Recursos de colección

Aquatic Commons (41.069 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Chemistry

Mostrando recursos 1 - 20 de 155

  1. Assessment of cadmium and lead in the water and trout fish (Salmo trutta) of Zayandehroud River, a case study of Zarinshahr rice farms, Isfahan

    Moradi, S.; Nowzari, H.; Farhadian, M.
    This study aimed to investigate the concentrations of two heavy metals, lead and cadmium, in the water of Zayandehroud River which is surrounded by Zarinshahr rice farms. Water was sampled from a depth of 30 cm during June, July and August 2015, i.e. during the process of planting, growing and after harvesting, in three stations. Water was collected from three points; 20m before the farms, beside the farms and 100m after the farms. Three water samples and one trout fish (Salmo trutta) sample were collected each month and the concentrations of lead and cadmium were measured in the kidney, liver...

  2. Combined effect of sodium polyphosphate and smoking on quality parameters of fish (Capoeta umbla) sausage

    Özpolat, E.; Guran, H.Ş.
    Improving food quality is one the major issues for the food processing industry. Since food produced from fish spoils quickly, it obviously cannot be kept for an extended time. The aim of the present study was to determine the effects of sodium polyphosphate and smoking on the shelf life of fish sausage that was produced from Capoeta umbla and stored at 4±1°C. Therefore, we designed four groups: control group (A), which used neither sodium polyphosphate nor smoking; and treatment groups that used only sodium polyphosphate (group B), smoking (group C) and a combination of sodium polyphosphate and smoking (group D)....

  3. Seasonal variations of ω3 polyunsaturated fatty acids in muscle of Capoeta caelestis

    Emre, N.; Uysal, K.; Emre, Y.; Yetek, İ.; Pak, F.
    In this study, seasonal variations of fatty acid amounts in muscle tissues of Capoeta caelestis were investigated. We have found that the ω3 contents of C. caelestis in spring, summer, autumn and winter were 17.43%, 15.29%, 17.54%, 13.63% in female and 16.96%, 19.25%, 18.66%, 14.76% in male, respectively. The amounts of ω3 polyunsaturated fatty acids were higher than those of ω6 polyunsaturated fatty acids. The eicosapentaenoic acid amounts were always higher than the docosahexaenoic acid amounts in C. caelestis. Female C. caelestis presented a higher amount of eicosapentaenoic acid and docosahexaenoic acid than males. The amounts of docosahexaenoic acid to...

  4. Short communication: The effect of black seed oil and olive oil on shelf life of dry-salted crucian carp (Carassius carassius Linneaus, 1758)

    Çağlak, E.; Karslı, B.
    Seafood important in the health of human beings, is qualified as sensitive nutrients that have a limited shelf life. Due to their sensitivities, varieties of preservation methods have been used from past to present. One of these methods is salting that has been used traditionally. The salting process is divided into 3 groups including dry salting, brine salting and mixed salting. With developing technology, the rate of salt is being decreased in salting process. In addition to this, different methods (chemical, herbal, etc.) are being used by the addition of several preservatives. One of these preservatives is olive oil which...

  5. Functional properties of fish protein hydrolysates from cuttlefish (Sepia pharaonis) muscle produced by two commercial enzymes

    Raftani Amiri, Z.; Safari, R.; Bakhshandeh, T.; Ahmadi vavsari, F.
    Fish protein hydrolysates were prepared from Cuttlefish (Sepia pharaonis) muscle using alcalase and protamex methods. By conducting the Cuttlefish protein hydrolysate using alcalase (CPHA), it showed higher degrees of hydrolysis, proximate composition, yield, emulsifying activity index (EAI), emulsion stability index (ESI), foaming activity index (FAI), solubility, water holding capacity (WHC) and Oil absorption capacity (OAC) than cuttlefish protein hydrolysate using protamex (CPHP) but the foaming stability index (FSI) and peptide chain length (PCL) were more in the second treatment. Amino acids profiles of the CPHs were higher in essential amino acids compared to the recommended pattern of requirement by FAO/WHO...

