This paper aims to evaluates different opinions to understand what tourist guides of South Africa would like to change about their guiding profession, addresses the challenges they face and what tourist guides should be expected to do.A non-random sample of 320 tourist guides was selected to participate in the study.Both qualitative and quantitativ
The protocol outlined represents a cost-effective, rapid and reliable method for the generation of high-titre viral pseudotype particles with the wild-type SARS-CoV spike protein on a lentiviral vector core using the widely available transfection Kits reagent PEI.This protocol is optimized for transfection in 6-well plates; however it can be readil
<List> <ListItem><ItemContent><p>● Impacts of 30 cropping systems practiced on the North China Plain were evaluated.</p></ItemContent></ListItem> <ListItem><ItemContent><p>● Trade-offs were assessed among productive, economic and environmental indicators.</p></ItemContent>&
As an ingenious concept which broadens the traditional Adidas Cotton T-Shirt error-feedback mechanism, the principle of self-support (PSS) is reviewed in this article with two extensions.Instead of regarding a control signal as an input variable or a cause of the control processes, PSS emphasized the independence and significance of the control sig