Showing papers by "Bu-Ali Sina University published in 2008"
TL;DR: In this paper, the effect of time on lead (Pb), zinc (Zn), cadmium (Cd), and copper (Cu) availability in some calcareous soils of Iran was investigated.
172 citations
TL;DR: The results showed that degradation of this fungicide can be conducted in the both processes of only UV-irradiation and UV/TiO(2); however, the later provides much better results.
160 citations
TL;DR: The Brevicompactum clade is recognized as a separate lineage in Trichoderma/Hypocrea and the new species T. arundinaceum is identified, which produces peptaibiotics, including alamethicins.
Abstract: The Brevicompactum clade is recognized as a separate lineage in Trichoderma/Hypocrea. This includes T. brevicompactum and the new species T. arundinaceum, T. turrialbense, T. protrudens and Hypocrea rodmanii. The closest relative of the Brevicompactum clade is the Lutea clade. With the exception of H. rodmanii, all members of this clade produce the simple trichothecene-type toxins harzianum A or trichodermin. All members of the clade produce peptaibiotics, including alamethicins. Strains previously reported as T. harzianum (ATCC 90237), T. viride (NRRL 3199) or Hypocrea sp. (F000527, CBS 113214) to produce trichothecenes are reidentified as T. arundinaceum. The Brevicompactum clade is not closely related to species that have biological application.
141 citations
TL;DR: Silica sulfuric acid as a heterogeneous reagent catalysed eco-friendly and efficient synthesis of 2,3-dihydroquinazolinones by the reaction of isatoic anhydride, a primary amine or ammonium acetate and an aromatic aldehyde in water or under solvent-free conditions.
113 citations
TL;DR: In this paper, the average exchangeable sodium percentage (ESP) of the soils increased during leaching from 9 to 21 and 28.8 to 29.7 after applying 5.0 and 3.5 l of wastewater to the soil columns, respectively.
108 citations
TL;DR: In this article, three different radiation models (Sabbagh, Paltridge, Daneshyar) have been revised to predict the climatology of monthly average daily solar radiation on horizontal surfaces in various cities in central arid deserts of Iran.
97 citations
TL;DR: For the first time a theoretical interpretation based on SRT has been provided for the modified pseudo-first-order (MPFO) kinetic equation which was proposed empirically by Yang and Al-Duri and shown that the MPFO kinetic equation can be derived from the SRT equation when the system is close to equilibrium.
Abstract: The kinetics of solute adsorption at the solid/solution interface has been studied by statistical rate theory (SRT) at two limiting conditions, one at initial times of adsorption and the other close to equilibrium. A new kinetic equation has been derived for initial times of adsorption on the basis of SRT. For the first time a theoretical interpretation based on SRT has been provided for the modified pseudo-first-order (MPFO) kinetic equation which was proposed empirically by Yang and Al-Duri. It has been shown that the MPFO kinetic equation can be derived from the SRT equation when the system is close to equilibrium. On the basis of numerically generated points (t, q) by the SRT equation, it has been shown that we can apply the new equation for initial times of adsorption in a larger time range in comparison to the previous q vs √t linear equation. Also by numerical analysis of the generated kinetic data points, it is shown that application of the MPFO equation for modeling of whole kinetic data causes a...
84 citations
TL;DR: Effect of loading of C-cloth with ethylenediaminetetraacetic acid (EDTA) on the adsorption capacity for the advertisersorption of several metal cations was studied and it was found that for most of the investigated cations Langmuir model was more successful.
78 citations
TL;DR: In this article, a simple, catalytic and highly chemo and homoselective oxidation of sulfides to sulfoxides using supported HNO3 on silica gel and poly vinyl pyrrolidone (PVP) in the presence of a catalytic amount of KBr or NaBr was described.
77 citations
TL;DR: In this paper, the vibrational response of two well-known single-walled carbon nanotubes, zig-zag and arm-chair, is investigated by numerical simulation using finite element method.
