Publications

Export 110975 results:
Sort by: Author Title Type [ Year  (Desc)]
1993
Youssef, S. A., A. Ramadan, and E. I. Ibrahim, "Comparative neuromuscular blocking potency of pipecuronium and pancuronium.", DTW. Deutsche tierarztliche Wochenschrift, vol. 100, issue 10, pp. 396-8, 1993 Oct. Abstract

The effects of pipecuronium bromide (Pi.) and pancuronium bromide (Pa.) on the contractile response of rat-phrenic nerve diaphragm and frog's musculus rectus abdominis preparation were studied. Pi. and Pa. were found to have a dose-dependent reduction in the contractile response of the tested preparation. Trials were made to estimate the potency of Pi. in a comparison with Pa. In this respect Pi. exhibited a more potent effect than Pa. The duration of action is about twice as long as that of Pa. in equieffective doses. Neostigmine rapidly and completely antagonises the neuromuscular blockade caused by Pi. and Pa.

Moneib, N. A., A. M. Shibl, M. A. El-Said, and E. M. el-Masry, "Macrolides induced suppression of virulence factors produced by Staphylococcus aureus.", Journal of chemotherapy (Florence, Italy), vol. 5, issue 5, pp. 289-92, 1993 Oct. Abstract

The effect of sub-MICs of azithromycin, clarithromycin and roxithromycin, as compared to erythromycin, on the production of coagulase, beta-hemolysin, lecithinase and deoxyribonuclease by Staphylococcus aureus was studied. All new macrolides completely inhibited coagulase and beta-hemolysin production and partially inhibited lecithinase and deoxyribonuclease. Such inhibition is not related either to growth inhibition or to inhibition of enzyme activity. Erythromycin, on the other hand, had no effect on coagulase or beta-hemolysin production but slightly suppressed the production of lecithinase and deoxyribonuclease. This inhibitory effect might have clinical significance if it was found to occur in vivo.

Atef, M., A. Ramadan, S. A. Youssef, and K. Abo El-Sooud, "Kinetic disposition, systemic bioavailability and tissue distribution of salinomycin in chickens.", Research in veterinary science, vol. 54, issue 2, pp. 179-83, 1993 Mar. Abstract

Salinomycin was administered to chickens orally and intravenously to determine blood concentration, kinetic behaviour, bioavailability and tissue residues. The drug was given by intracrop and intravenous routes in a single dose of 20 mg kg-1 body-weight. The highest serum concentrations of salinomycin were reached half an hour after oral dosage with an absorption half-life (t0.5(ab)) of 3.64 hours and elimination half-life (t0.5(beta)) of 1.96 hours. The systemic bioavailability percentage was 73.02 per cent after intracrop administration, indicating the high extent of salinomycin absorption from this route in chickens. Following intravenous injection the kinetics of salinomycin can be described by a two-compartment open model with a t1/2(alpha) of 0.48 hours, Vd ss (volume of distribution) of 3.28 litre kg-1 and Cl(beta) (total body clearance) of 27.39 ml kg-1 min-1. The serum protein-binding tendency of salinomycin as calculated in vitro was 19.78 per cent. Salinomycin concentrations in the serum and tissues of birds administered salinomycin premix (60 ppm) for two weeks were lower than those after administration of a single intracrop dose of pure salinomycin (20 mg kg-1 bodyweight). The highest concentration of salinomycin residues were present in the liver followed by the kidneys, muscles, fat, heart and skin. No salinomycin residues were detected in tissues after 48 hours except in the liver and these had disappeared completely by 72 hours.

Atef, M., A. Ramadan, S. A. Youssef, and K. Abo El-Sooud, "Kinetic disposition, systemic bioavailability and tissue distribution of salinomycin in chickens.", Research in veterinary science, vol. 54, issue 2, pp. 179-83, 1993 Mar. Abstract

