khadijeh nemati
Abstract
Polycyclic aromatic compounds in the marine environment are often chemically stable and resistant to the toxic effects of these compounds can be carcinogenic properties and genetic changes noted. The study of Microalgae Tetraselmis sp for the removal of aromatic compounds benzo[a]pyrene and chrysene ...
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Polycyclic aromatic compounds in the marine environment are often chemically stable and resistant to the toxic effects of these compounds can be carcinogenic properties and genetic changes noted. The study of Microalgae Tetraselmis sp for the removal of aromatic compounds benzo[a]pyrene and chrysene ring of the effluent was Bandar Imam Petrochemical . Cultivation of Microalgae in order to achieve the desired number , petrochemical wastewater samples were subjected Microalgae . The reduction in the concentration of aromatic compounds by Microalgae were measured by HPLC showed that the removal of the two compounds at a concentration of benzo[a]pyrene./5 mg L, 49/6% ± 1.8 and the concentration chrysene 5/55 mg L,33/23% ± 1.2 respectively have been . The results showed that species have the ability to reduce aromatic compounds and is also suitable for petrochemical wastewater.
علوم زیستی دریا
matin khaleghi; Ahmad Savari; Alireza Safahieh; Mohsen Hamidian pour; Sadroddin Ghaemmaghami
Abstract
This study was carried out in the Gowatr mangrove forests in Gulf of Oman, on September 2017 and May 2018 during high tide with the aim of quantifying production, biomass carbon stocks of Avicennia marina and introduce of PnET-CN model. The results was showed that the mean of aboveground biomass was ...
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This study was carried out in the Gowatr mangrove forests in Gulf of Oman, on September 2017 and May 2018 during high tide with the aim of quantifying production, biomass carbon stocks of Avicennia marina and introduce of PnET-CN model. The results was showed that the mean of aboveground biomass was 28.09 ± 4.52 and 28.51 ± 4.49 t/ha, moreover, the mean of aboveground carbon stock was 11.22 ± 1.83 and 11.34 ± 1.7 t/ha, and the mean of primary production was 219.251 and 238.171 gC/m2.mo in September 2017 and May 2018, respectively. The estimated of the production and biomass carbon stocks using PnET-CN model was showed that the mean of production was 289.051 and 291.487 gC/m2.mo and the mean of aboveground biomass carbon was 12.29 and 12.76 t/ha in September 2017 and May 2018, respectively. The PnET-CN model could predict the effects of simultaneous changes in several environmental variables on the interactions among several ecosystem processes and it could estimate the amount of tree carbon stock and primary production with proper validation. PnET-CN model shown ecosystem models extended our understanding of the forest carbon cycle spatially and temporally and generated additional information about carbon stocks and fluxes.
علوم زیستی دریا
Razieh Nasrolahzadeh; Alireza Safahieh; Hossein Zolgharnein; Issac Zamani; Kamal Ghanemi
Abstract
Bisphenol-A (BPA) is one of the most important endocrine disrupters that has arrived to the environment, because of this reason, it has been developed into a detrimental material for human beings and other organisams. There are several ways for degradation or removal of industrial pollutants, ...
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Bisphenol-A (BPA) is one of the most important endocrine disrupters that has arrived to the environment, because of this reason, it has been developed into a detrimental material for human beings and other organisams. There are several ways for degradation or removal of industrial pollutants, in which the bacterial communities plays a major role in the biodegradation of BPA in the environment.In this study, contaminated sediments were collected in Mousa Creek. The isolates were identified by biochemical tests and 16S rRNA gene sequence analysis. The isolated Bacteri was Pseudomonas putida. Growth and degradation ability of isolated baccteri was measured in 100, 200 and 300 ppm of BPA in 24-hour intervals for 6 days. Bacterial growth rate was detected with spectrophotometer at 600 nm. Efficiency of BPA degradation was performed by Liquid-liquid extraction method and measured by HPLC. This bacteri was able to grow at concentrations of 100, 200 and 300 ppm of BPA. So, the biodegradation results from mineral salt medium (MSM) indicated that Pseudomonas putida have the best degradation efficiency at the 200 ppm of the BPA. Biodegredation result by HPLC method show that the percentage of the degradation efficiency at the 200 ppm was 82.8 percent.These results demonstrated this indigenous bacteria (Pseudomonas putida) can be used to improve the bacterial communities contaminated by Bisphenol A and to eliminate the pollutants from the costal environment.
