توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: Global Journal of Animal Scientific Research، دوم،شماره۱، ۲۰۱۴، سال ۰
تعداد صفحات: ۸
The microbial quality of beef, table and apron in five meat retail shops in the Yendi Municipality of Ghana was investigated in order to ascertain their safety. The shops were selected from Central market A (external), Central market A (internal), Central market B, Central mosque and Taxi rank. A total of 45 samples were collected, 9 from each meat shop (retailer). The samples were stored under 4oC for transportation to the laboratory. Microbiological analysis was carried out immediately upon arrival in the laboratory under aseptic conditions. Beef, table and apron samples from Central market B had the highest mean total bacterial count of 5.8×107 cfu\cm2, followed by Taxi rank (9.5×106 cfu\cm2), Central mosque (1.5×106 cfu\cm2), Central market A (external) (1.0×106 cfu\cm2) and Central market A (internal) (8.1×105 cfu\cm2). Mean bacterial count of beef, table and apron were 5.0×106 cfu\cm2, 3.7×107 cfu\cm2 and 3.1×105 cfu\cm2, respectively. Table surface bacterial count from Central market B was significantly higher (p0.05) than bacterial counts from the other samples. Bacterial species identified on the beef, apron and table samples were Staphylococcus spp., Escherichia coli, Streptococcus spp., Pseudomonas spp., Proteus spp., and Bacillus spp. Among the five meat shops\retailers sampled, Central market B was the most contaminated shop. Table surfaces were also the most contaminated source compared to beef and apron. Staphylococcus spp. and Escherichia coli were the most common identified bacteria. There is the need for improvement is the standard of selling meat in the Yendi Municipality.
۲The Preparedness of Malaysian Multinational Construction Companies (MNCCs) in Providing Pre–Departure and Non–Technical Trainings for Their Expatriates
اطلاعات انتشار: World Applied Sciences Journal، بيست و پنجم،شماره۳، ۲۰۱۳، سال ۰
تعداد صفحات: ۸
Employees of multinational construction companies who have been selected for an assignment in a foreign country must be conditioned with all aspects of life abroad, which may be alien to them and their family. The success in implementing of an overseas assignment does not solely depend on an expatriate’s technical expertise. Non–technical issues such as the accompanying family and the host country’s culture also exert influence on the assignment. Data were collected from a questionnaire survey of 53 companies. It was found that a large proportion of companies did not provide pre–departure training. Many companies did not adequately prepare their employees on work, personal and family dimensions for an overseas transfer. Family needs such as spouse’s employment, children’s education and basic training for them for the life abroad were taken for granted. The high training costs, lack of training experts and time constraint were not the prime reasons for ignoring pre–departure training but the companies’ top management believed that such training could be substituted by employing experienced personnel.
اطلاعات انتشار: World Applied Sciences Journal، سي و دوم،شماره۱۱، ۲۰۱۴، سال ۰
تعداد صفحات: ۸
This study was carried out to evaluate the effects of adding polyethylene glycol (PEG 4000), sodium bentonite to Acacia saligna hay as a roughage in the diet to deactivate it's content of tannins. Twenty healthy growing Barki lambs averaged of 30.90±4.63 Kg body weight were randomly divided into four groups (five animals of each) in fattening trial lasted for 180 days. Nutrients digestibility, nitrogen balance, blood serum metabolites, rumen parameters, weight changes and average daily gain (ADG) were determined. Animal groups were fed on concentrate feed mixture (CFM)+ berseem hay (G1), CFM + acacia hay (G2), G2 diet + 5% PEG (G3) and G2 diet + 4% bentonite (G4). Results revealed that group one had higher values of digestibility coefficients for DM, OM, CP, CF, EE and NFE than the other groups. All animals were in positive nitrogen balance (from 3.99 to 12.13 g\h\d). The highest amount of nitrogen was in G1 and the lowest was G2. Ruminal total volatile fatty acids (TVFA's) and ammonia–nitrogen were increased to reach the peak value at 3hr post feeding. All serum blood metabolites were in normal ranges. Total dry matter intake was 1.69, 1.25, 1.39 and 1.42 Kg, for the experimental groups, respectively. Average daily gain was 149.22, 67.2 , 79.32 and 78.00g\d for the experimental groups, respectively. Finally, G1 recorded the best digestibility coefficients, nitrogen balance, total dry matter intake, total digestible nutrients (TDN), digestible crude protein (DCP), ADG with normal blood parameters compared with the others. However, Adding PEG and sodium bentonite to Acacia diet could be used to increase feed intake utilization as result of tannins deactivation.
۴Voltammetric Study of Cu(II) in Presence of Aspartic Acid and L–Phenyl Alanine at Different pH Media
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، هفتم،شماره۳، Jun ۲۰۱۵، سال ۰
تعداد صفحات: ۱۳
The voltammetric study of Cu (II) in presence of aspartic acid (Aa) and L–phenyl alanine (Pa) respectively has been carried out in buffer solution of different pH, scan rate and variation of Aa or Pa concentration. Cu(II) in presence of Aa and Pa has been found to undergo two anodic peaks follows two step two electron transfer anodic reaction. The peak positions of the voltammogram of Cu(II) in presence of Aa or Pa shifted with respect to that of uncoordinated Cu(II). The peak current of Cu(II) with ligands (Aa, Pa) decrease significantly compared with that of uncoordinated Cu(II) in the same experimental conditions. These behaviors may ascribe the formation of complex of Cu(II) with Aa and Cu(II) with Pa. The linear behavior of peak current with the square root of scan rate of Cu complexes indicates that the electrochemical processes are diffusion controlled. The effects of pH of Cu–Aa and Cu–Pa complexes were studied by varying pH from 3.5 to 5.5. The oxidation peak current increases with the decrease in pH. At higher pH (pH>7) the complexes were almost electroinactive. This attributed that the electrochemical oxidation of the complexes are facilitated in lower pH media. The slope of the plots of Ep against pH of Cu– Aa and Cu–Pa complexes are 35–39 mV, indicates that the oxidation of Cu–Aa and Cu–Pa complexes proceeded via 2e−\2H+ processes. The complexes were formed by the addition of Aa or Pa into Cu(II) and the maximum interaction has been found for 1:3 molar ratio at pH 3.5. The mode of interaction of Aa and Pa with Cu(II) has been found to be similar.
