Two orders of zooblankton,were studied Cladocera and Copepeda in two classes Calanoida and Cyclopoda, where it was studied inside floating cages and for breeding fish placed in the Tigris River in the Rashidiya area. Has been study The population density of zooplankton groups and measure some chemical and physical characters, was studie where she collected samples of zooplankton and water from two locations of cages (inside the cages, after 100m from cages). The study was conducted within six months from January to the end of June 2014 during which there was study of the Wallace pH, water temperature, biological oxygen demand and dissolved oxygen, as to the zooplankton study the species disappeared inside cages of fish and existed after 100 meters from the cages also the different between the individual through the month study the highest range in June reached to 16.55 individual/ liter and the lowest range record in January reached to 6.60 individual/ liter, in addition to having changes in the physical and chemical factors, where the high water temperature ranged to 32CËš where the density of three zooplankton in this range is 16.10 per individual/ liter and the low range record in January amounted to 10CËš and three phytoplankton density are 6.50 per individual/ liter and highest rate of pH recorded in April to 8.02 and the lowest rate was recorded in May reached to 7.42 also recorded the density of phytoplankton in this rate between 9.02 and 7.46 individual/ liter, respectively. Also ranged dissolved oxygen values in the water has highest rate recorded in March amounted to 7.70 mg/L, while the three phytoplankton density reached to 12.14 individual/ liter, and its lowest rate was recorded in May to 5.95 mg/L and density of the three individual phytoplankton to 7.46 per individual/ liter. The value of the BOD has shown highest in February reached to 6.50 mg/L and lower rate in April reached to 4.20 mg/L and recorded phytoplankton density during these rates between 8.61 and 9.02 individual/ liter, respectively
A new, simple, sensitive and fast developed method was used for the determination of methyldopa in pure and pharmaceutical formulations by using continuous flow injection analysis. This method is based on formation a burgundy color complex between methyldopa andammonium ceric (IV) nitrate in aqueous medium using long distance chasing photometer NAG-ADF-300-2. The linear range for calibration graph was 0.05-8.3 mmol/L for cell A and 0.1-8.5 mmol/L for cell B, and LOD 952.8000 ng /200 µL for cell A and 3.3348 µg /200 µL for cell B respectively with correlation coefficient (r) 0.9994 for cell A and 0.9991 for cell B, RSD % was lower than 1 % for n=8. The results were compared with classical method UV-Spectrophotometric at λ max=280 n
... Show More
(2)
The gas sensing properties of Co3O4and Co3O4:Y nano structures were investigated. The films were synthesized using the hydrothermal method on a seeded layer. The XRD, SEM analysis and gas sensing properties were investigated for Co3O4and Co3O4:Y thin films. XRD analysis shows that all films are polycrystalline in nature, having a cubic structure, and the crystallite size is (11.7)nm for cobalt oxide and (9.3)nm for the Co3O4:10%Y. The SEM analysis of thin films obviously indicates that Co3O4possesses a nanosphere-like structure and a flower-like structure for Co3O4:Y.The sensitivity, response time and recovery time to a H2S reducing gas were tested at different operating
... Show More
(100)
(96)
