Grafting on high alpha-cellulose pulp extracted from sunflower stalks for removal of Hg [II] from aqueous solution

Dissolving pulp containing 95.5% a-cellulose was extracted from sunflower stalks. The pulped sunflower stalks [PSFS] were used as starting material for grafting with acrylamide [Aam]. All factors affecting the grafting reaction were examined. These factors include, liquor ratio [L.R], ceric ammonium nitrate [CAN] concentration as a catalyst, Aam concentration as well as reaction time and temperature. The grafted PSFS [GPSFS] samples were chracterized by estimation of nitrogen%. The optimum conditions for grafting are, PSFS, Ig; L.R, 1:15; CAN, 20mmole/l; Aam, Ig; Temp., 60°C and time 3hr. The GPSFS was utilized as adsorbent material to remove Hg [II] ions from aqueous solutions. All. factors affecting adsorption process were examined. These factors include, pH, adsobent concentation, temperature and agitation time. The adsorption data show that, the maximum adsorption capacity, q,, of Hg [II] onto GPSFS is 625mg/g. The adsorption data also showed that the adsorption of Hg [II] onto GPSFS obeys Langmuir and Freundlish isotherms

Comparison of tooth size and arch dimensions for two ethenic groups

Comparative study of arch dimensions and tooth size was done to compare between Kuwaity and Egyptian young adults with acceptable occlusion. Their average age was 18-25 years. Measurements were taken on plaster casts of the dental arches. The number of individuals involved in this study was/100 Kuwaity [50 males and 50 females] and 200 Egyptian [100 males and 100 females]. From this study the findings reveal that the Kuwaity and Egyptian young adults are different from each other in all measurements

prediction of the size of unerupted canines and premolars in Kuwaity contemporary population

Linear regression equations for the prediction of mesiodistal widths of unerupted canines and premolars were calculated for the Kuwaity population. Orthodontic models of 100 young adult Kuwaity individuals with equal sexes, and age ranging from 18-25 years. All subjects were selected from the out patient clinic of Kuwait Dental Center. These subjects are characterized by: normal occlusal relation, no history of previous orthodontic treatment, no crowding or spacing of the teeth and no fractures or proximal carious cavities. The calculated linear regresion cofficients for Kuwaity population were 12.17 for maxilla and 12.45 for the mandible. Prediction tables were calculated to be used for arch length analysis in mixed dentition of Kuwaity population