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Functional relationship between ammonia-oxidizing bacteria and ammonia-oxidizing archaea populations in the secondary treatment system of a full-scale municipal wastewater treatment plant

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Journal of Environmental Sciences 2019年第12期31卷 120-130页

作者： Golam MIslam Peter Vi kimberley ann gilbride Department of Chemistry and Biology Ryerson University350 Victoria StreetTorontoOntario M5B 2K3Canada Ryerson Urban Water Ryerson University350 Victoria StreetTorontoOntario M5B 2K3Canada

The abundance of ammonia-oxidizing bacteria and archaea and their amo A genes from the aerobic activated sludge tanks,recycled sludge and anaerobic digesters of a full-scale wastewater treatment plant(WWTP)was *** chain reaction and denaturing gradient gel electrophoresis were used to generate diversity profiles,which showed that each population had a consistent profile although the abundance of individual members *** the aerobic tanks,the ammonia-oxidizing bacterial(AOB)population was more than 350 times more abundant than the ammonia-oxidizing archaeal(AOA)population,however in the digesters,the AOA population was more than 10 times more *** the activity of the amo A gene expression of the two populations using RT-PCR also showed that the AOA amo A gene was more active in the digesters than in the activated sludge *** batch reactors and dd PCR,amo A activity could be measured and it was found that when the AOB amo A activity was inhibited in the anoxic reactors,the expression of the AOA amo A gene increased *** suggests that these two populations may have a cooperative relationship for the oxidation of ammonia.

关键词： Wastewater treatment Topic:Ammonia-oxidation Ammonia-oxidizing bacteria(AOB) Ammonia-oxidizing archaea(AOA) PCR Digital droplet polymerase chain reaction(ddPCR)

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Determinants of nurse faculty intention to remain employed

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Open Journal of Nursing 2012年第3期2卷 254-261页

作者： ann E. Tourangeau Heather Thomson Margaret Saari kimberley Widger Era Mae Ferron Kathleen MacMillan Lawrence S. Bloomberg Faculty of Nursing University of Toronto Toronto Canada School of Health Sciences Humber College Toronto Canada

Shortage of nurses is a major concern across healthcare systems. One contributing factor that has received little attention is the shortage of adequately prepared nurse faculty. The nurse shortage will be exacerbated if the supply of adequately prepared nurse faculty is insufficient. Little is known about the factors that influence nurse faculty to remain employed. Focus groups were conducted in 2011 with nurse faculty from both colleges and universities in Ontario, Canada. Six focus groups including 37 participants were held with different groups of nurse faculty in geographically diverse areas of the province. Focus group transcripts were reviewed by five members of the research team using thematic analysis strategies to identify factors related to nurse faculty intention to remain employed. Nurse faculty members’ intention to remain employed was influenced by factors that fell into four thematic categories: personal characteristics, work environment and organizational support, job content, and external characteristics. Each thematic category includes several factors reported to influence nurse faculty intention to remain employed. The “Determinants of Nurse Faculty Intention to Remain Employed” Model is hypothesized. Strategies to address modifiable factors and support non-modifiable factors are suggested to promote retention of nurse faculty. Additional research is needed to test the hypothesized model of nurse faculty intention to remain employed.

关键词： Nurse Faculty Retention Work Environment Organizational Support Theory Development Focus Groups Nursing Workforce

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