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Search Results: 1 - 10 of 2024 matches for " Alireza Safahieh "
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Heavy Metals Concentration in Mullet Fish, Liza abu from Petrochemical Waste Receiving Creeks, Musa Estuary (Persian Gulf)  [PDF]
Alireza Safahieh, Fazel Abdolahpur Monikh, Ahmad Savari, Abdolmajid Doraghi
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.29140
Abstract: Fish in estuaries, especially those live near petrochemical area, may be exposed to various kinds of contaminants such as heavy metals. This study was to investigate the variations of heavy metals in Liza abu from the Musa estuary which receives petrochemical wastes. Fish samples were obtained from five different creeks. The samples were dissected into liver, gill and muscle, acid digested and their heavy metals level were analyzed. The results showed that the concentration of Cd, Co, Cu, Ni and Pb in muscle ranged 0.08-0.44, ND-1.63, 0.89 - 4.28, 0.48 - 2.73 and 0.5 - 2.50 (µg/g) respectively. Their concentrations in liver were 0.44 - 2.03, 0.5 - 2.80, 5.05 - 36.22, 0.48 - 4.91 and 0.66 - 5.74 (µg/g) respectively. The concentration of these metals in gill was 0.32 - 2.72, 0.29 - 1.10, 4.33 - 6.03, 4.61 - 17.52 and 2.64 - 21.41 (µg/g) respectively. Generally, the level of heavy metals in muscle tissue of Liza abu was lower than the general standard.
Serum Biochemical Change Induced by In vitro Sub Chronic Mercury Chloride in Yellowfin Sea Bream (Acanthopagrus latus)
Aliakbar Hedayati,Alireza Safahieh,Ahmad Savari,Abdolali Movahedinia
Iranica Journal of Energy and Environment (IJEE) , 2011,
Abstract: Biochemical parameters are indicators measured in a biological system which can be related to exposure to, or effects of, a contaminant compound. In current study some serum biochemical parameters were measured in order to investigate patterns of response and change caused by the mercury contamination in yellowfin sea bream. According to the LC50, five mercury treatment was selected. Serum glucose was measured photometrically based on the quantification of NADH after a glucose oxidation catalyzed by glucose dehydrogenase. Serum total protein levels were determined with bovine serum albumin serving as standard. Values recorded for activity of total protein show high significance depletion (P<0.001) with mercury exposed. Although glucose was increase in different treatment, but there was not find significant variation. Results of the present investigation indicated that the sub- acute mercury concentrations tested is a toxic substance in yellowfin sea bream and may cause several changes in the serum biochemical parameters.
Distribution and Sources of Polycyclic Aromatic Hydrocarbons in the Sediment of Bushehr Coastal Zone-Iran
Masoomeh Mahmoodi,Alireza Safahieh,Yadollah Nikpour,Kmal Ghanemi
Iranica Journal of Energy and Environment (IJEE) , 2012,
Abstract: Polycyclic aromatic hydrocarbons (PAHs) concentrations in sediments measured from five stations in coastal area of Bushehr-Iran. Total PAHs concentration ranged from 844.9 to 4790.3 ng g-1 in summer and 935.0 to 4972.0 ng g-1 in winter. Significant difference was observed between total PAHs concentration in studied stations (P<0.05). Among the studied stations tPAHs concentration was higher in Rafael and followed by Sheghab station. The lowest level of tPAHs observed in Abshirinkon station. There was no significant difference between tPAHs concentration in August and February (P>0.05). Based on the number of aromatic rings in the molecular structure, the composition pattern of PAHs was different within studied stations. The studied stations receives their PAHs from both petrogenic and pyrolitic sources. The level of PAHs contamination in the Bushehr coastline founded to be moderate to high compared with other studied locations. Regular monitoring of PAHs contaminant in the region is recommended.
