Numerical solution of COVID-19 pandemic model via finite difference and meshless techniques.

In the present paper, a reaction-diffusion epidemic mathematical model is proposed for analysis of the transmission mechanism of the novel coronavirus disease 2019 (COVID-19). The mathematical model contains six-time and space-dependent classes, namely; Susceptible, Exposed, Asymptomatically infected, Symptomatic infected, Quarantine, and Recovered or Removed (SEQIIR). The threshold number R is calculated by utilizing the next-generation matrix approach.

Perceptions of COVID-19-related Risks and Deaths Among Health Care Professionals During COVID-19 Pandemic in Pakistan: A Cross-sectional Study.

COVID-19 is an established challenge to the health care professionals (HCPs) having physical, emotional, and psychological repercussions. We determine the perceptions of Pakistani HCPs regarding the risks and deaths related to COVID-19. A cross-sectional study was conducted among HCPs throughout Pakistan from 16th February 2021 to 6th March 2021 by disseminating an online Google questionnaire via all possible social media platforms including WhatsApp, Facebook, Twitter, and emails.

Modelling the impacts of climate change on riverine thermal regimes in western Canada's largest Pacific watershed.

Quantification of climate change impacts on the thermal regimes of rivers in British Columbia (BC) is crucial given their importance to aquatic ecosystems. Using the Air2Stream model, we investigate the impact of both air temperature and streamflow changes on river water temperatures from 1950 to 2015 across BC's 234,000 km Fraser River Basin (FRB). Model results show the FRB's summer water temperatures rose by nearly 1.

Impacts of a Rapidly Declining Mountain Snowpack on Streamflow Timing in Canada's Fraser River Basin.

With its headwaters in the water towers of the western Cordillera of North America, the Fraser River is one of the continent's mightiest rivers by annual flows, supplies vital freshwater resources to populous downstream locations, and sustains the world's largest stocks of sockeye salmon along with four other salmon species. Here we show the Variable Infiltration Capacity (VIC) model's ability to reproduce accurately observed trends in daily streamflow for the Fraser River's main stem and six of its major tributaries over 1949-2006 when air temperatures rose by 1.4 °C while annual precipitation amounts remained stable.

Structural studies on a carbohydrate chain isolated from the lipopolysaccharide of Shigella boydii type 8.

The lipopolysaccharide isolated from the cells of Shigella boydii type 8 bacteria gave precipitin bands against homologous antisera on Ouchterlony plates, whereas the carbohydrate-containing fractions obtained from it did not. One of the fractions was obtained in major proportion and contained 23.5% of sugars.