Mohammad Ibrahim Mahmoud

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The polyamines spermine, spermidine and putrescine share some basic structural features with L-arginine, the substrate of nitric oxide (NO) synthase. The effects of the polyamines on neuronal NO synthase activity were studied in cytosolic preparations of rat cerebellum and cultured cerebellar granule neurons. Spermine, spermidine and putrescine all(More)
The compound 4-(diethylamino)benzaldehyde (DEAB) is a potent inhibitor of cytosolic (class 1) aldehyde dehydrogenase (ALDH) in vitro and can overcome cyclophosphamide resistance in murine leukemia cells characterized by their high content of ALDH. In this study, we examined the in vivo effect of DEAB in mice on ethanol metabolism and on antipyrine clearance(More)
In this paper, we provide an exact closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of the phase noise, frequency offset, and amplifier nonlinearities of the soft envelope limiter (SEL). A simplified approximate expression is also obtained for the(More)
In this paper, we provide an exact closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of phase noise, frequency offset, and amplifier nonlinearities of the soft envelope limiter (SEL). This formula describes explicitly the various parameters with the(More)
  • M I Mahmoud
  • 1978
Rates of glucose uptake in baker's yeast and in the osmophilic yeasts D. hansenii and S. rouxii were investigated at different values of water activity of the milieu, as regulated either by glycerol or sodium chloride. In both cases, D. hansenii could maintain relatively higher rates of glucose uptake. At lower values of water activity, sodium chloride(More)
In this paper, we provide a simple closed-form expression of the effective signal-to-noise ratio (SNR) for orthogonal frequency division multiplexing (OFDM) performance under the combined effect of synchronization errors (i.e. phase noise, carrier frequency offset, Doppler spread, sampling frequency offset, and timing jitter), transmitter I/Q imbalance,(More)
A new quantitative structure-activity model for the aromatic hydrocarbon (Ah) receptor, which completely eliminates multiple regression analysis in its formulation, is reported. Taking the polychlorinated dibenzo-p-dioxins (PCDDs) as model xenobiotics, the binding affinity of a PCDD relative to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) was found to be(More)
Eudragit patches containing salbutamol sulphate were prepared and evaluated as a rate-controlling membrane for transdermal use. The effect of different Eudragit polymers and various plasticizers on the permeability and mechanical properties of the prepared patches were studied. Drug patches of Eudragit polymers were prepared by a casting method employing(More)
Isoniazid (INH) albumin microspheres were prepared by two different stabilization processes: chemical denaturation using glutaraldehyde and heat denaturation. The extent of stabilization was characterized by the solubility of the microspheres. In vitro drug release rates were correlated to the stability of the microspheres and the results showed that the(More)
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