73 citations
TL;DR: Although further studies are needed to clarify the mechanisms of ischemic tolerance, the intermittent and prolonged HO seems to partly exert their effects via increase serum TNF-alpha levels and upregulation of EAATs.
TL;DR: In this article, a set of physico-chemical experiments and XRD tests were performed to investigate the process of ettringite formation and to explore its possible performance in clayey soils.
TL;DR: In this article, the behavior of dihydroxybenzoic acid and catechol derivatives in the presence of indole (3 ) as nucleophile using cyclic voltammetry and controlled-potential coulometry methods is described.
TL;DR: Silica sulfuric acid catalyzes efficiently the reaction of sulfonamides with both carboxylic acid anhydrides and chlorides under solvent-free and heterogeneous conditions, and this method is attractive and in a close agreement with green chemistry.
TL;DR: In this paper, the effect of sodium adsorption ratio (SAR) and Ca:Mg ratio of water on K release of some calcareous soils in western Iran was determined.
TL;DR: The results of this research showed that there are some hyper accumulator plants in this area that can concentrate heavy metals in their different parts thus they can be used for remediation of polluted area.
Abstract: The aim of present study was to identify accumulator plants that are effective for phytoremediation. We chose a mine of Iron and Copper named Hame Kasi that located western north of Hamedan city as a polluted area. In this region concentration of heavy metals is several times more than non-polluted area. Seventeen plant species and 6 soil samples were collected from this region for determination of heavy metals content. Atomic Absorption Spectrophotometer (AAS) was used for analysis of heavy metals in soil and plant samples, then tested plant species were grouped on the basis of their accumulation capability of heavy metals. The results of this research showed that there are some hyper accumulator plants in this area that can concentrate heavy metals in their different parts thus they can be used for remediation of polluted area.
TL;DR: A series of Mn(II) macrocyclic Schiff-base complexes [MnL n Cl] + (n ǫ = 1/4) have been prepared via the 1+1 cyclocondensation of 2,6-diacetylpyridine or 2.6-pyridinedicarbaldehyde with the symmetrical 1,4-bis(3-aminopropyl)piperazine or the novel asymmetrical N, N ′(2-aminoethyl)(3-polymorphic) piperazine linear amines
TL;DR: In this article, a simple, rapid and efficient method for the preparation of benzoxazoles, benzimidazoles and oxazolo[4,5-b]pyridines from the reaction of orthoesters with o-aminophenols, o-phenylenediamine and 2-amino-3-hydroxypyridine in the presence of silica sulfuric acid under heterogeneous and solvent-free conditions is reported.
Abstract: A simple, rapid and efficient method for the preparation of benzoxazoles, benzimidazoles and oxazolo[4,5-b]pyridines from the reaction of orthoesters with o-aminophenols, o-phenylenediamine and 2-amino-3-hydroxypyridine in the presence of silica sulfuric acid under heterogeneous and solvent-free conditions is reported. The significant features of this method are short reaction times, high yields of the products, mild reaction conditions, solvent free reaction, cheapness, non-toxicity and reusability of the catalyst.
TL;DR: A cloud-point extraction process using micelle of the cationic surfactant CTAB to extract Mo(VI) from aqueous solutions was investigated and the analytical characteristics of the method obtained.
TL;DR: The application of modified silica gel to preconcentration of investigated cation from tap water, lake water, urine and apple leaves gave high accuracy and precision (relative standard deviation (R.S.D.) <3%).
TL;DR: In this paper, the synthesis of quinoline derivatives via Friedlander method from ortho-aminoaryl ketones in the presence of a catalytic amount of silica sulfuric acid (SSA) under solvent-free condition and microwave irradiation was described.
Abstract: The synthesis of quinoline derivatives via Friedlander method from ortho-aminoaryl ketones in the presence of a catalytic amount of silica sulfuric acid (SSA) under solvent-free condition and microwave irradiation was described. A good range of simple ketones such as cyclohexanone and deoxybenzoin were used.
