PHP â Sort Functions For Arrays. In this chapter, we will go through the following PHP array sort functions: sort() â sort arrays in ascending order. rsort() â sort arrays in descending order. asort() â sort associative arrays in ascending order, according to the value.
Environmental factors that can affect gene expression. Exposing a fetus, infant, or child to a chemical or nutritional (or other) stressor during development can affect the risk of disease development even into adulthood. The mechanisms involved are probably epigenetics (Boekelheide et al. 2012).
Gene expression relates to which genes are transcribed and at what rates they are transcribed. Housekeeping genes are expressed at approximately equivalent levels in all cells. Inducible genes can be turned on or turned off, depending on the conditions in the cell and the cell type.