جستجوی مقالات مرتبط با کلیدواژه "biological aerosols" در نشریات گروه "پزشکی"

The presence of biological aerosols in the air of medical centers is more than other enclosed spaces. Determining the role and importance of such factors has always attracted the attention of health and medical researchers. This study aimed to evaluate the bacterial density of surgical and infectious wards in two important hospitals of Kermanshah and environmental factors affecting them.
In this study, a total of 160 samples were selected. One hundred and twenty eight samples were related to the air of surgical and infectious wards in two stages before and after disinfection of wards and 32 samples were related to the hospital outdoor air as the control sample. MCS Flite (SKC) air sampling pump was equipped with a Biostage 225 (SKC) microbial sampling cassette made in the USA. Data were analyzed with SPSS 19.
The highest bacterial density in the air was measured in Imam Khomeini Hospital (402.7± 200.3 CFU/m3) and the lowest was in Imam Reza Hospital (258.6 ± 90.5 CFU/m3). There was a significant inverse relationship between air temperature and total bacterial density and a significant direct relationship between the whole population and bacterial density.
It seems that reduced bacterial density in wards’ air with increased temperature occurs due to increasing the air volume and replacing air in wards. The presence of people in the ward plays an important role in increased bacterial density.

Biological aerosol term refers to airborne particles of biological origin, and includes a diverse range of microorganisms and living organisms. One of the major concerns associated with composting facilities is reproduction and distribution of biological aerosols in considerable quantities. The aim of this study was to determine the bioaerosols concentrations of the various units of the Tehran's Kahrizak compost plant and compare with standard concentrations. In this study, the total bacteria, Gramnegative bacteria and the fungus Aspergillus fumigatus in different parts of the plant using the direct method of sampling was tested. Sampling was performed during one month in four week of the field, separation unit, screening unit, mass windrow, 10 meters high (upwind) and lower mass windrow (wind direction). The results of this study showed that the number of microorganisms in the field for total bacteria and gram-negative bacteria was respectively 791 to 1785 and from 12 to 135 CFU / m3 and for the fungus Aspergillus fumigatus 710 to 1000 CFU / m3. In samples taken from different processes to produce compost was reported the total bacteria and gram-negative bacteria was respectively, from 1250 to 2948 and 22 to 304 CFU / m3 and fungus Aspergillus fumigatus 796 to 1850 CFU / m3. The results of this study show that the biological aerosols from composting facilities units are further than the ASTM standards. This subject is remarkable in screening and separation units.