Changes in the skills base and knowledge our students need require new learning goals; these new learning goals change the relationship between assessment and instruction. Teachers need to take an active role in making decisions about the purpose of assessment and the content that is being assessed.
Titanite, or sphene (from the Greek sphenos (ÏÏÎ·Î½Ï), meaning wedge), is a calcium titanium nesosilicate mineral, Ca Ti Si O 5.Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium; calcium may be partly replaced by thorium.ue depends on Fe content, with low Fe content causing green and yellow colours, and high Fe content causing brown or black hues. Zoning is typical in titanite. It is prized for its exceptional dispersive power (0.051, B to G interval) which exceeds that of diamond.
The One Solution Vesphene st System Pre-measured WFI combines a sterile unit dose pouch with a gallon of USP Water For Injection (WFI). The Vesphene products are all made with the same alkaline phenolic formulation, but are processed and packaged differently for specific applications.At a use-dilution rate of 1:128, the Vesphene products kill a broad spectrum of common bacteria without harming the surface.Formulated to maintain an alkaline use-dilution pH of 10.4-10.6, they are ideal for use in a disinfectant rotation program with the LpH Â® acidic family of products.he One Solution Vesphene st System Pre-measured WFI combines a sterile unit dose pouch with a gallon of USP Water For Injection (WFI). The Vesphene products are all made with the same alkaline phenolic formulation, but are processed and packaged differently for specific applications.