Salinomycin was administered to chickens orally and intravenously to determine blood concentration, kinetic behaviour, bioavailability and tissue residues. The drug was given by intracrop and intravenous routes in a single dose of 20 mg kg-1 body-weight. The highest serum concentrations of salinomycin were reached half an hour after oral dosage with an absorption half-life (t0.5(ab)) of 3.64 hours and elimination half-life (t0.5(beta)) of 1.96 hours. The systemic bioavailability percentage was 73.02 per cent after intracrop administration, indicating the high extent of salinomycin absorption from this route in chickens. Following intravenous injection the kinetics of salinomycin can be described by a two-compartment open model with a t1/2(alpha) of 0.48 hours, Vd ss (volume of distribution) of 3.28 litre kg-1 and Cl(beta) (total body clearance) of 27.39 ml kg-1 min-1. The serum protein-binding tendency of salinomycin as calculated in vitro was 19.78 per cent. Salinomycin concentrations in the serum and tissues of birds administered salinomycin premix (60 ppm) for two weeks were lower than those after administration of a single intracrop dose of pure salinomycin (20 mg kg-1 bodyweight). The highest concentration of salinomycin residues were present in the liver followed by the kidneys, muscles, fat, heart and skin. No salinomycin residues were detected in tissues after 48 hours except in the liver and these had disappeared completely by 72 hours.

Atef, M., A. Ramadan, and K. Abo El-Sooud, "Pharmacokinetic profile and tissue distribution of monensin in broiler chickens.", British poultry science, vol. 34, issue 1, pp. 195-203, 1993 Mar. Abstract

1. The pharmacokinetics of monensin, including half-life, apparent volume of distribution, total body clearance, systemic bioavailability and tissue residues were determined in broiler chickens. The drug was given by intracrop and intravenous routes in a single dose of 40 mg/kg body weight. 2. Following intravenous injection the kinetic disposition of monensin followed a two compartments open model with absorption half life of 0.59 h, volume of distribution of 4.11 l/kg and total body clearance of 28.36 ml/kg/min. The highest serum concentrations of monensin were reached 0.5 h after intracrop dosage with an absorption half-life of 0.27 h and an elimination half life of 2.11 h. The systemic bioavailability was 65.1% after intracrop administration. Serum protein-binding tendency of monensin calculated in vitro was 22.8%. 3. Monensin concentrations in the serum and tissues of chickens after a single intracrop dose of pure monensin (40 mg/kg body weight) were higher than those after feeding a supplemented monensin premix (120 mg/kg) for 2 weeks. Monensin residues were detected in tested body tissues, collected 2, 4, 6 and 8 h after oral administration. The highest concentration was found in the liver. In addition, monensin residues were detected only in liver, kidney and fat 24 h after the last oral dose. No monensin residues could be detected in tissues after 48 h, except in liver which cleared completely by 72 h.

Ahmed, M. M., M. T. Khayyal, and M. M. el-Merzabani, "Hyperthermic potentiation of cisplatin cytotoxicity on solid Ehrlich carcinoma.", Tumori, vol. 79, issue 4, pp. 268-72, 1993 Aug 31. Abstract

BACKGROUND: Hyperthermia produces marked effects on many biochemical parameters of tumor cells and has been reported to potentiate the effect of many drugs. We therefore evaluated the possible synergistic effect between hyperthermia and cisplatin against solid Ehrlich carcinoma. The study was based on the measurement of some biologic characteristics in tumor tissues, namely: DNA, RNA, and protein content and their rate of synthesis as parameters for nuclear damage; total lipids and cholesterol as parameters for membrane damage; acid-phosphatase and acid-ribonuclease as parameters for lysosomal damage; and tumor volume as a direct parameter for tumor growth.

METHODS: Treatment of solid Ehrlich carcinoma by hyperthermia at 43 degrees C for 30 min for 3 successive days produced a 41.5% decrease in tumor volume, as well as a significant decrease in nucleic acids, protein contents and their rate of synthesis, in total lipids and cholesterol, and in acid-phosphatase and acid-ribonuclease. Chemotherapeutic management of the tumor by 5 mg/kg x 3 of cisplatin alone showed a continuous increase in tumor volume but at a lower rate than that of the untreated control. However, when cisplatin was given 1 h prior to hyperthermia, the tumor volume was significantly decreased by 82.6%.

RESULTS: The effects observed on all the investigated parameter were intensified when cisplatin was combined with hyperthermia. The results obtained suggest that hyperthermia may enhance the penetration of cisplatin to its target site inside the tumor cells due to a membrane-damaging effect. The enhanced lethality of cisplatin on tumor cells may also be due to the inhibition of DNA repair processes by hyperthermia.

