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  • Articles  (7,429)
  • General Chemistry  (4,634)
  • Iran  (2,795)
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  • Articles  (7,429)
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  • 11
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    Optimization of growth, lipid and chlorophyll contents in Chlorella vulgaris under different conditions of nitrate, phosphate and photoperiod by central composite design (CCD) (2021)
    In:  http://aquaticcommons.org/id/eprint/25987 | 18721 | 2018-10-19 17:27:54 | 25987 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: The effects of nitrate (750-2250 mg/L), phosphate (20-60 mg/L) and photoperiod (8-24 h) on the growth, chlorophyll content and lipid yield of Chlorella vulgaris were studied using central composite design (CCD) method. The second-order quadratic model was used to predict the effects of input variables on the output responses and the results were verified by F test, ANOVA and regression analyses. Results showed that maximum growth (255.88 ×106 ) as well as highest chlorophyll content (15.34%) were observed at 16 h of light, 1500 mg/L of nitrate and 40 mg/L of phosphate concentration. Also, condition of 24 h of light, 750 mg/L nitrate and 20 mg/L phosphate concentrations resulted in maximum percent of lipid content (17.74%). The optimization of culture condition for simultaneous achievement of highest levels of growth, chlorophyll and lipid content were investigated.
    Keywords: Aquaculture ; Iran ; Environmental and nutritional conditions ; Chlorella vulgaris ; Biochemical components ; Optimization ; Growth ; Lipid ; Chlorophyll ; Phosphate ; Photoperiod ; CCD
    Repository Name: AquaDocs
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  • 12
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    Evaluation of dietary supplements of Pediococcus acidilactici bacteria and Agaricus bisporus mushroom powder on skin mucus immune indices of common carp (Cyprinus carpio) exposed to silver nano-particles (2021)
    In:  http://aquaticcommons.org/id/eprint/25988 | 18721 | 2018-10-19 18:05:47 | 25988 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: The purpose of this study was to investigate the effects of dietary supplements of Pediococcus acidilactici bacteria and Agaricus bisporus mushroom powder separate and combined (combined supplement) on the skin mucosal immune indices of common carp (Cyprinus carpio) in exposure to silver nano-particles. For this purpose, 180 fish with mean weight 29.6±0.4 g were fed in four treatments: bacteria (1 g/kg of diet), mushroom powder (10 g/kg of diet), combined bacteria and mushroom powder (1 and 10 g/kg of bacteria and mushroom) supplements and control (nutritionally non-supplemented) treatments and each treatment with 3 replicate (15 fish per replicate) for 60 days. After the end of the feeding period, the fish were exposed to sub-acute concentration of nano-silver (1 mg/l) for 14 days. Sampling of skin mucosa was performed to evaluate the immune-related parameters on days 1, 7 and 14 (5 sampling per replicate). Results showed that activity of lysozyme, alkaline phosphatase enzymes, soluble protein and total immunoglobulin in diets containing dietary supplements had a significant difference in nano exposed groups with control treatments (p〈0.05) and had the highest amount on day 14. Also, although the control treatment had a 14-days incremental trend, it had the lowest levels than dietary supplement treatments. Combined food supplements, bacteria and mushroom powder showed the highest effects on mucosal immune parameters in exposure to nano-silver respectively.
