polygalacturonases (PGases) that Exo-polygalacturonase (exo-PGase) and Endo-polygalacturonase (endo-PGase) are two members of this group by a strain of Aspergillus awamori in surface culture fermentation was investigated. Surface culture fermentation is usually done in batch mode. Wheat flour acted as a good substrate for the cultivation of the fungus and production of PGases in surface culture fermentation. Fermentation started in batch mode until mycelia completely occupied the medium following growth of the microorganism, after which it was turned to the continuous mode by the introduction of fresh feed. The process continued for 34 days, and the thickness of the microbial layer on the surface of the liquid medium became almost constant after approximately one week. The production of PGases, however, continued throughout the experiment, and maximum activities of 1.2 U/ml and 0.014 U/ml were obtained for exo-polygalacturonase (exo-PGase) and endo-polygalacturonase (endo-PGase), respectively. An increase in production was observed when a similar system was used with a line for medium recycling. Lowering the residence time to 12 h decreased the exo-PGase and endo-PGase activities. Reducing the residence time from 24 h to 12 h almost halved the concentrations of the enzymes at the outlet.


Mansoori H.,Esfahan University | Taheridemne M.,University of Tehran | Monfared A.R.K.,University of Yazd
Iranian Journal of Information Processing Management | Year: 2012

This research provided a model for evaluating the effect of knowledge management strategy on human resource management performance in higher education institutes and academic libraries. This research was a descriptive survey. According to the research literature and expert opinions, in human resource level, 38 indicators were produced for evaluating KM, then these indicators were classified in 10 total factors in terms of balanced scorecard approach. The results of evaluating knowledge management in Yazd academic libraries showed that, this strategy on customer perspectives, internal processes, learning and growth perspective had a good performance. But in terms of financial and Labor productivity indicators and training programs it did not have a good outcome for Yazd academic libraries.


Vega F.J.,National Autonomous University of Mexico | Gholamalian H.,Hormozgan University | Bahrami A.,Esfahan University
Palaontologische Zeitschrift | Year: 2010

Four decapod crustacean species from the Middle Miocene Mishan Formation of Hormozgan Province, Southern Iran are described. Three species of leucosiid crabs represent the first fossil record for their respective genera outside the Indo-Pacific region. The oldest records for Leucosiasensu lato, Phylirasensu lato, and Arcania are from Middle Miocene deposits of the Indo-Pacific, and thus their paleobiogeographic distribution is extended for this lapse of time. Harpactocarcinus miocenicus n. sp. represents the youngest and most oriental occurrence for a typically Eocene genus, whose species are known mainly from Central Europe. This contribution represents the first formal report for Tertiary crustaceans from Iran. © 2010 Springer-Verlag.


Nili-Ahmadabadi H.,Esfahan University | Khorsandi A.R.,Esfahan University
Chinese Physics B | Year: 2011

We have generated a second-harmonic generation (SHG) of a Q-switched microchip Nd:YAG laser on the surface of a periodically poled LiNbO3 (PPLN) nonlinear crystal near the grazing incidence angle. Three individual SHG waves as transmitted homogeneous, inhomogeneous and reflected radiations have been generated and their intensities are measured and characterized within a desirable range of about 10 different incidence angles of the Nd:YAG laser as pump source on the PPLN surface. The basic of surface nonlinear radiation is also investigated and similar results are calculated and extracted from the theory. Comparison between calculated and measured data shows that they are in good agreement with each other. © 2011 Chinese Physical Society and IOP Publishing Ltd.


Khorsandi A.,Esfahan University | Sabouri S.G.,Esfahan University | Fathi S.,Esfahan University | Asadnia-Jahromi M.,Esfahan University
Optics and Laser Technology | Year: 2011

We have reported a modified V-shaped external cavity, which is constructed around a commercial diode laser operating at a center wavelength of λ=785 nm by adding a new coated glass plate with about 50% reflectivity to the cavity. This allows simultaneous dual-wavelengths operation in the vicinity of Δνmin=0.18 THz to Δνmax=0.22 THz, which can be used as laser source for terahertz generation either for semiconductor devices or nonlinear schemes. © 2010 Elsevier Ltd. All rights reserved.