Ahmed, M. M., M. T. Khayyal, and M. M. el-Merzabani, "Hyperthermic potentiation of cisplatin cytotoxicity on solid Ehrlich carcinoma.", Tumori, vol. 79, issue 4, pp. 268-72, 1993 Aug 31. Abstract

BACKGROUND: Hyperthermia produces marked effects on many biochemical parameters of tumor cells and has been reported to potentiate the effect of many drugs. We therefore evaluated the possible synergistic effect between hyperthermia and cisplatin against solid Ehrlich carcinoma. The study was based on the measurement of some biologic characteristics in tumor tissues, namely: DNA, RNA, and protein content and their rate of synthesis as parameters for nuclear damage; total lipids and cholesterol as parameters for membrane damage; acid-phosphatase and acid-ribonuclease as parameters for lysosomal damage; and tumor volume as a direct parameter for tumor growth.

METHODS: Treatment of solid Ehrlich carcinoma by hyperthermia at 43 degrees C for 30 min for 3 successive days produced a 41.5% decrease in tumor volume, as well as a significant decrease in nucleic acids, protein contents and their rate of synthesis, in total lipids and cholesterol, and in acid-phosphatase and acid-ribonuclease. Chemotherapeutic management of the tumor by 5 mg/kg x 3 of cisplatin alone showed a continuous increase in tumor volume but at a lower rate than that of the untreated control. However, when cisplatin was given 1 h prior to hyperthermia, the tumor volume was significantly decreased by 82.6%.

RESULTS: The effects observed on all the investigated parameter were intensified when cisplatin was combined with hyperthermia. The results obtained suggest that hyperthermia may enhance the penetration of cisplatin to its target site inside the tumor cells due to a membrane-damaging effect. The enhanced lethality of cisplatin on tumor cells may also be due to the inhibition of DNA repair processes by hyperthermia.

Ahmed, M. M., M. T. Khayyal, and M. M. el-Merzabani, "Hyperthermic potentiation of cisplatin cytotoxicity on solid Ehrlich carcinoma.", Tumori, vol. 79, issue 4, pp. 268-72, 1993 Aug 31. Abstract

BACKGROUND: Hyperthermia produces marked effects on many biochemical parameters of tumor cells and has been reported to potentiate the effect of many drugs. We therefore evaluated the possible synergistic effect between hyperthermia and cisplatin against solid Ehrlich carcinoma. The study was based on the measurement of some biologic characteristics in tumor tissues, namely: DNA, RNA, and protein content and their rate of synthesis as parameters for nuclear damage; total lipids and cholesterol as parameters for membrane damage; acid-phosphatase and acid-ribonuclease as parameters for lysosomal damage; and tumor volume as a direct parameter for tumor growth.

METHODS: Treatment of solid Ehrlich carcinoma by hyperthermia at 43 degrees C for 30 min for 3 successive days produced a 41.5% decrease in tumor volume, as well as a significant decrease in nucleic acids, protein contents and their rate of synthesis, in total lipids and cholesterol, and in acid-phosphatase and acid-ribonuclease. Chemotherapeutic management of the tumor by 5 mg/kg x 3 of cisplatin alone showed a continuous increase in tumor volume but at a lower rate than that of the untreated control. However, when cisplatin was given 1 h prior to hyperthermia, the tumor volume was significantly decreased by 82.6%.

RESULTS: The effects observed on all the investigated parameter were intensified when cisplatin was combined with hyperthermia. The results obtained suggest that hyperthermia may enhance the penetration of cisplatin to its target site inside the tumor cells due to a membrane-damaging effect. The enhanced lethality of cisplatin on tumor cells may also be due to the inhibition of DNA repair processes by hyperthermia.

