The choice of the formula for standard deviation is explained in elementary statistics textbooks in various ways. We give an explanation for this formula by representing the data as a vector in $\mathbb R^n$ and considering its distance from a central tendency vector. In this setting the "sta...
Thin Layer Chromatography:This is almost the same to paper chromatography, except for the different phases used here. Instead of soaked paper, this one utilises alumina or silica-coated sheet, which is made of glass or plastic. The absorbent’s spots can be seen on the sheet after the proce...
This chapter asks and then answers ‘What is our purpose?’ for student learning, for teaching and for the book itself. It elaborates the need for, and the possibility of, a coherent solution to the problems associated with an education in which all the parts are not well connected. You ...
6BA has the characteristics of high efficiency, stability, low cost, and ease of use, making it widely adopted and a favorite cytokinin for tissue culture. The main function of BA is to promote bud formation and induce callus tissue formation. It can be used to improve the quality and yield...
1. Overview DL-Dithiothreitol (Dithiothreitol, DTT for short) is a small molecule organic reducing agent with the chemical formula C4H10O2S2. It is a..
Non-point source pollution is a serious environmental issue and has attracted a lot of scientific attention. Currently, the influences of grazing on the water and nutrient cycles in alpine meadows, as well as corresponding underlying mechanisms, still remain unclear. The quantitative contributions of ...
SiO2 Mean corrected Intesity: 12345.4 Std. Dev.: 0.306 Sample conc.: 21.40 mg/L RSD: 1.43% Is it possible for someone to explain to me how to do this because I might have to do similar Silicon/Silica problems in the next few weeks. Thank you for your help....
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2. The structural basis for helicase translocation, directionality, and unwinding 3. The nidovirus helicase: a multi-functional enzyme controlling key steps in viral replication 4. Nidovirus helicases as drug targets 5. Concluding remarks: a long and unwinding road to understanding nidovirus helicases...
Stress, which is closely related to mental health [4] has become an important component of a healthy life for urban inhabitants. The World Health Organisation (WHO) clarified the definition of health in 1947: "Health is a state of complete physical, mental and social well-being and not ...