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Articles by Arash Omidi
Total Records ( 3 ) for Arash Omidi
  Arash Omidi
  The aim of this study was to introduce abscess on left thoracic wall of cattle as less common complication of traumatic reticulitis and finding the best way for diagnosing them. During two years, among 75 cases confirmed suffering from traumatic reticulitis, five cows with thoracic abscess were examined clinically, radiographically and ultrasonographically. Clinical signs observed included anorexia, pyrexia, abdominal pain and weight loss. All of the cases had a big abscess in the back portion of left humerus on the thoracic wall. In every case, the diagnosis was confirmed by the centesis and aspiration of the abscess. In all cows, radiographic findings revealed a metal foreign body in the reticulum penetrating it. Ultrasonography revealed a large reticular abscess with a well-developed capsule that appeared as echogenic deposits that were sometimes accompanied by hypoechogenic fluid. The abscess was elongated towards the left thoracic wall and appeared in the posterior portion of the left humerus. The abscess was incised and drained from body surface and the reticulum during a rumenotomy. After the abscess drainage and treatment with antibiotics, all cows recovered and became healthy. It is concluded that foreign bodies should be considered in the differential diagnosis of localised swelling on the thoracic wall and the best way for diagnosing them is a combination of clinical findings, laboratory testing, ultrasonography and radiography.
  Arash Omidi , Sohrab Mazloomi and Homayoon Farhangfar
  This study was conducted to determine the acute toxicity of lead acetate on Capoeta fusca. A total of 580 fishes with mean length of 12.28±0.14 cm and mean weight of 16.64±0.52 g. were divided into 15 control and treatment groups of fish. The fish were kept in 20 L aquariums and the procedure designed in static condition according to the Organization Economic Cooperation and Development (OECD) method. Mortality rate was recorded in 96 h and lead acetate LC50 was calculated by standard statistical method. LC50 of 10.992, 10.594, 9.338 and 7.575 mg L-1 were determined at 24, 48, 72 and 96 h post exposing respectively. In addition, minimum and maximum lethal concentrations of lead were determined as 4 and 12.5 mg L-1 and MAC was 0.7575 mg L-1. Lead acetate in soft water (Hardness 10 mg L-1) was highly toxic for fish but in hard water (Hardness: 310 mg L-1) had a little toxicity. High trend of lead for interaction with minerals such as calcium and carbonates is the major reason of this phenomenon. Lead toxicity is decreased with increase of water hardness and this is the cause of fish tolerance against some heavy metals pollution in natural environment. Lead intoxicated fish showed abnormal behaviors, restless and rapid circling.
  Sohrab Mazloomi , Abbas Esmaeili , Seyed Mahmood Ghasempoori and Arash Omidi
  We conducted a study to screen mercury (Hg) level in the Caspian Sea common cormorant (Phalacrocorax carbo) to determine the biological behavior of this element and to assess the exposure of wild fish-eating birds, which are a bioindicator to this pollutant. Mercury concentration was measured in liver, kidney, muscle and feathers. The mean concentration of mercury was 8.32±1.32, 9.25±1.71, 2.064±0.22 and 4.44±0.3 ppm in liver, kidney, muscles and feathers respectively. Hg concentration was highest in the kidney and liver (p<0.01). The amount of mercury accumulation obtained was as follows: Liver ≈ Kidneys > Feathers > Muscles. Hg concentration in the liver and muscle increased significantly with growth from juvenile to adult (p<0.05). Comparison of Hg concentration between males and females indicated that Hg concentration in the muscle (p<0.05) and kidney (p<0.01) was significantly different.
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