Mehri Hashtroudi - Academia.edu (original) (raw)

Papers by Mehri Hashtroudi

Acta Physiologiae Plantarum

The impact of oil pollution on coastal vulnerable ecosystems has been a major concern especially,... more The impact of oil pollution on coastal vulnerable ecosystems has been a major concern especially, in the Persian Gulf area. The current study was carried out to assess to what extent Avicennia marina can tolerate oil contamination and degrade crude oil polycyclic aromatic hydrocarbons (PAHs) from rhizosphere soil. Seeds of A. marina were grown in control and crude oil-contaminated (2.5, 5.0, 7.5, and 10% w/w) soil under ambient greenhouse conditions. Four-month-old plants were collected, measured for their biometry, and assayed for physiological characteristics in relation to degradation of PAHs. A. marina exposed to petroleum responded by allocating proportionally more biomass to root than shoot, activating enzymatic and non-enzymatic antioxidative mechanisms and removing of PAHs, particularly in lower concentrations of crude oil in the soil. The content of total PAHs in A. marina rhizosphere soil, grown on 2.5, 5.0, 7.5 and 10% oil-treated soils were, respectively, 37 ± 0.4, 21.84 ± 0.27, 12.78 ± 0.11 and 14.74 ± 0.03% lower than non-rhizosphere soil. Comparison of PAHs content of rhizospheric and non-rhizospheric soil also indicated that the highest rate of PAH removal was for acenaphthene (74.63 ± 0.78) in control, fluoranthene (71.18 ± 0.56) in 2.5%, and anthracene (69.45 ± 6.33, 55.66 ± 4.38 and 35.97 ± 0.22) in 5.0, 7.5 and 10% oil-contaminated soil and acenaphthene (74.63 ± 0.78) in control. Activities of peroxidase, ascorbate peroxidase, and polyphenol oxidase were more prominent in the roots of plants exposed to increasing concentrations of oil in soil than control plants. Conversely, the activity of superoxide dismutase decreased. These findings render A. marina as a phytoremediation candidate for small scale oil spills and residual oil pollution in coastal marine environments.

Organic & Biomolecular Chemistry

Using DABSO as a substrate, different simple to complex structures can be constructed, such as su... more Using DABSO as a substrate, different simple to complex structures can be constructed, such as sulfonyl fluorides, sulfonamides, sulfonohydrazides, sulfonic esters, and sulfones. In this review, we investigate the role of DABSO in organic synthesis.

Journal of Oceanography, 2019

Polycyclic aromatic hydrocarbons (PAHs) are classified as an important category of semi-volatile ... more Polycyclic aromatic hydrocarbons (PAHs) are classified as an important category of semi-volatile and persistent organic pollutants. They cause environmental problems due to their toxicity and accumulation in sediments. In this research, offshore sediments of 19 stations in 8 transects of the Persian Gulf in Bushehr province were studied to assess the sources of PAHs. The extraction and clean up method were based on pressurized liquid extraction (PLE) with the cleanup by packed silica gel-based column. The compounds were analyzed by GC-MS. Recovery of the compounds was over 70%. The range of total 15 PAHs in sediment was from 6.5 to 35.5 ng g-1 sediment dry weight. The results showed that the levels of PAHs in the sediments were in the category of low pollution sediments. The highest concentrations of PAHs have been recorded in the station number 4 and 15 near the Kharg Island (Abouzar oil field) and Golshan oilfield, respectively. The cross plots of the diagnostic ratios of PAHs have come into common use as a tool for identifying and assessing pollution emission sources. Three cross-plots for the diagnostic ratios were applied in this study. They showed that the PAHs in the area had mixed sources of pyrogenic and pyrolytic. A progressive increase in the levels of PAHs was observed compared to the ROPME Cruise in 2006 that reflected more impact of anthropogenic activities on the sediments in recent years.

