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Showing 3 results for Taherizadeh
Nehleh Nasiri, Mohammad Reza Taherizadeh, Mohsen Gozari,
Volume 4, Issue 4 (Winter 2023)
Abstract
Background and Aim: To overcome the crisis of antibiotic resistance, the development of more effective antibiotics without side effects is an urgent need. Meanwhile, the bacteria associated with sea sponges have a good potential for discovering new antimicrobial compounds with a large variety of secondary metabolites. The present study was conducted with the aim of determining the antimicrobial activity of bacteria associated with the marine sponge Haliclona sp collected from the Persian Gulf.
Methods: In the present study, the antimicrobial effects of bacteria associated with the marine sponge Haliclona sp. collected from Lark and Kish islands in the Persian Gulf, were studied against Gram-positive bacterium Micrococcus luteus. After identifying and separating the samples, purification of sponge-related bacteria was done. Isolation and purification were done on culture media including Starch caseinnitrate agar, Marine zobell agar, Glycerol asparagine agar, Marinesponge agar. Then, in order to screen the biological activities of the purified bacteria, a nutrient broth culture medium was used. Finally, the antimicrobial activity of the isolated bacteria was measured using the well diffusion method against the gram-positive bacterium Micrococcus luteus.
Results: The highest amount of bacteria associated with the sponge Haliclona sp. related to MSA, SCNA, MZA, and GAA culture media with the isolation of CFUg-1, were 5.88±0.05, 4.87±0.05, 4.20±0.03 and 2.75±0.23 related to sponges collected from Lark Island and 6.15±0.07, 5.08±0.05, 4.90±0.07 and 4.19±0.19 related to the sponges collected from the Kish island, respectively. As a result of purification, nearly 121 bacterial strains were purified, of which 12 purified bacterial strains had antibacterial activity.
Conclusion: The current findings demonstrated that the marine sponge Haliclona sp. has significant antibacterial effects; as a result, this marine sponge is a suitable candidate in future studies for the isolation of effective antibacterial compounds.
Mohaamad Amin Salehi Domshahri, Mohammad Reza Taherizadeh, Adnan Shahdadi,
Volume 6, Issue 1 (Spring 2024)
Abstract
Background and Aim: Environmental pollution by heavy metals is one of the basic environmental problems. Heavy metals are of special importance due to the toxic effects of the environment in various aquatic species and the creation of the phenomenon of zoster enlargement. In aquatic ecosystems, molluscs form a large group of aquatic animals. Among the molluscs, since they move less in coastal areas, they are known as one of the suitable options for measuring the level of pollution. The purpose of this study was to investigate the accumulation of lead, nickel and cadmium heavy metals in the muscle tissue of 30 samples of sea flounder Peronia peronii, in the coastal waters of Hormozgan province (Bander Lange and Qeshm Island).
Methods: 30 samples were collected from each station separately and after transferring the samples to the laboratory and biometry, the amount of heavy metals accumulation in them was investigated.
Results: Observations indicated that the concentration of lead and nickel in sea flounder muscle in Bandar Lange was significantly lower than the limit defined in international standards (P<0.05) and the concentration of cadmium in sea flounder muscle in Bandar Lange was significantly higher. It was above the limit defined in international standards (P<0.05). The concentration of cadmium in the tissues of Bandar Lange samples was significantly higher than Qeshm Island (P<0.05). The results obtained from the relationship between the concentration of nickel, lead and cadmium and the average total weight in the regions showed that there is a significant relationship between the amount of accumulation of the mentioned metals and the total weight factor, and a positive correlation was observed with the total weight (P<0.05). The results obtained from the relationship between the concentration of nickel, lead and cadmium and the average total weight in the regions showed that there is a significant relationship between the amount of accumulation of the mentioned metals and the total weight factor, and a positive correlation was observed with the total weight (P<0.05).
Conclusion: The present study showed that the results obtained from the relationship between the concentration of nickel, lead and cadmium and the average total length of Peronia peronii in Bandar Lange and Qeshm Island showed that there is a significant relationship between the accumulation of the mentioned metals and the total length factor. and a relatively negative correlation was observed with the total length of the sea lichen (P>0.05).
Zohrah Barkhordari Ahmadi , Mohammad Reza Taherizadeh,
Volume 6, Issue 3 (Autumn 2024)
Abstract
Background and Aim: The concentration of heavy metals in aquatic ecosystems is assessed in water, sediments, and living organisms. Typically, heavy metals are found in the lowest concentrations in water, with significant accumulation occurring in sediments, followed by increased levels of bioaccumulation in living organisms. This study aims to measure the concentrations of heavy metals -chromium (Cr), nickel (Ni), zinc (Zn), copper (Cu), arsenic (As), iron (Fe), lead (Pb), and cadmium (Cd)- in the sediments of Khor Jask and Yek Shabah Hormozgan Province.
Methods: To identify environmental pollution caused by heavy metals, sample locations were first determined using GPS. Surface sediment samples were collected using a grab sampler, with 30 samples taken from Jask (both intertidal and subtidal zones) and 30 samples from the Yek Shabah. After drying and acid digestion, a flame atomic absorption spectrometer was employed to determine the concentration of heavy metals, followed by the calculation of the enrichment index.
Results: The results indicated significant differences in the average concentrations of the studied elements across different stations (P<0.05). In the sediments of the Jask estuary, the highest average concentration was found for chromium at 59±45.73 µg/g, while the lowest was for cadmium at 0.14±0.04 µg/g. In contrast, the Yek Shabah estuary sediments exhibited an average concentration of 101.33±5.03 µg/g for nickel and 0.16±0.01 µg/g for cadmium. According to the Mueller geochemical index, the sediments in the studied areas were classified as unpolluted to slightly polluted.
Conclusion: Overall, the findings suggest that the sediments of the Yek Shabah estuary fall within the category of low to moderate pollution, while the Jask estuary is either free from pollution or exhibits low levels of metal pollution in Hormozgan Province. In terms of enrichment factors, all studied elements -except arsenic- showed minimal enrichment. The Yek Shabah estuary displayed very high enrichment for arsenic, whereas the Jask estuary demonstrated minimal enrichment.
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