اطلاعات انتشار: International Journal Of Environmental Research، چهارم،شماره۴، Autumn۲۰۱۰، سال ۰
تعداد صفحات: ۱۰
The aim of this research was to optimize bioremediation of seawater samples spiked with 1000 mg\L crude oil for removal of n–alkanes (C12H26 to C34H70). Bioaugmentation experiments were performed at laboratory scale: each bioreactor contained 250 ml dispersed crude–oil–contaminated seawater, indigenous acclimatized microorganism and nitrogen and phosphorus at concentrations based on central composite design (CCD) calculations. Three independent variables, time, nitrogen and phosphorus, were investigated and the experimental data obtained were fitted to a second–order polynomial mathematical model with multiple regressions. The obtained Model F–value of 97.12 and probability F 0.0001 implies the model is significant. Hydrocarbon analyses were carried out using a gas chromatograph equipped with flame ionization detector (GC\FID). During 28 days of experimentation, a maximum of 85.35% total n–alkane removal was observed. Numerical optimization was achieved based on desirability functions. Using 188.71 mg\L nitrogen and 18.99 mg\L phosphorus, design of experiment (DOE) software predicted 91.00% removal. A removal of 92.04% was observed experimentally, in close agreement with the predicted value.
۶Synthesis, characterization and biological screening of different carbamates derived from 7–hydroxy–4–methyl–2H–1–benzopyran–2–one
نویسنده(ها): Aziz، UR، Rehman Aziz، UR، Rehmana، S. Naeem، M. A. Abbasi، S. Rasool، K. Nafeesa، I. AHMED، S. Afzal
اطلاعات انتشار: Scientia Iranica، بيست و دوم،شماره۶، ۲۰۱۵، سال ۰
تعداد صفحات: ۸
A facile and environmentally benign series of carbamates derived from coumarin were synthesizedThe synthesis of 7–hydroxy–4–methyl–2H–1–benzopyran–2–one(3)was carried out by gearing up resorcinol (1) and ethyl acetoacetate (2)in a strong acidic media. Carbamates, 7and8,were synthesized by reacting phenylchloroformate (4) with substituted aliphatic amines, 5 and6, under dynamic pH control in aqueous media in the presence of Na2CO3 solution. The molecules 37 and 8 werebrominated to 3a7a and8a. The molecules 99a10 and 11 were synthesized by further reaction of 3 and3a with the electrophilic carbamates, 77a and 8 in a polar aprotic solvent using LiH as an activator. Finally, the compound 12 was synthesized by the nitration of 10. Structures of all the compounds were determined by IR, 1HNMR, 13C–NMR and EI–MS spectroscopic techniques. The bioactivity results of all the synthesized compounds against four gram–negative and two gram–positive bacteria showed that the synthesized coumarin derivatives exhibited moderate to good %age inhibition activity.
۷Use of Tank–mix Adjuvants to Improve Effectiveness and Persistence of Chlorpyrifos and Cyhalothrin Formulations
نویسنده(ها): S. A. M Abdelgaleil، N. F. Abdel، Aziz، E. A. Sammour، A. M. El، Bakry، S. M. I. Kassem
اطلاعات انتشار: Journal of Agricultural Science and Technology، هفدهم،شماره۶، ۲۰۱۵، سال ۰
تعداد صفحات: ۱۱
The use of adjuvants enhances the insecticide efficiency and increases the persistence of insecticides. In this study, the effect of adjuvants on the toxicity of chlorpyrifos and cyhalothrin formulations were investigated under laboratory and field conditions. The comparative toxicity of two chlorpyrifos [(48% Emulsifiable concentrate (EC)] formulations (Dursban and Pyrifos El Nasr), two cyhalothrin (5% EC) formulations (Halothrin Gold El Nasr and Lambada Mox) and two adjuvants (Top Film and Tritone K) were examined against the second and the fourth larval stages of Spodoptera littoralis. The effect of adjuvants on the toxicity of chlorpyrifos and cyhalothrin formulations were investigated under laboratory and field conditions. The results showed that Dursban exhibited the highest toxicity against the second and fourth larval stages of S. littoralis with LC50 values of 0.2 and 1.11 mg L–1, respectively. In contrast, Pyrifos El Nasr had the lowest toxicity against both larval stages. The results of joint toxic effect between adjuvants and insecticides indicated that adjuvants revealed potentiating effect on the toxicity of four insecticide formulations as co–toxicity factor values were greater than +20. Mixing the adjuvants with chlorpyrifos and cyhalothrin formulations in spraying tank before application of insecticides in field strongly increased the toxicity and the persistence of insecticides. Cyhalothrin formulations mixed with adjuvants gave continued significant mortality through 21 days, while chlorpyrifos gave continued significant mortality through 15 days of treatment. However, chlorpyrifos and cyhalothrin formulations without mixing with adjuvants gave significant mortality through 3 to 4 days of treatments. These results indicated that adjuvants increased efficiency and residual effect of chlorpyrifos and cyhalothrin commercial formulations. Therefore, the adjuvants can be used for reducing the number of applications in the season and the application rates of insecticides.
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