A hexahedron (plural: hexahedra) is any polyhedron with six faces. A cube, for example, is a regular hexahedron with all its faces square, and three squares around each vertex. There are seven topologically distinct convex hexahedra, one of which exists in two mirror image forms.
Some bacteria that can help the environment are called decomposers. They are nature's recyclers! They return basic chemicals to the environment for living things to reuse! For example, the leaves of many trees die in the Autumn and drop to the ground.ome bacteria that can help the environment are called decomposers. They are nature's recyclers! They return basic chemicals to the environment for living things to reuse! For example, the leaves of many trees die in the Autumn and drop to the ground.
Abstract. Outer membrane vesicles secreted by gram-negative bacteria play an important role in bacterial physiology as well as in virulence and hostâpathogen interaction.Isolated vesicles of some bacteria have also been studied for their immunomodulatory potential in the vaccine development. growing number of gram-negative bacteria has been reported to secrete outer membrane vesicles (OMV) whose functions are frequently involved in the delivery of active substances to a host and/or the modulation of a host immune response; for recent reviews see Amano et al.