Trypan Blue Exclusion

Source: Laboratories of Nicholaus Noles and Judith Danovitch—University of Louisville Humans are different from other animals in many ways, but perhaps the most important differentiating factor is their ability to use language. Other animals can communicate and even understand and use language in limited ways, but trying to teach human language to a chimp or a dog takes a great deal of time and effort. In contrast, young humans acquire their native language easily, and they learn linguistic...

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information: The number of the principal quantum shell, n, The letter that designates the orbital type (the subshell, l), and A superscript number that designates the number of electrons in that particular subshell. For example, the notation 2p4 indicates four electrons in a p subshell (l = 1) with a principal...

GDP helps track the value of goods and services sold in the market, but it leaves out many daily things. Some activities, even though useful or meaningful, are not counted because they don’t involve money or are not part of current production.Imagine someone buys wood, nails, and paint to build chairs they plan to sell. These supplies are seen as part of making the final product. Only the money earned from selling the finished chairs is counted in GDP. The materials are not added separately...

In capital budgeting, selecting between mutually exclusive projects means choosing one option from a set of options, as both cannot be pursued simultaneously. This decision significantly impacts the company's future growth and financial health. For example, an automobile company deciding between Project A, which generates $20,000 annually for seven years, and Project B, which generates $30,000 annually for five years, may use the Net Present Value (NPV) method. After discounting future cash...

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly. Silica particles offer advantages such as rigidity,...