Biotechnology Reports, 2020

Mangrove plants, which inhabit and form sensitive ecosystems in the intertidal zones of tropical ... more Mangrove plants, which inhabit and form sensitive ecosystems in the intertidal zones of tropical and subtropical coastlines, though vulnerable to petroleum pollution, still maintain their growth under oil contamination. To elucidate the molecular response of mangrove plants to crude oil-sediment mixture, seeds of Avicennia marina were planted and grown on 0, 2.5, 5.0, 7.5 and10 % (w/w) oil-contaminated soil. Plant biomass was highly affected from 3.05 AE 0.28 (Control) to 0.50 AE .07 (10 %) and from 3.47 AE 0.12 to 1.88 AE 0.08 in 2 and 4 months old plants respectively. The expression analysis of 11genes belonging to detoxification pathways in the roots and leaves of 2 and 4 month-old plants was evaluated by qRT-PCR. Our results showed changes in expression levels of Fe-SOD, Mn-SOD, CAT, PRX, PPOs, GSTs, and NAP2 whose products are involved in reactive oxygen species (ROS) and xenobiotic detoxification. PPOA showed the highest expression induction of 43 AE 1.15, followed by CAT (12.61 AE 3.25) and PPOB (6.38 AE 1.34) in leaves of 2 months old seedlings grown on 7.5, 10 and 7.5 % oil contaminated soil respectively. PPOA (39.23 AE 2.1), PRX (32.13 AE 1.2) as well as PPOB (26.11 AE 1.3) showed the highest expression induction in leaves of 4 months old plants grown in 2.5 % oil contaminated soil. Our data indicated that PPOA can be a good biomarker candidate gene for long term exposure to oil contamination in A. marina.

Total organic carbon (TOC) is a chemical parameter which is of great importance in the environmen... more Total organic carbon (TOC) is a chemical parameter which is of great importance in the environmental studies and industries such as pharmaceutical and semiconductor industries. Measurement of TOC provides a rapid method for expressing the organic carbonic content of a sample by converting it to carbon dioxide and measurement of the produced CO2. This is a non-specific method, because it is unable to distinguish the different organic species which are present in the sample and is merely a representation of the total carbon present in the sample. Due to the importance of TOC, it is essential to use an analyzer capable of this measurement with high accuracy in a short time and cost effective. There are different method for converting of organic carbons to carbon dioxides in which catalytic oxidation in high temperatures and photo-catalytic oxidation are two of the most common used methods. The SGEANATOCTM SERIES II utilizes the oxidation of organic compounds in the presence of titanium...

Journal of Aquatic Ecology, 2018

عون :هلاقم یشهوژپ هدیکچ متسیسوکا یاه لحاوس رد نتفرگ رارق لیلد هب ناریا ورگنام جیلخ سراف زا یکی هک... more عون :هلاقم یشهوژپ هدیکچ متسیسوکا یاه لحاوس رد نتفرگ رارق لیلد هب ناریا ورگنام جیلخ سراف زا یکی هک هارهاش یاه مهم لمح لقنو عاونا ضرعم رد ،تسا یتفن داوم هدنیلاآ یاه .دنراد رارق یتفن هب روظنم یگدولآ تارثا یسررب ( ارح هایگ کیژولویزیفوفروم تافص یخرب یور یتفن Avicennia marina ) بلاق رد یشیامزآ ، حرط یاه ًلاماک اب یفداصت 3 ارجا رارکت دش . یز هدوت هزیگنر رادقم و لیفورلک( یاه a و b میزینم ،نیریفروپوتورپ ، هایگ گرب )لک دیئونتوراک و دیلیفورلکوتورپ ،نیریفروپوتورپ ، زا سپ هام راهچ هناوج ینز هتشاک یاهرذب هب هدولآ کاخ رد هدش غ تظل یاه فلتخم ( 5 / 2 ، 5 ، 5 / 7 و 01 و یسررب دروم تفن )ینزو دصرد هزادنا یریگ ،یتفن یگدولآ هک داد ناشن جیاتن .تفرگ رارق یز هدوت هزیگنر رادقم و هایگ یاه هب هژیو لیفورلک

Regional Studies in Marine Science, 2020

Abstract The present study aims to test the applicability of the macrobenthos indexes (AMBI, M-AM... more Abstract The present study aims to test the applicability of the macrobenthos indexes (AMBI, M-AMBI, BENTIX, BOPA; Shannon (H ′ );average taxonomic distinctness ( Δ +),variation in taxonomic distinctness ( Λ +) and total taxonomic distinctness (s Δ +) to assess the EcoQs of Chabahar Bay. Sampling was performed in the pre-monsoon period of 2017 from 19 stations. Five sediment texture/pollutant variables include grain size, total organic matter (TOM), PAH, heavy metal Pollution Load Index (PLI) and depth were also measured. Distribution pattern of macrobenthos as well as inter/intra relationship of the biotic and abiotic variables was investigated through multivariate statistical approaches. The Pearson and Rosenberg model was used to determine critical limit of TOC to reduce species richness, and as a criterion to select under-stressed stations. PCA analysis of all of indexes was used to evaluate the EcoQs of the polluted, suspected polluted or healthy stations. DistLM analysis showed that the sediment grain size followed by depth and TOM are main variables that significantly determine the distribution pattern of macrobenthos. Sensitive/tolerant indexes showed 84% full agreement as “acceptable” on most stations (including low-high TOC), while H ′ values assessed all stations as “unacceptable”. The funnel plot of Λ + could identify disturbed (high TOC) muddy stations, but was not a strong indicator of TOC disturbance for non-muddy stations. Among all indexes used in this study only the Λ + showed significant correlation with PAH, TOM and sediment grain size. We believe that the Λ + index works well in muddy substrates if the stress type is TOM overloading or PAH pollution. However this index alone does not make good judgment on the EcoQs of the studied area, so we recommend multimetric use of different indexes. As our results showed the physicochemical composition of sediment plays a key role in the distribution of macrobenthos and subsequently EcoQs assessment of Chabahar Bay, therefore, any anthropogenic activity affecting sediment could cause dramatic changes in macrobenthos assemblages.