  6. Study on nursery growth performance of Pacific white shrimp (Litopenaeus vannamei Boone, 1931) under different feeding levels in zero water exchange system

    Khanjani, M.H.; Sajjadi, M.M.; Alizadeh, M.; Sourinejad, I.
    Effect of different feeding levels on water quality, growth performance, survival rate and body composition of Pacific white shrimp Litopenaeus vannamei post larvae were studied in zero water exchange system. Shrimp post larvae with mean weight of 74.46± 6.17 mg were fed for 32 days in 300L fiberglass tanks containing 130L water at density of 1 post larvae L^-1. There were five treatments including control and four biofloc treatments with different feeding levels of 15%, 15%, 12%, 9%, 0% of body weight per day, respectively. The results showed that there were no significant differences in water parameters such as dissolved...

  7. Lecithin effects on blood biochemical parameters and resistance to thermal stress in juvenile of Mesopotamichthys sharpeyi (Cyprinidae family)

    Seiedzadeh, S.M.; Yavari, V.; Mohammadiazarm, H.; Mousavi, M.
    In this study, the effects of dietary chicken egg lecithin on some blood biochemical factors of Mesopotamichthys sharpeyi juveniles and resistance to thermal shock was investigated. Juveniles with initial average weight of 3.10±0.17 were stocked in 12 fiberglass tanks. Four isolipidic and isonitrogenic diets containing 0% (control), 2%, 4% and 6% chicken egg lecithin were used to feed the fish 3 times per day to satiation during 90 days. Total protein, cholesterol, high density lipoprotein (HDL) and albumin levels were significantly higher (p<0.05) in juveniles fed 6% lecithin compared to the control diet. The triglyceride level was also significantly decreased...

  8. Antimicrobial and antioxidant effects of nisin Z and sodium benzoate in vacuum packed Caspian kutum (Rutilus frisii) fillet stored at 4°C

    Mirshekari, S.; Safari, R.; Adel, M.; Motalebi Moghanjoghi, A.A.; Khalili, E.; Bonyadian, M.
    This study was done to evaluate the antimicrobial and antioxidant effects of nisin Z (0.02 %) and sodium benzoate (1.5 and 2.5 %) in vacuum packed Caspian Kutum (Rutilus frisii) fillet stored at 4°C. Microbial changes [aerobic plate counts (APC), psychrotrophic counts (PTC) and lactic acid bacteria] and chemical indices [peroxide value and total volatile basic nitrogen (TVB-N)] were determined in days 0, 4, 8, 12 and 16. Results showed that PV and TVB-N in control samples (the sample dipped in prechilled distilled water) were deteriorated after 12 days compared to preserved samples which were acceptable after 16 days. Microbial...

  9. The effect of black glutinous rice bran (Oryza sativa L.) in diets of Nile tilapia (Oreochromis niloticus)

    Yuangsoi, B.; Rinthong, P.; Charoenwattanasak, S.
    The effect of black glutinous rice bran inclusion used in diets of Nile tilapia was studied in fish with an initial weight of 8.76±0.17g per fish and fed with experimental diets supplemented with black glutinous rice bran at 0 (control), 50, 100, 150 and 200 g kg^-1 for 60 days. The results of phytochemical analyses of black rice bran showed that the total anthocyanin, phenolic, tannin and phytic acid contents were 52.42±0.23, 3.77±0.03, 0.32±0.13, 0.14±0.01 mg/100g, respectively. The properties of black glutinous rice bran acted as an antioxidant, and the inhibitory percentage of 1,1-diphenyl-2-picrylhydrazyl (DPPH) and thiobarbituric acid reactive substances...

  10. A review on the role of inositol in aquaculture

    Shirmohammad, F.; Mehri, M.; Joezy-Shekalgorabi, S.
    Inositol is usually classified as an essential vitamin for most animals, and is recognised as a part of the B-complex vitamins. Among all other inositol isomer forms, myo-inositol possesses biological activity. It is found in the brain, skeletal, heart, and main reproductive tissues and exists as a structural component of phosphatidylinositol in biological cell membranes. Myo-inositol, also acts as a growth factor and affects the antioxidant capacity and oxidative status of cells. It is a major intracellular osmolyte that can be accumulated to protect cells from a variety of stresses and can also participate in transmembrane signal transfer. Myo-inositol is...