TL;DR: In this paper, the synthesis of 2-oxazolines and 2-imidazoline from the reaction of nitriles with β-aminoalcohols and ethylenediamine (EDA), using silica sulfuric acid as a heterogeneous catalyst under reflux conditions is reported.
TL;DR: In this article, surface soil samples from calcareous soils of industrial areas in Hamadan Province, western Iran were analyzed for total concentrations of Zn, Cd, Ni, Cu and Pb and were sequentially extracted into six fractions to determine the bioavailability of various heavy metal forms.
Abstract: Eleven surface soil samples from calcareous soils of industrial areas in Hamadan Province, western Iran were analyzed for total concentrations of Zn, Cd, Ni, Cu and Pb and were sequentially extracted into six fractions to determine the bioavailability of various heavy metal forms. Total Zn, Cd, Ni, Cu and Pb concentrations of the contaminated soils were 658 (57–5,803), 125.8 (1.18–1,361), 45.6 (30.7–64.4), 29.7 (11.7–83.5) and 2,419 (66–24,850) mg kg−1, respectively. The soils were polluted with Zn, Pb, and Cu to some extent and heavily polluted with Cd. Nickel values were not above regulatory limits. Copper existed in soil mainly in residual (RES) and organic (OM) fractions (about 42 and 33%, respectively), whereas Zn occurred essentially as RES fraction (about 69%). The considerable presence of Cd (30.8%) and Pb (39%) in the CARB fraction suggests these elements have high potential biavailability and leachability in soils from contaminated soils. The mobile and bioavailable (EXCH and CARB) fractions of Zn, Cd, Ni, Cu, and Pb in contaminated soils averaged (7.3, 40.4, 16, 12.9 and 40.8%), respectively, which suggests that the mobility and bioavailability of the five metals probably decline in the following order: Cd = Pb > Ni > Cu > Zn.
01 Jan 2008
TL;DR: Some of the main factors that influence Agrobacterium-mediated genetic transformation are reviewed and their possible roles in this process are discussed.
Abstract: Plant transformation technology has become a versatile platform for cultivar improvement as well as for studying gene function in plants. The development of an efficient method for genetic transformation is a prerequisite for the application of molecular biology to the improvement of a given crop species. Agrobacterium-mediated genetic transformation is the dominant technology used for the production of genetically modified transgenic plants. Extensive research aimed at improving the molecular machinery of Agrobacterium responsible for the generation and transport of the bacterial DNA into the host cell has resulted in the establishment of many recombinant Agrobacterium strains and technologies currently used for the successful transformation of numerous plant species. Many factors influencing Agrobacterium-mediated transformation of plants have been investigated and elucidated. These factors include bacterial strains and cell density, plant species and genotype, plant growth regulators and antibiotics, explant, explant wounding, light and temperature. Before attempting stable transformation of any new species, it is useful to optimize the factors influencing transformation efficiency, as this can reduce future costs in labor and materials. The studies of such factors hold great promise for the future of plant biotechnology and plant genetic engineering as they might help in the development of conceptually new techniques and approaches needed today to expand the host range of Agrobacterium and to control the transformation process and its outcome during the production of transgenic plants. Here, I review some of the main factors that influence Agrobacterium-mediated genetic transformation and discuss their possible roles in this process.
TL;DR: Diesel exhaust particles are considered as the most important parts of air pollutants and can carry pollen allergen molecules, induce new proteins (allergens), and also act as adjuvant for allergens.
15 Aug 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the ballistic limit velocity, energy dissipation and damaged zone of metallic honeycombs at normal impact are studied experimentally and compared with analytical formulae, and the differences between predicted ballistic limits and experimental data are found to be less than 10%.
