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    Wyświetlanie 1-4 z 4
    Tytuł:
    Response of vitamins A, E, hematological and serum biochemical markers in Crucian carp (Carassius auratus gibelio) exposed to environmental Pb2+ and Cd2+
    Autorzy:
    Khan, Sher
    Zhou, Peiyuan
    Liu, Xiaoyu
    Li, Hong
    Li, Jingna
    Rehman, Zia ur
    Ahmad, Ijaz
    Powiązania:
    https://bibliotekanauki.pl/articles/1039010.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    vitamins A and E
    hematology
    serum chemistry
    Crucian carp (Carassius auratus gibelio)
    Cd2+
    Pb2+
    Opis:
    Toxicity of Pb2+ and Cd2+ is a widespread issue in the world; however, few studies have been conducted to understand their effect at environmentally realistic concentration in a mixture. In the present study, Crucian carp was exposed to Pb2+ (30 µg·l-1), Cd2+ (100 µg·l-1) and their mixture (30+100 µg·l-1) for 96 h and 21 d period to assess changes in the liver and muscle vitamin A and E content, and hematological and serum biochemical parameters. The results indicated significant decline in the level of antioxidant vitamins A, E and alterations in the hematological and serum biochemical indices. The toxicity revealed anemia, impairment of the liver and kidney with evident responses after 21 d exposure due to additive effect of Pb2+ and Cd2+ in mixture. Moreover, the differential response of vitamins A, E and blood parameters to low levels of waterborne Pb2+ and Cd2+ in freshwater fish can be used as biomarkers for monitoring contamination of aquatic environment.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 3; 581-587
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Estimation and Mathematical Modelling of Tropospheric Radio Refractivity Based on Meteorological Data
    Autorzy:
    Alimgeer, K. S.
    Awais, M.
    Ijaz, B.
    Khan, S. A.
    Subhan, F.
    Ahmad, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/221069.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radio refractivity
    statistical estimation
    ITU
    mathematical modelling
    Opis:
    To obtain optimal performance, estimation of radio refractivity is essential in planning and design of radio links/systems. The dependence of radio refractivity on different climatic parameters such as temperature, pressure, humidity and scale height is studied. The method proposed by International Telecommunication Union (ITU) is used in calculation of tropospheric radio refractivity. The main objective of this work is to formulate a mathematical equation/expression which can be used to predict/estimate the value of radio refractivity for an arbitrary day of any year, with a low error of estimation, in a local environment. Sensitivity of radio refractivity to temperature, pressure and humidity has been evaluated for a period of 5 years from 2008 to 2012, in a particular area under consideration. The results presented for tropospheric radio refractivity take into consideration both the location height and scale height parameters. The results are analysed in terms of statistical measures such as the moving averages, probability density function, monthly mean values, and their corresponding standard deviations. Finally, a mathematical model is formulated to calculate the radio refractivity for any day of a whole year. Reliability of error analysis in respect to accuracy is also shown. It was implemented in the industrial enterprise.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 115-128
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation induced degradation of Congo red dye: a mechanistic study
    Autorzy:
    Muner, Majid
    Saeed, Muhammad
    Bhatti, Ijaz Ahmad
    Haq, Atta-ul
    Khosa, Muhammad Kaleem
    Jamal, Muhammad Asghar
    Ali, Saddaqat
    Powiązania:
    https://bibliotekanauki.pl/articles/146490.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Congo red
    radiolytic product
    irradiation
    advanced oxidation process
    Opis:
    Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The lambda max of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a signifi cant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.
    Źródło:
    Nukleonika; 2019, 64, 2; 49-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An alternative and indirect statistical modeling method for viscosity estimation and its experimental validation for low styrene content polyester resin
    Autorzy:
    Nawaz, A.
    Islam, B.
    Ijaz, M. Z.
    Saleem, U.
    Khattak, M. S.
    Ahmad, S. N.
    Maqsood, N.
    Ali, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/778495.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    indirect method
    polyester resin
    statistical relation
    Ford viscosity cup
    Opis:
    We propose an indirect method of ASTM D-1200 for measurement of viscosity from 0.1 to 30 stokes (St) using Ford cup 5 (range 2~ 12 St) by developing a statistical relation. General purpose low styrene content polyester resin (without adding initiator, hardener and accelerator) was used for viscosity measurement. In existing ASTM D 1200 standard, ford cups (1-4) are used to measure the viscosity up to 2 St, while fifth cup is used for measurement from 2 to 12 St. Viscosity above 12 St is not estimated using existing ASTM D- 1200 method. In contrast, our method and statistical relation proposed in this paper estimates viscosity in the flexible range of 0.1 to 30 St by using Ford cup 5 only. The estimated values were confirmed by existing ASTM D-1200 (0.1 to 12 St) and by using Ubbelohde viscometer (12 to 30 St). Values estimated above 12 St are from the proposed model are also in good conformance (percentage error ~ 5% or less) with experimental results. The satisfaction level of the estimated values with the experiments suggests that the model has also the potential for application to paints, polymer and oil industry.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 60-65
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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