  11. Chitosan extracted from the Persian Gulf chiton shells: Induction of apoptosis in liver cancer cell line

    Rasti, H.; Parivar, K.; Baharara, J.; Iranshahi, M.; Namvar, F.
    Here for the first time, we investigated the cytotoxic effects of the chitosan extracted from the Persian Gulf Chiton shell (Acanthopleura vaillantii) on liver cancer cell line (HepG_2). Chitosan extraction was implemented following this method: chitin was produced by demineralization and deproteinization procedure, and the extracted chitin was converted into soluble chitosan using deacetylation method. The cytotoxic effects of extracted chitosan were evaluated using four different tests, including 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, Annexin V-FITC, propidium iodide (PI) staining, 4',6-diamidino-2-phenylindole (DAPI) staining, and Caspase activity analysis. The IC_50 inhibitory concentrations of chitosan were obtained at 250 µg/mL after 24 h. Chitosan...

  12. Fatty acid composition, chemical composition and processing yield of traditional hot smoked common carp (Cyprinus carpio, L)

    Ljubojević, D.; Radosavljević, V.; Pelić, M.; Đorđević, V.; Živkov-Baloš, M.; Ćirković, M.
    The main objective of this study was to describe the proper technological process of hot smoking of common carp as well as to determine the yield of the final product and also proximate and fatty acid composition of hot-smoked common carp meat. The average yield of smoked common carp was 82.19% based on weight of eviscerated and descaled fish or 47% based on weight of live fish. The smoking process reduced moisture content by 19% and increased protein by 35% and lipid by 28%. Increase of cholesterol level from 50 to 51.93% during the smoking process was not statistically significant....

  13. Effects of long-term frozen storage on the compositions of free amino acids and nucleotide-related compounds of the coconut crab Birgus latro

    Sato, T.; Ohgami, S.; Kaneniwa, M.
    This study examined the effects of long-term frozen storage (-20 °C for 5 months) of free amino acids (FAAs) and nucleotide-related compounds (NRCs) in muscle and hepatopancreas of the coconut crab Birgus latro. Although long-term frozen storage had little effect on FAA composition in muscle, the amounts of several FAAs increased in the hepatopancreas that may be the result of protein decomposition during the frozen storage. Long-term storage at -20°C significantly increased the amounts of disodium 5ʹ-inosine monophosphate (IMP) in muscle and hepatopancreas, resulting from the deaminase activity of 5ʹ-adenosine monophosphate (AMP) which deaminates AMP to IMP. Changes in FAAs...

  14. Distribution pattern of heavy metals in the surficial sediment of Gorgan Bay (South Caspian Sea, Iran)

    Ghorbanzadeh Zaferani, S.Gh.; Machinchian Moradi, A.; Mousavi Nadushan, R.; Sari, A.R.; Fatemi, S.M.R.
    The Gorgan Bay is an important ecosystem receiving discharge from their tributaries. In this study, concentration of Pb, Zn, Ni, Fe, Al, Cu and As was seasonally determined at 22 sampling points during 2012-2013. Sediment samples were collected using a Van Veen grab. The levels of heavy metals were determined by ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometry) and AAS (Atomic Absorption Spectrophotometer). The percentages of sand, silt, clay and TOM (Total Organic Matter) in the sediment samples were determined (44.4± 15, 53.4 ± 14, and 2.2± 2.2 and 7.2% ± 1.6, respectively). The results showed that range of Al,...

  15. Chemical composition and in vitro antimicrobial activity of some Iranian medical herbs against Yersinia ruckeri

    Adel, M.; Safari, R.; Ghitanchi, A.H.; Zorriehzahra, M.J.
    Increasing bacterial resistance to commercial antibiotics has led to considering medicinal herb applications. This study aimed to identify chemical composition of essential oil of some native medical herbs and their antibacterial activity against Yersinia ruckeri compared with Enrofloxacin in in vitro experiments. The antibacterial activities of ethanolic extracts and essential oils of Eryngium campestre, Pimpinella affinis, Mentha piperita, Achillea wilhelmsii and Cuminum cyminum were analyzed by disk diffusion, Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) methods in in vitro. Also, the oil constituents of the mentioned plants were analyzed by gas chromatography. The MIC value of the ethanolic...

