The precise code of the GPS signal typically used only by the U.S. military. It is encrypted and reset every seven days to prevent use from unauthorized persons.
2.
PACE
Purchase of agricultural conservation easements, i.e. PACE programs pay farmers to keep their land available for agriculture. Landowners sell an agricultural conservation easement to a qualified government agency or private conservation organization. Landowners retain full ownership and use of their land for agricultural purposes, PACE programs do not give government agencies the right to develop land. Development rights are extinguished in exchange for compensation. PACE is also known as purchase of development rights (PDR) and as agricultural preservation restriction (APR) in Massachusetts.
3.
Palea
Upper bract that with the lemma encloses the flower in grasses. (See 'Glumes').
4.
Palea
One of the thin bracts of a grass floret enclosing the caryopsis which is located on the side opposite the embryo.
5.
Palea
The upper (inner) bract of a grass floret, sometimes called the inner or upper palea. Bract enclosing the caryopsis on the inner ventral side.
6.
Paleolithic
The human cultural and technological phase characterized by the use of stone tools, before the widespread use of metal. In some regions this was followed by the Neolithic phase with abundant polished stone tools.
7.
Palisade layer
The layer of elongated cells just below the epidermis.
8.
Palisade layer
In seeds this term is used interchangeably with malpighian layer.
9.
Pallet box
Box in which seeds are placed for handling during processing and that is moved by forklift. (See 'Totebox').
10.
Palmate
Describing a compound leaf that has the appearance of an outspread hand.
