Growing degree-day. Growing degree days (GDD), also called growing degree units (GDUs), are a heuristic tool in phenology. GDD are a measure of heat accumulation used by horticulturists, gardeners, and farmers to predict plant and animal development rates such as the date that a flower will bloom, an insect will emerge from dormancy, or a crop will reach maturity.
Cystic fibrosis is a genetic condition caused by a faulty gene (known as the CFTR gene). The CFTR gene normally creates a protein that moves salt and water out of a cell.If the CFTR gene is defective, it results in a build-up of thick, sticky mucus in the body's tubes and passageways.ystic fibrosis is a genetic condition caused by a faulty gene (known as the CFTR gene). The CFTR gene normally creates a protein that moves salt and water out of a cell.
Cystic fibrosis (CF) is a relatively common inherited disease in which from infancy there are recurrent chest infections causing lung damage, intestinal malabsorption leading to severe malnutrition and growth failure, and there is an excess of salt in the sweat.here is a gene on each number 7 chromosome that is responsible for the production of a protein called cystic fibrosis transmembrane regulator (CFTR). Mutations in this gene lead to absent or defective CFTR production, causing CF.