Abstract: Disclosed herein are to isolated polynucleotide sequences encoding modified phytochrome polypeptides wherein the modified phytochrome polypeptide has at least one of an altered thermal reversion rate, an altered photoconversion rate, an altered absorption spectrum, or an altered signal output compared to the unmodified phytochrome polypeptide. Also disclosed are transgenic plants comprising said modified phytochrome polypeptides and methods of producing said transgenic plants.

Abstract: A portable and modular shielding system having various modular wall components that can be interconnect to form a custom designed wall configuration, wherein the resulting wall provides shielding from radiation at its joints of two adjacent modular wall components as well as along its entire length. The principal modular wall component has a main container being generally rectangular in shape and a connector container being an elongated cylinder having a cross section that is generally circular in shape and being integrally connected to the second end of the main container. The first end of the main container is concave in shape and adapted to correspond to the generally circular shape of the connector container. A shielding wall is formed by interconnecting a connector container of a first modular wall component into a first end of a second modular wall component. The main container and connector container are hollow and are adapted to be filled with a filler material.