Parwani, A. V., H. A. Hussein, B. I. Rosen, A. Lucchelli, L. Navarro, and L. J. Saif, "Characterization of field strains of group A bovine rotaviruses by using polymerase chain reaction-generated G and P type-specific cDNA probes.", Journal of clinical microbiology, vol. 31, issue 8, pp. 2010-5, 1993 Aug. Abstract

Dot and Northern blot hybridization assays were used to analyze field strains of group A bovine rotaviruses (BRVs) by using nucleic acid probes representing P and G type specificities. The probes were prepared by polymerase chain reaction amplification of hyperdivergent regions of the cloned VP4 (nucleotides 211 to 686) and VP7 (nucleotides 51 to 392) genes from four serotypically distinct (in P or G types) strains of rotaviruses: NCDV (G6, P1), IND (G6, P5), 69M (G8, P10), and Cr (G10, P11). The P and G type cDNA probes were radiolabeled with [32P]dCTP and hybridized with RNA extracted from reference cell culture-passaged rotavirus strains or the field samples. The field samples were obtained from young diarrheic calves from Ohio, Nebraska, Washington State, and Canada. The cDNA probes were specific for their respective G or P types on the basis of analysis of known P and G type reference strains. The G typing analysis of 102 field samples revealed that 36.3% (37 of 102) were G6, 2.9% (3 of 102) were G8, 12.7% (13 of 102) were G10, and 23.5% (24 of 102) were untypeable. The P typing results for 93 samples indicated that 2.2% (2 of 93) were P1 (NCDV-like), 20.4% (19 of 93) were P5 (UK-like), 9.3% (10 of 93) were P11 (B223-like), and 40.8% (38 of 93) were untypeable. This is the first report of the identification among BRV strains in North America of a G type other than G6 or G10. Our report further confirms that G6, P5 rotaviruses are predominant among the BRV field strains that we examined, and the P types of these strains differ from that of the BRV vaccine strain used in the United States (G6, P1). The large number of untypeable G (23.5%) and P (40.8%) types suggests that other or new P and G types exist among BRV field strains.

Youssef, S. A., N. A. Afifi, A. Ramadan, and E. I. Ibrahim, "Comparative haemodynamic alterations induced by pipecuronium and pancuronium.", DTW. Deutsche tierarztliche Wochenschrift, vol. 100, issue 8, pp. 316-8, 1993 Aug. Abstract

Haemodynamic effects of pipecuronium bromide (Pi.) and pancuronium bromide (Pa.) were studied on isolated rabbit's heart, guinea pig's tracheal chain as well as the blood pressure in pentobarbital anaesthetized dogs. Pi. induced negative inotropic and chronotropic effects on the isolated rabbit's heart especially in lower concentrations. However, higher concentrations provoked two opposite effects, negative chronotropic and positive inotropic activity. In addition, Pa. in lower concentrations caused positive inotropic and negative chronotropic activity, while higher concentrations induced negative inotropic and chronotropic activity. Cardioinhibitory actions of both tested drugs are not due to either cholinergic or beta 1-adrenergic blocking effect but it may be due to nicotine-like activity. In anaesthetized dogs, i.v. injections of both tested drugs produced a transient decrease in systolic and diastolic pressure in doses above the therapeutic level. This effect may be referred to the partial ganglion blocking effect of both tested drugs.

El-Shafee, E., and G. R. Saad, "Dielectric analysis of poly(vinyl chloride) films doped with cobalt(II) chloride", Polymer Degradation and Stability, vol. 41, issue 1, pp. 25 - 29, 1993. AbstractWebsite

The dielectric behaviour of solution-grown thin films of poly(vinyl chloride) containing cobalt(II) chloride as dopant was investigated within the temperature range 20-120°C and a 1-100 kHz frequency band. When correction was made for a conduction effect at low frequency, a high-temperature glass-transition relaxation process was observed in addition to the ordinary glass-transition process of pure PVC. The former was thus considered to be a cluster-ionic transition process which might be due to a phase-separation behaviour. The effect of moisture uptake by the doped films on the electrical properties is discussed. © 1993.

