ABSTRACT
Hearing loss [deafness] is a disability that is often over looked because it is not obvious. This study investigates oral health care status and behaviors between two groups of hearing and deaf and hard-of-hearing [D and HH] adolescents in Tehran in 1385. A hundred and ninety two [D and HH] students [87 females, 105 males] attending special nonresidential public schools and 193 hearing students [87 females, 106 males] attending regular public schools from all areas of Tehran, ages 12-16 years answered a written questionnaire about frequency of dental visits, reason and time of last dental visit, frequency and time of brushing. Information about DMFT was obtained through oral examination. Chi-square and T tests were used for statistical analysis and p=0.001 was considered significant. Significant differences existed between hearing and D and HH group from different states. The hearing group had more dental visits and frequency of tooth brushing than D and HH group [P=0] and [P=0.002] respectively. Mean DMFT score in hearing and D and HH adolescents was 3.13 [SD=2.852] and 3.37 [SD=3.034] respectively. The MT score in D and HH and hearing adolescents was 0.16 [SD=0.474] and 0.04 [SD=0.273] respectively which was significantly higher than hearing group [P=0/006]. There was no significant difference between mean DMFT score of the two groups [P=0.116]. Three findings of concern are the higher rate of Extracted teeth, less dental visits and tendency of tooth brushing by D and HH adolescents. The oral health care knowledge and practices of D and HH adolescents will improve through a controlled school-based oral health education program
ABSTRACT
Bioremediation of metal pollutants from industrial wastewater using metal resistant bacteria is a very important aspect of environmental biotechnology. In this study, three species of Pseudomonas aeruginosa were isolated from active sludge of a food factory in the city of Kerman. The bacterial identity was determined by various biochemical tests. Among them, isolate number one could grow on Muller-Hinton agar medium containing 6mM cadmium ion [Cd[2+]] and was therefore selected for further study. The isolates were subjected to mutation by two mutagenic agents [Acridine Orange and Acriflavine] using gradient plate and SIC techniques. The Minimum Inhibitory Concentration of Cd[2+] for the isolate one after mutation was increased to 7mM. Removal of Cd[2+] using mutated and wild type strains of this bacterium was carried out at different time intervals [10-300 minutes]. It was observed that within 60 minutes, 94.7% of cadmium was removed in 30mg/L of Cd[2+] solution. However, with 60mg/L Cd[2+] solution, only 53.58% and 38.68% Cd[2+] removed were achieved by mutated and wild type bacteria, respectively. The equilibrium data was fitted by Langmuir isotherm equation and the related parameters for Cd[+2] were derived. Based on the data obtained in this study, it can be concluded that biomass of this bacterium can be used for bioremediation of cadmium from industrial waste processing plants with high efficiency