Abstract: Honeycombs are widely used as core structures in sandwich panels as energy absorbers. In this paper the ballistic limit velocity, energy dissipation and damaged zone of metallic honeycombs at normal impact are studied experimentally and compared with analytical formulae. In experiments aluminum 5052-H39 honeycombs are impacted by rigid steel cylindrical projectiles with a blunt nose. The ballistic limit velocities calculated from Alavi Nia's formulae [A. Alavi Nia, Ph.D. Thesis, Tarbiat Modarres University, 2002] show good conformity with experimental values. The differences between predicted ballistic limits and experimental data are found to be less than 10%. Energy studies show that folding of cell walls and shearing of plug have the main role in energy dissipation. The energy needed for folding of cell walls is about 71–85% of the initial kinetic energy of projectile. This quantity for shearing of plug is about 13–28%. The shearing of plug portion in energy dissipation is proportional to the second power of panel thickness, so that 25% growth in panel thickness results in 56.2% increase in the shearing of plug portion. The damaged zone formed by the projectile is almost circular in shape and its diameter is equal to the projectile diameter on the impacted side of the panels, but on the rear side of the panel the damage is elliptical in shape and its diameter is about 1.5–3 times of the projectile diameter.
TL;DR: In this article, a vibrating u-tube densimeter was used to measure the excess molar enthalpy ( ∂H m E ǫ/ǫ ∂P ) T,x for binary mixtures of (1,propanol+2,2)-propanediol and (2,Propanol-1,2-propanenediol) over the entire range of compositions.
TL;DR: In this article, the authors examined the effect of sodium adsorption ratio (SAR) of irrigation water on nutrients leaching and groundwater quality in columns of sandy soil, and found that high SAR was less pronounced in solution having low SAR.
Abstract: Sodium (Na+) in poor quality irrigation water participate in ion-exchange processes results in the displacement of base cations into solution and a raised concentration in groundwater. Knowledge of the rate of decrease of nutrients from soils resulting from poor water quality application is essential for long-term planning of crop production while minimizing the impact on groundwater quality. In this study, we examined the effect of sodium adsorption ratio (SAR) of irrigation water on nutrients leaching and groundwater quality in columns of sandy soil. Three types of irrigation waters at three NaCl–CaCl2 solutions with the following levels of SAR (5, 15, and 30) were synthesized in laboratory. With the application of solutions, exchange occurred between solution Na+ and exchangeable cations (Ca2+, Mg2+, and K+), resulting in the displacement of these cations and anions into solution. Increasing the level of SAR from 5 to 15 and 30 resulted in increase in the average exchangeable sodium percentage (ESP) of the soil from 10.4 to 20.3, and 32.5, respectively. Adverse effect of high Na+ concentration in the solutions on raising ESP was less pronounced in solution having low SAR. Leaching of Ca2+, Mg2+, K+, and P from soil with the application of solutions represents a significant loss of valuable nutrients. This sandy soil showed the high risk for nutrients transfer into groundwater in concentrations exceeding the groundwater quality standard. Irrigation with poor quality water, which is generally more sodic and saline than regional groundwater, increases the rate of sodification and salinization of shallow groundwater.
TL;DR: In this paper, the authors presented novel and very simple spectrophotometric methods by ratio spectra-continuous wavelet transformation for the simultaneous determination of ternary mixtures of calcium, magnesium and zinc without prior separation steps.
TL;DR: In this paper, the authors proposed the first description of the competitive adsorption kinetics at the solid/solution interface based on the statistical rate theory (SRT) approach.
Abstract: Removal of pollutants from aqueous solution is an important process, and adsorption is one of the most popular methods for this. Wastewater usually contains several solutes, and therefore the adsorption process in some systems is competitive. The lack of an adequate model for kinetics of competitive adsorption and also difficulties in modeling led only to the reporting of experimental data in most publications. Here we propose the first description of the competitive adsorption kinetics at the solid/solution interface based on the statistical rate theory (SRT) approach. For derivation of rate equations based on the SRT approach, at first we derived the chemical potential of adspecies for a competitive adsorption based on statistical thermodynamics from the partition function of a canonical ensemble. The derived kinetic equations for competitive adsorption are able to describe quantitatively the kinetics of some experimental data. Since the analytical solution of the derived rate equations led to complex e...