Sayyouh, M. H., A. Dahab, M. S. Al-Blehed, and A. Hemeida, Effect of Drilling Fluids on Rock Wettability, , Riyadh, SA, Research Center of the College of Engineering. Report No.9/402, 1993.
Rizk, M. S., Y. M. Issa, M. A. Ahmed, and S. M. Shaaban, "Electrical and spectrophotometric properties of charge transfer complexes of picric acid and some aniline derivatives", Journal of Materials Science: Materials in Electronics, vol. 4, issue 2: Kluwer Academic Publishers, pp. 109 - 112, 1993. AbstractWebsite

The charge transfer complexes produced by the reaction between picric acid and some aniline derivatives were prepared. The prepared charge transfer complexes (CTC) were investigated using infrared and nuclear magnetic resonance spectroscopy aiming to throw more light on their molecular structure. It was proved that a proton transfer interaction takes place between PiOH and x-Ph.NH2 leading to the formation of PiO} and x-Ph.NH3+ ions. The normal π-π1 electronic interaction takes place by transferring an electron from the aniline ring to the picric acid. The semiconducting properties of the CTC were investigated. All the prepared complexes were proved to have a semiconducting character within the temperature range investigated. © 1993 Chapman & Hall.

Nessim, R. I., M. G. Botros, G. R. Saad, and M. M. Shalaby, "Frequency dependence of the complex dielectric constant of sodium carboxymethyl cellulose", Die Angewandte Makromolekulare Chemie, vol. 204, issue 1, pp. 51 - 61, 1993. AbstractWebsite

The dielectric constant, ε′, and dielectric loss, ε″, were determined for three solid carboxymethyl cellulose samples having different levels of substitution and different degrees of polymerization over a frequency range of 0.1 – 10 000 kHz at temperatures from 10–60°C. In contrast to the two relaxation processes, γ and β, previously observed in native cotton cellulose, only one relaxation process within a frequency range of 0.1 – 1 kHz was identified. It was found that the dielectric properties do not only depend on the degree of substitution, but also on the weight‐average degree of polymerization and uniformity of distribution. © 1993 Hüthig & Wepf Verlag, Basel

Khayyal, M. T., A. S. el-Khatib, M. El-Ghazaly, and A. Hatem, "Inhibition of leukotriene release by mofebutazone: a possible clinical advantage.", International journal of clinical pharmacology research, vol. 13, issue 5, pp. 255-61, 1993. Abstract

The isolated perfused lung preparation from actively sensitized guinea-pigs was used; after it was challenged with antigen, mediators such as histamine, prostaglandins and leukotrienes were released into the lung effluent. It was found that treatment of the perfused lungs before and during challenge with mofebutazone (10 micrograms/ml) inhibited the immunological release of prostaglandins as well as leukotrienes. Phenylbutazone, on the other hand, at the same dose level inhibited the release of prostaglandins, whereas the release of leukotrienes was much less affected by the drug. Histamine release was not altered by either drug. When clinically mofebutazone tablets (300 mg) were given as an analgesic twice daily for 15 days to a number of asthmatic volunteers including 3 aspirin-sensitive individuals, there was no increase in the incidence or intensity of the asthmatic attacks, even in the aspirin-sensitive patients. Pulmonary ventilatory functions which showed a certain obstructive pattern were not worsened by the treatment and even tended to be somewhat improved.

Khayyal, M. T., A. S. el-Khatib, M. El-Ghazaly, and A. Hatem, "Inhibition of leukotriene release by mofebutazone: a possible clinical advantage.", International journal of clinical pharmacology research, vol. 13, issue 5, pp. 255-61, 1993. Abstract

The isolated perfused lung preparation from actively sensitized guinea-pigs was used; after it was challenged with antigen, mediators such as histamine, prostaglandins and leukotrienes were released into the lung effluent. It was found that treatment of the perfused lungs before and during challenge with mofebutazone (10 micrograms/ml) inhibited the immunological release of prostaglandins as well as leukotrienes. Phenylbutazone, on the other hand, at the same dose level inhibited the release of prostaglandins, whereas the release of leukotrienes was much less affected by the drug. Histamine release was not altered by either drug. When clinically mofebutazone tablets (300 mg) were given as an analgesic twice daily for 15 days to a number of asthmatic volunteers including 3 aspirin-sensitive individuals, there was no increase in the incidence or intensity of the asthmatic attacks, even in the aspirin-sensitive patients. Pulmonary ventilatory functions which showed a certain obstructive pattern were not worsened by the treatment and even tended to be somewhat improved.

