Harvest Rate Model. In a perfusion-based process, harvest of cell culture fluid begins significantly before cell density or titer has reached a steady state. After inoculation of the bioreactor, cells grow in batch mode until a specific cell density is achieved, at which point perfusion is initiated at a low HR.
Borax (sodium tetraborate hexahydrate or sodium borate) is a naturally-occurring mineral composed of sodium, boron, oxygen and water. It has been used as a remedy for over 4000 years. Most commercially-produced borax is mined from deposits produced by the repeated evaporation of seasonal lakes. It is found in large quantities in the Western United States, in Mediterranean countries, Kazakhstan, and the Tibet region of China. Turkey is one of the largest commercial producers of borates.
Borax, of the mule team variety, is sodium tetraborate or sodium borate (to get all official for a second) and NOT boric acid (hydrogen borate), which is a common misconception on the interwebs apparently.odium Tetraborate (hereafter referred to as Borax) is a salt of boric acid but it is not chemically the same as boric acid. If youâve read an article claiming borax is dangerous that goes on about the dangers of boric acid or says they are the same thing, I would not consider that article credible.