Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of c...Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of chalkbrood disease of bees, Ascophaera apis. The extract showed considerable activity against all these fungi. One of the main constituents ofRumex cyprius was isolated and tested for its antimycotic activity. It showed a significant activity against the test fungi and was identified as 1,3,8-trihydroxy-6-methylanthracene-9,10-dione based on its IR, UV-V and 1^H NMR spectra.展开更多
Tall buildings in cold climates have unique challenges in maintaining indoor air quality due to stack effect.During the heating season,interior air buoyancy creates large pressure differentials in vertical shafts that...Tall buildings in cold climates have unique challenges in maintaining indoor air quality due to stack effect.During the heating season,interior air buoyancy creates large pressure differentials in vertical shafts that can drive airflow from lower floors into upper floors.This pressure differential can result in the spread of contaminants throughout a building.Most recently,concern over COVID-19 has increased attention to the potential spread of airborne diseases in densely populated buildings.For many multi-unit residential buildings,suite ventilation has traditionally relied upon fresh air supplied through a mechanically pressurized corridor.In cold climates,large pressure differentials created by stack-effect can reduce the effectiveness of this approach.Multizone and CFD simulations are employed to analyze airflow and contaminant spread due to stack effect.Simulations are conducted on an idealized model of a 10-storey building using a range of experimentally derived airtightness parameters.Simulations demonstrate stack effect can reduce corridor ventilation to suites and even reverse the airflow for leakier buildings.Reduced airflow to suites can result in the accumulation of contaminants.Reversal of the airflow can allow contaminants from a suite to spread throughout the building.Contaminant spread is illustrated as a function of mechanical ventilation,building airtightness,and ambient temperatures.Strategies to reduce the influence of stack effect on mechanically pressurized corridors are discussed.展开更多
文摘Ethanolic extract of dried Rumex cyprius Murb （polygonaceae） was tested against four pathogenic fungi： three dermatophytes, Microsporum canis, Trichophyton mentagrophytes and T. rubrum, and the causative agent of chalkbrood disease of bees, Ascophaera apis. The extract showed considerable activity against all these fungi. One of the main constituents ofRumex cyprius was isolated and tested for its antimycotic activity. It showed a significant activity against the test fungi and was identified as 1,3,8-trihydroxy-6-methylanthracene-9,10-dione based on its IR, UV-V and 1^H NMR spectra.
基金supported by the Natural Sciences and Engineering Research Council of Canada[NSERC DG 2016-04176].
文摘Tall buildings in cold climates have unique challenges in maintaining indoor air quality due to stack effect.During the heating season,interior air buoyancy creates large pressure differentials in vertical shafts that can drive airflow from lower floors into upper floors.This pressure differential can result in the spread of contaminants throughout a building.Most recently,concern over COVID-19 has increased attention to the potential spread of airborne diseases in densely populated buildings.For many multi-unit residential buildings,suite ventilation has traditionally relied upon fresh air supplied through a mechanically pressurized corridor.In cold climates,large pressure differentials created by stack-effect can reduce the effectiveness of this approach.Multizone and CFD simulations are employed to analyze airflow and contaminant spread due to stack effect.Simulations are conducted on an idealized model of a 10-storey building using a range of experimentally derived airtightness parameters.Simulations demonstrate stack effect can reduce corridor ventilation to suites and even reverse the airflow for leakier buildings.Reduced airflow to suites can result in the accumulation of contaminants.Reversal of the airflow can allow contaminants from a suite to spread throughout the building.Contaminant spread is illustrated as a function of mechanical ventilation,building airtightness,and ambient temperatures.Strategies to reduce the influence of stack effect on mechanically pressurized corridors are discussed.