Marine Pollution Bulletin, 2020

This research characterizes the temporal and spatial variability of the seawater carbonate chemis... more This research characterizes the temporal and spatial variability of the seawater carbonate chemistry on the near-shore waters of the northern Persian Gulf and Makran Sea. In general, normalized total alkalinity (nAT) showed a westward decrease along the coasts of Makran Sea and the Persian Gulf. Intertidal seawater was always supersaturated in terms of calcium carbonate minerals during the daytime. Rocky shore waters in the Persian Gulf were sinks for CO2 in the winter during the daytime. The nAT decreased from Larak to Khargu Island by 81 μmol/kg. As expected, the two hypothetical drivers of bio-calcification, i.e., Ω and the [HCO3-]/[H+] ratio, were significantly related at a narrow range of ambient temperature. However, as data were pooled over seasons and study sites, in contrast to ΩAr, the [HCO3-]/[H+] ratio showed a slight dependence on temperature, suggesting that the ratio should be investigated as a more reliable factor in future biocalcification researches.

$Research paper thumbnail of The effect of sub-lethal concentrations of water soluble fraction of crude oil on the chemosensory function of caspian roach, Rutilus caspicus (Yakovlev, 1870)$

Environmental toxicology and chemistry / SETAC, Jan 22, 2015

The water-soluble fraction (WSF) of crude oil is a complex and toxic mixture of hydrocarbons. Sin... more The water-soluble fraction (WSF) of crude oil is a complex and toxic mixture of hydrocarbons. Since aquatic organisms directly encounter it, WSF plays an important role in the toxicity of crude oil in aquatic environments. To determine whether fish are attracted to or avoid WSF, Caspian roach (Rutilus caspicus) were exposed to different concentrations of WSF in a choice maze apparatus. The results of this experiment showed that Caspian roach can detect and avoid 2 mg/L of WSF. In order to study the effect of WSF on the olfactory function of fish, Caspian roach were exposed to 3.2 and 16 mg/L of WSF for 96 h; afterward, exposed fish encountered food extract in a choice maze apparatus. This experiment showed that WSF significantly impairs the olfactory function of roach. To investigate the effect of olfactory system dysfunction on the feeding behaviour of fish, Caspian roach were exposed to 3.2 and 16 mg/L of WSF. After 4, 8, and 12 d of exposure, feeding behaviour toward the food ext...

Journal of Applied Phycology, 2015

Extracts of four heterocystous cyanobacteria isolated from wheat field soils (Triticum aestivum L... more Extracts of four heterocystous cyanobacteria isolated from wheat field soils (Triticum aestivum L.) were used as a promoter of growth and essential oil production in Mentha piperita L., which is mostly used for medicinal purposes. An axenic monoalgal culture was prepared using nitrate-free BG-11 medium. Pot experiments were performed by spraying algal extracts on the soil of treated plants on the first day of planting and every 20 days thereafter. Growth of plants was evaluated by measuring growth parameters such as plant height, root length, dry and fresh weight of plant, as well as leaf number, leaf area, and ramification after 100 days planting. In addition to growth factors, the quantity of essential oil of plants was also assessed. Statistical analysis showed that there were significant differences in the studied parameters compared to the control. The addition of some cyanobacterial inocula had a positive effect on the plant growth parameters and essential oil content. HPLC analysis of the cyanobacterial extracts detected some auxins, which may be the possible factor contributing to the positive growth responses and enhanced essential oil content of the treated plants.

