in order to optimize sludge depth in sand drying beds under the climatic conditions of saudi arabia, the effect of initial sludge depth on the fate of pathogens was investigated.the investigation was carried out for one year in al-khobar wastewater treatment plant, where initial sludge depths of 10, 15, 20, 25, 30 and 35 cm were implemented. sludge samples were collected on 0, 1, 2, 4, 7, 14, a...

sexually transmitted diseases (std) are a significant problem in canada and have many personal and financial effects on the society. stds are very prevalent in adults and adolescents who are very sexually active. women are more affected by these diseases and after many years, appear in the shape of infertility, ectopic pregnancy, and cervical cancer. majority of women never know about her infec...

results the results of this study indicated that the overall hepatitis b vaccine acceptance rate was acceptably high. among all, 53.5% correctly identified that a vaccine to prevent hepatitis b virus infection had been available, 15% had a negative opinion, and 31.5% were neutral. the rations of all three doses of vaccination were 69.3%. conclusions among the respondents, 87% were currently mar...

Electron microscopy has proved to be a very helpful those at posterior end consisting of powerful adhesive instrument in the study of biology in general. Since it has disks usually provided with chitinoid hooks or anchors; been invented a lot of information has accumulated in with single host, parasites of cold-blooded aquatic different aspects of biology. Studying the ultrastructure vertebrate...

background : people with sexually transmitted infections (stis) constitute the high-risk group for transmission of hiv. the present study was planned to estimate the prevalence of hiv and syphilis in patients attending sti clinic and to assess the socio-demographic determinants of the study subjects. methods : a cross sectional descriptive study of three-month duration was undertaken from janua...