Detection of Range Finding Test of Mercury Chloride in Yellowfin Sea Bream (Acanthopagrus latus)
Aliakbar Hedayati,Alireza Safahieh,Ahmad Savari,Jasem Ghofle Marammazi
Iranica Journal of Energy and Environment (IJEE) , 2010,
Abstract: Toxicity tests allow the determination of pollution effects, providing direct evidence of the biological responses of marine organisms to contaminants. Fifty four yellow fine sea bream all immature male in same size (120 g final body weight average) were obtained from Mahshahr creeks with hooks in a Upon capture. In laboratory Fish maintained in a seawater re-circulatory system (300-L tanks) equipped with physical/biological filters and with aeration. All samples were acclimated for one weeks in a 15 aerated fiberglass tank containing 46 ppt saltwater maintained at 25 C under a constant 12:12 L:D photoperiod. Acclimatized Fish were fed daily with a live feed (fresh shrimp) and daily we check water quality and water parameters. Hg2+ tested concentrations were 20, 50, 100, 200, 500, 1000, 2000, 5000 and10000 μg/l, Groups of six male yellow fine sea bream (120 g) were exposed for 96 h to each of the Range Finding Test for LC50, in fiberglass tank equipped with aeration with 100 l of test medium. The control group was exposed to filtered sea water in similar conditions. Test medium was not renewed during the assay and no food was provided to the animals. Values of pH, Temperature, and salinity were measured at time 0, 24, 48, 72 and 96 h. At the end of the bioassay, Range values were determined as 500-1000 μg/l (fifty percent of mortality between 500 and 1000). Range Finding Test values indicated that mercury is more toxic to A. latus. Range obtained in the present study compare with corresponding values that have been published in the literature for other species of fish, show different Range of mercury in different species and even different time, but what is important, lower value of Range Finding Test for A. latus compare with most species and confirm sensitively of A. latus to low mercury doses.
Characterization of a chitinase with antifungal activity from a native Serratia marcescens B4A
Zarei, Mandana;Aminzadeh, Saeed;Zolgharnein, Hossein;Safahieh, Alireza;Daliri, Morteza;Noghabi, Kambiz Akbari;Ghoroghi, Ahmad;Motallebi, Abbasali;
Brazilian Journal of Microbiology , 2011, DOI: 10.1590/S1517-83822011000300022
Abstract: chitinases have the ability of chitin digestion that constitutes a main compound of the cell wall in many of the phytopathogens such as fungi. in the following investigation, a novel chitinase with antifungal activity was characterized from a native serratia marcescens b4a. partially purified enzyme had an apparent molecular mass of 54 kda. it indicated an optimum activity in ph 5 at 45oc. enzyme was stable in 55oc for 20 min and at a ph range of 3-9 for 90 min at 25oc. when the temperature was raised to 60oc, it might affect the structure of enzymes lead to reduction of chitinase activity. moreover, the km and vmax values for chitin were 8.3 mg/ml and 2.4 mmol/min, respectively. additionally, the effect of some cations and chemical compounds were found to stimulate the chitinase activity. in addition, iodoacetamide and idoacetic acid did not inhibit enzyme activity, indicating that cysteine residues are not part of the catalytic site of chitinase. finally, chitinase activity was further monitored by scanning electronic microscopy data in which progressive changes in chitin porosity appeared upon treatment with chitinase. this enzyme exhibited antifungal activity against rhizoctonia solani, bipolaris sp, alternaria raphani, alternaria brassicicola, revealing a potential application for the industry with potentially exploitable significance. fungal chitin shows some special features, in particular with respect to chemical structure. difference in chitinolytic ability must result from the subsite structure in the enzyme binding cleft. this implies that why the enzyme didn't have significant antifungal activity against other fungi.
An Actual Survey of Dimensionality Reduction  [PDF]
Alireza Sarveniazi
American Journal of Computational Mathematics (AJCM) , 2014, DOI: 10.4236/ajcm.2014.42006
Abstract:

Dimension reduction is defined as the processes of projecting high-dimensional data to a much lower-dimensional space. Dimension reduction methods variously applied in regression, classification, feature analysis and visualization. In this paper, we review in details the last and most new version of methods that extensively developed in the past decade.

