No abstract

This study assessed the efficiency of activated carbon, cement kiln dust (CKD), and sawdust for the removal of cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) from aqueous solutions under mono-metal and competitive sorption systems and the removal of Cd, Cu, and Zn from different industrial wastewaters. Batch equilibrium experiments were conducted in a mono-metal and competitive sorption system. The efficiency of the sorbents in the removal of Cd, Cu, and Zn from industrial wastewaters was also investigated. Cement kiln dust expressed the highest affinity for the metals followed by activated carbon and sawdust. Competition among the metals changed their distribution coefficient (Kd) with the sorbents. Sorption of Pb and Cu was higher than Cd and Zn. The average metal removal from the wastewaters varied from 74, 61, and 60% for Cd, Cu, and Zn, respectively, to nearly 100%. The efficiencies of CKD and activated carbon in removing metals were higher than sawdust, suggesting their potential as low-cost sorbents for the removal of toxic metals from wastewaters.

Purpose: This study was conducted to evaluate bone height around ball and socket and equator attachment in mandibular overdenture retained by single implant. Material and methods: Ten completely edentulous patients were selected with ages ranging from 50-60 years. Single implant was inserted for each patient and they all received heat cured acrylic dentures. The ten patients were divided into two groups, group (I) have received ball &socket attachment, group (II) received equator attachment. In the fitting surface of the lower denture two holes where made between 6 and 7 acrylic teeth and were filled with radioopaque material (amalgam). These represented posterior marker areas of evaluation the bone height. Evaluation of bone height around the implant and the posterior edentulous area which were marked for measurement was done by CAD_CAM CT at the time of attachment placement then after 3 months then 6 months. Results: In our study the comparison of equator and ball and socket attachments regarding the bone height changes around the implant revealed a significant difference. On the other hand there was an insignificant difference when comparing the distal extension area between them throughout the six months studies period. Conclusion: According to this study the equator attachment group indicates lesser marginal bone loss, as compared with the ball and socket attachment group, and there is no difference in bone resorption on the posterior area of the ridge between the two attachments.

This work was conducted to survey and know distribution of some wild bird species at Gharbia Governorate during two successive years (2012)(2013)(2014). Twenty four bird species were recorded as resident birds were classified to fourteen as harmful bird species and 10 species were recorded as beneficial birds. These species were existed around the year. Five bird species as migratory bird species recorded during the study period were as follow, four species were recorded as harmful birds and one species was recorded as beneficial bird species.

Purpose: The aim of this study was to evaluate the effect of occlusion and two different denture base material on muscle activity and masticatory efficiency of complete dentures. Material and Methods: Two complete dentures of different material, conventional and flexible denture base material with different occlusal schemes, starting with unbalanced occlusion and converted into bilateral balanced occlusion through three different ways of remounting, laboratory, clinical and intra-oral selective grinding applied on three different posterior teeth assemblies were delivered to patients who were totally edentulous (all were men range age 50-60 years). Muscle activity and masticatory efficiency were evaluated with two different type of food, carrots resembling hard food and banana resembling soft food. The occlusal schemes were switched on the patients' denture bases. Two-way repeated-measures ANOVA and t test were used to examine the alterations between the occlusal schemes, denture base materials and chewing strokes and their relations. Results: No significant difference was found in electromyographic activity or masticatory efficiency between the occlusal schemes and denture base materials with soft food (p<0.05). A significant difference was found in electromyographic activity and masticatory efficiency with bilateral balanced occlusion obtained through clinical remounting with flexible denture base material with hard food. Conclusions: Within the limitation of this study, it was concluded that complete dentures with bilateral balanced occlusion obtained through clinical remounting found significant differences in muscle activity and masticatory efficiency with hard food. Flexible dentures are better than conventional dentures in muscle activity and masticatory efficiency.