علوم زیستی دریا
alireza safahieh; yaqub jaddi; abdol ali movahedinia; ali hallajian; sohrab dajandian
Abstract
The actue toxicity test was performed instatic renewal system based on the standared method Proposed by OECD during 96 h, in which physicochemical parameters of test water including pH, dissolved oxygen and Temprature were daily monitored. to determine the lethal range of diazinon of fish a range finding ...
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The actue toxicity test was performed instatic renewal system based on the standared method Proposed by OECD during 96 h, in which physicochemical parameters of test water including pH, dissolved oxygen and Temprature were daily monitored. to determine the lethal range of diazinon of fish a range finding test was carried out in aquariums coutaing 10 L of test solution. The acute toxicity test was then preformed in 5 treatment in triplicats. The obtained data were analyzed using probit analysis with %5 confidence limit. acording to the results, 24 h LC50, 48 h LC50, 72 h LC50 and 96 h LC50 of diazinon on common seabream was 10/974, 10/391, 9/134 and 7/316 respectively. The Maxium Acceptable Toxicant Concentration (MATC) of diazinon on common seabream was 0/073 mg/l and the Lowest observed effect concentration wich is equal to 96 h LC50 was 2.63 mg/l. The results indicated that compared to other fishes is more resistant against diazinon . in addition diazinon lethal toxicity takes place in a waide range of toxicant concentration.
fatemeh shahaliyan; Alireza Safahieh; Negin Salamat; Fatemeh Mojodi; Mostafa Zaredoost
Abstract
Due to their toxicities, oil pollutions and its derivatives such as anthracene are one of the most important issues of environmental researches all over the world. Oil hydrocarbons in contaminated soils, sediments and water can be degraded by microorganisms. Removal of hydrocarbons from aqueous solutions ...
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Due to their toxicities, oil pollutions and its derivatives such as anthracene are one of the most important issues of environmental researches all over the world. Oil hydrocarbons in contaminated soils, sediments and water can be degraded by microorganisms. Removal of hydrocarbons from aqueous solutions is also possible using cultured bacteria. In this study, the anthracene bioremediation by Bacillus pumilus isolated from oil sediments of Imam Khomeini port, was investigated. This bacterium made no clear halo on blood agar medium and couldn’t disperse the mineral oil but created a halo with a diameter of 0.5 cm on the surface of crude oil. As a result, the bacterium was detected as a non-producing biosurfactant species. The optical density of this species in the sample containing 30 mg/l of anthracene finally reached to 0.086. Measurement of anthracene degradation by HPLC showed that %40.833 of mentioned hydrocarbon was removed after 5 days. Therefore, the results indicate that the isolated bacterium can probably behave the same in the natural environment and could have the potential in bioremediation of this pollutant from environments.
bita archangi
Abstract
In this study, effects of BPA on erythrocytic nuclear abnormalities (ENA) stimulus (MN Test) and liver DNA integrity (DNA Unwinding Assay), in male yellowfin seabream (Acanthopagrus latus) were investigated. For this reason, fish received intraperitoneal injections during a period of 2 weeks with 10, ...
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In this study, effects of BPA on erythrocytic nuclear abnormalities (ENA) stimulus (MN Test) and liver DNA integrity (DNA Unwinding Assay), in male yellowfin seabream (Acanthopagrus latus) were investigated. For this reason, fish received intraperitoneal injections during a period of 2 weeks with 10, 50, 100 and 150 µg g-1 week-1 of BPA dissolved in coconut oil. Solvent controls received the coconut oil whereas controls were not injected. The fish were sampled on day 0, 7 and 14. In order to evaluate cytotoxicity of BPA presented in blood, the erythrocytic nuclear abnormalities (ENA) frequency in yellowfin seabrem was determined. Our results demonstrated a significant increase in fish micronuclei frequency after the treatment with bisphenol A in comparison to the control groups and in dose dependent manner. In addition, the rate of liver DNA integrity was tested using the DNA alkaline unwinding assay. Results showed a decrease in the rate of liver DNA integrity in treated fishes after 7 and 14 days of BPA exposure in comparison to the control group. In conclusion, results of the current project indicated that BPA has high genotoxic and/or cytogenotoxic potential. It could be concluded that Micronucleus test and DNA strand breaks can be used as sensitive cellular and molecular indicators of exposure to genotoxic BPA.
