The paper presents results of the HPLC determination of sulphachloropyrazine residues (active component of the drug „Esb3 30%”) in muscle tissue and liver of broiler chickens inoculated with laboratory-grown coccidium in the course and after treatment with this sulphonamide.Extraction of sulphachloropyrazine from samples of broiler muscle tissue and liver was carried out with a mixture of solvents dichloromethane-methanol-acetic acid (90:5:5, v/v/v), followed by extract purification by chromatographic separation on a XAD-2 column and elution of sulphachloropyrazine residues with dichloromethane. The HPLC determination of sulphachloropyrazine residues was accomplished on a Bio Sil C-8 HL 5 ?m column with a mobile phase consisting of 60% aqueous solution of acetonitrile and NH3 (pH=9.5), using a UV detector at 254 nm.The method developed allows quantitative determination of the residues of the anticoccidial agent in broiler tissue samples with a detection limit of 0.02 ?g g–1. Recovery of the method for this type of samples with a complex matrix was satisfactory, the results ranging from 79.2(0.6 to 86.7(0.2% for muscle tissue and from 81.7(0.8 to 87.3(0.7% for liver.
Authors:Z. Lisiewska, W. Kmiecik, P. Gębczyński, and L. Sobczyńska
Cruz-Garcia, C., Gonzalez-Castro, M.J., Oruna-Concha, M.J., Lopez-Hernandez, J., Simal-Lozano, J.A. & Simal-Dandara, J. (1997): The effects of various culinary treatments on the pigment content of green beans ( Phaseolus vulgaris L.). Fd Res. int
Authors:É. Andrássy, J. Farkas, Zs. Seregély, I. Dalmadi, E. Tuboly, and V. Lebovics
Experiments were performed to study changes caused by irradiation or high hydrostatic pressure pasteurization of liquid egg white by differential scanning calorimetry, spectrofluorimetry, electronic nose measurements and NIR-spectrometry. The non-thermal pasteurization treatments were also assessed in relation to loss of carotenoid content, and lipid- and cholesterol oxidation of liquid egg yolk. Unlike radiation pasteurization, high pressure processing caused protein denaturation in egg white, which manifested in changes of its DSC-thermogram and intrinsic tryptophan fluorescence. Electronic nose testing showed changes of the head-space volatile composition of egg albumen, particularly as a function of radiation treatment. Both treatments caused changes in the NIR-spectrometric “fingerprint” of the liquid egg white. Various chemometric analyses of the results of the latter instrumental methods, particularly statistical techniques developed by the group of one of the co-authors of this article, demonstrated the potential for detection and characterization of the applied non-thermal processing techniques on liquid egg white. Irradiation induced more carotenoid degradation and lipid oxidation in liquid egg yolk than pressure processing.
Authors:Kalman Buzas, Peter Budai, and Adrienne Clement
One and a half year long field sampling was established in order to evaluate the contamination of storm water runoff. The event means (EMC) total petroleum hydrocarbons (TPH) concentration of the runoff was a function of the actual traffic intensity and the rainfall depth. It was concluded that this TPH, of which dominant component is the engine-oil (characteristically C28) does not form an ‘oil-in-water’ type emulsion in the condition of normal motorway-operation, but is interlocked to asphalt, rubber and soot particles of maximum some ten microns size. This condition influences the possibility, way and extent of separation alike. The separation equipments and their sizing applied so far are not suitable to achieve efficient surface water protection. Practical prevention method of accidental type environment pollution was also suggested. On the basis of the international literature evaluation, technical solutions capable to decrease the runoff pollution were summarized. Among these, useful calculation method was developed for designers to determine the sufficient storage capacity (water quality volume) of reservoirs applied for water quality protection. Monitoring technique of runoffs, which are characterized time dependent, variable pollutant concentrations by their nature, was proposed. It was stated that the administrative regulation should aim at the EMC instead of current concentration. Beside TPH information was gained on polycyclic aromatic hydrocarbons (PAHs), suspended solids, heavy metals, pH, and nutrient (N, P) pollution of the runoff, which are valuable for the grounding of further research results.
Authors:Evandro de Queiroz, Augusto Knoechelmann, Eliane de Moraes Medeiros, Cesar de Abreu, and Nelson de Lima Filho
In this work, in addition to the nitrous acid formed by reactive uptake of nitrogen dioxide (NO2) in water, it is proposed to reduce the nitrous ions levels by amino sulfonic acid (HSO3NH2) in a mechanically agitated reactor. To this end, the following parameters were considered: agitation speed, pH, temperature,
initial concentration of the reagents and their stoichiometric ratios. It was observed that the nitrous acid conversion (98.54%)
was enhanced in acidic medium (pH < 2.5), obeying a first-order reaction in relation to both reagents. A heterogeneous model
for nitrogen production was proposed and the kinetics for the gas–liquid process was formulated, where the kinetic rate constants
were in the range of 2.62–5.52 m3 kmol−1 s−1 and the gas–liquid mass transfer coefficients were in the range of 0.00502–0.00825 s−1.
Authors:H. Al-Maliki, Z. Károly, Sz. Klébert, and G. Kalácska
, Williams R. L. , Pond R. C. ( 2001 ), Plasma modification of PTFE surfaces. Part I: Surfaces immediately following plasma treatment . Surface and Interface Analysis , 31 , 385 – 396 . DOI: 10.1002/sia
One of the most complex cases for assessing the nuclear power plant safety is the evaluation of the response of the plant to an earthquake and calculation of the core damage frequency related with this. Plant level fragilities are convolved with the seismic hazard curves to obtain a set of doublets for the plant damage state. The standard methodology of the description of randomness and epistemic uncertainty of the fragility is based on the use of lognormal distribution. In the practice, because of large number and variety of types of components, variety of failure modes, further simplification is needed in spite of simplicity of the mathematic description of the fragility and its uncertainty. Sophisticated modeling and screening methods have to be applied for plant fragility development requiring enormous experience. Several practical assumptions utilized in the seismic PSA showing certain analogy with interval type description of uncertainties. In the paper an attempt is made for outlining some new options for nuclear power plant seismic fragility development based on the interval and p-box concept. The possibility for derivation of conditional probability of failure for cumulative absolute velocity is also highlighted.
, Kirkou A. , Stasinakis A. S. ( 2013 ). Quantitative and qualitative greywater characterization in Greek households and investigation of their treatment using physicochemical methods , Science of The Total
Influence of treatment with hot water, chemical scarification and storage time on germination of Virginia fanpetals, Sida hermaphrodita (L.) Rusby seeds
Buletyn Instytutu Hodowli i Aklimatyzacji Roślin
Authors:Adebayo Surajudeen Adekunle, Adekunle Akanni Adeleke, Peter Pelumi Ikubanni, Peter Olorunleke Omoniyi, Tajudeen Adelani Gbadamosi, and Jamiu Kolawole Odusote
solution heat treatment, the aluminum alloy is heated to a temperature range between 400 and 540 °C in order to re-dissolve the soluble alloying elements in solution to produce a single phase solution, that is, a solute-rich solid solution after holding at