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  • Author or Editor: S. A. Saber x
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Influence of plant leaf texture of camphor, guava and fig on development, reproduction and life table parameters of the phytoseiid mite, Cydnoseius zaheri (Yousef and El Borolossy) was studied at 27 °C and 70% R.H. as rearing substrates. Cydnoseius zaheri successfully developed and reproduced on different plant leaves. Guava and camphor leaves were the most appropriate surfaces as individuals induced the shortest generation period and the highest reproduction rate. In contrast, fig leaf was the least suitable surface. A total of 53.0, 41.6 and 36.9 eggs/&8482; were obtained when guava, camphor and fig leaves were provided as rearing substrates. The intrinsic rate of increase (rm) and the finite rate of increase (exp rm) were 0.280 and 1.323 on camphor, 0.261 and 1.298 on guava and 0.169 and 1.183 on fig, respectively. Cydnoseius zaheri showed the highest fecundity rate (Mx), which compensated its lowest survival rate (Lx), on guava leaf. However, the predator exhibited the highest survival rate and the lowest fecundity rate on fig leaf.

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The direct toxicity of some mineral and plant oils to the eggs and females of the two spotted spider mite Tetranychus urticae Koch was tested. KZ oil was toxic to the egg stage compared to adult female. In contrast, Natur'l oil has a close toxic effect for both stages of T. urticae. Bio-dux oil was proved to be toxic to adult female and relatively in toxic to egg stage. Females of T. urticae suffered a depression in reproduction and shortened longevity when kept on plant leaves previously treated with different oils. Laboratory studies indicated that the vegetable oil Natur'l oil was effective on all biological aspects of T. urticae studied.

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The direct toxicity of some mineral and plant oils to adult females of the predacious mites, Amblyseius barkeri (Hughes) and Amblyseius zaheri Yousef and El-Borolossy were tested. KZ oil was the most toxic to females of A. barkeri and A. zaheri (LC50 = 0.391 and 0.308%, respectively). In contrast, Natur'l oil was relatively intoxic to females A. zaheri and A. barkeri. Bio-dux, Capl-2 and Natur'l oils have a close toxic effect for both predacious mites. Females of A. barkeri and A. zaheri suffered a depression in reproduction when sprayed with conc. = LC50 of each oil and kept on plant leaves previously treated with different oils. Laboratory studies indicated that the vegetable oil Natur'l oil was the least effective oil on all biological aspects of both predacious mites A. barkeri and A. zaheri in the laboratory.

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Abstract  

Aluminum is a pathogenic factor in some diseases, like Alzheimer and aluminum toxicity in dialysis patients. This subject signifies Al measurement in biological samples. Different methods have been proposed for Al determination. One of the known methods for the analysis of this element is instrumental neutron activation analysis (INAA). 31P, 28Si, 32Cl and 24Na interfere the determination of Al in this method. In this study, the effects of high amounts of 38Cl and 24Na on the measurement of 28Al are discussed. The data gathered by the detector is filtered by an equation named digital low pass filter equation with the help of a computer. The net-areas of filtered and non-filtered peaks of 28Al are compared. Finally these areas are compared with the net-area of 28Al peak in the standard reference material, NIST-SRM-1547.

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Abstract  

Aluminum levels of serum and red blood cell (RBC) were determined by instrumental neutron activation analysis (INAA) in 15 patients undergoing long-term haemodialysis. In the sample, aluminum was bombarded with thermal neutrons due to 27Al(n,γ)28Al and was determined by measuring 1779 keV gamma-ray of 28Al (T 1/2 = 2.24 min) with a HPGe detector. Phosphorus, causing an important interference by the fast neutron reaction, 31P(n,α)28Al, was determined by the photometric method to correct the net-area under the 28Al gamma-peak. The one-sample Kolmogorov-Smirnov test was used to control the normality distribution of the aluminum levels in serum and RBC. The results obtained were found to be in agreement with the serum aluminum determination performed by electrothermal atomic absorption spectrophotometry. The statistical results show a correlation between the aluminum levels of serum and RBC.

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