Applied Science Private University

About: Applied Science Private University is a education organization based out in Amman, Jordan. It is known for research contribution in the topics: Catalysis & Population. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

The effect of route of administration in thymoquinone toxicity in male and female rats.

Abstract: The maximum tolerated dose for intraperitoneal injection and oral ingestion of thymoquinone was determined in male and female Wistar rats. A range of dose levels of thymoquinone: 20, 30 and 40 mg/kg body weight for intraperitoneal injection and 200, 300 and 500 mg/kg body weight for oral ingestion were tested for acute toxicity in rats. The results showed that the maximum tolerated dose for intraperitoneal injection was 22.5 mg/kg in male rats and 15 mg/kg in females, whereas for oral ingestion it was 250 mg/kg in both male and female rats. There were different signs of toxicity shown in rats which received intraperitoneal injection from those that received oral ingestion of thymoquinone. Rats which received intraperitoneal injection of thymoquinone showed toxicity signs which were related to acute pancreatitis. Meanwhile, rats which received oral ingestion of thymoquinone showed transient toxicity signs. Two deaths were reported at dose of 500 mg/kg as a result of bowel obstruction complications. The data presented in this study indicate that the route of administration of thymoquinone could have an influence on thymoquinone toxicity outcome in both genders.

An experimental study of saturable absorbers for ruby lasers

Abstract: This paper presents the results of a study of the behavior of some saturable dye filters used with ruby lasers. We review some apparently contradictory results obtained earlier and present modified forms of energy level models, which are consistent with the known photophysical properties of the molecules. We then present experimental evidence to elucidate the nature of the overall relaxation time, the source of the residual absorption, and the nature of the transient spectral hole burning, which gives rise to frequency-locking between different lasers. On the basis of the frequency-locking experiments, and our model, it is possible to calculate the rate at which the broad molecular absorption band couples into the narrow spectral width of the radiation field during pumping. This time is of the order of 5 \times 10^{-12} second for chloro-aluminum phthalocyanine in pyridine. Taking into account considerations such as excited-state absorption, mode of bleaching, etc., we conclude that the phthalocyanine dyes are best suited as saturable absorbers at low power levels (<5 MW/cm2but are unsuited for mode-locking applications. Cryptocyanine has lower residual losses above 10 MW/cm2and can be used for mode locking. Both types of dye exhibit very narrow spectral hole burning, which can be used to frequency-lock separate lasers.

Synthesis and properties of a copper selective chelating resin containing a salicylaldoxime group

Abstract: A chelating ion-exchange phenol-formaldehyde polymer, poly(salicylaldoxime 3,5-diylmethylene) was synthesized and characterized. The sorption properties of the chelate-forming resin towards various divalent ions (Mg 2+ , Ca 2+ , Ni 2+ , Cu 2+ , Zn 2+ and Cd 2+ ) were studied by a static batch equilibration technique as a function of pH and contact time. The resin exhibited high selectivity towards Cu 2+ ions and showed fast rates of metal ion uptake, particularly for Cu 2+ which experienced >90% uptake in less than 1 h. In a dynamic column operation, it was demonstrated that the resin can be used for effective removal of copper ions from aqueous solutions.