A QMR-Type Algorithm for Drazin-Inverse Solution of Singular Nonsymmetric Linear Systems  [PDF]
Alireza Ataei
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2016, DOI: 10.4236/alamt.2016.64011
Abstract: In this paper, we propose DQMR algorithm for the Drazin-inverse solution of consistent or inconsistent linear systems of the form Ax=b where \"\"?is a?singular and in general non-hermitian matrix that has an arbitrary index. DQMR algorithm for singular systems is analogous to QMR algorithm for non-singular systems. We compare this algorithm with DGMRES by numerical experiments.
The Introduction of Promising Mineral Zones Bidkhan Area Using Satellite Imagery  [PDF]
Alireza Ashofteh
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.79093
Abstract: On the basis of new findings and some evidences related to porphyry mineralization, the exploration region of Bidkhan is considered as a promising mineral region for discovery of porphyry sort deposits. The findings from various sections indicate that diverse topological events in a zonal and regional time span have resulted in physiochemical (thermodynamic) systems leading to expansive alterations (metamorphism) and mineralization in the central region of Bidkhan area. Alterations such as Propylitic, Silicating, Argillic, Phyllic and even Potassic concentrates at an area of about 10 km2 together with such structures as fissures have created the required and suitable condition for the formation of thermodynamic systems. Such systems are related to mineralization fluids mineralizer that accompanies the sort of activities that are clearly indicative of the existence of an active igneous source all forming a terrene at Bidkhan region which is very similar to mineralization porphyry systems.
International Contribution to Nipah Virus Research 1999-2010
H. Safahieh,S. A. Sanni,A. N. Zainab
Computer Science , 2013,
Abstract: This study examines 462 papers on Nipah virus research published from 1999 to 2010, identifying the active authors, institutions and citations received. Data was extracted from SCI-Expanded database, (Web of Science) and analyzed using descriptive figures and tables. The results show the growth of publication is incremental up to 2010 even though the average citations received is decreasing. The ratio of authors to articles is 1330: 426. The active contributing countries are USA (41.0%), Australia (19.3%), Malaysia (16.0%), England (6.5%) and France (5.6%). The productive authors are mainly affiliated to the Centre for Disease Control and Prevention, USA and Commonwealth Scientific and Industrial Research Organization (CSIRO) in Australia and University of Malaya Medical Centre, Malaysia. A total of 10572 citations were received and the ratio of articles to citation is 1: 24.8. Collaboration with the bigger laboratories in USA and Australia is contributive to the sustained growth of published literature and to access diverse expertise.
Antibiotic sensitivity pattern of common bacterial pathogens in NICU and neonatal ward in Hamedan province of Iran  [PDF]
Alireza Monsef, Fatemeh Eghbalian
Health (Health) , 2010, DOI: 10.4236/health.2010.26094
Abstract: Bacterial pathogens and drug resistance are different in hospitals of each country. In this study we determined bacterial path- ogens and drug sensitivity in the neonatal ward and neonatal intensive care unit (NICU) in Ekbatan hospital in Hamedan. This cross-sectional descriptive study was done on 1150 hospitalized neonates in neonatal and NICU wards of Ekbatan hospital of the Hamadan university of medical sciences from September 2004 to September 2006. Blood, cerebrospinal fluid (CSF), urine, stool, eye excretion, synovial fluid, umbilical secretion and ascitic fluid were evaluated. Positive cultures were evaluated for antibiotic resistance with disk diffusion test methed. All of the data in questionnaires was analyzed with SPSS 13. Cultures including blood, urine, CSF , stool, eye excretion, synovial fluid, umbilical secretion and ascitic fluid was done in 417 neonates (833 cultures). These cultures were including: urine, 323 cases (38.8%) blood 293 cases (35.2%), CSF 180 cases (21.6%) , stool 17 cases (2%), eye secretion 16 cases (1.9%) and other secretions (synovial, umbilical, etc) 4 cases (0.5%). The cultures were positive in 105 cases (25.2%). 60 male neonates (57.1%) and 45 female neonates (42.9%) were culture positive. The most common microorganisms were E coli 66.7% (70 cases), Klebsiella 10.5% (11 cases). Drug resistance was high in these microorganisms. The most common microorganisms were Ecoli and klebsiella. Drug resistance was high in the isolated microorganisms.
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