Ameri H.,Kerman Graduate University of Technology | Dastanpour M.,Kerman Institute of Higher Education | Khalilizade H.,Payame Noor University | Zamani F.,Esfahan University
Arabian Journal of Geosciences | Year: 2014

Abundant and well-preserved assemblages of plant macrofossils occur from the Hojedk Formation at Babhutk, Kerman, Iran. This new locality is the first in the Jurassic of Kerman where the plant material is shown preserved. Eight species of seven genera were identified representing five different gymnosperm groups: Nilssonia cf. undulata, Nilssonia cf. orientalis, Elatides sp., Podozamites sp., and Williamsonia asseretoii and two pteridophyt groups: Equisetites laterale and Coniopteris sp. The collected flora suggests subtropical conditions at the time of deposition of the Hojedk Formation. Based on stratigraphical distributions of the encountered macrofossils, Bajocian-Bathonian age is suggested for the lower and middle unit of the Hojedk Formation. These plant fossils help confirm conclusions from recent geological studies that place the Kerman Basin of Iran during the Jurassic. © 2013 Saudi Society for Geosciences.


Enshaeieh M.,Islamic Azad University at Falavarjan | Nahvi I.,Esfahan University | Madani M.,Islamic Azad University at Falavarjan
International Journal of Environmental Science and Technology | Year: 2014

Production of microbial oil has attracted a great attention in recent years. The potential of lipid production by the yeast strains is the reason for using microorganisms for biodiesel production. Microbial lipid has high similarity to the oil obtained from plants and animals in type and composition. Production of oil from yeasts must be economical, so optimization of the cultivation condition to reach higher production must be done. Native oleaginous yeast, Cryptococcus albidus, was isolated from soil by the nitrogen-limited medium and screened by Nile red staining. Yarrowia lipolytica DSM 8218 was used for lipid production as a standard strain. C. albidus was an excellent oleaginous yeast, and the lipid quantity, dry biomass and lipid productivity of this strain were 11.81 g/l, 19.65 g/l and 60.1 %, respectively, in shaking flask cultivation at 150 rpm and 25 °C in nitrogen-limited medium containing per liter 75 g glucose, 1 g (NH4)2SO4, 1 g yeast extract, 3 g KH2PO4, 1.5 g MgSO4.7H2O, 0.15 g CaCl2, 0.06 g MnSO4.H2O, 0.02 g ZnSO4.7H2O and 0.15 g FeCl3.6H2O with pH adjusted to 6.5. Fourier transform infrared spectroscopy was used for analyzing and confirming the production of microbial oil in this study. © 2013 Islamic Azad University (IAU).


Rezaei M.,Esfahan University
WSEAS Transactions on Communications | Year: 2010

The main goal of this paper is to present a theory, named Imaginary Relativity, which completes Einstein's Relativity Theory. According to the recommended theory in this paper, the speed of light is not constant and absolute in an inertial frame. On the other hand, the speed of a light pulse in an inertial frame, moving with velocity u, equals to an imaginary value instead of the constant value c as it is considered in Einstein's Relativity Theory.


Ansari H.V.,Esfahan University
Advanced Studies in Theoretical Physics | Year: 2012

It is shown that contrary to this current belief that the electrostatic potential difference between the two conductors of a capacitor is the same potential difference between the two poles of the battery which has charged it, the first is two times more than the second.


Ansari H.V.,Esfahan University
Advanced Studies in Theoretical Physics | Year: 2012

It is shown that as Newton's third law holds in static discussions of Electromagnetism it holds also in dynamic discussions of it, ie where the motion of electric charge in the magnetic field arising from the magnetic static (or magnetostatic) poles is under consideration. As we know, there is some force exerted on a current-carrying wire in the magnetic field of a magnet. It is shown that this magnet is in fact the same enlarged magnetic needle in Oersted's experiment, and then there exists also some force exerted on the magnet due to the electric current in the wire. These two action and reaction forces are in opposite directions. We consider point magnetic charges as the sources of the magnetostatic fields, like the point electric charges for the electrostatic fields. Forms of the mutual effects of electric and magnetic charges on themselves and on each other are presented in the forms of vectorial relations. Using these relations, incorrectness of a usual manner which eventually leads to the deviation from the classical physics and to the rejection of the Galilean transformations is shown.

Loading Esfahan University collaborators
Loading Esfahan University collaborators