    Keywords: Aquaculture ; Health ; Iran ; Immune system ; Dietary supplements ; Lysozyme ; Alkaline phosphatase ; Soluble protei ; Immunoglobulin ; Pediococcus acidilactici ; Bacteria ; Agaricus bisporus ; Common carp ; Cyprinus carpio ; Silver ; Evaluation ; Diet
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  • 13
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    Identification of vitellogenin gene expression patterns in liver and ovary of Rutilus frisii kutum exposed to genistein and β-sitosterol (2021)
    In:  http://aquaticcommons.org/id/eprint/25992 | 18721 | 2018-10-19 17:32:24 | 25992 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: The vitellogenin gene expression can be altered by some estrogenic plant compounds like Genistein and β-sitosterol. Therefore, the measurement of vitellogenin gene expression can be used as an indicator to determine their effect on reproductive performance of aquatic animals. In order to evaluate the effects of genistein and β-sitosterol on the expression of vitellogenin gene in the liver and ovary of Rutilus frisii Kutum, the fish were separately exposed to 3 levels of genistein and beta-sitosterol (500, 50 and 10 ng/L). After 21 days, the RNA extracted and expression of vitellogenin gene in both the liver and ovary was investigated by Real-time PCR. The results showed the level of vitellogenin gene expression in fish exposed to genistein was higher in liver than control and β-sitosterol treatment. This difference was not observed in the ovarian tissue. Because the main site of vitellogenin synthesis expressed liver and it was controlled by endogenous estrogen (E2), so, it seems phytoesterogenic compound such as genistein has been able to increase the relative expression of this gene in fish Exposed to 500 mg/L.
    Keywords: Aquaculture ; Biology ; Iran ; Genistein ; β-sitosterol ; Vitellogenin ; Gene expression ; Rutilus frisii Kutum ; Identification ; Ovary ; Liver ; Gene ; RNA ; PCR ; Fish
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  • 14
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    Effects of endocrine disruption by 4-nonylphenol ethoxylate on the growth performance and immune response of female and male immature koi carp (Cyprinus carpio carpio) (2021)
    In:  http://aquaticcommons.org/id/eprint/26001 | 18721 | 2018-10-19 18:22:44 | 26001 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: Nonylphenol (NP) is an endocrine disrupting chemical which has been shown to be able tomodulate endocrine system of various organisms by different mechanisms. The objective of this study was to investigate the potential effects of 4-NP and 17-β - estradiol (E2) on the immune parameters (IgM levels and lysozyme activity) of the teleost Koi carp (Cyprinus carpio carpio) for a better understanding of the immunereproductive system interactions. The experimental fishes were injected with ascending doses (10, 50,100 μgg^-1 body weight) of 4- nonylphenol (4-NP) and (2 μgg^-1 body mass) of 17-β-estradiol (E2) or vehicle during 3 weeks. After 21 days, the fishes (180) were anesthetizedand their blood samples were collected from caudal vein, and then they were dissected and sexually separated by gonad characters. The measurement of immune parameters in plasma showed that 4-NP induced significant increase in the IgM levels and lysozyme activity at dose of 50 μgg^-1 while the levels of these parameters in the higher doses (100 μgg^-1) decreased compared with the control group (p〈0.05). In addition the treatment, with 2 μgg^-1 E2 significantly decreased both the IgM levels and lysozyme activity after 21 days of injection. These results indicated that 4-NP and E2 could lead to disturb the balance of immune system with potential consequences for immature koi carp.
    Keywords: Biology ; Pollution ; Iran ; 4-nonylphenol ; 17-β-estradiol ; Immune-reproductivesystem ; Immunoglobulin IgM ; Lysozyme ; Koi carp ; Cyprinus carpio carpio ; Disruption ; Growth performance ; Female ; Male
    Repository Name: AquaDocs
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  • 15
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    Synthesis and characterization of aluminum oxide nanoparticles using macroalgae Sargassum ilicifolium (2021)
    In:  http://aquaticcommons.org/id/eprint/26088 | 18721 | 2018-11-12 18:25:53 | 26088 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: Nanoparticle biosynthesis is considered an important part of nanotechnology which is economically viable; it is an environmentally-friendly procedure with great advantages compared to physical and chemical ones. In the present study, a green approach is presented for the first time for producing alpha aluminum oxide nanoparticles using Sargassum ilicifolium algae in which its methanolic algae extract was employed as a reducing agent and stabilizer layer. Under optimal conditions of 25ºC and pH=4, 10% of algae extract concentration and 0.05M Al2 (SO4)3 salt, aluminum cations were reduced completely to nanoscale phase within 24 hours. XRD technique confirms the formation of alpha aluminum oxide size 35 nanometers in a hexagon shape. The results of TEM confirms the spherical almost shape of the produced nanoparticle, the results of SEM shows the average size 33.40 of the nanoparticle, and the results of EDX indicated the purity of the produced nanoparticle which is formed of only oxygen and aluminum atoms.