Soil Science and Plant Nutrition, 2013

In present study, Anabaena isolates were collected from paddy field soils of seven main rice cult... more In present study, Anabaena isolates were collected from paddy field soils of seven main rice cultivation provinces situated in north, centre, south, west and east of Iran during 2 years from April 2008 to May 2010. Identification of taxa was carried out based on morphometric and molecular methods. Twenty one morphological characters and numerical taxonomic methods were used for classifying the several species of this genus. Numerical taxonomic studies were performed on 34 populations of 13 Anabaena morphospecies. A cluster analysis and principal component analysis performed using SPSS software and rate of resemblance among the species recognized. In the other section of this study phylogenetic relationships were determined by constructing 16S rRNA gene tree using the neighbor-joining algorithm. The results showed that populations of each species were placed close to each other and separate from the other species base on morphological characters. According to factor analysis, colonies form, filament structure, apoheterocytic or paraheterocytic form of filaments, position, shape and number of akinetes in filament, presence or absence of gelatinous sheath were the most variable characters which have been used for identification. Phylogenetic analysis based on 16S rRNA gene sequences also indicated that this gene site cannot separate genera such as Anabaena, Trichormus and Wollea which are morphologicaly close to each other.

Monatshefte für Chemie/Chemical Monthly, 2000

... Saeed Balalaie1YÃ, Armin Arabanian1, and Mehri S. Hashtroudi2 1 Department of Chemistry,KN To... more ... Saeed Balalaie1YÃ, Armin Arabanian1, and Mehri S. Hashtroudi2 1 Department of Chemistry,KN Toosi University of Technology, Tehran, Iran 2 Energy and Environment Department, Material and Energy Research Center, Tehran, Iran Summary. ...

Monatshefte f�r Chemie / Chemical Monthly, 2003

Three component condensation of alkylacetoacetates, primary amines, and alkyl cyanoacetates catal... more Three component condensation of alkylacetoacetates, primary amines, and alkyl cyanoacetates catalyzed by solid supports under microwave irradiation gave N-alkyl 3-cyano-6-hydroxy-2(1H)-pyridinones with high yields. Upon carrying out the reaction under the same condition on acidic alumina, zeolite HY, silica gel, and montmorillonite K-10, the best yields were achieved by silica gel.

Journal of Applied Phycology, 2012

Three isolates of heterocystous cyanobacteria, belonging to the genera Anabaena and Nostoc, gathe... more Three isolates of heterocystous cyanobacteria, belonging to the genera Anabaena and Nostoc, gathered from Iranian terrestrial and aquatic ecosystems exhibited considerable growth promotion effect on several vegetables and herbaceous plants. To study the ability of these three isolates to produce auxins, three endogenous auxins, including indole-3-acetic acid (IAA), and two of its main homologues, indole-3-propionic acid and indole-3-butyric acid, were extracted and analyzed with high-performance liquid chromatography equipped with diode array detector and fluorescence detector, and the results were further confirmed with liquid chromatography-tandem mass spectrometry (LC-MS/MS) in the negative-ion mode. The dominant auxin observed in all isolates was indole-3-butyric acid (IBA) in the range of 140.10-2146.96 ng g −1 fresh weight (FW), and only small amounts of IAA (2.19-9.93 ng g −1 FW) were detected. The predominance of IBA in these strains is reported for the first time which is different from the previously reported auxin profiles in microalgae and algae with the predominance of IAA.

Heterocyclic Communications, 2009

One-pot three component condensation of Meldrum's acid, benzaldehyde derivatives and guanidinium ... more One-pot three component condensation of Meldrum's acid, benzaldehyde derivatives and guanidinium carbonate leads to 2-amino-6-aryl-5,6-dihydro-3//-pyrimidin-4-one derivatives in good yields. The products can be utilized in the synthesis of diverse heterocyclic compounds libraries.

Helvetica Chimica Acta, 2011

Dedicated to Prof. Hooshang Pirelahi on the occasion of his 70th birthday The four-component reac... more Dedicated to Prof. Hooshang Pirelahi on the occasion of his 70th birthday The four-component reaction of dimethyl acetylenedicarboxylate (¼ dimethyl but-2-ynedioate; DMAD), aromatic aldehydes, and malononitrile (¼ propanedinitrile) leads to polyfunctionalized 1,4dihydropyridine derivatives. The reaction proceeds at room temperature and in the presence of a catalytic amount (20%) of (NH 4) 2 HPO 4 as a base in aqueous media.

Green Chemistry, 2000

Oxidation of benzoins are efficiently performed with zeolite A without any oxidizing agent under ... more Oxidation of benzoins are efficiently performed with zeolite A without any oxidizing agent under solvent-free conditions and microwave irradiation; the method is clean, fast, facile, efficient, low-cost and environmentally benign and operates selectively only on benzoins.