calcium pump. the mechanism of active transport of calcium (Ca 2+) across a membrane, as of the sarcoplasmic reticulum of muscle cells, against a concentration gradient; the mechanism is driven by hydrolysis of ATP.
A rental agreement differs from a lease agreement in that it is not a long-term contract and usually occurs on a month-to-month basis. This month-to-month lease agreement expires and then renews each month upon agreement of the parties involved.
A lease is a contractual arrangement calling for the lessee to pay the lessor for use of an asset. Property, buildings and vehicles are common assets that are leased. Industrial or business equipment is also leased. Broadly put, a lease agreement is a contract between two parties, the lessor and the lessee. The lessor is the legal owner of the asset; the lessee obtains the right to use the asset in return for regular rental payments. The lessee also agrees to abide by various conditions regardin