    Keywords: Biology ; Iran ; Characterization ; Aluminum Oxide ; Nanoparticles ; Macroalgae ; Ilicifolium ; Sargassum Ilicifolium ; Algae extract ; Algae
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  • 16
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    Study of taxonomy and ecology of Planktonic Copepods of Poecilostomatida in Bahrakan waters (Northwestern Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/26089 | 18721 | 2018-11-16 09:01:55 | 26089 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: The present investigation is based on separation and identification of Planktonic Poecilostomatoida in Bahrakan waters during July, August, October of 2010 and December, February, April of 2011. In this study The order of Poecilostomatida was represented by 3 species, Corycaeus andrewsi and Sapphirina nigromaculata andSaphirella- like copepodid. Abundance of each species was measured in sampling months. The highest density of Poecilostomatoid copepods were recorded in August and October 2010. C. andrewsiwith relative frequency of 73% was dominant species during the studying period among Poecilostomatoida and maximum abundance of it were observed in October 2010. Saphirella- like copepodid was observed in all sampling months. Maximum abundance of this species was in August and October 2010 and this report is the first report of this species in the Persian Gulf. There was Positive significant correlation coefficient between density of C. andrewsi and water salinity (P〈0.05) but there was no significant correlation between the rest species and water parameters.
    Keywords: Aquaculture ; Biology ; Iran ; Taxonomy ; Ecology ; Bahrakan waters ; Copepods ; Planktonic ; Poecilostomatida ; Corycaeus andrewsi ; Sapphirina nigromaculata
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  • 17
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    Effect of microbial transglutaminase on gelling properties of kiddi shrimp (Parapenaeopsis stylifera) mince (2021)
    In:  http://aquaticcommons.org/id/eprint/26095 | 18721 | 2018-11-17 18:35:14 | 26095 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: The properties of kiddi shrimp (Parapenaeopsis stylifera) gel added with different levels of microbial transglutaminase (MTGase) (0.6, 1, 1.4 and 1.8 units/g) were studied. Most textural parameters of the gels improved by adding MTGase espacially at higher levels (1.8 and 1.4).The expressible moisture and trichloroacetic acid content declined with the increase in MTGase content. MTGase espacially at higher levels was effective in the color of the gels so that it increased L* and decreased a*andb* value. SDS-PAGE study revealed that myosin heavy chain underwent polymerization to a higher extent in the presence of MTGase. Microstructure of gels added with 1.8 units of MTGase had more ordered fibrillar structure compared with those of gels without MTGase. Therefore it could be concluded that at MTGase play an important role in improving the gel properties of kiddi shrimp mince.
    Keywords: Agriculture ; Iran ; Microbial transglutaminase ; Gel ; Kiddi shrimp ; Mince
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  • 18
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    Evaluation of tidal bores effects of Persian Gulf on the stage-discharge curve of the Karun River (2021)
    In:  http://aquaticcommons.org/id/eprint/26096 | 18721 | 2018-11-17 18:36:49 | 26096 | Khorramshahr University of Marine Science and Technology
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    Publication Date: 2021-07-24
    Description: The rivers that pour to seas and oceans are known as tidal rivers. A governing factor on tidal rivers is tidal bores which are produced by the gravity of moon and sun. Reflection of waves from beaches and the shape of beaches and effects of shallow water, effect on tidal bores in the mouth of tidal rivers. These factors convert tidal bores from time periodic condition to no periodic condition. Tidal bores move to upstream of river while fluvial flows go toward downstream of river. Because of combination of Tidal bores and fluvial flows, hydraulic and hydrologic conditions are very complex in the tidal rivers. Measurement of velocity and discharge of current is impossible in the tidal limit of tidal rivers. For determination of stage-discharge curves, an especial method is needed. In this research, water surface elevation is estimated by using discharge of fluvial flow in Ahvaz and tidal height in Khoramshar in tidal limit of the Karun River (from Khoramshar to Darkhovein). Water surface elevation is shown by structural curves and regression relations. These curves and relations are suitable tools for determination of water surface elevation in the tidal limit of the Karun River by using discharge of fluvial flow in Ahvaz and tidal height of Khoramshar.