Abstract
The Study of Petrochemical Industries Sewage Effects on the Water Quality in Khor Musa Abstract Imam Khomeini petrochemical complex is situated at the northwest part of the Persian Gulf where discharged its sewage to the seawater.Samples were collected using Van Dorn sampler, bimonthly from four ...
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The Study of Petrochemical Industries Sewage Effects on the Water Quality in Khor Musa Abstract Imam Khomeini petrochemical complex is situated at the northwest part of the Persian Gulf where discharged its sewage to the seawater.Samples were collected using Van Dorn sampler, bimonthly from four sites during December 2009 to May 2010. The seawater physicochemical parameters such as DO, pH, BOD, total ammonia, total phosphorous and turbidity were measured and among them, BOD (5.05ppm), total ammonia (2.51ppm) and total phosphorous (0.3ppm) showed higher than standard values. Based on water quality scoring (WQS), all sites showed 2.66 values which classified as bad water quality. During this study, BOD, total ammonia and phosphorous showed significantly (p
shafa hoveizavi; hossein pasha zanusi
Abstract
Ecological health is the most important component of the biological health. Macrobenthos invertebrate are the most important organisms in aquatic ecosystems that are used for determination of biological health. Benthic indices base bye data simplifying and shows a set of biological variable as a quantified ...
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Ecological health is the most important component of the biological health. Macrobenthos invertebrate are the most important organisms in aquatic ecosystems that are used for determination of biological health. Benthic indices base bye data simplifying and shows a set of biological variable as a quantified variable that made the interpretation of data easier, one of this indices is BOPA index that give from ratio of opportunistic Polychaeta to Amphipoda. The higher value of this index shows environmental pollution. The value of BOPA index showed significant difference between stations(p
masoumeh darabpour dezdarani
Abstract
Abstract: mudflats of the most important coastal habitats of the Persian Gulf to go and base are essential primary production. Variety of animal species to determine the biological and ecological health of an ecosystem of water is important. Class of ostracoda component of hard skin is shelled. To study ...
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Abstract: mudflats of the most important coastal habitats of the Persian Gulf to go and base are essential primary production. Variety of animal species to determine the biological and ecological health of an ecosystem of water is important. Class of ostracoda component of hard skin is shelled. To study the diversity and distribution of this species in the area seven stations were selected Bahrakan tidal beach. Sampling of sediment cores by the core 8/5cm2 from 5 cm surface sediments were performed. Environmental factors such as salinity, temperature, dissolved oxygen and turbidity was measured. Total organic carbon and grain size of total deposits each station respectively. Biological sediments at each station with 10% formalin were fixed, 63 mm sieve, then washed and stained with Rose Bengal and the organisms isolated were tetrachloride carbon. The density of organisms in the winter and summer were 10495 and 3565 individuals in the 10cm2, respectively. Finally, 29 species were identified. Cytheridae family was abundant. The highest value of Shannon’s diversity and brilluin index, Margalef index, Hill and Pielou’s evenness calculated in winter. The highest total organic carbon in winter and summer was 9.59 and 4.61, respectively. Sediment grain size showed that the region made of silt – clay and the highest percent of silt_ clay was in summer.
mohadeseh miri
Abstract
This study examined the effects of brine discharge from desalination plant Chabahar-Konarak on the sea environment were used to study polychata assemblage. Sediment samples were sampled from 7 stations in pre monsoon and post monsoon in year 2011 using by van veen grab (0/025m2) samplers that 5 stations ...