Mohamed, A. Z., S. S. Saleem, M. A. El-Ghandour, and M. A. Ahmed, "Magnetic susceptibility of the two-dimensional Cu2+ complex", Journal of Materials Science, vol. 28, issue 5: Kluwer Academic Publishers, pp. 1289 - 1292, 1993. AbstractWebsite

The magnetic susceptibility behaviour of (m-NO2-C6H4NH3)2 M Cl4-xBrx compounds, where M is Cu2+ and x=0, 1, 2, were studied in the temperature range 300-390 K. The effective magnetic moment, Curie constant and Curie-Weiss constant for Cu2+ were calculated. In addition, the effect of replacing Cl-1 by Br-1 ions in the compounds was studied. Differential scanning calorimeter thermographs were used to check the phase-transition points. © 1993 Chapman & Hall.

Khayyal, M. T., M. A. El-Ghazaly, and A. S. el-Khatib, "Mechanisms involved in the antiinflammatory effect of propolis extract.", Drugs under experimental and clinical research, vol. 19, issue 5, pp. 197-203, 1993. Abstract

Propolis is a natural product produced by the honey bee. The extract contains amino acids, flavanoids, terpenes and cinnamic acid derivatives. In various in vitro models propolis extract was shown to inhibit platelet aggregation and to inhibit eicosanoid synthesis, suggesting that it might have potent antiinflammatory properties. A 13% aqueous extract was tested orally in three dose levels (1, 5 and 10 ml/kg) on the carrageenan rat paw oedema model and on adjuvant-induced arthritis in rats. In both models, the extract showed potent dose-related antiinflammatory activity, which compared well with that of diclofenac (as a reference standard). The extract was then tested on an isolated sensitized guinea pig lung preparation to study its effect on the release of prostaglandins, leukotrienes and histamine. It is concluded that propolis extract has potent antiinflammatory properties in vivo. Its activity can be well correlated with its effects on the release of various mediators of inflammation.

Khayyal, M. T., M. A. El-Ghazaly, and A. S. el-Khatib, "Mechanisms involved in the antiinflammatory effect of propolis extract.", Drugs under experimental and clinical research, vol. 19, issue 5, pp. 197-203, 1993. Abstract

Propolis is a natural product produced by the honey bee. The extract contains amino acids, flavanoids, terpenes and cinnamic acid derivatives. In various in vitro models propolis extract was shown to inhibit platelet aggregation and to inhibit eicosanoid synthesis, suggesting that it might have potent antiinflammatory properties. A 13% aqueous extract was tested orally in three dose levels (1, 5 and 10 ml/kg) on the carrageenan rat paw oedema model and on adjuvant-induced arthritis in rats. In both models, the extract showed potent dose-related antiinflammatory activity, which compared well with that of diclofenac (as a reference standard). The extract was then tested on an isolated sensitized guinea pig lung preparation to study its effect on the release of prostaglandins, leukotrienes and histamine. It is concluded that propolis extract has potent antiinflammatory properties in vivo. Its activity can be well correlated with its effects on the release of various mediators of inflammation.

El-Zeany, B. A., A. A. Moustafa, M. Abdelkawy, and M. F. Abdelghany, Simultaneous Spectrophotometric Determination of Papaverine Hydrochloride in Presence of Diphylline in Pharmaceutical Preparations, , vol. 31, issue 1, pp. 5 - 9, 1993. Abstract
n/a
M., K., "The Contribution of Computer Modeling Languages to Operations Research Methodology: A Comparative Analysis", The 28th Annual Conference for Statistics, Computer Science and Operations Research, CairoUniversity, , 18-20 Dec, 1993.
Abdel-Malak, M. G., G. Abdel-Malak, A. Abdel-Azeez, A. A. Farahat, and M. S. S. Abdou, "Viability of frozen buffalo semen in Tris-yolk-fructose extender", 5th Ann. Congr. Egyptian Soc. Anim. Reprod. Fert., 171, 1993.
Afifi, R. Y., P. Graham, S. Humphreys, and B. M, "Evaluation of oestrogen receptor immunohistochemical techniques in paraffin embedded tissue", 11th Annual meeting of the Egyptian Society of Surgeons, Cairo, 10 February, 1993.
Tourism