A microbial contamination of several primary schools (official and private) in
Baghdad city was conducted. Sampling was performed in each school from desk,
door handle, and hand of students.
Out of 113swabs (classes desk, door holder, and students hands ) obtained from
ten primary schools, growth wasobserved in 91 samples (80.5%) (for official
school 84.6% and 71.4 for private school.
The results of recent study revealed that the official schools showed higher
contamination levels(130 CFU ) than private ones (90 CFU).
Resultes revealed that a total of 12 morphologically different bacterial species
were isolated from 62 bacterial isolates,among which gram negative bacteria 40
isolates(64.5%) were higher than gram-positive bacteria 22 isolates( 35.4%).
According to the microscopic examination , biochemical tests and API system ,
the results was showed that staphylococcus epidermidis was the most frequently
isolated bacterial species with recovery rate 10 (16 .1%). followed by
staphylococcus aureus 8 ( 12.9 %) Escherichia spp7 (11.2%) Escherichia coli7
(11.2%), Enterobacter sakazaki 5(8%), Enterobacter cloacae 5 (8%), Bacillus spp
5(8%), Pseudomonas aeruginosa 4(6.45%), Klebsiella spp 4(6.45%), Klebsiella
pneumoniae 3(4.8%), Streptocoocus spp 3(4.8%), Proteus mirabilis 1(1.6%).
Investigation of Microbial Contamination of Primary Schools in Baghdad City
Primary Schools
Bacteria
Contamination
Publication Date
Tue Jan 18 2022
Journal Name
Materials Science Forum
The Effect of Gamma Radiation on the Manufactured HgBa<sub>2</sub>Ca<sub>2</sub>Cu<sub>2.4</sub>Ag<sub>0.6</sub>O<sub>8+δ</sub> Compound
Gamma doses radiation
crystal size
strain
degree of crystallinity
Scherrer
crystallinity and Williamson equations.
In this article four samples of HgBa2Ca2Cu2.4Ag0.6O8+δ were prepared and irradiated with different doses of gamma radiation 6, 8 and 10 Mrad. The effects of gamma irradiation on structure of HgBa2Ca2Cu2.4Ag0.6O8+δ samples were characterized using X-ray diffraction. It was concluded that there effect on structure by gamma irradiation. Scherrer, crystallization, and Williamson equations were applied based on the X-ray diffraction diagram and for all gamma doses, to calculate crystal size, strain, and degree of crystallinity. I
... Show More
(2)
(2)
