Subpopulations of cortical GABAergic inter - neurons differ by their expression of D1 and D2 dopamin

A solar collector for heating a fluid, e.g., air or water, is provided with at least one glass plate and an infrared reflector plate mounted about a solar and infrared energy absorber to provide fluid heating compartments. Facilities are provided for moving the fluid through the heating compartments to efficiently utilize the solar and infrared energy to heat the fluid. Other embodiments of solar collectors are taught for efficiently heating the fluid by increasing the fluid path to optimize the use of solar and infrared energy.