    Keywords: Agriculture ; Tidal bores ; Fluvial flow ; Ahvaz ; Khoramshar ; Darkhovein ; Stage-discharge curve ; Iran
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  • 19
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    Investigation of effect weight of parameters affecting the hydrodynamic coefficients in design of surface-piercing propellers (2021)
    In:  http://aquaticcommons.org/id/eprint/26087 | 18721 | 2018-11-12 18:23:48 | 26087 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: High speed craft with the wide and various uses of entertainment, sporting, commercial and military, usually has a top speed of 30 knots. Due to the limitations of the design, use of propulsion system is a key issue, with regard to the desirable features surface-piercing propeller, their use in the propulsion system of the vessel, has been very useful. High efficiency, no restrictions to increase the diameter, resistance equipment supplied propeller removed, the proper functioning of cavitation, are examples of these features. To achieve the best efficiency and thrust requirements requires accurate determination of the coefficient of hydrodynamic thrust and torque. Given the importance of determining the coefficients and their dependence on various physical parameters and geometric, it is necessary to understand the effect of these parameters on the hydrodynamic coefficients, so in this study, experimental tests and collect data using sensitivity analysis, the weight of each parameter and the interaction of parameters surface-piercing propeller to evaluate the hydrodynamic coefficients on the propeller thrust, propeller torque, and therefore performance, is desired. Based on the results obtained, the parameters of step angle, skew and compared to other parameters, have the greatest impact in changing the propeller efficiency, while changing the ratio Immersion, the change will have little impact on efficiency and propeller
    Keywords: Ecology ; Iran ; Investigation ; Weight ; Parameters ; Hydrodynamic ; Surface ; Area ; Surface-piercing propellers ; Propeller experimental testing ; Hydrodynamic coefficients ; Weight effect ; Design of propeller ; Speed
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  • 20
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    Detection coastal thermal fronts in the Persian Gulf and the Oman Sea using MODIS images (2021)
    In:  http://aquaticcommons.org/id/eprint/26086 | 18721 | 2018-11-12 18:22:33 | 26086 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: Temperature fronts are important in marine studies. Sea fronts are sharp boundaries between different water masses. For this study different time series of MODIS level-3 thermal IR SST data from 2013-2014 has been processed and thermal fronts the of Persian Gulf and the Oman Sea (47.6°E to 67.7°E and 18°N to 31°N) region mapped using the method, the Canny algorithm and Gaussian filter. Monthly thermal front images of this region are mapped during the period of January 2013 to June 2014 are classified into Summer Monsoon (June, July, August, September), Winter Monsoon (October, November, December, January) and Pre Monsoon (February, March, April, May) periods and their characteristics are discussed here. The results show that high frequency of SST fronts was observed in the Oman Sea and Persian Gulf in October, November, December, January and May in 2013 year and January, November and December in 2014 year. The number of fronts increases since the beginning of winter to early spring and the beginning of fall, too. The remaining these fronts move with current toward the Arabian Sea and Indian Ocean at the beginning of the summer monsoon. Sustainable and cohesive front was seen near the Arvand River in the Persian Gulf that is presents in the cold months more. This front will disappear in the months of July, August and April 2013 and 2014. The other stable front is in the Oman Sea in southern Pakistan. Most of the front are presenting in the warmer months of June, September, October in 2013 and in June, August and October in 2014.
    Keywords: Ecology ; Detection ; MODIS ; Temperature ; Canny algorithm ; MODIS satellite ; Thermal fronts ; SST ; Persian Gulf ; Oman Sea ; Iran
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