  16. Haemato-immunological responses to diazinon chronic toxicity in Barbus sharpeyi

    Alishahi, M.; Mohammadi, A.; Mesbah, M.; Razi Jalali, M.
    The present research aimed to determine acute toxicity and evaluate the effect of sub-lethal concentrations of diazinon on some haematological and immunological parameters of Barbus sharpeyi by the Organization for Economic Cooperation and Development methods. Juvenile B. sharpeyi were exposed to 0, 5%, 10% and 25% 96h LC50 concentrations of diazinon for 21 days. Blood samples were taken after 7, 14 and 21 days of exposure to diazinon. Haematological and biochemical parameters including: RBC, Hb, PCV and WBC, as well as serum enzymes were evaluated. Immunological indices and resistance against bacterial infection, were determined. Results showed that 96h LC50 of...

  17. The effects of physicochemical parameters on fish distribution in Eğirdir Lake, Turkey

    Yağcı, A.; Apaydın Yağcı, M.; Bilgin, F.; Erbatur, İ.
    The present study was conducted based on the fish species and physicochemical parameters of Eğirdir Lake. Sampling was carried out monthly from January through December 2010 between 9 am and 11 am. The parameters measured were water temperature, depth, secchi disk depth, turbidity, dissolved oxygen, saturation of dissolved oxygen, pH, conductivity, chloride, hardness, calcium, magnesium, bicarbonate, carbonate, nitrate, nitrite, ammonium, sulphate, phosphate, silica, organic substance, acid power (SBV) and chlorophyll-a. Monthly sampling was performed at four stations at different depths. Water temperature ranged from 6.9±0.5 °C in February to 26.8±0.4 °C in August. Minimum secchi disk depth recorded was 0.5...

  18. Antioxidant activity in some Iranian seaweed species from Chabahar

    Taheri, A.
    The antioxidant activities of Ulva faciata, Nizimuddinia zanardinii and Gracilaria corticata were investigated in Chabahar, Iran. Methanol extract and n-hexane, dichloromethane and ethylacetate fractions used for antioxidative properties test by the total antioxidative activity, 2,2-diphenyl-1-picryl-hydrazylhydrate (DPPH) free radical scavenging activity, reduction power, metal chelating activity and inhibition of lipid peroxidation methods. The methanolic extracts of three seaweed species showed lower antioxidative properties. The most effective antioxidant properties were observed from the EA fractions of G. corticata and U. faciata. dichloromethane (DCM), fraction of N. zanardinii showed significantly higher total antioxidative activity, DPPH radical scavenging and power reduction in comparison to...

  19. Quantification of individual phosphorus forms in surface sediments of the Southern Caspian Sea - Iranian Coast: A sequential extraction procedure

    Niyazi, L.; Chaichi, M.J.; Nasrollahzadeh Saravi, H.; Najafpour, S.
    Seventy-two sediments from four stations (Anzali, Tonekabon, Noshahr and Amirabad), located in Caspian Sea-Iranian coast were examined on the basis of P-fractionation in autumn and winter of 2013-2014. Several forms of the phosphorus in sediment were separated and extracted according to sequential extraction method. Then the extracted phosphorus in each fraction was determined by UV–Vis spectrophotometry. In addition, total concentrations of Ca, Fe and Al in sediment fractions were also measured by atomic absorption spectroscopy. In autumn the rank order of P-fractions was: Ca-P>Residual-P>BD-P>Al-P>loosely-P and in winter it was: Ca-P>BD-P>Residual-P>Al-P>loosely adsorbed-P. In both season the loosely adsorbed phosphorus (NH4Cl–P) represented...

  20. The influence of sodium chloride replacement with potassium chloride on quality changes of hot smoked kilka (Clupeonella cultriventris caspia) during storage at ± 4°C

    Faralizadeh, S.; Zakipour Rahimabadi, E.; Khanipour, A.A.
    The aim of this work was to study the effect of sodium chloride replacement with potassium chloride on quality changes of hot smoked Kilka during storage at ± 4°C. To achieve this, after initial preparation, samples were exposed to brining process in two salts. This study was designed in two stages: in the first stage, different levels of salt replacement were used to select the best smoked treatment based on sensory test. In this stage, treatments were as: control (100% of NaCl), treatment 1 (75%NaCl/25%KCl), treatment 2 (50% NaCl/50%KCl), treatment 3 (25%NaCl/75%KCl), treatment 4 (100% of KCl). Samples were processed...

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