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This study examined the effects of brine discharge from desalination plant Chabahar-Konarak on the sea environment were used to study polychata assemblage. Sediment samples were sampled from 7 stations in pre monsoon and post monsoon in year 2011 using by van veen grab (0/025m2) samplers that 5 stations were around the discharge point and 2 station as controls. The results of the statistical analysis showed that the abundance and richness significances differences (P<0/05) between stations.The most and the lowest abundance of polychaetes were occurred in station 6 with 3666.62 and 2079.92 individuals per m2 in pre and post monsoon and in station1 in pre and post monsoon periods with 306.97 and 0 numbers in m2.The richness, diversity and evenness results indicated that the highest and the lowest values is observed in control stations 0.94, 1.07 and 0/67 in pre monsoon and station 1, zero in post monsoon. According to results, we observed different sensitivity of polychaete to brine discharges because abundance and ecological indices were decreased in stations near the discharges area comparing to control stations far from the brine discharges zone. The most frequancy family in this study was spionidae that it showed tolerance of this family to brine discharges. With monsoon occurrence of stress added to the study area where that the lowest abundance (0) in one station in post monsoon.
m ch; a d; a s; k gh; a d
Volume 11, Issue 4 , March 2013, , Pages 46-56
علوم زیستی دریا
Masoomeh Mahmoodi; Alireza Safahieh; Yadollah Nikpour; Kamal Ghanemi
Volume 11, Issue 1 , November 2012, , Pages 58-67
Abstract
In order to study concentration of polycyclic aromatic hydrocarbons in seawater from Bushehr coast and for comparison with available guidelines samples of seawater were collected from five different stations along the Bushehr coast in August and February 2011. PAHs were extracted by Hexane solvent and ...
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In order to study concentration of polycyclic aromatic hydrocarbons in seawater from Bushehr coast and for comparison with available guidelines samples of seawater were collected from five different stations along the Bushehr coast in August and February 2011. PAHs were extracted by Hexane solvent and analyzed using HPLC system (Knauer). Results showed that tPAHs concentration in seawater were 31.0, 20.8, 4.0, 17.6 and 12.3 µg l-1, in August and 38.4, 23.0, 5.4, 19.3 and 17.2 µg l-1 in February respectively, at stations Rafael, Sheghab, Abshirinkon, Lian and Helyleh. The concentrations of tPAHs in the seawater were not significantly different during August and February (P>0.05). Significant difference was observed between tPAHs concentration between the stations (P<0.05). The tPAHs concentration was maximum in Rafael and its minimum was found in Abshirinkon., The tPAHs concentration in Bushehr area was relatively higher compared to other locations of the world. Even though concentrations of anthracene, phenanthrene, fluoranthene and pyrene were above the Canadian Environment Guidance, the carcinogenic compounds appeared in lower concentrations than the non-carcinogenic PAHs. Since Bushehr coastal waters is contaminated by PAHs, precise monitoring and control of oil discharge into the coastal waters as well as reduction of urban effluents input should be undertaken. Meanwhile the continuous monitoring of PAHs compounds in the area is recommended.
matin khaleghi
Volume 11, Issue 3 , November 2012, , Pages 81-90
Abstract
This research aimed to study the process of long and location changes of sea star(Astropecten hemprichi) and sea urchin(Diadema setosum) in the coast of Chabahar Gulf in the Oman Sea, IR. during November 2008 to September 2009. The area of study was at the farthest end of south east of Iran in province ...
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This research aimed to study the process of long and location changes of sea star(Astropecten hemprichi) and sea urchin(Diadema setosum) in the coast of Chabahar Gulf in the Oman Sea, IR. during November 2008 to September 2009. The area of study was at the farthest end of south east of Iran in province of Sistan and Balouchestan. Sampling was done bimonthly during low tide from 5 stations, using 1m×1m quadrating randomly. 1885 samples of Echinodermata were collected and studied. Results showed that 32 of them(1.6%) belong to A.hemprichi species and 28(1.4%) samples belong to D. setosum species. The samples then were counted and identified. Then the samples’ abundance, distribution and stability were investigated. The results show that the maximum abundance of A. hemprichi was occurred in September 2009 (1/92±0/76ind.m-2) and The maximum value for D. setosum was shown in November 2008 (3ind.m-2). Investigation of distribution and stability indicators may reveal that A. hemprichi and D. setosum were dispersed more randomly and they may be considered as the rare species .