Persistent behavior problems canaffect educational attainment, proper social development,employment, and the likelihood of criminality.The causes of childrenâs mental health problems arevaried and complex and include genetic makeup, childpoverty, maternal depression, and poor or abusivecare.
Paper chromatography is a technique for separating and identifying mixtures that are (or can be) coloured. It has been largely replaced by thin layer chromatography, but is still a powerful teaching tool. Double-way paper chromatography, also called 'two-dimensional chromatography', uses two solvents and rotates the paper 90Â° in between.
In flash column chromatography the most commonly used stationary phases are silica gel (SiO2) and alumina (Al2O3). Other stationary phases are available for specific uses (Table 1). Figure 2 shows the general structure of normal phase, reversed phase and specialized silica.